bool DragUtil::PerformDrag(Object::Pointer draggedItem,
const Rectangle& sourceBounds, const Point& initialLocation,
bool allowSnapping)
{
IDropTarget::Pointer target = DragToTarget(draggedItem, sourceBounds,
initialLocation, allowSnapping);
if (target == 0)
{
return false;
}
target->Drop();
target->DragFinished(true);
return true;
}
IDropTarget::Pointer DragUtil::DragToTarget(Object::Pointer draggedItem,
const Rectangle& sourceBounds, const Point& initialLocation,
bool allowSnapping)
{
//final Display display = Display.getCurrent();
// Testing...immediately 'drop' onto the test target
if (forcedDropTarget != 0)
{
Point location = forcedDropTarget->GetLocation();
void* currentControl =
Tweaklets::Get(GuiWidgetsTweaklet::KEY)->FindControl(
forcedDropTarget->GetShells(), location);
return GetDropTarget(currentControl, draggedItem, location, sourceBounds);
}
// Create a tracker. This is just an XOR rect on the screen.
// As it moves we notify the drag listeners.
ITracker* tracker = Tweaklets::Get(DnDTweaklet::KEY)->CreateTracker();
//tracker.setStippled(true);
GuiTk::IControlListener::Pointer trackerListener(new TrackerMoveListener(
draggedItem, sourceBounds, initialLocation, allowSnapping));
tracker->AddControlListener(trackerListener);
// Setup...when the drag starts we might already be over a valid target, check this...
// If there is a 'global' target then skip the check
IDropTarget::Pointer target;
void* startControl =
Tweaklets::Get(GuiWidgetsTweaklet::KEY)->GetCursorControl();
if (startControl != 0 && allowSnapping)
{
target = GetDropTarget(startControl, draggedItem, initialLocation,
sourceBounds);
}
// Set up an initial tracker rectangle
Rectangle startRect = sourceBounds;
if (target != 0)
{
Rectangle rect = target->GetSnapRectangle();
if (rect.width != 0 && rect.height != 0)
{
startRect = rect;
}
tracker->SetCursor(target->GetCursor());
}
if (startRect.width != 0 && startRect.height != 0)
{
tracker->SetRectangle(startRect);
}
// Tracking Loop...tracking is preformed on the 'SWT.Move' listener registered
// against the tracker.
// // HACK:
// // Some control needs to capture the mouse during the drag or other
// // controls will interfere with the cursor
// Shell shell = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell();
// if (shell != null)
// {
// shell.setCapture(true);
// }
// Run tracker until mouse up occurs or escape key pressed.
bool trackingOk = tracker->Open();
// // HACK:
// // Release the mouse now
// if (shell != null)
// {
// shell.setCapture(false);
// }
// Done tracking...
// Get the current drop target
IDropTarget::Pointer dropTarget;
Point finalLocation =
Tweaklets::Get(GuiWidgetsTweaklet::KEY)->GetCursorLocation();
void* targetControl =
Tweaklets::Get(GuiWidgetsTweaklet::KEY)->GetCursorControl();
dropTarget = GetDropTarget(targetControl, draggedItem, finalLocation,
tracker->GetRectangle());
// Cleanup...
delete tracker;
// if we're going to perform a 'drop' then delay the issuing of the 'finished'
// callback until after it's done...
if (trackingOk)
{
return dropTarget;
}
else if (dropTarget != 0)
{
// If the target can handle a 'finished' notification then send one
dropTarget->DragFinished(false);
}
return IDropTarget::Pointer(0);
}