(WPF) 如何绑定到用户控件上的 IsMouseOver

发布于 2024-07-24 04:06:46 字数 596 浏览 9 评论 0原文

编辑：问题的原始前提不正确，因此修改了问题：

基本上，我希望只有当鼠标位于包含的用户控件上时按钮才可见。这是我所拥有的简化版本：

<UserControl
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="MyNamespace.MyUserControl"
    x:Name="myUserControl">
    <Textbox>Some Text</Textbox>
    <Button Visibility="{Binding ElementName=myUserControl, Path=IsMouseOver, Converter={StaticResource mouseOverVisibilityConverter}}" />
</UserControl>

如果鼠标位于文本框上方，但不在用户控件中的其他任何位置，则该版本有效。

原文

Edit: The original premise of the question was incorrect so revised the question:

Basically I want a button to be visible only when the mouse is over the containing user control. Here is the simplified versin of what I have:

<UserControl
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="MyNamespace.MyUserControl"
    x:Name="myUserControl">
    <Textbox>Some Text</Textbox>
    <Button Visibility="{Binding ElementName=myUserControl, Path=IsMouseOver, Converter={StaticResource mouseOverVisibilityConverter}}" />
</UserControl>

Which works if the mouse is over the text box, but not anywhere else in the user control.

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晨曦慕雪 2024-07-31 04:06:46

一旦托马斯指出我原来问题中的错误假设，我就修改了问题，这使我发现它在这篇文章。

基本上，用户控件具有空背景（而不是透明），这显然使其对鼠标不可见，即使 IsHitTestVisible 设置为 true 也是如此，因此解决方案是将 Background="Transparent" 添加到用户控件。

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酷遇一生 2024-07-31 04:06:46

我意识到 UserControl 没有 IsMouseOver 属性

，但它有... IsMouseOver 是在 UIElement 类中定义的，UserControl （间接）继承自该类

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贩梦商人 2024-07-31 04:06:46

您可以在派生类中实现该属性。我以前也曾做过这样的事。

Private _IsMouseOver As Boolean = False

Protected Overrides Sub OnMouseEnter(ByVal sender As Object, ByVal e As MouseEventArgs)
     _IsMouseOver = True
     MyBase.OnMouseEnter(sender, e)
End Sub

Protected Overrides Sub OnMouseLeave(ByVal sender As Object, ByVal e As MouseEventArgs)
     _IsMouseOver = False
     MyBase.OnMouseLeave(sender, e)
End Sub

Public ReadOnly Property IsMouseOver As Boolean()
    Get
        Return _IsMouseOver
    End Get
End Property

You could implement that property in a derived class. I've had to do this kind of thing before.

Private _IsMouseOver As Boolean = False

Protected Overrides Sub OnMouseEnter(ByVal sender As Object, ByVal e As MouseEventArgs)
     _IsMouseOver = True
     MyBase.OnMouseEnter(sender, e)
End Sub

Protected Overrides Sub OnMouseLeave(ByVal sender As Object, ByVal e As MouseEventArgs)
     _IsMouseOver = False
     MyBase.OnMouseLeave(sender, e)
End Sub

Public ReadOnly Property IsMouseOver As Boolean()
    Get
        Return _IsMouseOver
    End Get
End Property

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