renderview.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

}
#endif

void RenderView::setSelection(RenderObject* start, int startPos, RenderObject* end, int endPos)
{
    // Make sure both our start and end objects are defined.
    // Check www.msnbc.com and try clicking around to find the case where this happened.
    if ((start && !end) || (end && !start))
        return;

    // Just return if the selection hasn't changed.
    if (m_selectionStart == start && m_selectionStartPos == startPos &&
        m_selectionEnd == end && m_selectionEndPos == endPos)
        return;

    // Record the old selected objects.  These will be used later
    // when we compare against the new selected objects.
    int oldStartPos = m_selectionStartPos;
    int oldEndPos = m_selectionEndPos;

    // Objects each have a single selection rect to examine.
    typedef HashMap<RenderObject*, RenderSelectionInfo*> SelectedObjectMap;
    SelectedObjectMap oldSelectedObjects;
    SelectedObjectMap newSelectedObjects;

    // Blocks contain selected objects and fill gaps between them, either on the left, right, or in between lines and blocks.
    // In order to get the repaint rect right, we have to examine left, middle, and right rects individually, since otherwise
    // the union of those rects might remain the same even when changes have occurred.
    typedef HashMap<RenderBlock*, RenderBlockSelectionInfo*> SelectedBlockMap;
    SelectedBlockMap oldSelectedBlocks;
    SelectedBlockMap newSelectedBlocks;

    RenderObject* os = m_selectionStart;
    RenderObject* stop = rendererAfterPosition(m_selectionEnd, m_selectionEndPos);
    while (os && os != stop) {
        if ((os->canBeSelectionLeaf() || os == m_selectionStart || os == m_selectionEnd) && os->selectionState() != SelectionNone) {
            // Blocks are responsible for painting line gaps and margin gaps.  They must be examined as well.
            oldSelectedObjects.set(os, new RenderSelectionInfo(os, true));
            RenderBlock* cb = os->containingBlock();
            while (cb && !cb->isRenderView()) {
                RenderBlockSelectionInfo* blockInfo = oldSelectedBlocks.get(cb);
                if (blockInfo)
                    break;
                oldSelectedBlocks.set(cb, new RenderBlockSelectionInfo(cb));
                cb = cb->containingBlock();
            }
        }

        os = os->nextInPreOrder();
    }

    // Now clear the selection.
    SelectedObjectMap::iterator oldObjectsEnd = oldSelectedObjects.end();
    for (SelectedObjectMap::iterator i = oldSelectedObjects.begin(); i != oldObjectsEnd; ++i)
        i->first->setSelectionState(SelectionNone);

    // set selection start and end
    m_selectionStart = start;
    m_selectionStartPos = startPos;
    m_selectionEnd = end;
    m_selectionEndPos = endPos;

    // Update the selection status of all objects between m_selectionStart and m_selectionEnd
    if (start && start == end)
        start->setSelectionState(SelectionBoth);
    else {
        if (start)
            start->setSelectionState(SelectionStart);
        if (end)
            end->setSelectionState(SelectionEnd);
    }

    RenderObject* o = start;
    stop = rendererAfterPosition(end, endPos);

    while (o && o != stop) {
        if (o != start && o != end && o->canBeSelectionLeaf())
            o->setSelectionState(SelectionInside);
        o = o->nextInPreOrder();
    }

    // Now that the selection state has been updated for the new objects, walk them again and
    // put them in the new objects list.
    o = start;
    while (o && o != stop) {
        if ((o->canBeSelectionLeaf() || o == start || o == end) && o->selectionState() != SelectionNone) {
            newSelectedObjects.set(o, new RenderSelectionInfo(o, true));
            RenderBlock* cb = o->containingBlock();
            while (cb && !cb->isRenderView()) {
                RenderBlockSelectionInfo* blockInfo = newSelectedBlocks.get(cb);
                if (blockInfo)
                    break;
                newSelectedBlocks.set(cb, new RenderBlockSelectionInfo(cb));
                cb = cb->containingBlock();
            }
        }

        o = o->nextInPreOrder();
    }

    if (!m_frameView) {
        // We built the maps, but we aren't going to use them.
        // We need to delete the values, otherwise they'll all leak!
        deleteAllValues(oldSelectedObjects);
        deleteAllValues(newSelectedObjects);
        deleteAllValues(oldSelectedBlocks);
        deleteAllValues(newSelectedBlocks);
        return;
    }

    // Have any of the old selected objects changed compared to the new selection?
    for (SelectedObjectMap::iterator i = oldSelectedObjects.begin(); i != oldObjectsEnd; ++i) {
        RenderObject* obj = i->first;
        RenderSelectionInfo* newInfo = newSelectedObjects.get(obj);
        RenderSelectionInfo* oldInfo = i->second;
        if (!newInfo || oldInfo->rect() != newInfo->rect() || oldInfo->state() != newInfo->state() ||
            (m_selectionStart == obj && oldStartPos != m_selectionStartPos) ||
            (m_selectionEnd == obj && oldEndPos != m_selectionEndPos)) {
            oldInfo->repaint();
            if (newInfo) {
                newInfo->repaint();
                newSelectedObjects.remove(obj);
                delete newInfo;
            }
        }
        delete oldInfo;
    }

    // Any new objects that remain were not found in the old objects dict, and so they need to be updated.
    SelectedObjectMap::iterator newObjectsEnd = newSelectedObjects.end();
    for (SelectedObjectMap::iterator i = newSelectedObjects.begin(); i != newObjectsEnd; ++i) {
        RenderSelectionInfo* newInfo = i->second;
        newInfo->repaint();
        delete newInfo;
    }

    // Have any of the old blocks changed?
    SelectedBlockMap::iterator oldBlocksEnd = oldSelectedBlocks.end();
    for (SelectedBlockMap::iterator i = oldSelectedBlocks.begin(); i != oldBlocksEnd; ++i) {
        RenderBlock* block = i->first;
        RenderBlockSelectionInfo* newInfo = newSelectedBlocks.get(block);
        RenderBlockSelectionInfo* oldInfo = i->second;
        if (!newInfo || oldInfo->rects() != newInfo->rects() || oldInfo->state() != newInfo->state()) {
            oldInfo->repaint();
            if (newInfo) {
                newInfo->repaint();
                newSelectedBlocks.remove(block);
                delete newInfo;
            }
        }
        delete oldInfo;
    }

    // Any new blocks that remain were not found in the old blocks dict, and so they need to be updated.
    SelectedBlockMap::iterator newBlocksEnd = newSelectedBlocks.end();
    for (SelectedBlockMap::iterator i = newSelectedBlocks.begin(); i != newBlocksEnd; ++i) {
        RenderBlockSelectionInfo* newInfo = i->second;
        newInfo->repaint();
        delete newInfo;
    }
}

void RenderView::clearSelection()
{
    setSelection(0, -1, 0, -1);
}

void RenderView::selectionStartEnd(int& startPos, int& endPos) const
{
    startPos = m_selectionStartPos;
    endPos = m_selectionEndPos;
}

bool RenderView::printing() const
{
    return document()->printing();
}

void RenderView::updateWidgetPositions()
{
    RenderWidgetSet::iterator end = m_widgets.end();
    for (RenderWidgetSet::iterator it = m_widgets.begin(); it != end; ++it)
        (*it)->updateWidgetPosition();
}

void RenderView::addWidget(RenderWidget* o)
{
    m_widgets.add(o);
}

void RenderView::removeWidget(RenderWidget* o)
{
    m_widgets.remove(o);
}

IntRect RenderView::viewRect() const
{
    if (printing())
        return IntRect(0, 0, width(), height());
    if (m_frameView)
        return m_frameView->visibleContentRect();
    return IntRect();
}

int RenderView::docHeight() const
{
    int h = height();
    int lowestPos = lowestPosition();
    if (lowestPos > h)
        h = lowestPos;

    // FIXME: This doesn't do any margin collapsing.
    // Instead of this dh computation we should keep the result
    // when we call RenderBlock::layout.
    int dh = 0;
    for (RenderBox* c = firstChildBox(); c; c = c->nextSiblingBox())
        dh += c->height() + c->marginTop() + c->marginBottom();

    if (dh > h)
        h = dh;

    return h;
}

int RenderView::docWidth() const
{
    int w = width();
    int rightmostPos = rightmostPosition();
    if (rightmostPos > w)
        w = rightmostPos;
    
    for (RenderBox* c = firstChildBox(); c; c = c->nextSiblingBox()) {
        int dw = c->width() + c->marginLeft() + c->marginRight();
        if (dw > w)
            w = dw;
    }

    return w;
}

int RenderView::viewHeight() const
{
    int height = 0;
    if (!printing() && m_frameView) {
        height = m_frameView->layoutHeight();
        height = m_frameView->useFixedLayout() ? ceilf(style()->effectiveZoom() * float(height)) : height;
    }
    return height;
}

int RenderView::viewWidth() const
{
    int width = 0;
    if (!printing() && m_frameView) {
        width = m_frameView->layoutWidth();
        width = m_frameView->useFixedLayout() ? ceilf(style()->effectiveZoom() * float(width)) : width;
    }
    return width;
}

float RenderView::zoomFactor() const
{
    if (m_frameView->frame() && m_frameView->frame()->shouldApplyPageZoom())
        return m_frameView->frame()->zoomFactor();

    return 1.0f;
}

// The idea here is to take into account what object is moving the pagination point, and
// thus choose the best place to chop it.
void RenderView::setBestTruncatedAt(int y, RenderBoxModelObject* forRenderer, bool forcedBreak)
{
    // Nobody else can set a page break once we have a forced break.
    if (m_forcedPageBreak)
        return;

    // Forced breaks always win over unforced breaks.
    if (forcedBreak) {
        m_forcedPageBreak = true;
        m_bestTruncatedAt = y;
        return;
    }

    // Prefer the widest object that tries to move the pagination point
    IntRect boundingBox = forRenderer->borderBoundingBox();
    if (boundingBox.width() > m_truncatorWidth) {
        m_truncatorWidth = boundingBox.width();
        m_bestTruncatedAt = y;
    }
}

void RenderView::pushLayoutState(RenderObject* root)
{
    ASSERT(!doingFullRepaint());
    ASSERT(m_layoutStateDisableCount == 0);
    ASSERT(m_layoutState == 0);

    m_layoutState = new (renderArena()) LayoutState(root);
}

void RenderView::updateHitTestResult(HitTestResult& result, const IntPoint& point)
{
    if (result.innerNode())
        return;

    Node* node = document()->documentElement();
    if (node) {
        result.setInnerNode(node);
        if (!result.innerNonSharedNode())
            result.setInnerNonSharedNode(node);
        result.setLocalPoint(point);
    }
}

#if USE(ACCELERATED_COMPOSITING)
bool RenderView::usesCompositing() const
{
    return m_compositor && m_compositor->inCompositingMode();
}

RenderLayerCompositor* RenderView::compositor()
{
    if (!m_compositor)
        m_compositor.set(new RenderLayerCompositor(this));

    return m_compositor.get();
}
#endif

void RenderView::didMoveOnscreen()
{
#if USE(ACCELERATED_COMPOSITING)
    if (m_compositor)
        m_compositor->didMoveOnscreen();
#endif
}

void RenderView::willMoveOffscreen()
{
#if USE(ACCELERATED_COMPOSITING)
    if (m_compositor)
        m_compositor->willMoveOffscreen();
#endif
}

} // namespace WebCore