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      1 /*
      2  * Copyright (C) 2013 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  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "web/FullscreenController.h"
     33 
     34 #include "core/dom/Document.h"
     35 #include "core/dom/FullscreenElementStack.h"
     36 #include "core/frame/LocalFrame.h"
     37 #include "core/html/HTMLMediaElement.h"
     38 #include "platform/LayoutTestSupport.h"
     39 #include "platform/RuntimeEnabledFeatures.h"
     40 #include "public/web/WebFrame.h"
     41 #include "public/web/WebViewClient.h"
     42 #include "web/WebSettingsImpl.h"
     43 #include "web/WebViewImpl.h"
     44 
     45 using namespace WebCore;
     46 
     47 namespace blink {
     48 
     49 PassOwnPtr<FullscreenController> FullscreenController::create(WebViewImpl* webViewImpl)
     50 {
     51     return adoptPtr(new FullscreenController(webViewImpl));
     52 }
     53 
     54 FullscreenController::FullscreenController(WebViewImpl* webViewImpl)
     55     : m_webViewImpl(webViewImpl)
     56     , m_exitFullscreenPageScaleFactor(0)
     57     , m_isCancelingFullScreen(false)
     58 {
     59 }
     60 
     61 void FullscreenController::willEnterFullScreen()
     62 {
     63     if (!m_provisionalFullScreenElement)
     64         return;
     65 
     66     // Ensure that this element's document is still attached.
     67     Document& doc = m_provisionalFullScreenElement->document();
     68     if (doc.frame()) {
     69         FullscreenElementStack::from(doc).webkitWillEnterFullScreenForElement(m_provisionalFullScreenElement.get());
     70         m_fullScreenFrame = doc.frame();
     71     }
     72     m_provisionalFullScreenElement.clear();
     73 }
     74 
     75 void FullscreenController::didEnterFullScreen()
     76 {
     77     if (!m_fullScreenFrame)
     78         return;
     79 
     80     if (Document* doc = m_fullScreenFrame->document()) {
     81         if (FullscreenElementStack::isFullScreen(*doc)) {
     82             if (!m_exitFullscreenPageScaleFactor) {
     83                 m_exitFullscreenPageScaleFactor = m_webViewImpl->pageScaleFactor();
     84                 m_exitFullscreenScrollOffset = m_webViewImpl->mainFrame()->scrollOffset();
     85                 m_exitFullscreenPinchViewportOffset = m_webViewImpl->pinchViewportOffset();
     86                 m_webViewImpl->setPageScaleFactor(1.0f);
     87                 m_webViewImpl->setMainFrameScrollOffset(IntPoint());
     88                 m_webViewImpl->setPinchViewportOffset(FloatPoint());
     89             }
     90 
     91             FullscreenElementStack::from(*doc).webkitDidEnterFullScreenForElement(0);
     92             if (RuntimeEnabledFeatures::overlayFullscreenVideoEnabled()) {
     93                 Element* element = FullscreenElementStack::currentFullScreenElementFrom(*doc);
     94                 ASSERT(element);
     95                 if (isHTMLMediaElement(*element)) {
     96                     HTMLMediaElement* mediaElement = toHTMLMediaElement(element);
     97                     if (mediaElement->webMediaPlayer() && mediaElement->webMediaPlayer()->canEnterFullscreen()
     98                         // FIXME: There is no embedder-side handling in layout test mode.
     99                         && !isRunningLayoutTest()) {
    100                         mediaElement->webMediaPlayer()->enterFullscreen();
    101                     }
    102                     if (m_webViewImpl->layerTreeView())
    103                         m_webViewImpl->layerTreeView()->setHasTransparentBackground(true);
    104                 }
    105             }
    106         }
    107     }
    108 }
    109 
    110 void FullscreenController::willExitFullScreen()
    111 {
    112     if (!m_fullScreenFrame)
    113         return;
    114 
    115     if (Document* doc = m_fullScreenFrame->document()) {
    116         FullscreenElementStack* fullscreen = FullscreenElementStack::fromIfExists(*doc);
    117         if (!fullscreen)
    118             return;
    119         if (fullscreen->isFullScreen(*doc)) {
    120             // When the client exits from full screen we have to call webkitCancelFullScreen to
    121             // notify the document. While doing that, suppress notifications back to the client.
    122             m_isCancelingFullScreen = true;
    123             fullscreen->webkitCancelFullScreen();
    124             m_isCancelingFullScreen = false;
    125             fullscreen->webkitWillExitFullScreenForElement(0);
    126             if (RuntimeEnabledFeatures::overlayFullscreenVideoEnabled() && m_webViewImpl->layerTreeView())
    127                 m_webViewImpl->layerTreeView()->setHasTransparentBackground(m_webViewImpl->isTransparent());
    128         }
    129     }
    130 }
    131 
    132 void FullscreenController::didExitFullScreen()
    133 {
    134     if (!m_fullScreenFrame)
    135         return;
    136 
    137     if (Document* doc = m_fullScreenFrame->document()) {
    138         if (FullscreenElementStack* fullscreen = FullscreenElementStack::fromIfExists(*doc)) {
    139             if (fullscreen->webkitIsFullScreen()) {
    140                 if (m_exitFullscreenPageScaleFactor) {
    141                     m_webViewImpl->setPageScaleFactor(m_exitFullscreenPageScaleFactor);
    142                     m_webViewImpl->setMainFrameScrollOffset(IntPoint(m_exitFullscreenScrollOffset));
    143                     m_webViewImpl->setPinchViewportOffset(m_exitFullscreenPinchViewportOffset);
    144                     m_exitFullscreenPageScaleFactor = 0;
    145                     m_exitFullscreenScrollOffset = IntSize();
    146                 }
    147 
    148                 fullscreen->webkitDidExitFullScreenForElement(0);
    149             }
    150         }
    151     }
    152 
    153     m_fullScreenFrame.clear();
    154 }
    155 
    156 void FullscreenController::enterFullScreenForElement(WebCore::Element* element)
    157 {
    158     // We are already transitioning to fullscreen for a different element.
    159     if (m_provisionalFullScreenElement) {
    160         m_provisionalFullScreenElement = element;
    161         return;
    162     }
    163 
    164     // We are already in fullscreen mode.
    165     if (m_fullScreenFrame) {
    166         m_provisionalFullScreenElement = element;
    167         willEnterFullScreen();
    168         didEnterFullScreen();
    169         return;
    170     }
    171 
    172     // We need to transition to fullscreen mode.
    173     if (WebViewClient* client = m_webViewImpl->client()) {
    174         if (client->enterFullScreen())
    175             m_provisionalFullScreenElement = element;
    176     }
    177 }
    178 
    179 void FullscreenController::exitFullScreenForElement(WebCore::Element* element)
    180 {
    181     // The client is exiting full screen, so don't send a notification.
    182     if (m_isCancelingFullScreen)
    183         return;
    184     if (WebViewClient* client = m_webViewImpl->client())
    185         client->exitFullScreen();
    186 }
    187 
    188 }
    189 
    190