package com.android.camera;
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import android.accessibilityservice.AccessibilityServiceInfo;
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import android.content.Context;
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import androidx.core.view.accessibility.AccessibilityManagerCompat;
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import android.view.View;
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import android.view.accessibility.AccessibilityManager;
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import android.widget.Button;
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import com.android.camera.debug.Log;
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import com.android.camera.ui.MainActivityLayout;
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import com.android.camera.ui.PreviewOverlay;
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import com.android.camera.util.AndroidServices;
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import com.android.camera2.R;
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import java.util.List;
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/**
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* AccessibilityUtil provides methods for use when the device is in
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* accessibility mode
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*/
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public class AccessibilityUtil {
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private final static Log.Tag TAG = new Log.Tag("AccessibilityUtil");
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private static final float MIN_ZOOM = 1f;
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// Filters for Google accessibility services
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private static final String ACCESSIBILITY_PACKAGE_NAME_PREFIX = "com.google";
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private PreviewOverlay mPreviewOverlay;
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private Button mZoomPlusButton;
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private Button mZoomMinusButton;
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private float mMaxZoom;
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private View.OnClickListener zoomInListener = new View.OnClickListener() {
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@Override
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public void onClick(View view) {
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float currentZoom = mPreviewOverlay.zoomIn(view, mMaxZoom);
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// Zooming in implies that you must be able to subsequently zoom
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// out.
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mZoomMinusButton.setEnabled(true);
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// Make sure it doesn't go above max zoom.
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if (currentZoom == mMaxZoom) {
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mZoomPlusButton.setEnabled(false);
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}
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}
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};
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private View.OnClickListener zoomOutListener = new View.OnClickListener() {
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@Override
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public void onClick(View view) {
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float currentZoom = mPreviewOverlay.zoomOut(view, mMaxZoom);
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// Zooming out implies that you must be able to subsequently zoom
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// in.
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mZoomPlusButton.setEnabled(true);
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// Make sure it doesn't go below min zoom.
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if (currentZoom == MIN_ZOOM) {
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mZoomMinusButton.setEnabled(false);
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}
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}
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};
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public AccessibilityUtil(PreviewOverlay previewOverlay, View view) {
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mPreviewOverlay = previewOverlay;
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mZoomPlusButton = (Button) view.findViewById(R.id.accessibility_zoom_plus_button);
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mZoomMinusButton = (Button) view.findViewById(R.id.accessibility_zoom_minus_button);
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mZoomPlusButton.setOnClickListener(zoomInListener);
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mZoomMinusButton.setOnClickListener(zoomOutListener);
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}
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/**
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* Enables the zoom UI with zoom in/zoom out buttons.
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*
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* @param maxZoom is maximum zoom on the given device
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*/
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public void showZoomUI(float maxZoom) {
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mMaxZoom = maxZoom;
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mZoomPlusButton.setVisibility(View.VISIBLE);
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mZoomMinusButton.setVisibility(View.VISIBLE);
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mZoomMinusButton.setEnabled(false);
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}
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public void hideZoomUI() {
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mZoomPlusButton.setVisibility(View.GONE);
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mZoomMinusButton.setVisibility(View.GONE);
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}
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/**
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* Returns the accessibility manager.
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*/
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private android.view.accessibility.AccessibilityManager getAccessibilityManager() {
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return AndroidServices.instance().provideAccessibilityManager();
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}
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/**
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* Returns whether touch exploration is enabled.
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*/
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private boolean isTouchExplorationEnabled() {
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android.view.accessibility.AccessibilityManager accessibilityManager = getAccessibilityManager();
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return accessibilityManager.isTouchExplorationEnabled();
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}
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/**
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* Checks whether Google accessibility services are enabled, including
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* TalkBack, Switch Access, and others
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*
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* @return boolean
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*/
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private boolean containsGoogleAccessibilityService() {
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android.view.accessibility.AccessibilityManager accessibilityManager = getAccessibilityManager();
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List<AccessibilityServiceInfo> enabledServices =
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accessibilityManager
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.getEnabledAccessibilityServiceList(AccessibilityServiceInfo.FEEDBACK_ALL_MASK);
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if (enabledServices != null) {
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for (AccessibilityServiceInfo enabledService : enabledServices) {
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String serviceId = enabledService.getId();
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if (serviceId != null && serviceId.startsWith(ACCESSIBILITY_PACKAGE_NAME_PREFIX)) {
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return true;
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}
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}
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}
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return false;
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}
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/**
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* Returns whether a touch exploration is enabled or a Google accessibility
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* service is enabled.
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*/
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public boolean isAccessibilityEnabled() {
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return isTouchExplorationEnabled()
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|| containsGoogleAccessibilityService();
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}
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}
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