ui/views/accessibility/native_view_accessibility.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/views/accessibility/native_view_accessibility.h"
   6
   7 #include "base/strings/utf_string_conversions.h"
   8 #include "ui/accessibility/ax_view_state.h"
   9 #include "ui/events/event_utils.h"
  10 #include "ui/views/controls/native/native_view_host.h"
  11 #include "ui/views/view.h"
  12 #include "ui/views/widget/widget.h"
  13
  14 namespace views {
  15
  16 #if !defined(OS_WIN) && !(defined(OS_LINUX) && !defined(OS_CHROMEOS))
  17 // static
  18 NativeViewAccessibility* NativeViewAccessibility::Create(View* view) {
  19   return new NativeViewAccessibility(view);
  20 }
  21 #endif
  22
  23 NativeViewAccessibility::NativeViewAccessibility(View* view)
  24     : view_(view),
  25       parent_widget_(nullptr),
  26       ax_node_(nullptr) {
  27   ax_node_ = ui::AXPlatformNode::Create(this);
  28 }
  29
  30 NativeViewAccessibility::~NativeViewAccessibility() {
  31   if (ax_node_)
  32     ax_node_->Destroy();
  33   if (parent_widget_)
  34     parent_widget_->RemoveObserver(this);
  35 }
  36
  37 gfx::NativeViewAccessible NativeViewAccessibility::GetNativeObject() {
  38   return ax_node_ ? ax_node_->GetNativeViewAccessible() : nullptr;
  39 }
  40
  41 void NativeViewAccessibility::Destroy() {
  42   delete this;
  43 }
  44
  45 void NativeViewAccessibility::NotifyAccessibilityEvent(ui::AXEvent event_type) {
  46   if (ax_node_)
  47     ax_node_->NotifyAccessibilityEvent(event_type);
  48 }
  49
  50 // ui::AXPlatformNodeDelegate
  51
  52 const ui::AXNodeData& NativeViewAccessibility::GetData() {
  53   ui::AXViewState state;
  54   view_->GetAccessibleState(&state);
  55   data_ = ui::AXNodeData();
  56   data_.role = state.role;
  57   data_.state = state.state();
  58   data_.location = view_->GetBoundsInScreen();
  59   data_.AddStringAttribute(ui::AX_ATTR_NAME, base::UTF16ToUTF8(state.name));
  60   data_.AddStringAttribute(ui::AX_ATTR_VALUE, base::UTF16ToUTF8(state.value));
  61   data_.AddStringAttribute(ui::AX_ATTR_ACTION,
  62                            base::UTF16ToUTF8(state.default_action));
  63   data_.AddStringAttribute(ui::AX_ATTR_SHORTCUT,
  64                            base::UTF16ToUTF8(state.keyboard_shortcut));
  65   data_.AddIntAttribute(ui::AX_ATTR_TEXT_SEL_START, state.selection_start);
  66   data_.AddIntAttribute(ui::AX_ATTR_TEXT_SEL_END, state.selection_end);
  67
  68   data_.state |= (1 << ui::AX_STATE_FOCUSABLE);
  69
  70   if (!view_->enabled())
  71     data_.state |= (1 << ui::AX_STATE_DISABLED);
  72
  73   if (!view_->visible())
  74     data_.state |= (1 << ui::AX_STATE_INVISIBLE);
  75
  76   if (view_->HasFocus())
  77     data_.state |= (1 << ui::AX_STATE_FOCUSED);
  78
  79   return data_;
  80 }
  81
  82 int NativeViewAccessibility::GetChildCount() {
  83   int child_count = view_->child_count();
  84
  85   std::vector<Widget*> child_widgets;
  86   PopulateChildWidgetVector(&child_widgets);
  87   child_count += child_widgets.size();
  88
  89   return child_count;
  90 }
  91
  92 gfx::NativeViewAccessible NativeViewAccessibility::ChildAtIndex(int index) {
  93   // If this is a root view, our widget might have child widgets. Include
  94   std::vector<Widget*> child_widgets;
  95   PopulateChildWidgetVector(&child_widgets);
  96   int child_widget_count = static_cast<int>(child_widgets.size());
  97
  98   if (index < view_->child_count()) {
  99     return view_->child_at(index)->GetNativeViewAccessible();
 100   } else if (index < view_->child_count() + child_widget_count) {
 101     Widget* child_widget = child_widgets[index - view_->child_count()];
 102     return child_widget->GetRootView()->GetNativeViewAccessible();
 103   }
 104
 105   return nullptr;
 106 }
 107
 108 gfx::NativeViewAccessible NativeViewAccessibility::GetParent() {
 109   if (view_->parent())
 110     return view_->parent()->GetNativeViewAccessible();
 111
 112   // TODO: move this to NativeViewAccessibilityMac.
 113 #if defined(OS_MACOSX)
 114   if (view_->GetWidget())
 115     return view_->GetWidget()->GetNativeView();
 116 #endif
 117
 118   if (parent_widget_)
 119     return parent_widget_->GetRootView()->GetNativeViewAccessible();
 120
 121   return nullptr;
 122 }
 123
 124 gfx::Vector2d NativeViewAccessibility::GetGlobalCoordinateOffset() {
 125   return gfx::Vector2d(0, 0);  // location is already in screen coordinates.
 126 }
 127
 128 gfx::NativeViewAccessible NativeViewAccessibility::HitTestSync(int x, int y) {
 129   if (!view_ || !view_->GetWidget())
 130     return nullptr;
 131
 132   // Search child widgets first, since they're on top in the z-order.
 133   std::vector<Widget*> child_widgets;
 134   PopulateChildWidgetVector(&child_widgets);
 135   for (Widget* child_widget : child_widgets) {
 136     View* child_root_view = child_widget->GetRootView();
 137     gfx::Point point(x, y);
 138     View::ConvertPointFromScreen(child_root_view, &point);
 139     if (child_root_view->HitTestPoint(point))
 140       return child_root_view->GetNativeViewAccessible();
 141   }
 142
 143   gfx::Point point(x, y);
 144   View::ConvertPointFromScreen(view_, &point);
 145   if (!view_->HitTestPoint(point))
 146     return nullptr;
 147
 148   // Check if the point is within any of the immediate children of this
 149   // view. We don't have to search further because AXPlatformNode will
 150   // do a recursive hit test if we return anything other than |this| or NULL.
 151   for (int i = view_->child_count() - 1; i >= 0; --i) {
 152     View* child_view = view_->child_at(i);
 153     if (!child_view->visible())
 154       continue;
 155
 156     gfx::Point point_in_child_coords(point);
 157     view_->ConvertPointToTarget(view_, child_view, &point_in_child_coords);
 158     if (child_view->HitTestPoint(point_in_child_coords))
 159       return child_view->GetNativeViewAccessible();
 160   }
 161
 162   // If it's not inside any of our children, it's inside this view.
 163   return GetNativeObject();
 164 }
 165
 166 gfx::NativeViewAccessible NativeViewAccessibility::GetFocus() {
 167   FocusManager* focus_manager = view_->GetFocusManager();
 168   View* focused_view =
 169       focus_manager ? focus_manager->GetFocusedView() : nullptr;
 170   return focused_view ? focused_view->GetNativeViewAccessible() : nullptr;
 171 }
 172
 173 gfx::AcceleratedWidget
 174 NativeViewAccessibility::GetTargetForNativeAccessibilityEvent() {
 175   return gfx::kNullAcceleratedWidget;
 176 }
 177
 178 void NativeViewAccessibility::DoDefaultAction() {
 179   gfx::Point center = view_->GetLocalBounds().CenterPoint();
 180   view_->OnMousePressed(ui::MouseEvent(ui::ET_MOUSE_PRESSED,
 181                                        center,
 182                                        center,
 183                                        ui::EventTimeForNow(),
 184                                        ui::EF_LEFT_MOUSE_BUTTON,
 185                                        ui::EF_LEFT_MOUSE_BUTTON));
 186   view_->OnMouseReleased(ui::MouseEvent(ui::ET_MOUSE_RELEASED,
 187                                         center,
 188                                         center,
 189                                         ui::EventTimeForNow(),
 190                                         ui::EF_LEFT_MOUSE_BUTTON,
 191                                         ui::EF_LEFT_MOUSE_BUTTON));
 192 }
 193
 194 bool NativeViewAccessibility::SetStringValue(const base::string16& new_value) {
 195   // Return an error if the view can't set the value.
 196   ui::AXViewState state;
 197   view_->GetAccessibleState(&state);
 198   if (state.set_value_callback.is_null())
 199     return false;
 200
 201   state.set_value_callback.Run(new_value);
 202   return true;
 203 }
 204
 205 void NativeViewAccessibility::OnWidgetDestroying(Widget* widget) {
 206   if (parent_widget_ == widget)
 207     parent_widget_ = nullptr;
 208 }
 209
 210 void NativeViewAccessibility::SetParentWidget(Widget* parent_widget) {
 211   if (parent_widget_)
 212     parent_widget_->RemoveObserver(this);
 213   parent_widget_ = parent_widget;
 214   parent_widget_->AddObserver(this);
 215 }
 216
 217 void NativeViewAccessibility::PopulateChildWidgetVector(
 218     std::vector<Widget*>* result_child_widgets) {
 219   // Only attach child widgets to the root view.
 220   Widget* widget = view_->GetWidget();
 221   if (!widget || widget->GetRootView() != view_)
 222     return;
 223
 224   std::set<Widget*> child_widgets;
 225   Widget::GetAllOwnedWidgets(widget->GetNativeView(), &child_widgets);
 226   for (auto iter = child_widgets.begin(); iter != child_widgets.end(); ++iter) {
 227     Widget* child_widget = *iter;
 228     DCHECK_NE(widget, child_widget);
 229
 230     if (!child_widget->IsVisible())
 231       continue;
 232
 233     if (widget->GetNativeWindowProperty(kWidgetNativeViewHostKey))
 234       continue;
 235
 236     gfx::NativeViewAccessible child_widget_accessible =
 237         child_widget->GetRootView()->GetNativeViewAccessible();
 238     ui::AXPlatformNode* child_widget_platform_node =
 239         ui::AXPlatformNode::FromNativeViewAccessible(child_widget_accessible);
 240     if (child_widget_platform_node) {
 241       NativeViewAccessibility* child_widget_view_accessibility =
 242           static_cast<NativeViewAccessibility*>(
 243               child_widget_platform_node->GetDelegate());
 244       if (child_widget_view_accessibility->parent_widget() != widget)
 245         child_widget_view_accessibility->SetParentWidget(widget);
 246     }
 247
 248     result_child_widgets->push_back(child_widget);
 249   }
 250 }
 251
 252 }  // namespace views