Unity：实现无边框窗口，四边阴影。

偏执的太偏执、 2024-04-20 12:21 78阅读 0赞

##### 1、集成Win函数,定义接口 #####

using UnityEngine;
    using System.Runtime.InteropServices;
    using System;
    
    //设置当前窗口的显示状态
    [DllImport("user32.dll")]
    public static extern bool ShowWindow(System.IntPtr hwnd, int nCmdShow);
    
    //获取当前激活窗口
    [DllImport("user32.dll", EntryPoint = "GetForegroundWindow")]
    public static extern System.IntPtr GetForegroundWindow();
    
    //设置窗口边框
    [DllImport("user32.dll")]
    public static extern IntPtr SetWindowLong(IntPtr hwnd, int _nIndex, int dwNewLong);
    
    //设置窗口位置，大小
    [DllImport("user32.dll")]
    public static extern bool SetWindowPos(IntPtr hWnd, int hWndAfter, int X, int Y, int cx, int cy, uint uFlags);
    
    public const int CS_DropSHADOW = 0x20000;
    public const int SPI_SETDROPSHADOW = 0x1025;
    public const int GCL_STYLE = -26;
    
     [DllImport("user32.dll", CharSet = CharSet.Auto)]
     public static extern int SetClassLong(IntPtr hwnd, int nIndex, int dwNewLong);
    
     [DllImport("user32.dll", CharSet = CharSet.Auto)]
     public static extern int GetClassLong(IntPtr hwnd, int nIndex);
    
     [DllImport("user32.dll", CharSet = CharSet.Auto)]
     public static extern int SystemParametersInfo(int uAction, int uParam, bool lpvParam, int fuWinIni);
    
    
     [DllImport("Gdi32.dll", EntryPoint = "CreateRoundRectRgn")]
     private static extern IntPtr CreateRoundRectRgn
     (
         int nLeftRect, // x-coordinate of upper-left corner
         int nTopRect, // y-coordinate of upper-left corner
         int nRightRect, // x-coordinate of lower-right corner
         int nBottomRect, // y-coordinate of lower-right corner
         int nWidthEllipse, // height of ellipse
         int nHeightEllipse // width of ellipse
      );
    
     [DllImport("dwmapi.dll")]
     public static extern int DwmExtendFrameIntoClientArea(IntPtr hWnd, ref MARGINS pMarInset);
    
     [DllImport("dwmapi.dll")]
     public static extern int DwmSetWindowAttribute(IntPtr hwnd, int attr, ref int attrValue, int attrSize);
    
     [DllImport("dwmapi.dll")]
     public static extern int DwmIsCompositionEnabled(ref int pfEnabled);
    
     private bool m_aeroEnabled;                     // variables for box shadow
     
     public struct MARGINS                           // struct for box shadow
     {
         public int leftWidth;
         public int rightWidth;
         public int topHeight;
         public int bottomHeight;
     }

##### 2、设置窗口无边框 #####

IntPtr hwnd = GetForegroundWindow() ;
    //计算窗口显示位置
    float windowWidth = 1024;
    float windowHeight = 768;
    float posX = (Screen.currentResolution.width - windowWidth) / 2;
    float posY = (Screen.currentResolution.height - windowHeight) / 2;
    Rect rect = new Rect(posX, posY, windowWidth, windowHeight);
    //设置窗口样式
    long wndStyle = 0;
    wndStyle |= WindowsMessage.WS_POPUP;
    wndStyle &= ~WindowsMessage.WS_CAPTION;
    SetWindowLong(hwnd , GWL_STYLE, WS_POPUP);
    SetWindowPos(hwnd , 0, (int)rect.x, (int)rect.y, (int)rect.width, (int)rect.height, SWP_SHOWWINDOW);

##### 3、调用系统函数，设置窗口阴影(只能设置右下阴影) #####

WindowsTools.SystemParametersInfo(WindowsTools.SPI_SETDROPSHADOW, 0, true, 0); // - 开启阴影效果
     WindowsTools.SetClassLong(hwnd , WindowsTools.GCL_STYLE,
          WindowsTools.GetClassLong(hwnd , WindowsTools.GCL_STYLE) | WindowsTools.CS_DropSHADOW);

##### 4、判断Window是否是处于Aero模式 #####

private bool CheckAeroEnabled()
    {
        if (Environment.OSVersion.Version.Major >= 6)
        {
            int enabled = 0;
            DwmIsCompositionEnabled(ref enabled);
            return (enabled == 1) ? true : false;
        }
        return false;
    }

##### 5、继承Win消息，添加四边阴影 #####

_aeroEnabled = CheckAeroEnabled()；
    protected override void WndProc(ref Message m)
    {
       switch (m.Msg)
       {
           case WM_NCPAINT:                    
               if (_aeroEnabled)
               {
                   var v = 2;
                   DwmSetWindowAttribute(this.Handle, 2, ref v, 4);
                   MARGINS margins = new MARGINS()
                   {
                       bottomHeight = 1,
                       leftWidth = 1,
                       rightWidth = 1,
                       topHeight = 1
                   };
                   DwmExtendFrameIntoClientArea(this.Handle, ref margins);
    
               }
               break;
           default:
               break;
       }
       base.WndProc(ref m);
    }