Add a new example of subclassing a GtkWidget.

	* examples/gtk/widget.py: Add a new example of subclassing a GtkWidget.

	* Makefile.am (EXTRA_DIST): Add widget.py

	* pygobject.c (pygobject_new): guard object_ref call

1 files changed, 84 insertions, 0 deletions

diff --git a/examples/gtk/widget.py b/examples/gtk/widget.py
new file mode 100644
index 00000000..d685d52e
--- /dev/null
+++ b/examples/gtk/widget.py
@@ -0,0 +1,84 @@
+import ltihooks
+import gobject
+print gobject
+import pango
+import gtk
+from gtk import gdk
+
+TEXT = 'A GtkWidget implemented in PyGTK'
+
+class Widget(gtk.Widget):
+    __gsignals__ = { 'realize': 'override',
+                     'expose-event' : 'override',
+                     'size-allocate': 'override'}   
+    def __init__(self):
+        self.__gobject_init__()
+
+        self.draw_gc = None
+        self.layout = self.create_pango_layout(TEXT)
+        self.layout.set_font_description(pango.FontDescription("sans serif 16"))
+                                         
+    def do_realize(self):
+        self.set_flags(self.flags() | gtk.REALIZED)
+
+        self.window = gdk.Window(self.get_parent_window(),
+                                 width=self.allocation.width,
+                                 height=self.allocation.height,
+                                 window_type=gtk.gdk.WINDOW_CHILD,
+                                 wclass=gtk.gdk.INPUT_OUTPUT,
+                                 event_mask=self.get_events() | gdk.EXPOSURE_MASK)
+        self.draw_gc = gdk.GC(self.window,
+                              line_width=5,
+                              line_style=gdk.SOLID,
+                              join_style=gdk.JOIN_ROUND)
+	self.window.set_user_data(self)
+        self.style.attach(self.window)
+        self.style.set_background(self.window, gtk.STATE_NORMAL)
+        
+        self.send_configure()
+
+    def do_size_allocate(self, allocation):
+        self.allocation = allocation
+
+        if self.flags() & gtk.REALIZED:
+            self.window.move_resize(*allocation)
+            self.send_configure()
+
+    def do_expose_event(self, event):
+        self.chain(event)
+
+        x, y, w, h = self.allocation
+        width = 10
+        self.window.draw_rectangle(self.draw_gc, False,
+                                   x + width, y + width,
+                                   w - width * 2, h - width * 2)
+        fontw, fonth = self.layout.get_pixel_size()
+        self.style.paint_layout(self.window, self.state, False,
+                                event.area, self, "label",
+                                (w - fontw) / 2, (h - fonth) / 2,
+                                self.layout)
+            
+    def send_configure(self):
+        allocation = self.allocation
+        
+        event = gdk.Event(gdk.CONFIGURE)
+        event.send_event = True
+        event.window = self.window
+        event.x = allocation.x
+        event.y = allocation.y
+        event.width = allocation.width
+        event.height = allocation.height
+        self.event(event)
+
+gobject.type_register(Widget)
+
+win = gtk.Window()
+win.set_title(TEXT)
+win.connect('delete-event', gtk.main_quit)
+w = Widget()
+w.set_size_request(400, 200)
+win.add(w)
+
+win.show_all()
+
+gtk.main()