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      1 /*
      2  * Copyright (C) 2010 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1.  Redistributions of source code must retain the above copyright
      8  *     notice, this list of conditions and the following disclaimer.
      9  * 2.  Redistributions in binary form must reproduce the above copyright
     10  *     notice, this list of conditions and the following disclaimer in the
     11  *     documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     16  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     17  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     20  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     22  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23  */
     24 
     25 #include "config.h"
     26 #include "core/rendering/RenderFullScreen.h"
     27 
     28 #include "core/dom/FullscreenElementStack.h"
     29 #include "core/rendering/RenderBlockFlow.h"
     30 
     31 using namespace WebCore;
     32 
     33 class RenderFullScreenPlaceholder FINAL : public RenderBlockFlow {
     34 public:
     35     RenderFullScreenPlaceholder(RenderFullScreen* owner)
     36         : RenderBlockFlow(0)
     37         , m_owner(owner)
     38     {
     39         setDocumentForAnonymous(&owner->document());
     40     }
     41 private:
     42     virtual bool isRenderFullScreenPlaceholder() const OVERRIDE { return true; }
     43     virtual void willBeDestroyed() OVERRIDE;
     44     RenderFullScreen* m_owner;
     45 };
     46 
     47 void RenderFullScreenPlaceholder::willBeDestroyed()
     48 {
     49     m_owner->setPlaceholder(0);
     50     RenderBlock::willBeDestroyed();
     51 }
     52 
     53 RenderFullScreen::RenderFullScreen()
     54     : RenderFlexibleBox(0)
     55     , m_placeholder(0)
     56 {
     57     setReplaced(false);
     58 }
     59 
     60 RenderFullScreen* RenderFullScreen::createAnonymous(Document* document)
     61 {
     62     RenderFullScreen* renderer = new RenderFullScreen();
     63     renderer->setDocumentForAnonymous(document);
     64     return renderer;
     65 }
     66 
     67 void RenderFullScreen::willBeDestroyed()
     68 {
     69     if (m_placeholder) {
     70         remove();
     71         if (!m_placeholder->beingDestroyed())
     72             m_placeholder->destroy();
     73         ASSERT(!m_placeholder);
     74     }
     75 
     76     // RenderObjects are unretained, so notify the document (which holds a pointer to a RenderFullScreen)
     77     // if it's RenderFullScreen is destroyed.
     78     FullscreenElementStack& controller = FullscreenElementStack::from(document());
     79     if (controller.fullScreenRenderer() == this)
     80         controller.fullScreenRendererDestroyed();
     81 
     82     RenderFlexibleBox::willBeDestroyed();
     83 }
     84 
     85 static PassRefPtr<RenderStyle> createFullScreenStyle()
     86 {
     87     RefPtr<RenderStyle> fullscreenStyle = RenderStyle::createDefaultStyle();
     88 
     89     // Create a stacking context:
     90     fullscreenStyle->setZIndex(INT_MAX);
     91 
     92     fullscreenStyle->setFontDescription(FontDescription());
     93     fullscreenStyle->font().update(nullptr);
     94 
     95     fullscreenStyle->setDisplay(FLEX);
     96     fullscreenStyle->setJustifyContent(JustifyCenter);
     97     fullscreenStyle->setAlignItems(ItemPositionCenter);
     98     fullscreenStyle->setFlexDirection(FlowColumn);
     99 
    100     fullscreenStyle->setPosition(FixedPosition);
    101     fullscreenStyle->setWidth(Length(100.0, Percent));
    102     fullscreenStyle->setHeight(Length(100.0, Percent));
    103     fullscreenStyle->setLeft(Length(0, WebCore::Fixed));
    104     fullscreenStyle->setTop(Length(0, WebCore::Fixed));
    105 
    106     fullscreenStyle->setBackgroundColor(StyleColor(Color::black));
    107 
    108     return fullscreenStyle.release();
    109 }
    110 
    111 RenderObject* RenderFullScreen::wrapRenderer(RenderObject* object, RenderObject* parent, Document* document)
    112 {
    113     // FIXME: We should not modify the structure of the render tree during
    114     // layout. crbug.com/370459
    115     DeprecatedDisableModifyRenderTreeStructureAsserts disabler;
    116 
    117     RenderFullScreen* fullscreenRenderer = RenderFullScreen::createAnonymous(document);
    118     fullscreenRenderer->setStyle(createFullScreenStyle());
    119     if (parent && !parent->isChildAllowed(fullscreenRenderer, fullscreenRenderer->style())) {
    120         fullscreenRenderer->destroy();
    121         return 0;
    122     }
    123     if (object) {
    124         // |object->parent()| can be null if the object is not yet attached
    125         // to |parent|.
    126         if (RenderObject* parent = object->parent()) {
    127             RenderBlock* containingBlock = object->containingBlock();
    128             ASSERT(containingBlock);
    129             // Since we are moving the |object| to a new parent |fullscreenRenderer|,
    130             // the line box tree underneath our |containingBlock| is not longer valid.
    131             containingBlock->deleteLineBoxTree();
    132 
    133             parent->addChild(fullscreenRenderer, object);
    134             object->remove();
    135 
    136             // Always just do a full layout to ensure that line boxes get deleted properly.
    137             // Because objects moved from |parent| to |fullscreenRenderer|, we want to
    138             // make new line boxes instead of leaving the old ones around.
    139             parent->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
    140             containingBlock->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
    141         }
    142         fullscreenRenderer->addChild(object);
    143         fullscreenRenderer->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
    144     }
    145 
    146     ASSERT(document);
    147     FullscreenElementStack::from(*document).setFullScreenRenderer(fullscreenRenderer);
    148     return fullscreenRenderer;
    149 }
    150 
    151 void RenderFullScreen::unwrapRenderer()
    152 {
    153     // FIXME: We should not modify the structure of the render tree during
    154     // layout. crbug.com/370459
    155     DeprecatedDisableModifyRenderTreeStructureAsserts disabler;
    156 
    157     if (parent()) {
    158         RenderObject* child;
    159         while ((child = firstChild())) {
    160             // We have to clear the override size, because as a flexbox, we
    161             // may have set one on the child, and we don't want to leave that
    162             // lying around on the child.
    163             if (child->isBox())
    164                 toRenderBox(child)->clearOverrideSize();
    165             child->remove();
    166             parent()->addChild(child, this);
    167             parent()->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
    168         }
    169     }
    170     if (placeholder())
    171         placeholder()->remove();
    172     remove();
    173     destroy();
    174 }
    175 
    176 void RenderFullScreen::setPlaceholder(RenderBlock* placeholder)
    177 {
    178     m_placeholder = placeholder;
    179 }
    180 
    181 void RenderFullScreen::createPlaceholder(PassRefPtr<RenderStyle> style, const LayoutRect& frameRect)
    182 {
    183     if (style->width().isAuto())
    184         style->setWidth(Length(frameRect.width(), Fixed));
    185     if (style->height().isAuto())
    186         style->setHeight(Length(frameRect.height(), Fixed));
    187 
    188     if (!m_placeholder) {
    189         m_placeholder = new RenderFullScreenPlaceholder(this);
    190         m_placeholder->setStyle(style);
    191         if (parent()) {
    192             parent()->addChild(m_placeholder, this);
    193             parent()->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
    194         }
    195     } else
    196         m_placeholder->setStyle(style);
    197 }
    198