@nativescript/core/accessibility/font-scale.ios.js

A JavaScript library providing an easy to use api for interacting with iOS and Android platform APIs.

import { Application } from '../application';
import { FontScaleCategory, getClosestValidFontScale } from './font-scale-common';
export * from './font-scale-common';
let currentFontScale = null;
function fontScaleChanged(origFontScale) {
    const oldValue = currentFontScale;
    currentFontScale = getClosestValidFontScale(origFontScale);
    if (oldValue !== currentFontScale) {
        Application.notify({
            eventName: Application.fontScaleChangedEvent,
            object: Application,
            newValue: currentFontScale,
        });
    }
}
export function getCurrentFontScale() {
    setupConfigListener();
    return currentFontScale;
}
export function getFontScaleCategory() {
    if (currentFontScale < 0.85) {
        return FontScaleCategory.ExtraSmall;
    }
    if (currentFontScale > 1.5) {
        return FontScaleCategory.ExtraLarge;
    }
    return FontScaleCategory.Medium;
}
const sizeMap = new Map([
    [UIContentSizeCategoryExtraSmall, 0.5],
    [UIContentSizeCategorySmall, 0.7],
    [UIContentSizeCategoryMedium, 0.85],
    [UIContentSizeCategoryLarge, 1],
    [UIContentSizeCategoryExtraLarge, 1.15],
    [UIContentSizeCategoryExtraExtraLarge, 1.3],
    [UIContentSizeCategoryExtraExtraExtraLarge, 1.5],
    [UIContentSizeCategoryAccessibilityMedium, 2],
    [UIContentSizeCategoryAccessibilityLarge, 2.5],
    [UIContentSizeCategoryAccessibilityExtraLarge, 3],
    [UIContentSizeCategoryAccessibilityExtraExtraLarge, 3.5],
    [UIContentSizeCategoryAccessibilityExtraExtraExtraLarge, 4],
]);
function contentSizeUpdated(fontSize) {
    if (sizeMap.has(fontSize)) {
        fontScaleChanged(sizeMap.get(fontSize));
        return;
    }
    fontScaleChanged(1);
}
function useIOSFontScale() {
    if (Application.ios.nativeApp) {
        contentSizeUpdated(Application.ios.nativeApp.preferredContentSizeCategory);
    }
    else {
        fontScaleChanged(1);
    }
}
let fontSizeObserver;
function setupConfigListener(attempt = 0) {
    if (fontSizeObserver) {
        return;
    }
    if (!Application.ios.nativeApp) {
        if (attempt > 100) {
            fontScaleChanged(1);
            return;
        }
        // Couldn't get launchEvent to trigger.
        setTimeout(() => setupConfigListener(attempt + 1), 1);
        return;
    }
    fontSizeObserver = Application.ios.addNotificationObserver(UIContentSizeCategoryDidChangeNotification, (args) => {
        const fontSize = args.userInfo.valueForKey(UIContentSizeCategoryNewValueKey);
        contentSizeUpdated(fontSize);
    });
    Application.on(Application.exitEvent, () => {
        if (fontSizeObserver) {
            Application.ios.removeNotificationObserver(fontSizeObserver, UIContentSizeCategoryDidChangeNotification);
            fontSizeObserver = null;
        }
        Application.off(Application.resumeEvent, useIOSFontScale);
    });
    Application.on(Application.resumeEvent, useIOSFontScale);
    useIOSFontScale();
}
export function initAccessibilityFontScale() {
    setupConfigListener();
}
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