EyesBaby功能实现之窗口拖拽与缩放功能

Winform中窗体拖拽主要由鼠标移动事件(MouseMove)、鼠标按下事件(MouseDown)和鼠标释放事件(MouseUp)完成。

以下详细代码：

        private Point mouseOffset; //记录鼠标指针的坐标

        /// <summary>
        /// 鼠标移动事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            if (isMouseDown)
            {
                Point mousePos = Control.MousePosition;
                mousePos.Offset(mouseOffset.X, mouseOffset.Y);
                // 设置窗口位置等于鼠标移动位置
                Location = mousePos;
            }
        }

        /// <summary>
        /// 鼠标按下事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            int xOffset;
            int yOffset;

            if (e.Button == MouseButtons.Left)
            {
                xOffset = -e.X - SystemInformation.FrameBorderSize.Width;
                yOffset = -e.Y - SystemInformation.CaptionHeight -
                SystemInformation.FrameBorderSize.Height;
                mouseOffset = new Point(xOffset, yOffset);
                isMouseDown = true;
            }

        }

        /// <summary>
        /// 鼠标释放事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_MouseUp(object sender, MouseEventArgs e)
        {
            // 修改鼠标状态isMouseDown的值
            // 确保只有鼠标左键按下并移动时，才移动窗体
            if (e.Button == MouseButtons.Left)
            {
                isMouseDown = false;
            }

        }

鼠标滚动轴控制窗口大小：

需要实现鼠标滑动滚动轴事件(MouseWheel)。事件参数MouseEventArgs.Delta值分别是120和-120.

代码如下：

 

        /// <summary>
        /// 鼠标滑动滚动轴事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void Form1_MouseWheel(object sender, MouseEventArgs e)
        {
            Size t = pictureBox1.Size;
            t.Width += e.Delta;
            t.Height += e.Delta;
            // 控制窗口宽度大于100px
            if (e.Delta==120||(this.Size.Height > 100 && this.Size.Width > 200))
                this.Size = t;
            // 消息提示居中
            lblMsg.Location = new Point((this.Width - lblMsg.Width) / 2, (this.Height - lblMsg.Height) / 2);

        }

实际上EyesBaby中是通过图片控件来控制窗体的大小和拖动位置。