private void BeginDrag()
{
if (currentDragEvent != null)
{
return;
}
if (m_MouseDownElements.size == 0)
{
return;
}
mouseState.leftMouseButtonState.isDrag = mouseState.isLeftMouseDown;
mouseState.rightMouseButtonState.isDrag = mouseState.isRightMouseDown;
mouseState.middleMouseButtonState.isDrag = mouseState.isMiddleMouseDown;
IsDragging = true;
m_EventPropagator.Reset(mouseState);
m_EventPropagator.origin = m_MouseDownElements.array[0];
for (int i = 0; i < m_MouseDownElements.Count; i++)
{
UIElement element = m_MouseDownElements[i];
if (element.isDestroyed || element.isDisabled || element.inputHandlers == null)
{
continue;
}
if ((element.inputHandlers.handledEvents & InputEventType.DragCreate) == 0)
{
continue;
}
for (int creatorIndex = 0; creatorIndex < element.inputHandlers.dragCreators.size; creatorIndex++)
{
InputHandlerGroup.DragCreatorData data = element.inputHandlers.dragCreators.array[creatorIndex];
currentDragEvent = data.handler.Invoke(new MouseInputEvent(m_EventPropagator, InputEventType.DragCreate, m_KeyboardState.modifiersThisFrame, false, element));
if (currentDragEvent != null)
{
currentDragEvent.StartTime = Time.realtimeSinceStartup;
currentDragEvent.DragStartPosition = MousePosition;
currentDragEvent.origin = element;
currentDragEvent.Begin();
UpdateDrag(true);
return;
}
}
}
if (currentDragEvent == null)
{
IsDragging = false;
}
// todo -- capture phase
}