From e080cd8d3a45ceafe23067307373127b0a24081c Mon Sep 17 00:00:00 2001
From: Manuel Quiñones <manuq@laptop.org>
Date: Wed, 15 May 2013 03:48:53 +0000
Subject: Make zoom buttons sensitivity work

---
diff --git a/ImageView.py b/ImageView.py
index 23105f4..e74f3e9 100644
--- a/ImageView.py
+++ b/ImageView.py
@@ -54,20 +54,28 @@ class ImageViewer(Gtk.DrawingArea):
         self.queue_draw()
 
     def set_zoom(self, zoom):
+        if zoom < ZOOM_MIN or zoom > ZOOM_MAX:
+            return
         self._zoom = zoom
         self.queue_draw()
 
     def get_zoom(self):
         return self._zoom
 
+    def can_zoom_in(self):
+        return self._zoom + ZOOM_STEP < ZOOM_MAX
+
+    def can_zoom_out(self):
+        return self._zoom - ZOOM_STEP > ZOOM_MIN
+
     def zoom_in(self):
-        if self._zoom + ZOOM_STEP > ZOOM_MAX:
+        if not self.can_zoom_in():
             return
         self._zoom += ZOOM_STEP
         self.queue_draw()
 
     def zoom_out(self):
-        if self._zoom - ZOOM_STEP < ZOOM_MIN:
+        if not self.can_zoom_out():
             return
         self._zoom -= ZOOM_MIN
         self.queue_draw()
@@ -90,7 +98,7 @@ class ImageViewer(Gtk.DrawingArea):
             self._zoom = 1.0
         self.queue_draw()
 
-    def zoom_equal(self):
+    def zoom_original(self):
         self._zoom = 1
         self.queue_draw()
 
diff --git a/ImageViewerActivity.py b/ImageViewerActivity.py
index 1a92015..7d73d42 100644
--- a/ImageViewerActivity.py
+++ b/ImageViewerActivity.py
@@ -273,19 +273,25 @@ class ImageViewerActivity(activity.Activity):
         toolbar_box.toolbar.insert(stop_button, -1)
         stop_button.show()
 
+    def _update_zoom_buttons(self):
+        self._zoom_in_button.set_sensitive(self.view.can_zoom_in())
+        self._zoom_out_button.set_sensitive(self.view.can_zoom_out())
+
     def __zoom_in_cb(self, button):
-        self._zoom_in_button.set_sensitive(self.view.zoom_in())
-        self._zoom_out_button.set_sensitive(True)
+        self.view.zoom_in()
+        self._update_zoom_buttons()
 
     def __zoom_out_cb(self, button):
-        self._zoom_out_button.set_sensitive(self.view.zoom_out())
-        self._zoom_in_button.set_sensitive(True)
+        self.view.zoom_out()
+        self._update_zoom_buttons()
 
     def __zoom_tofit_cb(self, button):
         self.view.zoom_to_fit()
+        self._update_zoom_buttons()
 
     def __zoom_original_cb(self, button):
-        self.view.zoom_equal()
+        self.view.zoom_original()
+        self._update_zoom_buttons()
 
     def __rotate_anticlockwise_cb(self, button):
         angle = self.view.angle - math.pi / 2
--
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