当我滚动鼠标滚轮时,会触发几个MouseWheel事件.我正在使用这些事件来扩展一些图像.
我想在一系列MouseWheel事件结束时调用一个方法.我怎么知道他们什么时候结束?
这是我到目前为止的实施
private void ModelWindowBorder_MouseWheel(object sender,MouseWheelEventArgs e) { intervaltimer = null; // Do stuff like zooming and etc CheckEventInterval() } private void CheckEventInterval() { intervaltimer = new Stopwatch(); intervaltimer .Start(); if (intervaltimer.ElapsedMilliseconds > 50) { // Do some other stuff } }
解决方法
@H_301_11@ 实际上,由于摩擦轮旋转是无止境的,因此没有特殊事件来通知使用的结束滚动.但是在您的情况下,您可以测试用户是否在短时间内停止滚动.这可以通过一个简单的计时器来完成://Use dispatcher timer to avoid problems when manipulating UI related objects DispatcherTimer timer; float someValue = 0; public MainWindow() { InitializeComponent(); timer = new DispatcherTimer(); timer.Tick += timer_Tick; timer.Interval = TimeSpan.FromMilliseconds(500 /*Adjust the interval*/); MouseWheel += MainWindow_MouseWheel; } void timer_Tick(object sender,EventArgs e) { //Prevent timer from looping (sender as DispatcherTimer).Stop(); //Perform some action Console.WriteLine("Scrolling stopped (" + someValue + ")"); //Reset for futher scrolling someValue = 0; } void MainWindow_MouseWheel(object sender,MouseWheelEventArgs e) { //Accumulate some value someValue += e.Delta; timer.Stop(); timer.Start(); }
如您所见,MouseWheel事件将启动计时器.如果在计时器触发时发生新的MouseWheel事件,它将重新启动计时器.这样,只有在特定间隔内没有车轮事件时,定时器才会触发.