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正如您在下面看到的,我想在組件可見性發生變化時開始移動。 因爲否則我需要用戶再次點擊才能開始移動,並且這對我的應用程序來說可用性很差。如何在Thumb上提高DragDelta事件
public MoveILayoutControl()
{
InitializeComponent();
this.IsVisibleChanged += new DependencyPropertyChangedEventHandler(MoveILayoutControl_IsVisibleChanged);
this.moveThumb.DragDelta += new DragDeltaEventHandler(MoveThumb_DragDelta);
}
void MoveILayoutControl_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
{
if (this.IsVisible)
{
// Raise Drag Event !?
}
}
private void MoveThumb_DragDelta(object sender, DragDeltaEventArgs e)
{
var myData = DataContext as ILayoutVisual;
if (myData != null)
{
Point dragDelta = new Point(e.HorizontalChange, e.VerticalChange);
if (myData.Rotation != 0)
{
Matrix toCalculate = ((this.Parent as FrameworkElement).RenderTransform).Value;
if (toCalculate != null)
{
dragDelta = toCalculate.Transform(dragDelta);
}
}
myData.X += dragDelta.X;
myData.Y += dragDelta.Y;
}
}