Пример #1
0
        private static bool ShouldStartDraggingControl( int x, int y )
        {
            // We're not holding a control down..
            if (m_LastPressedControl == null) 
                return false;

            // Not been dragged far enough
            int length = Math.Abs(x - m_LastPressedPos.X) + Math.Abs(y - m_LastPressedPos.Y);
            if (length < 5) 
                return false;

            // Create the dragging package

            CurrentPackage = m_LastPressedControl.DragAndDrop_GetPackage(m_LastPressedPos.X, m_LastPressedPos.Y);

            // We didn't create a package!
            if (CurrentPackage == null)
            {
                m_LastPressedControl = null;
                SourceControl = null;
                return false;
            }

            // Now we're dragging something!
            SourceControl = m_LastPressedControl;
            InputHandler.MouseFocus = null;
            m_LastPressedControl = null;
            CurrentPackage.DrawControl = null;

            // Some controls will want to decide whether they should be dragged at that moment.
            // This function is for them (it defaults to true)
            if (!SourceControl.DragAndDrop_ShouldStartDrag())
            {
                SourceControl = null;
                CurrentPackage = null;
                return false;
            }

            SourceControl.DragAndDrop_StartDragging(CurrentPackage, m_LastPressedPos.X, m_LastPressedPos.Y);

            return true;
        }