C++ SkEvent类代码示例

bool SkListView::onEvent(const SkEvent& evt)
{
	if (evt.isType(SK_EventType_Key))
	{
		switch (evt.getFast32()) {
		case kUp_SkKey:
			this->moveSelectionUp();
			return true;
		case kDown_SkKey:
			this->moveSelectionDown();
			return true;
		case kRight_SkKey:
		case kOK_SkKey:
			if (fSource && fCurrIndex >= 0)
			{
				SkEvent* evt = fSource->getEvent(fCurrIndex);
				if (evt)
				{
					SkView* view = this->sendEventToParents(*evt);
					delete evt;
					return view != NULL;
				}
				else	// hack to make toggle work
				{
					this->dirtyStrCache();
					this->inval(NULL);
				}
			}
			break;
		}
	}
	return this->INHERITED::onEvent(evt);
}

bool GMSampleView::onEvent(const SkEvent& evt) {
    if (evt.isType("GMSampleView::showSize")) {
        fShowSize = SkToBool(evt.getFast32());
        return true;
    }
    return this->INHERITED::onEvent(evt);
}

// The callback that is invoked by v8 whenever the JavaScript 'setTimeout'
// function is called.
//
// JS: setTimeout(on_timeout, 500);
void Global::SetTimeout(const v8::FunctionCallbackInfo<v8::Value>& args) {
    if (args.Length() != 2) {
        args.GetIsolate()->ThrowException(
                v8::String::NewFromUtf8(
                        args.GetIsolate(), "Error: 2 arguments required."));
        return;
    }

    // Pull out the first arg, make sure it's a function.
    if (!args[0]->IsFunction()) {
        printf("Not a function passed to setTimeout.\n");
        return;
    }
    Handle<Function> timeoutFn = Handle<Function>::Cast(args[0]);

    double delay = args[1]->NumberValue();
    int32_t id = gGlobal->getNextTimerID();

    gGlobal->fTimeouts[id].Reset(gGlobal->fIsolate, timeoutFn);

    // Create an SkEvent and add it with the right delay.
    SkEvent* evt = new SkEvent();
    evt->setTargetProc(Global::TimeOutProc);
    evt->setFast32(id);
    evt->postDelay(delay);

    args.GetReturnValue().Set(Integer::New(gGlobal->fIsolate, id));
}

void SkAnimateMaker::postOnEnd(SkAnimateBase* animate, SkMSec end) {
        SkEvent evt;
        evt.setS32("time", animate->getStart() + end);
        evt.setPtr("anim", animate);
        evt.setType(SK_EventType_OnEnd);
        SkEventSinkID sinkID = fAnimator->getSinkID();
        fAnimator->onEventPost(new SkEvent(evt), sinkID);
}

void SkGridView::onDraw(SkCanvas* canvas)
{
	this->INHERITED::onDraw(canvas);

	canvas->drawPaint(fPaint[kBG_Attr]);

	if (fSource == NULL)
		return;

#if 0
	int	visibleCount = SkMin32(fVisibleRowCount, fSource->countRows() - fScrollIndex);
	if (visibleCount == 0)
		return;

	this->ensureStrCache(visibleCount);
	int currIndex = this->logicalToVisualIndex(fCurrIndex);
#endif

	SkPaint	p;
	for (int i = 0; i < fSource->countRows(); i++)
	{
		bool	 forced = false;
		SkEvent* evt = fSource->getEvent(i);
		SkASSERT(evt);
		SkString path(evt->findString("path"));
		delete evt;

		SkBitmapRef* bmr = SkBitmapRef::Decode(path.c_str(), false);
		if (bmr == NULL)
		{
			bmr = SkBitmapRef::Decode(path.c_str(), true);
			if (bmr)
				forced = true;
		}

		if (bmr)
		{
			SkAutoTDelete<SkBitmapRef>	autoRef(bmr);
			SkRect	r;
			if (!this->getCellRect(i, &r))
				break;
			copybits(canvas, bmr->bitmap(), r, p);
		}
		// only draw one forced bitmap at a time
		if (forced)
		{
			this->inval(NULL);	// could inval only the remaining visible cells...
			break;
		}
	}

	// draw the hilite
	{
		SkRect	r;
		if (fCurrIndex >= 0 && this->getCellRect(fCurrIndex, &r))
			canvas->drawRect(r, fPaint[kHiliteCell_Attr]);
	}
}

bool SampleCode::KeyQ(const SkEvent& evt, SkKey* outKey) {
    if (evt.isType(gKeyEvtName, sizeof(gKeyEvtName) - 1)) {
        if (outKey) {
            *outKey = (SkKey)evt.getFast32();
        }
        return true;
    }
    return false;
}

int SkOSMenu::appendSlider(const char label[], const char slotName[],
                           SkEventSinkID target, SkScalar min, SkScalar max,
                           SkScalar defaultValue) {
    SkEvent* evt = new SkEvent(gMenuEventType, target);
    evt->setScalar(gSlider_Min_Scalar, min);
    evt->setScalar(gSlider_Max_Scalar, max);
    evt->setScalar(slotName, defaultValue);
    return appendItem(label, SkOSMenu::kSlider_Type, slotName, evt);
}

bool SampleCode::CharQ(const SkEvent& evt, SkUnichar* outUni) {
    if (evt.isType(gCharEvtName, sizeof(gCharEvtName) - 1)) {
        if (outUni) {
            *outUni = evt.getFast32();
        }
        return true;
    }
    return false;
}

bool SkOSMenu::FindText(const SkEvent& evt, const char slotName[], SkString* value) {
    if (evt.isType(gMenuEventType)) {
        const char* text = evt.findString(slotName);
        if (!text || !*text)
            return false;
        else {
            value->set(text);
            return true;
        }
    }
    return false;
}

void SkEventSink::postToListeners(const SkEvent& evt, SkMSec delay) {
    SkListenersTagList* list = (SkListenersTagList*)this->findTagList(kListeners_SkTagList);
    if (list) {
        SkASSERT(list->countListners() > 0);
        const SkEventSinkID* iter = list->fIDs;
        const SkEventSinkID* stop = iter + list->countListners();
        while (iter < stop) {
            SkEvent* copy = SkNEW_ARGS(SkEvent, (evt));
            copy->setTargetID(*iter++)->postDelay(delay);
        }
    }
}

SkEventSink::EventResult SkEventSink::DoEvent(const SkEvent& evt) {
    SkEvent::Proc proc = evt.getTargetProc();
    if (proc) {
        return proc(evt) ? kHandled_EventResult : kNotHandled_EventResult;
    }

    SkEventSink* sink = SkEventSink::FindSink(evt.getTargetID());
    if (sink) {
        return sink->doEvent(evt) ? kHandled_EventResult : kNotHandled_EventResult;
    }

    return kSinkNotFound_EventResult;
}

bool SkInfoPanelView::onEvent(const SkEvent& evt) {
    if (evt.isType(SkDebugger_StateType)) {
        fMatrix = evt.findString(SkDebugger_Matrix);
        fClip = evt.findString(SkDebugger_Clip);
        
        SkPaint* ptr;
        if (evt.getMetaData().findPtr(SkDebugger_Paint, (void**)&ptr)) {
            fPaint = *ptr;
            fPaintInfo = evt.findString(SkDebugger_PaintInfo);
        }
        this->inval(NULL);
        return true;
    }
    return this->INHERITED::onEvent(evt);
}

bool SampleWindow::onEvent(const SkEvent& evt) {
    if (evt.isType(ANIMATING_EVENTTYPE)) {
        if (fAnimating) {
            this->nextSample();
            this->postAnimatingEvent();
        }
        return true;
    }
    if (evt.isType("set-curr-index")) {
        fCurrIndex = evt.getFast32() % fSamples.count();
        this->loadView(fSamples[fCurrIndex]());
        return true;
    }
    return this->INHERITED::onEvent(evt);
}

 bool onEvent(const SkEvent& evt) override {
     if (evt.isType(INVAL_ALL_TYPE)) {
         this->inval(NULL);
         return true;
     }
     return this->INHERITED::onEvent(evt);
 }

	virtual SkEvent* getEvent(int index)
	{
		SkASSERT((unsigned)index < (unsigned)fCount);

		if (fList[index].fType == kDir_Type)
		{
			SkEvent* evt = new SkEvent();
			evt->setType(fList[index].fTarget);
			evt->setFast32(index);
			return evt;
		}
		if (fList[index].fType == kToggle_Type)
			fList[index].fTail.swap(fList[index].fAltTail);

		return NULL;
	}