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