gradients-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 <dali-toolkit/dali-toolkit.h>
#include "shared/view.h"
using namespace Dali;
using namespace Dali::Toolkit;
namespace
{
const char * const APPLICATION_TITLE( "Color Gradients" );
const char * const TOOLBAR_IMAGE( DEMO_IMAGE_DIR "top-bar.png" );
const char * const CHANGE_ICON( DEMO_IMAGE_DIR "icon-change.png" );
const char * const CHANGE_ICON_SELECTED( DEMO_IMAGE_DIR "icon-change-selected.png" );
}
// This example shows how to render color gradients
//
class GradientController : public ConnectionTracker
{
public:
GradientController( Application& application )
: mApplication( application ),
mIndex( 0 )
{
// Connect to the Application's Init signal
mApplication.InitSignal().Connect( this, &GradientController::Create );
}
~GradientController()
{
// Nothing to do here;
}
// The Init signal is received once (only) during the Application lifetime
void Create( Application& application )
{
// Get a handle to the stage
Stage stage = Stage::GetCurrent();
stage.KeyEventSignal().Connect(this, &GradientController::OnKeyEvent);
// Creates a default view with a default tool bar.
// The view is added to the stage.
Toolkit::ToolBar toolBar;
Layer content = DemoHelper::CreateView( application,
mView,
toolBar,
"",
TOOLBAR_IMAGE,
APPLICATION_TITLE );
PushButton changeButton = Toolkit::PushButton::New();
changeButton.SetProperty( Toolkit::Button::Property::UNSELECTED_BACKGROUND_VISUAL, CHANGE_ICON );
changeButton.SetProperty( Toolkit::Button::Property::SELECTED_BACKGROUND_VISUAL, CHANGE_ICON_SELECTED );
changeButton.ClickedSignal().Connect( this, &GradientController::OnChangeIconClicked );
toolBar.AddControl( changeButton,
DemoHelper::DEFAULT_VIEW_STYLE.mToolBarButtonPercentage,
Toolkit::Alignment::HorizontalRight,
DemoHelper::DEFAULT_MODE_SWITCH_PADDING );
// ---- Gradient for background
mGradientMap.Insert( Toolkit::Visual::Property::TYPE, Visual::GRADIENT );
Property::Array stopOffsets;
stopOffsets.PushBack( 0.0f );
stopOffsets.PushBack( 0.3f );
stopOffsets.PushBack( 0.6f );
stopOffsets.PushBack( 0.8f );
stopOffsets.PushBack( 1.0f );
mGradientMap.Insert( GradientVisual::Property::STOP_OFFSET, stopOffsets );
Property::Array stopColors;
stopColors.PushBack( Vector4( 129.f, 198.f, 193.f, 255.f )/255.f );
stopColors.PushBack( Vector4( 196.f, 198.f, 71.f, 122.f )/255.f );
stopColors.PushBack( Vector4( 214.f, 37.f, 139.f, 191.f )/255.f );
stopColors.PushBack( Vector4( 129.f, 198.f, 193.f, 150.f )/255.f );
stopColors.PushBack( Color::YELLOW );
mGradientMap.Insert( GradientVisual::Property::STOP_COLOR, stopColors );
OnChangeIconClicked( changeButton );
}
bool OnChangeIconClicked( Toolkit::Button button )
{
Property::Map gradientMap;
switch( mIndex%4 )
{
case 0: // linear gradient with units as objectBoundingBox
{
gradientMap.Insert( GradientVisual::Property::START_POSITION, Vector2( 0.5f, 0.5f ) );
gradientMap.Insert( GradientVisual::Property::END_POSITION, Vector2( -0.5f, -0.5f ) );
break;
}
case 1: // linear gradient with units as userSpaceOnUse
{
Vector2 halfStageSize = Stage::GetCurrent().GetSize()*0.5f;
gradientMap.Insert( GradientVisual::Property::START_POSITION, halfStageSize );
gradientMap.Insert( GradientVisual::Property::END_POSITION, -halfStageSize );
gradientMap.Insert( GradientVisual::Property::UNITS, GradientVisual::Units::USER_SPACE );
break;
}
case 2: // radial gradient with units as objectBoundingBox
{
gradientMap.Insert( GradientVisual::Property::CENTER, Vector2( 0.5f, 0.5f ) );
gradientMap.Insert( GradientVisual::Property::RADIUS, 1.414f );
break;
}
default: // radial gradient with units as userSpaceOnUse
{
Vector2 stageSize = Stage::GetCurrent().GetSize();
gradientMap.Insert( GradientVisual::Property::CENTER, stageSize * 0.5f );
gradientMap.Insert( GradientVisual::Property::RADIUS, stageSize.Length());
gradientMap.Insert( GradientVisual::Property::UNITS, GradientVisual::Units::USER_SPACE );
break;
}
}
gradientMap.Merge( mGradientMap );
mView.SetProperty( Control::Property::BACKGROUND, gradientMap );
mIndex++;
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;
Property::Map mGradientMap;
Control mView;
unsigned mIndex;
};
int DALI_EXPORT_API main( int argc, char **argv )
{
Application application = Application::New( &argc, &argv );
GradientController test( application );
application.MainLoop();
return 0;
}