Make handledestroy about to cancel.

CNFG.h

@@ -132,7 +132,7 @@ int CNFGHandleInput();
 void HandleKey( int keycode, int bDown );
 void HandleButton( int x, int y, int button, int bDown );
 void HandleMotion( int x, int y, int mask );
-void HandleDestroy();
+int HandleDestroy(); // Return nonzero if you want to cancel destroy.
 #ifdef ANDROID_WANT_WINDOW_TERMINATION
 void HandleWindowTermination();
 #endif

CNFGEGLDriver.c

@@ -473,8 +473,8 @@ void handle_cmd(struct android_app* app, int32_t cmd)
 	{
 	case APP_CMD_DESTROY:
 		//This gets called initially after back.
-		HandleDestroy();
-		ANativeActivity_finish( gapp->activity );
+		if( !HandleDestroy() )
+			ANativeActivity_finish( gapp->activity );
 		break;
 	case APP_CMD_INIT_WINDOW:
 		//When returning from a back button suspension, this isn't called.

CNFGWinDriver.c

@@ -137,8 +137,8 @@ LRESULT CALLBACK MyWndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 		break;
 #endif
 	case WM_DESTROY:
-		HandleDestroy();
-		CNFGTearDown();
+		if( !HandleDestroy() )
+			CNFGTearDown();
 		return 0;
 	}
 	return DefWindowProc(hwnd, msg, wParam, lParam);

README.md

@@ -101,7 +101,7 @@ is as follows:
 void HandleKey( int keycode, int bDown ) { }
 void HandleButton( int x, int y, int button, int bDown ) { }
 void HandleMotion( int x, int y, int mask ) { }
-void HandleDestroy() { }
+int HandleDestroy() { reutrn 0; }
 int main()
 {
 	CNFGSetup( "Example App", 1024, 768 );

examples/fontsize.c

@@ -30,10 +30,11 @@ void HandleMotion( int x, int y, int mask )
 //	printf( "Motion: %d,%d (%d)\n", x, y, mask );
 }
 
-void HandleDestroy()
+int HandleDestroy()
 {
 	printf( "Destroying\n" );
 	exit(10);
+	return 0;
 }
 
 int main()

ogltest.c

@@ -17,9 +17,10 @@ void HandleMotion( int x, int y, int mask )
 {
 }
 
-void HandleDestroy()
+int HandleDestroy()
 {
 	exit(10);
+	return 0;
 }
 
 int main()

osdtest.c

@@ -26,10 +26,11 @@ void HandleMotion( int x, int y, int mask )
 }
 
 
-void HandleDestroy()
+int HandleDestroy()
 {
 	printf( "Destroying\n" );
 	exit(10);
+	return 0;
 }
 
 

rawdraw.c

@@ -153,10 +153,11 @@ void DrawHeightmap()
 }
 
 
-void HandleDestroy()
+int HandleDestroy()
 {
 	printf( "Destroying\n" );
 	exit(10);
+	return 0;
 }
 
 uint32_t randomtexturedata[65536];

simple.c

@@ -9,7 +9,7 @@
 void HandleKey( int keycode, int bDown ) { }
 void HandleButton( int x, int y, int button, int bDown ) { }
 void HandleMotion( int x, int y, int mask ) { }
-void HandleDestroy() { }
+int HandleDestroy() { return 0; }
 int main()
 {
 	CNFGSetup( "Example App", 1024, 768 );