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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_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_WIN_H_
#define CHROME_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_WIN_H_
#pragma once
#include <atlbase.h>
#include <atlcom.h>
#include <oleacc.h>
#include <hash_map>
#include <vector>
#include "chrome/browser/accessibility/browser_accessibility_manager.h"
#include "base/hash_tables.h"
#include "base/scoped_comptr_win.h"
#include "base/scoped_ptr.h"
#include "webkit/glue/webaccessibility.h"
class BrowserAccessibilityWin;
struct ViewHostMsg_AccessibilityNotification_Params;
class BrowserAccessibilityWinFactory {
public:
virtual ~BrowserAccessibilityWinFactory() {}
// Create an instance of BrowserAccessibilityWin and return a new
// reference to it.
virtual BrowserAccessibilityWin* Create();
};
// Manages a tree of BrowserAccessibilityWin objects.
class BrowserAccessibilityManagerWin : public BrowserAccessibilityManager {
public:
BrowserAccessibilityManagerWin(
HWND parent_window,
const webkit_glue::WebAccessibility& src,
BrowserAccessibilityDelegate* delegate,
BrowserAccessibilityWinFactory* factory =
new BrowserAccessibilityWinFactory());
virtual ~BrowserAccessibilityManagerWin();
// Return a pointer to the root of the tree, does not make a new reference.
BrowserAccessibilityWin* GetRoot();
// Removes the BrowserAccessibilityWin 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.
BrowserAccessibilityWin* GetFromChildID(LONG child_id);
// Get a the default IAccessible for the parent window, does not make a
// new reference.
IAccessible* GetParentWindowIAccessible();
// Return the object that has focus, if it's a descandant of the
// given root (inclusive). Does not make a new reference.
BrowserAccessibilityWin* GetFocus(BrowserAccessibilityWin* root);
// Tell the renderer to set focus to this node.
void SetFocus(const BrowserAccessibilityWin& node);
// Tell the renderer to do the default action for this node.
void DoDefaultAction(const BrowserAccessibilityWin& node);
// BrowserAccessibilityManager Methods
virtual void GotFocus();
virtual IAccessible* GetRootAccessible();
virtual void OnAccessibilityObjectStateChange(
const webkit_glue::WebAccessibility& acc_obj);
virtual void OnAccessibilityObjectChildrenChange(
const webkit_glue::WebAccessibility& acc_obj);
virtual void OnAccessibilityObjectFocusChange(
const webkit_glue::WebAccessibility& acc_obj);
virtual void OnAccessibilityObjectLoadComplete(
const webkit_glue::WebAccessibility& acc_obj);
virtual void OnAccessibilityObjectValueChange(
const webkit_glue::WebAccessibility& acc_obj);
virtual void OnAccessibilityObjectTextChange(
const webkit_glue::WebAccessibility& acc_obj);
private:
// Recursively compare the IDs of our subtree to a new subtree received
// from the renderer and return true if their IDs match exactly.
bool CanModifyTreeInPlace(
BrowserAccessibilityWin* current_root,
const webkit_glue::WebAccessibility& new_root);
// Recursively modify a subtree (by reinitializing) to match a new
// subtree received from the renderer process. Should only be called
// if CanModifyTreeInPlace returned true.
void ModifyTreeInPlace(
BrowserAccessibilityWin* current_root,
const webkit_glue::WebAccessibility& new_root);
// Update the accessibility tree with an updated WebAccessibility tree or
// subtree received from the renderer process. First attempts to modify
// the tree in place, and if that fails, replaces the entire subtree.
// Returns the updated node or NULL if no node was updated.
BrowserAccessibilityWin* UpdateTree(
const webkit_glue::WebAccessibility& acc_obj);
// Returns the next MSAA child id.
static LONG GetNextChildID();
// Recursively build a tree of BrowserAccessibilityWin objects from
// the WebAccessibility tree received from the renderer process.
BrowserAccessibilityWin* CreateAccessibilityTree(
BrowserAccessibilityWin* parent,
int child_id,
const webkit_glue::WebAccessibility& src,
int index_in_parent);
// The object that can perform actions on our behalf.
BrowserAccessibilityDelegate* delegate_;
// Factory to create BrowserAccessibility objects (for dependency injection).
scoped_ptr<BrowserAccessibilityWinFactory> 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.
BrowserAccessibilityWin* root_;
BrowserAccessibilityWin* 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 BrowserAccessibilityWin objects.
base::hash_map<LONG, BrowserAccessibilityWin*> 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(BrowserAccessibilityManagerWin);
};
#endif // CHROME_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_WIN_H_
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