C++ Vector::at方法代码示例

void GLExtras::drawFindOnPage(SkRect& viewport)
{
    WTF::Vector<MatchInfo>* matches = m_findOnPage->matches();
    XLOG("drawFindOnPage, matches: %p", matches);
    if (!matches || !m_findOnPage->isCurrentLocationValid())
        return;
    int count = matches->size();
    int current = m_findOnPage->currentMatchIndex();
    XLOG("match count: %d", count);
    if (count < MAX_NUMBER_OF_MATCHES_TO_DRAW)
        for (int i = 0; i < count; i++) {
            MatchInfo& info = matches->at(i);
            const SkRegion& region = info.getLocation();
            SkIRect rect = region.getBounds();
            if (rect.intersect(viewport.fLeft, viewport.fTop,
                               viewport.fRight, viewport.fBottom))
                drawRegion(region, i == current, false, true);
#ifdef DEBUG
            else
                XLOG("Quick rejecting [%dx%d, %d, %d", rect.fLeft, rect.fTop,
                     rect.width(), rect.height());
#endif // DEBUG
        }
    else {
        MatchInfo& info = matches->at(current);
        drawRegion(info.getLocation(), true, false, true);
    }
}

void MaskNode::OnSelfOrChildStateChange() {
	m_bChildNeedDraw = true;
	m_bBoundingDirty = true; // 不需要调用SetBoundingDirty()，因为不需要通知父节点

	WTF::Vector<UINode*>* owners = m_pManager->GetEffectsResOwnerNodes(this);
	if (!owners)
		return;

	// 子节点绘图消息被转发到拥有者节点上
	for (size_t i = 0; i < owners->size(); ++i)
		owners->at(i)->SetNeedLayout();
}

static void WebHistoryClose(JNIEnv* env, jobject obj, jint frame)
{
    LOG_ASSERT(frame, "Close needs a valid Frame pointer!");
    WebCore::Frame* pFrame = (WebCore::Frame*)frame;

    WebCore::BackForwardList* list = pFrame->page()->backForwardList();
    RefPtr<WebCore::HistoryItem> current = list->currentItem();
    // Remove each item instead of using close(). close() is intended to be used
    // right before the list is deleted.
    WebCore::HistoryItemVector& entries = list->entries();
    int size = entries.size();
    for (int i = size - 1; i >= 0; --i)
        list->removeItem(entries[i].get());
    // Add the current item back to the list.
    if (current) {
        current->setBridge(0);
        // addItem will update the children to match the newly created bridge
        list->addItem(current);

        /*
         * The Grand Prix site uses anchor navigations to change the display.
         * WebKit tries to be smart and not load child frames that have the
         * same history urls during an anchor navigation. This means that the
         * current history item stored in the child frame's loader does not
         * match the item found in the history tree. If we remove all the
         * entries in the back/foward list, we have to restore the entire tree
         * or else a HistoryItem might have a deleted parent.
         *
         * In order to restore the history tree correctly, we have to look up
         * all the frames first and then look up the history item. We do this
         * because the history item in the tree may be null at this point.
         * Unfortunately, a HistoryItem can only search its immediately
         * children so we do a breadth-first rebuild of the tree.
         */

        // Keep a small list of child frames to traverse.
        WTF::Vector<WebCore::Frame*> frameQueue;
        // Fix the top-level item.
        pFrame->loader()->history()->setCurrentItem(current.get());
        WebCore::Frame* child = pFrame->tree()->firstChild();
        // Remember the parent history item so we can search for a child item.
        RefPtr<WebCore::HistoryItem> parent = current;
        while (child) {
            // Use the old history item since the current one may have a
            // deleted parent.
            WebCore::HistoryItem* item = parent->childItemWithTarget(child->tree()->name());
            child->loader()->history()->setCurrentItem(item);
            // Append the first child to the queue if it exists. If there is no
            // item, then we do not need to traverse the children since there
            // will be no parent history item.
            WebCore::Frame* firstChild;
            if (item && (firstChild = child->tree()->firstChild()))
                frameQueue.append(firstChild);
            child = child->tree()->nextSibling();
            // If we don't have a sibling for this frame and the queue isn't
            // empty, use the next entry in the queue.
            if (!child && !frameQueue.isEmpty()) {
                child = frameQueue.at(0);
                frameQueue.remove(0);
                // Figure out the parent history item used when searching for
                // the history item to use.
                parent = child->tree()->parent()->loader()->history()->currentItem();
            }
        }
    }
}