cocoa - 火狐 cocoa 插件

Question

我创建了简单的类似 hello world 的插件，它绘制了红色框。

嵌入 xulrunner 应用程序后，该插件几乎可以正常工作。 Xulrunner 应用程序在调整应用程序窗口大小时成功重绘了框。

但是在发生任何鼠标事件(例如左键单击)之后，我的应用程序会因“堆栈溢出”而崩溃。调试器表示原因是 2 次调用forwardMethod 后跟一次调用 JSD_GetValueForObject 的无限循环

崩溃后堆栈内容是下一个:

• -[NSApplication _indexOfWindow:]
• -[NSEvent 窗口]
• JSD_GetValueForObject
• JSD_GetValueForObject
• JSD_GetValueForObject
• forwardMethod
• forwardMethod
• JSD_GetValueForObject
• forwardMethod
• forwardMethod
• JSD_GetValueForObject
• forwardMethod
• forwardMethod
• JSD_GetValueForObject
• forwardMethod
• forwardMethod
• JSD_GetValueForObject
• forwardMethod
• forwardMethod
• JSD_GetValueForObject
• forwardMethod
• forwardMethod
• ......等等

我的代码是:

int16_t NPP_HandleEvent(NPP instance, void* event)
{
    EventRecord* carbonEvent = (EventRecord*)event;

    if (carbonEvent && (carbonEvent->what == updateEvt))
    {       
        PluginInstance* currentInstance = (PluginInstance*)(instance->pdata);
        CGContextRef cgContext = ((NP_CGContext*)(currentInstance->window.window))->context;
        float windowWidth = currentInstance->window.width;
        float windowHeight = currentInstance->window.height;

        static int x = 0;

        if (x++)
            return;

        NPRect clipRect = currentInstance->window.clipRect;

        NP_CGContext* npContext = currentInstance->window.window;

        NSWindow* browserWindow = [[[NSWindow alloc] initWithWindowRef:npContext->window] autorelease];

        int y = [browserWindow frame].size.height - (clipRect.bottom - clipRect.top) -  currentInstance->window.y;

        //[plugin attachToWindow:browserWindow at:NSMakePoint(window->x, y)];
        NSPoint point = NSMakePoint(currentInstance->window.x, y);

        // find the NSView at the point
        NSView* hitView = [[browserWindow contentView] hitTest:NSMakePoint(point.x+1, point.y+1)];
        if (hitView == nil || ![[hitView className] isEqualToString:@"ChildView"]) 
        {
            x = 0;
            return;
        }

        NSView* parentView = hitView;       

        NSBox *box = [[NSBox alloc] initWithFrame:NSMakeRect(0.0, 0.0, 100, 100)];
        [box setBoxType:NSBoxCustom];
        [box setBorderType:NSLineBorder];
        [box setTitlePosition:NSNoTitle];
        [box setFillColor:[NSColor redColor]];

        [parentView addSubview:box];

        //DrawPlugin(cgContext, windowWidth, windowHeight);
    }

    return 0;
}

Answer 1

非常感谢你，Winz!

我刚刚从

下载了最新的 mozilla 版本和 SDK

http://ftp.mozilla.org/pub/mozilla.org/xulrunner/nightly/latest-trunk/

以及来自

的 BasicPlugin.xcodeproj

http://mxr.mozilla.org/mozilla-central/source/modules/plugin/sdk/samples/basic/mac/

现在可以访问 Cocoa 事件模型。