如何使鼠标拖动可以改变无边框的窗体的大小啊?

[dugupiaoyun]

我有一个窗体设置为无边框的，但就不能更改大小了，怎么才能和有边框的时候一样，用鼠标按着一拖就能改变大小啊.能否给个例子先(最好给个简单点的，能改变窗体的高度的就行了).

[dugupiaoyun]

帮帮忙回个贴啊!

[anningning821009]

程序实现的思路是在窗体的MouseDown事件中获取鼠标相对于窗体的坐标，在MouseOver事件中获取新的鼠标坐标值，显然这两个坐标值的差加上窗体原来的坐标，就是窗体应该移动到的新的坐标值。然后把窗体位置移动到新坐标值处即可。
private Point mouseOffset;
private bool isMouseDown = false;

private void Form2_MouseDown(object sender, System.Windows.Forms.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;
}


}

private void Form2_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
if (isMouseDown)
{
Point mousePos = Control.MousePosition;
mousePos.Offset(mouseOffset.X, mouseOffset.Y);
Location = mousePos;
}

}

private void Form2_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
{
isMouseDown=false;
}

[califord]

不会，帮你顶一下

[wantsfly]

protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
cp.Style |= 0xC0000;
return cp;
}
}

[dugupiaoyun]

用
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
cp.Style |= 0xC0000;
return cp;
}
}

确实是可以拖动了，但是我的无边框窗体成了有边框的了~~~~。
另外介绍一下...cp.Style |= 0xC0000到底是个什么东东哦?不懂！

[dugupiaoyun]

另外3楼的你写的代码可能是误解了我的题目意思了，而且你写的拖动也存在问题哦，没我自己想的好(如下):
private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
if(e.Button == MouseButtons.Left)
{
this.mousePosition.X = e.X;
this.mousePosition.Y = e.Y;
}
}

private void Form1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
if(e.Button == MouseButtons.Left)
{
this.Top = Control.MousePosition.Y - mousePosition.Y;
this.Left = Control.MousePosition.X - mousePosition.X;
}

}

[dugupiaoyun]

上面的mousePosition定义忘了写private System.Drawing.Point mousePosition=new Point(0,0);

[MyLf]

protected override void WndProc(ref System.Windows.Forms.Message m)
{
int WM_NCHITTEST = 0x0084;
int HTBOTTOMRIGHT= 17;
int HTBOTTOMLEFT = 16;
int HTCLIENT = 1;

if(m.Msg == WM_NCHITTEST)
{
int p = Control.MousePosition.X - this.Left + 2;//2为允许范围
if( p >= this.Width)//Mouse位于左边
m.Result = (IntPtr)HTBOTTOMRIGHT;
else if(p <= 2)//Mouse位于右边
m.Result = (IntPtr)HTBOTTOMLEFT;
else
m.Result = (IntPtr)HTCLIENT;
}
else
base.WndProc (ref m);
}
Mouse位于上边，下端的情况自己搞定。消息号可以查看winuser.h的定义

[dugupiaoyun]

我不是说的要移动窗体，移动窗体我有更好的方法，我是说用鼠标来改变窗体的大小，而不是窗体的位置。

[yuanzhihua520]

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