ASP.NET编写组件控件实例：多列下拉框和鼠标相关组件(2)

时间:2009-12-21 11:47来源:未知作者:admin 点击: 次

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/// summary /// 鼠标按下事件 /// /summary /// paramname="sender"/param /// paramname="e"/param private void SizableControl_MouseDown( object sender,MouseEventArgse) { if ( ! m_Enable) return ; m

       /// <summary>
        /// 鼠标按下事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void SizableControl_MouseDown(object sender, MouseEventArgs e)
        {
            if (!m_Enable)
                return;

            m_ResizeOriginalPoint = Control.MousePosition;
        }

        /// <summary>
        /// 鼠标移动事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void SizableControl_MouseMove(object sender, MouseEventArgs e)
        {
            if (!m_Enable)
                return;

            if (e.Button == MouseButtons.None)
            {
                this.CheckMousePoint(sender as Control, e.Location);
                return;
            }

            if (e.Button != MouseButtons.Left)
                return;

            Point OffsetPoint = Control.MousePosition;
            OffsetPoint.Offset(-m_ResizeOriginalPoint.X, -m_ResizeOriginalPoint.Y);

            switch (m_HandleArea)
            {
                case ResizeHandleAreaEnum.TopLeft:
                    this.SetControlBound(OffsetPoint.X, OffsetPoint.Y, -OffsetPoint.X, -OffsetPoint.Y);
                    break;
                case ResizeHandleAreaEnum.TopCenter:
                    this.SetControlBound(0, OffsetPoint.Y, 0, -OffsetPoint.Y);
                    break;
                case ResizeHandleAreaEnum.TopRight:
                    this.SetControlBound(0, OffsetPoint.Y, OffsetPoint.X, -OffsetPoint.Y);
                    break;
                case ResizeHandleAreaEnum.CenterLeft:
                    this.SetControlBound(OffsetPoint.X, 0, -OffsetPoint.X, 0);
                    break;
                case ResizeHandleAreaEnum.CenterRight:
                    this.SetControlBound(0, 0, OffsetPoint.X, 0);
                    break;
                case ResizeHandleAreaEnum.BottomLeft:
                    this.SetControlBound(OffsetPoint.X, 0, -OffsetPoint.X, OffsetPoint.Y);
                    break;
                case ResizeHandleAreaEnum.BottomCenter:
                    this.SetControlBound(0, 0, 0, OffsetPoint.Y);
                    break;
                case ResizeHandleAreaEnum.BottomRight:
                    this.SetControlBound(0, 0, OffsetPoint.X, OffsetPoint.Y);
                    break;
                case ResizeHandleAreaEnum.Center:
                default:
                    break;
            }

            this.m_ResizeOriginalPoint = Control.MousePosition;
        }

        /// <summary>
        /// 鼠标离开事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void SizableControl_MouseLeave(object sender, EventArgs e)
        {
            if (!m_Enable)
                return;

            (sender as Control).Cursor = Cursors.Default;
            this.m_ResizableControl.Cursor = Cursors.Default;
        }

其他方法都是辅助检测和调整坐标用的。下面介绍如何实现自定义的UITypeEditor。这里定义了一个枚举ResizeHandleAreaEnum，用来标识调整大小的区域。因为设置的响应操作的区域允许有多个，所以这些枚举值必须都是2的次方数，在二进制中表示则都只有一位是1的，这样就可以通过位操作来解析值了。