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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.
#include "chrome/browser/views/accessibility_event_router_views.h"
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/message_loop.h"
#include "base/utf_string_conversions.h"
#include "chrome/browser/extensions/extension_accessibility_api.h"
#include "chrome/browser/profile.h"
#include "chrome/common/notification_type.h"
#include "views/controls/button/image_button.h"
#include "views/controls/button/menu_button.h"
#include "views/controls/button/native_button.h"
#include "views/controls/link.h"
using views::FocusManager;
using views::View;
AccessibilityEventRouterViews::AccessibilityEventRouterViews()
: ALLOW_THIS_IN_INITIALIZER_LIST(method_factory_(this)) {
}
AccessibilityEventRouterViews::~AccessibilityEventRouterViews() {
}
// static
AccessibilityEventRouterViews* AccessibilityEventRouterViews::GetInstance() {
return Singleton<AccessibilityEventRouterViews>::get();
}
bool AccessibilityEventRouterViews::AddViewTree(View* view, Profile* profile) {
if (view_tree_profile_map_[view] != NULL)
return false;
view_tree_profile_map_[view] = profile;
FocusManager* focus_manager = view->GetFocusManager();
// Add this object as a listener for this focus manager, but use a ref
// count to ensure we only call AddFocusChangeListener on any given
// focus manager once. Note that hash_map<FocusManager*, int>::operator[]
// will initialize the ref count to zero if it's not already in the map.
if (focus_manager_ref_count_[focus_manager] == 0) {
focus_manager->AddFocusChangeListener(this);
}
focus_manager_ref_count_[focus_manager]++;
view_info_map_[view].focus_manager = focus_manager;
return true;
}
void AccessibilityEventRouterViews::RemoveViewTree(View* view) {
DCHECK(view_tree_profile_map_.find(view) !=
view_tree_profile_map_.end());
view_tree_profile_map_.erase(view);
// Decrement the ref count of the focus manager, and remove this object
// as a listener if the count reaches zero.
FocusManager* focus_manager = view_info_map_[view].focus_manager;
DCHECK(focus_manager);
focus_manager_ref_count_[focus_manager]--;
if (focus_manager_ref_count_[focus_manager] == 0) {
focus_manager->RemoveFocusChangeListener(this);
}
}
void AccessibilityEventRouterViews::IgnoreView(View* view) {
view_info_map_[view].ignore = true;
}
void AccessibilityEventRouterViews::SetViewName(View* view, std::string name) {
view_info_map_[view].name = name;
}
void AccessibilityEventRouterViews::RemoveView(View* view) {
DCHECK(view_info_map_.find(view) != view_info_map_.end());
view_info_map_.erase(view);
}
//
// views::FocusChangeListener
//
void AccessibilityEventRouterViews::FocusWillChange(
View* focused_before, View* focused_now) {
if (focused_now) {
DispatchAccessibilityNotification(
focused_now, NotificationType::ACCESSIBILITY_CONTROL_FOCUSED);
}
}
//
// Private methods
//
void AccessibilityEventRouterViews::FindView(
View* view, Profile** profile, bool* is_accessible) {
*is_accessible = false;
// First see if it's a descendant of an accessible view.
for (base::hash_map<View*, Profile*>::const_iterator iter =
view_tree_profile_map_.begin();
iter != view_tree_profile_map_.end();
++iter) {
if (iter->first->IsParentOf(view)) {
*is_accessible = true;
if (profile)
*profile = iter->second;
break;
}
}
if (!*is_accessible)
return;
// Now make sure it's not marked as a widget to be ignored.
base::hash_map<View*, ViewInfo>::const_iterator iter =
view_info_map_.find(view);
if (iter != view_info_map_.end() && iter->second.ignore)
*is_accessible = false;
}
std::string AccessibilityEventRouterViews::GetViewName(View* view) {
std::string name;
// First see if we have a name registered for this view.
base::hash_map<View*, ViewInfo>::const_iterator iter =
view_info_map_.find(view);
if (iter != view_info_map_.end())
name = iter->second.name;
// Otherwise ask the view for its accessible name.
if (name.empty()) {
std::wstring wname;
view->GetAccessibleName(&wname);
name = WideToUTF8(wname);
}
return name;
}
void AccessibilityEventRouterViews::DispatchAccessibilityNotification(
View* view, NotificationType type) {
Profile* profile = NULL;
bool is_accessible;
FindView(view, &profile, &is_accessible);
if (!is_accessible)
return;
if (view->GetClassName() == views::ImageButton::kViewClassName) {
SendButtonNotification(view, type, profile);
} else if (view->GetClassName() == views::NativeButton::kViewClassName) {
SendButtonNotification(view, type, profile);
} else if (view->GetClassName() == views::Link::kViewClassName) {
SendLinkNotification(view, type, profile);
} else if (view->GetClassName() == views::MenuButton::kViewClassName) {
SendMenuNotification(view, type, profile);
}
}
void AccessibilityEventRouterViews::SendButtonNotification(
View* view, NotificationType type, Profile* profile) {
AccessibilityButtonInfo info(profile, GetViewName(view));
SendAccessibilityNotification(type, &info);
}
void AccessibilityEventRouterViews::SendLinkNotification(
View* view, NotificationType type, Profile* profile) {
AccessibilityLinkInfo info(profile, GetViewName(view));
SendAccessibilityNotification(type, &info);
}
void AccessibilityEventRouterViews::SendMenuNotification(
View* view, NotificationType type, Profile* profile) {
AccessibilityMenuInfo info(profile, GetViewName(view));
SendAccessibilityNotification(type, &info);
}
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