From 88b2ded360f6999b0d0132d3859ce79df847f20a Mon Sep 17 00:00:00 2001
From: gaphor@gmail.com <gaphor@gmail.com@a8418922-720d-0410-834f-a69b97ada669>
Date: Wed, 04 Feb 2009 12:16:49 +0000
Subject: Fixed the ZoomTool. Also the way offsets were handled in the Views

on_adjustment_changed method was not right, so when zoomed in there were
scrolling problems.


git-svn-id: http://svn.devjavu.com/gaphor/gaphas/trunk@2694 a8418922-720d-0410-834f-a69b97ada669
---
diff --git a/gaphas/tool.py b/gaphas/tool.py
index 1525937..e2beda6 100644
--- a/gaphas/tool.py
+++ b/gaphas/tool.py
@@ -676,7 +676,6 @@ class PanTool(Tool):
             view._matrix.translate(dx/view._matrix[0], dy/view._matrix[3])
             # Make sure everything's updated
             view.request_update((), view._canvas.get_all_items())
-            view.update_adjustments()
             self.x0 = self.x1
             self.y0 = self.y1
             return True
@@ -697,7 +696,6 @@ class PanTool(Tool):
         elif direction == gdk.SCROLL_DOWN:
             view._matrix.translate(0, -self.speed/view._matrix[3])
         view.request_update((), view._canvas.get_all_items())
-        view.update_adjustments()
         return True
 
 
@@ -716,6 +714,7 @@ class ZoomTool(Tool):
         self.lastdiff = 0;
 
     def on_button_press(self, context, event):
+        print 'ZOOM', event.state
         if event.button == 2 \
                 and event.state & ZOOM_MASK == ZOOM_VALUE:
             print "GRABBING"
@@ -747,14 +746,13 @@ class ZoomTool(Tool):
                 else:
                     factor = 0.9
 
-                view._matrix.translate(-ox, -oy)
-                view._matrix.scale(factor, factor)
-                view._matrix.translate(+ox, +oy)
+                m = view.matrix
+                m.translate(-ox, -oy)
+                m.scale(factor, factor)
+                m.translate(+ox, +oy)
 
                 # Make sure everything's updated
-                map(view.update_matrix, view._canvas.get_all_items())
-                view.request_update(view._canvas.get_all_items())
-                view.update_scrollbars_from_matrix(view.hadjustment,view.vadjustment)
+                view.request_update((), view._canvas.get_all_items())
 
                 self.lastdiff = dy;
             return True
@@ -774,14 +772,11 @@ class ZoomTool(Tool):
             view._matrix.scale(factor, factor)
             view._matrix.translate(+ox, +oy)
             # Make sure everything's updated
-            map(view.update_matrix, view._canvas.get_all_items())
-            view.request_update(view._canvas.get_all_items())
-            view.update_scrollbars_from_matrix(view.hadjustment,view.vadjustment)
+            view.request_update((), view._canvas.get_all_items())
             context.ungrab()
             return True
 
 
-
 class PlacementTool(Tool):
 
     def __init__(self, factory, handle_tool, handle_index):
diff --git a/gaphas/view.py b/gaphas/view.py
index c949922..f704152 100644
--- a/gaphas/view.py
+++ b/gaphas/view.py
@@ -242,11 +242,12 @@ class View(object):
         """
         Zoom in/out by factor @factor.
         """
+        # TODO: should the scale factor be clipped?
         self._matrix.scale(factor, factor)
 
         # Make sure everything's updated
-        map(self.update_matrix, self._canvas.get_all_items())
-        self.request_update(self._canvas.get_all_items())
+        #map(self.update_matrix, self._canvas.get_all_items())
+        self.request_update((), self._canvas.get_all_items())
 
 
     def set_item_bounding_box(self, item, bounds):
@@ -497,10 +498,6 @@ class GtkView(gtk.DrawingArea, View):
         # set upper limits
         hadjustment.upper, vadjustment.upper = u.x1, u.y1
 
-        # set position
-        if v.x != hadjustment.value or v.y != vadjustment.value:
-            hadjustment.value, vadjustment.value = v.x, v.y
-
         # set page size
         aw, ah = self.allocation.width, self.allocation.height
         hadjustment.page_size = aw
@@ -512,6 +509,10 @@ class GtkView(gtk.DrawingArea, View):
         vadjustment.page_increment = ah
         vadjustment.step_increment = ah / 10
 
+        # set position
+        if v.x != hadjustment.value or v.y != vadjustment.value:
+            hadjustment.value, vadjustment.value = v.x, v.y
+
 
     def queue_draw_item(self, *items):
         """
@@ -534,7 +535,12 @@ class GtkView(gtk.DrawingArea, View):
         """
         Wrap draw_area to convert all values to ints.
         """
-        super(GtkView, self).queue_draw_area(int(x), int(y), int(w+1), int(h+1))
+        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
+            a = self.allocation
+            super(GtkView, self).queue_draw_area(0, 0, a.width, a.height)
 
 
     def queue_draw_refresh(self):
@@ -725,10 +731,18 @@ class GtkView(gtk.DrawingArea, View):
         Change the transformation matrix of the view to reflect the
         value of the x/y adjustment (scrollbar).
         """
+        if adj.value == 0.0: return
+
+        # Can not use self._matrix.translate( - adj.value , 0) here, since
+        # the translate method effectively does a m * self._matrix, which
+        # will result in the translation being multiplied by the orig. matrix
+
+        m = Matrix()
         if adj is self._hadjustment:
-            self._matrix.translate( - adj.value , 0)
+            m.translate( - adj.value, 0)
         elif adj is self._vadjustment:
-            self._matrix.translate(0, - adj.value)
+            m.translate(0, - adj.value)
+        self._matrix *= m
 
         # Force recalculation of the bounding boxes:
         self.request_update((), self._canvas.get_all_items())
@@ -736,4 +750,4 @@ class GtkView(gtk.DrawingArea, View):
         self.queue_draw_refresh()
 
 
-# vim: sw=4:et:
+# vim: sw=4:et:ai
--
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