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973 lines
34 KiB
Markdown
973 lines
34 KiB
Markdown
Up: [README.md](../README.md), Prev: [Section 20](sec20.md), Next: [Section 22](sec22.md)
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# Template XML and composite widget
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The tfe program in the previous section is not so good because many things are crammed into `tfepplication.c`.
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And many static variables in `tfepplication.c`.
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The file `tfeapplication.c` should be divided into several files.
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- `tfeapplication.c` only has codes related to the application.
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- A file for the main window
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- A file for a preference dialog
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- A file for an alert dialog
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The preference dialog is defined by a ui file.
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And it has GtkBox, GtkLabel and GtkFontButton in it.
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Such widget can be defined as a composite widget.
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Composite widget is:
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- a child object (not child widget) of a widget.
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For example, the preference composite widget is a child object of GtkDialog.
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- Composite widget can be built from template XML.
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The widget is defined with template tag, not object tag.
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Next subsection shows how to build a preference dialog.
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## Preference dialog
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First, write a template XML file.
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~~~xml
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1 <?xml version="1.0" encoding="UTF-8"?>
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2 <interface>
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3 <template class="TfePref" parent="GtkDialog">
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4 <property name="title">Preferences</property>
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5 <property name="resizable">FALSE</property>
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6 <property name="modal">TRUE</property>
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7 <child internal-child="content_area">
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8 <object class="GtkBox" id="content_area">
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9 <child>
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10 <object class="GtkBox" id="pref_boxh">
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11 <property name="orientation">GTK_ORIENTATION_HORIZONTAL</property>
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12 <property name="spacing">12</property>
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13 <property name="margin-start">12</property>
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14 <property name="margin-end">12</property>
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15 <property name="margin-top">12</property>
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16 <property name="margin-bottom">12</property>
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17 <child>
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18 <object class="GtkLabel" id="fontlabel">
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19 <property name="label">Font:</property>
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20 <property name="xalign">1</property>
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21 </object>
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22 </child>
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23 <child>
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24 <object class="GtkFontButton" id="fontbtn">
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25 </object>
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26 </child>
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27 </object>
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28 </child>
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29 </object>
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30 </child>
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31 </template>
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32 </interface>
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33
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~~~
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Template tag specifies a composite widget.
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The value of a class attribute is the object name.
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It is "TfePref".
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A parent attribute specifies the direct parent class of the composite widget.
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Therefore. `TfePref` is a child class of `GtkDialog`.
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A parent attribute is optional.
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But it is recommended to specify it.
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Other lines are the same as before.
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The class `TfePref` is defined like TfeTextView.
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There are two files `tfepref.h` and `tfepref.c`.
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The file `tfepref.h` defines types and declares public functions.
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The definitions are public and open to any C files.
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~~~C
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1 #ifndef __TFE_PREF_H__
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2 #define __TFE_PREF_H__
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3
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4 #include <gtk/gtk.h>
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5
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6 #define TFE_TYPE_PREF tfe_pref_get_type ()
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7 G_DECLARE_FINAL_TYPE (TfePref, tfe_pref, TFE, PREF, GtkDialog)
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8
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9 GtkWidget *
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10 tfe_pref_new (void);
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11
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12 #endif /* __TFE_PREF_H__ */
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13
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~~~
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- 6: Defines a type `TFE_TYPE_PREF`, which is a macro replaced by `tfe_pref_get_type ()`.
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- 7: The macro `G_DECLAER_FINAL_TYPE` expands to:
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- The function `tfe_pref_get_type ()` is declared.
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- TfePrep type is defined as a typedef of `struct _TfePrep`.
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- TfePrepClass type is defined as a typedef of `struct {GtkDialogClass *parent;}`.
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- Two functions `TFE_PREF ()` and `TFE_IS_PREF ()` is defined.
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- 9-10: `tfe_pref_new` creates a new TfePref object.
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The file `tfepref.c` includes:
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- `struct _TfePrep` structure
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- `G_DEFINE_TYPE` macro
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- Initialize and dispose functions
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- public functions
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~~~C
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1 #include <gtk/gtk.h>
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2 #include "tfepref.h"
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3
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4 struct _TfePref
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5 {
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6 GtkDialog parent;
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7 GSettings *settings;
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8 GtkFontButton *fontbtn;
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9 };
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10
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11 G_DEFINE_TYPE (TfePref, tfe_pref, GTK_TYPE_DIALOG);
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12
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13 static void
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14 tfe_pref_dispose (GObject *gobject) {
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15 TfePref *pref = TFE_PREF (gobject);
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16
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17 g_clear_object (&pref->settings);
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18 G_OBJECT_CLASS (tfe_pref_parent_class)->dispose (gobject);
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19 }
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20
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21 static void
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22 tfe_pref_init (TfePref *pref) {
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23 gtk_widget_init_template (GTK_WIDGET (pref));
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24 pref->settings = g_settings_new ("com.github.ToshioCP.tfe");
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25 g_settings_bind (pref->settings, "font", pref->fontbtn, "font", G_SETTINGS_BIND_DEFAULT);
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26 }
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27
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28 static void
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29 tfe_pref_class_init (TfePrefClass *class) {
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30 GObjectClass *object_class = G_OBJECT_CLASS (class);
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31
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32 object_class->dispose = tfe_pref_dispose;
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33 gtk_widget_class_set_template_from_resource (GTK_WIDGET_CLASS (class), "/com/github/ToshioCP/tfe/tfepref.ui");
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34 gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class), TfePref, fontbtn);
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35 }
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36
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37 GtkWidget *
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38 tfe_pref_new (void) {
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39 return GTK_WIDGET (g_object_new (TFE_TYPE_PREF, NULL));
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40 }
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41
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~~~
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- 4-9: The structure `struct _TfePref` is defined.
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Every TfePref instance has its own data of the structure.
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The structure has references to:
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- a GSettings instance
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- a FontButton instance
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- 11: `G_DEFINE_TYPE` macro.
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The macro expands to:
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- the declaration of the class initialization function `tfe_pref_class_init`
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- the declaration of the instance initialization function `tfe_pref_init`
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- a static variable `tfe_pref_parent_class` that points the parent class (GtkDialogClass) structure.
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- a definition of `tfe_pref_get_type ()` function
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- 13-19: `tfe_pref_dispose` function.
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It is called in the destruction process and releases all the reference to other objects.
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For further information about destruction process, refer to [Section 11](sec11.md).
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- 17: g\_clear\_object is often used in dispose handlers. `g_clear_object (&pref->gsettings)` does:
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- `g_object_unref (pref->gsettings)`
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- `pref->settings = NULL`
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- 21-26: Instance initialization function.
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The argument `pref` points a newly created TfePref instance.
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- 23: The function `gtk_widget_init_template` creates and initializes the child widgets.
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The widgets are created based on the template which is created in the `gtk_widget_class_set_template_from_resource` function.
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- 24: Creates GSettings instance and assigns the pointer to it into `pref->settings`.
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The instance refers to a GSetting id `com.github.ToshioCP.tfe`.
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- 25: Binds the GSettings data `font` and the `font` property of `pref->fontbtn` (GtkFontButton).
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The element `pref->fontbtn` points the GtkFontButton, which is the instance of `fontbtn` in the ui file.
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The relation was made by the `gtk_widget_class_bind_template_child` function.
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- 28-35: Class initialization function.
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- 32: Sets the dispose handler.
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- 33: `gtk_widget_class_set_template_from_resource` function associates the description in the XML file (`tfepref.ui`) with the widget.
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At this moment no instance is created.
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It just makes the class recognize the structure of the object.
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That's why the top level tag is not `<object>` but `<template>` in the XML file.
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The instance will be created in the `gtk_widget_init_template` function later.
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- 34: `gtk_widget_class_bind_template_child` macro binds the structure member (`fontbtn` in `struct _TfePref`) and the id `fontbtn` in the XML file.
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The two names must be the same.
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This binding is between the member and the template (not an instance).
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- 37-40: The function `tfe_pref_new` creates a TfePref instance.
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Now, It is very simple to use this dialog.
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A caller just creates this object and shows it.
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~~~C
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TfePref *pref;
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pref = tfe_pref_new ();
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gtk_window_set_transient_for (GTK_WINDOW (pref), win); /* win is the main window */
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gtk_window_present (GTK_WINDOW (pref));
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~~~
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This instance is automatically destroyed when a user clicks on the close button.
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That's all.
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If you want to show the dialog again, just create and show it.
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## Alert dialog
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It is almost same as preference dialog.
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Its ui file is:
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~~~xml
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1 <?xml version="1.0" encoding="UTF-8"?>
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2 <interface>
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3 <template class="TfeAlert" parent="GtkDialog">
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4 <property name="title">Are you sure?</property>
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5 <property name="resizable">FALSE</property>
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6 <property name="modal">TRUE</property>
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7 <child internal-child="content_area">
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8 <object class="GtkBox">
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9 <child>
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10 <object class="GtkBox">
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11 <property name="orientation">GTK_ORIENTATION_HORIZONTAL</property>
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12 <property name="spacing">12</property>
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13 <property name="margin-start">12</property>
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14 <property name="margin-end">12</property>
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15 <property name="margin-top">12</property>
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16 <property name="margin-bottom">12</property>
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17 <child>
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18 <object class="GtkImage">
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19 <property name="icon-name">dialog-warning</property>
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20 <property name="icon-size">GTK_ICON_SIZE_LARGE</property>
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21 </object>
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22 </child>
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23 <child>
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24 <object class="GtkLabel" id="lb_alert">
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25 </object>
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26 </child>
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27 </object>
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28 </child>
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29 </object>
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30 </child>
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31 <child type="action">
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32 <object class="GtkButton" id="btn_cancel">
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33 <property name="label">Cancel</property>
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34 </object>
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35 </child>
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36 <child type="action">
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37 <object class="GtkButton" id="btn_accept">
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38 <property name="label">Close</property>
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39 </object>
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40 </child>
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41 <action-widgets>
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42 <action-widget response="cancel" default="true">btn_cancel</action-widget>
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43 <action-widget response="accept">btn_accept</action-widget>
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44 </action-widgets>
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45 </template>
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46 </interface>
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47
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~~~
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The header file is:
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~~~C
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1 #ifndef __TFE_ALERT_H__
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2 #define __TFE_ALERT_H__
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3
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4 #include <gtk/gtk.h>
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5
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6 #define TFE_TYPE_ALERT tfe_alert_get_type ()
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7 G_DECLARE_FINAL_TYPE (TfeAlert, tfe_alert, TFE, ALERT, GtkDialog)
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8
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9 void
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10 tfe_alert_set_message (TfeAlert *alert, const char *message);
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11
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12 void
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13 tfe_alert_set_button_label (TfeAlert *alert, const char *label);
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14
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15 GtkWidget *
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16 tfe_alert_new (void);
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17
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18 #endif /* __TFE_ALERT_H__ */
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19
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~~~
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There are three public functions.
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The functions `tfe_alert_set_message` and `tfe_alert_set_button_label` sets the label and button name of the alert dialog.
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For example, if you want to show an alert that the user tries to close without saving the content, set them like:
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~~~C
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tfe_alert_set_message (alert, "Contents aren't saved yet.\nAre you sure to close?");
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tfe_alert_set_button_label (alert, "Close");
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~~~
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The function `tfe_alert_new` creates a TfeAlert dialog.
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The C source file is:
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~~~C
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1 #include <gtk/gtk.h>
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2 #include "tfealert.h"
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3
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4 struct _TfeAlert
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5 {
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6 GtkDialog parent;
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7 GtkLabel *lb_alert;
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8 GtkButton *btn_accept;
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9 };
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10
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11 G_DEFINE_TYPE (TfeAlert, tfe_alert, GTK_TYPE_DIALOG);
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12
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13 void
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14 tfe_alert_set_message (TfeAlert *alert, const char *message) {
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15 gtk_label_set_text (alert->lb_alert, message);
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16 }
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17
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18 void
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19 tfe_alert_set_button_label (TfeAlert *alert, const char *label) {
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20 gtk_button_set_label (alert->btn_accept, label);
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21 }
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22
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23 static void
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24 tfe_alert_init (TfeAlert *alert) {
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25 gtk_widget_init_template (GTK_WIDGET (alert));
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26 }
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27
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28 static void
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29 tfe_alert_class_init (TfeAlertClass *class) {
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30 gtk_widget_class_set_template_from_resource (GTK_WIDGET_CLASS (class), "/com/github/ToshioCP/tfe/tfealert.ui");
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31 gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class), TfeAlert, lb_alert);
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32 gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class), TfeAlert, btn_accept);
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33 }
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34
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35 GtkWidget *
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36 tfe_alert_new (void) {
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37 return GTK_WIDGET (g_object_new (TFE_TYPE_ALERT, NULL));
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38 }
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39
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~~~
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The program is almost same as `tfepref.c`.
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The Usage of the alert object is as follows.
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1. Write the "response" signal handler.
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2. Create a TfeAlert object.
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3. Connect "response" signal to a handler
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4. Show the dialog
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5. In the signal handler, do something with regard to the response-id and destroy the dialog.
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## Top-level window
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`TfeWindow` is a child class of GtkApplicationWindow.
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~~~xml
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1 <?xml version="1.0" encoding="UTF-8"?>
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2 <interface>
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3 <template class="TfeWindow" parent="GtkApplicationWindow">
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4 <property name="title">file editor</property>
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5 <property name="default-width">600</property>
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6 <property name="default-height">400</property>
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7 <child>
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8 <object class="GtkBox" id="boxv">
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9 <property name="orientation">GTK_ORIENTATION_VERTICAL</property>
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10 <child>
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11 <object class="GtkBox" id="boxh">
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12 <property name="orientation">GTK_ORIENTATION_HORIZONTAL</property>
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13 <child>
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14 <object class="GtkLabel" id="dmy1">
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15 <property name="width-chars">10</property>
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16 </object>
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17 </child>
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18 <child>
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19 <object class="GtkButton" id="btno">
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20 <property name="label">Open</property>
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21 <property name="action-name">win.open</property>
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22 </object>
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23 </child>
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24 <child>
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25 <object class="GtkButton" id="btns">
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26 <property name="label">Save</property>
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27 <property name="action-name">win.save</property>
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28 </object>
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29 </child>
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30 <child>
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31 <object class="GtkLabel" id="dmy2">
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32 <property name="hexpand">TRUE</property>
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33 </object>
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34 </child>
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35 <child>
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36 <object class="GtkButton" id="btnc">
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37 <property name="label">Close</property>
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38 <property name="action-name">win.close</property>
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39 </object>
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40 </child>
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41 <child>
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42 <object class="GtkMenuButton" id="btnm">
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43 <property name="direction">down</property>
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44 <property name="halign">start</property>
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45 <property name="icon-name">open-menu-symbolic</property>
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46 </object>
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47 </child>
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48 <child>
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49 <object class="GtkLabel" id="dmy3">
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50 <property name="width-chars">10</property>
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51 </object>
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52 </child>
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53 </object>
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54 </child>
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55 <child>
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56 <object class="GtkNotebook" id="nb">
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57 <property name="scrollable">TRUE</property>
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58 <property name="hexpand">TRUE</property>
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59 <property name="vexpand">TRUE</property>
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60 </object>
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61 </child>
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62 </object>
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63 </child>
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64 </template>
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65 </interface>
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66
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~~~
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This XML file is almost same as before except template tag and "action-name" property in buttons.
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GtkButton implements GtkActionable interface, which has "action-name" property.
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If this property is set, GtkButton activates the action when it is clicked.
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For example, if an open button is clicked, "win.open" action will be activated and `open_activated` handler will be invoked.
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This action is also used by "\<Control\>o" accelerator (See `tfeapplication.c`).
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If you used "clicked" signal for the button, you would need its signal handler.
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Then, there would be two handlers:
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- a handler for the "clicked" signal on the button
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- a handler for the "activate" signal on the "win.open" action, to which "\<Control\>o" accelerator is connected
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These two handlers are almost same.
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It is inefficient.
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Connecting buttons to actions is a good way to reduce unnecessary codes.
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~~~C
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1 #ifndef __TFE_WINDOW_H__
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2 #define __TFE_WINDOW_H__
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3
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4 #include <gtk/gtk.h>
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5
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6 #define TFE_TYPE_WINDOW tfe_window_get_type ()
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7 G_DECLARE_FINAL_TYPE (TfeWindow, tfe_window, TFE, WINDOW, GtkApplicationWindow)
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8
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9 void
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10 tfe_window_notebook_page_new (TfeWindow *win);
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11
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12 void
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13 tfe_window_notebook_page_new_with_files (TfeWindow *win, GFile **files, int n_files);
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14
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15 GtkWidget *
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16 tfe_window_new (GtkApplication *app);
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17
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18 #endif /* __TFE_WINDOW_H__ */
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19
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~~~
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There are three public functions.
|
|
The function `tfe_window_notebook_page_new` creates a new notebook page.
|
|
This is a wrapper function for `notebook_page_new`.
|
|
It is called by TfeApplication object.
|
|
The function `tfe_window_notebook_page_new_with_files` creates notebook pages with a contents read from the given files.
|
|
The function `tfe_window_new` creates a TfeWindow instance.
|
|
|
|
~~~C
|
|
1 #include <gtk/gtk.h>
|
|
2 #include "tfewindow.h"
|
|
3 #include "tfenotebook.h"
|
|
4 #include "tfepref.h"
|
|
5 #include "tfealert.h"
|
|
6
|
|
7 struct _TfeWindow {
|
|
8 GtkApplicationWindow parent;
|
|
9 GtkMenuButton *btnm;
|
|
10 GtkNotebook *nb;
|
|
11 gboolean is_quit;
|
|
12 };
|
|
13
|
|
14 G_DEFINE_TYPE (TfeWindow, tfe_window, GTK_TYPE_APPLICATION_WINDOW);
|
|
15
|
|
16 /* alert response signal handler */
|
|
17 static void
|
|
18 alert_response_cb (GtkDialog *alert, int response_id, gpointer user_data) {
|
|
19 TfeWindow *win = TFE_WINDOW (user_data);
|
|
20
|
|
21 gtk_window_destroy (GTK_WINDOW (alert));
|
|
22 if (response_id == GTK_RESPONSE_ACCEPT) {
|
|
23 if (win->is_quit)
|
|
24 gtk_window_destroy(GTK_WINDOW (win));
|
|
25 else
|
|
26 notebook_page_close (win->nb);
|
|
27 }
|
|
28 }
|
|
29
|
|
30 static gboolean
|
|
31 close_request_cb (TfeWindow *win) {
|
|
32 TfeAlert *alert;
|
|
33
|
|
34 if (has_saved_all (GTK_NOTEBOOK (win->nb)))
|
|
35 return false;
|
|
36 else {
|
|
37 win->is_quit = true;
|
|
38 alert = TFE_ALERT (tfe_alert_new ());
|
|
39 gtk_window_set_transient_for (GTK_WINDOW (alert), GTK_WINDOW (win));
|
|
40 tfe_alert_set_message (alert, "Contents aren't saved yet.\nAre you sure to quit?");
|
|
41 tfe_alert_set_button_label (alert, "Quit");
|
|
42 g_signal_connect (GTK_DIALOG (alert), "response", G_CALLBACK (alert_response_cb), win);
|
|
43 gtk_window_present (GTK_WINDOW (alert));
|
|
44 return true;
|
|
45 }
|
|
46 }
|
|
47
|
|
48 /* ----- action activated handlers ----- */
|
|
49 static void
|
|
50 open_activated (GSimpleAction *action, GVariant *parameter, gpointer user_data) {
|
|
51 TfeWindow *win = TFE_WINDOW (user_data);
|
|
52
|
|
53 notebook_page_open (GTK_NOTEBOOK (win->nb));
|
|
54 }
|
|
55
|
|
56 static void
|
|
57 save_activated (GSimpleAction *action, GVariant *parameter, gpointer user_data) {
|
|
58 TfeWindow *win = TFE_WINDOW (user_data);
|
|
59
|
|
60 notebook_page_save (GTK_NOTEBOOK (win->nb));
|
|
61 }
|
|
62
|
|
63 static void
|
|
64 close_activated (GSimpleAction *action, GVariant *parameter, gpointer user_data) {
|
|
65 TfeWindow *win = TFE_WINDOW (user_data);
|
|
66 TfeAlert *alert;
|
|
67
|
|
68 if (has_saved (win->nb))
|
|
69 notebook_page_close (win->nb);
|
|
70 else {
|
|
71 win->is_quit = false;
|
|
72 alert = TFE_ALERT (tfe_alert_new ());
|
|
73 gtk_window_set_transient_for (GTK_WINDOW (alert), GTK_WINDOW (win));
|
|
74 tfe_alert_set_message (alert, "Contents aren't saved yet.\nAre you sure to close?");
|
|
75 tfe_alert_set_button_label (alert, "Close");
|
|
76 g_signal_connect (GTK_DIALOG (alert), "response", G_CALLBACK (alert_response_cb), win);
|
|
77 gtk_widget_show (GTK_WIDGET (alert));
|
|
78 }
|
|
79 }
|
|
80
|
|
81 static void
|
|
82 new_activated (GSimpleAction *action, GVariant *parameter, gpointer user_data) {
|
|
83 TfeWindow *win = TFE_WINDOW (user_data);
|
|
84
|
|
85 notebook_page_new (GTK_NOTEBOOK (win->nb));
|
|
86 }
|
|
87
|
|
88 static void
|
|
89 saveas_activated (GSimpleAction *action, GVariant *parameter, gpointer user_data) {
|
|
90 TfeWindow *win = TFE_WINDOW (user_data);
|
|
91
|
|
92 notebook_page_saveas (GTK_NOTEBOOK (win->nb));
|
|
93 }
|
|
94
|
|
95 static void
|
|
96 pref_activated (GSimpleAction *action, GVariant *parameter, gpointer user_data) {
|
|
97 TfeWindow *win = TFE_WINDOW (user_data);
|
|
98 GtkWidget *pref;
|
|
99
|
|
100 pref = tfe_pref_new ();
|
|
101 gtk_window_set_transient_for (GTK_WINDOW (pref), GTK_WINDOW (win));
|
|
102 gtk_window_present (GTK_WINDOW (pref));
|
|
103 }
|
|
104
|
|
105 static void
|
|
106 close_all_activated (GSimpleAction *action, GVariant *parameter, gpointer user_data) {
|
|
107 TfeWindow *win = TFE_WINDOW (user_data);
|
|
108
|
|
109 if (close_request_cb (win) == false)
|
|
110 gtk_window_destroy (GTK_WINDOW (win));
|
|
111 }
|
|
112
|
|
113 /* --- public functions --- */
|
|
114
|
|
115 void
|
|
116 tfe_window_notebook_page_new (TfeWindow *win) {
|
|
117 notebook_page_new (win->nb);
|
|
118 }
|
|
119
|
|
120 void
|
|
121 tfe_window_notebook_page_new_with_files (TfeWindow *win, GFile **files, int n_files) {
|
|
122 int i;
|
|
123
|
|
124 for (i = 0; i < n_files; i++)
|
|
125 notebook_page_new_with_file (win->nb, files[i]);
|
|
126 if (gtk_notebook_get_n_pages (win->nb) == 0)
|
|
127 notebook_page_new (win->nb);
|
|
128 }
|
|
129
|
|
130 static void
|
|
131 tfe_window_init (TfeWindow *win) {
|
|
132 GtkBuilder *build;
|
|
133 GMenuModel *menu;
|
|
134
|
|
135 gtk_widget_init_template (GTK_WIDGET (win));
|
|
136
|
|
137 build = gtk_builder_new_from_resource ("/com/github/ToshioCP/tfe/menu.ui");
|
|
138 menu = G_MENU_MODEL (gtk_builder_get_object (build, "menu"));
|
|
139 gtk_menu_button_set_menu_model (win->btnm, menu);
|
|
140 g_object_unref(build);
|
|
141
|
|
142 /* ----- action ----- */
|
|
143 const GActionEntry win_entries[] = {
|
|
144 { "open", open_activated, NULL, NULL, NULL },
|
|
145 { "save", save_activated, NULL, NULL, NULL },
|
|
146 { "close", close_activated, NULL, NULL, NULL },
|
|
147 { "new", new_activated, NULL, NULL, NULL },
|
|
148 { "saveas", saveas_activated, NULL, NULL, NULL },
|
|
149 { "pref", pref_activated, NULL, NULL, NULL },
|
|
150 { "close-all", close_all_activated, NULL, NULL, NULL }
|
|
151 };
|
|
152 g_action_map_add_action_entries (G_ACTION_MAP (win), win_entries, G_N_ELEMENTS (win_entries), win);
|
|
153
|
|
154 g_signal_connect (GTK_WINDOW (win), "close-request", G_CALLBACK (close_request_cb), NULL);
|
|
155 }
|
|
156
|
|
157 static void
|
|
158 tfe_window_class_init (TfeWindowClass *class) {
|
|
159 gtk_widget_class_set_template_from_resource (GTK_WIDGET_CLASS (class), "/com/github/ToshioCP/tfe/tfewindow.ui");
|
|
160 gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class), TfeWindow, btnm);
|
|
161 gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class), TfeWindow, nb);
|
|
162 }
|
|
163
|
|
164 GtkWidget *
|
|
165 tfe_window_new (GtkApplication *app) {
|
|
166 return GTK_WIDGET (g_object_new (TFE_TYPE_WINDOW, "application", app, NULL));
|
|
167 }
|
|
~~~
|
|
|
|
- 7-12: `_TfeWindow` structure.
|
|
A TfeWindow instance points the structure.
|
|
- 14: `G_DEFINE_TYPE` macro.
|
|
- 17-28: `alert_response_cb` is a call back function for the "response" signal of TfeAlert dialog.
|
|
- 21: Destroys the alert dialog.
|
|
- 22-27: If the user has clicked on the accept button, it destroys the main window or closes the current notebook page.
|
|
- 30-46: A "close-request" signal handler on the TfeWindow.
|
|
When a user clicked on the close button (top right x-shaped button), the handler is called before the window closes.
|
|
If the handler returns true, the default handler isn't called and the window doesn't close.
|
|
If the handler returns false, the default handler is called and the window closes.
|
|
- 34: If `has_saved_all` returns true, the handler returns false and the window will close.
|
|
Otherwise, it shows an alert dialog.
|
|
- 48-111: Handlers of action activated signal.
|
|
The `user_data` is a pointer to the TfeWindow instance.
|
|
- 115-128: Public functions.
|
|
- 130-155: Instance initialization function.
|
|
- 135: The function `gtk_widget_init_template` creates a child widgets and initializes them.
|
|
- 137-140: Builds and inserts `menu`. It is inserted to the menu button.
|
|
- 143-152: Creates actions and inserts them to the window.
|
|
The scope of the actions is "win".
|
|
- 154: Connects the "close-request" signal and a handler.
|
|
- 157-162: Class initialization function.
|
|
- 159: Sets the composite widget template
|
|
- 160-161: Binds private variables with child class templates.
|
|
- 164-167: `tfe_window_new`.
|
|
This function creates TfeWindow instance.
|
|
|
|
## TfeApplication
|
|
|
|
The file `tfeaplication.h` and `tfeapplication.c` are now very simple.
|
|
The following is the header file.
|
|
|
|
~~~C
|
|
1 #pragma once
|
|
2
|
|
3 #include <gtk/gtk.h>
|
|
4
|
|
5 #define TFE_TYPE_APPLICATION tfe_application_get_type ()
|
|
6 G_DECLARE_FINAL_TYPE (TfeApplication, tfe_application, TFE, APPLICATION, GtkApplication)
|
|
7
|
|
8 TfeApplication *
|
|
9 tfe_application_new (const char* application_id, GApplicationFlags flags);
|
|
~~~
|
|
|
|
- 1: `#pragma once` isn't an official pre-processor command, but widely used.
|
|
It makes the header file be read only once.
|
|
- 5-6: `TFE_TYPE_APPLICATION` is defined as the type of TfeApplication.
|
|
`G_DECLARE_FINAL_TYPE` is a macro used in the header file to define a new object.
|
|
- 8-9: The function `tfe_application_new` creates a new TfeApplication instance.
|
|
|
|
The following is `tfeapplication.c`.
|
|
It defines the application and supports:
|
|
|
|
- GSettings
|
|
- CSS
|
|
|
|
~~~C
|
|
1 #include <gtk/gtk.h>
|
|
2 #include "tfeapplication.h"
|
|
3 #include "tfewindow.h"
|
|
4 #include "pfd2css.h"
|
|
5
|
|
6 struct _TfeApplication {
|
|
7 GtkApplication parent;
|
|
8 TfeWindow *win;
|
|
9 GSettings *settings;
|
|
10 GtkCssProvider *provider;
|
|
11 };
|
|
12
|
|
13 G_DEFINE_TYPE (TfeApplication, tfe_application, GTK_TYPE_APPLICATION)
|
|
14
|
|
15 /* gsettings changed::font signal handler */
|
|
16 static void
|
|
17 changed_font_cb (GSettings *settings, char *key, gpointer user_data) {
|
|
18 TfeApplication *app = TFE_APPLICATION (user_data);
|
|
19 char *font, *s, *css;
|
|
20 PangoFontDescription *pango_font_desc;
|
|
21
|
|
22 font = g_settings_get_string (app->settings, "font");
|
|
23 pango_font_desc = pango_font_description_from_string (font);
|
|
24 g_free (font);
|
|
25 s = pfd2css (pango_font_desc); // converts Pango Font Description into CSS style string
|
|
26 css = g_strdup_printf ("textview {%s}", s);
|
|
27 gtk_css_provider_load_from_data (app->provider, css, -1);
|
|
28 g_free (s);
|
|
29 g_free (css);
|
|
30 }
|
|
31
|
|
32 /* ----- activate, open, startup handlers ----- */
|
|
33 static void
|
|
34 app_activate (GApplication *application) {
|
|
35 TfeApplication *app = TFE_APPLICATION (application);
|
|
36
|
|
37 tfe_window_notebook_page_new (app->win);
|
|
38 gtk_window_present (GTK_WINDOW (app->win));
|
|
39 }
|
|
40
|
|
41 static void
|
|
42 app_open (GApplication *application, GFile ** files, gint n_files, const gchar *hint) {
|
|
43 TfeApplication *app = TFE_APPLICATION (application);
|
|
44
|
|
45 tfe_window_notebook_page_new_with_files (app->win, files, n_files);
|
|
46 gtk_window_present (GTK_WINDOW (app->win));
|
|
47 }
|
|
48
|
|
49 static void
|
|
50 app_startup (GApplication *application) {
|
|
51 TfeApplication *app = TFE_APPLICATION (application);
|
|
52 GtkCssProvider *provider0;
|
|
53 GdkDisplay *display;
|
|
54 int i;
|
|
55
|
|
56 app->win = TFE_WINDOW (tfe_window_new (GTK_APPLICATION (app)));
|
|
57 provider0 = gtk_css_provider_new ();
|
|
58 gtk_css_provider_load_from_data (provider0, "textview {padding: 10px;}", -1);
|
|
59 display = gdk_display_get_default ();
|
|
60 gtk_style_context_add_provider_for_display (display, GTK_STYLE_PROVIDER (provider0),
|
|
61 GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
|
|
62 g_object_unref (provider0);
|
|
63 app->provider = gtk_css_provider_new ();
|
|
64 gtk_style_context_add_provider_for_display (display, GTK_STYLE_PROVIDER (app->provider),
|
|
65 GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
|
|
66 app->settings = g_settings_new ("com.github.ToshioCP.tfe");
|
|
67 g_signal_connect (app->settings, "changed::font", G_CALLBACK (changed_font_cb), app);
|
|
68 changed_font_cb(app->settings, "font", app);
|
|
69
|
|
70 /* ----- accelerator ----- */
|
|
71 struct {
|
|
72 const char *action;
|
|
73 const char *accels[2];
|
|
74 } action_accels[] = {
|
|
75 { "win.open", { "<Control>o", NULL } },
|
|
76 { "win.save", { "<Control>s", NULL } },
|
|
77 { "win.close", { "<Control>w", NULL } },
|
|
78 { "win.new", { "<Control>n", NULL } },
|
|
79 { "win.saveas", { "<Shift><Control>s", NULL } },
|
|
80 { "win.close-all", { "<Control>q", NULL } },
|
|
81 };
|
|
82
|
|
83 for (i = 0; i < G_N_ELEMENTS(action_accels); i++)
|
|
84 gtk_application_set_accels_for_action(GTK_APPLICATION(app), action_accels[i].action, action_accels[i].accels);
|
|
85 }
|
|
86
|
|
87 static void
|
|
88 tfe_application_dispose (GObject *gobject) {
|
|
89 TfeApplication *app = TFE_APPLICATION (gobject);
|
|
90
|
|
91 g_clear_object (&app->settings);
|
|
92 g_clear_object (&app->provider);
|
|
93 G_OBJECT_CLASS (tfe_application_parent_class)->dispose (gobject);
|
|
94 }
|
|
95
|
|
96 static void
|
|
97 tfe_application_init (TfeApplication *app) {
|
|
98 g_signal_connect (G_APPLICATION (app), "startup", G_CALLBACK (app_startup), NULL);
|
|
99 g_signal_connect (G_APPLICATION (app), "activate", G_CALLBACK (app_activate), NULL);
|
|
100 g_signal_connect (G_APPLICATION (app), "open", G_CALLBACK (app_open), NULL);
|
|
101 }
|
|
102
|
|
103 static void
|
|
104 tfe_application_class_init (TfeApplicationClass *class) {
|
|
105 GObjectClass *object_class = G_OBJECT_CLASS (class);
|
|
106
|
|
107 object_class->dispose = tfe_application_dispose;
|
|
108 }
|
|
109
|
|
110 TfeApplication *
|
|
111 tfe_application_new (const char* application_id, GApplicationFlags flags) {
|
|
112 return TFE_APPLICATION (g_object_new (TFE_TYPE_APPLICATION, "application-id", application_id, "flags", flags, NULL));
|
|
113 }
|
|
~~~
|
|
|
|
- 6-11: Defines `_TfeApplication` structure.
|
|
The members are:
|
|
- win: main window instance
|
|
- settings: GSettings instance.it is bound to "font" item in the GSettings
|
|
- provider: a provider for the font of the textview.
|
|
- `G_DEFINE_TYPE` macro.
|
|
- 16-30: `changed_font_cb` is a handler for "changed::font" signal on the GSettings instance.
|
|
The signal name is "changed" and "font" is a key name.
|
|
When the valeu of "font" key is changed, the signal is emitted.
|
|
So, this handler doesn't directly relate to the font button, but through the GSettings database.
|
|
A user changes the font in the font button => GSettings font key data is changed => the handler is called.
|
|
- 22-24: Retrieves a string from the GSetting database and converts it into a pango font description.
|
|
- 25-29: Sets the css provider with the font data.
|
|
The provider has been inserted to the current display in advance.
|
|
- 33-39: Activate signal handler.
|
|
It uses `tfe_window_notebook_page_new` instead of `notebook_page_new`.
|
|
- 41-47: Open signal handler.
|
|
It just calls `tfe_window_notebook_page_new_with_files` and shows the main window.
|
|
Be careful that the activate and open handlers don't create a new window.
|
|
They just create a new notebook page.
|
|
Therefore, even if the second application runs, no new window appears.
|
|
Just a new notebook page is inserted to the same main window.
|
|
- 49-85: Startup signal handler.
|
|
- 56: Creates a new window (main window) and assigns it to `app->win`.
|
|
- 57-61: Creates a css provider (`provider0`).
|
|
It includes only the padding data for the textview.
|
|
The provider is inserted to the default display.
|
|
- 63-65: Another css provider is created (`app->provider`) and inserted to the default display.
|
|
It will include the font data for the textview.
|
|
- 66-68: Creates a new GSettings instance.
|
|
If the GSettings data is changed, the "changed" signal is emitted.
|
|
The signal can have a key name like "changed::font".
|
|
This style ("changed::font") is called detailed signal.
|
|
The detailed signal is emitted only if the font data is changed.
|
|
The handler `changed_font_cb` is called to set the CSS with the font data.
|
|
The handler gets the font data from the GSettings data which is the last font in the previous run of the application.
|
|
- 71-84: Defines accelerators.
|
|
- 87-94: A dispose handler. It releases references to the instances of GSettings and GtkCssProvider.
|
|
- 96-101: An initialization for the instance.
|
|
It connects three signals (activate, open and startup) and their handlers.
|
|
- 183-188: An initialization for the class.
|
|
It overrides the dispose class method.
|
|
- 110-113: `tfe_application_new` creates a new TfeApplication instance.
|
|
The parameters are an application-id and flags.
|
|
|
|
## Other files
|
|
|
|
main.c
|
|
|
|
~~~C
|
|
1 #include <gtk/gtk.h>
|
|
2 #include "tfeapplication.h"
|
|
3
|
|
4 #define APPLICATION_ID "com.github.ToshioCP.tfe"
|
|
5
|
|
6 int
|
|
7 main (int argc, char **argv) {
|
|
8 TfeApplication *app;
|
|
9 int stat;
|
|
10
|
|
11 app = tfe_application_new (APPLICATION_ID, G_APPLICATION_HANDLES_OPEN);
|
|
12 stat =g_application_run (G_APPLICATION (app), argc, argv);
|
|
13 g_object_unref (app);
|
|
14 return stat;
|
|
15 }
|
|
16
|
|
~~~
|
|
|
|
CSS related files `pfd2css.h` and `pfd2css.c` are the same as the previous section.
|
|
|
|
Resource XML file.
|
|
|
|
~~~xml
|
|
1 <?xml version="1.0" encoding="UTF-8"?>
|
|
2 <gresources>
|
|
3 <gresource prefix="/com/github/ToshioCP/tfe">
|
|
4 <file>tfewindow.ui</file>
|
|
5 <file>tfepref.ui</file>
|
|
6 <file>tfealert.ui</file>
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7 <file>menu.ui</file>
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8 </gresource>
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9 </gresources>
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~~~
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|
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GSchema XML file
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|
|
|
~~~xml
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|
1 <?xml version="1.0" encoding="UTF-8"?>
|
|
2 <schemalist>
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|
3 <schema path="/com/github/ToshioCP/tfe/" id="com.github.ToshioCP.tfe">
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4 <key name="font" type="s">
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5 <default>'Monospace 12'</default>
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6 <summary>Font</summary>
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7 <description>A font to be used for textview.</description>
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8 </key>
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9 </schema>
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10 </schemalist>
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~~~
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|
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|
Meson.build
|
|
|
|
~~~meson
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|
1 project('tfe', 'c')
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|
2
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3 gtkdep = dependency('gtk4')
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4
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5 gnome=import('gnome')
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6 resources = gnome.compile_resources('resources','tfe.gresource.xml')
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|
7 gnome.compile_schemas(build_by_default: true, depend_files: 'com.github.ToshioCP.tfe.gschema.xml')
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|
8
|
|
9 sourcefiles=files('main.c', 'tfeapplication.c', 'tfewindow.c', 'tfenotebook.c', 'tfepref.c', 'tfealert.c', 'pfd2css.c', '../tfetextview/tfetextview.c')
|
|
10
|
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11 executable('tfe', sourcefiles, resources, dependencies: gtkdep, export_dynamic: true, install: true)
|
|
12
|
|
13 schema_dir = get_option('prefix') / get_option('datadir') / 'glib-2.0/schemas/'
|
|
14 install_data('com.github.ToshioCP.tfe.gschema.xml', install_dir: schema_dir)
|
|
15 gnome.post_install (glib_compile_schemas: true)
|
|
~~~
|
|
|
|
## Compilation and installation.
|
|
|
|
If you want to install it to your local area, use `--prefix=$HOME/.local` or `--prefix=$HOME` option.
|
|
If you want to install it to the system area, no option is needed.
|
|
It will be installed under `/user/local` directory.
|
|
|
|
~~~
|
|
$ meson --prefix=$HOME/.local _build
|
|
$ ninja -C _build
|
|
$ ninja -C _build install
|
|
~~~
|
|
|
|
You need root privilege to install it to the system area..
|
|
|
|
~~~
|
|
$ meson _build
|
|
$ ninja -C _build
|
|
$ sudo ninja -C _build install
|
|
~~~
|
|
|
|
Source files are in [src/tfe7](../src/tfe7) directory.
|
|
|
|
Composite widgets give us two advantages.
|
|
|
|
- A set of widgets is better than individual widgets because of the simple coding.
|
|
- They hold instance variables (members of the object structure) so static variables are no longer necessary.
|
|
It makes the program simpler.
|
|
|
|
We made a very small text editor.
|
|
You can add features to this editor.
|
|
When you add a new feature, be careful about the structure of the program.
|
|
Maybe you need to divide a file into several files like this section.
|
|
It isn't good to put many things into one file.
|
|
And it is important to think about the relationship between source files and widget structures.
|
|
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|
Up: [README.md](../README.md), Prev: [Section 20](sec20.md), Next: [Section 22](sec22.md)
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