mirror of
https://github.com/ToshioCP/Gtk4-tutorial.git
synced 2025-01-12 20:03:28 +01:00
Section 30 is added. It is about GtkSignalListItemFactory.
This commit is contained in:
Toshio Sekiya
parent
ae15d4abbd
commit
95320ca6fb
17 changed files with 1652 additions and 6 deletions
|
|
@ -82,3 +82,4 @@ There is a document \("[How to build GTK 4 Tutorial](gfm/Readme_for_developers.m
|
|||
1. [GtkGridView and activate signal](gfm/sec27.md)
|
||||
1. [GtkExpression](gfm/sec28.md)
|
||||
1. [GtkColumnView](gfm/sec29.md)
|
||||
1. [GtkSignalListItemFactory](gfm/sec30.md)
|
||||
|
|
|
|||
BIN
docs/image/listeditor.png
Normal file
BIN
docs/image/listeditor.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 23 KiB |
|
|
@ -190,6 +190,7 @@ gsettings</a></li>
|
|||
<li><a href="sec27.html">GtkGridView and activate signal</a></li>
|
||||
<li><a href="sec28.html">GtkExpression</a></li>
|
||||
<li><a href="sec29.html">GtkColumnView</a></li>
|
||||
<li><a href="sec30.html">GtkSignalListItemFactory</a></li>
|
||||
</ol>
|
||||
<p>This website uses <a
|
||||
href="https://getbootstrap.jp/">Bootstrap</a>.</p>
|
||||
|
|
|
|||
|
|
@ -820,7 +820,7 @@ class="sourceCode numberSource C numberLines"><code class="sourceCode c"><span i
|
|||
<span id="cb13-10"><a href="#cb13-10"></a> GtkCssProvider <span class="op">*</span>provider<span class="op">;</span></span>
|
||||
<span id="cb13-11"><a href="#cb13-11"></a><span class="op">};</span></span>
|
||||
<span id="cb13-12"><a href="#cb13-12"></a></span>
|
||||
<span id="cb13-13"><a href="#cb13-13"></a>G_DEFINE_TYPE <span class="op">(</span>TfeApplication<span class="op">,</span> tfe_application<span class="op">,</span> GTK_TYPE_APPLICATION<span class="op">);</span></span>
|
||||
<span id="cb13-13"><a href="#cb13-13"></a>G_DEFINE_TYPE <span class="op">(</span>TfeApplication<span class="op">,</span> tfe_application<span class="op">,</span> GTK_TYPE_APPLICATION<span class="op">)</span></span>
|
||||
<span id="cb13-14"><a href="#cb13-14"></a></span>
|
||||
<span id="cb13-15"><a href="#cb13-15"></a><span class="co">/* gsettings changed::font signal handler */</span></span>
|
||||
<span id="cb13-16"><a href="#cb13-16"></a><span class="dt">static</span> <span class="dt">void</span></span>
|
||||
|
|
|
|||
|
|
@ -103,7 +103,10 @@
|
|||
<a class="nav-link" href="sec28.html">Prev: section28</a>
|
||||
</li>
|
||||
|
||||
|
||||
<li class="nav-item">
|
||||
<a class="nav-link" href="sec30.html">Next: section30</a>
|
||||
</li>
|
||||
|
||||
</ul>
|
||||
</div>
|
||||
</div>
|
||||
|
|
|
|||
429
docs/sec30.html
Normal file
429
docs/sec30.html
Normal file
|
|
@ -0,0 +1,429 @@
|
|||
<!DOCTYPE html>
|
||||
<html lang="en">
|
||||
<head>
|
||||
<meta charset="utf-8" />
|
||||
<meta name="generator" content="pandoc" />
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1" />
|
||||
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
|
||||
<title>GTK 4 tutorial</title>
|
||||
<style>
|
||||
code{white-space: pre-wrap;}
|
||||
span.smallcaps{font-variant: small-caps;}
|
||||
span.underline{text-decoration: underline;}
|
||||
div.column{display: inline-block; vertical-align: top; width: 50%;}
|
||||
div.hanging-indent{margin-left: 1.5em; text-indent: -1.5em;}
|
||||
ul.task-list{list-style: none;}
|
||||
pre{overflow: visible;}
|
||||
pre > code.sourceCode { white-space: pre; position: relative; }
|
||||
pre > code.sourceCode > span { display: inline-block; line-height: 1.25; }
|
||||
pre > code.sourceCode > span:empty { height: 1.2em; }
|
||||
code.sourceCode > span { color: inherit; text-decoration: inherit; }
|
||||
div.sourceCode { margin: 1em 0; }
|
||||
pre.sourceCode { margin: 0; }
|
||||
@media screen {
|
||||
div.sourceCode { overflow: auto; }
|
||||
}
|
||||
@media print {
|
||||
pre > code.sourceCode { white-space: pre-wrap; }
|
||||
pre > code.sourceCode > span { text-indent: -5em; padding-left: 5em; }
|
||||
}
|
||||
pre.numberSource code
|
||||
{ counter-reset: source-line 0; }
|
||||
pre.numberSource code > span
|
||||
{ position: relative; left: -4em; counter-increment: source-line; }
|
||||
pre.numberSource code > span > a:first-child::after
|
||||
{ content: counter(source-line);
|
||||
position: relative; left: -1em; text-align: right; vertical-align: baseline;
|
||||
border: none; display: inline-block;
|
||||
-webkit-touch-callout: none; -webkit-user-select: none;
|
||||
-khtml-user-select: none; -moz-user-select: none;
|
||||
-ms-user-select: none; user-select: none;
|
||||
padding: 0 4px; width: 4em;
|
||||
color: #aaaaaa;
|
||||
}
|
||||
pre.numberSource { margin-left: 3em; border-left: 1px solid #aaaaaa; padding-left: 4px; }
|
||||
div.sourceCode
|
||||
{ }
|
||||
@media screen {
|
||||
pre > code.sourceCode > span > a:first-child::before { text-decoration: underline; }
|
||||
}
|
||||
code span.al { color: #ff0000; font-weight: bold; } /* Alert */
|
||||
code span.an { color: #60a0b0; font-weight: bold; font-style: italic; } /* Annotation */
|
||||
code span.at { color: #7d9029; } /* Attribute */
|
||||
code span.bn { color: #40a070; } /* BaseN */
|
||||
code span.bu { } /* BuiltIn */
|
||||
code span.cf { color: #007020; font-weight: bold; } /* ControlFlow */
|
||||
code span.ch { color: #4070a0; } /* Char */
|
||||
code span.cn { color: #880000; } /* Constant */
|
||||
code span.co { color: #60a0b0; font-style: italic; } /* Comment */
|
||||
code span.cv { color: #60a0b0; font-weight: bold; font-style: italic; } /* CommentVar */
|
||||
code span.do { color: #ba2121; font-style: italic; } /* Documentation */
|
||||
code span.dt { color: #902000; } /* DataType */
|
||||
code span.dv { color: #40a070; } /* DecVal */
|
||||
code span.er { color: #ff0000; font-weight: bold; } /* Error */
|
||||
code span.ex { } /* Extension */
|
||||
code span.fl { color: #40a070; } /* Float */
|
||||
code span.fu { color: #06287e; } /* Function */
|
||||
code span.im { } /* Import */
|
||||
code span.in { color: #60a0b0; font-weight: bold; font-style: italic; } /* Information */
|
||||
code span.kw { color: #007020; font-weight: bold; } /* Keyword */
|
||||
code span.op { color: #666666; } /* Operator */
|
||||
code span.ot { color: #007020; } /* Other */
|
||||
code span.pp { color: #bc7a00; } /* Preprocessor */
|
||||
code span.sc { color: #4070a0; } /* SpecialChar */
|
||||
code span.ss { color: #bb6688; } /* SpecialString */
|
||||
code span.st { color: #4070a0; } /* String */
|
||||
code span.va { color: #19177c; } /* Variable */
|
||||
code span.vs { color: #4070a0; } /* VerbatimString */
|
||||
code span.wa { color: #60a0b0; font-weight: bold; font-style: italic; } /* Warning */
|
||||
div.sourceCode { margin: 10px; padding: 16px 10px 8px 10px; border: 2px solid silver; background-color: ghostwhite; overflow-x:scroll}
|
||||
pre:not(.sourceCode) { margin: 10px; padding: 16px 10px 8px 10px; border: 2px solid silver; background-color: ghostwhite; overflow-x:scroll}
|
||||
table {margin-left: auto; margin-right: auto; border-collapse: collapse; border: 1px solid;}
|
||||
th {padding: 2px 6px; border: 1px solid; background-color: ghostwhite;}
|
||||
td {padding: 2px 6px; border: 1px solid;}
|
||||
img {display: block; margin-left: auto; margin-right: auto;}
|
||||
figcaption {text-align: center;}
|
||||
</style>
|
||||
</head>
|
||||
<body style="padding-top: 70px;">
|
||||
<div class="container">
|
||||
<nav class="navbar fixed-top navbar-expand-lg navbar-dark bg-primary">
|
||||
<div class="container-fluid">
|
||||
<span class="navbar-brand">Gtk4 tutorial</span>
|
||||
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
|
||||
<span class="navbar-toggler-icon"></span>
|
||||
</button>
|
||||
<div class="collapse navbar-collapse" id="navbarSupportedContent">
|
||||
<ul class="navbar-nav me-auto mb-2 mb-lg-0">
|
||||
<li class="nav-item">
|
||||
<a class="nav-link" href="index.html">Home</a>
|
||||
</li>
|
||||
|
||||
<li class="nav-item">
|
||||
<a class="nav-link" href="sec29.html">Prev: section29</a>
|
||||
</li>
|
||||
|
||||
|
||||
</ul>
|
||||
</div>
|
||||
</div>
|
||||
</nav>
|
||||
<h1 id="gtksignallistitemfactory">GtkSignalListItemFactory</h1>
|
||||
<h2
|
||||
id="gtksignallistitemfactory-and-gtkbulderlistitemfactory">GtkSignalListItemFactory
|
||||
and GtkBulderListItemFactory</h2>
|
||||
<p>GtkBuilderlistItemFactory is convenient when GtkListView just shows
|
||||
the contents of a list. Its binding direction is always from an item of
|
||||
a list to a child of GtkListItem.</p>
|
||||
<p>When it comes to dynamic connection, it’s not enough. For example,
|
||||
you want to edit the contents of a list. You set a child of GtkListItem
|
||||
to a GtkText instance so a user can edit a text with it. You need to
|
||||
bind an item in the list with the buffer of the GtkText. The direction
|
||||
is opposite from the one with GtkBuilderListItemFactory. It is from the
|
||||
GtkText instance to the item in the list. You can implement this with
|
||||
GtkSignalListItemFactory, which is more flexible than
|
||||
GtkBuilderListItemFactory.</p>
|
||||
<p>Two things are shown in this section.</p>
|
||||
<ul>
|
||||
<li>Binding from a child of a GtkListItem instance to an item of a
|
||||
list.</li>
|
||||
<li>Access a child of GtkListItem dynamically. This direction is the
|
||||
same as the one with GtkBulderListItemFactory. But
|
||||
GtkBulderListItemFactory uses GtkExpression from the item property of
|
||||
the GtkListItem. So, it updates its child widget only when the item
|
||||
property changes. In this example the child reflects the change in the
|
||||
same item in the list dynamically.</li>
|
||||
</ul>
|
||||
<p>This section shows just a part of the source file
|
||||
<code>listeditor.c</code>. If you want to see the whole codes, see
|
||||
<code>src/listeditor</code> directory of the <a
|
||||
href="https://github.com/ToshioCP/Gtk4-tutorial">Gtk4 tutorial
|
||||
repository</a>.</p>
|
||||
<h2 id="a-list-editor">A list editor</h2>
|
||||
<p>The sample program is a list editor and data of the list are strings.
|
||||
It’s the same as a line editor. It reads a text file line by line. Each
|
||||
line is an item of the list. The list is displayed with GtkColumnView.
|
||||
There are two columns. The one is a button, which makes the line be a
|
||||
current line. If the line is the current line, the button is colored
|
||||
with red. The other is a string which is the contents of the
|
||||
corresponding item of the list.</p>
|
||||
<figure>
|
||||
<img src="image/listeditor.png" alt="List editor" />
|
||||
<figcaption aria-hidden="true">List editor</figcaption>
|
||||
</figure>
|
||||
<p>The source files are located at <code>src/listeditor</code>
|
||||
directory. You can compile end execute it as follows.</p>
|
||||
<ul>
|
||||
<li>Download the program from the <a
|
||||
href="https://github.com/ToshioCP/Gtk4-tutorial">repository</a>.</li>
|
||||
<li>Change your current directory to <code>src/listeditor</code>.</li>
|
||||
<li>Type the following on your commandline.</li>
|
||||
</ul>
|
||||
<pre><code>$ meson _build
|
||||
$ ninja -C _build
|
||||
$ _build/listeditor</code></pre>
|
||||
<ul>
|
||||
<li>Append button: appends a line after the current line, or at the last
|
||||
line if no current line exists.</li>
|
||||
<li>Insert button: inserts a line before the current line.</li>
|
||||
<li>Remove button: removes a current line.</li>
|
||||
<li>Read button: reads a file.</li>
|
||||
<li>Write button: writes the contents to a file.</li>
|
||||
<li>close button: close the contents.</li>
|
||||
<li>quit button: quit the application.</li>
|
||||
<li>Button on the select column: makes the line current.</li>
|
||||
<li>String column: GtkText. You can edit a string in the field.</li>
|
||||
</ul>
|
||||
<p>The current line number (zero-based) is shown at the left of the tool
|
||||
bar. The file name is shown at the right of the write button.</p>
|
||||
<h2 id="connect-a-gtktext-instance-and-an-item-in-the-list">Connect a
|
||||
GtkText instance and an item in the list</h2>
|
||||
<p>The second column (GtkColumnViewColumn) sets its factory property to
|
||||
GtkSignalListItemFactory. It uses three signals setup, bind and unbind.
|
||||
The following is their sgnal handlers.</p>
|
||||
<div class="sourceCode" id="cb2"><pre
|
||||
class="sourceCode numberSource C numberLines"><code class="sourceCode c"><span id="cb2-1"><a href="#cb2-1"></a><span class="dt">static</span> <span class="dt">void</span></span>
|
||||
<span id="cb2-2"><a href="#cb2-2"></a>setup2_cb <span class="op">(</span>GtkListItemFactory <span class="op">*</span>factory<span class="op">,</span> GtkListItem <span class="op">*</span>listitem<span class="op">)</span> <span class="op">{</span></span>
|
||||
<span id="cb2-3"><a href="#cb2-3"></a> GtkWidget <span class="op">*</span>text <span class="op">=</span> gtk_text_new <span class="op">();</span></span>
|
||||
<span id="cb2-4"><a href="#cb2-4"></a> gtk_list_item_set_child <span class="op">(</span>listitem<span class="op">,</span> GTK_WIDGET <span class="op">(</span>text<span class="op">));</span></span>
|
||||
<span id="cb2-5"><a href="#cb2-5"></a><span class="op">}</span></span>
|
||||
<span id="cb2-6"><a href="#cb2-6"></a></span>
|
||||
<span id="cb2-7"><a href="#cb2-7"></a><span class="dt">static</span> <span class="dt">void</span></span>
|
||||
<span id="cb2-8"><a href="#cb2-8"></a>bind2_cb <span class="op">(</span>GtkListItemFactory <span class="op">*</span>factory<span class="op">,</span> GtkListItem <span class="op">*</span>listitem<span class="op">)</span> <span class="op">{</span></span>
|
||||
<span id="cb2-9"><a href="#cb2-9"></a> GtkWidget <span class="op">*</span>text <span class="op">=</span> gtk_list_item_get_child <span class="op">(</span>listitem<span class="op">);</span></span>
|
||||
<span id="cb2-10"><a href="#cb2-10"></a> LeData <span class="op">*</span>data <span class="op">=</span> LE_DATA <span class="op">(</span>gtk_list_item_get_item <span class="op">(</span>listitem<span class="op">));</span></span>
|
||||
<span id="cb2-11"><a href="#cb2-11"></a> GtkEntryBuffer <span class="op">*</span>buffer<span class="op">;</span></span>
|
||||
<span id="cb2-12"><a href="#cb2-12"></a> GBinding <span class="op">*</span>bind<span class="op">;</span></span>
|
||||
<span id="cb2-13"><a href="#cb2-13"></a></span>
|
||||
<span id="cb2-14"><a href="#cb2-14"></a> buffer <span class="op">=</span> gtk_text_get_buffer <span class="op">(</span>GTK_TEXT <span class="op">(</span>text<span class="op">));</span></span>
|
||||
<span id="cb2-15"><a href="#cb2-15"></a> gtk_entry_buffer_set_text <span class="op">(</span>buffer<span class="op">,</span> le_data_look_string <span class="op">(</span>data<span class="op">),</span> <span class="op">-</span><span class="dv">1</span><span class="op">);</span></span>
|
||||
<span id="cb2-16"><a href="#cb2-16"></a> bind <span class="op">=</span> g_object_bind_property <span class="op">(</span>buffer<span class="op">,</span> <span class="st">"text"</span><span class="op">,</span> data<span class="op">,</span> <span class="st">"string"</span><span class="op">,</span> G_BINDING_DEFAULT<span class="op">);</span></span>
|
||||
<span id="cb2-17"><a href="#cb2-17"></a> g_object_set_data <span class="op">(</span>G_OBJECT <span class="op">(</span>listitem<span class="op">),</span> <span class="st">"bind"</span><span class="op">,</span> bind<span class="op">);</span></span>
|
||||
<span id="cb2-18"><a href="#cb2-18"></a><span class="op">}</span></span>
|
||||
<span id="cb2-19"><a href="#cb2-19"></a></span>
|
||||
<span id="cb2-20"><a href="#cb2-20"></a><span class="dt">static</span> <span class="dt">void</span></span>
|
||||
<span id="cb2-21"><a href="#cb2-21"></a>unbind2_cb <span class="op">(</span>GtkListItemFactory <span class="op">*</span>factory<span class="op">,</span> GtkListItem <span class="op">*</span>listitem<span class="op">)</span> <span class="op">{</span></span>
|
||||
<span id="cb2-22"><a href="#cb2-22"></a> GBinding <span class="op">*</span>bind <span class="op">=</span> G_BINDING <span class="op">(</span>g_object_get_data <span class="op">(</span>G_OBJECT <span class="op">(</span>listitem<span class="op">),</span> <span class="st">"bind"</span><span class="op">));</span></span>
|
||||
<span id="cb2-23"><a href="#cb2-23"></a></span>
|
||||
<span id="cb2-24"><a href="#cb2-24"></a> g_binding_unbind<span class="op">(</span>bind<span class="op">);</span></span>
|
||||
<span id="cb2-25"><a href="#cb2-25"></a> g_object_set_data <span class="op">(</span>G_OBJECT <span class="op">(</span>listitem<span class="op">),</span> <span class="st">"bind"</span><span class="op">,</span> NULL<span class="op">);</span></span>
|
||||
<span id="cb2-26"><a href="#cb2-26"></a><span class="op">}</span></span></code></pre></div>
|
||||
<ul>
|
||||
<li>1-5: <code>setup2_cb</code> is a setup signal handler on the
|
||||
GtkSignalListItemFactory. This factory is inserted to the factory
|
||||
property of the second GtkColumnViewColumn. Te handler just creates a
|
||||
GtkText instance and sets the child of <code>listitem</code> to it. The
|
||||
instance will be destroyed automatically when the <code>listitem</code>
|
||||
is destroyed. So, teardown signal handler isn’t necessary.</li>
|
||||
<li>7-18: <code>bind2_cb</code> is a bind signal handler. It is called
|
||||
when the <code>listitem</code> is bound to an item in the list. The list
|
||||
items are LeData instances. LeData is defined in the file
|
||||
<code>listeditor.c</code> (the C source file of the list editor). It is
|
||||
a child class of GObject and has two data. The one is
|
||||
<code>listitem</code> which points a GtkListItem instance when they are
|
||||
connected. If no GtkListItem is connected, it is NULL. The other is
|
||||
<code>string</code> which is a content of the line.
|
||||
<ul>
|
||||
<li>9-10: <code>text</code> is a child of the <code>listitem</code> and
|
||||
it is a GtkText instance. <code>data</code> is an item pointed by the
|
||||
<code>listitem</code>. It is a LeData instance.</li>
|
||||
<li>14: Gets the buffer of the <code>text</code>.</li>
|
||||
<li>15: Sets the text of the buffer to
|
||||
<code>le_data_look_string (data)</code>. le_data_look_string returns the
|
||||
string of the data and the ownership of the string is taken by the
|
||||
<code>data</code>. So, the caller don’t need to free the string.</li>
|
||||
<li>16: <code>g_object_bind_property</code> binds a property and another
|
||||
object property. This line binds the “text” property of the
|
||||
<code>buffer</code> (source) and the “string” property of the
|
||||
<code>data</code> (destination). It is a uni-directional binding
|
||||
(<code>G_BINDING_DEFAULT</code>). When a user changes the GtkText text,
|
||||
the same string is immediately put into the <code>data</code>. The
|
||||
function returns a GBinding instance. This binding is different from
|
||||
bindings of GtkExpression. This binding needs the existence of the two
|
||||
properties.</li>
|
||||
<li>17: GObjec has a table. The key is a string (or GQuark) and the
|
||||
value is a gpointer (pointer to any type). The function
|
||||
<code>g_object_set_data</code> sets the association from the key to the
|
||||
value. This line sets the association from “bind” to <code>bind</code>
|
||||
instance on the <code>listitem</code> instance. It makes possible for
|
||||
the “unbind” handler to get the <code>bind</code> instance.</li>
|
||||
</ul></li>
|
||||
<li>20-26: <code>unbind2_cb</code> is a unbind signal handler.
|
||||
<ul>
|
||||
<li>22: Retrieves the <code>bind</code> instance from the table in the
|
||||
<code>listitem</code> instance.</li>
|
||||
<li>24: Unbind the binding.</li>
|
||||
<li>25: Removes the value corresponds to the “bind” key.</li>
|
||||
</ul></li>
|
||||
</ul>
|
||||
<p>This technique is not so complicated. You can use it when you make a
|
||||
cell editable application.</p>
|
||||
<h2 id="change-the-cell-of-gtkcolumnview-dynamically">Change the cell of
|
||||
GtkColumnView dynamically</h2>
|
||||
<p>Next topic is to change the GtkColumnView (or GtkListView) cells
|
||||
dynamically. The example changes the color of the buttons, which are
|
||||
children of GtkListItem instances, as the current line position
|
||||
moves.</p>
|
||||
<p>The line editor has the current position of the list.</p>
|
||||
<ul>
|
||||
<li>At first, no line is current.</li>
|
||||
<li>When a line is appended or inserted, the line is current.</li>
|
||||
<li>When the current line is deleted, no line will be current.</li>
|
||||
<li>When a button in the first column of GtkColumnView is clicked, the
|
||||
line will be current.</li>
|
||||
</ul>
|
||||
<p>The button of the current line is colored with red and otherwise
|
||||
white.</p>
|
||||
<p>The current line has no relationship to GtkSingleSelection object.
|
||||
GtkSingleSelection selects a line on the display. The current line
|
||||
doesn’t need to be on the display. It is possible to be on the line out
|
||||
of the Window (GtkScrolledWindow). Actually, the program doesn’t use
|
||||
GtkSingleSelection.</p>
|
||||
<p>It is necessary to know the corresponding GtkListItem instance from
|
||||
the item in the list. It is the opposite direction from
|
||||
<code>gtk_list_item_get_item</code> function. To accomplish this, we set
|
||||
a <code>listitem</code> element of LeData to point the corresponding
|
||||
GtkListItem instance. Therefore, items (LeData) in the list always know
|
||||
the GtkListItem. If there’s no GtkListItem binded to the item, NULL is
|
||||
assigned.</p>
|
||||
<div class="sourceCode" id="cb3"><pre
|
||||
class="sourceCode numberSource C numberLines"><code class="sourceCode c"><span id="cb3-1"><a href="#cb3-1"></a><span class="dt">void</span></span>
|
||||
<span id="cb3-2"><a href="#cb3-2"></a>select_cb <span class="op">(</span>GtkButton <span class="op">*</span>btn<span class="op">,</span> GtkListItem <span class="op">*</span>listitem<span class="op">)</span> <span class="op">{</span></span>
|
||||
<span id="cb3-3"><a href="#cb3-3"></a> LeWindow <span class="op">*</span>win <span class="op">=</span> LE_WINDOW <span class="op">(</span>gtk_widget_get_ancestor <span class="op">(</span>GTK_WIDGET <span class="op">(</span>btn<span class="op">),</span> LE_TYPE_WINDOW<span class="op">));</span></span>
|
||||
<span id="cb3-4"><a href="#cb3-4"></a></span>
|
||||
<span id="cb3-5"><a href="#cb3-5"></a> update_current <span class="op">(</span>win<span class="op">,</span> gtk_list_item_get_position <span class="op">(</span>listitem<span class="op">));</span></span>
|
||||
<span id="cb3-6"><a href="#cb3-6"></a><span class="op">}</span></span>
|
||||
<span id="cb3-7"><a href="#cb3-7"></a></span>
|
||||
<span id="cb3-8"><a href="#cb3-8"></a><span class="dt">static</span> <span class="dt">void</span></span>
|
||||
<span id="cb3-9"><a href="#cb3-9"></a>setup1_cb <span class="op">(</span>GtkListItemFactory <span class="op">*</span>factory<span class="op">,</span> GtkListItem <span class="op">*</span>listitem<span class="op">)</span> <span class="op">{</span></span>
|
||||
<span id="cb3-10"><a href="#cb3-10"></a> GtkWidget <span class="op">*</span>button <span class="op">=</span> gtk_button_new <span class="op">();</span></span>
|
||||
<span id="cb3-11"><a href="#cb3-11"></a> gtk_list_item_set_child <span class="op">(</span>listitem<span class="op">,</span> button<span class="op">);</span></span>
|
||||
<span id="cb3-12"><a href="#cb3-12"></a> g_signal_connect <span class="op">(</span>button<span class="op">,</span> <span class="st">"clicked"</span><span class="op">,</span> G_CALLBACK <span class="op">(</span>select_cb<span class="op">),</span> listitem<span class="op">);</span></span>
|
||||
<span id="cb3-13"><a href="#cb3-13"></a><span class="op">}</span></span>
|
||||
<span id="cb3-14"><a href="#cb3-14"></a></span>
|
||||
<span id="cb3-15"><a href="#cb3-15"></a><span class="dt">static</span> <span class="dt">void</span></span>
|
||||
<span id="cb3-16"><a href="#cb3-16"></a>bind1_cb <span class="op">(</span>GtkListItemFactory <span class="op">*</span>factory<span class="op">,</span> GtkListItem <span class="op">*</span>listitem<span class="op">)</span> <span class="op">{</span></span>
|
||||
<span id="cb3-17"><a href="#cb3-17"></a> LeData <span class="op">*</span>data <span class="op">=</span> LE_DATA <span class="op">(</span>gtk_list_item_get_item <span class="op">(</span>listitem<span class="op">));</span></span>
|
||||
<span id="cb3-18"><a href="#cb3-18"></a> <span class="cf">if</span> <span class="op">(</span>data<span class="op">)</span></span>
|
||||
<span id="cb3-19"><a href="#cb3-19"></a> le_data_set_listitem <span class="op">(</span>data<span class="op">,</span> listitem<span class="op">);</span></span>
|
||||
<span id="cb3-20"><a href="#cb3-20"></a><span class="op">}</span></span>
|
||||
<span id="cb3-21"><a href="#cb3-21"></a></span>
|
||||
<span id="cb3-22"><a href="#cb3-22"></a><span class="dt">static</span> <span class="dt">void</span></span>
|
||||
<span id="cb3-23"><a href="#cb3-23"></a>unbind1_cb <span class="op">(</span>GtkListItemFactory <span class="op">*</span>factory<span class="op">,</span> GtkListItem <span class="op">*</span>listitem<span class="op">)</span> <span class="op">{</span></span>
|
||||
<span id="cb3-24"><a href="#cb3-24"></a> LeData <span class="op">*</span>data <span class="op">=</span> LE_DATA <span class="op">(</span>gtk_list_item_get_item <span class="op">(</span>listitem<span class="op">));</span></span>
|
||||
<span id="cb3-25"><a href="#cb3-25"></a> <span class="cf">if</span> <span class="op">(</span>data<span class="op">)</span></span>
|
||||
<span id="cb3-26"><a href="#cb3-26"></a> le_data_set_listitem <span class="op">(</span>data<span class="op">,</span> NULL<span class="op">);</span></span>
|
||||
<span id="cb3-27"><a href="#cb3-27"></a><span class="op">}</span></span></code></pre></div>
|
||||
<ul>
|
||||
<li>8-13: <code>setup1_cb</code> is a setup signal handler on the
|
||||
GtkSignalListItemFactory. This factory is inserted to the factory
|
||||
property of the first GtkColumnViewColumn. It sets the child of
|
||||
<code>listitem</code> to a newly created GtkButton instance. The
|
||||
“clicked” signal on the button is connected to the handler
|
||||
<code>select_cb</code>. When the listitem is destroyed, the child
|
||||
(GtkButton) is also destroyed. At the same time, the connection of the
|
||||
signal and handler is also destroyed. So, you don’t need teardown signal
|
||||
handler.</li>
|
||||
<li>1-6: <code>select_cb</code> is a “clicked” signal handler. LeWindow
|
||||
is defined in <code>listeditor.c</code>. It’s a child class of
|
||||
GtkApplicationWindow. The handler just calls the
|
||||
<code>update_current</code> function. The function will be explained
|
||||
later.</li>
|
||||
<li>15-20: <code>bind1_cb</code> is a bind signal handler. It sets the
|
||||
“listitem” element of the item (LeData) to point the
|
||||
<code>listitem</code> (GtkListItem instance). It makes the item possible
|
||||
to find the corresponding GtkListItem instance.</li>
|
||||
<li>22-27: <code>unbind1_cb</code> is an unbind signal handler. It
|
||||
removes the <code>listitem</code> instance from the “listitem” element
|
||||
of the item. The element becomes NULL, which tells no GtkListItem is
|
||||
bound. When referring GtkListItem, it needs to check the “listitem”
|
||||
element whether it points a GtkListItem or not (NULL). Otherwise bad
|
||||
things will happen.</li>
|
||||
</ul>
|
||||
<div class="sourceCode" id="cb4"><pre
|
||||
class="sourceCode numberSource C numberLines"><code class="sourceCode c"><span id="cb4-1"><a href="#cb4-1"></a><span class="dt">static</span> <span class="dt">void</span></span>
|
||||
<span id="cb4-2"><a href="#cb4-2"></a>update_current <span class="op">(</span>LeWindow <span class="op">*</span>win<span class="op">,</span> <span class="dt">int</span> new<span class="op">)</span> <span class="op">{</span></span>
|
||||
<span id="cb4-3"><a href="#cb4-3"></a> <span class="dt">char</span> <span class="op">*</span>s<span class="op">;</span></span>
|
||||
<span id="cb4-4"><a href="#cb4-4"></a> LeData <span class="op">*</span>data<span class="op">;</span></span>
|
||||
<span id="cb4-5"><a href="#cb4-5"></a> GtkListItem <span class="op">*</span>listitem<span class="op">;</span></span>
|
||||
<span id="cb4-6"><a href="#cb4-6"></a> GtkButton <span class="op">*</span>button<span class="op">;</span></span>
|
||||
<span id="cb4-7"><a href="#cb4-7"></a> <span class="dt">const</span> <span class="dt">char</span> <span class="op">*</span>non_current<span class="op">[</span><span class="dv">1</span><span class="op">]</span> <span class="op">=</span> <span class="op">{</span>NULL<span class="op">};</span></span>
|
||||
<span id="cb4-8"><a href="#cb4-8"></a> <span class="dt">const</span> <span class="dt">char</span> <span class="op">*</span>current<span class="op">[</span><span class="dv">2</span><span class="op">]</span> <span class="op">=</span> <span class="op">{</span><span class="st">"current"</span><span class="op">,</span> NULL<span class="op">};</span></span>
|
||||
<span id="cb4-9"><a href="#cb4-9"></a></span>
|
||||
<span id="cb4-10"><a href="#cb4-10"></a> <span class="cf">if</span> <span class="op">(</span>new <span class="op">>=</span> <span class="dv">0</span><span class="op">)</span></span>
|
||||
<span id="cb4-11"><a href="#cb4-11"></a> s <span class="op">=</span> g_strdup_printf <span class="op">(</span><span class="st">"%d"</span><span class="op">,</span> new<span class="op">);</span></span>
|
||||
<span id="cb4-12"><a href="#cb4-12"></a> <span class="cf">else</span></span>
|
||||
<span id="cb4-13"><a href="#cb4-13"></a> s <span class="op">=</span> <span class="st">""</span><span class="op">;</span></span>
|
||||
<span id="cb4-14"><a href="#cb4-14"></a> gtk_label_set_text <span class="op">(</span>GTK_LABEL <span class="op">(</span>win<span class="op">-></span>position_label<span class="op">),</span> s<span class="op">);</span></span>
|
||||
<span id="cb4-15"><a href="#cb4-15"></a> <span class="cf">if</span> <span class="op">(*</span>s<span class="op">)</span> <span class="co">// s isn't an empty string</span></span>
|
||||
<span id="cb4-16"><a href="#cb4-16"></a> g_free <span class="op">(</span>s<span class="op">);</span></span>
|
||||
<span id="cb4-17"><a href="#cb4-17"></a></span>
|
||||
<span id="cb4-18"><a href="#cb4-18"></a> <span class="cf">if</span> <span class="op">(</span>win<span class="op">-></span>position <span class="op">>=</span><span class="dv">0</span><span class="op">)</span> <span class="op">{</span></span>
|
||||
<span id="cb4-19"><a href="#cb4-19"></a> data <span class="op">=</span> LE_DATA <span class="op">(</span>g_list_model_get_item <span class="op">(</span>G_LIST_MODEL <span class="op">(</span>win<span class="op">-></span>liststore<span class="op">),</span> win<span class="op">-></span>position<span class="op">));</span></span>
|
||||
<span id="cb4-20"><a href="#cb4-20"></a> <span class="cf">if</span> <span class="op">((</span>listitem <span class="op">=</span> le_data_get_listitem <span class="op">(</span>data<span class="op">))</span> <span class="op">!=</span> NULL<span class="op">)</span> <span class="op">{</span></span>
|
||||
<span id="cb4-21"><a href="#cb4-21"></a> button <span class="op">=</span> GTK_BUTTON <span class="op">(</span>gtk_list_item_get_child <span class="op">(</span>listitem<span class="op">));</span></span>
|
||||
<span id="cb4-22"><a href="#cb4-22"></a> gtk_widget_set_css_classes <span class="op">(</span>GTK_WIDGET <span class="op">(</span>button<span class="op">),</span> non_current<span class="op">);</span></span>
|
||||
<span id="cb4-23"><a href="#cb4-23"></a> g_object_unref <span class="op">(</span>listitem<span class="op">);</span></span>
|
||||
<span id="cb4-24"><a href="#cb4-24"></a> <span class="op">}</span></span>
|
||||
<span id="cb4-25"><a href="#cb4-25"></a> g_object_unref <span class="op">(</span>data<span class="op">);</span></span>
|
||||
<span id="cb4-26"><a href="#cb4-26"></a> <span class="op">}</span></span>
|
||||
<span id="cb4-27"><a href="#cb4-27"></a> win<span class="op">-></span>position <span class="op">=</span> new<span class="op">;</span></span>
|
||||
<span id="cb4-28"><a href="#cb4-28"></a> <span class="cf">if</span> <span class="op">(</span>win<span class="op">-></span>position <span class="op">>=</span><span class="dv">0</span><span class="op">)</span> <span class="op">{</span></span>
|
||||
<span id="cb4-29"><a href="#cb4-29"></a> data <span class="op">=</span> LE_DATA <span class="op">(</span>g_list_model_get_item <span class="op">(</span>G_LIST_MODEL <span class="op">(</span>win<span class="op">-></span>liststore<span class="op">),</span> win<span class="op">-></span>position<span class="op">));</span></span>
|
||||
<span id="cb4-30"><a href="#cb4-30"></a> <span class="cf">if</span> <span class="op">((</span>listitem <span class="op">=</span> le_data_get_listitem <span class="op">(</span>data<span class="op">))</span> <span class="op">!=</span> NULL<span class="op">)</span> <span class="op">{</span></span>
|
||||
<span id="cb4-31"><a href="#cb4-31"></a> button <span class="op">=</span> GTK_BUTTON <span class="op">(</span>gtk_list_item_get_child <span class="op">(</span>listitem<span class="op">));</span></span>
|
||||
<span id="cb4-32"><a href="#cb4-32"></a> gtk_widget_set_css_classes <span class="op">(</span>GTK_WIDGET <span class="op">(</span>button<span class="op">),</span> current<span class="op">);</span></span>
|
||||
<span id="cb4-33"><a href="#cb4-33"></a> g_object_unref <span class="op">(</span>listitem<span class="op">);</span></span>
|
||||
<span id="cb4-34"><a href="#cb4-34"></a> <span class="op">}</span></span>
|
||||
<span id="cb4-35"><a href="#cb4-35"></a> g_object_unref <span class="op">(</span>data<span class="op">);</span></span>
|
||||
<span id="cb4-36"><a href="#cb4-36"></a> <span class="op">}</span></span>
|
||||
<span id="cb4-37"><a href="#cb4-37"></a><span class="op">}</span></span></code></pre></div>
|
||||
<p>The function <code>update_current</code> does several things.</p>
|
||||
<ul>
|
||||
<li>It has two parameters. The first one is <code>win</code>, which is
|
||||
an instance of LeWindow class. It has some elements.
|
||||
<ul>
|
||||
<li>win->position: an Integer. it is the current position. If no
|
||||
current line exists, it is -1.</li>
|
||||
<li>win->position_label: GtkLabel. It shows the current
|
||||
position.</li>
|
||||
</ul></li>
|
||||
<li>The second parameter is <code>new</code>, which is the new current
|
||||
position. At the beginning of the function, win->position points the
|
||||
old position.</li>
|
||||
<li>10-16: Update the text of GtkLabel.</li>
|
||||
<li>18-26: If the old position (win->position) is not negative, the
|
||||
current line exists. It gets a GtkListItem instance via the item
|
||||
(LeData) of the list. And it gets the GtkButton instance which is the
|
||||
child of the GtkListItem. It clears the “css-classes” property of the
|
||||
button.</li>
|
||||
<li>27: Updates win->position.</li>
|
||||
<li>28-36: If the new position is not negative (It’s possible to be
|
||||
negative when the current line has been removed), the current line
|
||||
exists. It sets the “css-classes” property of the button to
|
||||
<code>{"current", NULL}</code>. It is a NULL-terminated array of
|
||||
strings. Each string is a CSS class. Now the button has “current” style
|
||||
class.</li>
|
||||
</ul>
|
||||
<p>The color of buttons are determined by the “background” CSS style.
|
||||
The following CSS is applied to the default GdkDisplay in advance (in
|
||||
the startup handler of the application).</p>
|
||||
<div class="sourceCode" id="cb5"><pre
|
||||
class="sourceCode css"><code class="sourceCode css"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a>columnview listview row button<span class="fu">.current</span> {<span class="kw">background</span>: <span class="cn">red</span><span class="op">;</span>}</span></code></pre></div>
|
||||
<p>The selectors “columnview listview row” is needed before “button”
|
||||
selector. Otherwise the buttons in the GtkColumnview won’t be found. The
|
||||
button selector has “current” class. So, the only “current” class button
|
||||
is colored with red. Other buttons are not colored, which means they are
|
||||
white.</p>
|
||||
<h2
|
||||
id="gtk_widget_dispose_template-function">Gtk_widget_dispose_template
|
||||
function</h2>
|
||||
<p>The function <code>gtk_widget_dispose_template</code> clears the
|
||||
template children for the given widget. This is the opposite of
|
||||
<code>gtk_widget_init_template()</code>. It is a new function of GTK 4.8
|
||||
version. If your GTK version is lower than 4.8, you need to modify the
|
||||
program.</p>
|
||||
</div>
|
||||
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-MrcW6ZMFYlzcLA8Nl+NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP+JcXn/tWtIaxVXM" crossorigin="anonymous"></script>
|
||||
</body>
|
||||
</html>
|
||||
|
|
@ -713,7 +713,7 @@ It defines the application and supports:
|
|||
10 GtkCssProvider *provider;
|
||||
11 };
|
||||
12
|
||||
13 G_DEFINE_TYPE (TfeApplication, tfe_application, GTK_TYPE_APPLICATION);
|
||||
13 G_DEFINE_TYPE (TfeApplication, tfe_application, GTK_TYPE_APPLICATION)
|
||||
14
|
||||
15 /* gsettings changed::font signal handler */
|
||||
16 static void
|
||||
|
|
|
|||
|
|
@ -1,4 +1,4 @@
|
|||
Up: [README.md](../README.md), Prev: [Section 28](sec28.md)
|
||||
Up: [README.md](../README.md), Prev: [Section 28](sec28.md), Next: [Section 30](sec30.md)
|
||||
|
||||
# GtkColumnView
|
||||
|
||||
|
|
@ -471,4 +471,4 @@ If you click the header of another column, then the whole lists are sorted by th
|
|||
GtkColumnView is very useful and it can manage very big GListModel.
|
||||
It is possible to use it for file list, application list, database frontend and so on.
|
||||
|
||||
Up: [README.md](../README.md), Prev: [Section 28](sec28.md)
|
||||
Up: [README.md](../README.md), Prev: [Section 28](sec28.md), Next: [Section 30](sec30.md)
|
||||
|
|
|
|||
303
gfm/sec30.md
Normal file
303
gfm/sec30.md
Normal file
|
|
@ -0,0 +1,303 @@
|
|||
Up: [README.md](../README.md), Prev: [Section 29](sec29.md)
|
||||
|
||||
# GtkSignalListItemFactory
|
||||
|
||||
## GtkSignalListItemFactory and GtkBulderListItemFactory
|
||||
|
||||
GtkBuilderlistItemFactory is convenient when GtkListView just shows the contents of a list.
|
||||
Its binding direction is always from an item of a list to a child of GtkListItem.
|
||||
|
||||
When it comes to dynamic connection, it's not enough.
|
||||
For example, you want to edit the contents of a list.
|
||||
You set a child of GtkListItem to a GtkText instance so a user can edit a text with it.
|
||||
You need to bind an item in the list with the buffer of the GtkText.
|
||||
The direction is opposite from the one with GtkBuilderListItemFactory.
|
||||
It is from the GtkText instance to the item in the list.
|
||||
You can implement this with GtkSignalListItemFactory, which is more flexible than GtkBuilderListItemFactory.
|
||||
|
||||
Two things are shown in this section.
|
||||
|
||||
- Binding from a child of a GtkListItem instance to an item of a list.
|
||||
- Access a child of GtkListItem dynamically.
|
||||
This direction is the same as the one with GtkBulderListItemFactory.
|
||||
But GtkBulderListItemFactory uses GtkExpression from the item property of the GtkListItem.
|
||||
So, it updates its child widget only when the item property changes.
|
||||
In this example the child reflects the change in the same item in the list dynamically.
|
||||
|
||||
This section shows just a part of the source file `listeditor.c`.
|
||||
If you want to see the whole codes, see `src/listeditor` directory of the [Gtk4 tutorial repository](https://github.com/ToshioCP/Gtk4-tutorial).
|
||||
|
||||
## A list editor
|
||||
|
||||
The sample program is a list editor and data of the list are strings.
|
||||
It's the same as a line editor.
|
||||
It reads a text file line by line.
|
||||
Each line is an item of the list.
|
||||
The list is displayed with GtkColumnView.
|
||||
There are two columns.
|
||||
The one is a button, which makes the line be a current line.
|
||||
If the line is the current line, the button is colored with red.
|
||||
The other is a string which is the contents of the corresponding item of the list.
|
||||
|
||||
|
||||
|
||||
The source files are located at `src/listeditor` directory.
|
||||
You can compile end execute it as follows.
|
||||
|
||||
- Download the program from the [repository](https://github.com/ToshioCP/Gtk4-tutorial).
|
||||
- Change your current directory to `src/listeditor`.
|
||||
- Type the following on your commandline.
|
||||
|
||||
~~~
|
||||
$ meson _build
|
||||
$ ninja -C _build
|
||||
$ _build/listeditor
|
||||
~~~
|
||||
|
||||
- Append button: appends a line after the current line, or at the last line if no current line exists.
|
||||
- Insert button: inserts a line before the current line.
|
||||
- Remove button: removes a current line.
|
||||
- Read button: reads a file.
|
||||
- Write button: writes the contents to a file.
|
||||
- close button: close the contents.
|
||||
- quit button: quit the application.
|
||||
- Button on the select column: makes the line current.
|
||||
- String column: GtkText. You can edit a string in the field.
|
||||
|
||||
The current line number (zero-based) is shown at the left of the tool bar.
|
||||
The file name is shown at the right of the write button.
|
||||
|
||||
## Connect a GtkText instance and an item in the list
|
||||
|
||||
The second column (GtkColumnViewColumn) sets its factory property to GtkSignalListItemFactory.
|
||||
It uses three signals setup, bind and unbind.
|
||||
The following is their sgnal handlers.
|
||||
|
||||
~~~C
|
||||
1 static void
|
||||
2 setup2_cb (GtkListItemFactory *factory, GtkListItem *listitem) {
|
||||
3 GtkWidget *text = gtk_text_new ();
|
||||
4 gtk_list_item_set_child (listitem, GTK_WIDGET (text));
|
||||
5 }
|
||||
6
|
||||
7 static void
|
||||
8 bind2_cb (GtkListItemFactory *factory, GtkListItem *listitem) {
|
||||
9 GtkWidget *text = gtk_list_item_get_child (listitem);
|
||||
10 LeData *data = LE_DATA (gtk_list_item_get_item (listitem));
|
||||
11 GtkEntryBuffer *buffer;
|
||||
12 GBinding *bind;
|
||||
13
|
||||
14 buffer = gtk_text_get_buffer (GTK_TEXT (text));
|
||||
15 gtk_entry_buffer_set_text (buffer, le_data_look_string (data), -1);
|
||||
16 bind = g_object_bind_property (buffer, "text", data, "string", G_BINDING_DEFAULT);
|
||||
17 g_object_set_data (G_OBJECT (listitem), "bind", bind);
|
||||
18 }
|
||||
19
|
||||
20 static void
|
||||
21 unbind2_cb (GtkListItemFactory *factory, GtkListItem *listitem) {
|
||||
22 GBinding *bind = G_BINDING (g_object_get_data (G_OBJECT (listitem), "bind"));
|
||||
23
|
||||
24 g_binding_unbind(bind);
|
||||
25 g_object_set_data (G_OBJECT (listitem), "bind", NULL);
|
||||
26 }
|
||||
~~~
|
||||
|
||||
- 1-5: `setup2_cb` is a setup signal handler on the GtkSignalListItemFactory.
|
||||
This factory is inserted to the factory property of the second GtkColumnViewColumn.
|
||||
Te handler just creates a GtkText instance and sets the child of `listitem` to it.
|
||||
The instance will be destroyed automatically when the `listitem` is destroyed.
|
||||
So, teardown signal handler isn't necessary.
|
||||
- 7-18: `bind2_cb` is a bind signal handler.
|
||||
It is called when the `listitem` is bound to an item in the list.
|
||||
The list items are LeData instances.
|
||||
LeData is defined in the file `listeditor.c` (the C source file of the list editor).
|
||||
It is a child class of GObject and has two data.
|
||||
The one is `listitem` which points a GtkListItem instance when they are connected.
|
||||
If no GtkListItem is connected, it is NULL.
|
||||
The other is `string` which is a content of the line.
|
||||
- 9-10: `text` is a child of the `listitem` and it is a GtkText instance.
|
||||
`data` is an item pointed by the `listitem`. It is a LeData instance.
|
||||
- 14: Gets the buffer of the `text`.
|
||||
- 15: Sets the text of the buffer to `le_data_look_string (data)`.
|
||||
le\_data\_look\_string returns the string of the data and the ownership of the string is taken by the `data`.
|
||||
So, the caller don't need to free the string.
|
||||
- 16: `g_object_bind_property` binds a property and another object property.
|
||||
This line binds the "text" property of the `buffer` (source) and the "string" property of the `data` (destination).
|
||||
It is a uni-directional binding (`G_BINDING_DEFAULT`).
|
||||
When a user changes the GtkText text, the same string is immediately put into the `data`.
|
||||
The function returns a GBinding instance.
|
||||
This binding is different from bindings of GtkExpression.
|
||||
This binding needs the existence of the two properties.
|
||||
- 17: GObjec has a table.
|
||||
The key is a string (or GQuark) and the value is a gpointer (pointer to any type).
|
||||
The function `g_object_set_data` sets the association from the key to the value.
|
||||
This line sets the association from "bind" to `bind` instance on the `listitem` instance.
|
||||
It makes possible for the "unbind" handler to get the `bind` instance.
|
||||
- 20-26: `unbind2_cb` is a unbind signal handler.
|
||||
- 22: Retrieves the `bind` instance from the table in the `listitem` instance.
|
||||
- 24: Unbind the binding.
|
||||
- 25: Removes the value corresponds to the "bind" key.
|
||||
|
||||
This technique is not so complicated.
|
||||
You can use it when you make a cell editable application.
|
||||
|
||||
## Change the cell of GtkColumnView dynamically
|
||||
|
||||
Next topic is to change the GtkColumnView (or GtkListView) cells dynamically.
|
||||
The example changes the color of the buttons, which are children of GtkListItem instances, as the current line position moves.
|
||||
|
||||
The line editor has the current position of the list.
|
||||
|
||||
- At first, no line is current.
|
||||
- When a line is appended or inserted, the line is current.
|
||||
- When the current line is deleted, no line will be current.
|
||||
- When a button in the first column of GtkColumnView is clicked, the line will be current.
|
||||
|
||||
The button of the current line is colored with red and otherwise white.
|
||||
|
||||
The current line has no relationship to GtkSingleSelection object.
|
||||
GtkSingleSelection selects a line on the display.
|
||||
The current line doesn't need to be on the display.
|
||||
It is possible to be on the line out of the Window (GtkScrolledWindow).
|
||||
Actually, the program doesn't use GtkSingleSelection.
|
||||
|
||||
It is necessary to know the corresponding GtkListItem instance from the item in the list.
|
||||
It is the opposite direction from `gtk_list_item_get_item` function.
|
||||
To accomplish this, we set a `listitem` element of LeData to point the corresponding GtkListItem instance.
|
||||
Therefore, items (LeData) in the list always know the GtkListItem.
|
||||
If there's no GtkListItem binded to the item, NULL is assigned.
|
||||
|
||||
~~~C
|
||||
1 void
|
||||
2 select_cb (GtkButton *btn, GtkListItem *listitem) {
|
||||
3 LeWindow *win = LE_WINDOW (gtk_widget_get_ancestor (GTK_WIDGET (btn), LE_TYPE_WINDOW));
|
||||
4
|
||||
5 update_current (win, gtk_list_item_get_position (listitem));
|
||||
6 }
|
||||
7
|
||||
8 static void
|
||||
9 setup1_cb (GtkListItemFactory *factory, GtkListItem *listitem) {
|
||||
10 GtkWidget *button = gtk_button_new ();
|
||||
11 gtk_list_item_set_child (listitem, button);
|
||||
12 g_signal_connect (button, "clicked", G_CALLBACK (select_cb), listitem);
|
||||
13 }
|
||||
14
|
||||
15 static void
|
||||
16 bind1_cb (GtkListItemFactory *factory, GtkListItem *listitem) {
|
||||
17 LeData *data = LE_DATA (gtk_list_item_get_item (listitem));
|
||||
18 if (data)
|
||||
19 le_data_set_listitem (data, listitem);
|
||||
20 }
|
||||
21
|
||||
22 static void
|
||||
23 unbind1_cb (GtkListItemFactory *factory, GtkListItem *listitem) {
|
||||
24 LeData *data = LE_DATA (gtk_list_item_get_item (listitem));
|
||||
25 if (data)
|
||||
26 le_data_set_listitem (data, NULL);
|
||||
27 }
|
||||
~~~
|
||||
|
||||
- 8-13: `setup1_cb` is a setup signal handler on the GtkSignalListItemFactory.
|
||||
This factory is inserted to the factory property of the first GtkColumnViewColumn.
|
||||
It sets the child of `listitem` to a newly created GtkButton instance.
|
||||
The "clicked" signal on the button is connected to the handler `select_cb`.
|
||||
When the listitem is destroyed, the child (GtkButton) is also destroyed.
|
||||
At the same time, the connection of the signal and handler is also destroyed.
|
||||
So, you don't need teardown signal handler.
|
||||
- 1-6: `select_cb` is a "clicked" signal handler.
|
||||
LeWindow is defined in `listeditor.c`.
|
||||
It's a child class of GtkApplicationWindow.
|
||||
The handler just calls the `update_current` function.
|
||||
The function will be explained later.
|
||||
- 15-20: `bind1_cb` is a bind signal handler.
|
||||
It sets the "listitem" element of the item (LeData) to point the `listitem` (GtkListItem instance).
|
||||
It makes the item possible to find the corresponding GtkListItem instance.
|
||||
- 22-27: `unbind1_cb` is an unbind signal handler.
|
||||
It removes the `listitem` instance from the "listitem" element of the item.
|
||||
The element becomes NULL, which tells no GtkListItem is bound.
|
||||
When referring GtkListItem, it needs to check the "listitem" element whether it points a GtkListItem or not (NULL).
|
||||
Otherwise bad things will happen.
|
||||
|
||||
~~~C
|
||||
1 static void
|
||||
2 update_current (LeWindow *win, int new) {
|
||||
3 char *s;
|
||||
4 LeData *data;
|
||||
5 GtkListItem *listitem;
|
||||
6 GtkButton *button;
|
||||
7 const char *non_current[1] = {NULL};
|
||||
8 const char *current[2] = {"current", NULL};
|
||||
9
|
||||
10 if (new >= 0)
|
||||
11 s = g_strdup_printf ("%d", new);
|
||||
12 else
|
||||
13 s = "";
|
||||
14 gtk_label_set_text (GTK_LABEL (win->position_label), s);
|
||||
15 if (*s) // s isn't an empty string
|
||||
16 g_free (s);
|
||||
17
|
||||
18 if (win->position >=0) {
|
||||
19 data = LE_DATA (g_list_model_get_item (G_LIST_MODEL (win->liststore), win->position));
|
||||
20 if ((listitem = le_data_get_listitem (data)) != NULL) {
|
||||
21 button = GTK_BUTTON (gtk_list_item_get_child (listitem));
|
||||
22 gtk_widget_set_css_classes (GTK_WIDGET (button), non_current);
|
||||
23 g_object_unref (listitem);
|
||||
24 }
|
||||
25 g_object_unref (data);
|
||||
26 }
|
||||
27 win->position = new;
|
||||
28 if (win->position >=0) {
|
||||
29 data = LE_DATA (g_list_model_get_item (G_LIST_MODEL (win->liststore), win->position));
|
||||
30 if ((listitem = le_data_get_listitem (data)) != NULL) {
|
||||
31 button = GTK_BUTTON (gtk_list_item_get_child (listitem));
|
||||
32 gtk_widget_set_css_classes (GTK_WIDGET (button), current);
|
||||
33 g_object_unref (listitem);
|
||||
34 }
|
||||
35 g_object_unref (data);
|
||||
36 }
|
||||
37 }
|
||||
~~~
|
||||
|
||||
|
||||
The function `update_current` does several things.
|
||||
|
||||
- It has two parameters.
|
||||
The first one is `win`, which is an instance of LeWindow class.
|
||||
It has some elements.
|
||||
- win->position: an Integer. it is the current position. If no current line exists, it is -1.
|
||||
- win->position_label: GtkLabel. It shows the current position.
|
||||
- The second parameter is `new`, which is the new current position.
|
||||
At the beginning of the function, win->position points the old position.
|
||||
- 10-16: Update the text of GtkLabel.
|
||||
- 18-26: If the old position (win->position) is not negative, the current line exists.
|
||||
It gets a GtkListItem instance via the item (LeData) of the list.
|
||||
And it gets the GtkButton instance which is the child of the GtkListItem.
|
||||
It clears the "css-classes" property of the button.
|
||||
- 27: Updates win->position.
|
||||
- 28-36: If the new position is not negative (It's possible to be negative when the current line has been removed), the current line exists.
|
||||
It sets the "css-classes" property of the button to `{"current", NULL}`.
|
||||
It is a NULL-terminated array of strings.
|
||||
Each string is a CSS class.
|
||||
Now the button has "current" style class.
|
||||
|
||||
The color of buttons are determined by the "background" CSS style.
|
||||
The following CSS is applied to the default GdkDisplay in advance (in the startup handler of the application).
|
||||
|
||||
~~~css
|
||||
columnview listview row button.current {background: red;}
|
||||
~~~
|
||||
|
||||
The selectors "columnview listview row" is needed before "button" selector.
|
||||
Otherwise the buttons in the GtkColumnview won't be found.
|
||||
The button selector has "current" class.
|
||||
So, the only "current" class button is colored with red.
|
||||
Other buttons are not colored, which means they are white.
|
||||
|
||||
## Gtk\_widget\_dispose\_template function
|
||||
|
||||
The function `gtk_widget_dispose_template` clears the template children for the given widget.
|
||||
This is the opposite of `gtk_widget_init_template()`.
|
||||
It is a new function of GTK 4.8 version.
|
||||
If your GTK version is lower than 4.8, you need to modify the program.
|
||||
|
||||
Up: [README.md](../README.md), Prev: [Section 29](sec29.md)
|
||||
BIN
image/listeditor.png
Normal file
BIN
image/listeditor.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 23 KiB |
17
src/listeditor/.vscode/c_cpp_properties.json
vendored
Normal file
17
src/listeditor/.vscode/c_cpp_properties.json
vendored
Normal file
|
|
@ -0,0 +1,17 @@
|
|||
{
|
||||
"configurations": [
|
||||
{
|
||||
"name": "Linux",
|
||||
"includePath": [
|
||||
"${workspaceFolder}/**"
|
||||
],
|
||||
"defines": [],
|
||||
"compilerPath": "/usr/bin/gcc",
|
||||
"cStandard": "gnu17",
|
||||
"cppStandard": "gnu++17",
|
||||
"intelliSenseMode": "linux-gcc-x64",
|
||||
"compileCommands": "${workspaceFolder}/_build/compile_commands.json"
|
||||
}
|
||||
],
|
||||
"version": 4
|
||||
}
|
||||
530
src/listeditor/listeditor.c
Normal file
530
src/listeditor/listeditor.c
Normal file
|
|
@ -0,0 +1,530 @@
|
|||
#include <gtk/gtk.h>
|
||||
|
||||
#define LE_TYPE_DATA (le_data_get_type ())
|
||||
G_DECLARE_FINAL_TYPE (LeData, le_data, LE, DATA, GObject)
|
||||
|
||||
enum {
|
||||
PROP_0,
|
||||
PROP_STRING,
|
||||
N_PROPERTIES
|
||||
};
|
||||
|
||||
static GParamSpec *ledata_properties[N_PROPERTIES] = {NULL, };
|
||||
|
||||
typedef struct _LeData {
|
||||
GObject parent;
|
||||
GtkListItem *listitem;
|
||||
char *string;
|
||||
} LeData;
|
||||
|
||||
G_DEFINE_TYPE(LeData, le_data, G_TYPE_OBJECT)
|
||||
|
||||
static void
|
||||
le_data_set_property (GObject *object, guint property_id, const GValue *value, GParamSpec *pspec) {
|
||||
LeData *self = LE_DATA (object);
|
||||
|
||||
if (property_id == PROP_STRING)
|
||||
self->string = g_strdup (g_value_get_string (value));
|
||||
else
|
||||
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
|
||||
}
|
||||
|
||||
static void
|
||||
le_data_get_property (GObject *object, guint property_id, GValue *value, GParamSpec *pspec) {
|
||||
LeData *self = LE_DATA (object);
|
||||
|
||||
if (property_id == PROP_STRING)
|
||||
g_value_set_string (value, g_strdup (self->string));
|
||||
else
|
||||
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
|
||||
}
|
||||
|
||||
static void
|
||||
le_data_init (LeData *self) {
|
||||
self->listitem = NULL;
|
||||
self->string = NULL;
|
||||
}
|
||||
|
||||
static void
|
||||
le_data_dispose (GObject *object) {
|
||||
LeData *self = LE_DATA (object);
|
||||
|
||||
if (self->listitem)
|
||||
g_clear_object (&self->listitem);
|
||||
G_OBJECT_CLASS (le_data_parent_class)->dispose (object);
|
||||
}
|
||||
|
||||
static void
|
||||
le_data_finalize (GObject *object) {
|
||||
LeData *self = LE_DATA (object);
|
||||
|
||||
if (self->string)
|
||||
g_free (self->string);
|
||||
G_OBJECT_CLASS (le_data_parent_class)->finalize (object);
|
||||
}
|
||||
|
||||
static void
|
||||
le_data_class_init (LeDataClass *class) {
|
||||
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
|
||||
|
||||
gobject_class->finalize = le_data_dispose;
|
||||
gobject_class->finalize = le_data_finalize;
|
||||
gobject_class->set_property = le_data_set_property;
|
||||
gobject_class->get_property = le_data_get_property;
|
||||
ledata_properties[PROP_STRING] = g_param_spec_string ("string", "string", "string", "", G_PARAM_READWRITE);
|
||||
g_object_class_install_properties (gobject_class,N_PROPERTIES, ledata_properties);
|
||||
}
|
||||
|
||||
/* setter and getter */
|
||||
void
|
||||
le_data_set_listitem (LeData *self, GtkListItem *listitem) {
|
||||
g_return_if_fail (GTK_IS_LIST_ITEM (listitem) || listitem == NULL);
|
||||
|
||||
if (self->listitem)
|
||||
g_object_unref (self->listitem);
|
||||
self->listitem = listitem ? g_object_ref (listitem) : NULL;
|
||||
}
|
||||
|
||||
void
|
||||
le_data_set_string (LeData *self, const char *string) {
|
||||
if (self->string)
|
||||
g_free (self->string);
|
||||
self->string = g_strdup (string);
|
||||
}
|
||||
|
||||
void
|
||||
le_data_take_string (LeData *self, char *string) {
|
||||
if (self->string)
|
||||
g_free (self->string);
|
||||
self->string = string;
|
||||
}
|
||||
|
||||
GtkListItem *
|
||||
le_data_get_listitem (LeData *self) {
|
||||
return g_object_ref (self->listitem);
|
||||
}
|
||||
|
||||
GtkListItem *
|
||||
le_data_look_listitem (LeData *self) {
|
||||
return self->listitem;
|
||||
}
|
||||
|
||||
char *
|
||||
le_data_get_string (LeData *self) {
|
||||
return g_strdup (self->string);
|
||||
}
|
||||
|
||||
const char *
|
||||
le_data_look_string (LeData *self) {
|
||||
return self->string;
|
||||
}
|
||||
|
||||
LeData *
|
||||
le_data_new_with_data (GtkListItem *listitem, const char *string) {
|
||||
g_return_val_if_fail (GTK_IS_LIST_ITEM (listitem) || listitem == NULL, NULL);
|
||||
LeData *data;
|
||||
|
||||
data = LE_DATA (g_object_new (LE_TYPE_DATA, NULL));
|
||||
data->listitem = listitem ? g_object_ref (listitem) : NULL;
|
||||
data->string = g_strdup (string);
|
||||
return data;
|
||||
}
|
||||
|
||||
LeData *
|
||||
le_data_new (void) {
|
||||
return LE_DATA (g_object_new (LE_TYPE_DATA, NULL));
|
||||
}
|
||||
|
||||
/* ----- definition of LeWindow ----- */
|
||||
#define LE_TYPE_WINDOW (le_window_get_type ())
|
||||
G_DECLARE_FINAL_TYPE (LeWindow, le_window, LE, WINDOW, GtkApplicationWindow)
|
||||
typedef struct _LeWindow {
|
||||
GtkApplicationWindow parent;
|
||||
int position; /* current position */
|
||||
GFile *file;
|
||||
GtkWidget *position_label;
|
||||
GtkWidget *filename;
|
||||
GtkWidget *columnview;
|
||||
GListStore *liststore;
|
||||
} LeWindow;
|
||||
G_DEFINE_TYPE (LeWindow, le_window, GTK_TYPE_APPLICATION_WINDOW)
|
||||
|
||||
static void
|
||||
update_current (LeWindow *win, int new) {
|
||||
char *s;
|
||||
LeData *data;
|
||||
GtkListItem *listitem;
|
||||
GtkButton *button;
|
||||
const char *non_current[1] = {NULL};
|
||||
const char *current[2] = {"current", NULL};
|
||||
|
||||
if (new >= 0)
|
||||
s = g_strdup_printf ("%d", new);
|
||||
else
|
||||
s = "";
|
||||
gtk_label_set_text (GTK_LABEL (win->position_label), s);
|
||||
if (*s) // s isn't an empty string
|
||||
g_free (s);
|
||||
|
||||
if (win->position >=0) {
|
||||
data = LE_DATA (g_list_model_get_item (G_LIST_MODEL (win->liststore), win->position));
|
||||
if ((listitem = le_data_get_listitem (data)) != NULL) {
|
||||
button = GTK_BUTTON (gtk_list_item_get_child (listitem));
|
||||
gtk_widget_set_css_classes (GTK_WIDGET (button), non_current);
|
||||
g_object_unref (listitem);
|
||||
}
|
||||
g_object_unref (data);
|
||||
}
|
||||
win->position = new;
|
||||
if (win->position >=0) {
|
||||
data = LE_DATA (g_list_model_get_item (G_LIST_MODEL (win->liststore), win->position));
|
||||
if ((listitem = le_data_get_listitem (data)) != NULL) {
|
||||
button = GTK_BUTTON (gtk_list_item_get_child (listitem));
|
||||
gtk_widget_set_css_classes (GTK_WIDGET (button), current);
|
||||
g_object_unref (listitem);
|
||||
}
|
||||
g_object_unref (data);
|
||||
}
|
||||
}
|
||||
|
||||
/* ----- Button "clicled" signal handlers ----- */
|
||||
static void
|
||||
app_cb (GtkButton *btn, LeWindow *win) {
|
||||
LeData *data;
|
||||
|
||||
data = le_data_new_with_data (NULL, "");
|
||||
if (win->position >= 0) {
|
||||
g_list_store_insert (win->liststore, win->position + 1, data);
|
||||
update_current (win, win->position + 1);
|
||||
} else {
|
||||
g_list_store_append (win->liststore, data);
|
||||
update_current (win, g_list_model_get_n_items (G_LIST_MODEL (win->liststore)) - 1);
|
||||
}
|
||||
g_object_unref (data);
|
||||
}
|
||||
|
||||
static void
|
||||
ins_cb (GtkButton *btn, LeWindow *win) {
|
||||
LeData *data;
|
||||
|
||||
data = le_data_new_with_data (NULL, "");
|
||||
if (win->position >= 0) {
|
||||
g_list_store_insert (win->liststore, win->position, data);
|
||||
win->position += 1;
|
||||
update_current (win, win->position - 1);
|
||||
}
|
||||
g_object_unref (data);
|
||||
}
|
||||
|
||||
static void
|
||||
rm_cb (GtkButton *btn, LeWindow *win) {
|
||||
if (win->position >= 0) {
|
||||
g_list_store_remove (win->liststore, win->position);
|
||||
win->position = -1;
|
||||
update_current (win, -1);
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
open_dialog_response(GtkWidget *dialog, gint response, LeWindow *win) {
|
||||
GFile *file;
|
||||
char *contents;
|
||||
char *s;
|
||||
gsize length;
|
||||
GFileInputStream *stream;
|
||||
GDataInputStream *dstream;
|
||||
GError *err = NULL;
|
||||
LeData *data;
|
||||
|
||||
if (response == GTK_RESPONSE_ACCEPT
|
||||
&& G_IS_FILE (file = gtk_file_chooser_get_file (GTK_FILE_CHOOSER (dialog)))
|
||||
&& g_file_load_contents (file, NULL, &contents, &length, NULL, &err)) {
|
||||
if (! (stream = g_file_read (file, NULL, &err))) {
|
||||
g_warning ("%s\n", err->message);
|
||||
g_error_free (err);
|
||||
return;
|
||||
}
|
||||
dstream = g_data_input_stream_new (G_INPUT_STREAM (stream));
|
||||
g_object_unref (stream);
|
||||
while ((contents = g_data_input_stream_read_line_utf8 (dstream, &length, NULL, &err)) != NULL) {
|
||||
data = le_data_new_with_data (NULL, contents);
|
||||
g_free (contents);
|
||||
g_list_store_append (win->liststore, data);
|
||||
g_object_unref (data);
|
||||
}
|
||||
if (err) {
|
||||
g_warning ("%s\n", err->message);
|
||||
if (g_list_model_get_n_items(G_LIST_MODEL (win->liststore)) > 0)
|
||||
g_list_store_remove_all (win->liststore);
|
||||
return;
|
||||
} else if (! g_input_stream_close (G_INPUT_STREAM (dstream), NULL, &err)) { /* EOF */
|
||||
g_warning ("%s\n", err->message);
|
||||
g_error_free (err);
|
||||
return;
|
||||
}
|
||||
win->file = file; /* win->file is NULL (has already checked) and it take the ownership of 'file' */
|
||||
s = g_file_get_basename (file);
|
||||
gtk_label_set_text (GTK_LABEL (win->filename), s);
|
||||
g_free (s);
|
||||
update_current (win, -1);
|
||||
}
|
||||
gtk_window_destroy (GTK_WINDOW (dialog));
|
||||
}
|
||||
|
||||
static void
|
||||
read_cb (GtkButton *btn, LeWindow *win) {
|
||||
GtkWidget *dialog;
|
||||
|
||||
if (win->file || g_list_model_get_n_items (G_LIST_MODEL (win->liststore)) > 0)
|
||||
return;
|
||||
dialog = gtk_file_chooser_dialog_new ("Open file", GTK_WINDOW (win), GTK_FILE_CHOOSER_ACTION_OPEN,
|
||||
"Cancel", GTK_RESPONSE_CANCEL,
|
||||
"Open", GTK_RESPONSE_ACCEPT,
|
||||
NULL);
|
||||
g_signal_connect (dialog, "response", G_CALLBACK (open_dialog_response), win);
|
||||
gtk_window_present (GTK_WINDOW (dialog));
|
||||
}
|
||||
|
||||
static void
|
||||
write_data (LeWindow *win) {
|
||||
GFileOutputStream *ostream;
|
||||
gssize size;
|
||||
gsize length;
|
||||
LeData *data;
|
||||
int i, n_items;
|
||||
GError *err = NULL;
|
||||
|
||||
if (! (ostream = g_file_replace (win->file, NULL, TRUE, G_FILE_CREATE_NONE, NULL, &err))) {
|
||||
g_warning ("%s\n", err->message);
|
||||
g_error_free (err);
|
||||
return;
|
||||
}
|
||||
n_items = g_list_model_get_n_items (G_LIST_MODEL (win->liststore));
|
||||
for (i=0; i<n_items; ++i) {
|
||||
data = LE_DATA (g_list_model_get_item (G_LIST_MODEL (win->liststore), i));
|
||||
length = (gsize) strlen (le_data_look_string (data));
|
||||
size = g_output_stream_write (G_OUTPUT_STREAM (ostream), le_data_look_string (data), length, NULL, &err);
|
||||
g_object_unref (data);
|
||||
if (size < 0) {
|
||||
g_warning ("%s\n", err->message);
|
||||
g_error_free (err);
|
||||
break;
|
||||
}
|
||||
size = g_output_stream_write (G_OUTPUT_STREAM (ostream), "\n", 1, NULL, &err);
|
||||
if (size < 0) {
|
||||
g_warning ("%s\n", err->message);
|
||||
g_error_free (err);
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (! (g_output_stream_close (G_OUTPUT_STREAM (ostream), NULL, &err))) {
|
||||
g_warning ("%s\n", err->message);
|
||||
g_error_free (err);
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
saveas_dialog_response (GtkWidget *dialog, gint response, LeWindow *win) {
|
||||
GFile *file;
|
||||
char *s;
|
||||
|
||||
if (response == GTK_RESPONSE_ACCEPT) {
|
||||
file = gtk_file_chooser_get_file (GTK_FILE_CHOOSER (dialog));
|
||||
if (G_IS_FILE (file)) {
|
||||
win->file = file; /* the ownership is taken by win */
|
||||
s = g_file_get_basename (file);
|
||||
gtk_label_set_text (GTK_LABEL (win->filename), s);
|
||||
g_free (s);
|
||||
write_data (win);
|
||||
}
|
||||
else {
|
||||
g_warning ("gtk_file_chooser_get_file returns non GFile.\n");
|
||||
}
|
||||
}
|
||||
gtk_window_destroy (GTK_WINDOW (dialog));
|
||||
}
|
||||
|
||||
static void
|
||||
show_saveas_dialog (LeWindow *win) {
|
||||
GtkWidget *dialog;
|
||||
|
||||
dialog = gtk_file_chooser_dialog_new ("Save file", GTK_WINDOW (win), GTK_FILE_CHOOSER_ACTION_SAVE,
|
||||
"Cancel", GTK_RESPONSE_CANCEL,
|
||||
"Save", GTK_RESPONSE_ACCEPT,
|
||||
NULL);
|
||||
g_signal_connect (dialog, "response", G_CALLBACK (saveas_dialog_response), win);
|
||||
gtk_widget_show (dialog);
|
||||
}
|
||||
|
||||
static void
|
||||
write_cb (GtkButton *btn, LeWindow *win) {
|
||||
if (g_list_model_get_n_items (G_LIST_MODEL (win->liststore)) == 0)
|
||||
return;
|
||||
if (win->file)
|
||||
write_data (win);
|
||||
else
|
||||
show_saveas_dialog (win);
|
||||
}
|
||||
|
||||
static void
|
||||
close_cb (GtkButton *btn, LeWindow *win) {
|
||||
if (g_list_model_get_n_items (G_LIST_MODEL (win->liststore)) > 0)
|
||||
g_list_store_remove_all (win->liststore);
|
||||
if (win->file) {
|
||||
g_clear_object (&win->file);
|
||||
gtk_label_set_text (GTK_LABEL (win->filename), "");
|
||||
}
|
||||
win->position = -1;
|
||||
gtk_label_set_text (GTK_LABEL (win->position_label), "");
|
||||
}
|
||||
|
||||
static void
|
||||
quit_cb (GtkButton *btn, LeWindow *win) {
|
||||
GtkApplication *app = gtk_window_get_application (GTK_WINDOW (win));
|
||||
g_application_quit (G_APPLICATION (app));
|
||||
}
|
||||
|
||||
void
|
||||
select_cb (GtkButton *btn, GtkListItem *listitem) {
|
||||
LeWindow *win = LE_WINDOW (gtk_widget_get_ancestor (GTK_WIDGET (btn), LE_TYPE_WINDOW));
|
||||
|
||||
update_current (win, gtk_list_item_get_position (listitem));
|
||||
}
|
||||
|
||||
/* ----- Handlers on GtkSignalListItemFacory ----- */
|
||||
static void
|
||||
setup1_cb (GtkListItemFactory *factory, GtkListItem *listitem) {
|
||||
GtkWidget *button = gtk_button_new ();
|
||||
gtk_list_item_set_child (listitem, button);
|
||||
g_signal_connect (button, "clicked", G_CALLBACK (select_cb), listitem);
|
||||
}
|
||||
|
||||
static void
|
||||
bind1_cb (GtkListItemFactory *factory, GtkListItem *listitem) {
|
||||
LeData *data = LE_DATA (gtk_list_item_get_item (listitem));
|
||||
if (data)
|
||||
le_data_set_listitem (data, listitem);
|
||||
}
|
||||
|
||||
static void
|
||||
unbind1_cb (GtkListItemFactory *factory, GtkListItem *listitem) {
|
||||
LeData *data = LE_DATA (gtk_list_item_get_item (listitem));
|
||||
if (data)
|
||||
le_data_set_listitem (data, NULL);
|
||||
}
|
||||
|
||||
static void
|
||||
setup2_cb (GtkListItemFactory *factory, GtkListItem *listitem) {
|
||||
GtkWidget *text = gtk_text_new ();
|
||||
gtk_list_item_set_child (listitem, GTK_WIDGET (text));
|
||||
}
|
||||
|
||||
static void
|
||||
bind2_cb (GtkListItemFactory *factory, GtkListItem *listitem) {
|
||||
GtkWidget *text = gtk_list_item_get_child (listitem);
|
||||
LeData *data = LE_DATA (gtk_list_item_get_item (listitem));
|
||||
GtkEntryBuffer *buffer;
|
||||
GBinding *bind;
|
||||
|
||||
buffer = gtk_text_get_buffer (GTK_TEXT (text));
|
||||
gtk_entry_buffer_set_text (buffer, le_data_look_string (data), -1);
|
||||
bind = g_object_bind_property (buffer, "text", data, "string", G_BINDING_DEFAULT);
|
||||
g_object_set_data (G_OBJECT (listitem), "bind", bind);
|
||||
}
|
||||
|
||||
static void
|
||||
unbind2_cb (GtkListItemFactory *factory, GtkListItem *listitem) {
|
||||
GBinding *bind = G_BINDING (g_object_get_data (G_OBJECT (listitem), "bind"));
|
||||
|
||||
g_binding_unbind(bind);
|
||||
g_object_set_data (G_OBJECT (listitem), "bind", NULL);
|
||||
}
|
||||
|
||||
static void
|
||||
le_window_init (LeWindow *win) {
|
||||
gtk_widget_init_template (GTK_WIDGET (win));
|
||||
|
||||
win->position = -1;
|
||||
win->file =NULL;
|
||||
}
|
||||
|
||||
static void
|
||||
le_window_dispose (GObject *object) {
|
||||
LeWindow *win = LE_WINDOW (object);
|
||||
|
||||
/* this function is available since GTK 4.8 */
|
||||
gtk_widget_dispose_template (GTK_WIDGET (win), LE_TYPE_WINDOW);
|
||||
/* chain to the parent */
|
||||
G_OBJECT_CLASS (le_window_parent_class)->dispose (object);
|
||||
}
|
||||
|
||||
static void
|
||||
le_window_class_init (LeWindowClass *class) {
|
||||
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
|
||||
|
||||
gobject_class->dispose = le_window_dispose;
|
||||
|
||||
gtk_widget_class_set_template_from_resource (GTK_WIDGET_CLASS (class), "/com/github/ToshioCP/listeditor/listeditor.ui");
|
||||
gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class), LeWindow, position_label);
|
||||
gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class), LeWindow, filename);
|
||||
gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class), LeWindow, columnview);
|
||||
gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class), LeWindow, liststore);
|
||||
/* The followint macros are available since GTK 4.8 */
|
||||
gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class), app_cb);
|
||||
gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class), ins_cb);
|
||||
gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class), rm_cb);
|
||||
gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class), read_cb);
|
||||
gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class), write_cb);
|
||||
gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class), close_cb);
|
||||
gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class), quit_cb);
|
||||
gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class), setup1_cb);
|
||||
gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class), bind1_cb);
|
||||
gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class), unbind1_cb);
|
||||
gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class), setup2_cb);
|
||||
gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class), bind2_cb);
|
||||
gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class), unbind2_cb);
|
||||
}
|
||||
|
||||
GtkWidget *
|
||||
le_window_new (GtkApplication *app) {
|
||||
g_return_val_if_fail (GTK_IS_APPLICATION (app), NULL);
|
||||
|
||||
return GTK_WIDGET (g_object_new (LE_TYPE_WINDOW, "application", app, NULL));
|
||||
}
|
||||
|
||||
/* ----- activate, startup handlers ----- */
|
||||
static void
|
||||
app_activate (GApplication *application) {
|
||||
GtkApplication *app = GTK_APPLICATION (application);
|
||||
gtk_window_present (gtk_application_get_active_window(app));
|
||||
}
|
||||
|
||||
static void
|
||||
app_startup (GApplication *application) {
|
||||
GtkApplication *app = GTK_APPLICATION (application);
|
||||
GtkCssProvider *provider;
|
||||
|
||||
le_window_new (app);
|
||||
provider = gtk_css_provider_new ();
|
||||
gtk_css_provider_load_from_data (provider, "text:focus {border: 1px solid gray;} columnview listview row button.current {background: red;}", -1);
|
||||
gtk_style_context_add_provider_for_display (gdk_display_get_default (),
|
||||
GTK_STYLE_PROVIDER (provider), GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
|
||||
g_object_unref (provider);
|
||||
}
|
||||
|
||||
#define APPLICATION_ID "com.github.ToshioCP.listeditor"
|
||||
|
||||
int
|
||||
main (int argc, char **argv) {
|
||||
GtkApplication *app;
|
||||
int stat;
|
||||
|
||||
app = gtk_application_new (APPLICATION_ID, G_APPLICATION_DEFAULT_FLAGS);
|
||||
|
||||
g_signal_connect (app, "startup", G_CALLBACK (app_startup), NULL);
|
||||
g_signal_connect (app, "activate", G_CALLBACK (app_activate), NULL);
|
||||
|
||||
stat =g_application_run (G_APPLICATION (app), argc, argv);
|
||||
g_object_unref (app);
|
||||
return stat;
|
||||
}
|
||||
6
src/listeditor/listeditor.gresource.xml
Normal file
6
src/listeditor/listeditor.gresource.xml
Normal file
|
|
@ -0,0 +1,6 @@
|
|||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<gresources>
|
||||
<gresource prefix="/com/github/ToshioCP/listeditor">
|
||||
<file>listeditor.ui</file>
|
||||
</gresource>
|
||||
</gresources>
|
||||
133
src/listeditor/listeditor.ui
Normal file
133
src/listeditor/listeditor.ui
Normal file
|
|
@ -0,0 +1,133 @@
|
|||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<interface>
|
||||
<template class="LeWindow" parent="GtkApplicationWindow">
|
||||
<property name="title">list editor</property>
|
||||
<property name="default-width">600</property>
|
||||
<property name="default-height">400</property>
|
||||
<child>
|
||||
<object class="GtkBox">
|
||||
<property name="orientation">GTK_ORIENTATION_VERTICAL</property>
|
||||
<child>
|
||||
<object class="GtkBox">
|
||||
<property name="orientation">GTK_ORIENTATION_HORIZONTAL</property>
|
||||
<child>
|
||||
<object class="GtkLabel">
|
||||
<property name="width-chars">10</property>
|
||||
</object>
|
||||
</child>
|
||||
<child>
|
||||
<object class="GtkLabel" id="position_label">
|
||||
<property name="width-chars">8</property>
|
||||
</object>
|
||||
</child>
|
||||
<child>
|
||||
<object class="GtkButton">
|
||||
<property name="label">Append</property>
|
||||
<signal name="clicked" handler="app_cb" swapped="false" object="LeWindow"></signal>
|
||||
</object>
|
||||
</child>
|
||||
<child>
|
||||
<object class="GtkButton">
|
||||
<property name="label">Insert</property>
|
||||
<signal name="clicked" handler="ins_cb" swapped="false" object="LeWindow"></signal>
|
||||
</object>
|
||||
</child>
|
||||
<child>
|
||||
<object class="GtkButton">
|
||||
<property name="label">Remove</property>
|
||||
<signal name="clicked" handler="rm_cb" swapped="false" object="LeWindow"></signal>
|
||||
</object>
|
||||
</child>
|
||||
<child>
|
||||
<object class="GtkLabel">
|
||||
<property name="width-chars">10</property>
|
||||
</object>
|
||||
</child>
|
||||
<child>
|
||||
<object class="GtkButton">
|
||||
<property name="label">Read</property>
|
||||
<signal name="clicked" handler="read_cb" swapped="false" object="LeWindow"></signal>
|
||||
</object>
|
||||
</child>
|
||||
<child>
|
||||
<object class="GtkButton">
|
||||
<property name="label">Write</property>
|
||||
<signal name="clicked" handler="write_cb" swapped="false" object="LeWindow"></signal>
|
||||
</object>
|
||||
</child>
|
||||
<child>
|
||||
<object class="GtkLabel" id="filename">
|
||||
<property name="width-chars">10</property>
|
||||
<property name='ellipsize'>PANGO_ELLIPSIZE_END</property>"
|
||||
</object>
|
||||
</child>
|
||||
<child>
|
||||
<object class="GtkButton">
|
||||
<property name="label">Close</property>
|
||||
<signal name="clicked" handler="close_cb" swapped="false" object="LeWindow"></signal>
|
||||
</object>
|
||||
</child>
|
||||
<child>
|
||||
<object class="GtkButton">
|
||||
<property name="label">Quit</property>
|
||||
<signal name="clicked" handler="quit_cb" swapped="false" object="LeWindow"></signal>
|
||||
</object>
|
||||
</child>
|
||||
<child>
|
||||
<object class="GtkLabel">
|
||||
<property name="hexpand">TRUE</property>
|
||||
</object>
|
||||
</child>
|
||||
</object>
|
||||
</child>
|
||||
<child>
|
||||
<object class="GtkScrolledWindow">
|
||||
<property name="hexpand">TRUE</property>
|
||||
<property name="vexpand">TRUE</property>
|
||||
<child>
|
||||
<object class="GtkColumnView" id="columnview">
|
||||
<property name="hexpand">TRUE</property>
|
||||
<property name="vexpand">TRUE</property>
|
||||
<property name="focusable">FALSE</property>
|
||||
<property name="model">
|
||||
<object class="GtkNoSelection">
|
||||
<property name="model">
|
||||
<object class="GListStore" id="liststore">
|
||||
<property name="item-type">LeData</property>
|
||||
</object>
|
||||
</property>
|
||||
</object>
|
||||
</property>
|
||||
<child>
|
||||
<object class="GtkColumnViewColumn">
|
||||
<property name="title">Select</property>
|
||||
<property name="factory">
|
||||
<object class="GtkSignalListItemFactory">
|
||||
<signal name="setup" handler="setup1_cb"></signal>
|
||||
<signal name="bind" handler="bind1_cb"></signal>
|
||||
<signal name="unbind" handler="unbind1_cb"></signal>
|
||||
</object>
|
||||
</property>
|
||||
</object>
|
||||
</child>
|
||||
<child>
|
||||
<object class="GtkColumnViewColumn">
|
||||
<property name="title">String</property>
|
||||
<property name="factory">
|
||||
<object class="GtkSignalListItemFactory">
|
||||
<signal name="setup" handler="setup2_cb"></signal>
|
||||
<signal name="bind" handler="bind2_cb"></signal>
|
||||
<signal name="unbind" handler="unbind2_cb"></signal>
|
||||
</object>
|
||||
</property>
|
||||
</object>
|
||||
</child>
|
||||
</object>
|
||||
</child>
|
||||
</object>
|
||||
</child>
|
||||
</object>
|
||||
</child>
|
||||
</template>
|
||||
</interface>
|
||||
|
||||
11
src/listeditor/meson.build
Normal file
11
src/listeditor/meson.build
Normal file
|
|
@ -0,0 +1,11 @@
|
|||
project('csv', 'c')
|
||||
|
||||
glibdep = dependency('glib-2.0', version: '>=2.68.0')
|
||||
gtkdep = dependency('gtk4', version: '>=4.8')
|
||||
|
||||
gnome=import('gnome')
|
||||
resources = gnome.compile_resources('resources','listeditor.gresource.xml')
|
||||
|
||||
#sourcefiles=files('listeditor.c', 'tcsvapplication.c')
|
||||
|
||||
executable('listeditor', ['listeditor.c'], resources, dependencies: gtkdep, export_dynamic: true, install: false)
|
||||
212
src/sec30.src.md
Normal file
212
src/sec30.src.md
Normal file
|
|
@ -0,0 +1,212 @@
|
|||
# GtkSignalListItemFactory
|
||||
|
||||
## GtkSignalListItemFactory and GtkBulderListItemFactory
|
||||
|
||||
GtkBuilderlistItemFactory is convenient when GtkListView just shows the contents of a list.
|
||||
Its binding direction is always from an item of a list to a child of GtkListItem.
|
||||
|
||||
When it comes to dynamic connection, it's not enough.
|
||||
For example, you want to edit the contents of a list.
|
||||
You set a child of GtkListItem to a GtkText instance so a user can edit a text with it.
|
||||
You need to bind an item in the list with the buffer of the GtkText.
|
||||
The direction is opposite from the one with GtkBuilderListItemFactory.
|
||||
It is from the GtkText instance to the item in the list.
|
||||
You can implement this with GtkSignalListItemFactory, which is more flexible than GtkBuilderListItemFactory.
|
||||
|
||||
Two things are shown in this section.
|
||||
|
||||
- Binding from a child of a GtkListItem instance to an item of a list.
|
||||
- Access a child of GtkListItem dynamically.
|
||||
This direction is the same as the one with GtkBulderListItemFactory.
|
||||
But GtkBulderListItemFactory uses GtkExpression from the item property of the GtkListItem.
|
||||
So, it updates its child widget only when the item property changes.
|
||||
In this example the child reflects the change in the same item in the list dynamically.
|
||||
|
||||
This section shows just a part of the source file `listeditor.c`.
|
||||
If you want to see the whole codes, see `src/listeditor` directory of the [Gtk4 tutorial repository](https://github.com/ToshioCP/Gtk4-tutorial).
|
||||
|
||||
## A list editor
|
||||
|
||||
The sample program is a list editor and data of the list are strings.
|
||||
It's the same as a line editor.
|
||||
It reads a text file line by line.
|
||||
Each line is an item of the list.
|
||||
The list is displayed with GtkColumnView.
|
||||
There are two columns.
|
||||
The one is a button, which makes the line be a current line.
|
||||
If the line is the current line, the button is colored with red.
|
||||
The other is a string which is the contents of the corresponding item of the list.
|
||||
|
||||
{width=12cm height=9cm}
|
||||
|
||||
The source files are located at `src/listeditor` directory.
|
||||
You can compile end execute it as follows.
|
||||
|
||||
- Download the program from the [repository](https://github.com/ToshioCP/Gtk4-tutorial).
|
||||
- Change your current directory to `src/listeditor`.
|
||||
- Type the following on your commandline.
|
||||
|
||||
~~~
|
||||
$ meson _build
|
||||
$ ninja -C _build
|
||||
$ _build/listeditor
|
||||
~~~
|
||||
|
||||
- Append button: appends a line after the current line, or at the last line if no current line exists.
|
||||
- Insert button: inserts a line before the current line.
|
||||
- Remove button: removes a current line.
|
||||
- Read button: reads a file.
|
||||
- Write button: writes the contents to a file.
|
||||
- close button: close the contents.
|
||||
- quit button: quit the application.
|
||||
- Button on the select column: makes the line current.
|
||||
- String column: GtkText. You can edit a string in the field.
|
||||
|
||||
The current line number (zero-based) is shown at the left of the tool bar.
|
||||
The file name is shown at the right of the write button.
|
||||
|
||||
## Connect a GtkText instance and an item in the list
|
||||
|
||||
The second column (GtkColumnViewColumn) sets its factory property to GtkSignalListItemFactory.
|
||||
It uses three signals setup, bind and unbind.
|
||||
The following is their sgnal handlers.
|
||||
|
||||
@@@include
|
||||
listeditor/listeditor.c setup2_cb bind2_cb unbind2_cb
|
||||
@@@
|
||||
|
||||
- 1-5: `setup2_cb` is a setup signal handler on the GtkSignalListItemFactory.
|
||||
This factory is inserted to the factory property of the second GtkColumnViewColumn.
|
||||
Te handler just creates a GtkText instance and sets the child of `listitem` to it.
|
||||
The instance will be destroyed automatically when the `listitem` is destroyed.
|
||||
So, teardown signal handler isn't necessary.
|
||||
- 7-18: `bind2_cb` is a bind signal handler.
|
||||
It is called when the `listitem` is bound to an item in the list.
|
||||
The list items are LeData instances.
|
||||
LeData is defined in the file `listeditor.c` (the C source file of the list editor).
|
||||
It is a child class of GObject and has two data.
|
||||
The one is `listitem` which points a GtkListItem instance when they are connected.
|
||||
If no GtkListItem is connected, it is NULL.
|
||||
The other is `string` which is a content of the line.
|
||||
- 9-10: `text` is a child of the `listitem` and it is a GtkText instance.
|
||||
`data` is an item pointed by the `listitem`. It is a LeData instance.
|
||||
- 14: Gets the buffer of the `text`.
|
||||
- 15: Sets the text of the buffer to `le_data_look_string (data)`.
|
||||
le\_data\_look\_string returns the string of the data and the ownership of the string is taken by the `data`.
|
||||
So, the caller don't need to free the string.
|
||||
- 16: `g_object_bind_property` binds a property and another object property.
|
||||
This line binds the "text" property of the `buffer` (source) and the "string" property of the `data` (destination).
|
||||
It is a uni-directional binding (`G_BINDING_DEFAULT`).
|
||||
When a user changes the GtkText text, the same string is immediately put into the `data`.
|
||||
The function returns a GBinding instance.
|
||||
This binding is different from bindings of GtkExpression.
|
||||
This binding needs the existence of the two properties.
|
||||
- 17: GObjec has a table.
|
||||
The key is a string (or GQuark) and the value is a gpointer (pointer to any type).
|
||||
The function `g_object_set_data` sets the association from the key to the value.
|
||||
This line sets the association from "bind" to `bind` instance on the `listitem` instance.
|
||||
It makes possible for the "unbind" handler to get the `bind` instance.
|
||||
- 20-26: `unbind2_cb` is a unbind signal handler.
|
||||
- 22: Retrieves the `bind` instance from the table in the `listitem` instance.
|
||||
- 24: Unbind the binding.
|
||||
- 25: Removes the value corresponds to the "bind" key.
|
||||
|
||||
This technique is not so complicated.
|
||||
You can use it when you make a cell editable application.
|
||||
|
||||
## Change the cell of GtkColumnView dynamically
|
||||
|
||||
Next topic is to change the GtkColumnView (or GtkListView) cells dynamically.
|
||||
The example changes the color of the buttons, which are children of GtkListItem instances, as the current line position moves.
|
||||
|
||||
The line editor has the current position of the list.
|
||||
|
||||
- At first, no line is current.
|
||||
- When a line is appended or inserted, the line is current.
|
||||
- When the current line is deleted, no line will be current.
|
||||
- When a button in the first column of GtkColumnView is clicked, the line will be current.
|
||||
|
||||
The button of the current line is colored with red and otherwise white.
|
||||
|
||||
The current line has no relationship to GtkSingleSelection object.
|
||||
GtkSingleSelection selects a line on the display.
|
||||
The current line doesn't need to be on the display.
|
||||
It is possible to be on the line out of the Window (GtkScrolledWindow).
|
||||
Actually, the program doesn't use GtkSingleSelection.
|
||||
|
||||
It is necessary to know the corresponding GtkListItem instance from the item in the list.
|
||||
It is the opposite direction from `gtk_list_item_get_item` function.
|
||||
To accomplish this, we set a `listitem` element of LeData to point the corresponding GtkListItem instance.
|
||||
Therefore, items (LeData) in the list always know the GtkListItem.
|
||||
If there's no GtkListItem binded to the item, NULL is assigned.
|
||||
|
||||
@@@include
|
||||
listeditor/listeditor.c select_cb setup1_cb bind1_cb unbind1_cb
|
||||
@@@
|
||||
|
||||
- 8-13: `setup1_cb` is a setup signal handler on the GtkSignalListItemFactory.
|
||||
This factory is inserted to the factory property of the first GtkColumnViewColumn.
|
||||
It sets the child of `listitem` to a newly created GtkButton instance.
|
||||
The "clicked" signal on the button is connected to the handler `select_cb`.
|
||||
When the listitem is destroyed, the child (GtkButton) is also destroyed.
|
||||
At the same time, the connection of the signal and handler is also destroyed.
|
||||
So, you don't need teardown signal handler.
|
||||
- 1-6: `select_cb` is a "clicked" signal handler.
|
||||
LeWindow is defined in `listeditor.c`.
|
||||
It's a child class of GtkApplicationWindow.
|
||||
The handler just calls the `update_current` function.
|
||||
The function will be explained later.
|
||||
- 15-20: `bind1_cb` is a bind signal handler.
|
||||
It sets the "listitem" element of the item (LeData) to point the `listitem` (GtkListItem instance).
|
||||
It makes the item possible to find the corresponding GtkListItem instance.
|
||||
- 22-27: `unbind1_cb` is an unbind signal handler.
|
||||
It removes the `listitem` instance from the "listitem" element of the item.
|
||||
The element becomes NULL, which tells no GtkListItem is bound.
|
||||
When referring GtkListItem, it needs to check the "listitem" element whether it points a GtkListItem or not (NULL).
|
||||
Otherwise bad things will happen.
|
||||
|
||||
@@@include
|
||||
listeditor/listeditor.c update_current
|
||||
@@@
|
||||
|
||||
|
||||
The function `update_current` does several things.
|
||||
|
||||
- It has two parameters.
|
||||
The first one is `win`, which is an instance of LeWindow class.
|
||||
It has some elements.
|
||||
- win->position: an Integer. it is the current position. If no current line exists, it is -1.
|
||||
- win->position_label: GtkLabel. It shows the current position.
|
||||
- The second parameter is `new`, which is the new current position.
|
||||
At the beginning of the function, win->position points the old position.
|
||||
- 10-16: Update the text of GtkLabel.
|
||||
- 18-26: If the old position (win->position) is not negative, the current line exists.
|
||||
It gets a GtkListItem instance via the item (LeData) of the list.
|
||||
And it gets the GtkButton instance which is the child of the GtkListItem.
|
||||
It clears the "css-classes" property of the button.
|
||||
- 27: Updates win->position.
|
||||
- 28-36: If the new position is not negative (It's possible to be negative when the current line has been removed), the current line exists.
|
||||
It sets the "css-classes" property of the button to `{"current", NULL}`.
|
||||
It is a NULL-terminated array of strings.
|
||||
Each string is a CSS class.
|
||||
Now the button has "current" style class.
|
||||
|
||||
The color of buttons are determined by the "background" CSS style.
|
||||
The following CSS is applied to the default GdkDisplay in advance (in the startup handler of the application).
|
||||
|
||||
~~~css
|
||||
columnview listview row button.current {background: red;}
|
||||
~~~
|
||||
|
||||
The selectors "columnview listview row" is needed before "button" selector.
|
||||
Otherwise the buttons in the GtkColumnview won't be found.
|
||||
The button selector has "current" class.
|
||||
So, the only "current" class button is colored with red.
|
||||
Other buttons are not colored, which means they are white.
|
||||
|
||||
## Gtk\_widget\_dispose\_template function
|
||||
|
||||
The function `gtk_widget_dispose_template` clears the template children for the given widget.
|
||||
This is the opposite of `gtk_widget_init_template()`.
|
||||
It is a new function of GTK 4.8 version.
|
||||
If your GTK version is lower than 4.8, you need to modify the program.
|
||||
|
|
@ -10,7 +10,7 @@ struct _TfeApplication {
|
|||
GtkCssProvider *provider;
|
||||
};
|
||||
|
||||
G_DEFINE_TYPE (TfeApplication, tfe_application, GTK_TYPE_APPLICATION);
|
||||
G_DEFINE_TYPE (TfeApplication, tfe_application, GTK_TYPE_APPLICATION)
|
||||
|
||||
/* gsettings changed::font signal handler */
|
||||
static void
|
||||
|
|
|
|||
Loading…
Reference in a new issue