Unity 實現無邊框視窗，四邊陰影。

1、整合win函式,定義介面

using unityengine;

using system.runtime.interopservices;
using system;
//設定當前視窗的顯示狀態
[dllimport("user32.dll")]
public static extern bool showwindow(system.intptr hwnd, int ncmdshow);
//獲取當前啟用視窗
[dllimport("user32.dll", entrypoint = "getforegroundwindow")]
public static extern system.intptr getforegroundwindow();
//設定視窗邊框
[dllimport("user32.dll")]
public static extern intptr setwindowlong(intptr hwnd, int _nindex, int dwnewlong);
//設定視窗位置，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

intptr hwnd = getforegroundwindow() ;

//計算視窗顯示位置
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);
//設定視窗樣式
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);

windowstools.systemparametersinfo(windowstools.spi_setdropshadow, 0, true, 0); // - 開啟陰影效果

windowstools.setclasslong(hwnd , windowstools.gcl_style,
windowstools.getclasslong(hwnd , windowstools.gcl_style) | windowstools.cs_dropshadow);

private bool checkaeroenabled()

return false;
}

_aeroenabled = checkaeroenabled()；

protected override void wndproc(ref message m)
;               dwmextendframeintoclientarea(this.handle, ref margins);
}break;
default:
break;
}base.wndproc(ref m);
}

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