Source/web/FullscreenController.cpp

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 * in the documentation and/or other materials provided with the
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "config.h"
#include "web/FullscreenController.h"

#include "core/dom/Document.h"
#include "core/dom/FullscreenElementStack.h"
#include "core/frame/LocalFrame.h"
#include "core/html/HTMLMediaElement.h"
#include "platform/LayoutTestSupport.h"
#include "platform/RuntimeEnabledFeatures.h"
#include "public/web/WebFrame.h"
#include "public/web/WebViewClient.h"
#include "web/WebSettingsImpl.h"
#include "web/WebViewImpl.h"

namespace blink {

PassOwnPtr<FullscreenController> FullscreenController::create(WebViewImpl* webViewImpl)
{
    return adoptPtr(new FullscreenController(webViewImpl));
}

FullscreenController::FullscreenController(WebViewImpl* webViewImpl)
    : m_webViewImpl(webViewImpl)
    , m_exitFullscreenPageScaleFactor(0)
    , m_isCancelingFullScreen(false)
{
}

void FullscreenController::willEnterFullScreen()
{
    if (!m_provisionalFullScreenElement)
        return;

    // Ensure that this element's document is still attached.
    Document& doc = m_provisionalFullScreenElement->document();
    if (doc.frame()) {
        FullscreenElementStack::from(doc).willEnterFullScreenForElement(m_provisionalFullScreenElement.get());
        m_fullScreenFrame = doc.frame();
    }
    m_provisionalFullScreenElement.clear();
}

void FullscreenController::didEnterFullScreen()
{
    if (!m_fullScreenFrame)
        return;

    if (Document* doc = m_fullScreenFrame->document()) {
        if (FullscreenElementStack::isFullScreen(*doc)) {
            if (!m_exitFullscreenPageScaleFactor) {
                m_exitFullscreenPageScaleFactor = m_webViewImpl->pageScaleFactor();
                m_exitFullscreenScrollOffset = m_webViewImpl->mainFrame()->scrollOffset();
                m_exitFullscreenPinchViewportOffset = m_webViewImpl->pinchViewportOffset();
                m_webViewImpl->setPageScaleFactor(1.0f);
                m_webViewImpl->setMainFrameScrollOffset(IntPoint());
                m_webViewImpl->setPinchViewportOffset(FloatPoint());
            }

            FullscreenElementStack::from(*doc).didEnterFullScreenForElement(0);
            if (RuntimeEnabledFeatures::overlayFullscreenVideoEnabled()) {
                Element* element = FullscreenElementStack::currentFullScreenElementFrom(*doc);
                ASSERT(element);
                if (isHTMLMediaElement(*element)) {
                    HTMLMediaElement* mediaElement = toHTMLMediaElement(element);
                    if (mediaElement->webMediaPlayer() && mediaElement->webMediaPlayer()->canEnterFullscreen()
                        // FIXME: There is no embedder-side handling in layout test mode.
                        && !LayoutTestSupport::isRunningLayoutTest()) {
                        mediaElement->webMediaPlayer()->enterFullscreen();
                    }
                    if (m_webViewImpl->layerTreeView())
                        m_webViewImpl->layerTreeView()->setHasTransparentBackground(true);
                }
            }
        }
    }
}

void FullscreenController::willExitFullScreen()
{
    if (!m_fullScreenFrame)
        return;

    if (Document* doc = m_fullScreenFrame->document()) {
        FullscreenElementStack* fullscreen = FullscreenElementStack::fromIfExists(*doc);
        if (!fullscreen)
            return;
        if (fullscreen->isFullScreen(*doc)) {
            // When the client exits from full screen we have to call fullyExitFullscreen to notify
            // the document. While doing that, suppress notifications back to the client.
            m_isCancelingFullScreen = true;
            fullscreen->fullyExitFullscreen();
            m_isCancelingFullScreen = false;
            fullscreen->willExitFullScreenForElement(0);
            if (RuntimeEnabledFeatures::overlayFullscreenVideoEnabled() && m_webViewImpl->layerTreeView())
                m_webViewImpl->layerTreeView()->setHasTransparentBackground(m_webViewImpl->isTransparent());
        }
    }
}

void FullscreenController::didExitFullScreen()
{
    if (!m_fullScreenFrame)
        return;

    if (Document* doc = m_fullScreenFrame->document()) {
        if (FullscreenElementStack* fullscreen = FullscreenElementStack::fromIfExists(*doc)) {
            if (fullscreen->webkitIsFullScreen()) {
                if (m_exitFullscreenPageScaleFactor) {
                    m_webViewImpl->setPageScaleFactor(m_exitFullscreenPageScaleFactor);
                    m_webViewImpl->setMainFrameScrollOffset(IntPoint(m_exitFullscreenScrollOffset));
                    m_webViewImpl->setPinchViewportOffset(m_exitFullscreenPinchViewportOffset);
                    m_exitFullscreenPageScaleFactor = 0;
                    m_exitFullscreenScrollOffset = IntSize();
                }

                fullscreen->didExitFullScreenForElement(0);
            }
        }
    }

    m_fullScreenFrame.clear();
}

void FullscreenController::enterFullScreenForElement(Element* element)
{
    // We are already transitioning to fullscreen for a different element.
    if (m_provisionalFullScreenElement) {
        m_provisionalFullScreenElement = element;
        return;
    }

    // We are already in fullscreen mode.
    if (m_fullScreenFrame) {
        m_provisionalFullScreenElement = element;
        willEnterFullScreen();
        didEnterFullScreen();
        return;
    }

    // We need to transition to fullscreen mode.
    if (WebViewClient* client = m_webViewImpl->client()) {
        if (client->enterFullScreen())
            m_provisionalFullScreenElement = element;
    }
}

void FullscreenController::exitFullScreenForElement(Element* element)
{
    // The client is exiting full screen, so don't send a notification.
    if (m_isCancelingFullScreen)
        return;
    if (WebViewClient* client = m_webViewImpl->client())
        client->exitFullScreen();
}

} // namespace blink