SL3开始支持Behavior(行为),这个东西可不得了,可以为不同的UI提供各种“花招”。
比如在Expression Blend里本身的MouseDrapElementBehavior,更是一句代码不用写,就可以实现元素拖动效果。
![](https://www.cnblogs.com/Emoticons/baimantou/223332943.gif)
太强大了。
小弟不才,也学着写了一个小示例学习一下,发现制作起来还是非常简单的。先看看效果:
这个示例是为了解决Silverlight本身的ToolTip不能跟随鼠标移动问题的。
实现的代码都不太难,注释也比较清晰了,不在此赘叙了。
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
行为代码
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public class MoveingTipsBehavior:Behavior<UIElement>
2![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
{
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public static readonly DependencyProperty MoveingToolTipProperty = DependencyProperty.Register("MoveingToolTip", typeof(FrameworkElement), typeof(MoveingTipsBehavior), new PropertyMetadata(new TextBlock
{ Text = "MoveingToolTips", }));
4![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
5![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// 行为附加
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/// </summary>
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protected override void OnAttached()
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{
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//注册行为对象鼠标事件
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AssociatedObject.MouseEnter += new MouseEventHandler(AssociatedObject_MouseEnter);
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AssociatedObject.MouseLeave += new MouseEventHandler(AssociatedObject_MouseLeave);
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AssociatedObject.MouseMove += new MouseEventHandler(AssociatedObject_MouseMove);
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base.OnAttached();
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}
16![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
17![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// 需要移动的ToolTip对象
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/// </summary>
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public FrameworkElement MoveingToolTip
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{
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get
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{
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return (FrameworkElement)GetValue(MoveingToolTipProperty);
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}
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set
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{
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SetValue(MoveingToolTipProperty, value);
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}
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}
31![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
32![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// 当鼠标在行为附加对象上移动事执行
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/// </summary>
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void AssociatedObject_MouseMove(object sender, MouseEventArgs e)
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{
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Panel parent = GetFristParentPanel();
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if (parent.Children.Contains(MoveingToolTip))
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{
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Point MousePoint = e.GetPosition(parent);
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//调整ToolTip位置
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MoveingToolTip.Margin = new Thickness(MousePoint.X, MousePoint.Y, 0, 0);
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}
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}
45![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
46![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// 获取最近的一个Panel容器
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/// </summary>
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/// <remarks>当没有找到任何Panel时,抛出异常</remarks>
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private Panel GetFristParentPanel()
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{
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var temp = VisualTreeHelper.GetParent(AssociatedObject);
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if (!(temp is Panel))
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{
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while (true)
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{
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temp = VisualTreeHelper.GetParent(temp);
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if (temp != null && temp is Panel)
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{
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return (Panel)temp;
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}
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if (temp == null)
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{
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throw new MethodAccessException();
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}
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}
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}
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else
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{
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return (Panel)temp;
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}
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}
73![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
74![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// 鼠标在行为对象上离开事件
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/// </summary>
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void AssociatedObject_MouseLeave(object sender, MouseEventArgs e)
78![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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Panel parentPanel = GetFristParentPanel();
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if(parentPanel.Children.Contains(MoveingToolTip))
81![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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//清除ToolTip
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parentPanel.Children.Remove(MoveingToolTip);
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}
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}
86![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
87![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// 鼠标移动到行为对象上执行
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/// </summary>
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void AssociatedObject_MouseEnter(object sender, MouseEventArgs e)
91![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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Panel parentPanel = GetFristParentPanel();
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if (!parentPanel.Children.Contains(MoveingToolTip))
94![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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//把ToolTip添加到最近的容器中
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parentPanel.Children.Add(MoveingToolTip);
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}
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}
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}写以上代码只用了10分钟左右,当然BUG是有不少:
1.MouseMove事件取消了在SL2中的Handled属性,导致如果在多个Panel嵌套的时候,会出现多个ToolTip的情况。
2.鼠标移动到ToolTip上时,依然会接受MouseEnter事件,希望有高手能指导一下,谢谢!
点击这里下载源文件