Display images in multiline Braille

chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js

 // Copyright 2015 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.
 
 /**
  * @fileoverview Handles automation from a desktop automation node.
  */
 
 goog.provide('DesktopAutomationHandler');
 
@@ skipping 44 matching lines @@
   this.addListener_(EventType.CHECKED_STATE_CHANGED,
                     this.onCheckedStateChanged);
   this.addListener_(EventType.CHILDREN_CHANGED,
                     this.onActiveDescendantChanged);
   this.addListener_(EventType.EXPANDED_CHANGED,
                     this.onEventIfInRange);
   this.addListener_(EventType.FOCUS,
                     this.onFocus);
   this.addListener_(EventType.HOVER,
                     this.onHover);
+  this.addListener_(EventType.IMAGE_FRAME_UPDATED,
+                    this.onImageFrameUpdated);
   this.addListener_(EventType.INVALID_STATUS_CHANGED,
                     this.onEventIfInRange);
   this.addListener_(EventType.LOAD_COMPLETE,
                     this.onLoadComplete);
   this.addListener_(EventType.MENU_END,
                     this.onMenuEnd);
   this.addListener_(EventType.MENU_LIST_ITEM_SELECTED,
                     this.onEventIfSelected);
   this.addListener_(EventType.MENU_START,
                     this.onMenuStart);
@@ skipping 331 matching lines @@
       ChromeVoxState.instance.setCurrentRange(selectedRange);
     }
 
     // TODO(plundblad): This can currently be null for contenteditables.
     // Clean up when it can't.
     if (this.textEditHandler_)
       this.textEditHandler_.onEvent(evt);
   },
 
   /**
+   * Provides all feedback once a image frame updated event fires.
+   * @param {!AutomationEvent} evt
+   */
+  onImageFrameUpdated: function(evt) {
+    var node = evt.target;

[David Tseng, 2017/02/22 18:15:24]

I don't think you need most or any of this. If this event comes back as a result
of us requesting image data, then just output the braille directly without all
of the calls to Output.

+    if (!node)
+      return;
+
+    // If |node| is NOT in the current range, return
+    var prevRange = ChromeVoxState.instance.currentRange;
+    if (!prevRange.contentEquals(cursors.Range.fromNode(node)) &&
+        !node.state.focused) {
+      return;
+    }
+
+    var output = new Output();
+    if (!this.textEditHandler_) {
+      output.withBraille(
+          ChromeVoxState.instance.currentRange, prevRange, evt.type);
+    } else {
+      // Delegate event handling to the text edit handler for braille.
+      this.textEditHandler_.onEvent(evt);
+    }
+    output.go();
+  },
+
+  /**
    * Provides all feedback once a value changed event fires.
    * @param {!AutomationEvent} evt
    */
   onValueChanged: function(evt) {
     // Delegate to the edit text handler if this is an editable.
     if (evt.target.state.editable) {
       this.onEditableChanged_(evt);
       return;
     }
 
@@ skipping 118 matching lines @@
 DesktopAutomationHandler.init_ = function() {
   chrome.automation.getDesktop(function(desktop) {
     ChromeVoxState.desktopAutomationHandler =
         new DesktopAutomationHandler(desktop);
   });
 };
 
 DesktopAutomationHandler.init_();
 
 });  // goog.scope