It is time.

ui/views/examples/tree_view_example.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/examples/tree_view_example.h"
-
-#include "base/strings/utf_string_conversions.h"
-#include "ui/views/controls/button/label_button.h"
-#include "ui/views/controls/menu/menu_model_adapter.h"
-#include "ui/views/controls/menu/menu_runner.h"
-#include "ui/views/controls/tree/tree_view.h"
-#include "ui/views/layout/grid_layout.h"
-
-using base::ASCIIToUTF16;
-
-namespace views {
-namespace examples {
-
-TreeViewExample::TreeViewExample()
-    : ExampleBase("Tree View"),
-      tree_view_(NULL),
-      model_(new NodeType(ASCIIToUTF16("root"), 1)) {
-}
-
-TreeViewExample::~TreeViewExample() {
-  // Delete the view before the model.
-  delete tree_view_;
-  tree_view_ = NULL;
-}
-
-void TreeViewExample::CreateExampleView(View* container) {
-  // Add some sample data.
-  NodeType* colors_node = new NodeType(ASCIIToUTF16("colors"), 1);
-  model_.GetRoot()->Add(colors_node, 0);
-  colors_node->Add(new NodeType(ASCIIToUTF16("red"), 1), 0);
-  colors_node->Add(new NodeType(ASCIIToUTF16("green"), 1), 1);
-  colors_node->Add(new NodeType(ASCIIToUTF16("blue"), 1), 2);
-
-  NodeType* sheep_node = new NodeType(ASCIIToUTF16("sheep"), 1);
-  model_.GetRoot()->Add(sheep_node, 0);
-  sheep_node->Add(new NodeType(ASCIIToUTF16("Sheep 1"), 1), 0);
-  sheep_node->Add(new NodeType(ASCIIToUTF16("Sheep 2"), 1), 1);
-
-  tree_view_ = new TreeView();
-  tree_view_->set_context_menu_controller(this);
-  tree_view_->SetRootShown(false);
-  tree_view_->SetModel(&model_);
-  tree_view_->SetController(this);
-  add_ = new LabelButton(this, ASCIIToUTF16("Add"));
-  add_->SetFocusable(true);
-  remove_ = new LabelButton(this, ASCIIToUTF16("Remove"));
-  remove_->SetFocusable(true);
-  change_title_ = new LabelButton(this, ASCIIToUTF16("Change Title"));
-  change_title_->SetFocusable(true);
-
-  GridLayout* layout = new GridLayout(container);
-  container->SetLayoutManager(layout);
-
-  const int tree_view_column = 0;
-  ColumnSet* column_set = layout->AddColumnSet(tree_view_column);
-  column_set->AddColumn(GridLayout::FILL, GridLayout::FILL,
-                        1.0f, GridLayout::USE_PREF, 0, 0);
-  layout->StartRow(1 /* expand */, tree_view_column);
-  layout->AddView(tree_view_->CreateParentIfNecessary());
-
-  // Add control buttons horizontally.
-  const int button_column = 1;
-  column_set = layout->AddColumnSet(button_column);
-  for (int i = 0; i < 3; i++) {
-    column_set->AddColumn(GridLayout::FILL, GridLayout::FILL,
-                          1.0f, GridLayout::USE_PREF, 0, 0);
-  }
-
-  layout->StartRow(0 /* no expand */, button_column);
-  layout->AddView(add_);
-  layout->AddView(remove_);
-  layout->AddView(change_title_);
-}
-
-void TreeViewExample::AddNewNode() {
-  NodeType* selected_node =
-      static_cast<NodeType*>(tree_view_->GetSelectedNode());
-  if (!selected_node)
-    selected_node = model_.GetRoot();
-  NodeType* new_node = new NodeType(selected_node->GetTitle(), 1);
-  model_.Add(selected_node, new_node, selected_node->child_count());
-  tree_view_->SetSelectedNode(new_node);
-}
-
-bool TreeViewExample::IsCommandIdEnabled(int command_id) {
-  return command_id != ID_REMOVE ||
-      tree_view_->GetSelectedNode() != model_.GetRoot();
-}
-
-void TreeViewExample::ButtonPressed(Button* sender, const ui::Event& event) {
-  NodeType* selected_node =
-      static_cast<NodeType*>(tree_view_->GetSelectedNode());
-  if (sender == add_) {
-    AddNewNode();
-  } else if (sender == remove_) {
-    DCHECK(selected_node);
-    DCHECK_NE(model_.GetRoot(), selected_node);
-    model_.Remove(selected_node->parent(), selected_node);
-  } else if (sender == change_title_) {
-    DCHECK(selected_node);
-    model_.SetTitle(selected_node,
-                    selected_node->GetTitle() + ASCIIToUTF16("new"));
-  }
-}
-
-void TreeViewExample::OnTreeViewSelectionChanged(TreeView* tree_view) {
-  ui::TreeModelNode* node = tree_view_->GetSelectedNode();
-  if (node) {
-    change_title_->SetEnabled(true);
-    remove_->SetEnabled(node != model_.GetRoot());
-  } else {
-    change_title_->SetEnabled(false);
-    remove_->SetEnabled(false);
-  }
-}
-
-bool TreeViewExample::CanEdit(TreeView* tree_view,
-                              ui::TreeModelNode* node) {
-  return true;
-}
-
-void TreeViewExample::ShowContextMenuForView(View* source,
-                                             const gfx::Point& point,
-                                             ui::MenuSourceType source_type) {
-  ui::SimpleMenuModel context_menu_model(this);
-  context_menu_model.AddItem(ID_EDIT, ASCIIToUTF16("Edit"));
-  context_menu_model.AddItem(ID_REMOVE, ASCIIToUTF16("Remove"));
-  context_menu_model.AddItem(ID_ADD, ASCIIToUTF16("Add"));
-  context_menu_runner_.reset(new MenuRunner(&context_menu_model, 0));
-  if (context_menu_runner_->RunMenuAt(source->GetWidget(),
-                                      NULL,
-                                      gfx::Rect(point, gfx::Size()),
-                                      MENU_ANCHOR_TOPLEFT,
-                                      source_type) ==
-      MenuRunner::MENU_DELETED) {
-    return;
-  }
-}
-
-bool TreeViewExample::IsCommandIdChecked(int command_id) const {
-  return false;
-}
-
-bool TreeViewExample::IsCommandIdEnabled(int command_id) const {
-  return const_cast<TreeViewExample*>(this)->IsCommandIdEnabled(command_id);
-}
-
-bool TreeViewExample::GetAcceleratorForCommandId(
-    int command_id,
-    ui::Accelerator* accelerator) {
-  return false;
-}
-
-void TreeViewExample::ExecuteCommand(int command_id, int event_flags) {
-  NodeType* selected_node =
-      static_cast<NodeType*>(tree_view_->GetSelectedNode());
-  switch (command_id) {
-    case ID_EDIT:
-      tree_view_->StartEditing(selected_node);
-      break;
-    case ID_REMOVE:
-      model_.Remove(selected_node->parent(), selected_node);
-      break;
-    case ID_ADD:
-      AddNewNode();
-      break;
-    default:
-      NOTREACHED();
-  }
-}
-
-}  // namespace examples
-}  // namespace views