// signal handler, called when the pan gesture is detected
void DissolveEffectApp::OnPanGesture( Actor actor, const PanGesture& gesture )
{
  // does not response when the animation has not finished
  if( mIsTransiting || mSlideshow )
  {
    return;
  }

  if( gesture.state == Gesture::Continuing )
  {
    if( gesture.displacement.x < 0)
    {
      mIndex = (mIndex + 1)%NUM_IMAGES;
    }
    else
    {
      mIndex = (mIndex + NUM_IMAGES -1)%NUM_IMAGES;
    }

    mNextImage = CreateStageFillingImageView( IMAGES[ mIndex ] );
    mNextImage.SetParentOrigin( ParentOrigin::CENTER );
    mNextImage.SetResizePolicy( ResizePolicy::FILL_TO_PARENT, Dimension::ALL_DIMENSIONS );
    mNextImage.SetSizeScalePolicy( SizeScalePolicy::FIT_WITH_ASPECT_RATIO );
    mNextImage.SetZ(INITIAL_DEPTH);
    mParent.Add( mNextImage );
    Vector2 size = Vector2( mCurrentImage.GetCurrentSize() );
    StartTransition( gesture.position / size, gesture.displacement * Vector2(1.0, size.x/size.y));
  }
}
void DissolveEffectApp::OnInit( Application& application )
{
  Stage::GetCurrent().KeyEventSignal().Connect(this, &DissolveEffectApp::OnKeyEvent);

  // Creates a default view with a default tool bar, the view is added to the stage.
  mContent = DemoHelper::CreateView( application, mView,mToolBar, "", TOOLBAR_IMAGE, "" );

  // Add an effect-changing button on the right of the tool bar.
  mEffectChangeButton = Toolkit::PushButton::New();
  mEffectChangeButton.SetProperty( Toolkit::Button::Property::UNSELECTED_STATE_IMAGE, EFFECT_HIGHP_IMAGE );
  mEffectChangeButton.SetProperty( Toolkit::Button::Property::SELECTED_STATE_IMAGE, EFFECT_HIGHP_IMAGE_SELECTED );
  mEffectChangeButton.ClickedSignal().Connect( this, &DissolveEffectApp::OnEffectButtonClicked );
  mToolBar.AddControl( mEffectChangeButton, DemoHelper::DEFAULT_VIEW_STYLE.mToolBarButtonPercentage, Toolkit::Alignment::HorizontalRight, DemoHelper::DEFAULT_MODE_SWITCH_PADDING );

  // Add title to the tool bar.
  mTitleActor = DemoHelper::CreateToolBarLabel( APPLICATION_TITLE_HIGHP );
  mToolBar.AddControl( mTitleActor, DemoHelper::DEFAULT_VIEW_STYLE.mToolBarTitlePercentage, Toolkit::Alignment::HorizontalCenter );

  // Add an slide-show button on the right of the title
  mPlayStopButton = Toolkit::PushButton::New();
  mPlayStopButton.SetProperty( Toolkit::Button::Property::UNSELECTED_STATE_IMAGE, PLAY_ICON );
  mPlayStopButton.SetProperty( Toolkit::Button::Property::SELECTED_STATE_IMAGE, PLAY_ICON_SELECTED );
  mPlayStopButton.ClickedSignal().Connect( this, &DissolveEffectApp::OnSildeshowButtonClicked );
  mToolBar.AddControl( mPlayStopButton, DemoHelper::DEFAULT_VIEW_STYLE.mToolBarButtonPercentage, Toolkit::Alignment::HorizontalCenter, DemoHelper::DEFAULT_PLAY_PADDING );

  // use pan gesture to detect the cursor or finger movement
  mPanGestureDetector = PanGestureDetector::New();
  mPanGestureDetector.DetectedSignal().Connect( this, &DissolveEffectApp::OnPanGesture );

  mViewTimer = Timer::New( VIEWINGTIME );
  mViewTimer.TickSignal().Connect( this, &DissolveEffectApp::OnTimerTick );
  mTimerReady = true;

  // Set size to stage size to avoid seeing a black border on transition
  mParent = Actor::New();
  mParent.SetSize( Stage::GetCurrent().GetSize() );
  mParent.SetParentOrigin( ParentOrigin::CENTER );
  mContent.Add( mParent );

  // show the first image
  mCurrentImage = CreateStageFillingImageView( IMAGES[mIndex] );
  mCurrentImage.SetParentOrigin( ParentOrigin::CENTER );
  mCurrentImage.SetResizePolicy( ResizePolicy::FILL_TO_PARENT, Dimension::ALL_DIMENSIONS );
  mCurrentImage.SetSizeScalePolicy( SizeScalePolicy::FIT_WITH_ASPECT_RATIO );
  mParent.Add( mCurrentImage );

  mPanGestureDetector.Attach( mCurrentImage );

  mDissolveEffect = Dali::Toolkit::CreateDissolveEffect( mUseHighPrecision );
  Property::Map emptyShaderMap;
  mEmptyEffect.Insert( "shader", emptyShaderMap );
}
bool DissolveEffectApp::OnTimerTick()
{
  mTimerReady = true;
  if(mSlideshow)
  {
    mIndex = (mIndex + 1)%NUM_IMAGES;
    mNextImage = CreateStageFillingImageView( IMAGES[ mIndex ] );
    mNextImage.SetParentOrigin( ParentOrigin::CENTER );
    mNextImage.SetResizePolicy( ResizePolicy::FILL_TO_PARENT, Dimension::ALL_DIMENSIONS );
    mNextImage.SetSizeScalePolicy( SizeScalePolicy::FIT_WITH_ASPECT_RATIO );
    mNextImage.SetZ(INITIAL_DEPTH);
    mParent.Add( mNextImage );
    switch( mCentralLineIndex%4 )
    {
      case 0:
      {
        StartTransition(Vector2(1.0f,0.5f), Vector2(-1.0f, 0.0f));
        break;
      }
      case 1:
      {
        StartTransition(Vector2(0.5f,0.0f), Vector2(0.0f, 1.0f));
        break;
      }
      case 2:
      {
        StartTransition(Vector2(0.0f,0.5f), Vector2(1.0f, 0.0f));
        break;
      }
      default:
      {
        StartTransition(Vector2(0.5f,1.0f), Vector2(0.0f, -1.0f));
        break;
      }

    }
    mCentralLineIndex++;
  }
  return false;   //return false to stop the timer
}