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// Copyright (c) 2010 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 CHROME_BROWSER_BROWSER_ACCESSIBILITY_MANAGER_WIN_H_
#define CHROME_BROWSER_BROWSER_ACCESSIBILITY_MANAGER_WIN_H_
#pragma once
#include <atlbase.h>
#include <atlcom.h>
#include <oleacc.h>
#include <hash_map>
#include <vector>
#include "base/hash_tables.h"
#include "base/scoped_comptr_win.h"
#include "base/scoped_ptr.h"
#include "webkit/glue/webaccessibility.h"
class BrowserAccessibility;
class BrowserAccessibilityFactory {
public:
virtual ~BrowserAccessibilityFactory() {}
// Create an instance of BrowserAccessibility and return a new
// reference to it.
virtual BrowserAccessibility* Create();
};
// Class that can perform actions on behalf of the BrowserAccessibilityManager.
class BrowserAccessibilityDelegate {
public:
virtual ~BrowserAccessibilityDelegate() {}
virtual void SetAccessibilityFocus(int acc_obj_id) = 0;
virtual void AccessibilityDoDefaultAction(int acc_obj_id) = 0;
virtual void AccessibilityObjectChildrenChangeAck() = 0;
};
// Manages a tree of BrowserAccessibility objects.
class BrowserAccessibilityManager {
public:
BrowserAccessibilityManager(
HWND parent_hwnd,
const webkit_glue::WebAccessibility& src,
BrowserAccessibilityDelegate* delegate,
BrowserAccessibilityFactory* factory = new BrowserAccessibilityFactory());
virtual ~BrowserAccessibilityManager();
// Return a pointer to the root of the tree, does not make a new reference.
BrowserAccessibility* GetRoot();
// Removes the BrowserAccessibility child_id from the manager.
void Remove(LONG child_id);
// Return a pointer to the object corresponding to the given child_id,
// does not make a new reference.
BrowserAccessibility* GetFromChildID(LONG child_id);
// Get a the default IAccessible for the parent window, does not make a
// new reference.
IAccessible* GetParentWindowIAccessible();
// Get the parent window.
HWND GetParentHWND();
// Return the object that has focus, if it's a descandant of the
// given root (inclusive). Does not make a new reference.
BrowserAccessibility* GetFocus(BrowserAccessibility* root);
// Tell the renderer to set focus to this node.
void SetFocus(const BrowserAccessibility& node);
// Tell the renderer to do the default action for this node.
void DoDefaultAction(const BrowserAccessibility& node);
// Called when the renderer process has notified us of a focus, state,
// or children change. Send a notification to MSAA clients of the change.
void OnAccessibilityFocusChange(int acc_obj_id);
void OnAccessibilityObjectStateChange(
const webkit_glue::WebAccessibility& acc_obj);
void OnAccessibilityObjectChildrenChange(
const std::vector<webkit_glue::WebAccessibility>& acc_changes);
private:
// Update the accessibility tree with an updated WebAccessibility tree or
// subtree received from the renderer process. Returns the updated node or
// NULL if no node was updated.
BrowserAccessibility* UpdateTree(
const webkit_glue::WebAccessibility& acc_obj);
// Returns the next MSAA child id.
static LONG GetNextChildID();
// Recursively build a tree of BrowserAccessibility objects from
// the WebAccessibility tree received from the renderer process.
BrowserAccessibility* CreateAccessibilityTree(
BrowserAccessibility* parent,
int child_id,
const webkit_glue::WebAccessibility& src,
int index_in_parent);
// The parent window.
HWND parent_hwnd_;
// The object that can perform actions on our behalf.
BrowserAccessibilityDelegate* delegate_;
// Factory to create BrowserAccessibility objects (for dependency injection).
scoped_ptr<BrowserAccessibilityFactory> factory_;
// A default IAccessible instance for the parent window.
ScopedComPtr<IAccessible> window_iaccessible_;
// The root of the tree of IAccessible objects and the element that
// currently has focus, if any.
BrowserAccessibility* root_;
BrowserAccessibility* focus_;
// A mapping from the IDs of objects in the renderer, to the child IDs
// we use internally here.
base::hash_map<int, LONG> renderer_id_to_child_id_map_;
// A mapping from child IDs to BrowserAccessibility objects.
base::hash_map<LONG, BrowserAccessibility*> child_id_map_;
// The next child ID to use; static so that they're global to the process.
// Screen readers cache these IDs to see if they've seen the same object
// before so we should avoid reusing them within the same project.
static LONG next_child_id_;
DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityManager);
};
#endif // CHROME_BROWSER_BROWSER_ACCESSIBILITY_MANAGER_WIN_H_
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