328 lines
11 KiB
Markdown
328 lines
11 KiB
Markdown
# systemPreferences
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> Get system preferences.
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Process: [Main](../glossary.md#main-process)
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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 their system
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accent color.
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### Event: 'color-changed' _Windows_
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Returns:
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* `event` Event
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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 (a high contrast color scheme with light text and dark backgrounds) is being used, `false` otherwise.
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### Event: 'high-contrast-color-scheme-changed' _Windows_
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Returns:
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* `event` Event
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* `highContrastColorScheme` Boolean - `true` if a high contrast theme is being used, `false` otherwise.
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### Event: 'appearance-changed' _macOS_
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Returns:
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* `newAppearance` String - Can be `dark` or `light`
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**NOTE:** This event is only emitted after you have called `startAppLevelAppearanceTrackingOS`
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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.postWorkspaceNotification(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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* `event` String
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* `userInfo` Object
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Returns `Number` - The ID of this subscription
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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.subscribeLocalNotification(event, callback)` _macOS_
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* `event` String
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* `callback` Function
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* `event` String
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* `userInfo` Object
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Returns `Number` - The ID of this subscription
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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.subscribeWorkspaceNotification(event, callback)` _macOS_
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* `event` String
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* `callback` Function
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* `event` String
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* `userInfo` Object
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Same as `subscribeNotification`, but uses `NSWorkspace.sharedWorkspace.notificationCenter`.
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This is necessary for events such as `NSWorkspaceDidActivateApplicationNotification`.
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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.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.unsubscribeWorkspaceNotification(id)` _macOS_
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* `id` Integer
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Same as `unsubscribeNotification`, but removes the subscriber from `NSWorkspace.sharedWorkspace.notificationCenter`.
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### `systemPreferences.registerDefaults(defaults)` _macOS_
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* `defaults` Object - a dictionary of (`key: value`) user defaults
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Add the specified defaults to your application's `NSUserDefaults`.
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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` or `dictionary`.
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Returns `any` - The value of `key` in `NSUserDefaults`.
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Some popular `key` and `type`s 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.setUserDefault(key, type, value)` _macOS_
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* `key` String
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* `type` String - See [`getUserDefault`](#systempreferencesgetuserdefaultkey-type-macos).
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* `value` String
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Set the value of `key` in `NSUserDefaults`.
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Note that `type` should match actual type of `value`. An exception is thrown
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if they don't.
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Some popular `key` and `type`s are:
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* `ApplePressAndHoldEnabled`: `boolean`
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### `systemPreferences.removeUserDefault(key)` _macOS_
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* `key` String
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Removes the `key` in `NSUserDefaults`. This can be used to restore the default
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or global value of a `key` previously set with `setUserDefault`.
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### `systemPreferences.isAeroGlassEnabled()` _Windows_
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Returns `Boolean` - `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 `String` - The users current system wide accent color preference in RGBA
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hexadecimal form.
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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.getColor(color)` _Windows_
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* `color` String - One of the following values:
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* `3d-dark-shadow` - Dark shadow for three-dimensional display elements.
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* `3d-face` - Face color for three-dimensional display elements and for dialog
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box backgrounds.
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* `3d-highlight` - Highlight color for three-dimensional display elements.
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* `3d-light` - Light color for three-dimensional display elements.
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* `3d-shadow` - Shadow color for three-dimensional display elements.
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* `active-border` - Active window border.
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* `active-caption` - Active window title bar. Specifies the left side color in
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the color gradient of an active window's title bar if the gradient effect is
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enabled.
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* `active-caption-gradient` - Right side color in the color gradient of an
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active window's title bar.
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* `app-workspace` - Background color of multiple document interface (MDI)
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applications.
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* `button-text` - Text on push buttons.
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* `caption-text` - Text in caption, size box, and scroll bar arrow box.
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* `desktop` - Desktop background color.
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* `disabled-text` - Grayed (disabled) text.
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* `highlight` - Item(s) selected in a control.
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* `highlight-text` - Text of item(s) selected in a control.
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* `hotlight` - Color for a hyperlink or hot-tracked item.
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* `inactive-border` - Inactive window border.
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* `inactive-caption` - Inactive window caption. Specifies the left side color
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in the color gradient of an inactive window's title bar if the gradient
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effect is enabled.
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* `inactive-caption-gradient` - Right side color in the color gradient of an
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inactive window's title bar.
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* `inactive-caption-text` - Color of text in an inactive caption.
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* `info-background` - Background color for tooltip controls.
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* `info-text` - Text color for tooltip controls.
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* `menu` - Menu background.
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* `menu-highlight` - The color used to highlight menu items when the menu
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appears as a flat menu.
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* `menubar` - The background color for the menu bar when menus appear as flat
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menus.
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* `menu-text` - Text in menus.
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* `scrollbar` - Scroll bar gray area.
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* `window` - Window background.
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* `window-frame` - Window frame.
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* `window-text` - Text in windows.
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Returns `String` - The system color setting in RGB hexadecimal form (`#ABCDEF`).
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See the [Windows docs][windows-colors] for more details.
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[windows-colors]:https://msdn.microsoft.com/en-us/library/windows/desktop/ms724371(v=vs.85).aspx
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### `systemPreferences.isInvertedColorScheme()` _Windows_
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Returns `Boolean` - `true` if an inverted color scheme (a high contrast color scheme with light text and dark backgrounds) is active, `false` otherwise.
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### `systemPreferences.isHighContrastColorScheme()` _Windows_
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Returns `Boolean` - `true` if a high contrast theme is active, `false` otherwise.
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### `systemPreferences.getEffectiveAppearance()` _macOS_
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Returns `String` - Can be `dark`, `light` or `unknown`.
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Gets the macOS appearance setting that is currently applied to your application,
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maps to [NSApplication.effectiveAppearance](https://developer.apple.com/documentation/appkit/nsapplication/2967171-effectiveappearance?language=objc)
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Please note that until Electron is built targeting the 10.14 SDK, your application's
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`effectiveAppearance` will default to 'light' and won't inherit the OS preference. In
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the interim in order for your application to inherit the OS preference you must set the
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`NSRequiresAquaSystemAppearance` key in your apps `Info.plist` to `false`. If you are
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using `electron-packager` or `electron-forge` just set the `enableDarwinDarkMode`
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packager option to `true`. See the [Electron Packager API](https://github.com/electron-userland/electron-packager/blob/master/docs/api.md#darwindarkmodesupport)
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for more details.
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### `systemPreferences.getAppLevelAppearance()` _macOS_
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Returns `String` | `null` - Can be `dark`, `light` or `unknown`.
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Gets the macOS appearance setting that you have declared you want for
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your application, maps to [NSApplication.appearance](https://developer.apple.com/documentation/appkit/nsapplication/2967170-appearance?language=objc).
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You can use the `setAppLevelAppearance` API to set this value.
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### `systemPreferences.setAppLevelAppearance(appearance)` _macOS_
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* `appearance` String | null - Can be `dark` or `light`
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Sets the appearance setting for your application, this should override the
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system default and override the value of `getEffectiveAppearance`.
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