2 * Copyright (c) 2017 Samsung Electronics Co., Ltd.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 #include <dali/devel-api/actors/actor-devel.h>
19 #include <dali-toolkit/dali-toolkit.h>
22 using namespace Dali::Toolkit;
26 const float COLOR_ANIMATION_DURATION( 5.0f );
27 const float OPACITY_ANIMATION_DURATION( 1.0f );
28 } // unnamed namespace
31 * @brief An example that shows how to use property notifications.
33 * - Creates a text label and sets its text color to black.
34 * - Animates the text color of a text label to red.
35 * - Sets up a property notification so that we are informed when the color is 50% red.
36 * - When we are notified, we start a new animation which animates the text label to transparent.
38 class PropertyNotificationController : public ConnectionTracker
44 * @param[in] application A reference to the Application class.
46 PropertyNotificationController( Application& application )
47 : mApplication( application )
49 // Connect to the Application's Init signal
50 mApplication.InitSignal().Connect( this, &PropertyNotificationController::Create );
54 * @brief Called to initialise the application content
55 * @param[in] application A reference to the Application class.
57 void Create( Application& application )
59 // Set the stage background color and connect to the stage's key signal to allow Back and Escape to exit.
60 Stage stage = Stage::GetCurrent();
61 stage.SetBackgroundColor( Color::WHITE );
62 stage.KeyEventSignal().Connect( this, &PropertyNotificationController::OnKeyEvent );
64 // Create a text label and set the text color to black
65 mTextLabel = TextLabel::New( "Black to Red Animation\nNew opacity animation at 50% Red" );
66 mTextLabel.SetProperty( Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER );
67 mTextLabel.SetProperty( Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER );
68 mTextLabel.SetProperty( TextLabel::Property::MULTI_LINE, true );
69 mTextLabel.SetProperty( TextLabel::Property::HORIZONTAL_ALIGNMENT, "CENTER" );
70 mTextLabel.SetProperty( TextLabel::Property::TEXT_COLOR, Color::BLACK );
71 stage.Add( mTextLabel );
73 // Create an animation and animate the text color to red
74 Animation animation = Animation::New( COLOR_ANIMATION_DURATION );
75 animation.AnimateTo( Property( mTextLabel, TextLabel::Property::TEXT_COLOR ), Color::RED );
78 // Set up a property notification so we are notified when the red component of the text-color reaches 50%
79 PropertyNotification notification = mTextLabel.AddPropertyNotification( TextLabel::Property::TEXT_COLOR_RED, GreaterThanCondition( 0.5f ) );
80 notification.NotifySignal().Connect( this, &PropertyNotificationController::RedComponentNotification );
84 * @brief Called when any key event is received
86 * Will use this to quit the application if Back or the Escape key is received
87 * @param[in] event The key event information
89 void OnKeyEvent( const KeyEvent& event )
91 if( event.state == KeyEvent::Down )
93 if ( IsKey( event, Dali::DALI_KEY_ESCAPE ) || IsKey( event, Dali::DALI_KEY_BACK ) )
101 * @brief Called when the property notification condition is met.
103 * In our case, it's when the red component is greater than 50%.
104 * Will use this notification to animate the opacity of the text-label to transparent.
106 void RedComponentNotification( PropertyNotification& /* source */ )
108 Animation animation = Animation::New( OPACITY_ANIMATION_DURATION );
109 animation.AnimateTo( Property( mTextLabel, DevelActor::Property::OPACITY ), 0.0f );
114 Application& mApplication;
115 TextLabel mTextLabel;
118 int DALI_EXPORT_API main( int argc, char **argv )
120 Application application = Application::New( &argc, &argv );
121 PropertyNotificationController test( application );
122 application.MainLoop();