Revert "Implement FullScreen using top layer."

third_party/WebKit/Source/core/layout/LayoutFullScreen.cpp

Index: third_party/WebKit/Source/core/layout/LayoutFullScreen.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutFullScreen.cpp b/third_party/WebKit/Source/core/layout/LayoutFullScreen.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..e65a678e8fe9cd0a1e26ea512aa2818a97818051
--- /dev/null
+++ b/third_party/WebKit/Source/core/layout/LayoutFullScreen.cpp
@@ -0,0 +1,203 @@
+/*
+ * 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);
+    }
+}