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// 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"
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_->set_focusable(true);
remove_ = new LabelButton(this, ASCIIToUTF16("Remove"));
remove_->set_focusable(true);
change_title_ = new LabelButton(this, ASCIIToUTF16("Change Title"));
change_title_->set_focusable(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::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));
if (context_menu_runner_->RunMenuAt(source->GetWidget(), NULL,
gfx::Rect(point, gfx::Size()), MenuItemView::TOPLEFT, 0) ==
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
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