Refactor RendererAccessibiltiyComplete back into RendererAccessibility.

content/renderer/accessibility/renderer_accessibility_complete.cc

Index: content/renderer/accessibility/renderer_accessibility_complete.cc
diff --git a/content/renderer/accessibility/renderer_accessibility_complete.cc b/content/renderer/accessibility/renderer_accessibility_complete.cc
deleted file mode 100644
index e09021138999317c0fb66e9b24aef6dee5a3bef1..0000000000000000000000000000000000000000
--- a/content/renderer/accessibility/renderer_accessibility_complete.cc
+++ /dev/null
@@ -1,454 +0,0 @@
-// Copyright (c) 2012 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 "content/renderer/accessibility/renderer_accessibility_complete.h"
-
-#include <queue>
-
-#include "base/bind.h"
-#include "base/message_loop/message_loop.h"
-#include "content/renderer/accessibility/blink_ax_enum_conversion.h"
-#include "content/renderer/render_frame_impl.h"
-#include "content/renderer/render_view_impl.h"
-#include "third_party/WebKit/public/web/WebAXObject.h"
-#include "third_party/WebKit/public/web/WebDocument.h"
-#include "third_party/WebKit/public/web/WebFrame.h"
-#include "third_party/WebKit/public/web/WebInputElement.h"
-#include "third_party/WebKit/public/web/WebLocalFrame.h"
-#include "third_party/WebKit/public/web/WebNode.h"
-#include "third_party/WebKit/public/web/WebSettings.h"
-#include "third_party/WebKit/public/web/WebView.h"
-#include "ui/accessibility/ax_tree.h"
-
-using blink::WebAXObject;
-using blink::WebDocument;
-using blink::WebFrame;
-using blink::WebNode;
-using blink::WebPoint;
-using blink::WebRect;
-using blink::WebSettings;
-using blink::WebView;
-
-namespace content {
-
-RendererAccessibilityComplete::RendererAccessibilityComplete(
-    RenderFrameImpl* render_frame)
-    : RendererAccessibility(render_frame),
-      tree_source_(render_frame),
-      serializer_(&tree_source_),
-      last_scroll_offset_(gfx::Size()),
-      ack_pending_(false),
-      reset_token_(0),
-      weak_factory_(this) {
-  WebView* web_view = render_frame_->GetRenderView()->GetWebView();
-  WebSettings* settings = web_view->settings();
-  settings->setAccessibilityEnabled(true);
-
-#if !defined(OS_ANDROID)
-  // Skip inline text boxes on Android - since there are no native Android
-  // APIs that compute the bounds of a range of text, it's a waste to
-  // include these in the AX tree.
-  settings->setInlineTextBoxAccessibilityEnabled(true);
-#endif
-
-  const WebDocument& document = GetMainDocument();
-  if (!document.isNull()) {
-    // It's possible that the webview has already loaded a webpage without
-    // accessibility being enabled. Initialize the browser's cached
-    // accessibility tree by sending it a notification.
-    HandleAXEvent(document.accessibilityObject(),
-                  ui::AX_EVENT_LAYOUT_COMPLETE);
-  }
-}
-
-RendererAccessibilityComplete::~RendererAccessibilityComplete() {
-}
-
-bool RendererAccessibilityComplete::OnMessageReceived(
-    const IPC::Message& message) {
-  bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP(RendererAccessibilityComplete, message)
-    IPC_MESSAGE_HANDLER(AccessibilityMsg_SetFocus, OnSetFocus)
-    IPC_MESSAGE_HANDLER(AccessibilityMsg_DoDefaultAction,
-                        OnDoDefaultAction)
-    IPC_MESSAGE_HANDLER(AccessibilityMsg_Events_ACK,
-                        OnEventsAck)
-    IPC_MESSAGE_HANDLER(AccessibilityMsg_ScrollToMakeVisible,
-                        OnScrollToMakeVisible)
-    IPC_MESSAGE_HANDLER(AccessibilityMsg_ScrollToPoint,
-                        OnScrollToPoint)
-    IPC_MESSAGE_HANDLER(AccessibilityMsg_SetTextSelection,
-                        OnSetTextSelection)
-    IPC_MESSAGE_HANDLER(AccessibilityMsg_HitTest, OnHitTest)
-    IPC_MESSAGE_HANDLER(AccessibilityMsg_Reset, OnReset)
-    IPC_MESSAGE_HANDLER(AccessibilityMsg_FatalError, OnFatalError)
-    IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP()
-  return handled;
-}
-
-void RendererAccessibilityComplete::FocusedNodeChanged(const WebNode& node) {
-  const WebDocument& document = GetMainDocument();
-  if (document.isNull())
-    return;
-
-  if (node.isNull()) {
-    // When focus is cleared, implicitly focus the document.
-    // TODO(dmazzoni): Make Blink send this notification instead.
-    HandleAXEvent(document.accessibilityObject(), ui::AX_EVENT_BLUR);
-  }
-}
-
-void RendererAccessibilityComplete::DisableAccessibility() {
-  RenderView* render_view = render_frame_->GetRenderView();
-  if (!render_view)
-    return;
-
-  WebView* web_view = render_view->GetWebView();
-  if (!web_view)
-    return;
-
-  WebSettings* settings = web_view->settings();
-  if (!settings)
-    return;
-
-  settings->setAccessibilityEnabled(false);
-}
-
-void RendererAccessibilityComplete::HandleWebAccessibilityEvent(
-    const blink::WebAXObject& obj, blink::WebAXEvent event) {
-  HandleAXEvent(obj, AXEventFromBlink(event));
-}
-
-void RendererAccessibilityComplete::HandleAXEvent(
-    const blink::WebAXObject& obj, ui::AXEvent event) {
-  const WebDocument& document = GetMainDocument();
-  if (document.isNull())
-    return;
-
-  gfx::Size scroll_offset = document.frame()->scrollOffset();
-  if (scroll_offset != last_scroll_offset_) {
-    // Make sure the browser is always aware of the scroll position of
-    // the root document element by posting a generic notification that
-    // will update it.
-    // TODO(dmazzoni): remove this as soon as
-    // https://bugs.webkit.org/show_bug.cgi?id=73460 is fixed.
-    last_scroll_offset_ = scroll_offset;
-    if (!obj.equals(document.accessibilityObject())) {
-      HandleAXEvent(document.accessibilityObject(),
-                    ui::AX_EVENT_LAYOUT_COMPLETE);
-    }
-  }
-
-  // Add the accessibility object to our cache and ensure it's valid.
-  AccessibilityHostMsg_EventParams acc_event;
-  acc_event.id = obj.axID();
-  acc_event.event_type = event;
-
-  // Discard duplicate accessibility events.
-  for (uint32 i = 0; i < pending_events_.size(); ++i) {
-    if (pending_events_[i].id == acc_event.id &&
-        pending_events_[i].event_type ==
-            acc_event.event_type) {
-      return;
-    }
-  }
-  pending_events_.push_back(acc_event);
-
-  if (!ack_pending_ && !weak_factory_.HasWeakPtrs()) {
-    // When no accessibility events are in-flight post a task to send
-    // the events to the browser. We use PostTask so that we can queue
-    // up additional events.
-    base::MessageLoop::current()->PostTask(
-        FROM_HERE,
-        base::Bind(&RendererAccessibilityComplete::
-                       SendPendingAccessibilityEvents,
-                   weak_factory_.GetWeakPtr()));
-  }
-}
-
-RendererAccessibilityType RendererAccessibilityComplete::GetType() {
-  return RendererAccessibilityTypeComplete;
-}
-
-void RendererAccessibilityComplete::SendPendingAccessibilityEvents() {
-  const WebDocument& document = GetMainDocument();
-  if (document.isNull())
-    return;
-
-  if (pending_events_.empty())
-    return;
-
-  if (render_frame_->is_swapped_out())
-    return;
-
-  ack_pending_ = true;
-
-  // Make a copy of the events, because it's possible that
-  // actions inside this loop will cause more events to be
-  // queued up.
-  std::vector<AccessibilityHostMsg_EventParams> src_events =
-      pending_events_;
-  pending_events_.clear();
-
-  // Generate an event message from each Blink event.
-  std::vector<AccessibilityHostMsg_EventParams> event_msgs;
-
-  // If there's a layout complete message, we need to send location changes.
-  bool had_layout_complete_messages = false;
-
-  // Loop over each event and generate an updated event message.
-  for (size_t i = 0; i < src_events.size(); ++i) {
-    AccessibilityHostMsg_EventParams& event = src_events[i];
-    if (event.event_type == ui::AX_EVENT_LAYOUT_COMPLETE)
-      had_layout_complete_messages = true;
-
-    WebAXObject obj = document.accessibilityObjectFromID(event.id);
-
-    // Make sure the object still exists.
-    if (!obj.updateLayoutAndCheckValidity())
-      continue;
-
-    // If it's ignored, find the first ancestor that's not ignored.
-    while (!obj.isDetached() && obj.accessibilityIsIgnored())
-      obj = obj.parentObject();
-
-    // Make sure it's a descendant of our root node - exceptions include the
-    // scroll area that's the parent of the main document (we ignore it), and
-    // possibly nodes attached to a different document.
-    if (!tree_source_.IsInTree(obj))
-      continue;
-
-    // When we get a "selected children changed" event, Blink
-    // doesn't also send us events for each child that changed
-    // selection state, so make sure we re-send that whole subtree.
-    if (event.event_type ==
-        ui::AX_EVENT_SELECTED_CHILDREN_CHANGED) {
-      serializer_.DeleteClientSubtree(obj);
-    }
-
-    AccessibilityHostMsg_EventParams event_msg;
-    tree_source_.CollectChildFrameIdMapping(
-        &event_msg.node_to_frame_routing_id_map,
-        &event_msg.node_to_browser_plugin_instance_id_map);
-    event_msg.event_type = event.event_type;
-    event_msg.id = event.id;
-    serializer_.SerializeChanges(obj, &event_msg.update);
-    event_msgs.push_back(event_msg);
-
-    // For each node in the update, set the location in our map from
-    // ids to locations.
-    for (size_t i = 0; i < event_msg.update.nodes.size(); ++i) {
-      locations_[event_msg.update.nodes[i].id] =
-          event_msg.update.nodes[i].location;
-    }
-
-    VLOG(0) << "Accessibility event: " << ui::ToString(event.event_type)
-            << " on node id " << event_msg.id
-            << "\n" << event_msg.update.ToString();
-  }
-
-  Send(new AccessibilityHostMsg_Events(routing_id(), event_msgs, reset_token_));
-  reset_token_ = 0;
-
-  if (had_layout_complete_messages)
-    SendLocationChanges();
-}
-
-void RendererAccessibilityComplete::SendLocationChanges() {
-  std::vector<AccessibilityHostMsg_LocationChangeParams> messages;
-
-  // Do a breadth-first explore of the whole blink AX tree.
-  base::hash_map<int, gfx::Rect> new_locations;
-  std::queue<WebAXObject> objs_to_explore;
-  objs_to_explore.push(tree_source_.GetRoot());
-  while (objs_to_explore.size()) {
-    WebAXObject obj = objs_to_explore.front();
-    objs_to_explore.pop();
-
-    // See if we had a previous location. If not, this whole subtree must
-    // be new, so don't continue to explore this branch.
-    int id = obj.axID();
-    base::hash_map<int, gfx::Rect>::iterator iter = locations_.find(id);
-    if (iter == locations_.end())
-      continue;
-
-    // If the location has changed, append it to the IPC message.
-    gfx::Rect new_location = obj.boundingBoxRect();
-    if (iter != locations_.end() && iter->second != new_location) {
-      AccessibilityHostMsg_LocationChangeParams message;
-      message.id = id;
-      message.new_location = new_location;
-      messages.push_back(message);
-    }
-
-    // Save the new location.
-    new_locations[id] = new_location;
-
-    // Explore children of this object.
-    std::vector<blink::WebAXObject> children;
-    tree_source_.GetChildren(obj, &children);
-    for (size_t i = 0; i < children.size(); ++i)
-      objs_to_explore.push(children[i]);
-  }
-  locations_.swap(new_locations);
-
-  Send(new AccessibilityHostMsg_LocationChanges(routing_id(), messages));
-}
-
-void RendererAccessibilityComplete::OnDoDefaultAction(int acc_obj_id) {
-  const WebDocument& document = GetMainDocument();
-  if (document.isNull())
-    return;
-
-  WebAXObject obj = document.accessibilityObjectFromID(acc_obj_id);
-  if (obj.isDetached()) {
-#ifndef NDEBUG
-    LOG(WARNING) << "DoDefaultAction on invalid object id " << acc_obj_id;
-#endif
-    return;
-  }
-
-  obj.performDefaultAction();
-}
-
-void RendererAccessibilityComplete::OnScrollToMakeVisible(
-    int acc_obj_id, gfx::Rect subfocus) {
-  const WebDocument& document = GetMainDocument();
-  if (document.isNull())
-    return;
-
-  WebAXObject obj = document.accessibilityObjectFromID(acc_obj_id);
-  if (obj.isDetached()) {
-#ifndef NDEBUG
-    LOG(WARNING) << "ScrollToMakeVisible on invalid object id " << acc_obj_id;
-#endif
-    return;
-  }
-
-  obj.scrollToMakeVisibleWithSubFocus(
-      WebRect(subfocus.x(), subfocus.y(),
-              subfocus.width(), subfocus.height()));
-
-  // Make sure the browser gets an event when the scroll
-  // position actually changes.
-  // TODO(dmazzoni): remove this once this bug is fixed:
-  // https://bugs.webkit.org/show_bug.cgi?id=73460
-  HandleAXEvent(document.accessibilityObject(),
-                ui::AX_EVENT_LAYOUT_COMPLETE);
-}
-
-void RendererAccessibilityComplete::OnScrollToPoint(
-    int acc_obj_id, gfx::Point point) {
-  const WebDocument& document = GetMainDocument();
-  if (document.isNull())
-    return;
-
-  WebAXObject obj = document.accessibilityObjectFromID(acc_obj_id);
-  if (obj.isDetached()) {
-#ifndef NDEBUG
-    LOG(WARNING) << "ScrollToPoint on invalid object id " << acc_obj_id;
-#endif
-    return;
-  }
-
-  obj.scrollToGlobalPoint(WebPoint(point.x(), point.y()));
-
-  // Make sure the browser gets an event when the scroll
-  // position actually changes.
-  // TODO(dmazzoni): remove this once this bug is fixed:
-  // https://bugs.webkit.org/show_bug.cgi?id=73460
-  HandleAXEvent(document.accessibilityObject(),
-                ui::AX_EVENT_LAYOUT_COMPLETE);
-}
-
-void RendererAccessibilityComplete::OnSetTextSelection(
-    int acc_obj_id, int start_offset, int end_offset) {
-  const WebDocument& document = GetMainDocument();
-  if (document.isNull())
-    return;
-
-  WebAXObject obj = document.accessibilityObjectFromID(acc_obj_id);
-  if (obj.isDetached()) {
-#ifndef NDEBUG
-    LOG(WARNING) << "SetTextSelection on invalid object id " << acc_obj_id;
-#endif
-    return;
-  }
-
-  // TODO(dmazzoni): support elements other than <input>.
-  blink::WebNode node = obj.node();
-  if (!node.isNull() && node.isElementNode()) {
-    blink::WebElement element = node.to<blink::WebElement>();
-    blink::WebInputElement* input_element =
-        blink::toWebInputElement(&element);
-    if (input_element && input_element->isTextField())
-      input_element->setSelectionRange(start_offset, end_offset);
-  }
-}
-
-void RendererAccessibilityComplete::OnHitTest(gfx::Point point) {
-  const WebDocument& document = GetMainDocument();
-  if (document.isNull())
-    return;
-  WebAXObject root_obj = document.accessibilityObject();
-  if (!root_obj.updateLayoutAndCheckValidity())
-    return;
-
-  WebAXObject obj = root_obj.hitTest(point);
-  if (!obj.isDetached())
-    HandleAXEvent(obj, ui::AX_EVENT_HOVER);
-}
-
-void RendererAccessibilityComplete::OnEventsAck() {
-  DCHECK(ack_pending_);
-  ack_pending_ = false;
-  SendPendingAccessibilityEvents();
-}
-
-void RendererAccessibilityComplete::OnSetFocus(int acc_obj_id) {
-  const WebDocument& document = GetMainDocument();
-  if (document.isNull())
-    return;
-
-  WebAXObject obj = document.accessibilityObjectFromID(acc_obj_id);
-  if (obj.isDetached()) {
-#ifndef NDEBUG
-    LOG(WARNING) << "OnSetAccessibilityFocus on invalid object id "
-                 << acc_obj_id;
-#endif
-    return;
-  }
-
-  WebAXObject root = document.accessibilityObject();
-  if (root.isDetached()) {
-#ifndef NDEBUG
-    LOG(WARNING) << "OnSetAccessibilityFocus but root is invalid";
-#endif
-    return;
-  }
-
-  // By convention, calling SetFocus on the root of the tree should clear the
-  // current focus. Otherwise set the focus to the new node.
-  if (acc_obj_id == root.axID())
-    render_frame_->GetRenderView()->GetWebView()->clearFocusedElement();
-  else
-    obj.setFocused(true);
-}
-
-void RendererAccessibilityComplete::OnReset(int reset_token) {
-  reset_token_ = reset_token;
-  serializer_.Reset();
-  pending_events_.clear();
-
-  const WebDocument& document = GetMainDocument();
-  if (!document.isNull())
-    HandleAXEvent(document.accessibilityObject(), ui::AX_EVENT_LAYOUT_COMPLETE);
-}
-
-void RendererAccessibilityComplete::OnFatalError() {
-  CHECK(false) << "Invalid accessibility tree.";
-}
-
-}  // namespace content