gaussian-blur-view-example.cpp
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/*
* Copyright (c) 2019 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <algorithm>
#include <dali-toolkit/dali-toolkit.h>
#include <dali-toolkit/devel-api/controls/gaussian-blur-view/gaussian-blur-view.h>
using namespace Dali;
using Dali::Toolkit::TextLabel;
using Dali::Toolkit::GaussianBlurView;
namespace
{
const char* const BACKGROUND_IMAGE( DEMO_IMAGE_DIR "lake_front.jpg" );
const float BACKGROUND_IMAGE_WIDTH = 2048.0f;
}
/**
* This example shows a scrolling background image which can be blurred (on/off) by tapping the screen
*/
class GaussianBlurViewExample : public ConnectionTracker
{
public:
GaussianBlurViewExample( Application& application )
: mApplication( application ),
mExcessWidth( 0.0f ),
mStrength( 1.0f )
{
mApplication.InitSignal().Connect( this, &GaussianBlurViewExample::Create );
}
~GaussianBlurViewExample() = default;
private:
void Create( Application& application )
{
Stage stage = Stage::GetCurrent();
Vector2 stageSize = stage.GetSize();
stage.KeyEventSignal().Connect(this, &GaussianBlurViewExample::OnKeyEvent);
mImageView = Toolkit::ImageView::New( BACKGROUND_IMAGE );
mImageView.SetParentOrigin( ParentOrigin::CENTER );
mImageView.SetAnchorPoint( AnchorPoint::CENTER );
stage.Add( mImageView );
float excessWidth = std::max( 0.0f, (BACKGROUND_IMAGE_WIDTH - stageSize.width) * 0.5f );
if( excessWidth > 0.0f )
{
// Move background image to show GaussianBlurView activity
float pixelsPerSecond = 10.0f;
float duration = excessWidth / pixelsPerSecond;
float qDuration = duration * 0.25f;
mAnimation = Animation::New( duration );
mAnimation.AnimateTo( Property(mImageView, Actor::Property::POSITION_X), excessWidth, TimePeriod(0.0f , qDuration) );
mAnimation.AnimateTo( Property(mImageView, Actor::Property::POSITION_X), 0.0f, TimePeriod(qDuration , qDuration) );
mAnimation.AnimateTo( Property(mImageView, Actor::Property::POSITION_X), -excessWidth, TimePeriod(2.0f*qDuration, qDuration) );
mAnimation.AnimateTo( Property(mImageView, Actor::Property::POSITION_X), 0.0f, TimePeriod(3.0f*qDuration, qDuration) );
mAnimation.SetLooping( true );
mAnimation.Play();
}
Layer onTop = Layer::New();
onTop.SetParentOrigin( ParentOrigin::CENTER );
onTop.SetAnchorPoint( AnchorPoint::CENTER );
onTop.SetSize( stageSize );
stage.Add( onTop );
onTop.RaiseToTop();
mOnLabel = TextLabel::New( "Blur ON" );
mOnLabel.SetAnchorPoint( AnchorPoint::TOP_LEFT );
mOnLabel.SetProperty( TextLabel::Property::TEXT_COLOR, Color::GREEN );
mOnLabel.SetVisible( false );
onTop.Add( mOnLabel );
mOffLabel = TextLabel::New( "Blur OFF" );
mOffLabel.SetAnchorPoint( AnchorPoint::TOP_LEFT );
mOffLabel.SetProperty( TextLabel::Property::TEXT_COLOR, Color::WHITE );
mOffLabel.SetVisible( true );
onTop.Add( mOffLabel );
stage.GetRootLayer().TouchSignal().Connect( this, &GaussianBlurViewExample::OnTouch );
}
bool OnTouch( Actor actor, const TouchData& touch )
{
const PointState::Type state = touch.GetState( 0 );
if( PointState::DOWN == state )
{
Stage stage = Stage::GetCurrent();
// Enable/disable blur effect
if( !mGaussianBlurView )
{
mGaussianBlurView = GaussianBlurView::New( 30, 8.0f, Pixel::RGBA8888, 0.5f, 0.5f, false );
mGaussianBlurView.SetParentOrigin( ParentOrigin::CENTER );
mGaussianBlurView.SetAnchorPoint( AnchorPoint::CENTER );
mGaussianBlurView.SetSize( stage.GetSize() );
stage.Add( mGaussianBlurView );
mGaussianBlurView.Add( mImageView );
mGaussianBlurView.Activate();
mGaussianBlurView.SetProperty( mGaussianBlurView.GetBlurStrengthPropertyIndex(), mStrength );
mOnLabel.SetVisible( true );
mOffLabel.SetVisible( false );
}
else
{
stage.Add( mImageView );
UnparentAndReset( mGaussianBlurView );
mOnLabel.SetVisible( false );
mOffLabel.SetVisible( true );
}
}
return true;
}
void OnKeyEvent(const KeyEvent& event)
{
if(event.state == KeyEvent::Down)
{
if( IsKey( event, Dali::DALI_KEY_ESCAPE) || IsKey( event, Dali::DALI_KEY_BACK) )
{
mApplication.Quit();
}
}
}
private:
Application& mApplication;
Toolkit::ImageView mImageView;
Animation mAnimation;
TextLabel mOnLabel;
TextLabel mOffLabel;
GaussianBlurView mGaussianBlurView;
float mExcessWidth;
float mStrength;
};
int DALI_EXPORT_API main( int argc, char **argv )
{
Application application = Application::New( &argc, &argv );
GaussianBlurViewExample test( application );
application.MainLoop();
return 0;
}