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gaia/tests/atoms/accessibility.js

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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+'use strict';
+
+/* globals Components, marionetteScriptFinished */
+/* exported Accessibility */
+
+var Accessibility = {
+
+  _accRetrieval: Components.classes[
+    '@mozilla.org/accessibleRetrieval;1'].getService(
+      Components.interfaces.nsIAccessibleRetrieval),
+
+  _getAccessible:
+    function Accessibility__getAccessible(element, callback, once) {
+    let attempts = 500;
+    let intervalId = setInterval(() => {
+      let acc = this._accRetrieval.getAccessibleFor(element);
+      if (acc || --attempts <= 0 || once) {
+        clearInterval(intervalId);
+        if (attempts <= 0) {
+          let tagName = element ? element.tagName : undefined;
+          let elemId = element ? element.id : undefined;
+          console.log('accessibility.js: failed to get accessible for tag=\"' +
+            tagName + '\" id=\"' + elemId + '\"');
+        }
+        try {
+          callback(acc);
+        } catch (e) {
+          marionetteScriptFinished({ error: e.message });
+        }
+      }
+    }, 10);
+  },
+
+  _matchState: function Accessibility__matchState(acc, stateName) {
+    let stateToMatch = Components.interfaces.nsIAccessibleStates[stateName];
+    let state = {};
+    let extState = {};
+    acc.getState(state, extState);
+    return !!(state.value & stateToMatch);
+  },
+
+  click: function Accessibility_click(element) {
+    this._getAccessible(element.wrappedJSObject, function(acc) {
+      acc.doAction(0);
+      marionetteScriptFinished();
+    });
+  },
+
+  wheel: function Accessibility_wheel(element, direction) {
+    let horizontal = direction === 'left' || direction === 'right';
+    let page = (direction === 'left' || direction === 'up') ? 1 : -1;
+    let event = new window.wrappedJSObject.WheelEvent('wheel', {
+      bubbles: true,
+      cancelable: true,
+      deltaX: horizontal ? page : 0,
+      deltaY: horizontal ? 0 : page,
+      deltaMode: window.wrappedJSObject.WheelEvent.DOM_DELTA_PAGE,
+    });
+    element.wrappedJSObject.dispatchEvent(event);
+  },
+
+  isDisabled: function Accessibility_isDisabled(element) {
+    this._getAccessible(element.wrappedJSObject, (acc) => {
+      marionetteScriptFinished(
+        { result: this._matchState(acc, 'STATE_UNAVAILABLE') });
+    });
+  },
+
+  _isAriaHidden: function Accessibility__isAriaHidden(element) {
+    do {
+      if (JSON.parse(element.getAttribute('aria-hidden'))) {
+        return true;
+      }
+      element = element.parentNode;
+    } while (element && element.getAttribute);
+  },
+
+  isHidden: function Accessibility_isHidden(element) {
+    let elem = element.wrappedJSObject;
+    if (this._isAriaHidden(elem)) {
+      marionetteScriptFinished({ result: true });
+      return;
+    }
+
+    this._getAccessible(elem, (acc) => {
+      if (!acc) {
+        marionetteScriptFinished({ result: true });
+        return;
+      }
+      marionetteScriptFinished(
+        { result: this._matchState(acc, 'STATE_INVISIBLE') });
+    }, true);
+  },
+
+  isVisible: function Accessibility_isVisible(element) {
+    let elem = element.wrappedJSObject;
+    if (this._isAriaHidden(elem)) {
+      marionetteScriptFinished({ result: false });
+      return;
+    }
+
+    this._getAccessible(elem, (acc) => {
+      marionetteScriptFinished(
+        { result: !this._matchState(acc, 'STATE_INVISIBLE') });
+    });
+  },
+
+  getName: function Accessibility_getName(element) {
+    this._getAccessible(element.wrappedJSObject, (acc) => {
+      marionetteScriptFinished({ result: acc.name });
+    });
+  },
+
+  getRole: function Accessibility_getRole(element) {
+    this._getAccessible(element.wrappedJSObject, (acc) => {
+      marionetteScriptFinished(
+        { result: this._accRetrieval.getStringRole(acc.role) });
+    });
+  },
+};