[英]Get and Select the ListBoxItem clicked from ListBox_PreviewMouseLeftButtonUp event
I have a ListBox that slides its ScrollViewer horizontally by dragging with the left mouse button pressed.我有一个 ListBox,它通过按住鼠标左键拖动来水平滑动其 ScrollViewer。
private ScrollViewer scrollViewer;
private Point scrollMousePoint = new Point();
private double horizontalOffset = 1;
private void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
Border border = (Border)VisualTreeHelper.GetChild(myListBox, 0);
scrollViewer = (ScrollViewer)VisualTreeHelper.GetChild(border, 0);
// This works
}
private void myListBox_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
scrollMousePoint = e.GetPosition(scrollViewer);
horizontalOffset = scrollViewer.HorizontalOffset;
scrollViewer.CaptureMouse();
// This works
}
private void myListBox_PreviewMouseMove(object sender, MouseEventArgs e)
{
if (scrollViewer.IsMouseCaptured)
scrollViewer.ScrollToHorizontalOffset(horizontalOffset + (scrollMousePoint.X - e.GetPosition(scrollViewer).X));
// This works
}
private void myListBox_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
scrollViewer.ReleaseMouseCapture();
if (scrollMousePoint == Mouse.GetPosition(scrollViewer))
{
// Click
// Here I want to get and select the ListBoxItem that was pressed.
}
}
I want to get and select the ListBoxItem that was clicked.我想得到和 select 被点击的 ListBoxItem 。
To determine if it is a click without movement, I compare if the position saved in the PreviewMouseLeftButtonDown and in PreviewMouseLeftButtonUp events are the same.为了确定它是否是没有移动的点击,我比较了保存在 PreviewMouseLeftButtonDown 和 PreviewMouseLeftButtonUp 事件中的 position 是否相同。
Here you go:这里是 go:
private void myListBox_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
scrollViewer.ReleaseMouseCapture();
if (scrollMousePoint == Mouse.GetPosition(scrollViewer))
{
ListBox listBox = sender as ListBox;
if (listBox != null)
{
var element = VisualTreeHelper.HitTest(listBox, scrollMousePoint).VisualHit;
if (element.GetType() != typeof(ScrollViewer))
{
while (element.GetType() != typeof(ListBoxItem))
element = VisualTreeHelper.GetParent(element);
(element as ListBoxItem).IsSelected = true;
}
}
}
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.