text: /*
   * 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 "PageOverlay.h"
  
  #include "WebPage.h"
  #include "WebProcess.h"
  #include <WebCore/Frame.h>
  #include <WebCore/FrameView.h>
  #include <WebCore/GraphicsContext.h>
  #include <WebCore/Page.h>
  #include <WebCore/ScrollbarTheme.h>
  
  using namespace WebCore;
  
  namespace WebKit {
  
  static const double fadeAnimationDuration = 0.2;
  static const double fadeAnimationFrameRate = 30;
  
  PassRefPtr<PageOverlay> PageOverlay::create(Client* client)
  {
      return adoptRef(new PageOverlay(client));
  }
  
  PageOverlay::PageOverlay(Client* client)
      : m_client(client)
      , m_webPage(0)
      , m_fadeAnimationTimer(WebProcess::shared().runLoop(), this, &PageOverlay::fadeAnimationTimerFired)
      , m_fadeAnimationStartTime(0.0)
      , m_fadeAnimationDuration(fadeAnimationDuration)
      , m_fadeAnimationType(NoAnimation)
      , m_fractionFadedIn(1.0)
  {
  }
  
  PageOverlay::~PageOverlay()
  {
  }
  
  IntRect PageOverlay::bounds() const
  {
      FrameView* frameView = m_webPage->corePage()->mainFrame()->view();
  
      int width = frameView->width();
      int height = frameView->height();
  
      if (!ScrollbarTheme::nativeTheme()->usesOverlayScrollbars()) {
          if (frameView->verticalScrollbar())
              width -= frameView->verticalScrollbar()->width();
          if (frameView->horizontalScrollbar())
              height -= frameView->horizontalScrollbar()->height();
      }    
      return IntRect(0, 0, width, height);
  }
  
  void PageOverlay::setPage(WebPage* webPage)
  {
      m_client->willMoveToWebPage(this, webPage);
      m_webPage = webPage;
      m_client->didMoveToWebPage(this, webPage);
  
      m_fadeAnimationTimer.stop();
  }
  
  void PageOverlay::setNeedsDisplay(const IntRect& dirtyRect)
  {
      if (m_webPage)
          m_webPage->drawingArea()->setPageOverlayNeedsDisplay(dirtyRect);
  }
  
  void PageOverlay::setNeedsDisplay()
  {
      setNeedsDisplay(bounds());
  }
  
  void PageOverlay::drawRect(GraphicsContext& graphicsContext, const IntRect& dirtyRect)
  {
      // If the dirty rect is outside the bounds, ignore it.
      IntRect paintRect = intersection(dirtyRect, bounds());
      if (paintRect.isEmpty())
          return;
  
      graphicsContext.save();
      graphicsContext.beginTransparencyLayer(1);
      graphicsContext.setCompositeOperation(CompositeCopy);
  
      m_client->drawRect(this, graphicsContext, paintRect);
  
      graphicsContext.endTransparencyLayer();
      graphicsContext.restore();
  }
      
  bool PageOverlay::mouseEvent(const WebMouseEvent& mouseEvent)
  {
      // Ignore events outside the bounds.
      if (!bounds().contains(mouseEvent.position()))
          return false;
  
      return m_client->mouseEvent(this, mouseEvent);
  }
  
  void PageOverlay::startFadeInAnimation()
  {
      m_fractionFadedIn = 0.0;
      m_fadeAnimationType = FadeInAnimation;
  
      startFadeAnimation();
  }
  
  void PageOverlay::startFadeOutAnimation()
  {
      m_fractionFadedIn = 1.0;
      m_fadeAnimationType = FadeOutAnimation;
  
      startFadeAnimation();
  }
  
  void PageOverlay::startFadeAnimation()
  {
      m_fadeAnimationStartTime = currentTime();
      
      // Start the timer
      m_fadeAnimationTimer.startRepeating(1 / fadeAnimationFrameRate);
  }
  
  void PageOverlay::fadeAnimationTimerFired()
  {
      float animationProgress = (currentTime() - m_fadeAnimationStartTime) / m_fadeAnimationDuration;
  
      if (animationProgress >= 1.0)
          animationProgress = 1.0;
  
      double sine = sin(piOverTwoFloat * animationProgress);
      float fadeAnimationValue = sine * sine;
  
      m_fractionFadedIn = (m_fadeAnimationType == FadeInAnimation) ? fadeAnimationValue : 1 - fadeAnimationValue;
      setNeedsDisplay();
  
      if (animationProgress == 1.0) {
          m_fadeAnimationTimer.stop();
  
          bool wasFadingOut = m_fadeAnimationType == FadeOutAnimation;
          m_fadeAnimationType = NoAnimation;
  
          if (wasFadingOut) {
              // If this was a fade out, go ahead and uninstall the page overlay.
              m_webPage->uninstallPageOverlay(this, false);
          }
      }
  }
  
  } // namespace WebKit
  