mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/View/ExtensionWindowResizeGrip.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4 namespace System.Activities.Presentation.View
   5 {
   6     using System.ComponentModel;
   7     using System.Diagnostics.CodeAnalysis;
   8     using System.Runtime;
   9     using System.Windows;
  10     using System.Windows.Controls;
  11     using System.Windows.Input;
  12     using System.Windows.Media;
  13
  14     //This class is visual representation of ResizeGrip like control, which is used with ExtenstionWindows to allow
  15     //resizing. Actual resize logic is handled by ExtensionSurface class
  16     [TemplatePart(Name = "PART_ResizeGrip")]
  17     class ExtensionWindowResizeGrip : Control
  18     {
  19         public static readonly DependencyProperty IconProperty =
  20             DependencyProperty.Register("Icon", typeof(DrawingBrush), typeof(ExtensionWindowResizeGrip));
  21
  22         ExtensionWindow parent;
  23         ExtensionSurface surface;
  24         Point offset;
  25
  26         [SuppressMessage(FxCop.Category.Performance, FxCop.Rule.InitializeReferenceTypeStaticFieldsInline,
  27             Justification = "Overriding metadata for dependency properties in static constructor is the way suggested by WPF")]
  28         static ExtensionWindowResizeGrip()
  29         {
  30             DefaultStyleKeyProperty.OverrideMetadata(
  31                 typeof(ExtensionWindowResizeGrip),
  32                 new FrameworkPropertyMetadata(typeof(ExtensionWindowResizeGrip)));
  33         }
  34
  35         public DrawingBrush Icon
  36         {
  37             get { return (DrawingBrush)GetValue(IconProperty); }
  38             set { SetValue(IconProperty, value); }
  39         }
  40
  41         protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
  42         {
  43             base.OnMouseLeftButtonDown(e);
  44             if (this.parent.IsResizable)
  45             {
  46                 this.Cursor = Cursors.SizeNWSE;
  47                 this.offset = e.GetPosition(this);
  48                 CaptureMouse();
  49             }
  50         }
  51
  52         protected override void OnMouseMove(MouseEventArgs args)
  53         {
  54             base.OnMouseMove(args);
  55             if (args.LeftButton == MouseButtonState.Pressed && this.IsMouseCaptured)
  56             {
  57                 Point currentPosition = Mouse.GetPosition(this.parent);
  58                 currentPosition.Offset(this.offset.X, this.offset.Y);
  59                 Size newSize = new Size();
  60                 newSize.Width = Math.Min(Math.Max(this.parent.MinWidth, currentPosition.X), this.parent.MaxWidth);
  61                 newSize.Height = Math.Min(Math.Max(this.parent.MinHeight, currentPosition.Y), this.parent.MaxHeight);
  62                 System.Diagnostics.Debug.WriteLine("NewSize = (" + newSize.Width + "," + newSize.Height + ")");
  63                 this.surface.SetSize(this.parent, newSize);
  64             }
  65         }
  66
  67         protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
  68         {
  69             base.OnMouseLeftButtonUp(e);
  70             Mouse.OverrideCursor = null;
  71             Mouse.Capture(null);
  72         }
  73
  74         protected override void OnVisualParentChanged(DependencyObject oldParent)
  75         {
  76             base.OnVisualParentChanged(oldParent);
  77             if (!DesignerProperties.GetIsInDesignMode(this) &&
  78                 !ExtensionWindow.TryGetParentExtensionWindow(this, out this.parent, out this.surface))
  79             {
  80                 Fx.Assert("ExtensionWindowHeader cannot be used outside ExtensionWindow");
  81             }
  82         }
  83
  84     }
  85 }