通過附加行爲的Thumb調整彈出窗口大小

如下圖所示，我有一個彈出窗口，我想用右下角的拇指調整窗口大小。拇指有一個附加的行爲，我想要調整大小。通過附加行爲的Thumb調整彈出窗口大小

<Popup x:Name="Popbox" Placement="Mouse" StaysOpen="False" Width="50" Height="50" > 
    <Grid> 
     <Border Background="AliceBlue"/> 
     <Thumb HorizontalAlignment="Right" 
       VerticalAlignment="Bottom" 
       Width="16" Height="16" > 
      <i:Interaction.Behaviors> 
       <helpers:PopupResizeBehaviors PopupObject="{Binding ElementName=Popbox}"/> 
      </i:Interaction.Behaviors> 
     </Thumb> 
    </Grid> 
</Popup> 


class PopupResizeBehaviors : Behavior<Thumb> 
{ 
    private bool mouseDown; 
    private Point oldMousePosition; 

    protected override void OnAttached() 
    { 
     base.OnAttached(); 

     AssociatedObject.PreviewMouseLeftButtonDown += (s, e) => 
     { 
      mouseDown = true; 
     }; 

     AssociatedObject.DragDelta += (s, e) => 
     { 
      if (!mouseDown) return; 

      double tempWidth = 0; 
      double tempHeight = 0; 
      PopupObject.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity)); 
      tempWidth = PopupObject.DesiredSize.Width; 
      tempHeight = PopupObject.DesiredSize.Height; 

      double yadjust = tempHeight + e.VerticalChange; 
      double xadjust = tempWidth + e.HorizontalChange; 

      PopupObject.Width = xadjust; 
      PopupObject.Height = yadjust; 
     }; 

     AssociatedObject.PreviewMouseLeftButtonUp += (s, e) => 
     { 
      mouseDown = false; 
     }; 
    } 

    protected override void OnDetaching() 
    { 
     base.OnDetaching(); 
    } 

    public static readonly DependencyProperty PopupObjectProperty = 
     DependencyProperty.RegisterAttached("PopupObject", typeof(Popup), typeof(PopupResizeBehaviors), new UIPropertyMetadata(null)); 

    public Popup PopupObject 
    { 
     get { return (Popup)GetValue(PopupObjectProperty); } 
     set { SetValue(PopupObjectProperty, value); } 
    } 
}

它目前沒有工作，但應該給我一個我想要的東西的好主意。

如何讓這種行爲起作用？

來源

2015-01-21 Hank

如果'PopupObject'是一個附加屬性，那麼它不需要定義（在行爲類中）GetPopupObject和SetPopupObject靜態方法嗎？ – 2015-01-21 11:25:23

不，它工作正常。這是問題的實際拖拽和調整大小。 – Hank 2015-01-21 12:09:34

這是我最終使用的。

class PopupResizeBehaviors : Behavior<Thumb> 
{ 
    private const int MaxSize = 500; 
    private const int MinSize = 50; 

    protected override void OnAttached() 
    { 
     base.OnAttached(); 

     AssociatedObject.DragDelta += (s, e) => 
     { 

      Thumb t = s as Thumb; 

      if (t.Cursor == Cursors.SizeWE || t.Cursor == Cursors.SizeNWSE) 
      { 
       PopupObject.Width = Math.Min(MaxSize, 
        Math.Max(PopupObject.Width + e.HorizontalChange, 
        MinSize)); 
      } 

      if (t.Cursor == Cursors.SizeNS || t.Cursor == Cursors.SizeNWSE) 
      { 
       PopupObject.Height = Math.Min(MaxSize, 
        Math.Max(PopupObject.Height + e.VerticalChange, 
        MinSize)); 
      } 
     }; 
    } 

    protected override void OnDetaching() 
    { 
     base.OnDetaching(); 
    } 

    public static readonly DependencyProperty PopupObjectProperty = 
     DependencyProperty.RegisterAttached("PopupObject", typeof(Popup), typeof(PopupResizeBehaviors), new UIPropertyMetadata(null)); 

    public Popup PopupObject 
    { 
     get { return (Popup)GetValue(PopupObjectProperty); } 
     set { SetValue(PopupObjectProperty, value); } 
    } 
}

來源

2015-01-27 09:25:39 Hank

通過附加行爲的Thumb調整彈出窗口大小

回答

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