仅使用XAML在按钮上使用IsMouseOver时显示ContextMenu [英] Bring up ContextMenu when IsMouseOver on a Button using only XAML

问题描述

我正在尝试使用XAML（仅，没有代码隐藏）来调出按钮的ContextMenu。

I am trying to use XAML (only, no codebehind) to bring up the ContextMenu of a button.

我的按钮在这里

<Button x:Name="btn" Style="{StaticResource mybutton}" >
<Button.ContextMenu>
    <ContextMenu>
        <TextBlock Text="Information"/>
    </ContextMenu>
</Button.ContextMenu>
</Button>

此处按钮的样式

<Style TargetType="{x:Type Button}" x:Key="mybutton">
<Setter Property="Template">
    <Setter.Value>
        <ControlTemplate TargetType="{x:Type Button}">
            <ControlTemplate.Triggers>
                <Trigger Property="IsMouseOver" Value="True">
                    <Setter Property="ContextMenu.IsOpen" Value="True"/>
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
    </Setter.Value>
</Setter>
</Style>

我的google-fu让我失望，因为它似乎是一个简单的解决方案。我真的很想避免使用代码隐藏（MouseEnter / MouseLeave事件）。

My google-fu is failing me for what seems like an easy solution. I really would prefer to avoid using codebehind (MouseEnter/MouseLeave events).

预先感谢您。

推荐答案

通过在 TargetName属性中提供它的名称，尝试为ControlTemplate中的ContextMenu应用 Setter。例如：

Try to apply "Setter" for a ContextMenu within the ControlTemplate, by providing it's name in the "TargetName" property. For example:

<Button Width="100" Height="100" x:Name="btn">
        <Button.Style>
            <Style TargetType="Button">
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="{x:Type Button}">
                            <Border CornerRadius="2" BorderThickness="3" BorderBrush="DarkGray" x:Name="border">
                                <Border.ContextMenu>
                                    <ContextMenu x:Name="cmenu">
                                        <TextBlock>Information</TextBlock>
                                    </ContextMenu>
                                </Border.ContextMenu>
                            </Border>
                            <ControlTemplate.Triggers>
                                <Trigger Property="IsMouseOver" Value="True">
                                    <Setter Property="ContextMenu.IsOpen" Value="True" TargetName="cmenu"/>
                                </Trigger>
                            </ControlTemplate.Triggers>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
        </Button.Style>

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