按下按钮上的C＃Winform循环事件

I made two buttons which controls scrolling on a DataGrid OnClick. I'll like to execute the code managing the scroll when users stay press on it.

我制作了两个按钮来控制DataGrid OnClick上的滚动。我想在用户按下它时执行管理滚动的代码。

I tried on MouseDown() but the code is execute only one time.

我试过MouseDown(),但代码只执行一次。

Need help.

3 个解决方案

#1

When you get a mouse down event, set a timer to start calling a "scroll" callback function every 200ms or so (random guess on the time).

当你得到一个鼠标按下事件时,设置一个计时器开始每200ms左右开始调用一次“滚动”回调函数(随机猜测时间)。

In the timer callback, scroll by one "notch" (however much you make it.)

在计时器回调中,滚动一个“缺口”(无论你做多少)。

When you get a mouse up event, stop the timer.

当您获得鼠标按下事件时,请停止计时器。

#2

If you don't want to use the timer, you can always spawn a thread when needed. You only have to be careful to use Invoke() mechanism when using the UI controls, which are on the other thread.

如果您不想使用计时器,则可以在需要时始终生成线程。在使用另一个线程上的UI控件时,您只需要小心使用Invoke()机制。

Code:

private bool mouseDown = false;

private void buttonScrollUp_MouseDown(object sender, MouseEventArgs e)
{
  mouseDown = true;
  new Thread(() => { 
    while (mouseDown)
    {
      Invoke(new MethodInvoker(() => [DO_THE_SCROLLING_HERE));
      Thread.Sleep([SET_AUTOREPEAT_TIMEOUT_HERE);
    }
  })
  .Start();
}

private void buttonScrollUp_MouseUp(object sender, MouseEventArgs e)
{
  mouseDown = false;
}

Code snippet above of course lacks some sanity and error cheks.

上面的代码片段当然缺乏一些理智和错误。

LP, Dejan

#3

Main idea is to implement timer, for example every 100ms, and do your logic in tick event. Algorithm can look like:

主要思想是实现计时器,例如每100毫秒,并在tick事件中执行你的逻辑。算法可能如下所示:

Capture mouse and start timer in MouseDown event

在MouseDown事件中捕获鼠标并启动计时器

In MouseMove detect is cursor still over button, if no set flag

在MouseMove中,如果没有设置标志,则检测光标仍然在按钮上

In timer tick check flag is mouse over button, and do your scroll logic

在计时器中,勾选检查标志是鼠标悬停按钮,并执行滚动逻辑

Release mouse capture and stop timer in MouseUp event

在MouseUp事件中释放鼠标捕获和停止计时器

#1

When you get a mouse down event, set a timer to start calling a "scroll" callback function every 200ms or so (random guess on the time).