Added views::ViewModelT<T>, a type-safe template version of ViewModel.

ui/views/view_model.cc

-// 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 "ui/views/view_model.h"
-
-#include "base/logging.h"
-#include "ui/views/view.h"
-
-namespace views {
-
-ViewModel::ViewModel() {
-}
-
-ViewModel::~ViewModel() {
-  // view are owned by their parent, no need to delete them.
-}
-
-void ViewModel::Add(View* view, int index) {
-  DCHECK_LE(index, static_cast<int>(entries_.size()));
-  DCHECK_GE(index, 0);
-  Entry entry;
-  entry.view = view;
-  entries_.insert(entries_.begin() + index, entry);
-}
-
-void ViewModel::Remove(int index) {
-  if (index == -1)
-    return;
-
-  check_index(index);
-  entries_.erase(entries_.begin() + index);
-}
-
-void ViewModel::Move(int index, int target_index) {
-  DCHECK_LT(index, static_cast<int>(entries_.size()));
-  DCHECK_GE(index, 0);
-  DCHECK_LT(target_index, static_cast<int>(entries_.size()));
-  DCHECK_GE(target_index, 0);
-
-  if (index == target_index)
-    return;
-  Entry entry(entries_[index]);
-  entries_.erase(entries_.begin() + index);
-  entries_.insert(entries_.begin() + target_index, entry);
-}
-
-void ViewModel::MoveViewOnly(int index, int target_index) {
-  if (index == target_index)
-    return;
-  if (target_index < index) {
-    View* view = entries_[index].view;
-    for (int i = index; i > target_index; --i)
-      entries_[i].view = entries_[i - 1].view;
-    entries_[target_index].view = view;
-  } else {
-    View* view = entries_[index].view;
-    for (int i = index; i < target_index; ++i)
-      entries_[i].view = entries_[i + 1].view;
-    entries_[target_index].view = view;
-  }
-}
-
-void ViewModel::Clear() {
-  Entries entries;
-  entries.swap(entries_);
-  for (size_t i = 0; i < entries.size(); ++i)
-    delete entries[i].view;
-}
-
-int ViewModel::GetIndexOfView(const View* view) const {
-  for (size_t i = 0; i < entries_.size(); ++i) {
-    if (entries_[i].view == view)
-      return static_cast<int>(i);
-  }
-  return -1;
-}
-
-}  // namespace views