Unity 程序去边框并实现拖拽窗口

文章转自：http://blog.csdn.net/xu1989101/article/details/52620546

自己前一段时间一直查找相关资料、一直都没有，百度出来的都是一模一样的最大化、最小化、无边框的功能，就是没有拖拽的功能，自己搞定了就贴代码出来，省的其它程序员走弯路。 

直接上代码，看注释。看不懂的就留言吧。

using UnityEngine;
using System.Collections;
using System;
using System.Runtime.InteropServices;
using UnityEngine.UI;

public class popuxxx : MonoBehaviour {

public Rect screenPosition;
[DllImport("user32.dll")]
static extern IntPtr SetWindowLong (IntPtr hwnd,int _nIndex ,int dwNewLong);
[DllImport("user32.dll")]
static extern bool SetWindowPos (IntPtr hWnd, int hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);
[DllImport("user32.dll")]
static extern IntPtr GetForegroundWindow ();

[DllImport("user32.dll")]
public static extern bool ReleaseCapture();
[DllImport("user32.dll")]
public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);

[DllImport("user32.dll")]
public static extern bool ShowWindow(IntPtr hwnd, int nCmdShow);

const uint SWP_SHOWWINDOW = 0x0040;
const int GWL_STYLE = -16;
const int WS_BORDER = 1;
const int WS_POPUP = 0x800000;
const int SW_SHOWMINIMIZED = 2; //{最小化, 激活}
const int SW_SHOWMAXIMIZED = 3; //{最大化, 激活}
public void btn_onclick(){ //最小化
ShowWindow(GetForegroundWindow(), SW_SHOWMINIMIZED );
}
public void btn_onclickxx(){ //最大化
ShowWindow(GetForegroundWindow(),SW_SHOWMAXIMIZED);
}
IntPtr Handle;
float xx;
bool bx;
void Start ()
{
bx = false;
xx = 0f;
#if UNITY_STANDALONE_WIN
Resolution[] r = Screen.resolutions;
screenPosition = new Rect ((r[r.Length-1].width-Screen.width)/2,(r[r.Length-1].height-Screen.height)/2,Screen.width,Screen.height);
SetWindowLong(GetForegroundWindow (), GWL_STYLE, WS_POPUP);//将网上的WS_BORDER替换成WS_POPUP
Handle = GetForegroundWindow (); //FindWindow ((string)null, "popu_windows");
SetWindowPos (GetForegroundWindow (), 0,(int)screenPosition.x,(int)screenPosition.y, (int)screenPosition.width,(int) screenPosition.height, SWP_SHOWWINDOW);
#endif
}

void Update(){
#if UNITY_STANDALONE_WIN
if (Input.GetMouseButtonDown (0)) {

xx =0f;
bx=true;
}
if(bx && xx>=0.3f ){ //这样做为了区分界面上面其它需要滑动的操作
ReleaseCapture();
SendMessage(Handle, 0xA1, 0x02, 0);
SendMessage(Handle, 0x0202, 0, 0);

}
if(bx)
xx +=Time.deltaTime;
if(Input.GetMouseButtonUp(0)){

xx =0f;
bx=false;

}

#endif
}

}