[gtkmm] demo: Add Stack demo

[Juan R. Garcia Blanco <juanrgar src gnome org>]

commit 3ee85fe263375dc3ceea5aeb72246122ec77dcb4
Author: Juan R. García Blanco <juanrgar gmail com>
Date:   Sun Jul 13 18:54:17 2014 +0200

    demo: Add Stack demo
    
        * demos/Makefile.am: Add gtk-demo/example_stack.cc.
        * demos/gtk-demo/demos.h: Declare do_stack(); add new entry in
        testgtk_demos.
        * demos/gtk-demo/example_stack.cc: New file.

 demos/Makefile.am               |    1 +
 demos/gtk-demo/demos.h          |    2 +
 demos/gtk-demo/example_stack.cc |   73 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 76 insertions(+), 0 deletions(-)
---
diff --git a/demos/Makefile.am b/demos/Makefile.am
index 8944c23..24554ac 100644
--- a/demos/Makefile.am
+++ b/demos/Makefile.am
@@ -44,6 +44,7 @@ gtk_demo_gtkmm_demo_SOURCES =                         \
        gtk-demo/example_panes.cc                       \
        gtk-demo/example_pixbufs.cc                     \
        gtk-demo/example_sizegroup.cc                   \
+       gtk-demo/example_stack.cc                       \
        gtk-demo/example_textview.cc                    \
        gtk-demo/example_treeview_editable_cells.cc     \
        gtk-demo/example_treeview_liststore.cc          \
diff --git a/demos/gtk-demo/demos.h b/demos/gtk-demo/demos.h
index 7e96a4f..5e029fe 100644
--- a/demos/gtk-demo/demos.h
+++ b/demos/gtk-demo/demos.h
@@ -34,6 +34,7 @@ Gtk::Window* do_overlay();
 Gtk::Window* do_pixbufs();
 Gtk::Window* do_panes();
 Gtk::Window* do_sizegroup();
+Gtk::Window* do_stack();
 Gtk::Window* do_textview();
 
 Gtk::Window* do_treeview_editable_cells();
@@ -69,6 +70,7 @@ Demo testgtk_demos[] =
   { "Paned Widgets", "example_panes.cc", sigc::ptr_fun(&do_panes), 0 },
   { "Pixbufs", "example_pixbufs.cc", sigc::ptr_fun(&do_pixbufs), 0 },
   { "Size Groups", "example_sizegroup.cc", sigc::ptr_fun(&do_sizegroup), 0 },
+  { "Stack", "example_stack.cc", sigc::ptr_fun(&do_stack), 0 },
   { "Text Widget", "example_textview.cc", sigc::ptr_fun(&do_textview), 0 },
   { "Tree View", "", type_slotDo(), child0 },
   { 0, 0, type_slotDo(), 0 }
diff --git a/demos/gtk-demo/example_stack.cc b/demos/gtk-demo/example_stack.cc
new file mode 100644
index 0000000..09ac84c
--- /dev/null
+++ b/demos/gtk-demo/example_stack.cc
@@ -0,0 +1,73 @@
+/* Stack
+ *
+ * Gtk::Stack is a container that shows a single child at a time,
+ * with nice transitions when the visible child changes.
+ *
+ * Gtk::StackSwitcher adds buttons to control which child is visible.
+ */
+
+#include "gtkmm.h"
+
+class Example_Stack : public Gtk::Window
+{
+public:
+  Example_Stack();
+  virtual ~Example_Stack();
+
+protected:
+
+  // Containers
+  Gtk::Grid m_grid;
+  Gtk::Stack m_stack;
+
+  // Widgets
+  Gtk::StackSwitcher m_stack_switcher;
+  Gtk::Image m_image;
+  Gtk::CheckButton m_check_button;
+  Gtk::Spinner m_spinner;
+
+private:
+};
+
+//Called by DemoWindow;
+Gtk::Window* do_stack()
+{
+  return new Example_Stack();
+}
+
+Example_Stack::Example_Stack()
+{
+  // Window properties
+  set_title("Stack");
+
+  // Build stack
+  m_stack.add(m_image, "page1", "Page 1");
+  m_stack.add(m_check_button, "page2", "Page 2");
+  m_stack.add(m_spinner, "page3");
+
+  // Page 1
+  m_image.set_from_icon_name("gtk3-demo", Gtk::ICON_SIZE_DIALOG);
+
+  // Page 2
+  m_check_button.set_label("Page 2");
+  m_check_button.set_halign(Gtk::ALIGN_CENTER);
+
+  // Page 3
+  m_stack.child_property_icon_name(m_spinner) = "face-laugh-symbolic";
+  m_spinner.property_active() = true;
+
+  // Stack transition
+  m_stack.set_transition_type(Gtk::STACK_TRANSITION_TYPE_CROSSFADE);
+
+  // Layout
+  m_stack_switcher.set_stack(m_stack);
+  m_grid.attach(m_stack_switcher, 0, 0, 1, 1);
+  m_grid.attach(m_stack, 0, 1, 1, 1);
+  add(m_grid);
+
+  show_all_children();
+}
+
+Example_Stack::~Example_Stack()
+{
+}