FReply STrack::OnMouseMove( const FGeometry& MyGeometry, const FPointerEvent& MouseEvent )
{
if (bDraggingBar && OnBarDrag.IsBound())
{
/** Update drag bar position if we are dragging */
FVector2D CursorPos = MyGeometry.AbsoluteToLocal( MouseEvent.GetScreenSpacePosition() );
float NewDataPos = FMath::Clamp( LocalToDataX(CursorPos.X, MyGeometry), TrackMinValue.Get(), TrackMaxValue.Get() );
OnBarDrag.Execute(DraggableBarIndex, NewDataPos);
}
else if(DraggableBars.IsBound())
{
/** Update what bar is draggable if we arent already dragging */
UpdateDraggableBarIndex(MyGeometry, MouseEvent.GetScreenSpacePosition());
}
return FReply::Unhandled();
}
// drag drop relationship
FReply STrack::OnDrop( const FGeometry& MyGeometry, const FDragDropEvent& DragDropEvent )
{
FVector2D CursorPos = MyGeometry.AbsoluteToLocal(DragDropEvent.GetScreenSpacePosition());
float CusorDataPos = LocalToDataX(CursorPos.X, MyGeometry);
// Handle TrackNodes that were dropped
if ( DragDrop::IsTypeMatch<FTrackNodeDragDropOp>( DragDropEvent.GetOperation() ) )
{
TSharedPtr<FTrackNodeDragDropOp> DragDropOp = StaticCastSharedPtr<FTrackNodeDragDropOp>(DragDropEvent.GetOperation());
TSharedPtr<STrackNode> TrackNode = DragDropOp->OriginalTrackNode.Pin();
float DataPos = GetNodeDragDropDataPos(MyGeometry, DragDropEvent);
TrackNode->OnTrackNodeDragged.ExecuteIfBound( DataPos );
TrackNode->OnTrackNodeDropped.ExecuteIfBound();
}
// Call delegate to handle anything else
OnTrackDragDrop.ExecuteIfBound( DragDropEvent.GetOperation(), CusorDataPos );
return FReply::Unhandled();
}
TSharedPtr<SWidget> STrack::SummonContextMenu(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent)
{
bool SummonedContextMenu = false;
const bool bCloseWindowAfterMenuSelection = true;
FMenuBuilder MenuBuilder( bCloseWindowAfterMenuSelection, EditorActions );
FVector2D CursorPos = MouseEvent.GetScreenSpacePosition();
float DataPos = LocalToDataX( MyGeometry.AbsoluteToLocal(CursorPos).X, MyGeometry );
// Context menu for a node
int NotifyIndex = GetHitNode(MyGeometry, MyGeometry.AbsoluteToLocal(CursorPos));
if(NotifyIndex != INDEX_NONE)
{
if(TrackNodes[NotifyIndex]->OnNodeRightClickContextMenu.IsBound())
{
TrackNodes[NotifyIndex]->OnNodeRightClickContextMenu.Execute(MenuBuilder);
SummonedContextMenu = true;
}
}
// Context menu for track itself
if(OnTrackRightClickContextMenu.IsBound())
{
SummonedContextMenu = true;
OnTrackRightClickContextMenu.Execute(MenuBuilder, DataPos, DraggableBarIndex);
}
// Build the menu if we actually added anything to it
TSharedPtr<SWidget> MenuContent;
if(SummonedContextMenu)
{
MenuContent = MenuBuilder.MakeWidget();
FWidgetPath WidgetPath = MouseEvent.GetEventPath() != nullptr ? *MouseEvent.GetEventPath() : FWidgetPath();
FSlateApplication::Get().PushMenu(SharedThis(this), WidgetPath, MenuContent.ToSharedRef(), CursorPos, FPopupTransitionEffect(FPopupTransitionEffect::ContextMenu));
}
return MenuContent;
}
float STrack::GetSnappedPosForLocalPos( const FGeometry& MyGeometry, float TrackPos) const
{
float SnapPos = LocalToDataX(TrackPos, MyGeometry);
if ( DraggableBars.IsBound() )
{
float BestDist = 10.f;
for (auto SnapIter = DraggableBars.Get().CreateConstIterator(); SnapIter; ++SnapIter)
{
// Snap in screen space - not sure if this is best but seems right since its a hardcoded value atm
float ScreenDist = FMath::Abs(TrackPos - DataToLocalX( *SnapIter, MyGeometry ));
if ( ScreenDist < BestDist )
{
BestDist = ScreenDist;
SnapPos = *SnapIter;
}
}
}
return SnapPos;
}
float STrack::GetNodeDragDropDataPos( const FGeometry& MyGeometry, const FDragDropEvent& DragDropEvent )
{
float DataPos = 0.f;
TSharedPtr<FTrackNodeDragDropOp> DragDropOp = StaticCastSharedPtr<FTrackNodeDragDropOp>(DragDropEvent.GetOperation());
if(DragDropOp.IsValid())
{
TSharedPtr<STrackNode> TrackNode = DragDropOp->OriginalTrackNode.Pin();
if(TrackNode.IsValid())
{
FVector2D CursorPos = MyGeometry.AbsoluteToLocal(TrackNode->GetDragDropScreenSpacePosition(MyGeometry, DragDropEvent));
DataPos = LocalToDataX(CursorPos.X, MyGeometry);
if(TrackNode->SnapToDragBars())
{
float OriginalX = DataPos;
DataPos = GetSnappedPosForLocalPos(MyGeometry, CursorPos.X);
TrackNode->OnSnapNodeDataPosition(OriginalX, DataPos);
}
}
}
return DataPos;
}
