void Canvas_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
var pt = e.GetPosition(Canvas);
Canvas.Focus();
Keyboard.Focus(Canvas);
if (e.ChangedButton == MouseButton.Left)
{
switch (Mode)
{
//case XDrawingModes.Select:
case XDrawingModes.Edit:
m_DragInfo = HitTest(pt);
if (!m_DragInfo.HasValue)
{
SelectedShape = null;
}
else
{
if (m_DragInfo.Value.Shape != SelectedShape)
{
SelectedShape = m_DragInfo.Value.Shape;
}
if (m_DragInfo.Value.ControlPoint != SelectedControlPoint)
{
if (m_DragInfo.Value.ControlPoint == null || m_DragInfo.Value.ControlPoint.IsSelectable)
{
SelectedControlPoint = m_DragInfo.Value.ControlPoint;
}
}
m_DragInfo.Value.DragObject.StartDrag();
}
break;
case XDrawingModes.NewLine:
case XDrawingModes.NewRect:
case XDrawingModes.NewEllipse:
case XDrawingModes.NewPath:
case XDrawingModes.NewText:
SelectedShape = null;
XDrawingModes newMode = Mode;
switch (Mode)
{
case XDrawingModes.NewLine:
m_DragInfo = XDrawingLine.CreateNewByDrag(this, SnapToGrid(pt), out newMode);
break;
case XDrawingModes.NewRect:
m_DragInfo = XDrawingRectangle.CreateNewByDrag(this, SnapToGrid(pt), out newMode);
break;
case XDrawingModes.NewEllipse:
m_DragInfo = XDrawingEllipse.CreateNewByDrag(this, SnapToGrid(pt), out newMode);
break;
case XDrawingModes.NewPath:
m_DragInfo = XDrawingPath.CreateNewByDrag(this, SnapToGrid(pt), out newMode);
break;
case XDrawingModes.NewText:
m_DragInfo = XDrawingText.CreateNewByDrag(this, SnapToGrid(pt), out newMode);
break;
}
if (m_DragInfo.HasValue)
{
Mode = newMode;
SetValue(SelectedShapeProperty, m_DragInfo.Value.Shape);
m_Shapes.Add(m_DragInfo.Value.Shape);
Canvas.Children.Insert(Canvas.Children.IndexOf(m_ControlPointPath), m_DragInfo.Value.Shape.Path);
m_DragInfo.Value.DragObject.StartDrag();
}
break;
}
Canvas.CaptureMouse();
}
else if (e.ChangedButton == MouseButton.Right)
{
var hti = HitTest(pt);
if (!hti.HasValue)
{
SelectedShape = null;
}
else
{
if (hti.Value.Shape != SelectedShape)
{
SelectedShape = hti.Value.Shape;
}
if (hti.Value.ControlPoint != SelectedControlPoint)
{
if (hti.Value.ControlPoint == null || hti.Value.ControlPoint.IsSelectable)
{
SelectedControlPoint = hti.Value.ControlPoint;
}
}
}
}
e.Handled = true;
}