ui/accessibility/ax_tree_update.cc

   1 // Copyright 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/accessibility/ax_tree_update.h"
   6
   7 #include "base/containers/hash_tables.h"
   8 #include "base/strings/string_number_conversions.h"
   9
  10 namespace ui {
  11
  12 AXTreeUpdate::AXTreeUpdate() : node_id_to_clear(0) {
  13 }
  14
  15 AXTreeUpdate::~AXTreeUpdate() {
  16 }
  17
  18 std::string AXTreeUpdate::ToString() const {
  19   std::string result;
  20   if (node_id_to_clear != 0) {
  21     result += "AXTreeUpdate: clear node " +
  22         base::IntToString(node_id_to_clear) + "\n";
  23   }
  24
  25   // The challenge here is that we want to indent the nodes being updated
  26   // so that parent/child relationships are clear, but we don't have access
  27   // to the rest of the tree for context, so we have to try to show the
  28   // relative indentation of child nodes in this update relative to their
  29   // parents.
  30   base::hash_map<int32, int> id_to_indentation;
  31   for (size_t i = 0; i < nodes.size(); ++i) {
  32     int indent = id_to_indentation[nodes[i].id];
  33     result += std::string(2 * indent, ' ');
  34     result += nodes[i].ToString() + "\n";
  35     for (size_t j = 0; j < nodes[i].child_ids.size(); ++j)
  36       id_to_indentation[nodes[i].child_ids[j]] = indent + 1;
  37   }
  38
  39   return result;
  40 }
  41
  42 }  // namespace ui