在StatusBar上有一个可以拖动窗体大小的手柄,鼠标在其上拖动时就可以调整当前窗体的大小,如何自己来仿制一个呢,我作了一个小控件就可以实现了,只是效果上相似,至于系统里到底是怎么来实现的,我是不知道的了,下面是控件的代码,没有写注释,因为怕有人笑我,呵呵,其实简单的不用写注释了:
using System; using System.Drawing; using System.Windows.Forms;
namespace Size_MoveCtr { /// <summary> /// Mover 的摘要说明。 /// </summary> public class SizeGrip: System.Windows.Forms.Control { private const int WM_NCHITTEST = 0x84; private const int WM_NCLBUTTONDOWN = 0xa1;
private const int HTCLIENT = 1; private const int HTBOTTOMRIGHT = 17; private System.Drawing.Drawing2D.GraphicsPath m_Path;
[System.Runtime.InteropServices.DllImport("user32.dll")] public static extern int SendMessage( IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam );
public SizeGrip() { this.m_Path = new System.Drawing.Drawing2D.GraphicsPath();
this.m_Path.StartFigure(); this.m_Path.AddLines(new Point[]{new Point(this.Width, 0),new Point(this.Width-this.Height, this.Height), new Point(this.Width, this.Height)}); this.m_Path.CloseFigure(); }
protected override void OnPaint(PaintEventArgs e) { base.OnPaint (e); ControlPaint.DrawSizeGrip(this.CreateGraphics(), System.Drawing.SystemColors.Control, this.Width-this.Height, 0, this.Height, this.Height);
}
protected override void OnSizeChanged(EventArgs e) { System.Drawing.Drawing2D.GraphicsPath path = new System.Drawing.Drawing2D.GraphicsPath(); path.StartFigure(); path.AddLines(new Point[]{new Point(this.Width, 0),new Point(this.Width-this.Height, this.Height), new Point(this.Width, this.Height)}); path.CloseFigure();
Region reReg = new Region(path); reReg.Complement(m_Path);
this.Invalidate(reReg);
base.OnSizeChanged(e); this.m_Path = path;
ControlPaint.DrawSizeGrip(this.CreateGraphics(), System.Drawing.SystemColors.Control, this.Width-this.Height, 0, this.Height, this.Height); }
protected override void WndProc(ref Message m) { if (this.DesignMode) { base.WndProc(ref m); return; }
switch (m.Msg) { case WM_NCHITTEST: SendMessage(this.Parent.Handle, m.Msg, m.WParam, m.LParam); base.WndProc(ref m); if ((int)m.Result == HTCLIENT) { m.Result = (IntPtr)HTBOTTOMRIGHT;//右下 } break; case WM_NCLBUTTONDOWN: SendMessage(this.Parent.Handle, m.Msg, m.WParam, m.LParam); break; default: base.WndProc(ref m); break; } } } }

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