[pyclutter] examples: Add a button-styled actor

[Emmanuele Bassi <ebassi src gnome org>]

commit f8513bf9d74d5f880aead32ea8415f991f066096
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Fri May 8 19:15:20 2015 +0100

    examples: Add a button-styled actor
    
    This should show how to integrate the GTK style system with Clutter
    actors.

 examples/clutter-gtk-style.py |   73 ++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 72 insertions(+), 1 deletions(-)
---
diff --git a/examples/clutter-gtk-style.py b/examples/clutter-gtk-style.py
index bfb7548..e04c7f5 100644
--- a/examples/clutter-gtk-style.py
+++ b/examples/clutter-gtk-style.py
@@ -8,6 +8,7 @@ except ImportError:
 
 from gi.repository import Clutter
 from gi.repository import GLib
+from gi.repository import GObject
 from gi.repository import Gtk
 
 class StyledEmbed(GtkClutter.Embed):
@@ -53,6 +54,67 @@ class StyledEmbed(GtkClutter.Embed):
         Gtk.render_background(style, cr, 0, 0, width, height)
         return True
 
+class StyledButton(Clutter.Actor):
+    def __init__(self, widget):
+        Clutter.Actor.__init__(self)
+
+        self.props.reactive = True
+
+        self._widget = widget
+        self._context = widget.get_style_context()
+
+        self._canvas = Clutter.Canvas(width=100, height=100)
+        self._canvas.connect('draw', self._on_canvas_draw)
+        self.props.content = self._canvas
+        self.set_content_scaling_filters(Clutter.ScalingFilter.TRILINEAR, Clutter.ScalingFilter.LINEAR)
+
+        action = Clutter.ClickAction()
+        action.connect('clicked', self._on_clicked)
+        self.add_action(action)
+
+        self._crossing = False
+
+    @GObject.Signal
+    def clicked(self):
+        pass
+
+    def _on_clicked(self, action, actor):
+        self.emit('clicked')
+
+    def do_enter_event(self, event):
+        self._crossing = True
+        self._canvas.invalidate()
+        return False
+
+    def do_leave_event(self, event):
+        self._crossing = False
+        self._canvas.invalidate()
+        return False
+
+    def do_allocate(self, allocation, flags):
+        self.set_allocation(allocation, flags)
+
+        width, height = allocation.get_size()
+        self._canvas.set_size(width, height)
+
+    def _on_canvas_draw(self, canvas, cr, width, height):
+        self._context.save()
+        self._context.add_class('button')
+
+        state = self._context.get_state()
+        if self._crossing:
+            state |= Gtk.StateFlags.PRELIGHT
+
+        self._context.set_state(state)
+
+        Gtk.render_background(self._context, cr, 0, 0, width, height)
+        Gtk.render_frame(self._context, cr, 0, 0, width, height)
+        self._context.restore()
+        return True
+
+def on_button_clicked(actor):
+    print('Clicked!')
+
 if __name__ == '__main__':
     GtkClutter.init(None)
 
@@ -71,9 +133,18 @@ if __name__ == '__main__':
     stage = embed.get_stage()
 
     # A simple rectangle centered on the stage
-    rect = Clutter.Actor(background_color=Clutter.Color.get_static(Clutter.StaticColor.RED))
+    rect = StyledButton(window)
+    rect.set_pivot_point(0.5, 0.5)
     rect.set_size(100, 100)
     rect.add_constraint(Clutter.AlignConstraint(source=stage, align_axis=Clutter.AlignAxis.BOTH, factor=0.5))
+    rect.connect('clicked', on_button_clicked)
     stage.add_child(rect)
 
+    transition = Clutter.PropertyTransition(property_name='rotation-angle-y')
+    transition.set_duration(2000)
+    transition.set_from(0)
+    transition.set_to(360)
+    transition.set_repeat_count(-1)
+    rect.add_transition('spin', transition)
+
     Gtk.main()