WPF在这种情况下,用击和双击
-
10-07-2019 - |
题
我需要能够处理 双击 和 单 事WPF在这种情况下.但是没有这样的事情作为在这种情况下的双击事件。我想要做的2种不同的行动在这些再触发其它处理2.
任何想法,如何做到这一点?
谢谢你
解决方案
最好的方法是正确的你自己的老鼠按钮处理程序与超时-如果事件是解雇了再次超时期间内,那么解雇你的双击的消息,否则该单处理程序。这里是一些样品代码(编辑: 最初发现 在这里,):
/// <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,在控制你想要接受的事件:
MouseClickManager fMouseManager = new MouseClickManager(200);
fMouseManager.Click += new MouseButtonEventHandler(YourControl_Click);
fMouseManager.DoubleClick += new MouseButtonEventHandler(YourControl_DoubleClick);
其他提示
<StackPanel MouseDown="StackPanel_MouseDown">
<!--stackpanel content-->
<TextBlock>Hello</TextBlock>
</StackPanel>
然后,在事件处理程序:
private void StackPanel_MouseDown(object sender, MouseButtonEventArgs e)
{
if (e.ClickCount >= 2)
{
string hello; //only hit here on double click
}
}
应该工作。请注意,在StackPanel中该单一点击会打事件(但失败了,如果检查)
...年以后。 @姆明的解决方案是完全可以接受的。另一种选择是包裹堆叠面板在支持双击事件内容的控制。
<ContentControl MouseDoubleClick="DoubleClickHandler" >
<StackPanel>
</StackPanel>
</ContentControl>
另一种选择是一个MouseBinding添加对StackElement化InputBindings然后添加得到由MouseBinding激活的CommandBinding。综合来看,这比基于事件的机制,更好的做法,因为它避免了强引用的内存泄漏问题。它还提供了用于从表示命令逻辑的分离。
这就是说,它不是直线前进和附接到所述事件为一个伟大的快捷方式。
和不言而喻,让您的StackPanel的背景至少透明,否则将无法通过鼠标点击被抓打,当你点击“背景”的考验。空的背景是由碰撞检测跳过。
我有一个类似的问题(响应单一的点击事件和双击事件的情况下做的额外工作)。我解决了这个问题是这样的:
1)定义和声明一些整数来保存最后一次点击的时间戳
int lastClickTimestamp;
与一些数量的2)在Window_Loaded方法先前初始化声明的变量大于200
lastClickTimestamp = 1000;
3)鼠标按钮的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单击和双击事件这段代码是没用的。这种情况介绍多一点复杂,但definitly可以解决的。
使用WPF DispatcherTimer
完整的答案。我们根据需要创建定时器,以防止资源堵塞完成后断开连接。
在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();
};
在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>
有一个更简单的解决方案来做到这一点。
在StackPanel中的事件PreviewMouseLeftDown(例如),则可以检查是否MouseButtonEventArgs.ClickCount属性具有为2的值。 1 =单点击 2 =双击