Examples/NetscapeMuteAPIPlugin/main.m

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#import "AudioPlayer.h"
#import "MenuHandler.h"
#import <Cocoa/Cocoa.h>
#import <WebKit/npapi.h>
#import <WebKit/npfunctions.h>
#import <WebKit/npruntime.h>

// Browser function table
static NPNetscapeFuncs* browser;

// Structure for per-instance storage
@interface PluginObject : NSObject <AudioPlayerDelegate> {
    AudioPlayer *_audioPlayer;
    MenuHandler *_menuHandler;
}

@property (nonatomic, readonly) NPP npp;
@property (nonatomic) NPWindow window;
@property (nonatomic, strong, readonly) NSURL *audioURL;
@property (nonatomic, copy, readonly) NSString *displayString;
@property (nonatomic, strong, readonly) MenuHandler *menuHandler;
@property (nonatomic) BOOL hasFocus;
@property (nonatomic, readonly, getter=isPlayingAudio) BOOL playingAudio;
@property (nonatomic, getter=isMuted) BOOL muted;

- (instancetype)initWithNPP:(NPP)npp audioURL:(NSURL *)audioURL;

@end

NPError NPP_New(NPMIMEType pluginType, NPP instance, uint16_t mode, int16_t argc, char* argn[], char* argv[], NPSavedData*);
NPError NPP_Destroy(NPP instance, NPSavedData**);
NPError NPP_SetWindow(NPP instance, NPWindow*);
NPError NPP_NewStream(NPP instance, NPMIMEType, NPStream*, NPBool seekable, uint16_t* stype);
NPError NPP_DestroyStream(NPP instance, NPStream*, NPReason);
int32_t NPP_WriteReady(NPP instance, NPStream*);
int32_t NPP_Write(NPP instance, NPStream*, int32_t offset, int32_t len, void* buffer);
void NPP_StreamAsFile(NPP instance, NPStream*, const char* fname);
void NPP_Print(NPP instance, NPPrint* platformPrint);
int16_t NPP_HandleEvent(NPP instance, void* event);
void NPP_URLNotify(NPP instance, const char* URL, NPReason, void* notifyData);
NPError NPP_GetValue(NPP instance, NPPVariable, void *value);
NPError NPP_SetValue(NPP instance, NPNVariable, void *value);

#pragma export on
// Mach-o entry points
NPError NP_Initialize(NPNetscapeFuncs *browserFuncs);
NPError NP_GetEntryPoints(NPPluginFuncs *);
void NP_Shutdown(void);
#pragma export off

static void invalidatePlugin(PluginObject *);

@implementation PluginObject

- (instancetype)initWithNPP:(NPP)npp audioURL:(NSURL *)audioURL
{
    if (!(self = [super init]))
        return nil;

    _npp = npp;
    _audioURL = [audioURL retain];
    _audioPlayer = [[AudioPlayer alloc] initWithURL:audioURL];
    _audioPlayer.audioPlayerDelegate = self;

    NPBool isMuted;
    if (browser->getvalue(npp, NPNVmuteAudioBool, &isMuted) != NPERR_NO_ERROR)
        isMuted = FALSE;
    self.muted = isMuted;

    [self _invalidateDisplayString];

    return self;
}

- (void)dealloc
{
    [_audioURL release];
    [_menuHandler release];
    [_audioPlayer release];
    [_displayString release];

    [super dealloc];
}

- (MenuHandler *)menuHandler
{
    if (!_menuHandler)
        _menuHandler = [[MenuHandler alloc] initWithAudioPlayer:_audioPlayer];

    return _menuHandler;
}

- (BOOL)isPlayingAudio
{
    return _audioPlayer.isPlaying;
}

- (BOOL)isMuted
{
    return _audioPlayer.isMuted;
}

- (void)setMuted:(BOOL)muted
{
    _audioPlayer.muted = muted;
}

- (void)readyStateDidChangeForAudioPlayer:(AudioPlayer *)audioPlayer
{
    [self _invalidateDisplayString];
    invalidatePlugin(self);
}

- (void)mutedStateDidChangeForAudioPlayer:(AudioPlayer *)audioPlayer
{
}

- (void)playStateDidChangeForAudioPlayer:(AudioPlayer *)audioPlayer
{
    [self _invalidateDisplayString];
    invalidatePlugin(self);
    browser->setvalue(_npp, NPPVpluginIsPlayingAudio, _audioPlayer.isPlaying);
}

- (void)_invalidateDisplayString
{
    [_displayString release];

    NSString *prefix;
    if (!_audioPlayer.isReadyToPlay)
        prefix = @"Loading: ";
    else if (_audioPlayer.isPlaying)
        prefix = @"Playing: ";
    else
        prefix = @"Ready to play: ";

    _displayString = [[NSString stringWithFormat:@"%@ %@", prefix, _audioURL.absoluteString] retain];
}

@end


NPError NP_Initialize(NPNetscapeFuncs* browserFuncs)
{
    browser = browserFuncs;
    return NPERR_NO_ERROR;
}

NPError NP_GetEntryPoints(NPPluginFuncs* pluginFuncs)
{
    pluginFuncs->version = 11;
    pluginFuncs->size = sizeof(pluginFuncs);
    pluginFuncs->newp = NPP_New;
    pluginFuncs->destroy = NPP_Destroy;
    pluginFuncs->setwindow = NPP_SetWindow;
    pluginFuncs->newstream = NPP_NewStream;
    pluginFuncs->destroystream = NPP_DestroyStream;
    pluginFuncs->asfile = NPP_StreamAsFile;
    pluginFuncs->writeready = NPP_WriteReady;
    pluginFuncs->write = (NPP_WriteProcPtr)NPP_Write;
    pluginFuncs->print = NPP_Print;
    pluginFuncs->event = NPP_HandleEvent;
    pluginFuncs->urlnotify = NPP_URLNotify;
    pluginFuncs->getvalue = NPP_GetValue;
    pluginFuncs->setvalue = NPP_SetValue;
    
    return NPERR_NO_ERROR;
}

void NP_Shutdown(void)
{

}

NPError NPP_New(NPMIMEType pluginType, NPP instance, uint16_t mode, int16_t argc, char* argn[], char* argv[], NPSavedData* saved)
{
    // Create per-instance storage
    // Ask the browser if it supports the CoreGraphics drawing model
    NPBool supportsCoreGraphics;
    if (browser->getvalue(instance, NPNVsupportsCoreGraphicsBool, &supportsCoreGraphics) != NPERR_NO_ERROR)
        supportsCoreGraphics = FALSE;
    
    if (!supportsCoreGraphics)
        return NPERR_INCOMPATIBLE_VERSION_ERROR;
    
    // If the browser supports the CoreGraphics drawing model, enable it.
    browser->setvalue(instance, NPPVpluginDrawingModel, (void *)NPDrawingModelCoreGraphics);

    // If the browser supports the Cocoa event model, enable it.
    NPBool supportsCocoa;
    if (browser->getvalue(instance, NPNVsupportsCocoaBool, &supportsCocoa) != NPERR_NO_ERROR)
        supportsCocoa = FALSE;
    
    if (!supportsCocoa)
        return NPERR_INCOMPATIBLE_VERSION_ERROR;
    
    browser->setvalue(instance, NPPVpluginEventModel, (void *)NPEventModelCocoa);

    NSURL *audioURL = nil;
    for (int16_t i = 0; i < argc; i++) {
        if (!strcasecmp(argn[i], "audiourl")) {
            NSString *urlString = [NSString stringWithUTF8String:argv[i]];
            if (urlString)
                audioURL = [NSURL URLWithString:urlString];
            break;
        }
    }

    PluginObject *obj = [[PluginObject alloc] initWithNPP:instance audioURL:audioURL];
    instance->pdata = obj;

    return NPERR_NO_ERROR;
}

NPError NPP_Destroy(NPP instance, NPSavedData** save)
{
    // Free per-instance storage
    PluginObject *obj = instance->pdata;
    [obj release];

    return NPERR_NO_ERROR;
}

NPError NPP_SetWindow(NPP instance, NPWindow* window)
{
    PluginObject *obj = instance->pdata;
    obj.window = *window;

    return NPERR_NO_ERROR;
}

NPError NPP_NewStream(NPP instance, NPMIMEType type, NPStream* stream, NPBool seekable, uint16_t* stype)
{
    *stype = NP_ASFILEONLY;
    return NPERR_NO_ERROR;
}

NPError NPP_DestroyStream(NPP instance, NPStream* stream, NPReason reason)
{
    return NPERR_NO_ERROR;
}

int32_t NPP_WriteReady(NPP instance, NPStream* stream)
{
    return 0;
}

int32_t NPP_Write(NPP instance, NPStream* stream, int32_t offset, int32_t len, void* buffer)
{
    return 0;
}

void NPP_StreamAsFile(NPP instance, NPStream* stream, const char* fname)
{
}

void NPP_Print(NPP instance, NPPrint* platformPrint)
{
}

static void handleDraw(PluginObject *obj, NPCocoaEvent *event)
{
    NSGraphicsContext *oldContext = [[NSGraphicsContext currentContext] retain];
    
    NSGraphicsContext *context = [NSGraphicsContext graphicsContextWithGraphicsPort:event->data.draw.context flipped:YES];

    [NSGraphicsContext setCurrentContext:context];
    
    NSRect rect = NSMakeRect(0, 0, obj.window.width, obj.window.height);
    
    [[NSColor lightGrayColor] set];
    [NSBezierPath fillRect:rect];

    // If the plugin has focus, draw a focus indicator
    if (obj.hasFocus) {
        [[NSColor blackColor] set];
        NSBezierPath *path = [NSBezierPath bezierPathWithRect:rect];
        [path setLineWidth:5];
        [path stroke];
    }
    
    [obj.displayString drawAtPoint:NSMakePoint(10, 10) withAttributes:nil];
    
    [NSGraphicsContext setCurrentContext:oldContext];
    [oldContext release];
}

static void invalidatePlugin(PluginObject *obj)
{
    NPRect rect;
    rect.left = 0;
    rect.top = 0;
    rect.right = obj.window.width;
    rect.bottom = obj.window.height;
    
    browser->invalidaterect(obj.npp, &rect);
}


static void handleMouseEvent(PluginObject *obj, NPCocoaEvent *event)
{
    if (event->data.mouse.buttonNumber == 1)
        browser->popupcontextmenu(obj.npp, (NPNSMenu *)[obj.menuHandler menu]);
}

int16_t NPP_HandleEvent(NPP instance, void* event)
{
    PluginObject *obj = instance->pdata;

    NPCocoaEvent *cocoaEvent = event;
    
    switch (cocoaEvent->type) {
    case NPCocoaEventFocusChanged:
        obj.hasFocus = cocoaEvent->data.focus.hasFocus;
        invalidatePlugin(obj);
        return 1;
        
    case NPCocoaEventDrawRect:
        handleDraw(obj, cocoaEvent);
        return 1;
    
    case NPCocoaEventMouseDown:
    case NPCocoaEventMouseUp:
        
    // FIXME: NPCocoaEventMouseMoved is currently disabled in order to see other events more clearly
    // without "drowning" in mouse moved events.
//        case NPCocoaEventMouseMoved:
    case NPCocoaEventMouseEntered:
    case NPCocoaEventMouseExited:
    case NPCocoaEventMouseDragged:
    case NPCocoaEventScrollWheel:
        handleMouseEvent(obj, cocoaEvent);
        return 1;

    default:
        break;
    }
    
    return 0;
}

void NPP_URLNotify(NPP instance, const char* url, NPReason reason, void* notifyData)
{

}

NPError NPP_GetValue(NPP instance, NPPVariable variable, void *value)
{
    PluginObject *obj = instance->pdata;

    switch (variable) {
    case NPPVpluginIsPlayingAudio:
        if (value)
            *((NPBool **)value) = obj.isPlayingAudio;
        return NPERR_NO_ERROR;

    default:
        return NPERR_GENERIC_ERROR;
    }
}

NPError NPP_SetValue(NPP instance, NPNVariable variable, void *value)
{
    PluginObject *obj = instance->pdata;

    switch (variable) {
    case NPNVmuteAudioBool:
        if (value)
            obj.muted = *((NPBool *)value);
        return NPERR_NO_ERROR;

    default:
        return NPERR_GENERIC_ERROR;
    }
}