C# WinForm 拖动无边框窗体 改变无边框窗体尺寸

经常遇到这种情况、窗体的边框去掉了、然后种种问题就出来了：
不能拖动、
不能改变窗体大小、
不能．．．．．．
当然、肯定有解决方案滴*＾_＾*
今天的目标就是：
可以直接拖动没有边框的窗体、
可以直接拉拽窗体改变其大小、
制作步骤如下：
新建WinForm程序、添加一个启动的窗体、
将其边框设置为None、
进入代码编辑界面、
定义如下常量值：
const int Guying_HTLEFT = 10;
const int Guying_HTRIGHT = 11;
const int Guying_HTTOP = 12;
const int Guying_HTTOPLEFT = 13;
const int Guying_HTTOPRIGHT = 14;
const int Guying_HTBOTTOM = 15;
const int Guying_HTBOTTOMLEFT = 0x10;
const int Guying_HTBOTTOMRIGHT = 17;
定义用于设置的常量值
重写系统WndProc函数：
protected override void WndProc(ref Message m)
{
switch (m.Msg)
{
case 0x0084:
base.WndProc(ref m);
Point vPoint = new Point((int)m.LParam & 0xFFFF,
(int)m.LParam >> 16 & 0xFFFF);
vPoint = PointToClient(vPoint);
if (vPoint.X <= 5)
if (vPoint.Y <= 5)
m.Result = (IntPtr)Guying_HTTOPLEFT;
else if (vPoint.Y >= ClientSize.Height - 5)
m.Result = (IntPtr)Guying_HTBOTTOMLEFT;
else m.Result = (IntPtr)Guying_HTLEFT;
else if (vPoint.X >= ClientSize.Width - 5)
if (vPoint.Y <= 5)
m.Result = (IntPtr)Guying_HTTOPRIGHT;
else if (vPoint.Y >= ClientSize.Height - 5)
m.Result = (IntPtr)Guying_HTBOTTOMRIGHT;
else m.Result = (IntPtr)Guying_HTRIGHT;
else if (vPoint.Y <= 5)
m.Result = (IntPtr)Guying_HTTOP;
else if (vPoint.Y >= ClientSize.Height - 5)
m.Result = (IntPtr)Guying_HTBOTTOM;
break;
case 0x0201: //鼠标左键按下的消息
m.Msg = 0x00A1; //更改消息为非客户区按下鼠标
m.LParam = IntPtr.Zero; //默认值
m.WParam = new IntPtr(2);//鼠标放在标题栏内
base.WndProc(ref m);
break;
default:
base.WndProc(ref m);
break;
}
}
重写系统WndProc函数
OK、运行一下看看效果吧、可以拖动、可以拖拽窗体改变尺寸、、、
呵呵、
完整代码如下：
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 Demo
{
public partial class Frm_Main : Form
{
public Frm_Main()
{
InitializeComponent();
StartPosition = FormStartPosition.CenterScreen;
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
}
const int Guying_HTLEFT = 10;
const int Guying_HTRIGHT = 11;
const int Guying_HTTOP = 12;
const int Guying_HTTOPLEFT = 13;
const int Guying_HTTOPRIGHT = 14;
const int Guying_HTBOTTOM = 15;
const int Guying_HTBOTTOMLEFT = 0x10;
const int Guying_HTBOTTOMRIGHT = 17;
protected override void WndProc(ref Message m)
{
switch (m.Msg)
{
case 0x0084:
base.WndProc(ref m);
Point vPoint = new Point((int)m.LParam & 0xFFFF,
(int)m.LParam >> 16 & 0xFFFF);
vPoint = PointToClient(vPoint);
if (vPoint.X <= 5)
if (vPoint.Y <= 5)
m.Result = (IntPtr)Guying_HTTOPLEFT;
else if (vPoint.Y >= ClientSize.Height - 5)
m.Result = (IntPtr)Guying_HTBOTTOMLEFT;
else m.Result = (IntPtr)Guying_HTLEFT;
else if (vPoint.X >= ClientSize.Width - 5)
if (vPoint.Y <= 5)
m.Result = (IntPtr)Guying_HTTOPRIGHT;
else if (vPoint.Y >= ClientSize.Height - 5)
m.Result = (IntPtr)Guying_HTBOTTOMRIGHT;
else m.Result = (IntPtr)Guying_HTRIGHT;
else if (vPoint.Y <= 5)
m.Result = (IntPtr)Guying_HTTOP;
else if (vPoint.Y >= ClientSize.Height - 5)
m.Result = (IntPtr)Guying_HTBOTTOM;
break;
case 0x0201: //鼠标左键按下的消息
m.Msg = 0x00A1; //更改消息为非客户区按下鼠标
m.LParam = IntPtr.Zero; //默认值
m.WParam = new IntPtr(2);//鼠标放在标题栏内
base.WndProc(ref m);
break;
default:
base.WndProc(ref m);
break;
}
}
}
}
完整代码