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package com.android.camera;
import android.accessibilityservice.AccessibilityServiceInfo;
import android.content.Context;
import android.support.v4.view.accessibility.AccessibilityManagerCompat;
import android.view.View;
import android.view.accessibility.AccessibilityManager;
import android.widget.Button;
import com.android.camera.debug.Log;
import com.android.camera.ui.MainActivityLayout;
import com.android.camera.ui.PreviewOverlay;
import com.android.camera.util.AndroidServices;
import com.android.camera2.R;
import java.util.List;
/**
* AccessibilityUtil provides methods for use when the device is in
* accessibility mode
*/
public class AccessibilityUtil {
private final static Log.Tag TAG = new Log.Tag("AccessibilityUtil");
private static final float MIN_ZOOM = 1f;
// Filters for Google accessibility services
private static final String ACCESSIBILITY_PACKAGE_NAME_PREFIX = "com.google";
private PreviewOverlay mPreviewOverlay;
private Button mZoomPlusButton;
private Button mZoomMinusButton;
private float mMaxZoom;
private View.OnClickListener zoomInListener = new View.OnClickListener() {
@Override
public void onClick(View view) {
float currentZoom = mPreviewOverlay.zoomIn(view, mMaxZoom);
// Zooming in implies that you must be able to subsequently zoom
// out.
mZoomMinusButton.setEnabled(true);
// Make sure it doesn't go above max zoom.
if (currentZoom == mMaxZoom) {
mZoomPlusButton.setEnabled(false);
}
}
};
private View.OnClickListener zoomOutListener = new View.OnClickListener() {
@Override
public void onClick(View view) {
float currentZoom = mPreviewOverlay.zoomOut(view, mMaxZoom);
// Zooming out implies that you must be able to subsequently zoom
// in.
mZoomPlusButton.setEnabled(true);
// Make sure it doesn't go below min zoom.
if (currentZoom == MIN_ZOOM) {
mZoomMinusButton.setEnabled(false);
}
}
};
public AccessibilityUtil(PreviewOverlay previewOverlay, View view) {
mPreviewOverlay = previewOverlay;
mZoomPlusButton = (Button) view.findViewById(R.id.accessibility_zoom_plus_button);
mZoomMinusButton = (Button) view.findViewById(R.id.accessibility_zoom_minus_button);
mZoomPlusButton.setOnClickListener(zoomInListener);
mZoomMinusButton.setOnClickListener(zoomOutListener);
}
/**
* Enables the zoom UI with zoom in/zoom out buttons.
*
* @param maxZoom is maximum zoom on the given device
*/
public void showZoomUI(float maxZoom) {
mMaxZoom = maxZoom;
mZoomPlusButton.setVisibility(View.VISIBLE);
mZoomMinusButton.setVisibility(View.VISIBLE);
mZoomMinusButton.setEnabled(false);
}
public void hideZoomUI() {
mZoomPlusButton.setVisibility(View.GONE);
mZoomMinusButton.setVisibility(View.GONE);
}
/**
* Returns the accessibility manager.
*/
private android.view.accessibility.AccessibilityManager getAccessibilityManager() {
return AndroidServices.instance().provideAccessibilityManager();
}
/**
* Returns whether touch exploration is enabled.
*/
private boolean isTouchExplorationEnabled() {
android.view.accessibility.AccessibilityManager accessibilityManager = getAccessibilityManager();
return accessibilityManager.isTouchExplorationEnabled();
}
/**
* Checks whether Google accessibility services are enabled, including
* TalkBack, Switch Access, and others
*
* @return boolean
*/
private boolean containsGoogleAccessibilityService() {
android.view.accessibility.AccessibilityManager accessibilityManager = getAccessibilityManager();
List<AccessibilityServiceInfo> enabledServices =
accessibilityManager
.getEnabledAccessibilityServiceList(AccessibilityServiceInfo.FEEDBACK_ALL_MASK);
if (enabledServices != null) {
for (AccessibilityServiceInfo enabledService : enabledServices) {
String serviceId = enabledService.getId();
if (serviceId != null && serviceId.startsWith(ACCESSIBILITY_PACKAGE_NAME_PREFIX)) {
return true;
}
}
}
return false;
}
/**
* Returns whether a touch exploration is enabled or a Google accessibility
* service is enabled.
*/
public boolean isAccessibilityEnabled() {
return isTouchExplorationEnabled()
|| containsGoogleAccessibilityService();
}
}
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