[Aura] Implement views-based applist.

ui/base/models/list_model_unittest.cc

+// Copyright (c) 2011 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/base/models/list_model.h"
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace ui {
+
+class FooItem {
+ public:
+  explicit FooItem(int id) : id_(id) {}
+
+  int id() const { return id_; }
+
+ private:
+  int id_;
+  DISALLOW_COPY_AND_ASSIGN(FooItem);
+};
+
+class ListModelTest : public testing::Test,
+                      public ListModelObserver {
+ public:
+  ListModelTest()
+      : added_count_(0),
+        removed_count_(0),
+        changed_count_(0) {
+  }
+
+  void ExpectCountsEqual(int added_count,
+                         int removed_count,
+                         int changed_count) {
+    EXPECT_EQ(added_count, added_count_);
+    EXPECT_EQ(removed_count, removed_count_);
+    EXPECT_EQ(changed_count, changed_count_);
+  }
+
+  void ClearCounts() {
+    added_count_ = removed_count_ = changed_count_ = 0;
+  }
+
+  // ListModelObserver implementation:
+  virtual void ListItemsAdded(int start, int count) OVERRIDE {
+    added_count_ += count;
+  }
+  virtual void ListItemsRemoved(int start, int count) OVERRIDE {
+    removed_count_ += count;
+  }
+  virtual void ListItemsChanged(int start, int count) OVERRIDE {
+    changed_count_ += count;
+  }
+
+ private:
+  int added_count_;
+  int removed_count_;
+  int changed_count_;
+
+  DISALLOW_COPY_AND_ASSIGN(ListModelTest);
+};
+
+TEST_F(ListModelTest, Add) {
+  ListModel<FooItem> model;
+  model.AddObserver(this);
+
+  // Append FooItem(0)
+  model.Add(new FooItem(0));
+  ExpectCountsEqual(1, 0, 0);
+
+  // Append FooItem(1)
+  model.Add(new FooItem(1));
+  ExpectCountsEqual(2, 0, 0);
+
+  // Insert FooItem(2) at position 0
+  model.AddAt(0, new FooItem(2));
+  ExpectCountsEqual(3, 0, 0);
+
+  // Total 3 items in mode.
+  EXPECT_EQ(3, model.item_count());
+
+  // First one should be FooItem(2), followed by FooItem(0) and FooItem(1)
+  EXPECT_EQ(2, model.item_at(0)->id());
+  EXPECT_EQ(0, model.item_at(1)->id());
+  EXPECT_EQ(1, model.item_at(2)->id());
+}
+
+TEST_F(ListModelTest, Remove) {
+  ListModel<FooItem> model;
+  model.AddObserver(this);
+
+  model.Add(new FooItem(0));
+  model.Add(new FooItem(1));
+  model.Add(new FooItem(2));
+
+  ClearCounts();
+
+  // Remove item at index 1 from model and release memory.
+  model.DeleteAt(1);
+  ExpectCountsEqual(0, 1, 0);
+
+  EXPECT_EQ(2, model.item_count());
+  EXPECT_EQ(0, model.item_at(0)->id());
+  EXPECT_EQ(2, model.item_at(1)->id());
+
+  // Remove all items from model and delete them.
+  model.DeleteAll();
+  ExpectCountsEqual(0, 3, 0);
+}
+
+TEST_F(ListModelTest, RemoveAll) {
+  ListModel<FooItem> model;
+  model.AddObserver(this);
+
+  scoped_ptr<FooItem> foo0(new FooItem(0));
+  scoped_ptr<FooItem> foo1(new FooItem(1));
+  scoped_ptr<FooItem> foo2(new FooItem(2));
+
+  model.Add(foo0.get());
+  model.Add(foo1.get());
+  model.Add(foo2.get());
+
+  ClearCounts();
+
+  // Remove all items and scoped_ptr above would release memory.
+  model.RemoveAll();
+  ExpectCountsEqual(0, 3, 0);
+}
+
+TEST_F(ListModelTest, FakeUpdate) {
+  ListModel<FooItem> model;
+  model.AddObserver(this);
+
+  model.Add(new FooItem(0));
+  model.Add(new FooItem(1));
+  model.Add(new FooItem(2));
+
+  ClearCounts();
+
+  model.NotifyItemsChanged(0, 1);
+  ExpectCountsEqual(0, 0, 1);
+
+  model.NotifyItemsChanged(1, 2);
+  ExpectCountsEqual(0, 0, 3);
+}
+
+}  // namespace ui