2 * Copyright (c) 2020 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.
19 #include <dali-toolkit/dali-toolkit.h>
20 #include <dali/devel-api/common/stage-devel.h>
23 #include "frame-callback.h"
26 using namespace Dali::Toolkit;
30 const char * IMAGE_NAME = DEMO_IMAGE_DIR "application-icon-1.png";
32 const char * TEXT_ENABLED( "FrameCallback: ON" );
33 const char * TEXT_DISABLED( "FrameCallback: OFF" );
34 Vector4 TEXT_COLOR_ENABLED( Color::BLACK );
35 Vector4 TEXT_COLOR_DISABLED( Color::RED );
37 float ANIMATION_TIME( 4.0f );
38 float ANIMATION_PROGRESS_MULTIPLIER( 0.02f );
39 } // unnamed namespace
42 * @brief An example of how to set/unset the FrameCallbackInterface in DALi.
44 * Creates a scene with several image-views which are animated from side-to-side.
45 * With the frame-callback enabled, the image-views' sizes expand as they hits the sides and the opacity
46 * changes to transparent as they go to the middle.
48 class FrameCallbackController : public ConnectionTracker
54 * @param[in] application The application.
56 FrameCallbackController( Application& application )
57 : mApplication( application ),
61 mFrameCallbackEnabled( false )
63 // Connect to the Application's Init signal
64 mApplication.InitSignal().Connect( this, &FrameCallbackController::Create );
70 * @brief Creates the scene.
72 * Creates several image-views and places them appropriately.
73 * Animate all image-views.
74 * Set the FrameCallbackInterface on the window.
75 * Tapping on the window enables/disables the FrameCallback.
77 void Create( Application& application )
79 // Set the window background color and connect to the window's key signal to allow Back and Escape to exit.
80 Window window = application.GetWindow();
81 window.SetBackgroundColor( Color::WHITE );
82 window.KeyEventSignal().Connect( this, &FrameCallbackController::OnKeyEvent );
84 // Notify mFrameCallback about the window width.
85 // Can call methods in mFrameCallback directly as we have not set it on the window yet.
86 Vector2 windowSize = window.GetSize();
87 mFrameCallback.SetWindowWidth( windowSize.width );
89 // Detect taps on the root layer.
90 mTapDetector = TapGestureDetector::New();
91 mTapDetector.Attach( window.GetRootLayer() );
92 mTapDetector.DetectedSignal().Connect( this, &FrameCallbackController::OnTap );
94 // Create some key-frames to be used by all animations.
95 KeyFrames keyFrames = KeyFrames::New();
96 keyFrames.Add( 0.0f, 0.0f );
97 keyFrames.Add( 0.25f, windowSize.width * 0.5f );
98 keyFrames.Add( 0.75f, -windowSize.width * 0.5f );
99 keyFrames.Add( 1.0f, 0.0f );
102 for( int i = 0; yPos < windowSize.height; ++i )
104 ImageView imageView = ImageView::New( IMAGE_NAME );
105 imageView.SetProperty( Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_CENTER );
106 imageView.SetProperty( Actor::Property::PARENT_ORIGIN, ParentOrigin::TOP_CENTER );
107 imageView.SetProperty( Actor::Property::POSITION_Y, yPos );
108 yPos += imageView.GetNaturalSize().height;
110 // Add the ID of the created ImageView to mFrameCallback.
111 // Again, can call methods in mFrameCallback directly as we have not set it on the window yet.
112 mFrameCallback.AddId( imageView.GetProperty< int >( Actor::Property::ID ) );
114 window.Add( imageView );
116 // Create an animation and set the progress so that each image starts at a different point.
117 Animation animation = Animation::New( ANIMATION_TIME );
118 animation.SetLooping( true );
119 animation.AnimateBetween( Property( imageView, Actor::Property::POSITION_X ), keyFrames );
120 animation.SetCurrentProgress( std::min( 1.0f, ANIMATION_PROGRESS_MULTIPLIER * i ) );
124 // Create a text-label to display whether the FrameCallback is enabled/disabled.
125 mTextLabel = TextLabel::New( TEXT_ENABLED );
126 mTextLabel.SetProperty( TextLabel::Property::TEXT_COLOR, TEXT_COLOR_ENABLED );
127 mTextLabel.SetProperty( TextLabel::Property::HORIZONTAL_ALIGNMENT, "CENTER" );
128 mTextLabel.SetProperty( Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER );
129 mTextLabel.SetProperty( Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER );
130 window.Add( mTextLabel );
132 // Set the FrameCallbackInterface on the root layer.
133 DevelStage::AddFrameCallback( Stage::GetCurrent(), mFrameCallback, window.GetRootLayer() );
134 mFrameCallbackEnabled = true;
138 * @brief Called when a tap on the window occurs.
140 * Toggle enabling/disabling of the FrameCallbackInterface
142 void OnTap( Actor actor, const TapGesture& /* tap */ )
144 if( mFrameCallbackEnabled )
146 DevelStage::RemoveFrameCallback( Stage::GetCurrent(), mFrameCallback );
147 mTextLabel.SetProperty( TextLabel::Property::TEXT, TEXT_DISABLED );
148 mTextLabel.SetProperty( TextLabel::Property::TEXT_COLOR, TEXT_COLOR_DISABLED );
152 DevelStage::AddFrameCallback( Stage::GetCurrent(), mFrameCallback, actor );
153 mTextLabel.SetProperty( TextLabel::Property::TEXT, TEXT_ENABLED );
154 mTextLabel.SetProperty( TextLabel::Property::TEXT_COLOR, TEXT_COLOR_ENABLED );
157 mFrameCallbackEnabled = !mFrameCallbackEnabled;
161 * @brief Called when any key event is received
163 * Will use this to quit the application if Back or the Escape key is received
164 * @param[in] event The key event information
166 void OnKeyEvent( const KeyEvent& event )
168 if( event.state == KeyEvent::Down )
170 if ( IsKey( event, Dali::DALI_KEY_ESCAPE ) || IsKey( event, Dali::DALI_KEY_BACK ) )
178 Application& mApplication; ///< A reference to the application instance.
179 FrameCallback mFrameCallback; ///< An instance of our implementation of the FrameCallbackInterface.
180 TextLabel mTextLabel; ///< Text label which shows whether the frame-callback is enabled/disabled.
181 TapGestureDetector mTapDetector; ///< Tap detector to enable/disable the FrameCallbackInterface.
182 bool mFrameCallbackEnabled; ///< Stores whether the FrameCallbackInterface is enabled/disabled.
185 int DALI_EXPORT_API main( int argc, char **argv )
187 Application application = Application::New( &argc, &argv );
188 FrameCallbackController controller( application );
189 application.MainLoop();