Bug fixed. Solve GtkText warnings.

docs/sec30.html

@@ -448,14 +448,38 @@ template children for the given widget. This is the opposite of
 version. If your GTK version is lower than 4.8, you need to modify the
 program.</p>
 <h2 id="a-waring-from-gtktext">A waring from GtkText</h2>
-<p>If the list has many items and it needs to be scrolled, a warning
+<p>If your program has the following two, a warning message can be
-message can be issued.</p>
+issued.</p>
+<ul>
+<li>The list has many items and it needs to be scrolled.</li>
+<li>A GtkText instance is the focus widget.</li>
+</ul>
 <pre><code>GtkText - unexpected blinking selection. Removing</code></pre>
-<p>I don’t have an idea why this happens. But if GtkText “focusable”
+<p>I don’t have an exact idea why this happens. But if GtkText
-property is FALSE, the warning doesn’t happen. So it probably come from
+“focusable” property is FALSE, the warning doesn’t happen. So it
-focus and scroll. If you know the reason, please let me know.</p>
+probably comes from focus and scroll.</p>
-<p>It is a warning message, not a fatal error. I think we can ignore
+<p>You can avoid this by unsetting any focus widget under the main
-it.</p>
+window. When scroll begins, the “value-changed” signal on the vertical
+adjustment of the scrolled window is emitted.</p>
+<p>The following is extracted from the ui file and C source file.</p>
+<div class="sourceCode" id="cb7"><pre
+class="sourceCode xml"><code class="sourceCode xml"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a>... ... ...</span>
+<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a>&lt;<span class="kw">object</span><span class="ot"> class=</span><span class="st">&quot;GtkScrolledWindow&quot;</span>&gt;</span>
+<span id="cb7-3"><a href="#cb7-3" aria-hidden="true" tabindex="-1"></a>  &lt;<span class="kw">property</span><span class="ot"> name=</span><span class="st">&quot;hexpand&quot;</span>&gt;TRUE&lt;/<span class="kw">property</span>&gt;</span>
+<span id="cb7-4"><a href="#cb7-4" aria-hidden="true" tabindex="-1"></a>  &lt;<span class="kw">property</span><span class="ot"> name=</span><span class="st">&quot;vexpand&quot;</span>&gt;TRUE&lt;/<span class="kw">property</span>&gt;</span>
+<span id="cb7-5"><a href="#cb7-5" aria-hidden="true" tabindex="-1"></a>  &lt;<span class="kw">property</span><span class="ot"> name=</span><span class="st">&quot;vadjustment&quot;</span>&gt;</span>
+<span id="cb7-6"><a href="#cb7-6" aria-hidden="true" tabindex="-1"></a>    &lt;<span class="kw">object</span><span class="ot"> class=</span><span class="st">&quot;GtkAdjustment&quot;</span>&gt;</span>
+<span id="cb7-7"><a href="#cb7-7" aria-hidden="true" tabindex="-1"></a>      &lt;<span class="kw">signal</span><span class="ot"> name=</span><span class="st">&quot;value-changed&quot;</span><span class="ot"> handler=</span><span class="st">&quot;adjustment_value_changed_cb&quot;</span><span class="ot"> swapped=</span><span class="st">&quot;no&quot;</span><span class="ot"> object=</span><span class="st">&quot;LeWindow&quot;</span>/&gt;</span>
+<span id="cb7-8"><a href="#cb7-8" aria-hidden="true" tabindex="-1"></a>    &lt;/<span class="kw">object</span>&gt;</span>
+<span id="cb7-9"><a href="#cb7-9" aria-hidden="true" tabindex="-1"></a>  &lt;/<span class="kw">property</span>&gt;</span>
+<span id="cb7-10"><a href="#cb7-10" aria-hidden="true" tabindex="-1"></a>... ... ...  </span></code></pre></div>
+<div class="sourceCode" id="cb8"><pre
+class="sourceCode numberSource C numberLines"><code class="sourceCode c"><span id="cb8-1"><a href="#cb8-1"></a><span class="dt">static</span> <span class="dt">void</span></span>
+<span id="cb8-2"><a href="#cb8-2"></a>adjustment_value_changed_cb <span class="op">(</span>GtkAdjustment <span class="op">*</span>adjustment<span class="op">,</span> gpointer user_data<span class="op">)</span> <span class="op">{</span></span>
+<span id="cb8-3"><a href="#cb8-3"></a>  GtkWidget <span class="op">*</span>win <span class="op">=</span> GTK_WIDGET <span class="op">(</span>user_data<span class="op">);</span></span>
+<span id="cb8-4"><a href="#cb8-4"></a></span>
+<span id="cb8-5"><a href="#cb8-5"></a>  gtk_window_set_focus <span class="op">(</span>GTK_WINDOW <span class="op">(</span>win<span class="op">),</span> NULL<span class="op">);</span></span>
+<span id="cb8-6"><a href="#cb8-6"></a><span class="op">}</span></span></code></pre></div>
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gfm/sec30.md

@@ -323,18 +323,44 @@ If your GTK version is lower than 4.8, you need to modify the program.
 
 ## A waring from GtkText
 
-If the list has many items and it needs to be scrolled, a warning message can be issued.
+If your program has the following two, a warning message can be issued.
+
+- The list has many items and it needs to be scrolled.
+- A GtkText instance is the focus widget.
 
 ~~~
 GtkText - unexpected blinking selection. Removing
 ~~~
 
-I don't have an idea why this happens.
+I don't have an exact idea why this happens.
 But if GtkText "focusable" property is FALSE, the warning doesn't happen.
-So it probably come from focus and scroll.
+So it probably comes from focus and scroll.
-If you know the reason, please let me know.
 
-It is a warning message, not a fatal error.
+You can avoid this by unsetting any focus widget under the main window.
-I think we can ignore it.
+When scroll begins, the "value-changed" signal on the vertical adjustment of the scrolled window is emitted.
+
+The following is extracted from the ui file and C source file.
+
+~~~xml
+... ... ...
+<object class="GtkScrolledWindow">
+  <property name="hexpand">TRUE</property>
+  <property name="vexpand">TRUE</property>
+  <property name="vadjustment">
+    <object class="GtkAdjustment">
+      <signal name="value-changed" handler="adjustment_value_changed_cb" swapped="no" object="LeWindow"/>
+    </object>
+  </property>
+... ... ...  
+~~~
+
+~~~C
+1 static void
+2 adjustment_value_changed_cb (GtkAdjustment *adjustment, gpointer user_data) {
+3   GtkWidget *win = GTK_WIDGET (user_data);
+4 
+5   gtk_window_set_focus (GTK_WINDOW (win), NULL);
+6 }
+~~~
 
 Up: [README.md](../README.md),  Prev: [Section 29](sec29.md)

src/listeditor/listeditor.c

@@ -218,9 +218,12 @@ ins_cb (GtkButton *btn, LeWindow *win) {
 
 static void
 rm_cb (GtkButton *btn, LeWindow *win) {
+  int position;
+
   if (win->position >= 0) {
-    g_list_store_remove (win->liststore, win->position);
+    position = win->position;
     win->position = -1;
+    g_list_store_remove (win->liststore, position);
     update_current (win, -1);
   }
 }
@@ -453,12 +456,12 @@ unbind2_cb (GtkListItemFactory *factory, GtkListItem *listitem) {
   g_object_set_data (G_OBJECT (listitem), "bind", NULL);
 }
 
-// static void
+static void
-// adjustment_value_changed_cb (GtkAdjustment *adjustment, gpointer user_data) {
+adjustment_value_changed_cb (GtkAdjustment *adjustment, gpointer user_data) {
-//   GtkWidget *win = GTK_WIDGET (user_data);
+  GtkWidget *win = GTK_WIDGET (user_data);
 
-//   gtk_widget_set_can_focus (win, FALSE);
+  gtk_window_set_focus (GTK_WINDOW (win), NULL);
-// }
+}
 
 static void
 le_window_init (LeWindow *win) {
@@ -503,7 +506,7 @@ le_window_class_init (LeWindowClass *class) {
   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);
-  // gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class), adjustment_value_changed_cb);
+  gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class), adjustment_value_changed_cb);
 }
 
 GtkWidget *

src/listeditor/listeditor.ui

@@ -84,13 +84,11 @@
           <object class="GtkScrolledWindow">
             <property name="hexpand">TRUE</property>
             <property name="vexpand">TRUE</property>
-<!--
             <property name="vadjustment">
               <object class="GtkAdjustment">
                 <signal name="value-changed" handler="adjustment_value_changed_cb" swapped="no" object="LeWindow"/>
               </object>
             </property>
--->
             <child>
               <object class="GtkColumnView" id="columnview">
                 <property name="hexpand">TRUE</property>

src/sec30.src.md

@@ -221,16 +221,37 @@ If your GTK version is lower than 4.8, you need to modify the program.
 
 ## A waring from GtkText
 
-If the list has many items and it needs to be scrolled, a warning message can be issued.
+If your program has the following two, a warning message can be issued.
+
+- The list has many items and it needs to be scrolled.
+- A GtkText instance is the focus widget.
 
 ~~~
 GtkText - unexpected blinking selection. Removing
 ~~~
 
-I don't have an idea why this happens.
+I don't have an exact idea why this happens.
 But if GtkText "focusable" property is FALSE, the warning doesn't happen.
-So it probably come from focus and scroll.
+So it probably comes from focus and scroll.
-If you know the reason, please let me know.
 
-It is a warning message, not a fatal error.
+You can avoid this by unsetting any focus widget under the main window.
-I think we can ignore it.
+When scroll begins, the "value-changed" signal on the vertical adjustment of the scrolled window is emitted.
+
+The following is extracted from the ui file and C source file.
+
+~~~xml
+... ... ...
+<object class="GtkScrolledWindow">
+  <property name="hexpand">TRUE</property>
+  <property name="vexpand">TRUE</property>
+  <property name="vadjustment">
+    <object class="GtkAdjustment">
+      <signal name="value-changed" handler="adjustment_value_changed_cb" swapped="no" object="LeWindow"/>
+    </object>
+  </property>
+... ... ...  
+~~~
+
+@@@include
+listeditor/listeditor.c adjustment_value_changed_cb
+@@@