Java example source code file (LWCToolkit.m)

This example Java source code file (LWCToolkit.m) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

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Java - Java tags/keywords

awtrunloopobject, awttoolkit, bool, jnf_class_cache, jnf_cocoa_enter, jnf_cocoa_exit, jnfisinstanceof, jnfrunloop, jni_false, jnicall, jnienv, jniexport, threadutilities, uint32

The LWCToolkit.m Java example source code

/*
 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

#import <dlfcn.h>
#import <JavaNativeFoundation/JavaNativeFoundation.h>

#include "jni_util.h"
#import "CMenuBar.h"
#import "InitIDs.h"
#import "LWCToolkit.h"
#import "ThreadUtilities.h"
#import "AWT_debug.h"
#import "CSystemColors.h"
#import  "NSApplicationAWT.h"

#import "sun_lwawt_macosx_LWCToolkit.h"

#import "sizecalc.h"

int gNumberOfButtons;
jint* gButtonDownMasks;

@implementation AWTToolkit

static long eventCount;

+ (long) getEventCount{
    return eventCount;
}

+ (void) eventCountPlusPlus{    
    eventCount++;
}

@end


@interface AWTRunLoopObject : NSObject {
    BOOL _shouldEndRunLoop;
}
@end

@implementation AWTRunLoopObject

- (id) init {
    self = [super init];
    if (self != nil) {
        _shouldEndRunLoop = NO;
    }
    return self;
}

- (BOOL) shouldEndRunLoop {
    return _shouldEndRunLoop;
}

- (void) endRunLoop {
    _shouldEndRunLoop = YES;
}

@end

/*
 * Class:     sun_lwawt_macosx_LWCToolkit
 * Method:    nativeSyncQueue
 * Signature: (J)Z
 */
JNIEXPORT jboolean JNICALL Java_sun_lwawt_macosx_LWCToolkit_nativeSyncQueue
(JNIEnv *env, jobject self, jlong timeout)
{
    int currentEventNum = [AWTToolkit getEventCount];

    NSApplication* sharedApp = [NSApplication sharedApplication];
    if ([sharedApp isKindOfClass:[NSApplicationAWT class]]) {
        NSApplicationAWT* theApp = (NSApplicationAWT*)sharedApp;
        [theApp postDummyEvent];
        [theApp waitForDummyEvent];
    } else {
        // could happen if we are embedded inside SWT application,
        // in this case just spin a single empty block through 
        // the event loop to give it a chance to process pending events
        [JNFRunLoop performOnMainThreadWaiting:YES withBlock:^(){}];
    }
    
    if (([AWTToolkit getEventCount] - currentEventNum) != 0) {
        return JNI_TRUE;
    }
        
    return JNI_FALSE;
}


static JNF_CLASS_CACHE(jc_Component, "java/awt/Component");
static JNF_MEMBER_CACHE(jf_Component_appContext, jc_Component, "appContext", "Lsun/awt/AppContext;");
static JNF_CLASS_CACHE(jc_MenuComponent, "java/awt/MenuComponent");
static JNF_MEMBER_CACHE(jf_MenuComponent_appContext, jc_MenuComponent, "appContext", "Lsun/awt/AppContext;");

/*
 * Class:     sun_awt_SunToolkit
 * Method:    getAppContext
 * Signature: (Ljava/awt/Object;)Lsun/awt/AppContext;
 */
JNIEXPORT jobject JNICALL
Java_sun_awt_SunToolkit_getAppContext
(JNIEnv *env, jclass cls, jobject obj)
{
    jobject appContext = NULL;

JNF_COCOA_ENTER(env);

    if (JNFIsInstanceOf(env, obj, &jc_Component)) {
        appContext = JNFGetObjectField(env, obj, jf_Component_appContext);
    } else if (JNFIsInstanceOf(env, obj, &jc_MenuComponent)) {
        appContext = JNFGetObjectField(env, obj, jf_MenuComponent_appContext);
    }

JNF_COCOA_EXIT(env);

    return appContext;
}

/*
 * Class:     sun_awt_SunToolkit
 * Method:    setAppContext
 * Signature: (Ljava/lang/Object;Lsun/awt/AppContext;)Z
 */
JNIEXPORT jboolean JNICALL
Java_sun_awt_SunToolkit_setAppContext
(JNIEnv *env, jclass cls, jobject obj, jobject appContext)
{
    jboolean isComponent;

JNF_COCOA_ENTER(env);

    if (JNFIsInstanceOf(env, obj, &jc_Component)) {
        JNFSetObjectField(env, obj, jf_Component_appContext, appContext);
        isComponent = JNI_TRUE;
    } else if (JNFIsInstanceOf(env, obj, &jc_MenuComponent)) {
        JNFSetObjectField(env, obj, jf_MenuComponent_appContext, appContext);
        isComponent = JNI_FALSE;
    }

JNF_COCOA_EXIT(env);

    return isComponent;
}

/*
 * Class:     sun_lwawt_macosx_LWCToolkit
 * Method:    beep
 * Signature: ()V
 */
JNIEXPORT void JNICALL
Java_sun_lwawt_macosx_LWCToolkit_beep
(JNIEnv *env, jobject self)
{
    NSBeep(); // produces both sound and visual flash, if configured in System Preferences
}

/*
 * Class:     sun_lwawt_macosx_LWCToolkit
 * Method:    initIDs
 * Signature: ()V
 */
JNIEXPORT void JNICALL
Java_sun_lwawt_macosx_LWCToolkit_initIDs
(JNIEnv *env, jclass klass) {
    // set thread names
    dispatch_async(dispatch_get_main_queue(), ^(void){
        [[NSThread currentThread] setName:@"AppKit Thread"];

        JNIEnv *env = [ThreadUtilities getJNIEnv];
        static JNF_CLASS_CACHE(jc_LWCToolkit, "sun/lwawt/macosx/LWCToolkit");
        static JNF_STATIC_MEMBER_CACHE(jsm_installToolkitThreadNameInJava, jc_LWCToolkit, "installToolkitThreadNameInJava", "()V");
        JNFCallStaticVoidMethod(env, jsm_installToolkitThreadNameInJava);
    });

    gNumberOfButtons = sun_lwawt_macosx_LWCToolkit_BUTTONS;

    jclass inputEventClazz = (*env)->FindClass(env, "java/awt/event/InputEvent");
    jmethodID getButtonDownMasksID = (*env)->GetStaticMethodID(env, inputEventClazz, "getButtonDownMasks", "()[I");
    jintArray obj = (jintArray)(*env)->CallStaticObjectMethod(env, inputEventClazz, getButtonDownMasksID);
    jint * tmp = (*env)->GetIntArrayElements(env, obj, JNI_FALSE);

    gButtonDownMasks = (jint*)SAFE_SIZE_ARRAY_ALLOC(malloc, sizeof(jint), gNumberOfButtons);
    if (gButtonDownMasks == NULL) {
        gNumberOfButtons = 0;
        JNU_ThrowOutOfMemoryError(env, NULL);
        return;
    }

    int i;
    for (i = 0; i < gNumberOfButtons; i++) {
        gButtonDownMasks[i] = tmp[i];
    }

    (*env)->ReleaseIntArrayElements(env, obj, tmp, 0);
    (*env)->DeleteLocalRef(env, obj);
}

static UInt32 RGB(NSColor *c) {
    c = [c colorUsingColorSpaceName:NSCalibratedRGBColorSpace];
    if (c == nil)
    {
        return -1; // opaque white
    }

    CGFloat r, g, b, a;
    [c getRed:&r green:&g blue:&b alpha:&a];

    UInt32 ir = (UInt32) (r*255+0.5),
    ig = (UInt32) (g*255+0.5),
    ib = (UInt32) (b*255+0.5),
    ia = (UInt32) (a*255+0.5);

    //    NSLog(@"%@ %d, %d, %d", c, ir, ig, ib);

    return ((ia & 0xFF) << 24) | ((ir & 0xFF) << 16) | ((ig & 0xFF) << 8) | ((ib & 0xFF) << 0);
}

void doLoadNativeColors(JNIEnv *env, jintArray jColors, BOOL useAppleColors) {
    jint len = (*env)->GetArrayLength(env, jColors);

    UInt32 colorsArray[len];
    UInt32 *colors = colorsArray;

    [JNFRunLoop performOnMainThreadWaiting:YES withBlock:^(){
        NSUInteger i;
        for (i = 0; i < len; i++) {
            colors[i] = RGB([CSystemColors getColor:i useAppleColor:useAppleColors]);
        }
    }];

    jint *_colors = (*env)->GetPrimitiveArrayCritical(env, jColors, 0);
    memcpy(_colors, colors, len * sizeof(UInt32));
    (*env)->ReleasePrimitiveArrayCritical(env, jColors, _colors, 0);
}

/**
 * Class:     sun_lwawt_macosx_LWCToolkit
 * Method:    loadNativeColors
 * Signature: ([I[I)V
 */
JNIEXPORT void JNICALL Java_sun_lwawt_macosx_LWCToolkit_loadNativeColors
(JNIEnv *env, jobject peer, jintArray jSystemColors, jintArray jAppleColors)
{
JNF_COCOA_ENTER(env);
    doLoadNativeColors(env, jSystemColors, NO);
    doLoadNativeColors(env, jAppleColors, YES);
JNF_COCOA_EXIT(env);
}

/*
 * Class:     sun_lwawt_macosx_LWCToolkit
 * Method:    createAWTRunLoopMediator
 * Signature: ()J
 */
JNIEXPORT jlong JNICALL Java_sun_lwawt_macosx_LWCToolkit_createAWTRunLoopMediator
(JNIEnv *env, jclass clz)
{
AWT_ASSERT_APPKIT_THREAD;

    AWTRunLoopObject *o = nil;

    // We double retain because this object is owned by both main thread and "other" thread
    // We release in both doAWTRunLoop and stopAWTRunLoop
    o = [[AWTRunLoopObject alloc] init];
    if (o) {
        CFRetain(o); // GC
        CFRetain(o); // GC
        [o release];
    }
    return ptr_to_jlong(o);
}

/*
 * Class:     sun_lwawt_macosx_LWCToolkit
 * Method:    doAWTRunLoopImpl
 * Signature: (JZZ)V
 */
JNIEXPORT void JNICALL Java_sun_lwawt_macosx_LWCToolkit_doAWTRunLoopImpl
(JNIEnv *env, jclass clz, jlong mediator, jboolean processEvents, jboolean inAWT)
{
AWT_ASSERT_APPKIT_THREAD;
JNF_COCOA_ENTER(env);

    AWTRunLoopObject* mediatorObject = (AWTRunLoopObject*)jlong_to_ptr(mediator);

    if (mediatorObject == nil) return;

    // Don't use acceptInputForMode because that doesn't setup autorelease pools properly
    BOOL isRunning = true;
    while (![mediatorObject shouldEndRunLoop] && isRunning) {
        isRunning = [[NSRunLoop currentRunLoop] runMode:(inAWT ? [JNFRunLoop javaRunLoopMode] : NSDefaultRunLoopMode)
                                             beforeDate:[NSDate dateWithTimeIntervalSinceNow:0.010]];
        if (processEvents) {
            //We do not spin a runloop here as date is nil, so does not matter which mode to use
            NSEvent *event;
            if ((event = [NSApp nextEventMatchingMask:NSAnyEventMask
                                           untilDate:nil
                                              inMode:NSDefaultRunLoopMode
                                             dequeue:YES]) != nil) {
                [NSApp sendEvent:event];
            }

        }
    }

   
    CFRelease(mediatorObject);

JNF_COCOA_EXIT(env);
}

/*
 * Class:     sun_lwawt_macosx_LWCToolkit
 * Method:    stopAWTRunLoop
 * Signature: (J)V
 */
JNIEXPORT void JNICALL Java_sun_lwawt_macosx_LWCToolkit_stopAWTRunLoop
(JNIEnv *env, jclass clz, jlong mediator)
{
JNF_COCOA_ENTER(env);

    AWTRunLoopObject* mediatorObject = (AWTRunLoopObject*)jlong_to_ptr(mediator);

    [ThreadUtilities performOnMainThread:@selector(endRunLoop) on:mediatorObject withObject:nil waitUntilDone:NO];

    CFRelease(mediatorObject);

JNF_COCOA_EXIT(env);
}

/*
 * Class:     sun_lwawt_macosx_LWCToolkit
 * Method:    isCapsLockOn
 * Signature: ()Z
 */
JNIEXPORT jboolean JNICALL Java_sun_lwawt_macosx_LWCToolkit_isCapsLockOn
(JNIEnv *env, jobject self)
{
    __block jboolean isOn = JNI_FALSE;
    [JNFRunLoop performOnMainThreadWaiting:YES withBlock:^(){
        NSUInteger modifiers = [NSEvent modifierFlags];
        isOn = (modifiers & NSAlphaShiftKeyMask) != 0;
    }];

    return isOn;
}

/*
 * Class:     sun_lwawt_macosx_LWCToolkit
 * Method:    isApplicationActive
 * Signature: ()Z
 */
JNIEXPORT jboolean JNICALL Java_sun_lwawt_macosx_LWCToolkit_isApplicationActive
(JNIEnv *env, jclass clazz)
{
    __block jboolean active = JNI_FALSE;

JNF_COCOA_ENTER(env);

    [ThreadUtilities performOnMainThreadWaiting:YES block:^() {
        active = (jboolean)[NSRunningApplication currentApplication].active;
    }];

JNF_COCOA_EXIT(env);

    return active;
}


/*
 * Class:     sun_awt_SunToolkit
 * Method:    closeSplashScreen
 * Signature: ()V
 */
JNIEXPORT void JNICALL
Java_sun_awt_SunToolkit_closeSplashScreen(JNIEnv *env, jclass cls)
{
    void *hSplashLib = dlopen(0, RTLD_LAZY);
    if (!hSplashLib) return;

    void (*splashClose)() = dlsym(hSplashLib, "SplashClose");
    if (splashClose) {
        splashClose();
    }
    dlclose(hSplashLib);
}


// TODO: definitely doesn't belong here (copied from fontpath.c in the
// solaris tree)...

JNIEXPORT jstring JNICALL
Java_sun_font_FontManager_getFontPath
(JNIEnv *env, jclass obj, jboolean noType1)
{
    return JNFNSToJavaString(env, @"/Library/Fonts");
}

// This isn't yet used on unix, the implementation is added since shared
// code calls this method in preparation for future use.
JNIEXPORT void JNICALL
Java_sun_font_FontManager_populateFontFileNameMap
(JNIEnv *env, jclass obj, jobject fontToFileMap, jobject fontToFamilyMap, jobject familyToFontListMap, jobject locale)
{

}