src/canvas.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
   2 /*
   3  * canvas.cpp: canvas definitions.
   4  *
   5  * Contact:
   6  *   Moonlight List (moonlight-list@lists.ximian.com)
   7  *
   8  * Copyright 2007 Novell, Inc. (http://www.novell.com)
   9  *
  10  * See the LICENSE file included with the distribution for details.
  11  *
  12  */
  13
  14 #include <config.h>
  15
  16 #include <math.h>
  17
  18 #include "rect.h"
  19 #include "canvas.h"
  20 #include "runtime.h"
  21 #include "namescope.h"
  22 #include "collection.h"
  23 #include "deployment.h"
  24
  25 Canvas::Canvas ()
  26 {
  27         SetObjectType (Type::CANVAS);
  28 }
  29
  30 void
  31 Canvas::ComputeBounds ()
  32 {
  33         Surface *surface = GetSurface ();
  34         Panel::ComputeBounds ();
  35         if (surface && surface->IsTopLevel (this)) {
  36                 // toplevel canvas don't subscribe to the same bounds computation as others
  37                 bounds = Rect (0, 0, surface->GetWindow()->GetWidth(), surface->GetWindow()->GetHeight());
  38                 bounds_with_children = Rect (0, 0, surface->GetWindow()->GetWidth(), surface->GetWindow()->GetHeight());
  39         }
  40 }
  41
  42 void
  43 Canvas::ShiftPosition (Point p)
  44 {
  45         Surface *surface = GetSurface ();
  46         if (surface && surface->IsTopLevel (this)) {
  47                 ComputeBounds ();
  48         } else {
  49                 Panel::ShiftPosition (p);
  50         }
  51 }
  52
  53 void
  54 Canvas::OnPropertyChanged (PropertyChangedEventArgs *args, MoonError *error)
  55 {
  56         if (args->GetProperty ()->GetOwnerType() != Type::CANVAS) {
  57                 Panel::OnPropertyChanged (args, error);
  58                 return;
  59         }
  60
  61         if (args->GetId () == Canvas::TopProperty
  62             || args->GetId () == Canvas::LeftProperty) {
  63                 if (GetVisualParent () == NULL) {
  64                         UpdateTransform ();
  65                         InvalidateArrange ();
  66                 }
  67         }
  68         NotifyListenersOfPropertyChange (args, error);
  69 }
  70
  71 bool
  72 Canvas::IsLayoutContainer ()
  73 {
  74         Types *types = Deployment::GetCurrent ()->GetTypes ();
  75
  76         DeepTreeWalker walker = DeepTreeWalker (this);
  77         while (UIElement *child = walker.Step ()) {
  78                 if (!types->IsSubclassOf (child->GetObjectType (), Type::CANVAS) && child->IsLayoutContainer ())
  79                         return true;
  80         }
  81
  82         return false;
  83 }
  84
  85 Size
  86 Canvas::MeasureOverride (Size availableSize)
  87 {
  88         Size childSize = Size (INFINITY, INFINITY);
  89
  90         VisualTreeWalker walker = VisualTreeWalker (this);
  91         while (UIElement *child = walker.Step ()) {
  92                 child->Measure (childSize);
  93         }
  94
  95         Size desired = Size (0,0);
  96
  97         return desired;
  98 }
  99
 100 Size
 101 Canvas::ArrangeOverride (Size finalSize)
 102 {
 103         VisualTreeWalker walker = VisualTreeWalker (this);
 104         while (FrameworkElement *child = (FrameworkElement *)walker.Step ()) {
 105                 Size desired = child->GetDesiredSize ();
 106                 Rect child_final = Rect (GetLeft (child), GetTop (child),
 107                                          desired.width, desired.height);
 108                 child->Arrange (child_final);
 109                 //child->ClearValue (LayoutInformation::LayoutClipProperty);
 110         }
 111
 112         return finalSize;
 113 }
 114
 115 void
 116 Canvas::OnCollectionItemChanged (Collection *col, DependencyObject *obj, PropertyChangedEventArgs *args)
 117 {
 118         if (col == GetChildren()) {
 119                 // this used to contain ZIndex property checking, but
 120                 // it has been moved to Panel's implementation, since
 121                 // all panels allow ZIndex sorting of children.
 122                 if (args->GetId () == Canvas::TopProperty ||
 123                     args->GetId () == Canvas::LeftProperty) {
 124                         UIElement *ui = (UIElement *) obj;
 125
 126                         ui->InvalidateSubtreePaint ();
 127                         InvalidateArrange ();
 128                         UpdateBounds ();
 129                         return;
 130                 }
 131         }
 132
 133         Panel::OnCollectionItemChanged (col, obj, args);
 134 }