src/layoutinformation.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
   2 /*
   3  * layoutinformation.cpp
   4  *
   5  * Copyright 2007 Novell, Inc. (http://www.novell.com)
   6  *
   7  * See the LICENSE file included with the distribution for details.
   8  *
   9  */
  10 #include "frameworkelement.h"
  11 #include "geometry.h"
  12 #include "rect.h"
  13 #include "point.h"
  14
  15 Geometry *
  16 LayoutInformation::GetClip (FrameworkElement *item)
  17 {
  18         FrameworkElement *element = item;
  19         Point offset = Point (0,0);
  20         Rect composite (0,0,INFINITY, INFINITY);
  21
  22         while (element) {
  23                 Point *local_offset = GetVisualOffset (element);
  24
  25                 if (!local_offset)
  26                         break;
  27
  28                 Rect relative = *GetLayoutSlot (element);
  29                 offset = offset + *local_offset;
  30                 relative.x -= offset.x;
  31                 relative.y -= offset.y;
  32                 relative = relative.GrowBy (-*element->GetMargin ());
  33
  34                 composite = composite.Intersection (relative);
  35
  36                 if (element != item)
  37                         break;
  38
  39                 element = (FrameworkElement *)element->GetVisualParent ();
  40
  41                 if (element && (element->Is (Type::CANVAS) || element->Is (Type::USERCONTROL)))
  42                         break;
  43         }
  44
  45         if (isinf (composite.width))
  46                 return NULL;
  47
  48         RectangleGeometry *geom = new RectangleGeometry ();
  49         geom->SetRect (&composite);
  50
  51         return geom;
  52 }