Add a GtkStack example to gtk-demo

demos/gtk-demo/Makefile.am

@@ -43,6 +43,7 @@ demos =						\
 	search_entry.c				\
 	sizegroup.c				\
 	spinner.c				\
+	stack.c					\
 	stock_browser.c				\
 	textview.c				\
 	textscroll.c				\
@@ -110,6 +111,7 @@ RESOURCES=	$(demos)			\
 		application.ui			\
 		demo.ui				\
 		menus.ui			\
+		stack.ui			\
 		theming.ui			\
 		alphatest.png			\
 		apple-red.png			\

demos/gtk-demo/demo.gresource.xml

@@ -55,6 +55,9 @@
     <file preprocess="to-pixdata">gnome-fs-directory.png</file>
     <file preprocess="to-pixdata">gnome-fs-regular.png</file>
   </gresource>
+  <gresource prefix="/stack">
+    <file>stack.ui</file>
+  </gresource>
   <gresource prefix="/images">
     <file>alphatest.png</file>
     <file>floppybuddy.gif</file>
@@ -110,6 +113,7 @@
     <file>rotated_text.c</file>
     <file>search_entry.c</file>
     <file>sizegroup.c</file>
+    <file>stack.c</file>
     <file>spinner.c</file>
     <file>stock_browser.c</file>
     <file>textview.c</file>

demos/gtk-demo/stack.c

@@ -0,0 +1,48 @@
+/* Stack
+ *
+ * GtkStack is a container that shows a single child at a time,
+ * with nice transitions when the visible child changes.
+ *
+ * GtkStackSwitcher adds buttons to control which child is visible.
+ */
+
+#include <gtk/gtk.h>
+
+static GtkBuilder *builder;
+
+GtkWidget *
+do_stack (GtkWidget *do_widget)
+{
+  static GtkWidget *window = NULL;
+  GError *err = NULL;
+
+  if (!window)
+    {
+      builder = gtk_builder_new ();
+      gtk_builder_add_from_resource (builder, "/stack/stack.ui", &err);
+      if (err)
+        {
+          g_error ("ERROR: %s\n", err->message);
+          return NULL;
+        }
+      gtk_builder_connect_signals (builder, NULL);
+      window = GTK_WIDGET (gtk_builder_get_object (builder, "window1"));
+      gtk_window_set_screen (GTK_WINDOW (window),
+                             gtk_widget_get_screen (do_widget));
+      g_signal_connect (window, "destroy",
+                        G_CALLBACK (gtk_widget_destroyed), &window);
+    }
+
+  if (!gtk_widget_get_visible (window))
+    {
+      gtk_widget_show_all (window);
+    }
+  else
+    {
+      gtk_widget_destroy (window);
+      window = NULL;
+    }
+
+
+  return window;
+}

demos/gtk-demo/stack.ui

@@ -0,0 +1,82 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <!-- interface-requires gtk+ 3.6 -->
+  <object class="GtkWindow" id="window1">
+    <property name="can_focus">False</property>
+    <property name="title" translatable="yes">GtkStack</property>
+    <child>
+      <object class="GtkGrid" id="grid1">
+        <property name="visible">True</property>
+        <property name="can_focus">False</property>
+        <child>
+          <object class="GtkStackSwitcher" id="switcher">
+            <property name="visible">True</property>
+            <property name="stack">stack</property>
+            <property name="halign">center</property>
+          </object>
+          <packing>
+            <property name="left_attach">0</property>
+            <property name="top_attach">0</property>
+            <property name="width">1</property>
+            <property name="height">1</property>
+          </packing>
+        </child>
+        <child>
+          <object class="GtkStack" id="stack">
+            <property name="visible">True</property>
+            <property name="can_focus">True</property>
+            <property name="transition-type">crossfade</property>
+            <child>
+              <object class="GtkImage" id="image1">
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="margin-top">20</property>
+                <property name="margin-bottom">20</property>
+                <property name="resource">/application/gtk-logo-48.png</property>
+              </object>
+              <packing>
+                <property name="name">page1</property>
+                <property name="title" translatable="yes">Page 1</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkCheckButton" id="checkbutton1">
+                <property name="label" translatable="yes">Page 2</property>
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">False</property>
+                <property name="xalign">0</property>
+                <property name="draw_indicator">True</property>
+                <property name="halign">center</property>
+                <property name="valign">center</property>
+              </object>
+              <packing>
+                <property name="name">page2</property>
+                <property name="title" translatable="yes">Page 2</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkSpinner" id="spinner1">
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="halign">center</property>
+                <property name="valign">center</property>
+                <property name="active">True</property>
+              </object>
+              <packing>
+                <property name="name">page3</property>
+                <property name="icon-name">face-laugh-symbolic</property>
+              </packing>
+            </child>
+          </object>
+          <packing>
+            <property name="left_attach">0</property>
+            <property name="top_attach">1</property>
+            <property name="width">1</property>
+            <property name="height">1</property>
+          </packing>
+        </child>
+      </object>
+    </child>
+  </object>
+</interface>