private static void OnMouseDrag(Event e)
{
#if DEBUG
if (DebugMode)
Debug.Log("DragDropManager.OnMouseDrag: " + _dragInitiator);
#endif
MouseEvent input = (MouseEvent)e;
DragEvent de;
/**
* 1) Check for drag start
* */
if (!_dragging) // if not yet dragging
{
_dragOverComponent = null;
_dragging = true; // we're dragging now
if (null != _dragInitiator) // if dragging something
{
#if DEBUG
if (DebugMode)
Debug.Log("DragEvent.DRAG_START: " + _dragInitiator);
#endif
de = BuildEvent(DragEvent.DRAG_START);
_dragInitiator.DispatchEvent(de);
}
return;
}
_dragOverComponent = CoordinateProcessor.GetComponentUnderCoordinatesOnAllStages(input.GlobalPosition, delegate(DisplayListMember dlm)
{
Component component = dlm as Component;
return null != component && component.MouseEnabled; // && !(component is Stage); // commented 20130307
}, true, true) as Component; // stopOnDisabled, stopOnInvisible
bool isDragEnter = null != _dragOverComponent &&
_dragOverComponent != _lastDragOverComponent &&
_dragInitiator != null &&
_dragInitiator != _dragOverComponent;
/**
* 2) Check for drag enter
* */
if (isDragEnter)
{
// nullify accepted target, and allow the user to react on DRAG_ENTER event (to call AcceptDragDrop)
_acceptedTarget = null;
_action = Action.None;
//Debug.Log("DragEvent.DRAG_ENTER: " + _dragOverComponent.GetType().Name);
#if DEBUG
if (DebugMode)
Debug.Log("DragEvent.DRAG_ENTER: " + _dragOverComponent.GetType().Name);
#endif
// dispatch DragEvent.DRAG_EXIT on _lastDragOverComponent
if (null != _lastDragOverComponent)
{
de = BuildEvent(DragEvent.DRAG_EXIT);
_lastDragOverComponent.DispatchEvent(de);
}
// dispatch DragEvent.DRAG_ENTER on _dragOverComponent
de = BuildEvent(DragEvent.DRAG_ENTER);
_dragOverComponent.DispatchEvent(de);
// set _lastDragOverComponent
_lastDragOverComponent = _dragOverComponent;
}
/**
* 3) Handle feedback to the user
* By this point, if the user was subscribed to DragEvent.DRAG_ENTER, he could have react with AcceptDragDrop() and (optionally) ShowFeedback()
* */
// check if the user has accepted drag and drop
if (null != _acceptedTarget)
{
// if drop is accepted, show overlay, and show CursorType.AcceptDrop cursor
Overlay.Visible = _overlayShouldBeVisible;
//_overlay.SetBounds(_acceptedTarget.GlobalBounds); // fix? .MoveBy(new Point(-1, 0)),
//Overlay.Bounds = (Rectangle)_acceptedTarget.Transform.GlobalBounds.Clone(); // consider cloning bounds 20120415
if (_feedbackShouldBeVisible)
{
if (Action.None == _action)
ChangeCursorTo(CursorType.AcceptDrop);
else
ProcessFeedback(_action);
}
else
ChangeCursorTo(CursorType.Normal);
}
else
{
// if drop is rejected (meaning not accepted by developer), hide overlay, and show CursorType.RejectDrop cursor
Overlay.Visible = false;
if (_feedbackShouldBeVisible)
ChangeCursorTo(CursorType.RejectDrop);
else
ChangeCursorTo(CursorType.Normal);
}
/**
* 4) Move proxy
* */
_proxy.X = input.GlobalPosition.X + Offset.X;
_proxy.Y = input.GlobalPosition.Y + Offset.Y;
_proxy.ValidateNow();
}
private static void ProcessFeedback(Action action)
{
switch (action)
{
case Action.Copy:
ChangeCursorTo(CursorType.DragCopy);
break;
case Action.Move:
ChangeCursorTo(CursorType.DragMove);
break;
case Action.Link:
ChangeCursorTo(CursorType.DragLink);
break;
case Action.None:
//CursorLogic.CursorLogic.Show(CursorType.RejectDrop);
//ChangeCursorTo(CursorType.NormalColor);
RemoveCursor();
break;
}
}
/**
* Sets the feedback indicator for the drag and drop operation.
* Possible values are <code>DragManager.COPY</code>, <code>DragManager.MOVE</code>,
* <code>DragManager.LINK</code>, or <code>DragManager.NONE</code>.
*
* Param: feedback The type of feedback indicator to display.
*/
public static void ShowFeedback(Action action)
{
_action = action;
}
