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);
}