private void OverlayElementMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
_isMouseDown = true;
var canvas = MyVisualTreeHelper.GetParent <Canvas>(_draggedDeviceVisual);
_dragStartPoint = e.GetPosition(canvas);
canvas.CaptureMouse();
e.Handled = true;
}
private void DragStarted()
{
_isDragging = true;
var ui = (UIElement)MyVisualTreeHelper.GetParent <ContentPresenter>(_draggedDeviceVisual);
_dragStartLeft = DynamicCanvas.GetLeft(ui);
_dragStartTop = DynamicCanvas.GetTop(ui);
SelectElement(_draggedDeviceVisual);
_overlayElement.IsDragging = true;
}
private void DrawingAreaPreviewMouseMove(object sender, MouseEventArgs e)
{
if (_isMouseDown)
{
var canvas = MyVisualTreeHelper.GetParent <ItemsControl>((FrameworkElement)e.Source);
if ((_isDragging == false) && ((Math.Abs(e.GetPosition(canvas).X - _dragStartPoint.X) > SystemParameters.MinimumHorizontalDragDistance) ||
(Math.Abs(e.GetPosition(canvas).Y - _dragStartPoint.Y) > SystemParameters.MinimumVerticalDragDistance)))
{
DragStarted();
}
if (_isDragging)
{
DragMoved(canvas);
}
}
}
private void DrawingAreaPreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
var vsender = MyVisualTreeHelper.GetParent(((FrameworkElement)e.OriginalSource), x => x.Focusable, x => x.DataContext is ISelectableElement);
if (vsender.Focusable && !_isDragging)
{
return;
}
if (_isMouseDown)
{
_isMouseDown = false;
}
if (_isDragging)
{
DragFinished(false);
e.Handled = true;
}
Mouse.Capture(null);
}
private void DragFinished(bool cancelled)
{
Mouse.Capture(null);
lock (_updaterLock)
{
if (_isDragging)
{
if (cancelled == false)
{
var ui = (UIElement)MyVisualTreeHelper.GetParent <ContentPresenter>(_draggedDeviceVisual);
DynamicCanvas.SetTop(ui, _dragStartTop + _overlayElement.TopOffset);
DynamicCanvas.SetLeft(ui, _dragStartLeft + _overlayElement.LeftOffset);
}
SelectElement(_draggedDeviceVisual);
_overlayElement.IsDragging = false;
}
_isDragging = false;
_isMouseDown = false;
}
}
private void DrawingAreaPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
var vsender = MyVisualTreeHelper.GetParent(((FrameworkElement)e.OriginalSource), x => x.Focusable, x => x.DataContext is ISelectableElement);
if (vsender == null)
{
SelectElement(null);
return;
}
if (vsender.Focusable)
{
return;
}
var canvas = MyVisualTreeHelper.GetParent <ItemsControl>((FrameworkElement)e.Source);
_isMouseDown = true;
_dragStartPoint = e.GetPosition(canvas);
_draggedDeviceVisual = vsender;
SelectElement(vsender);
canvas.CaptureMouse();
e.Handled = true;
}