鼠标单击并拖动事件 WPF
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Mouse click and drag Event WPF
提问by Ji yong
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.
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。
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?
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，但在发生 mousemove 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;
}
回答by George TG
I think this is the easiest and most straightforward way :
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();
}
}
回答by deafjeff
You can make things easier and need not handle mouse down / up :
你可以让事情变得更简单，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
}
}
回答by Nick Prozee
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;
}
does the trick
有诀窍
