void OnMouseDown(MouseDownEvent evt)
{
if (s_CurrentlyActiveBuilderDragger != null && s_CurrentlyActiveBuilderDragger != this)
{
return;
}
var target = evt.currentTarget as VisualElement;
if (m_WeStartedTheDrag && target.HasMouseCapture())
{
evt.StopImmediatePropagation();
evt.PreventDefault();
return;
}
if (!CanStartManipulation(evt))
{
return;
}
var stopEvent = StopEventOnMouseDown(evt);
if (stopEvent)
{
evt.StopImmediatePropagation();
}
if (target.HasMouseCapture())
{
if (!stopEvent)
{
evt.StopImmediatePropagation();
}
return;
}
s_CurrentlyActiveBuilderDragger = this;
m_Start = evt.mousePosition;
m_WeStartedTheDrag = true;
target.CaptureMouse();
}
void OnMouseUp(MouseUpEvent evt)
{
if (evt.button != (int)MouseButton.LeftMouse)
{
evt.StopPropagation();
evt.PreventDefault();
return;
}
var target = evt.currentTarget as VisualElement;
if (!CanStopManipulation(evt))
{
return;
}
target.ReleaseMouse();
s_CurrentlyActiveBuilderDragger = null;
m_WeStartedTheDrag = false;
if (!m_Active)
{
SelectItemOnSingleClick(evt);
return;
}
if (m_Active)
{
var currentMouse = evt.mousePosition;
if (m_LastHoverElement != null)
{
var localCanvasMouse = viewport != null?m_Canvas.WorldToLocal(currentMouse) : Vector2.zero;
var localHierarchyMouse = builderHierarchyRoot != null?builderHierarchyRoot.WorldToLocal(currentMouse) : Vector2.zero;
if (viewport != null && m_Canvas.ContainsPoint(localCanvasMouse))
{
PerformAction(m_LastHoverElement, DestinationPane.Viewport, localCanvasMouse, m_LastHoverElementChildIndex);
}
else if (builderHierarchyRoot != null && builderHierarchyRoot.ContainsPoint(localHierarchyMouse))
{
VisualElement newParent;
int index;
GetPickedElementFromHoverElement(out newParent, out index);
PerformAction(newParent, DestinationPane.Hierarchy, localHierarchyMouse, index);
}
}
m_Active = false;
}
else
{
FailAction(target);
}
evt.StopPropagation();
EndDragInner();
}