使用Visual C#制作可伸缩个性化窗体

private void DrawMiddle_Left(Graphics g)
{
	Brush brush = new TextureBrush(Middle_Left, new Rectangle(0, 0, 
Middle_Left.Width, Middle_Left.Height));
	g.FillRectangle(brush, 0, TITLE_WIDTH, Middle_Left.Width, 
Height - Bottom_Middle.Height - TITLE_WIDTH);
}

public class MouseSizeRight : MouseAction
	{
		private int lx;
		public MouseSizeRight(int LocationX)
		{
			lx = LocationX;
		}

		public override void Action(int ScreenX, int ScreenY, System.Windows.Forms.Form form)
		{
			form.Width = ScreenX - lx;
			form.Invalidate();
		}
	}

public class MouseDrag : MouseAction
	{
		private int x, y;
		public MouseDrag(int hitX, int hitY)
		{
			x = hitX;
			y = hitY;
		}

		public override void Action(int ScreenX, int ScreenY, System.Windows.Forms.Form form)
		{
			form.Location = new Point(ScreenX - x, ScreenY - y);
		}
	}

//鼠标点击左上边框
if((e.X <= LEFT + 10 && e.Y <= TOP) || (e.Y <= TOP + 10 && e.X <= LEFT))
{
	mouse = new MouseSizeTopLeft(Location.X, Location.Y, Width, Height);
	return;
}

//鼠标点击系统关闭按纽
if(e.X > Width - 20 && e.Y > 6 && e.X < Width - 20 + SysButton_Min.Width && e.Y < 6 + SysButton_Min.Height)
{
	Close();
	return;
}

private void Form_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
	this.Parent.Cursor = CheckCursorType(e.X, e.Y);//改变鼠标的指针形状
	if(mouse != null)
	{
		mouse.Action(Control.MousePosition.X, Control.MousePosition.Y, this);//执行时间响应
		//注意坐标是Control.MousePosition这个静态变量给出的，它的值为鼠标在桌面上的全局坐标
	}
}

private Cursor CheckCursorType(int X, int Y)
{
	if(((X <= LEFT + 10 && Y <= TOP) || (Y <= TOP + 10 && X <= LEFT)) 
		|| ((X >= Width - RIGHT - 10 && Y >= Height - BOTTOM) 
		|| (Y >= Height - BOTTOM - 10 && X >= Width - RIGHT)))
	{
		return Cursors.SizeNWSE;
	}
	else if(((Y <= TOP + 10 && X >= Width - RIGHT) 
		|| (Y <= TOP && X >= Width - RIGHT - 10)) 
		|| ((X <= LEFT && Y >= Height - BOTTOM - 10) 
		|| (Y >= Height - BOTTOM && X <= LEFT + 10)))
	{
		return Cursors.SizeNESW;
	}
	else if(X >= Width - RIGHT || X <= LEFT)
	{
		return Cursors.SizeWE;
	}
	else if(Y >= Height - BOTTOM || Y <= TOP)
	{
		return Cursors.SizeNS;
	}
	else
	{
		return Cursors.Arrow;
	}
}

private void Form_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
{
	mouse = null;
}

private void Form_DoubleClick(object sender, System.EventArgs e)
{
	if(y > TOP && y < TITLE_WIDTH)
	{
		if(WindowState == FormWindowState.Normal)
		{
			WindowState = FormWindowState.Maximized;
			SysButton = SysButton_Restore;
			Invalidate();
		}
		else if(WindowState == FormWindowState.Maximized)
		{
			WindowState = FormWindowState.Normal;
			SysButton = SysButton_Max;
			Invalidate();
		}
	}
}