wpf - 鼠标单击并拖动事件 WPF

Question

我正在开发一个模拟时钟选择器控件。用户可以单击分针或时针并拖动以转动指针以选择特定时间。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 但我无法让它工作，因为尽管我使用了标志，但当 mousemove 发生时总是触发 MouseMove。有没有更简单的方法？

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;
 }

Answer 1

我认为这是最简单和最直接的方法：

 private void Window_MouseMove(object sender, MouseEventArgs e) {
     if (e.LeftButton == MouseButtonState.Pressed) {
        this.DragMove();
     }
 }

Answer 2

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)
    {
       this.DragMove();
    }
 }

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

成功了

Answer 3

您可以使事情变得更容易，并且不需要处理鼠标向下/向上：

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