property-notification-example.cpp
4.45 KB
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/*
* Copyright (c) 2017 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/devel-api/actors/actor-devel.h>
#include <dali-toolkit/dali-toolkit.h>
using namespace Dali;
using namespace Dali::Toolkit;
namespace
{
const float COLOR_ANIMATION_DURATION( 5.0f );
const float OPACITY_ANIMATION_DURATION( 1.0f );
} // unnamed namespace
/**
* @brief An example that shows how to use property notifications.
*
* - Creates a text label and sets its text color to black.
* - Animates the text color of a text label to red.
* - Sets up a property notification so that we are informed when the color is 50% red.
* - When we are notified, we start a new animation which animates the text label to transparent.
*/
class PropertyNotificationController : public ConnectionTracker
{
public:
/**
* @brief Constructor.
* @param[in] application A reference to the Application class.
*/
PropertyNotificationController( Application& application )
: mApplication( application )
{
// Connect to the Application's Init signal
mApplication.InitSignal().Connect( this, &PropertyNotificationController::Create );
}
/**
* @brief Called to initialise the application content
* @param[in] application A reference to the Application class.
*/
void Create( Application& application )
{
// Set the stage background color and connect to the stage's key signal to allow Back and Escape to exit.
Stage stage = Stage::GetCurrent();
stage.SetBackgroundColor( Color::WHITE );
stage.KeyEventSignal().Connect( this, &PropertyNotificationController::OnKeyEvent );
// Create a text label and set the text color to black
mTextLabel = TextLabel::New( "Black to Red Animation\nNew opacity animation at 50% Red" );
mTextLabel.SetProperty( Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER );
mTextLabel.SetProperty( Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER );
mTextLabel.SetProperty( TextLabel::Property::MULTI_LINE, true );
mTextLabel.SetProperty( TextLabel::Property::HORIZONTAL_ALIGNMENT, "CENTER" );
mTextLabel.SetProperty( TextLabel::Property::TEXT_COLOR, Color::BLACK );
stage.Add( mTextLabel );
// Create an animation and animate the text color to red
Animation animation = Animation::New( COLOR_ANIMATION_DURATION );
animation.AnimateTo( Property( mTextLabel, TextLabel::Property::TEXT_COLOR ), Color::RED );
animation.Play();
// Set up a property notification so we are notified when the red component of the text-color reaches 50%
PropertyNotification notification = mTextLabel.AddPropertyNotification( TextLabel::Property::TEXT_COLOR_RED, GreaterThanCondition( 0.5f ) );
notification.NotifySignal().Connect( this, &PropertyNotificationController::RedComponentNotification );
}
/**
* @brief Called when any key event is received
*
* Will use this to quit the application if Back or the Escape key is received
* @param[in] event The key event information
*/
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();
}
}
}
/**
* @brief Called when the property notification condition is met.
*
* In our case, it's when the red component is greater than 50%.
* Will use this notification to animate the opacity of the text-label to transparent.
*/
void RedComponentNotification( PropertyNotification& /* source */ )
{
Animation animation = Animation::New( OPACITY_ANIMATION_DURATION );
animation.AnimateTo( Property( mTextLabel, DevelActor::Property::OPACITY ), 0.0f );
animation.Play();
}
private:
Application& mApplication;
TextLabel mTextLabel;
};
int DALI_EXPORT_API main( int argc, char **argv )
{
Application application = Application::New( &argc, &argv );
PropertyNotificationController test( application );
application.MainLoop();
return 0;
}