Question

我需要能够在WPF StackPanel上处理双击和单击事件。但是没有StackPanel的DoubleClick事件。我想在这两个EventHandler中做两个不同的操作。

知道怎么做吗？

谢谢

Answer 1

 <StackPanel MouseDown="StackPanel_MouseDown">
   <!--stackpanel content-->
    <TextBlock>Hello</TextBlock>
</StackPanel>

然后在事件处理程序中：

 private void StackPanel_MouseDown(object sender, MouseButtonEventArgs e)
    {
        if (e.ClickCount >= 2)
        { 
            string hello; //only hit here on double click  
        }
    }

应该有效。请注意，在StackPanel中单击会触发事件（但是if if检查失败）

Answer 2

几年后...... @MoominTroll的解决方案完全可以接受。另一种选择是将堆栈面板包装在支持双击事件的内容控件中。

$sid = '239';

Answer 3

最好的方法是使用超时来控制自己的鼠标按钮处理程序 - 如果事件在超时期限内再次触发，则触发双击消息，否则调用单击处理程序。以下是一些示例代码（编辑：最初找到here）：

/// <summary>
/// For double clicks
/// </summary>
public class MouseClickManager {
    private event MouseButtonEventHandler _click;
    private event MouseButtonEventHandler _doubleClick;

    public event MouseButtonEventHandler Click {
        add { _click += value; }
        remove { _click -= value; }
    }

    public event MouseButtonEventHandler DoubleClick {
        add { _doubleClick += value; }
        remove { _doubleClick -= value; }
    }

    /// <summary>
    /// Gets or sets a value indicating whether this <see cref="MouseClickManager"/> is clicked.
    /// </summary>
    /// <value><c>true</c> if clicked; otherwise, <c>false</c>.</value>
    private bool Clicked { get; set; }

    /// <summary>
    /// Gets or sets the timeout.
    /// </summary>
    /// <value>The timeout.</value>
    public int DoubleClickTimeout { get; set; }

    /// <summary>
    /// Initializes a new instance of the <see cref="MouseClickManager"/> class.
    /// </summary>
    /// <param name="control">The control.</param>
    public MouseClickManager(int doubleClickTimeout) {
        this.Clicked = false;
        this.DoubleClickTimeout = doubleClickTimeout;
    }

    /// <summary>
    /// Handles the click.
    /// </summary>
    /// <param name="sender">The sender.</param>
    /// <param name="e">The <see cref="System.Windows.Input.MouseButtonEventArgs"/> instance containing the event data.</param>
    public void HandleClick(object sender, MouseButtonEventArgs e) {
        lock (this) {
            if (this.Clicked) {
                this.Clicked = false;
                OnDoubleClick(sender, e);
            }
            else {
                this.Clicked = true;
                ParameterizedThreadStart threadStart = new ParameterizedThreadStart(ResetThread);
                Thread thread = new Thread(threadStart);
                thread.Start(e);
            }
        }
    }

    /// <summary>
    /// Resets the thread.
    /// </summary>
    /// <param name="state">The state.</param>
    private void ResetThread(object state) {
        Thread.Sleep(this.DoubleClickTimeout);

        lock (this) {
            if (this.Clicked) {
                this.Clicked = false;
                OnClick(this, (MouseButtonEventArgs)state);
            }
        }
    }

    /// <summary>
    /// Called when [click].
    /// </summary>
    /// <param name="sender">The sender.</param>
    /// <param name="e">The <see cref="System.Windows.Input.MouseButtonEventArgs"/> instance containing the event data.</param>
    private void OnClick(object sender, MouseButtonEventArgs e) {
        if (_click != null) {
            if (sender is Control) {
                (sender as Control).Dispatcher.BeginInvoke(_click, sender, e);
            }
        }
    }

    /// <summary>
    /// Called when [double click].
    /// </summary>
    /// <param name="sender">The sender.</param>
    /// <param name="e">The <see cref="System.Windows.Input.MouseButtonEventArgs"/> instance containing the event data.</param>
    private void OnDoubleClick(object sender, MouseButtonEventArgs e) {
        if (_doubleClick != null) {
            _doubleClick(sender, e);
        }
    }
}

然后，在控件中，您希望接收事件：

MouseClickManager fMouseManager = new MouseClickManager(200);
fMouseManager.Click += new MouseButtonEventHandler(YourControl_Click); 
fMouseManager.DoubleClick += new MouseButtonEventHandler(YourControl_DoubleClick);

Answer 4

我遇到了类似的问题（响应单击事件并在双击事件的情况下再做一次工作）。我用这种方式解决了这个问题：

1）定义并声明一些整数来保存最终点击时间戳

int lastClickTimestamp;

2）在Window_Loaded方法中初始化先前声明的变量，其中某个数字大于200

lastClickTimestamp = 1000;

3）将鼠标按钮处理程序添加到堆栈面板

stackPanel.MouseLeftButtonUp += new MouseButtonEventHandler(stackPanel_MouseLeftButtonUp);

4）添加以下方法

void stackPanel_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
    {
        if (e.Timestamp - lastClickTimeStamp < 200)
        {
            //double click
        }
        lastClickTimeStamp = e.Timestamp;

        //single click
    }

如果您需要单独检测单击和双击事件，则此代码无效。这种情况引入了更多的复杂性，但绝对可以解决。

Answer 5

使用WPF DispatcherTimer完成答案。我们按需创建计时器并在完成后断开连接以防止资源堵塞。

C＃：

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Input;
using System.Windows.Threading;

public partial class MainWindow : Window
{
    DispatcherTimer dt;

    bool clear_timer()
    {
        if (dt == null)
            return false;
        dt.Tick -= _single_click;
        dt = null;
        return true;
    }

    private void _click(Object sender, MouseButtonEventArgs e)
    {
        if (clear_timer())
            Debug.Print("double click");
        else
            dt = new DispatcherTimer(
                        TimeSpan.FromMilliseconds(GetDoubleClickTime()),
                        DispatcherPriority.Normal,
                        _single_click,
                        Dispatcher);
    }

    void _single_click(Object sender, EventArgs e)
    {
        clear_timer();
        Debug.Print("single click");
    }

    public MainWindow() { InitializeComponent(); }

    [DllImport("user32.dll")]
    static extern uint GetDoubleClickTime();
 };

XAML：

<Window x:Class="MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <StackPanel Orientation="Horizontal"
                Background="AliceBlue"
                Width="100"
                Height="100"
                MouseLeftButtonDown="_click" />
</Window>

Answer 6

有一个更简单的解决方案可以做到这一点。

在StackPanel的事件PreviewMouseLeftDown（例如）中，您可以检查MouseButtonEventArgs.ClickCount属性的值是否为2。 1 =单击 2 =双击

带有Click AND DoubleClick的WPF StackPanel

6 个答案: