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/*
* Copyright (C) 2013 DroidDriver committers
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.appium.droiddriver.validators;
import android.annotation.TargetApi;
import android.text.TextUtils;
import android.view.accessibility.AccessibilityNodeInfo;
import io.appium.droiddriver.UiElement;
import io.appium.droiddriver.actions.Action;
import io.appium.droiddriver.uiautomation.UiAutomationElement;
/**
* Fall-back Validator for accessibility.
*/
@TargetApi(14)
public class DefaultAccessibilityValidator implements Validator {
@Override
public boolean isApplicable(UiElement element, Action action) {
return true;
}
@Override
public String validate(UiElement element, Action action) {
return isSpeakingNode(element) ? null : "TalkBack cannot speak about it";
}
// Logic from TalkBack
private static boolean isAccessibilityFocusable(UiElement element) {
if (isActionableForAccessibility(element)) {
return true;
}
if (isTopLevelScrollItem(element) && (isSpeakingNode(element))) {
return true;
}
return false;
}
private static boolean isTopLevelScrollItem(UiElement element) {
UiElement parent = element.getParent();
return parent != null && parent.isScrollable();
}
@SuppressWarnings("deprecation")
private static boolean isActionableForAccessibility(UiElement element) {
if (element.isFocusable() || element.isClickable() || element.isLongClickable()) {
return true;
}
if (element instanceof UiAutomationElement) {
AccessibilityNodeInfo node = ((UiAutomationElement) element).getRawElement();
return (node.getActions() & AccessibilityNodeInfo.ACTION_FOCUS) == AccessibilityNodeInfo.ACTION_FOCUS;
}
return false;
}
private static boolean isSpeakingNode(UiElement element) {
return hasContentDescriptionOrText(element) || element.isCheckable()
|| hasNonActionableSpeakingChildren(element);
}
private static boolean hasNonActionableSpeakingChildren(UiElement element) {
// Recursively check visible and non-focusable descendant nodes.
for (UiElement child : element.getChildren(UiElement.VISIBLE)) {
if (!isAccessibilityFocusable(child) && isSpeakingNode(child)) {
return true;
}
}
return false;
}
private static boolean hasContentDescriptionOrText(UiElement element) {
return !TextUtils.isEmpty(element.getContentDescription())
|| !TextUtils.isEmpty(element.getText());
}
}
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