gaussian-blur-view-example.cpp
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/*
* Copyright (c) 2020 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::GaussianBlurView;
using Dali::Toolkit::TextLabel;
namespace
{
const char* const BACKGROUND_IMAGE(DEMO_IMAGE_DIR "lake_front.jpg");
const float BACKGROUND_IMAGE_WIDTH = 2048.0f;
} // namespace
/**
* 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),
mActivate(false)
{
mApplication.InitSignal().Connect(this, &GaussianBlurViewExample::Create);
}
~GaussianBlurViewExample() = default;
private:
void Create(Application& application)
{
auto window = application.GetWindow();
Vector2 windowSize = window.GetSize();
window.KeyEventSignal().Connect(this, &GaussianBlurViewExample::OnKeyEvent);
mImageView = Toolkit::ImageView::New(BACKGROUND_IMAGE);
mImageView.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
mImageView.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER);
float excessWidth = std::max(0.0f, (BACKGROUND_IMAGE_WIDTH - windowSize.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.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
onTop.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER);
onTop.SetProperty(Actor::Property::SIZE, windowSize);
window.Add(onTop);
onTop.RaiseToTop();
mOnLabel = TextLabel::New("Blur ON");
mOnLabel.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
mOnLabel.SetProperty(TextLabel::Property::TEXT_COLOR, Color::GREEN);
mOnLabel.SetProperty(Actor::Property::VISIBLE, false);
onTop.Add(mOnLabel);
mOffLabel = TextLabel::New("Blur OFF");
mOffLabel.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
mOffLabel.SetProperty(TextLabel::Property::TEXT_COLOR, Color::WHITE);
mOffLabel.SetProperty(Actor::Property::VISIBLE, true);
onTop.Add(mOffLabel);
mGaussianBlurView = GaussianBlurView::New(30, 8.0f, Pixel::RGBA8888, 0.5f, 0.5f, false);
mGaussianBlurView.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
mGaussianBlurView.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER);
mGaussianBlurView.SetProperty(Actor::Property::SIZE, windowSize);
window.Add(mGaussianBlurView);
mGaussianBlurView.Add(mImageView);
mGaussianBlurView.SetProperty(mGaussianBlurView.GetBlurStrengthPropertyIndex(), mStrength);
window.GetRootLayer().TouchedSignal().Connect(this, &GaussianBlurViewExample::OnTouch);
}
bool OnTouch(Actor actor, const TouchEvent& touch)
{
const PointState::Type state = touch.GetState(0);
if(PointState::DOWN == state)
{
ToggleBlurState();
}
return true;
}
void ToggleBlurState()
{
if(!mActivate)
{
mActivate = true;
mGaussianBlurView.Activate();
mOnLabel.SetProperty(Actor::Property::VISIBLE, true);
mOffLabel.SetProperty(Actor::Property::VISIBLE, false);
}
else
{
mActivate = false;
mGaussianBlurView.Deactivate();
mOnLabel.SetProperty(Actor::Property::VISIBLE, false);
mOffLabel.SetProperty(Actor::Property::VISIBLE, true);
}
}
void OnKeyEvent(const KeyEvent& event)
{
if(event.GetState() == KeyEvent::DOWN)
{
if(IsKey(event, Dali::DALI_KEY_ESCAPE) || IsKey(event, Dali::DALI_KEY_BACK))
{
mApplication.Quit();
}
else if(!event.GetKeyName().compare("1"))
{
ToggleBlurState();
}
}
}
private:
Application& mApplication;
Toolkit::ImageView mImageView;
Animation mAnimation;
TextLabel mOnLabel;
TextLabel mOffLabel;
GaussianBlurView mGaussianBlurView;
float mExcessWidth;
float mStrength;
bool mActivate;
};
int DALI_EXPORT_API main(int argc, char** argv)
{
Application application = Application::New(&argc, &argv);
GaussianBlurViewExample test(application);
application.MainLoop();
return 0;
}