p>你可以让事情变得更容易，而不需要处理鼠标向下/向上：
我正在开发一个模拟时钟选择器控件。用户可以点击分针或时针并拖动以转动指针来选择特定时间。我想知道如何检测这样的点击和拖动事件。
我尝试过使用MouseLeftButtonDown+MouseMove，但我无法使其工作，因为尽管我使用了标志，但当鼠标移动时，MouseMove总是触发的。有什么更简单的方法吗？
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)
{
//my code: moving the needle
}
}
private void minuteHand_MouseLeftButtonUp(object sender, MouseEventArgs e)
{
dragAction = false;
}
我认为这是最简单、最直接的方法：
private void Window_MouseMove(object sender, MouseEventArgs e) {
if (e.LeftButton == MouseButtonState.Pressed) {
this.DragMove();
}
}
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;
}
private void minuteHand_MouseMove(object sender, MouseEventArgs e)
{
if (Mouse.LeftButton == MouseButtonState.Pressed)
{
//my code: moving the needle
}
}