Fix media preview for preview size changes

Bug #8429.

gramps/gui/editors/editmediaref.py

@@ -100,6 +100,7 @@ class EditMediaRef(EditReference):
         tblref =  self.top.get_object('table50')
         self.notebook_ref = self.top.get_object('notebook_ref')
         self.track_ref_for_deletion("notebook_ref")
+        self.expander = self.top.get_object('expander1')
         #recreate start page as GrampsTab
         self.notebook_ref.remove_page(0)
         self.reftab = RefTab(self.dbstate, self.uistate, self.track,
@@ -187,6 +188,7 @@ class EditMediaRef(EditReference):
         self.selection.set_multiple_selection(False)
         self.selection.connect("region-modified", self.region_modified)
         self.selection.connect("region-created", self.region_modified)
+        self.expander.connect("activate", self.selection.expander)
         frame = self.top.get_object("frame9")
         frame.add(self.selection)
         self.track_ref_for_deletion("selection")

gramps/gui/widgets/selectionwidget.py

@@ -197,6 +197,7 @@ class SelectionWidget(Gtk.ScrolledWindow):
         self.pixbuf = None
         self.scaled_pixbuf = None
         self.scale = 1.0
+        self.old_viewport_size = None
 
         Gtk.ScrolledWindow.__init__(self)
         self.add(self._build_gui())
@@ -227,6 +228,7 @@ class SelectionWidget(Gtk.ScrolledWindow):
         self.event_box.add(self.image)
 
         self.viewport = Gtk.Viewport()
+        self.connect("size-allocate", self._resize)
         self.viewport.add(self.event_box)
         return self.viewport
 
@@ -296,6 +298,7 @@ class SelectionWidget(Gtk.ScrolledWindow):
                                         self.pixbuf.get_height())
 
             viewport_size = self.viewport.get_allocation()
+            self.old_viewport_size = viewport_size
             self.scale = scale_to_fit(self.pixbuf.get_width(),
                                       self.pixbuf.get_height(),
                                       viewport_size.width,
@@ -313,6 +316,32 @@ class SelectionWidget(Gtk.ScrolledWindow):
         self.image.set_from_icon_name('image-missing', Gtk.IconSize.DIALOG)
         self.image.queue_draw()
 
+    def _resize(self, *dummy):
+        """
+        Handles size-allocate' events from Gtk.
+        """
+        if self.pixbuf:
+            viewport_size = self.viewport.get_allocation()
+            if viewport_size.height != self.old_viewport_size.height or \
+                    viewport_size.width != self.old_viewport_size.width or \
+                    not self.image.get_pixbuf():
+                self.scale = scale_to_fit(self.pixbuf.get_width(),
+                                          self.pixbuf.get_height(),
+                                          viewport_size.width,
+                                          viewport_size.height)
+                self._rescale()
+                self.old_viewport_size = viewport_size
+                return False
+
+    def expander(self, *dummy):
+        """ Handler for expander in caller; needed because Gtk doesn't handle
+        verticle expansion right
+        """
+        self.image.clear()
+        self.image.set_size_request(2, 2)
+        self.event_box.set_size_request(2, 2)
+        return False
+
     # ======================================================
     # coordinate transformations (public methods)
     # ======================================================
@@ -531,14 +560,14 @@ class SelectionWidget(Gtk.ScrolledWindow):
     # drawing and scaling the image
     # ======================================================
 
-    def _expose_handler(self, widget, event):
+    def _expose_handler(self, widget, cr):
         """
         Handles the expose-event signal of the underlying widget.
         """
         if self.pixbuf:
-            self._draw_selection()
+            self._draw_selection(widget, cr)
 
-    def _draw_selection(self):
+    def _draw_selection(self, widget, cr):
         """
         Draws the image, the selection boxes and does the necessary
         shading.
@@ -551,8 +580,6 @@ class SelectionWidget(Gtk.ScrolledWindow):
         offset_x -= 1
         offset_y -= 1
 
-        cr = self.image.get_window().cairo_create()
-
         if self.selection:
             x1, y1, x2, y2 = self._rect_image_to_screen(self.selection)