manual tests: add example for composite widgets

Signed-off-by: Igor Gnatenko <i.gnatenko.brain@gmail.com>

manual tests/7 vala composite widgets/meson.build

@@ -0,0 +1,20 @@
+project('composite', 'vala', 'c')
+gnome = import('gnome')
+deps = [
+  dependency('glib-2.0', version : '>=2.38'),
+  dependency('gobject-2.0'),
+  dependency('gtk+-3.0'),
+]
+res = gnome.compile_resources(
+  'my', 'my-resources.xml',
+  source_dir : '.',
+)
+executable(
+  'demo',
+  sources : [
+    'mywidget.vala',
+    res,
+  ],
+  dependencies : deps,
+  vala_args : '--gresources=@0@/my-resources.xml'.format(meson.current_source_dir()),
+)

manual tests/7 vala composite widgets/my-resources.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<gresources>
+  <gresource prefix="/org/foo/my">
+    <file compressed="true" preprocess="xml-stripblanks">mywidget.ui</file>
+  </gresource>
+</gresources>

manual tests/7 vala composite widgets/mywidget.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <!-- interface-requires gtk+ 3.8 -->
+  <template class="MyWidget" parent="GtkBox">
+    <property name="visible">True</property>
+    <property name="can_focus">False</property>
+    <property name="orientation">vertical</property>
+    <property name="spacing">4</property>
+    <child>
+      <object class="GtkLabel" id="label1">
+        <property name="visible">True</property>
+        <property name="can_focus">False</property>
+        <property name="halign">start</property>
+        <property name="valign">start</property>
+        <property name="xalign">0</property>
+        <property name="label" translatable="yes">This widget is defined with composite GtkBuilder script</property>
+        <property name="wrap">True</property>
+      </object>
+      <packing>
+        <property name="expand">False</property>
+        <property name="fill">True</property>
+        <property name="position">0</property>
+      </packing>
+    </child>
+    <child>
+      <object class="GtkEntry" id="entry">
+        <property name="visible">True</property>
+        <property name="can_focus">True</property>
+        <property name="invisible_char">•</property>
+        <signal name="changed" handler="on_entry_changed" object="MyWidget" swapped="no"/>
+      </object>
+      <packing>
+        <property name="expand">False</property>
+        <property name="fill">True</property>
+        <property name="position">1</property>
+      </packing>
+    </child>
+    <child>
+      <object class="GtkLabel" id="label2">
+        <property name="visible">True</property>
+        <property name="can_focus">False</property>
+        <property name="halign">start</property>
+        <property name="valign">start</property>
+        <property name="xalign">0</property>
+        <property name="label" translatable="yes">Press the button to fetch the internal entry text</property>
+        <property name="wrap">True</property>
+      </object>
+      <packing>
+        <property name="expand">False</property>
+        <property name="fill">True</property>
+        <property name="position">2</property>
+      </packing>
+    </child>
+    <child>
+      <object class="GtkButton" id="button">
+        <property name="label" translatable="yes">The Button</property>
+        <property name="visible">True</property>
+        <property name="can_focus">True</property>
+        <property name="receives_default">True</property>
+        <property name="halign">end</property>
+        <signal name="clicked" handler="on_button_clicked" swapped="no"/>
+      </object>
+      <packing>
+        <property name="expand">False</property>
+        <property name="fill">True</property>
+        <property name="position">3</property>
+      </packing>
+    </child>
+  </template>
+</interface>

manual tests/7 vala composite widgets/mywidget.vala

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+using Gtk;
+
+[GtkTemplate (ui = "/org/foo/my/mywidget.ui")]
+public class MyWidget : Box {
+	public string text {
+		get { return entry.text; }
+		set { entry.text = value; }
+	}
+
+	[GtkChild]
+	private Entry entry;
+
+	public MyWidget (string text) {
+		this.text = text;
+	}
+
+	[GtkCallback]
+	private void on_button_clicked (Button button) {
+		print ("The button was clicked with entry text: %s\n", entry.text);
+	}
+
+	[GtkCallback]
+	private void on_entry_changed (Editable editable) {
+		print ("The entry text changed: %s\n", entry.text);
+
+		notify_property ("text");
+	}
+}
+
+void main(string[] args) {
+	Gtk.init (ref args);
+	var win = new Window();
+	win.destroy.connect (Gtk.main_quit);
+
+	var widget = new MyWidget ("The entry text!");
+
+	win.add (widget);
+	win.show_all ();
+
+	Gtk.main ();
+}