public virtual void ProcessLeftButtonDown()
{
if (_rightButtonDown)
return;
Selector = null;
_diagram.CaptureMouse();
_leftButtonDown = true;
_leftButtonAction = MouseAction.None;
ResetIsUnderCursor(_currentMousePosition.HasValue ? _currentMousePosition.Value : new Point(0, 0));
_mouseDownOnItem = _itemUnderCursor;
if (_diagram.Edges.Count != 0)
{
bool res = _diagram.Edges[0].HitTest(_currentMousePosition.Value);
}
if (_diagram.Selection.Contains(_itemUnderCursor) || _currentResizeDirection != ResizeDirection.None)
{
_leftButtonAction = MouseAction.MoveItem;
}
else
{
if (_mouseDownOnItem as DiagramNode != null || (_mouseDownOnItem as DiagramLabel != null
&& (_mouseDownOnItem as DiagramLabel).Owner as DiagramNode != null))
{
_leftButtonAction = MouseAction.CreateEdge;
}
else
{
_leftButtonAction = MouseAction.MultiSelect;
}
}
_leftButtonDownMousePosition = _currentMousePosition;
}
private void ExpandSelector(Point mousePosition, bool createSelector)
{
if (Selector == null)
{
if (createSelector)
{
Selector = new DiagramSelector();
Selector.StartPoint = mousePosition;
}
return;
}
Selector.EndPoint = mousePosition;
_diagram.InvalidateVisual();
}
private void UseSelector()
{
if (Selector == null)
return;
using (DiagramUpdateLock locker = new DiagramUpdateLock(_diagram))
{
Geometry selectorGeometry = Selector.Geometry;
_diagram.Selection.Clear();
foreach (var node in _diagram.Nodes)
{
if (node.Geometry == null || node.NeedRecalc)
node.CalculateGeometry();
if (node.Geometry == null)
continue;
if (GeometryUtils.AreIntersectOrContain(node.Geometry, node.BorderPen,
selectorGeometry, GlobalData.SelectorBorderPen))
{
_diagram.Selection.Add(node);
}
}
Selector = null;
}
}
public virtual void ProcessLeftButtonUp()
{
if (_offsetWorker != null)
{
_offsetWorker.CancelAsync();
//_offsetWorker.
//while (_offsetWorker.IsBusy) { }
_offsetWorker = null;
}
if (_leftButtonDown && _leftButtonDownMousePosition != null && _currentMousePosition != null)
{
var isMouseMoved = MathUtils.Compare(GeometryUtils.Distance(_leftButtonDownMousePosition.Value, _currentMousePosition.Value), 0, GlobalData.PointPrecision) != 0;
if (!isMouseMoved)
{
ResetIsUnderCursor(_currentMousePosition.Value);
var selectionSucceded = SelectItem(_itemUnderCursor);
if (!selectionSucceded)
{
CreateNode(_currentMousePosition.Value);
}
else
{
RaiseLButtonClick();
}
}
else if (_leftButtonAction == MouseAction.MoveItem)
{
ResizeDirection direction = _currentResizeDirection;
_currentResizeDirection = ResizeDirection.None;
SetupSelectionEdgesEndings(direction);
}
else if (_leftButtonAction == MouseAction.MultiSelect)
{
UseSelector();
}
ChangeCursorKind(_currentMousePosition.Value);
}
_diagram.ReleaseMouseCapture();
Selector = null;
_leftButtonDown = false;
_leftButtonDownMousePosition = null;
_leftButtonAction = MouseAction.None;
}