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  Fix for JFrame and Alt menu on Win32  (Read 1324 times)
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Offline JvlShz

Junior Newbie





« Posted 2010-08-04 12:11:21 »

This code allows Java JFrames to behave like the LWJGL window, ie, no system menu when you click the icon.

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/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class library_NativeRoutines */

#ifndef _Included_library_NativeRoutines
#define _Included_library_NativeRoutines
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     library_NativeRoutines
 * Method:    hookWindowProcess
 * Signature: (Ljavax/swing/JFrame;)I
 */

JNIEXPORT jint JNICALL Java_library_NativeRoutines_hookWindowProcess
  (JNIEnv *, jclass, jobject);

#ifdef __cplusplus
}
#endif
#endif


C++ source:

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#include "Library.h"
#include <Windows.h>
#include <jawt_md.h>
#include <jawt.h>
#include <map>

std::map<HWND, WNDPROC> processMap;

LRESULT WINAPI CALLBACK HookedWndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
   if (uMsg == 0x0112 && wParam == 0xF093) {
      return 0;
   }
   if (uMsg == 0x0112 && wParam == 0xF063) {
      return 0;
   }
   if (uMsg == 0x00A5 || uMsg == 0x00A4) {
      return 0;
   }
   std::map<HWND, WNDPROC>::iterator mWndProc = processMap.find(hWnd);
   if (mWndProc == processMap.end()) {
      return 0; // Cannot process
  }
   return CallWindowProc(mWndProc->second, hWnd, uMsg, wParam, lParam);
}

JNIEXPORT jint JNICALL Java_library_NativeRoutines_hookWindowProcess
  (JNIEnv *env, jclass klass, jobject jframe) {
    typedef jboolean (JNICALL *PJAWT_GETAWT)(JNIEnv*, JAWT*);
    JAWT awt;
    JAWT_DrawingSurface* ds;
    JAWT_DrawingSurfaceInfo* dsi;
    JAWT_Win32DrawingSurfaceInfo* dsi_win;
    jboolean result;
    jint lock;
    HWND hWnd = 0;
 
    HMODULE hAWT = GetModuleHandle(L"jawt.dll");
    if (!hAWT)
       hAWT = LoadLibrary(L"jawt.dll");
    if (hAWT) {
        PJAWT_GETAWT JAWT_GetAWT = (PJAWT_GETAWT) GetProcAddress(hAWT, "_JAWT_GetAWT@8");
        if (JAWT_GetAWT) {
            awt.version = JAWT_VERSION_1_3;
            result = JAWT_GetAWT(env, &awt);
            if (result != JNI_FALSE) {
                ds = awt.GetDrawingSurface(env, jframe);
                if (ds != NULL) {
                    lock = ds->Lock(ds);
                    if((lock & JAWT_LOCK_ERROR) == 0) {
                        dsi = ds->GetDrawingSurfaceInfo(ds);
                        dsi_win = (JAWT_Win32DrawingSurfaceInfo*)dsi->platformInfo;
                        hWnd = dsi_win->hwnd;
                        ds->FreeDrawingSurfaceInfo(dsi);
                        ds->Unlock(ds);
               } else {
                  return 5;
               }
            } else {
               return 4;
            }
                awt.FreeDrawingSurface(ds);
         } else {
            return 3;
         }
      } else {
         return 2;
      }
   } else {
      return 1;
   }
   LONG oldWndProc = GetWindowLong(hWnd, GWL_WNDPROC);
   if (!oldWndProc) {
      return 6;
   }
   processMap[hWnd] = (WNDPROC) oldWndProc;
   if (!SetWindowLong(hWnd, GWL_WNDPROC, (LONG) HookedWndProc)) {
      return 7;
   }
   return 0;
}


Java source:

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/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */


package library;

import javax.swing.JFrame;

public class NativeRoutines {

   private static native int hookWindowProcess(JFrame jf);

   public static boolean hookWndProc(JFrame jf) {
      try {
         int result = hookWindowProcess(jf);
         return result == 0;
      } catch (Throwable err) {
         err.printStackTrace();
         return false;
      }
   }
}


How to disable the system menu and double icon click that closes the window:

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try {
 System.loadLibrary("jawt");
 System.loadLibrary("Library");
 library.NativeRoutines.hookWndProc(yourJFrame);
} catch (UnsatisfiedLinkError ex) {
 // handle
}


Hope this helps some of you out there.
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