make GtkView accept adjustments for use in scrolled window.

gaphas/tests/test_view.py

@@ -186,7 +186,28 @@ class ViewTestCase(unittest.TestCase):
         assert not box._matrix_v2i.has_key(view)
         
 
-        
+    def test_scroll_adjustments_signal(self):
+        def handler(self, hadj, vadj):
+            self.handled = True
+
+        sc = gtk.ScrolledWindow()
+        view = GtkView(Canvas())
+        view.connect('set-scroll-adjustments', handler)
+        sc.add(view)
+
+        assert view.handled
+
+
+    def test_scroll_adjustments(self):
+        sc = gtk.ScrolledWindow()
+        view = GtkView(Canvas())
+        sc.add(view)
+
+        print sc.get_hadjustment(), view.hadjustment
+        assert sc.get_hadjustment() is view.hadjustment
+        assert sc.get_vadjustment() is view.vadjustment
+
+
 if __name__ == '__main__':
     unittest.main()
 

gaphas/view.py

@@ -375,6 +375,8 @@ class GtkView(gtk.DrawingArea, View):
     
     # Signals: emited after the change takes effect.
     __gsignals__ = {
+        'set-scroll-adjustments': (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE,
+                      (gtk.Adjustment, gtk.Adjustment)),
         'dropzone-changed': (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE,
                       (gobject.TYPE_PYOBJECT,)),
         'hover-changed': (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE,
@@ -406,10 +408,12 @@ class GtkView(gtk.DrawingArea, View):
                         | gtk.gdk.KEY_RELEASE_MASK
                         | gtk.gdk.SCROLL_MASK)
 
-        self._hadjustment = hadjustment or gtk.Adjustment()
-        self._vadjustment = vadjustment or gtk.Adjustment()
-        self._hadjustment.connect('value-changed', self.on_adjustment_changed)
-        self._vadjustment.connect('value-changed', self.on_adjustment_changed)
+        self._hadjustment = None
+        self._vadjustment = None
+        self._hadjustment_handler_id = None
+        self._vadjustment_handler_id = None
+
+        self.emit('set-scroll-adjustments', hadjustment, vadjustment)
 
         self._tool = DefaultTool()
         
@@ -467,6 +471,27 @@ class GtkView(gtk.DrawingArea, View):
 
     vadjustment = property(lambda s: s._vadjustment)
 
+    
+    def do_set_scroll_adjustments(self, hadjustment, vadjustment):
+        print 'do_set_scroll_adjustments', hadjustment, vadjustment
+        if self._hadjustment_handler_id:
+            self._hadjustment.disconnect(self._hadjustment_handler_id)
+            self._hadjustment_handler_id = None
+        if self._vadjustment_handler_id:
+            self._vadjustment.disconnect(self._vadjustment_handler_id)
+            self._vadjustment_handler_id = None
+
+        self._hadjustment = hadjustment or gtk.Adjustment()
+        self._vadjustment = vadjustment or gtk.Adjustment()
+
+        self._hadjustment_handler_id = \
+                        self._hadjustment.connect('value-changed',
+                                                  self.on_adjustment_changed)
+        self._vadjustment_handler_id = \
+                        self._vadjustment.connect('value-changed',
+                                                  self.on_adjustment_changed)
+        self.update_adjustments()
+
 
     def zoom(self, factor):
         """
@@ -542,7 +567,7 @@ class GtkView(gtk.DrawingArea, View):
         try:
             super(GtkView, self).queue_draw_area(int(x), int(y), int(w+1), int(h+1))
         except OverflowError:
-            # Okay, now the zoom factr is very large or something
+            # Okay, now the zoom factor is very large or something
             a = self.allocation
             super(GtkView, self).queue_draw_area(0, 0, a.width, a.height)
 
@@ -753,4 +778,13 @@ class GtkView(gtk.DrawingArea, View):
         self.queue_draw_refresh()
 
 
+# Set a signal to set adjustments. This way a ScrolledWindow can set its own
+# Adjustment objects on the View. Otherwise a warning is shown:
+#
+# GtkWarning: gtk_scrolled_window_add(): cannot add non scrollable widget use
+# gtk_scrolled_window_add_with_viewport() instead
+
+GtkView.set_set_scroll_adjustments_signal("set-scroll-adjustments")
+
+
 # vim: sw=4:et:ai