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docs: Show examples of how to use templates API

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The template documentation is lacking inlined examples on how to use the
templates API, like binding children and callbacks. This makes looking
for best practices a bit harder than it ought to be, for a feature this
useful.
This commit is contained in:
Emmanuele Bassi 2014-06-26 19:23:52 +01:00
parent 6325e4a037
commit 5b571ff4b6
1 changed files with 80 additions and 0 deletions
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80
gtk/gtkwidget.c
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@ -360,6 +360,7 @@
* <child>
* <object class="GtkButton" id="hello_button">
* <property name="label">Hello World</property>
* <signal name="clicked" handler="hello_button_clicked" object="FooWidget" swapped="yes"/>
* </object>
* </child>
* <child>
@ -370,6 +371,85 @@
* </template>
* </interface>
* ]|
*
* Typically, you'll place the template fragment into a file that is
* bundled with your project, using #GResource. In order to load the
* template, you need to call gtk_widget_class_set_template_from_resource()
* from the class initialization of your #GtkWidget type:
*
* |[<!-- language="C" -->
* static void
* foo_widget_class_init (FooWidgetClass *klass)
* {
* // ...
*
* gtk_widget_class_set_template_from_resource (GTK_WIDGET_CLASS (klass),
* "/com/example/ui/foowidget.ui");
* }
* ]|
*
* You will also need to call gtk_widget_init_template() from the instance
* initialization function:
*
* |[<!-- language="C" -->
* static void
* foo_widget_init (FooWidget *self)
* {
* // ...
* gtk_widget_init_template (GTK_WIDGET (self));
* }
* ]|
*
* You can access widgets defined in the template using the
* gtk_widget_get_template_child() function, but you will typically declare
* a pointer in the instance private data structure of your type using the same
* name as the widget in the template definition, and call
* gtk_widget_class_bind_template_child_private() with that name, e.g.
*
* |[<!-- language="C" -->
* typedef struct {
* GtkWidget *hello_button;
* GtkWidget *goodbye_button;
* } FooWidgetPrivate;
*
* G_DEFINE_TYPE_WITH_PRIVATE (FooWidget, foo_widget, GTK_TYPE_BOX)
*
* static void
* foo_widget_class_init (FooWidgetClass *klass)
* {
* // ...
* gtk_widget_class_set_template_from_resource (GTK_WIDGET_CLASS (klass),
* "/com/example/ui/foowidget.ui");
* gtk_widget_class_bind_template_child_private (GTK_WIDGET_CLASS (klass),
* FooWidget, hello_button);
* gtk_widget_class_bind_template_child_private (GTK_WIDGET_CLASS (klass),
* FooWidget, goodbye_button);
* }
* ]|
*
* You can also use gtk_widget_class_bind_template_callback() to connect a signal
* callback defined in the template with a function visible in the scope of the
* class, e.g.
*
* |[<!-- language="C" -->
* // the signal handler has the instance and user data swapped
* // because of the swapped="yes" attribute in the template XML
* static void
* hello_button_clicked (FooWidget *self,
* GtkButton *button)
* {
* g_print ("Hello, world!\n");
* }
*
* static void
* foo_widget_class_init (FooWidgetClass *klass)
* {
* // ...
* gtk_widget_class_set_template_from_resource (GTK_WIDGET_CLASS (klass),
* "/com/example/ui/foowidget.ui");
* gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (klass), hello_button_clicked);
* }
* ]|
*/
#define GTK_STATE_FLAGS_DO_PROPAGATE (GTK_STATE_FLAG_INSENSITIVE|GTK_STATE_FLAG_BACKDROP)