60 lines
2.3 KiB
Markdown
60 lines
2.3 KiB
Markdown
# Accessibility
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Accessibility concerns in Electron applications are similar to those of
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websites because they're both ultimately HTML.
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## Manually enabling accessibility features
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Electron applications will automatically enable accessibility features in the
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presence of assistive technology (e.g. [JAWS](https://www.freedomscientific.com/products/software/jaws/)
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on Windows or [VoiceOver](https://help.apple.com/voiceover/mac/10.15/) on macOS).
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See Chrome's [accessibility documentation][a11y-docs] for more details.
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You can also manually toggle these features either within your Electron application
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or by setting flags in third-party native software.
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### Using Electron's API
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By using the [`app.setAccessibilitySupportEnabled(enabled)`][setAccessibilitySupportEnabled]
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API, you can manually expose Chrome's accessibility tree to users in the application preferences.
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Note that the user's system assistive utilities have priority over this setting and
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will override it.
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### Within third-party software
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#### macOS
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On macOS, third-party assistive technology can toggle accessibility features inside
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Electron applications by setting the `AXManualAccessibility` attribute
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programmatically:
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Using Objective-C:
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```objc
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CFStringRef kAXManualAccessibility = CFSTR("AXManualAccessibility");
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+ (void)enableAccessibility:(BOOL)enable inElectronApplication:(NSRunningApplication *)app
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{
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AXUIElementRef appRef = AXUIElementCreateApplication(app.processIdentifier);
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if (appRef == nil)
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return;
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CFBooleanRef value = enable ? kCFBooleanTrue : kCFBooleanFalse;
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AXUIElementSetAttributeValue(appRef, kAXManualAccessibility, value);
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CFRelease(appRef);
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}
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```
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Using Swift:
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```swift
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import Cocoa
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let name = CommandLine.arguments.count >= 2 ? CommandLine.arguments[1] : "Electron"
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let pid = NSWorkspace.shared.runningApplications.first(where: {$0.localizedName == name})!.processIdentifier
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let axApp = AXUIElementCreateApplication(pid)
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let result = AXUIElementSetAttributeValue(axApp, "AXManualAccessibility" as CFString, true as CFTypeRef)
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print("Setting 'AXManualAccessibility' \(error.rawValue == 0 ? "succeeded" : "failed")")
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```
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[a11y-docs]: https://www.chromium.org/developers/design-documents/accessibility#TOC-How-Chrome-detects-the-presence-of-Assistive-Technology
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[setAccessibilitySupportEnabled]: ../api/app.md#appsetaccessibilitysupportenabledenabled-macos-windows
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