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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/base/models/list_model.h"
#include <stddef.h>
#include <memory>
#include "base/compiler_specific.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace ui {
class FooItem {
public:
explicit FooItem(int id) : id_(id) {}
FooItem(const FooItem&) = delete;
FooItem& operator=(const FooItem&) = delete;
int id() const { return id_; }
private:
int id_;
};
class ListModelTest : public testing::Test,
public ListModelObserver {
public:
ListModelTest()
: added_count_(0),
removed_count_(0),
moved_count_(0),
changed_count_(0) {
}
ListModelTest(const ListModelTest&) = delete;
ListModelTest& operator=(const ListModelTest&) = delete;
void ExpectCountsEqual(size_t added_count,
size_t removed_count,
size_t moved_count,
size_t changed_count) {
EXPECT_EQ(added_count, added_count_);
EXPECT_EQ(removed_count, removed_count_);
EXPECT_EQ(moved_count, moved_count_);
EXPECT_EQ(changed_count, changed_count_);
}
void ClearCounts() {
added_count_ = removed_count_ = moved_count_ = changed_count_ = 0;
}
// ListModelObserver implementation:
void ListItemsAdded(size_t start, size_t count) override {
added_count_ += count;
}
void ListItemsRemoved(size_t start, size_t count) override {
removed_count_ += count;
}
void ListItemMoved(size_t index, size_t target_index) override {
++moved_count_;
}
void ListItemsChanged(size_t start, size_t count) override {
changed_count_ += count;
}
private:
size_t added_count_;
size_t removed_count_;
size_t moved_count_;
size_t changed_count_;
};
TEST_F(ListModelTest, Add) {
ListModel<FooItem> model;
model.AddObserver(this);
// Append FooItem(0)
model.Add(std::make_unique<FooItem>(0));
ExpectCountsEqual(1, 0, 0, 0);
// Append FooItem(1)
model.Add(std::make_unique<FooItem>(1));
ExpectCountsEqual(2, 0, 0, 0);
// Insert FooItem(2) at position 0
model.AddAt(0, std::make_unique<FooItem>(2));
ExpectCountsEqual(3, 0, 0, 0);
// Total 3 items in model.
EXPECT_EQ(3U, model.item_count());
// First one should be FooItem(2), followed by FooItem(0) and FooItem(1)
EXPECT_EQ(2, model.GetItemAt(0)->id());
EXPECT_EQ(0, model.GetItemAt(1)->id());
EXPECT_EQ(1, model.GetItemAt(2)->id());
}
TEST_F(ListModelTest, Remove) {
ListModel<FooItem> model;
model.AddObserver(this);
model.Add(std::make_unique<FooItem>(0));
model.Add(std::make_unique<FooItem>(1));
model.Add(std::make_unique<FooItem>(2));
ClearCounts();
// Remove item at index 1 from model and release memory.
model.DeleteAt(1);
ExpectCountsEqual(0, 1, 0, 0);
EXPECT_EQ(2U, model.item_count());
EXPECT_EQ(0, model.GetItemAt(0)->id());
EXPECT_EQ(2, model.GetItemAt(1)->id());
// Remove all items from model and delete them.
model.DeleteAll();
ExpectCountsEqual(0, 3, 0, 0);
}
TEST_F(ListModelTest, DeleteAll) {
ListModel<FooItem> model;
model.AddObserver(this);
model.Add(std::make_unique<FooItem>(0));
model.Add(std::make_unique<FooItem>(1));
model.Add(std::make_unique<FooItem>(2));
ClearCounts();
// Delete all items.
model.DeleteAll();
ExpectCountsEqual(0, 3, 0, 0);
}
TEST_F(ListModelTest, Move) {
ListModel<FooItem> model;
model.AddObserver(this);
model.Add(std::make_unique<FooItem>(0));
model.Add(std::make_unique<FooItem>(1));
model.Add(std::make_unique<FooItem>(2));
ClearCounts();
// Moves item at index 0 to index 2.
model.Move(0, 2);
ExpectCountsEqual(0, 0, 1, 0);
EXPECT_EQ(1, model.GetItemAt(0)->id());
EXPECT_EQ(2, model.GetItemAt(1)->id());
EXPECT_EQ(0, model.GetItemAt(2)->id());
}
TEST_F(ListModelTest, FakeUpdate) {
ListModel<FooItem> model;
model.AddObserver(this);
model.Add(std::make_unique<FooItem>(0));
model.Add(std::make_unique<FooItem>(1));
model.Add(std::make_unique<FooItem>(2));
ClearCounts();
model.NotifyItemsChanged(0, 1);
ExpectCountsEqual(0, 0, 0, 1);
model.NotifyItemsChanged(1, 2);
ExpectCountsEqual(0, 0, 0, 3);
}
} // namespace ui
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