FReply SDockingTabWell::StartDraggingTab( TSharedRef<SDockTab> TabToStartDragging, FVector2D InTabGrabOffsetFraction, const FPointerEvent& MouseEvent )
{
Tabs.Remove(TabToStartDragging);
// We just removed the foreground tab.
ForegroundTabIndex = INDEX_NONE;
ParentTabStackPtr.Pin()->OnTabRemoved(TabToStartDragging->GetLayoutIdentifier());
// Tha tab well keeps track of which tab we are dragging; we treat is specially during rendering and layout.
TabBeingDraggedPtr = TabToStartDragging;
TabGrabOffsetFraction = InTabGrabOffsetFraction;
// We are about to start dragging a tab, so make sure its offset is correct
this->ChildBeingDraggedOffset = ComputeDraggedTabOffset( MouseEvent.FindGeometry(SharedThis(this)), MouseEvent, InTabGrabOffsetFraction );
// Start dragging.
TSharedRef<FDockingDragOperation> DragDropOperation =
FDockingDragOperation::New(
TabToStartDragging,
InTabGrabOffsetFraction,
GetDockArea().ToSharedRef(),
ParentTabStackPtr.Pin()->GetTabStackGeometry().Size
);
return FReply::Handled().BeginDragDrop( DragDropOperation );
}
FReply SDockingTabWell::StartDraggingTab( TSharedRef<SDockTab> TabToStartDragging, FVector2D InTabGrabOffsetFraction, const FPointerEvent& MouseEvent )
{
const bool bCanLeaveTabWell = TabToStartDragging->GetTabManager()->GetPrivateApi().CanTabLeaveTabWell( TabToStartDragging );
// We are about to start dragging a tab, so make sure its offset is correct
this->ChildBeingDraggedOffset = ComputeDraggedTabOffset( MouseEvent.FindGeometry(SharedThis(this)), MouseEvent, InTabGrabOffsetFraction );
// Tha tab well keeps track of which tab we are dragging; we treat is specially during rendering and layout.
TabBeingDraggedPtr = TabToStartDragging;
TabGrabOffsetFraction = InTabGrabOffsetFraction;
Tabs.Remove(TabToStartDragging);
if (bCanLeaveTabWell)
{
// We just removed the foreground tab.
ForegroundTabIndex = INDEX_NONE;
ParentTabStackPtr.Pin()->OnTabRemoved(TabToStartDragging->GetLayoutIdentifier());
#if PLATFORM_MAC
// On Mac we need to activate the app as we may be dragging a window that is set to be invisible if the app is inactive
FPlatformMisc::ActivateApplication();
#endif
// Start dragging.
TSharedRef<FDockingDragOperation> DragDropOperation =
FDockingDragOperation::New(
TabToStartDragging,
InTabGrabOffsetFraction,
GetDockArea().ToSharedRef(),
ParentTabStackPtr.Pin()->GetTabStackGeometry().Size
);
return FReply::Handled().BeginDragDrop( DragDropOperation );
}
else
{
return FReply::Handled().CaptureMouse(SharedThis(this));
}
}
