[英]wpf context menu left-click
Is it possible to attach context menu to a wpf control and have it opened on left-click (as opposed to more customary right-click)? 是否可以将上下文菜单附加到wpf控件,并在单击鼠标左键(而不是通常的右键单击)时将其打开? I want to achieve that using xaml only (this should be a part of my control's view template). 我想仅使用xaml来实现这一点(这应该是控件的视图模板的一部分)。
Here is a way to show context menu on left-click: 这是一种在单击鼠标左键时显示上下文菜单的方法:
Create a new left button handler on the Border
element: 在Border
元素上创建一个新的左按钮处理程序:
<Border x:Name="Win"
Width="40"
Height="40"
Background="Purple"
MouseLeftButtonUp="UIElement_OnMouseLeftButtonUp">
and then add this: 然后添加以下内容:
private void UIElement_OnMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
e.Handled = true;
var mouseDownEvent =
new MouseButtonEventArgs(Mouse.PrimaryDevice,
Environment.TickCount,
MouseButton.Right)
{
RoutedEvent = Mouse.MouseUpEvent,
Source = Win,
};
InputManager.Current.ProcessInput(mouseDownEvent);
}
What it does, it basically maps the left-click into right-click. 它所做的基本上是将左键单击映射为右键单击。 For reusability, you can wrap this into an attached behavior. 为了实现可重用性,可以将其包装为附加行为。
Here is how I would do a simple example of what I am suggesting: 这是我要提出的建议的简单示例:
The XAML: XAML:
<Window x:Class="LeftClickMenu.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow">
<Grid>
<Border Width="400" Height="300" Background="#ccc" BorderBrush="#333"
BorderThickness="1"
MouseLeftButtonDown="Border_MouseLeftButtonDown"
MouseRightButtonUp="Border_MouseRightButtonUp">
<Border.ContextMenu>
<ContextMenu x:Name="myContextMenu">
<MenuItem Header="Menu Item 1" />
<MenuItem Header="Menu Item 2" />
<MenuItem Header="Menu Item 3" />
<MenuItem Header="Menu Item 4" />
<MenuItem Header="Menu Item 5" />
</ContextMenu>
</Border.ContextMenu>
</Border>
</Grid>
</Window>
And the code-behind: 和背后的代码:
using System.Windows;
using System.Windows.Input;
namespace LeftClickMenu
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void Border_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
myContextMenu.IsOpen = true;
}
private void Border_MouseRightButtonUp(object sender, MouseButtonEventArgs e)
{
e.Handled = true;
}
}
}
I also added the extra MouseRightButtonUp event to inhibit the right-click popup of the context menu. 我还添加了额外的MouseRightButtonUp事件,以禁止右键单击上下文菜单的弹出窗口。
Create a method to programmatically open a submenu as stated in this SO article: Show menu programmatically in WPF 创建一种方法以编程方式打开此SO文章中所述的子菜单: 在WPF中以编程方式显示菜单
Create an event for LeftMouseButtonDown and call that event in XAML. 为LeftMouseButtonDown创建一个事件,然后在XAML中调用该事件。
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