diff options
Diffstat (limited to 'src/qml/qml/qqmlengine.cpp')
| -rw-r--r-- | src/qml/qml/qqmlengine.cpp | 53 |
1 files changed, 45 insertions, 8 deletions
diff --git a/src/qml/qml/qqmlengine.cpp b/src/qml/qml/qqmlengine.cpp index 39c3399917..5b39aba65e 100644 --- a/src/qml/qml/qqmlengine.cpp +++ b/src/qml/qml/qqmlengine.cpp @@ -411,14 +411,50 @@ The following functions are also on the Qt object. \row \li \c application.active \li - This read-only property indicates whether the application is the top-most and focused - application, and the user is able to interact with the application. The property - is false when the application is in the background, the device keylock or screen - saver is active, the screen backlight is turned off, or the global system dialog - is being displayed on top of the application. It can be used for stopping and - pausing animations, timers and active processing of data in order to save device - battery power and free device memory and processor load when the application is not - active. + Deprecated, use Qt.application.state == Qt.ApplicationActive instead. + + \row + \li \c application.state + \li + This read-only property indicates the current state of the application. + + Possible values are: + + \list + \li Qt.ApplicationActive - The application is the top-most and focused application, and the + user is able to interact with the application. + \li Qt.ApplicationInactive - The application is visible or partially visible, but not selected + to be in front, the user cannot interact with the application. + On desktop platforms, this typically means that the user activated + another application. On mobile platforms, it is more common to + enter this state when the OS is interrupting the user with for + example incoming calls, SMS-messages or dialogs. This is usually a + transient state during which the application is paused. The user + may return focus to your application, but most of the time it will + be the first indication that the application is going to be suspended. + While in this state, consider pausing or stopping any activity that + should not continue when the user cannot interact with your + application, such as a video, a game, animations, or sensors. + You should also avoid performing CPU-intensive tasks which might + slow down the application in front. + \li Qt.ApplicationSuspended - The application is suspended and not visible to the user. On + mobile platforms, the application typically enters this state when + the user returns to the home screen or switches to another + application. While in this state, the application should ensure + that the user perceives it as always alive and does not lose his + progress, saving any persistent data. The application should cease + all activities and be prepared for code execution to stop. While + suspended, the application can be killed at any time without + further warnings (for example when low memory forces the OS to purge + suspended applications). + \li Qt.ApplicationHidden - The application is hidden and runs in the background. This is the + normal state for applications that need to do background processing, + like playing music, while the user interacts with other applications. + The application should free up all graphical resources when entering + this state. A Qt Quick application should not usually handle this state + at the QML level. Instead, you should unload the entire UI and reload + the QML files whenever the application becomes active again. + \endlist \row \li \c application.layoutDirection @@ -469,6 +505,7 @@ The following functions are also on the Qt object. Note that when using QML without a QGuiApplication, the following properties will be undefined: \list \li application.active + \li application.state \li application.layoutDirection \endlist */ |