164 lines
4.7 KiB
Markdown
164 lines
4.7 KiB
Markdown
# systemPreferences
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> Get system preferences.
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```javascript
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const {systemPreferences} = require('electron')
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console.log(systemPreferences.isDarkMode())
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```
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## Events
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The `systemPreferences` object emits the following events:
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### Event: 'accent-color-changed' _Windows_
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Returns:
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* `event` Event
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* `newColor` String - The new RGBA color the user assigned to be there system
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accent color.
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### Event: 'inverted-color-scheme-changed' _Windows_
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Returns:
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* `event` Event
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* `invertedColorScheme` Boolean - `true` if an inverted color scheme, such as
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a high contrast theme, is being used, `false` otherwise.
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## Methods
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### `systemPreferences.isDarkMode()` _macOS_
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Returns `Boolean` - Whether the system is in Dark Mode.
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### `systemPreferences.isSwipeTrackingFromScrollEventsEnabled()` _macOS_
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Returns `Boolean` - Whether the Swipe between pages setting is on.
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### `systemPreferences.postNotification(event, userInfo)` _macOS_
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* `event` String
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* `userInfo` Object
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Posts `event` as native notifications of macOS. The `userInfo` is an Object
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that contains the user information dictionary sent along with the notification.
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### `systemPreferences.postLocalNotification(event, userInfo)` _macOS_
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* `event` String
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* `userInfo` Object
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Posts `event` as native notifications of macOS. The `userInfo` is an Object
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that contains the user information dictionary sent along with the notification.
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### `systemPreferences.subscribeNotification(event, callback)` _macOS_
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* `event` String
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* `callback` Function
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Subscribes to native notifications of macOS, `callback` will be called with
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`callback(event, userInfo)` when the corresponding `event` happens. The
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`userInfo` is an Object that contains the user information dictionary sent
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along with the notification.
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The `id` of the subscriber is returned, which can be used to unsubscribe the
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`event`.
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Under the hood this API subscribes to `NSDistributedNotificationCenter`,
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example values of `event` are:
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* `AppleInterfaceThemeChangedNotification`
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* `AppleAquaColorVariantChanged`
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* `AppleColorPreferencesChangedNotification`
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* `AppleShowScrollBarsSettingChanged`
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### `systemPreferences.unsubscribeNotification(id)` _macOS_
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* `id` Integer
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Removes the subscriber with `id`.
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### `systemPreferences.subscribeLocalNotification(event, callback)` _macOS_
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* `event` String
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* `callback` Function
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Same as `subscribeNotification`, but uses `NSNotificationCenter` for local defaults.
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This is necessary for events such as `NSUserDefaultsDidChangeNotification`
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### `systemPreferences.unsubscribeLocalNotification(id)` _macOS_
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* `id` Integer
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Same as `unsubscribeNotification`, but removes the subscriber from `NSNotificationCenter`.
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### `systemPreferences.getUserDefault(key, type)` _macOS_
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* `key` String
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* `type` String - Can be `string`, `boolean`, `integer`, `float`, `double`,
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`url`, `array`, `dictionary`
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Get the value of `key` in system preferences.
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This API reads from `NSUserDefaults` on macOS, some popular `key` and `type`s
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are:
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* `AppleInterfaceStyle: string`
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* `AppleAquaColorVariant: integer`
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* `AppleHighlightColor: string`
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* `AppleShowScrollBars: string`
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* `NSNavRecentPlaces: array`
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* `NSPreferredWebServices: dictionary`
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* `NSUserDictionaryReplacementItems: array`
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### `systemPreferences.isAeroGlassEnabled()` _Windows_
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This method returns `true` if [DWM composition][dwm-composition] (Aero Glass) is
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enabled, and `false` otherwise.
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An example of using it to determine if you should create a transparent window or
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not (transparent windows won't work correctly when DWM composition is disabled):
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```javascript
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const {BrowserWindow, systemPreferences} = require('electron')
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let browserOptions = {width: 1000, height: 800}
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// Make the window transparent only if the platform supports it.
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if (process.platform !== 'win32' || systemPreferences.isAeroGlassEnabled()) {
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browserOptions.transparent = true
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browserOptions.frame = false
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}
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// Create the window.
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let win = new BrowserWindow(browserOptions)
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// Navigate.
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if (browserOptions.transparent) {
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win.loadURL(`file://${__dirname}/index.html`)
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} else {
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// No transparency, so we load a fallback that uses basic styles.
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win.loadURL(`file://${__dirname}/fallback.html`)
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}
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```
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[dwm-composition]:https://msdn.microsoft.com/en-us/library/windows/desktop/aa969540.aspx
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### `systemPreferences.getAccentColor()` _Windows_
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Returns the users current system wide color preference in the form of an RGBA
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hexadecimal string.
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```js
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const color = systemPreferences.getAccentColor() // `"aabbccdd"`
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const red = color.substr(0, 2) // "aa"
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const green = color.substr(2, 2) // "bb"
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const blue = color.substr(4, 2) // "cc"
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const alpha = color.substr(6, 2) // "dd"
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```
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### `systemPreferences.isInvertedColorScheme()` _Windows_
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Returns `Boolean` - `true` if an inverted color scheme, such as a high contrast
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theme, is active, `false` otherwise.
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