鼠标单击并拖动事件WPF [英] Mouse click and drag Event WPF

问题描述

我正在开发一个模拟时钟选择器控制。
用户能够点击分针或小时针并拖动以选择指定的时间。我想知道如何检测这样的点击和拖动事件。

我尝试使用MouseLeftButtonDown + MouseMove，但是我无法让它工作，因为MouseMove始终触发，当mousemove发生，尽管我使用一个标志。有什么更容易的方法吗？

  public bool dragAction = false; 
 
 private void minuteHand_MouseLeftButtonDown（object sender，MouseButtonEventArgs e）
 {
 dragAction = true; 
 minuteHand_MouseMove（this.minuteHand，e）; 
} 
 
 private void minuteHand_MouseMove（object sender，MouseEventArgs e）
 {
 if（dragAction == true）
 {
 //我的代码：移动针
} 
} 
 
 private void minuteHand_MouseLeftButtonUp（object sender，MouseEventArgs e）
 {
 dragAction = false; 
} 
  

解决方案

不需要处理鼠标向下/向上：

  private void minuteHand_MouseMove（object sender，MouseEventArgs e）
 {
 if（Mouse.LeftButton == MouseButtonState.Pressed）
 {
 //我的代码：移动针
} 
} 
  

I am developing an analog clock picker control. The user is able to click on the minute or hour hand and drag to turn the needle to select the specific time. I was wondering how to detect such a click and drag event.

I tried using MouseLeftButtonDown + MouseMove but I cannot get it to work as MouseMove is always trigger when the mousemove happen despite me using a flag. Is there any easier way?

public bool dragAction = false;

private void minuteHand_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    dragAction = true;
    minuteHand_MouseMove(this.minuteHand, e);
}

private void minuteHand_MouseMove(object sender, MouseEventArgs e)
{
    if (dragAction == true)
    {
       //my code: moving the needle
    }
 }

 private void minuteHand_MouseLeftButtonUp(object sender, MouseEventArgs e)
 {
    dragAction = false;
 }

解决方案

You can make things easier and need not handle mouse down / up :

private void minuteHand_MouseMove(object sender, MouseEventArgs e)
{
    if (Mouse.LeftButton == MouseButtonState.Pressed)
    {
        //my code: moving the needle
    }
 }    

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