private WidgetInstance HitTest(Point mousePt, out DragMethod dragMethod)
{
if (_selectedWidget != null)
{
var dm = HitTest(_selectedWidget, mousePt);
if (dm != DragMethod.None)
{
dragMethod = dm;
return(_selectedWidget);
}
}
foreach (var widget in (from w in _widgets where w != _selectedWidget select w))
{
var dm = HitTest(widget, mousePt);
if (dm != DragMethod.None)
{
dragMethod = dm;
return(widget);
}
}
dragMethod = DragMethod.None;
return(null);
}
private void WidgetLayoutControl_MouseMove(object sender, MouseEventArgs e)
{
try
{
if (_selectedWidget != null)
{
if ((e.Button & System.Windows.Forms.MouseButtons.Left) != 0)
{
var screenPt = ScaledClientToScreen(e.Location);
var dist = screenPt.Subtract(_lastScreenPt);
if (_dragMethod != DragMethod.None)
{
_dragging = true;
}
switch (_dragMethod)
{
case DragMethod.Move:
if (_selectedWidget.OffsetBoundsSafe(dist, false))
{
Invalidate();
OnWidgetsChanged(_selectedWidget);
}
break;
case DragMethod.ResizeTopLeft:
{
var bounds = _selectedWidget.Bounds;
if (_selectedWidget.ChangeBoundsSafe(new Rectangle(bounds.Left + dist.X, bounds.Top + dist.Y, bounds.Width - dist.X, bounds.Height - dist.Y), false))
{
Invalidate();
OnWidgetsChanged(_selectedWidget);
}
}
break;
case DragMethod.ResizeTopRight:
{
var bounds = _selectedWidget.Bounds;
if (_selectedWidget.ChangeBoundsSafe(new Rectangle(bounds.Left, bounds.Top + dist.Y, bounds.Width + dist.X, bounds.Height - dist.Y), false))
{
Invalidate();
OnWidgetsChanged(_selectedWidget);
}
}
break;
case DragMethod.ResizeBottomLeft:
{
var bounds = _selectedWidget.Bounds;
if (_selectedWidget.ChangeBoundsSafe(new Rectangle(bounds.Left + dist.X, bounds.Top, bounds.Width - dist.X, bounds.Height + dist.Y), false))
{
Invalidate();
OnWidgetsChanged(_selectedWidget);
}
}
break;
case DragMethod.ResizeBottomRight:
{
var bounds = _selectedWidget.Bounds;
if (_selectedWidget.ChangeBoundsSafe(new Rectangle(bounds.Left, bounds.Top, bounds.Width + dist.X, bounds.Height + dist.Y), false))
{
Invalidate();
OnWidgetsChanged(_selectedWidget);
}
}
break;
}
_lastScreenPt = screenPt;
}
else if (e.Button == System.Windows.Forms.MouseButtons.None)
{
_dragMethod = HitTest(_selectedWidget, e.Location);
switch (_dragMethod)
{
case DragMethod.Move:
this.Cursor = Cursors.SizeAll;
break;
case DragMethod.ResizeTopLeft:
case DragMethod.ResizeBottomRight:
this.Cursor = Cursors.SizeNWSE;
break;
case DragMethod.ResizeBottomLeft:
case DragMethod.ResizeTopRight:
this.Cursor = Cursors.SizeNESW;
break;
default:
this.Cursor = Cursors.Default;
break;
}
}
else
{
this.Cursor = Cursors.Default;
}
}
}
catch (Exception ex)
{
this.ShowError(ex);
}
}
private System.Windows.Forms.Cursor DragMethodToCursor(DragMethod method)
{
return cursorsByDragMethod[(int)method];
}
protected override void OnMouseUp(MouseEventArgs e)
{
base.OnMouseUp(e);
dragStartLocation = null;
dragMethod = DragMethod.None;
}
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
if (e.Button == System.Windows.Forms.MouseButtons.None)
{
this.Cursor = DragMethodToCursor(GetDragMethod(e.Location));
}
else if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
if (dragStartLocation.HasValue)
{
AdjustLocationOrShape(e.Location);
if (dragMethod == DragMethod.None)
{
dragMethod = GetDragMethod(e.Location);
}
}
}
}
public static void SetDragMethod(DependencyObject target, DragMethod value)
{
target.SetValue(DragMethodProperty, value);
}
