Get notified every time your widget appears or disappears from the screen.
Similar to onResume()/onPause() on Android and viewDidAppear()/viewDidDisappear() on iOS.
Focus Detector fires callbacks for you whenever something happens to take or give your widget focus. Such an event might be, for instance, the user:
- Navigating to/from another screen;
- Turning the device’s screen on/off while your widget is visible;
- Switching to/from another app while your widget is visible;
- Scrolling your widget in/out the screen;
@overrideWidgetbuild(BuildContext context) =>FocusDetector( onFocusLost: (){logger.i( 'Focus Lost.''\nTriggered when either [onVisibilityLost] or [onForegroundLost] ''is called.''\nEquivalent to onPause() on Android or viewDidDisappear() on iOS.', )}, onFocusGained: (){logger.i( 'Focus Gained.''\nTriggered when either [onVisibilityGained] or [onForegroundGained] ''is called.''\nEquivalent to onResume() on Android or viewDidAppear() on iOS.', )}, onVisibilityLost: (){logger.i( 'Visibility Lost.''\nIt means the widget is no longer visible within your app.', )}, onVisibilityGained: (){logger.i( 'Visibility Gained.''\nIt means the widget is now visible within your app.', )}, onForegroundLost: (){logger.i( 'Foreground Lost.''\nIt means, for example, that the user sent your app to the background by opening ''another app or turned off the device\'s screen while your ''widget was visible.', )}, onForegroundGained: (){logger.i( 'Foreground Gained.''\nIt means, for example, that the user switched back to your app or turned the ''device\'s screen back on while your widget was visible.', )}, child:Container(), );- Turn on and off resource-consuming features, such as camera, location or bluetooth;
- Sync your data with a remote API or local database;
- Pause and resume video/audio playback or streaming;
For a sample with more than one screen, please check out the focus-detector/set-state-focus-detector or focus-detector/bloc-focus-detector branches from the Breaking Bapp repository.