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.
18 #include <dali-toolkit/dali-toolkit.h>
19 #include <dali/devel-api/actors/actor-devel.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
43 * @param[in] application A reference to the Application class.
45 PropertyNotificationController(Application& application)
46 : mApplication(application)
48 // Connect to the Application's Init signal
49 mApplication.InitSignal().Connect(this, &PropertyNotificationController::Create);
53 * @brief Called to initialise the application content
54 * @param[in] application A reference to the Application class.
56 void Create(Application& application)
58 // Set the window background color and connect to the window's key signal to allow Back and Escape to exit.
59 Window window = application.GetWindow();
60 window.SetBackgroundColor(Color::WHITE);
61 window.KeyEventSignal().Connect(this, &PropertyNotificationController::OnKeyEvent);
63 // Create a text label and set the text color to black
64 mTextLabel = TextLabel::New("Black to Red Animation\nNew opacity animation at 50% Red");
65 mTextLabel.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER);
66 mTextLabel.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
67 mTextLabel.SetProperty(TextLabel::Property::MULTI_LINE, true);
68 mTextLabel.SetProperty(TextLabel::Property::HORIZONTAL_ALIGNMENT, "CENTER");
69 mTextLabel.SetProperty(TextLabel::Property::TEXT_COLOR, Color::BLACK);
70 window.Add(mTextLabel);
72 // Create an animation and animate the text color to red
73 Animation animation = Animation::New(COLOR_ANIMATION_DURATION);
74 animation.AnimateTo(Property(mTextLabel, TextLabel::Property::TEXT_COLOR), Color::RED);
77 // Set up a property notification so we are notified when the red component of the text-color reaches 50%
78 PropertyNotification notification = mTextLabel.AddPropertyNotification(TextLabel::Property::TEXT_COLOR_RED, GreaterThanCondition(0.5f));
79 notification.NotifySignal().Connect(this, &PropertyNotificationController::RedComponentNotification);
83 * @brief Called when any key event is received
85 * Will use this to quit the application if Back or the Escape key is received
86 * @param[in] event The key event information
88 void OnKeyEvent(const KeyEvent& event)
90 if(event.GetState() == KeyEvent::DOWN)
92 if(IsKey(event, Dali::DALI_KEY_ESCAPE) || IsKey(event, Dali::DALI_KEY_BACK))
100 * @brief Called when the property notification condition is met.
102 * In our case, it's when the red component is greater than 50%.
103 * Will use this notification to animate the opacity of the text-label to transparent.
105 void RedComponentNotification(PropertyNotification& /* source */)
107 Animation animation = Animation::New(OPACITY_ANIMATION_DURATION);
108 animation.AnimateTo(Property(mTextLabel, Actor::Property::OPACITY), 0.0f);
113 Application& mApplication;
114 TextLabel mTextLabel;
117 int DALI_EXPORT_API main(int argc, char** argv)
119 Application application = Application::New(&argc, &argv);
120 PropertyNotificationController test(application);
121 application.MainLoop();