systemPreferences

获取system preferences.

进程：主进程

const { systemPreferences } = require('electron')
console.log(systemPreferences.isDarkMode())

事件

systemPreferences 对象触发以下事件:

Event: 'accent-color-changed' Windows

返回:

• event Event
• newColor String - 用户指定的新 RGBA 颜色作为系统偏好颜色.

Event: 'color-changed' Windows

返回:

• event Event

Event: 'inverted-color-scheme-changed' Windows Deprecated

返回:

• event Event
• invertedColorScheme Boolean - true if an inverted color scheme (a high contrast color scheme with light text and dark backgrounds) is being used, false otherwise.

Deprecated: Should use the new updated event on the nativeTheme module.

Event: 'high-contrast-color-scheme-changed' Windows Deprecated

返回:

• event Event
• highContrastColorScheme Boolean - true if a high contrast theme is being used, false otherwise.

Deprecated: Should use the new updated event on the nativeTheme module.

方法

systemPreferences.isDarkMode() macOS Windows Deprecated

返回Boolean，表示系统是否处于Dark模式

已废弃： 请使用新的 nativeTheme.shouldUseDarkColors API。

systemPreferences.isSwipeTrackingFromScrollEventsEnabled() macOS

返回值 Boolean - 是否在页面设置之间进行滑动。

systemPreferences.postNotification(event, userInfo[, deliverImmediately]) macOS

• event String
• userInfo Record<String, any>
• deliverImmediately Boolean (optional) - true to post notifications immediately even when the subscribing app is inactive.

Posts event as native notifications of macOS. The userInfo is an Object that contains the user information dictionary sent along with the notification.

systemPreferences.postLocalNotification(event, userInfo) macOS

• event String
• userInfo Record<String, any>

Posts event as native notifications of macOS. The userInfo is an Object that contains the user information dictionary sent along with the notification.

systemPreferences.postWorkspaceNotification(event, userInfo) macOS

• event String
• userInfo Record<String, any>

Posts event as native notifications of macOS. The userInfo is an Object that contains the user information dictionary sent along with the notification.

systemPreferences.subscribeNotification(event, callback) macOS

• event String
• callback Function
  • event String
  • userInfo Record<String, unknown>
  • object String

返回 Number - 此订阅的 ID

订阅macOS的原生通知，当通信的 event</ 0>发生时，将调用 <code>callback(event, userInfo) 。 userInfo是一个Object，它包含随通知一起发送的用户信息字典。 The object is the sender of the notification, and only supports NSString values for now.

返回订阅的 id, 可用于取消该订阅的 event.

在这个API下订阅NSDistributedNotificationCenter， event 的示例值为：

• AppleInterfaceThemeChangedNotification
• AppleAquaColorVariantChanged
• AppleColorPreferencesChangedNotification
• AppleShowScrollBarsSettingChanged

systemPreferences.subscribeLocalNotification(event, callback) macOS

• event String
• callback Function
  • event String
  • userInfo Record<String, unknown>
  • object String

返回 Number - 此订阅的 ID

Same as subscribeNotification, but uses NSNotificationCenter for local defaults. 这对事件 NSUserDefaultsDidChangeNotification 是必需的。

systemPreferences.subscribeWorkspaceNotification(event, callback) macOS

• event String
• callback Function
  • event String
  • userInfo Record<String, unknown>
  • object String

返回 Number - 此订阅的 ID

与 subscribeNotification一样, 但使用NSWorkspace.sharedWorkspace.notificationCenter。 这对事件 NSWorkspaceDidActivateApplicationNotification 是必需的。

systemPreferences.unsubscribeNotification(id) macOS

• id Integer

使用 id 删除订阅。

systemPreferences.unsubscribeLocalNotification(id) macOS

• id Integer

与unsubscribeNotification相同，但将订户从NSNotificationCenter中删除。

systemPreferences.unsubscribeWorkspaceNotification(id) macOS

• id Integer

与 unsubscribeNotification 一样，但是它从 NSWorkspace.sharedWorkspace.notificationCenter 中移除订阅者。

systemPreferences.registerDefaults(defaults) macOS

• defaults Record<String, String | Boolean | Number> - a dictionary of (key: value) user defaults

在应用的NSUserDefaults配置项中添加其它默认设置。

systemPreferences.getUserDefault<Type extends keyof UserDefaultTypes>(key, type) macOS

• key String
• type Type - Can be string, boolean, integer, float, double, url, array or dictionary.

Returns UserDefaultTypes[Type] - The value of key in NSUserDefaults.

常用的 key 和 type 的类型为:

• AppleInterfaceStyle: string
• AppleAquaColorVariant: integer
• AppleHighlightColor: string
• AppleShowScrollBars: string
• NSNavRecentPlaces: array
• NSPreferredWebServices: dictionary
• NSUserDictionaryReplacementItems: array

systemPreferences.setUserDefault(key, type, value) macOS

• key String
• type String - Can be string, boolean, integer, float, double, url, array or dictionary.
• value String

设置 NSUserDefaults 中 key 的值.

请注意， type 应匹配实际类型的 value。 如果他们没有，就会抛出一个异常。

常用的 key 和 type 的类型为:

• ApplePressAndHoldEnabled: boolean

systemPreferences.removeUserDefault(key) macOS

• key String

删除 NSUserDefaults中的 key 。 可以用来恢复默认值或之前用 setUserDefault 为一个 key 设置的全局变量。

systemPreferences.isAeroGlassEnabled() Windows

返回 Boolean - true 如果启用了 DWM composition (Aero Glass), 否则为 false.

使用它来确定是否应创建透明窗口的示例 (当禁用 DWM 组合时, 透明窗口无法正常工作):

const { BrowserWindow, systemPreferences } = require('electron')
const browserOptions = { width: 1000, height: 800 }

// Make the window transparent only if the platform supports it.
if (process.platform !== 'win32' || systemPreferences.isAeroGlassEnabled()) {
  browserOptions.transparent = true
  browserOptions.frame = false
}

// Create the window.
const win = new BrowserWindow(browserOptions)

// Navigate.
if (browserOptions.transparent) {
  win.loadURL(`file://${__dirname}/index.html`)
} else {
  // No transparency, so we load a fallback that uses basic styles.
  win.loadURL(`file://${__dirname}/fallback.html`)
}

systemPreferences.getAccentColor() Windows macOS

返回 String - 用户当前系统偏好颜色，RGBA 十六进制形式.

const color = systemPreferences.getAccentColor() // `"aabbccdd"`
const red = color.substr(0, 2) // "aa"
const green = color.substr(2, 2) // "bb"
const blue = color.substr(4, 2) // "cc"
const alpha = color.substr(6, 2) // "dd"

此 API 仅在 macOS 10.14 Mojave 或更高版本上可用。

systemPreferences.getColor(color) Windows macOS

• color String - One of the following values:
  • On Windows:
    • 3d-dark-shadow - 三维显示元素的暗阴影。
    • 3d-face - 面向三维显示元素和对话框背景的颜色。
    • 3d-highlight - 三维显示元素的高亮色.
    • 3d-light - 三维显示元素的亮色.
    • 3d-shadow - 三维显示元素的阴影颜色.
    • active-border - 活动窗口边框。
    • active-caption - Active window title bar. Specifies the left side color in the color gradient of an active window's title bar if the gradient effect is enabled.
    • active-caption-gradient - 活动窗口标题栏的颜色渐变中的右侧颜色。
    • app-workspace - 多文档界面 (MDI) 应用程序的背景颜色。
    • button-text - 按钮上的文本。
    • caption-text - 标题，大小框和滚动条箭头框中的文本。
    • desktop - 桌面的背景色。
    • disabled-text - 灰色 (禁用的) 文字.
    • highlight - 在控件中选择的项目。
    • highlight-text - 在控件中选择的项目文本。
    • hotlight - 超链接或热追踪项目的颜色。
    • inactive-border - 非活动窗口边框。
    • inactive-caption - Inactive window caption. Specifies the left side color in the color gradient of an inactive window's title bar if the gradient effect is enabled.
    • inactive-caption-gradient - 非活动窗口标题栏的颜色渐变中的右侧颜色。
    • inactive-caption-text - 非活动标题中的文字颜色。
    • info-background - 工具提示控件的背景颜色。
    • info-text - 工具提示控件的文本颜色。
    • menu - 菜单的背景色.
    • menu-highlight - 当菜单显示为平面菜单时用于突出显示菜单项的颜色。
    • menubar - 菜单显示为平面菜单时菜单栏的背景颜色。
    • menu-text - 菜单的文字.
    • scrollbar - 滚动条的灰色区域.
    • window - 窗口的背景色.
    • window-frame - 窗口框.
    • window-text - 窗口的文字。
  • On macOS
    • alternate-selected-control-text - The text on a selected surface in a list or table. 已废弃
    • control-background - The background of a large interface element, such as a browser or table.
    • control - The surface of a control.
    • control-text -The text of a control that isn’t disabled.
    • disabled-control-text - The text of a control that’s disabled.
    • find-highlight - The color of a find indicator.
    • grid - The gridlines of an interface element such as a table.
    • header-text - The text of a header cell in a table.
    • highlight - The virtual light source onscreen.
    • keyboard-focus-indicator - The ring that appears around the currently focused control when using the keyboard for interface navigation.
    • label - The text of a label containing primary content.
    • link - A link to other content.
    • placeholder-text - A placeholder string in a control or text view.
    • quaternary-label - The text of a label of lesser importance than a tertiary label such as watermark text.
    • scrubber-textured-background - The background of a scrubber in the Touch Bar.
    • secondary-label - The text of a label of lesser importance than a normal label such as a label used to represent a subheading or additional information.
    • selected-content-background - The background for selected content in a key window or view.
    • selected-control - The surface of a selected control.
    • selected-control-text - The text of a selected control.
    • selected-menu-item-text - The text of a selected menu.
    • selected-text-background - The background of selected text.
    • selected-text - Selected text.
    • separator - A separator between different sections of content.
    • shadow - The virtual shadow cast by a raised object onscreen.
    • tertiary-label - The text of a label of lesser importance than a secondary label such as a label used to represent disabled text.
    • text-background - Text background.
    • text - The text in a document.
    • under-page-background - The background behind a document's content.
    • unemphasized-selected-content-background - The selected content in a non-key window or view.
    • unemphasized-selected-text-background - A background for selected text in a non-key window or view.
    • unemphasized-selected-text - Selected text in a non-key window or view.
    • window-background - The background of a window.
    • window-frame-text - The text in the window's titlebar area.

返回 String -系统颜色设置为RGB十六进制格式 (#ABCDEF). 更多详细信息请参阅 Windows docs 和 macOS 文档。

以下颜色仅在 macOS 10.14 上可用：find-hightlight, selected-content-background, separator, unemphasized-selected-content-background, unemphasized-selected-text-background, 和 unemphasized-selected-text

systemPreferences.getSystemColor(color) macOS

• color String - One of the following values:
  • blue
  • brown
  • gray
  • green
  • orange
  • pink
  • purple
  • red
  • yellow

返回 String - 标准系统颜色，格式为 #RRGGBBAA。

返回几个标准系统颜色之一，这些颜色可自动适应鲜艳度的变化并更改辅助功能设置，如"增加对比度"和"降低透明度"。 有关更多详细信息，请参阅 apple 文档 。

systemPreferences.isInvertedColorScheme() Windows Deprecated

返回 Boolean - 如果使用反转颜色方案(亮文字暗背景的高对比度主题) 则为true，否则为false。

已废弃： 请使用新的 nativeTheme.shouldUseInvertedColorScheme API。

systemPreferences.isHighContrastColorScheme() macOS Windows Deprecated

返回 Boolean - 如果启用了高对比度主题为true，否则为false。

已废弃： 请使用新的 nativeTheme.shouldUseHighContrastColors API。

systemPreferences.getEffectiveAppearance() macOS

返回 String - 其值可能是 dark、light 或 unknown.

获取当前应用到你的程序上的 macOS 设置项，会映射到 NSApplication.effectiveAppearance

systemPreferences.getAppLevelAppearance() macOS Deprecated

返回 String | null - 其值可能为 dark、light 或 unknown。

获取您在macOS上为您的应用程序设置的外观，映射到NSApplication.appearance。 您可以使用 setAppLevelAppearance API 来设置此值。

systemPreferences.setAppLevelAppearance(appearance) macOS Deprecated

• appearance String | null - 可以是 dark 或 light

设定您的应用程序的外观设置，这应该覆盖系统默认值以及覆盖 getEffectiveAppearance 的值。

systemPreferences.canPromptTouchID() macOS

返回 Boolean - 此设备是否有能力使用 Touch ID。

注意：在 macOS 系统的版本低于 Sierra 10.12.2时，此 API 将返回 false 。

systemPreferences.promptTouchID(reason) macOS

• reason String - The reason you are asking for Touch ID authentication

返回 Promise<void> - resolve如果用户已成功通过Touch ID授权。

const { systemPreferences } = require('electron')

systemPreferences.promptTouchID('To get consent for a Security-Gated Thing').then(success => {
  console.log('You have successfully authenticated with Touch ID!')
}).catch(err => {
  console.log(err)
})

此 API 本身不会保护您的用户数据；相反，这是一个机制，让你这样做。 原生应用需要在其密钥链入口设置 访问控制常量 ，如 kSecAccessControlUserPresence ，当应用读取到后将自动提示 Touch ID 生物识别许可。 该操作可以通过 node-keytar完成，这样，应用就会用 node-keytar 存储加密密钥，并且只有在 promptTouchID() resolve时才能取出。

注意：在 macOS 系统的版本低于 Sierra 10.12.2时，此 API 返回的Promise将reject 。

systemPreferences.isTrustedAccessibilityClient(prompt) macOS

• prompt Boolean - whether or not the user will be informed via prompt if the current process is untrusted.

返回 Boolean - 如果当前进程是受信任的无障碍客户端，则为true，否则为 false 。

systemPreferences.getMediaAccessStatus(mediaType) Windows macOS

• mediaType String - 可以是 microphone, camera 或 screen.

返回 String - 值可以是 not-determined， granted， denied， restricted 或 unknown。

在 macOS 10.13 High Sierra 或更低版本上不需要用户授权，因此此方法总是返回 granted。 macOS 10.14 Mojave 或更高版本需要授权访问 麦克风 和 摄像头。 macOS 10.15 Catalina 或更高版本需要授权访问 屏幕。

Windows 10的全局设置控制了所有win32 应用程序对 麦克风 和 摄像头的访问权限。 It will always return granted for screen and for all media types on older versions of Windows.

systemPreferences.askForMediaAccess(mediaType) macOS

• mediaType String - the type of media being requested; can be microphone, camera.

Returns Promise<Boolean> - A promise that resolves with true if consent was granted and false if it was denied. If an invalid mediaType is passed, the promise will be rejected. If an access request was denied and later is changed through the System Preferences pane, a restart of the app will be required for the new permissions to take effect. If access has already been requested and denied, it must be changed through the preference pane; an alert will not pop up and the promise will resolve with the existing access status.

Important: In order to properly leverage this API, you must set the NSMicrophoneUsageDescription and NSCameraUsageDescription strings in your app's Info.plist file. The values for these keys will be used to populate the permission dialogs so that the user will be properly informed as to the purpose of the permission request. See Electron Application Distribution for more information about how to set these in the context of Electron.

This user consent was not required until macOS 10.14 Mojave, so this method will always return true if your system is running 10.13 High Sierra or lower.

systemPreferences.getAnimationSettings()

返回 Object:

• shouldRenderRichAnimation Boolean - Returns true if rich animations should be rendered. Looks at session type (e.g. remote desktop) and accessibility settings to give guidance for heavy animations.
• scrollAnimationsEnabledBySystem Boolean - Determines on a per-platform basis whether scroll animations (e.g. produced by home/end key) should be enabled.
• prefersReducedMotion Boolean - Determines whether the user desires reduced motion based on platform APIs.

Returns an object with system animation settings.

属性

systemPreferences.appLevelAppearance macOS

一个类型为String的属性，此属性可能的值为：dark, light or unknown. It determines the macOS appearance setting for your application. This maps to values in: NSApplication.appearance. Setting this will override the system default as well as the value of getEffectiveAppearance.

Possible values that can be set are dark and light, and possible return values are dark, light, and unknown.

This property is only available on macOS 10.14 Mojave or newer.

systemPreferences.effectiveAppearance macOS 只读

一个类型为String的属性，此属性可能的值为：dark, light or unknown.

Returns the macOS appearance setting that is currently applied to your application, maps to NSApplication.effectiveAppearance