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// Copyright (c) 2013 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/app_list/app_list_item_list.h"
#include "ui/app_list/app_list_item.h"
namespace app_list {
AppListItemList::AppListItemList() {
}
AppListItemList::~AppListItemList() {
}
void AppListItemList::AddObserver(AppListItemListObserver* observer) {
observers_.AddObserver(observer);
}
void AppListItemList::RemoveObserver(AppListItemListObserver* observer) {
observers_.RemoveObserver(observer);
}
AppListItem* AppListItemList::FindItem(const std::string& id) {
for (size_t i = 0; i < app_list_items_.size(); ++i) {
AppListItem* item = app_list_items_[i];
if (item->id() == id)
return item;
}
return NULL;
}
bool AppListItemList::FindItemIndex(const std::string& id, size_t* index) {
for (size_t i = 0; i < app_list_items_.size(); ++i) {
AppListItem* item = app_list_items_[i];
if (item->id() == id) {
*index = i;
return true;
}
}
return false;
}
size_t AppListItemList::AddItem(AppListItem* item) {
CHECK(std::find(app_list_items_.begin(), app_list_items_.end(), item)
== app_list_items_.end());
EnsureValidItemPosition(item);
size_t index = GetItemSortOrderIndex(item->position(), item->id());
app_list_items_.insert(app_list_items_.begin() + index, item);
FOR_EACH_OBSERVER(AppListItemListObserver,
observers_,
OnListItemAdded(index, item));
return index;
}
void AppListItemList::InsertItemAt(AppListItem* item, size_t index) {
DCHECK_LE(index, item_count());
if (item_count() == 0) {
AddItem(item);
return;
}
AppListItem* prev = index > 0 ? app_list_items_[index - 1] : NULL;
AppListItem* next = index <= app_list_items_.size() - 1 ?
app_list_items_[index] : NULL;
CHECK_NE(prev, next);
if (prev && next && prev->position().Equals(next->position()))
prev = NULL;
if (!prev)
item->set_position(next->position().CreateBefore());
else if (!next)
item->set_position(prev->position().CreateAfter());
else
item->set_position(prev->position().CreateBetween(next->position()));
app_list_items_.insert(app_list_items_.begin() + index, item);
FOR_EACH_OBSERVER(AppListItemListObserver,
observers_,
OnListItemAdded(index, item));
}
void AppListItemList::DeleteItem(const std::string& id) {
scoped_ptr<AppListItem> item = RemoveItem(id);
// |item| will be deleted on destruction.
}
void AppListItemList::DeleteItemsByType(const char* type) {
for (int i = static_cast<int>(app_list_items_.size()) - 1;
i >= 0; --i) {
AppListItem* item = app_list_items_[i];
if (!type || item->GetAppType() == type)
DeleteItemAt(i);
}
}
scoped_ptr<AppListItem> AppListItemList::RemoveItem(
const std::string& id) {
size_t index;
if (FindItemIndex(id, &index))
return RemoveItemAt(index);
return scoped_ptr<AppListItem>();
}
scoped_ptr<AppListItem> AppListItemList::RemoveItemAt(size_t index) {
DCHECK_LT(index, item_count());
AppListItem* item = app_list_items_[index];
app_list_items_.weak_erase(app_list_items_.begin() + index);
FOR_EACH_OBSERVER(AppListItemListObserver,
observers_,
OnListItemRemoved(index, item));
return make_scoped_ptr<AppListItem>(item);
}
void AppListItemList::MoveItem(size_t from_index, size_t to_index) {
DCHECK_LT(from_index, item_count());
DCHECK_LT(to_index, item_count());
if (from_index == to_index)
return;
AppListItem* target_item = app_list_items_[from_index];
app_list_items_.weak_erase(app_list_items_.begin() + from_index);
app_list_items_.insert(app_list_items_.begin() + to_index, target_item);
// Update position
AppListItem* prev = to_index > 0 ? app_list_items_[to_index - 1] : NULL;
AppListItem* next = to_index < app_list_items_.size() - 1 ?
app_list_items_[to_index + 1] : NULL;
CHECK_NE(prev, next);
// It is possible that items were added with the same ordinal. Rather than
// resolving a potentially complicated chain of conflicts, just set the
// ordinal before |next| (which will place it before both items).
if (prev && next && prev->position().Equals(next->position()))
prev = NULL;
syncer::StringOrdinal new_position;
if (!prev)
new_position = next->position().CreateBefore();
else if (!next)
new_position = prev->position().CreateAfter();
else
new_position = prev->position().CreateBetween(next->position());
VLOG(2) << "Move: " << target_item->position().ToDebugString()
<< " Prev: " << (prev ? prev->position().ToDebugString() : "(none)")
<< " Next: " << (next ? next->position().ToDebugString() : "(none)")
<< " -> " << new_position.ToDebugString();
target_item->set_position(new_position);
FOR_EACH_OBSERVER(AppListItemListObserver,
observers_,
OnListItemMoved(from_index, to_index, target_item));
}
void AppListItemList::SetItemPosition(
AppListItem* item,
const syncer::StringOrdinal& new_position) {
DCHECK(item);
size_t from_index;
if (!FindItemIndex(item->id(), &from_index)) {
LOG(ERROR) << "SetItemPosition: Not in list: " << item->id().substr(0, 8);
return;
}
DCHECK(app_list_items_[from_index] == item);
// First check if the order would remain the same, in which case just update
// the position.
size_t to_index = GetItemSortOrderIndex(new_position, item->id());
if (to_index == from_index) {
VLOG(2) << "SetItemPosition: No change: " << item->id().substr(0, 8);
item->set_position(new_position);
return;
}
// Remove the item and get the updated to index.
app_list_items_.weak_erase(app_list_items_.begin() + from_index);
to_index = GetItemSortOrderIndex(new_position, item->id());
VLOG(2) << "SetItemPosition: " << item->id().substr(0, 8)
<< " -> " << new_position.ToDebugString()
<< " From: " << from_index << " To: " << to_index;
item->set_position(new_position);
app_list_items_.insert(app_list_items_.begin() + to_index, item);
FOR_EACH_OBSERVER(AppListItemListObserver,
observers_,
OnListItemMoved(from_index, to_index, item));
}
// AppListItemList private
void AppListItemList::DeleteItemAt(size_t index) {
scoped_ptr<AppListItem> item = RemoveItemAt(index);
// |item| will be deleted on destruction.
}
void AppListItemList::EnsureValidItemPosition(AppListItem* item) {
syncer::StringOrdinal position = item->position();
if (position.IsValid())
return;
size_t nitems = app_list_items_.size();
if (nitems == 0) {
position = syncer::StringOrdinal::CreateInitialOrdinal();
} else {
position = app_list_items_[nitems - 1]->position().CreateAfter();
}
item->set_position(position);
}
size_t AppListItemList::GetItemSortOrderIndex(
const syncer::StringOrdinal& position,
const std::string& id) {
DCHECK(position.IsValid());
for (size_t index = 0; index < app_list_items_.size(); ++index) {
if (position.LessThan(app_list_items_[index]->position()) ||
(position.Equals(app_list_items_[index]->position()) &&
(id < app_list_items_[index]->id()))) {
return index;
}
}
return app_list_items_.size();
}
} // namespace app_list
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