Reland r165710 "Replace RenderFullScreen with top layer"

Source/core/rendering/RenderFullScreen.cpp

-/*
- * Copyright (C) 2010 Apple Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1.  Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- * 2.  Redistributions in binary form must reproduce the above copyright
- *     notice, this list of conditions and the following disclaimer in the
- *     documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "config.h"
-#include "core/rendering/RenderFullScreen.h"
-
-#include "core/dom/FullscreenElementStack.h"
-#include "core/rendering/RenderBlockFlow.h"
-
-using namespace WebCore;
-
-class RenderFullScreenPlaceholder FINAL : public RenderBlockFlow {
-public:
-    RenderFullScreenPlaceholder(RenderFullScreen* owner)
-        : RenderBlockFlow(0)
-        , m_owner(owner)
-    {
-        setDocumentForAnonymous(&owner->document());
-    }
-private:
-    virtual bool isRenderFullScreenPlaceholder() const OVERRIDE { return true; }
-    virtual bool supportsPartialLayout() const OVERRIDE { return false; }
-    virtual void willBeDestroyed() OVERRIDE;
-    RenderFullScreen* m_owner;
-};
-
-void RenderFullScreenPlaceholder::willBeDestroyed()
-{
-    m_owner->setPlaceholder(0);
-    RenderBlock::willBeDestroyed();
-}
-
-RenderFullScreen::RenderFullScreen()
-    : RenderFlexibleBox(0)
-    , m_placeholder(0)
-{
-    setReplaced(false);
-}
-
-RenderFullScreen* RenderFullScreen::createAnonymous(Document* document)
-{
-    RenderFullScreen* renderer = new RenderFullScreen();
-    renderer->setDocumentForAnonymous(document);
-    return renderer;
-}
-
-void RenderFullScreen::willBeDestroyed()
-{
-    if (m_placeholder) {
-        remove();
-        if (!m_placeholder->beingDestroyed())
-            m_placeholder->destroy();
-        ASSERT(!m_placeholder);
-    }
-
-    // RenderObjects are unretained, so notify the document (which holds a pointer to a RenderFullScreen)
-    // if it's RenderFullScreen is destroyed.
-    FullscreenElementStack* controller = FullscreenElementStack::from(&document());
-    if (controller->fullScreenRenderer() == this)
-        controller->fullScreenRendererDestroyed();
-
-    RenderFlexibleBox::willBeDestroyed();
-}
-
-static PassRefPtr<RenderStyle> createFullScreenStyle()
-{
-    RefPtr<RenderStyle> fullscreenStyle = RenderStyle::createDefaultStyle();
-
-    // Create a stacking context:
-    fullscreenStyle->setZIndex(INT_MAX);
-
-    fullscreenStyle->setFontDescription(FontDescription());
-    fullscreenStyle->font().update(0);
-
-    fullscreenStyle->setDisplay(FLEX);
-    fullscreenStyle->setJustifyContent(JustifyCenter);
-    fullscreenStyle->setAlignItems(ItemPositionCenter);
-    fullscreenStyle->setFlexDirection(FlowColumn);
-
-    fullscreenStyle->setPosition(FixedPosition);
-    fullscreenStyle->setWidth(Length(100.0, Percent));
-    fullscreenStyle->setHeight(Length(100.0, Percent));
-    fullscreenStyle->setLeft(Length(0, WebCore::Fixed));
-    fullscreenStyle->setTop(Length(0, WebCore::Fixed));
-
-    fullscreenStyle->setBackgroundColor(StyleColor(Color::black));
-
-    return fullscreenStyle.release();
-}
-
-RenderObject* RenderFullScreen::wrapRenderer(RenderObject* object, RenderObject* parent, Document* document)
-{
-    RenderFullScreen* fullscreenRenderer = RenderFullScreen::createAnonymous(document);
-    fullscreenRenderer->setStyle(createFullScreenStyle());
-    if (parent && !parent->isChildAllowed(fullscreenRenderer, fullscreenRenderer->style())) {
-        fullscreenRenderer->destroy();
-        return 0;
-    }
-    if (object) {
-        // |object->parent()| can be null if the object is not yet attached
-        // to |parent|.
-        if (RenderObject* parent = object->parent()) {
-            RenderBlock* containingBlock = object->containingBlock();
-            ASSERT(containingBlock);
-            // Since we are moving the |object| to a new parent |fullscreenRenderer|,
-            // the line box tree underneath our |containingBlock| is not longer valid.
-            containingBlock->deleteLineBoxTree();
-
-            parent->addChild(fullscreenRenderer, object);
-            object->remove();
-
-            // Always just do a full layout to ensure that line boxes get deleted properly.
-            // Because objects moved from |parent| to |fullscreenRenderer|, we want to
-            // make new line boxes instead of leaving the old ones around.
-            parent->setNeedsLayoutAndPrefWidthsRecalc();
-            containingBlock->setNeedsLayoutAndPrefWidthsRecalc();
-        }
-        fullscreenRenderer->addChild(object);
-        fullscreenRenderer->setNeedsLayoutAndPrefWidthsRecalc();
-    }
-
-    FullscreenElementStack::from(document)->setFullScreenRenderer(fullscreenRenderer);
-    return fullscreenRenderer;
-}
-
-void RenderFullScreen::unwrapRenderer()
-{
-    if (parent()) {
-        RenderObject* child;
-        while ((child = firstChild())) {
-            // We have to clear the override size, because as a flexbox, we
-            // may have set one on the child, and we don't want to leave that
-            // lying around on the child.
-            if (child->isBox())
-                toRenderBox(child)->clearOverrideSize();
-            child->remove();
-            parent()->addChild(child, this);
-            parent()->setNeedsLayoutAndPrefWidthsRecalc();
-        }
-    }
-    if (placeholder())
-        placeholder()->remove();
-    remove();
-    FullscreenElementStack::from(&document())->setFullScreenRenderer(0);
-}
-
-void RenderFullScreen::setPlaceholder(RenderBlock* placeholder)
-{
-    m_placeholder = placeholder;
-}
-
-void RenderFullScreen::createPlaceholder(PassRefPtr<RenderStyle> style, const LayoutRect& frameRect)
-{
-    if (style->width().isAuto())
-        style->setWidth(Length(frameRect.width(), Fixed));
-    if (style->height().isAuto())
-        style->setHeight(Length(frameRect.height(), Fixed));
-
-    if (!m_placeholder) {
-        m_placeholder = new RenderFullScreenPlaceholder(this);
-        m_placeholder->setStyle(style);
-        if (parent()) {
-            parent()->addChild(m_placeholder, this);
-            parent()->setNeedsLayoutAndPrefWidthsRecalc();
-        }
-    } else
-        m_placeholder->setStyle(style);
-}