private void ThumbDragStarted(object sender, DragStartedEventArgs e)
{
if (sender is Thumb thumb)
{
var resizeHandle = (ResizeHandlePosition)Enum.Parse(typeof(ResizeHandlePosition), (string)thumb.Tag);
ResizeStarted?.Invoke(this, new ResizeStartedEventArgs(resizeHandle));
}
}
private Thumb BuildAdornerCorner(Cursor cursor, DragDeltaEventHandler dragHandler)
{
var thumb = new Thumb();
// TODO: this thumb should be styled to look like a dotted triangle,
// similar to the one you can see on the bottom right corner of
// Internet Explorer window
thumb.Cursor = cursor;
thumb.Height = thumb.Width = 10;
thumb.Opacity = 0.40;
thumb.Background = new SolidColorBrush(Colors.MediumBlue);
thumb.DragDelta += dragHandler;
thumb.DragStarted += (s, e) =>
{
ResizeStarted?.Invoke(this, e);
};
thumb.DragCompleted += (s, e) =>
{
ResizeCompleted?.Invoke(this, e);
};
_visualChildren.Add(thumb);
return(thumb);
}
