weblayer/browser/java/org/chromium/weblayer_private/WebLayerAccessibilityUtil.java

// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package org.chromium.weblayer_private;

import org.chromium.ui.util.AccessibilityUtil;

/**
 * Exposes information about the current accessibility state.
 */
public class WebLayerAccessibilityUtil extends AccessibilityUtil {
    private static WebLayerAccessibilityUtil sInstance;

    public static WebLayerAccessibilityUtil get() {
        if (sInstance == null) sInstance = new WebLayerAccessibilityUtil();
        return sInstance;
    }

    private WebLayerAccessibilityUtil() {}

    public void onBrowserResumed() {
        // When a browser is resumed the cached state may have be stale and needs to be
        // recalculated.
        updateIsAccessibilityEnabledAndNotify();
    }

    public void onAllBrowsersDestroyed() {
        // When there are no more browsers alive there is no need to monitor state. Calling
        // isAccessibilityEnabled() will trigger observing the necessary state.
        stopTrackingStateAndRemoveObservers();
    }
}