third_party/WebKit/Source/web/PageOverlay.cpp

   1 /*
   2  * Copyright (C) 2011 Google 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 are
   6  * met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * 2. Redistributions in binary form must reproduce the above
  12  * copyright notice, this list of conditions and the following disclaimer
  13  * in the documentation and/or other materials provided with the
  14  * distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. AND ITS CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GOOGLE INC.
  20  * OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include "config.h"
  30 #include "web/PageOverlay.h"
  31
  32 #include "core/frame/FrameHost.h"
  33 #include "core/frame/Settings.h"
  34 #include "core/page/Page.h"
  35 #include "platform/graphics/GraphicsContext.h"
  36 #include "platform/graphics/GraphicsLayer.h"
  37 #include "platform/graphics/GraphicsLayerClient.h"
  38 #include "public/platform/WebLayer.h"
  39 #include "public/web/WebViewClient.h"
  40 #include "web/WebDevToolsAgentImpl.h"
  41 #include "web/WebGraphicsContextImpl.h"
  42 #include "web/WebViewImpl.h"
  43
  44 namespace blink {
  45
  46 PassOwnPtr<PageOverlay> PageOverlay::create(WebViewImpl* viewImpl, PageOverlay::Delegate* delegate)
  47 {
  48     return adoptPtr(new PageOverlay(viewImpl, delegate));
  49 }
  50
  51 PageOverlay::PageOverlay(WebViewImpl* viewImpl, PageOverlay::Delegate* delegate)
  52     : m_viewImpl(viewImpl)
  53     , m_delegate(delegate)
  54 {
  55 }
  56
  57 PageOverlay::~PageOverlay()
  58 {
  59     if (!m_layer)
  60         return;
  61
  62     m_layer->removeFromParent();
  63     if (WebDevToolsAgentImpl* devTools = m_viewImpl->mainFrameDevToolsAgentImpl())
  64         devTools->didRemovePageOverlay(m_layer.get());
  65     m_layer = nullptr;
  66 }
  67
  68 void PageOverlay::update()
  69 {
  70     if (!m_viewImpl->isAcceleratedCompositingActive())
  71         return;
  72
  73     Page* page = m_viewImpl->page();
  74     if (!page)
  75         return;
  76
  77     if (!page->mainFrame()->isLocalFrame())
  78         return;
  79
  80     if (!m_layer) {
  81         m_layer = GraphicsLayer::create(m_viewImpl->graphicsLayerFactory(), this);
  82         m_layer->setDrawsContent(true);
  83
  84         if (WebDevToolsAgentImpl* devTools = m_viewImpl->mainFrameDevToolsAgentImpl())
  85             devTools->willAddPageOverlay(m_layer.get());
  86
  87         // This is required for contents of overlay to stay in sync with the page while scrolling.
  88         WebLayer* platformLayer = m_layer->platformLayer();
  89         platformLayer->setShouldScrollOnMainThread(true);
  90         page->frameHost().visualViewport().containerLayer()->addChild(m_layer.get());
  91     }
  92
  93     FloatSize size = page->frameHost().visualViewport().size();
  94     if (size != m_layer->size())
  95         m_layer->setSize(size);
  96
  97     m_layer->setNeedsDisplay();
  98 }
  99
 100 void PageOverlay::paintContents(const GraphicsLayer*, GraphicsContext& gc, GraphicsLayerPaintingPhase, const IntRect& inClip)
 101 {
 102     ASSERT(m_layer);
 103     WebGraphicsContextImpl contextWrapper(gc, *this, DisplayItem::PageOverlay);
 104     m_delegate->paintPageOverlay(&contextWrapper, expandedIntSize(m_layer->size()));
 105 }
 106
 107 String PageOverlay::debugName(const GraphicsLayer*)
 108 {
 109     return "WebViewImpl Page Overlay Content Layer";
 110 }
 111
 112 } // namespace blink