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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace tc
{
public partial class Form4 : Form
{
//将被拖动的控件
private Control control;
public Form4()
{
InitializeComponent();
//this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form4_Paint);
this.Paint += new System.Windows.Forms.PaintEventHandler(this.panel1_Paint);
control = new Button();
control.MouseDown += new MouseEventHandler(button1_MouseDown);
control.MouseMove += new MouseEventHandler(button1_MouseMove);
control.MouseUp += new MouseEventHandler(button1_MouseUp);
this.Controls.Add(control);
}
//鼠标按下坐标(control控件的相对坐标)
Point mouseDownPoint = Point.Empty;
//显示拖动效果的矩形
Rectangle rect = Rectangle.Empty;
//是否正在拖拽
bool isDrag = false;
//重置变量
private void reset()
{
mouseDownPoint = Point.Empty;
rect = Rectangle.Empty;
isDrag = false;
}
//窗体重绘
private void Form4_Paint(object sender, PaintEventArgs e)
{
if (rect != Rectangle.Empty)
{
if (isDrag)
{//画一个和Control一样大小的黑框
e.Graphics.DrawRectangle(Pens.Black, rect);
}
else
{
e.Graphics.DrawRectangle(new Pen(this.BackColor), rect);
}
}
}
//把相对与control控件的坐标,转换成相对于窗体的坐标。
private Point getPointToForm(Point p)
{
return this.PointToClient(control.PointToScreen(p));
}
void button1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
mouseDownPoint = e.Location;
//记录控件的大小
rect = control.Bounds;
}
}
void button1_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
isDrag = true;
//重新设置rect的位置,跟随鼠标移动
rect.Location = getPointToForm(new Point(e.Location.X - mouseDownPoint.X, e.Location.Y - mouseDownPoint.Y));
this.Refresh();
// }
}
}
void button1_MouseUp(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
if (isDrag)
{
isDrag = false;
//移动control到放开鼠标的地方
control.Location = rect.Location;
this.Refresh();
}
reset();
}
}
private void panel1_Paint(object sender, PaintEventArgs e)
{
if (rect != Rectangle.Empty)
{
if (isDrag)
{//画一个和Control一样大小的黑框
e.Graphics.DrawRectangle(Pens.Black, rect);
}
else
{
e.Graphics.DrawRectangle(new Pen(this.BackColor), rect);
}
}
}
}
}