C#鼠标拖动控件并绘制虚框介绍

C#鼠标拖动控件并绘制虚框介绍

 

• 摘要：本文介绍C#鼠标拖动控件并绘制虚框，并提供完整的源码供参考。

效果如下：

 

C#鼠标拖动控件并绘制虚框代码如下：

private Point downPoint;

private Rectangle downRectangle;

private Rectangle lastRectangle;

 

private void pictureBox1_MouseDown(object sender, MouseEventArgs e)

{

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

    downPoint = e.Location;

    downRectangle = 

        new Rectangle(0, 0, ((Control)sender).Width, pictureBox1.Height);

    downRectangle.Offset(((Control)sender).PointToScreen(new Point(0, 0)));

    ControlPaint.DrawReversibleFrame(

        downRectangle, Color.White, FrameStyle.Thick);

    lastRectangle = downRectangle;

}

 

private void pictureBox1_MouseMove(object sender, MouseEventArgs e)

{

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

    ControlPaint.DrawReversibleFrame(

        lastRectangle, Color.White, FrameStyle.Thick);

 

    Rectangle rectangle = downRectangle;

    rectangle.Offset(e.X - downPoint.X, e.Y - downPoint.Y);

    ControlPaint.DrawReversibleFrame(

        rectangle, Color.White, FrameStyle.Thick);

    lastRectangle = rectangle;

}

 

private void pictureBox1_MouseUp(object sender, MouseEventArgs e)

{

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

    ControlPaint.DrawReversibleFrame(

        lastRectangle, Color.White, FrameStyle.Thick);

    

    pictureBox1.Location = new Point(

        ((Control)sender).Location.X + e.X - downPoint.X,

        ((Control)sender).Location.Y + e.Y - downPoint.Y);

}