Class: Gio::AppInfoMonitor
- Inherits:
-
Object
- Object
- Gio::AppInfoMonitor
- Defined in:
- (unknown)
Overview
GAppInfoMonitor monitors application information for changes.
GAppInfoMonitor is a very simple object used for monitoring the app
info database for changes (newly installed or removed applications).
Call [funcGio.AppInfoMonitor.get] to get a GAppInfoMonitor and connect
to the [signalGio.AppInfoMonitor::changed] signal. The signal will be emitted once when
the app info database changes, and will not be emitted again until after the
next call to [funcGio.AppInfo.get_all] or another g_app_info_*() function.
This is because monitoring the app info database for changes is expensive.
The following functions will re-arm the [signalGio.AppInfoMonitor::changed] signal so it can be emitted again:
- [funcGio.AppInfo.get_all]
- [funcGio.AppInfo.get_all_for_type]
- [funcGio.AppInfo.get_default_for_type]
- [funcGio.AppInfo.get_fallback_for_type]
- [funcGio.AppInfo.get_recommended_for_type]
g_desktop_app_info_get_implementations()g_desktop_app_info_new()g_desktop_app_info_new_from_filename()g_desktop_app_info_new_from_keyfile()g_desktop_app_info_search()
The latter functions are available if using
GDesktopAppInfo from
gio-unix-2.0.pc (GIR namespace GioUnix-2.0).
In the usual case, applications should try to make note of the change
(doing things like invalidating caches) but not act on it. In
particular, applications should avoid making calls to GAppInfo APIs
in response to the change signal, deferring these until the time that
the updated data is actually required. The exception to this case is when
application information is actually being displayed on the screen
(for example, during a search or when the list of all applications is shown).
The reason for this is that changes to the list of installed applications
often come in groups (like during system updates) and rescanning the list
on every change is pointless and expensive.
Class Method Summary collapse
-
.get ⇒ Gio::AppInfoMonitor
Gets the GApp::InfoMonitor for the current thread-default main context.
Class Method Details
.get ⇒ Gio::AppInfoMonitor
Gets the GApp::InfoMonitor for the current thread-default main context.
The GApp::InfoMonitor will emit a "changed" signal in the thread-default main context whenever the list of installed applications (as reported by g_app_info_get_all()) may have changed.
The GApp::InfoMonitor::changed signal will only be emitted once until
g_app_info_get_all() (or another g_app_info_*() function) is called. Doing
so will re-arm the signal ready to notify about the next change.
You must only call g_object_unref() on the return value from under the same main context as you created it.