property-notification-example.cpp
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/*
* Copyright (c) 2020 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 <dali/devel-api/actors/actor-devel.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 window background color and connect to the window's key signal to allow Back and Escape to exit.
Window window = application.GetWindow();
window.SetBackgroundColor(Color::WHITE);
window.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);
window.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.GetState() == 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, Actor::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;
}