Index: content/renderer/renderer_accessibility_complete.h |
diff --git a/content/renderer/renderer_accessibility_complete.h b/content/renderer/renderer_accessibility_complete.h |
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-// Copyright (c) 2012 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. |
- |
-#ifndef CONTENT_RENDERER_RENDERER_ACCESSIBILITY_COMPLETE_H_ |
-#define CONTENT_RENDERER_RENDERER_ACCESSIBILITY_COMPLETE_H_ |
- |
-#include <vector> |
- |
-#include "base/hash_tables.h" |
-#include "base/memory/weak_ptr.h" |
-#include "content/common/accessibility_node_data.h" |
-#include "content/public/renderer/render_view_observer.h" |
-#include "content/renderer/renderer_accessibility.h" |
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebAccessibilityNotification.h" |
- |
-namespace WebKit { |
-class WebAccessibilityObject; |
-class WebDocument; |
-class WebNode; |
-}; |
- |
-namespace content { |
-class RenderViewImpl; |
- |
-// This is the subclass of RendererAccessibility that implements |
-// complete accessibility support for assistive technology (as opposed to |
-// partial support - see RendererAccessibilityFocusOnly). |
-// |
-// This version turns on WebKit's accessibility code and sends |
-// a serialized representation of that tree whenever it changes. It also |
-// handles requests from the browser to perform accessibility actions on |
-// nodes in the tree (e.g., change focus, or click on a button). |
-class RendererAccessibilityComplete : public RendererAccessibility { |
- public: |
- explicit RendererAccessibilityComplete(RenderViewImpl* render_view); |
- virtual ~RendererAccessibilityComplete(); |
- |
- // RenderView::Observer implementation. |
- virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE; |
- virtual void FocusedNodeChanged(const WebKit::WebNode& node) OVERRIDE; |
- virtual void DidFinishLoad(WebKit::WebFrame* frame) OVERRIDE; |
- |
- // RendererAccessibility. |
- virtual void HandleWebAccessibilityNotification( |
- const WebKit::WebAccessibilityObject& obj, |
- WebKit::WebAccessibilityNotification notification) OVERRIDE; |
- |
- private: |
- // Handle an accessibility notification to be sent to the browser process. |
- void HandleAccessibilityNotification( |
- const WebKit::WebAccessibilityObject& obj, |
- AccessibilityNotification notification); |
- |
- // In order to keep track of what nodes the browser knows about, we keep a |
- // representation of the browser tree - just IDs and parent/child |
- // relationships. |
- struct BrowserTreeNode { |
- BrowserTreeNode(); |
- ~BrowserTreeNode(); |
- int32 id; |
- std::vector<BrowserTreeNode*> children; |
- }; |
- |
- // Send queued notifications from the renderer to the browser. |
- void SendPendingAccessibilityNotifications(); |
- |
- // Update our representation of what nodes the browser has, given a |
- // tree of nodes. |
- void UpdateBrowserTree(const AccessibilityNodeData& renderer_node); |
- |
- // Clear the given node and recursively delete all of its descendants |
- // from the browser tree. (Does not delete |browser_node|). |
- void ClearBrowserTreeNode(BrowserTreeNode* browser_node); |
- |
- // Handlers for messages from the browser to the renderer. |
- void OnDoDefaultAction(int acc_obj_id); |
- void OnNotificationsAck(); |
- void OnChangeScrollPosition(int acc_obj_id, int scroll_x, int scroll_y); |
- void OnScrollToMakeVisible(int acc_obj_id, gfx::Rect subfocus); |
- void OnScrollToPoint(int acc_obj_id, gfx::Point point); |
- void OnSetFocus(int acc_obj_id); |
- |
- void OnSetTextSelection(int acc_obj_id, int start_offset, int end_offset); |
- |
- // Whether or not this notification typically needs to send |
- // updates to its children, too. |
- bool ShouldIncludeChildren( |
- const AccessibilityHostMsg_NotificationParams& notification); |
- |
- // Checks if a WebKit accessibility object is an editable text node. |
- bool IsEditableText(const WebKit::WebAccessibilityObject& node); |
- |
- // Recursively explore the tree of WebKit accessibility objects rooted |
- // at |src|, and for each editable text node encountered, add a |
- // corresponding WebAccessibility node as a child of |dst|. |
- void RecursiveAddEditableTextNodesToTree( |
- const WebKit::WebAccessibilityObject& src, |
- AccessibilityNodeData* dst); |
- |
- // Build a tree of serializable AccessibilityNodeData nodes to send to the |
- // browser process, given a WebAccessibilityObject node from WebKit. |
- // Modifies |dst| in-place, it's assumed to be empty. |
- void BuildAccessibilityTree(const WebKit::WebAccessibilityObject& src, |
- bool include_children, |
- AccessibilityNodeData* dst); |
- |
- // So we can queue up tasks to be executed later. |
- base::WeakPtrFactory<RendererAccessibilityComplete> weak_factory_; |
- |
- // Notifications from WebKit are collected until they are ready to be |
- // sent to the browser. |
- std::vector<AccessibilityHostMsg_NotificationParams> pending_notifications_; |
- |
- // Our representation of the browser tree. |
- BrowserTreeNode* browser_root_; |
- |
- // A map from IDs to nodes in the browser tree. |
- base::hash_map<int32, BrowserTreeNode*> browser_id_map_; |
- |
- // The most recently observed scroll offset of the root document element. |
- // TODO(dmazzoni): remove once https://bugs.webkit.org/show_bug.cgi?id=73460 |
- // is fixed. |
- gfx::Size last_scroll_offset_; |
- |
- // The current accessibility mode. |
- AccessibilityMode mode_; |
- |
- // Set if we are waiting for an accessibility notification ack. |
- bool ack_pending_; |
- |
- // True if verbose logging of accessibility events is on. |
- bool logging_; |
- |
- DISALLOW_COPY_AND_ASSIGN(RendererAccessibilityComplete); |
-}; |
- |
-#endif // CONTENT_RENDERER_RENDERER_ACCESSIBILITY_COMPLETE_H_ |
- |
-} // namespace content |