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【CSharp】限制窗体不能移到屏幕外

作者:kunkun0921 / 发布于2015/1/26/ 598


	using System;
	using System.Collections.Generic;
	using System.Linq;
	using System.Text;
	using System.Windows.Forms;
	using System.Drawing;
	using System.Runtime.InteropServices;

	namespace AppForm
	{
	 /// <summary>
	 /// WinForm程序限制窗体不能移到屏幕外
	 /// </summary>
	 public class FrmBase : Form
	 {
	 private Point _mouseDownPos;

	 private bool _move;

	 protected override void WndProc(ref Message m)
	 {

	 RECT nativeRect;

	

	 switch (m.Msg)
	 {

	 case 0x20:

	 int lp = m.LParam.ToInt32();

	

	 if ((lp & 0xFFFF) == 2 &&

	 ((lp >> 0x10) & 0xFFFF) == 0x201)
	 {

	 _mouseDownPos = Control.MousePosition;

	 _move = true;

	 }

	 break;

	 case 0x231:

	 if (_move)
	 {

	 Rectangle rect = Screen.GetWorkingArea(this);

	

	 nativeRect = new RECT(

	 _mouseDownPos.X - Location.X,

	 _mouseDownPos.Y - Location.Y,

	 rect.Right - (Bounds.Right - _mouseDownPos.X),

	 rect.Bottom - (Bounds.Bottom - _mouseDownPos.Y));

	

	 ClipCursor(ref nativeRect);

	 }

	 break;

	 case 0x0232:

	 if (_move)
	 {

	 nativeRect = new RECT(Screen.GetWorkingArea(this));

	 ClipCursor(ref nativeRect);

	 _move = false;

	 }

	 break;

	 }

	

	 base.WndProc(ref m);

	 }

	 [DllImport("user32.dll")]
	 public static extern bool ClipCursor(ref RECT lpRect);

	 [StructLayout(LayoutKind.Sequential)]
	 public struct RECT
	 {
	 public int Left;
	 public int Top;
	 public int Right;
	 public int Bottom;

	 public RECT(int left, int top, int right, int bottom)
	 {
	 Left = left;
	 Top = top;
	 Right = right;
	 Bottom = bottom;
	 }

	 public RECT(Rectangle rect)
	 {
	 Left = rect.Left;
	 Top = rect.Top;
	 Right = rect.Right;
	 Bottom = rect.Bottom;
	 }

	 public Rectangle Rect
	 {
	 get
	 {
	 return new Rectangle(
	 Left,
	 Top,
	 Right - Left,
	 Bottom - Top);

	 }

	 }

	 public Size Size
	 {
	 get
	 {

	 return new Size(Right - Left, Bottom - Top);

	 }

	 }

	 public static RECT FromXYWH(int x, int y, int width, int height)
	 {
	 return new RECT(x,
	 y,
	 x + width,
	 y + height);
	 }

	 public static RECT FromRectangle(Rectangle rect)
	 {
	 return new RECT(rect.Left,
	 rect.Top,
	 rect.Right,
	 rect.Bottom);
	 }

	 }

	
	 }
	}

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