Implement FullScreen using top layer.

third_party/WebKit/Source/core/layout/LayoutFullScreen.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/layout/LayoutFullScreen.h"
-
-#include "core/dom/Fullscreen.h"
-#include "core/frame/FrameHost.h"
-#include "core/frame/Settings.h"
-#include "core/layout/LayoutBlockFlow.h"
-#include "core/page/Page.h"
-
-#include "public/platform/WebScreenInfo.h"
-
-using namespace blink;
-
-class LayoutFullScreenPlaceholder final : public LayoutBlockFlow {
-public:
-    LayoutFullScreenPlaceholder(LayoutFullScreen* owner)
-        : LayoutBlockFlow(nullptr)
-        , m_owner(owner)
-    {
-        setDocumentForAnonymous(&owner->document());
-    }
-private:
-    bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectLayoutFullScreenPlaceholder || LayoutBlockFlow::isOfType(type); }
-    void willBeDestroyed() override;
-    LayoutFullScreen* m_owner;
-};
-
-void LayoutFullScreenPlaceholder::willBeDestroyed()
-{
-    m_owner->setPlaceholder(nullptr);
-    LayoutBlockFlow::willBeDestroyed();
-}
-
-LayoutFullScreen::LayoutFullScreen()
-    : LayoutFlexibleBox(nullptr)
-    , m_placeholder(nullptr)
-{
-    setReplaced(false);
-}
-
-LayoutFullScreen* LayoutFullScreen::createAnonymous(Document* document)
-{
-    LayoutFullScreen* layoutObject = new LayoutFullScreen();
-    layoutObject->setDocumentForAnonymous(document);
-    return layoutObject;
-}
-
-void LayoutFullScreen::willBeDestroyed()
-{
-    if (m_placeholder) {
-        remove();
-        if (!m_placeholder->beingDestroyed())
-            m_placeholder->destroy();
-        ASSERT(!m_placeholder);
-    }
-
-    // LayoutObjects are unretained, so notify the document (which holds a pointer to a LayoutFullScreen)
-    // if its LayoutFullScreen is destroyed.
-    Fullscreen& fullscreen = Fullscreen::from(document());
-    if (fullscreen.fullScreenLayoutObject() == this)
-        fullscreen.fullScreenLayoutObjectDestroyed();
-
-    LayoutFlexibleBox::willBeDestroyed();
-}
-
-void LayoutFullScreen::updateStyle()
-{
-    RefPtr<ComputedStyle> fullscreenStyle = ComputedStyle::create();
-
-    // Create a stacking context:
-    fullscreenStyle->setZIndex(INT_MAX);
-
-    fullscreenStyle->setFontDescription(FontDescription());
-    fullscreenStyle->font().update(nullptr);
-
-    fullscreenStyle->setDisplay(FLEX);
-    fullscreenStyle->setJustifyContentPosition(ContentPositionCenter);
-    fullscreenStyle->setAlignItemsPosition(ItemPositionCenter);
-    fullscreenStyle->setFlexDirection(FlowColumn);
-
-    fullscreenStyle->setPosition(FixedPosition);
-    fullscreenStyle->setLeft(Length(0, blink::Fixed));
-    fullscreenStyle->setTop(Length(0, blink::Fixed));
-    IntSize viewportSize = document().page()->frameHost().visualViewport().size();
-    fullscreenStyle->setWidth(Length(viewportSize.width(), blink::Fixed));
-    fullscreenStyle->setHeight(Length(viewportSize.height(), blink::Fixed));
-
-    fullscreenStyle->setBackgroundColor(StyleColor(Color::black));
-
-    setStyle(fullscreenStyle);
-}
-
-LayoutObject* LayoutFullScreen::wrapLayoutObject(LayoutObject* object, LayoutObject* parent, Document* document)
-{
-    // FIXME: We should not modify the structure of the layout tree during
-    // layout. crbug.com/370459
-    DeprecatedDisableModifyLayoutTreeStructureAsserts disabler;
-
-    LayoutFullScreen* fullscreenLayoutObject = LayoutFullScreen::createAnonymous(document);
-    fullscreenLayoutObject->updateStyle();
-    if (parent && !parent->isChildAllowed(fullscreenLayoutObject, fullscreenLayoutObject->styleRef())) {
-        fullscreenLayoutObject->destroy();
-        return nullptr;
-    }
-    if (object) {
-        // |object->parent()| can be null if the object is not yet attached
-        // to |parent|.
-        if (LayoutObject* parent = object->parent()) {
-            LayoutBlock* containingBlock = object->containingBlock();
-            ASSERT(containingBlock);
-            // Since we are moving the |object| to a new parent |fullscreenLayoutObject|,
-            // the line box tree underneath our |containingBlock| is not longer valid.
-            containingBlock->deleteLineBoxTree();
-
-            parent->addChild(fullscreenLayoutObject, object);
-            object->remove();
-
-            // Always just do a full layout to ensure that line boxes get deleted properly.
-            // Because objects moved from |parent| to |fullscreenLayoutObject|, we want to
-            // make new line boxes instead of leaving the old ones around.
-            parent->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::Fullscreen);
-            containingBlock->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::Fullscreen);
-        }
-        fullscreenLayoutObject->addChild(object);
-        fullscreenLayoutObject->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::Fullscreen);
-    }
-
-    ASSERT(document);
-    Fullscreen::from(*document).setFullScreenLayoutObject(fullscreenLayoutObject);
-    return fullscreenLayoutObject;
-}
-
-void LayoutFullScreen::unwrapLayoutObject()
-{
-    // FIXME: We should not modify the structure of the layout tree during
-    // layout. crbug.com/370459
-    DeprecatedDisableModifyLayoutTreeStructureAsserts disabler;
-
-    if (parent()) {
-        for (LayoutObject* child = firstChild(); child; 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())
-                toLayoutBox(child)->clearOverrideSize();
-            child->remove();
-            parent()->addChild(child, this);
-            parent()->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::Fullscreen);
-        }
-    }
-    if (placeholder())
-        placeholder()->remove();
-    remove();
-    destroy();
-}
-
-void LayoutFullScreen::setPlaceholder(LayoutBlock* placeholder)
-{
-    m_placeholder = placeholder;
-}
-
-void LayoutFullScreen::createPlaceholder(PassRefPtr<ComputedStyle> 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 LayoutFullScreenPlaceholder(this);
-        m_placeholder->setStyle(style);
-        if (parent()) {
-            parent()->addChild(m_placeholder, this);
-            parent()->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::Fullscreen);
-        }
-    } else {
-        m_placeholder->setStyle(style);
-    }
-}