Pulls display related changes from mojo to chrome

mojo/services/view_manager/server_view_drawn_tracker_unittest.cc

+// Copyright 2015 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 "mojo/services/view_manager/server_view_drawn_tracker.h"
+
+#include "mojo/services/view_manager/server_view.h"
+#include "mojo/services/view_manager/server_view_drawn_tracker_observer.h"
+#include "mojo/services/view_manager/test_server_view_delegate.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace view_manager {
+namespace {
+
+class TestServerViewDrawnTrackerObserver
+    : public ServerViewDrawnTrackerObserver {
+ public:
+  TestServerViewDrawnTrackerObserver()
+      : change_count_(0u),
+        ancestor_(nullptr),
+        view_(nullptr),
+        is_drawn_(false) {}
+
+  void clear_change_count() { change_count_ = 0u; }
+  size_t change_count() const { return change_count_; }
+  const ServerView* ancestor() const { return ancestor_; }
+  const ServerView* view() const { return view_; }
+  bool is_drawn() const { return is_drawn_; }
+
+ private:
+  // ServerViewDrawnTrackerObserver:
+  void OnDrawnStateChanged(ServerView* ancestor,
+                           ServerView* view,
+                           bool is_drawn) override {
+    change_count_++;
+    ancestor_ = ancestor;
+    view_ = view;
+    is_drawn_ = is_drawn;
+  }
+
+  size_t change_count_;
+  const ServerView* ancestor_;
+  const ServerView* view_;
+  bool is_drawn_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestServerViewDrawnTrackerObserver);
+};
+
+}  // namespace
+
+TEST(ServerViewDrawnTrackerTest, ChangeBecauseOfDeletionAndVisibility) {
+  TestServerViewDelegate server_view_delegate;
+  scoped_ptr<ServerView> view(new ServerView(&server_view_delegate, ViewId()));
+  TestServerViewDrawnTrackerObserver drawn_observer;
+  ServerViewDrawnTracker tracker(view.get(), view.get(), &drawn_observer);
+  view->SetVisible(true);
+  EXPECT_EQ(1u, drawn_observer.change_count());
+  EXPECT_EQ(view.get(), drawn_observer.view());
+  EXPECT_EQ(nullptr, drawn_observer.ancestor());
+  EXPECT_TRUE(drawn_observer.is_drawn());
+  drawn_observer.clear_change_count();
+
+  view->SetVisible(false);
+  EXPECT_EQ(1u, drawn_observer.change_count());
+  EXPECT_EQ(view.get(), drawn_observer.view());
+  EXPECT_EQ(nullptr, drawn_observer.ancestor());
+  EXPECT_FALSE(drawn_observer.is_drawn());
+  drawn_observer.clear_change_count();
+
+  view->SetVisible(true);
+  EXPECT_EQ(1u, drawn_observer.change_count());
+  EXPECT_EQ(view.get(), drawn_observer.view());
+  EXPECT_EQ(nullptr, drawn_observer.ancestor());
+  EXPECT_TRUE(drawn_observer.is_drawn());
+  drawn_observer.clear_change_count();
+
+  view.reset();
+  EXPECT_EQ(1u, drawn_observer.change_count());
+  EXPECT_EQ(view.get(), drawn_observer.view());
+  EXPECT_EQ(nullptr, drawn_observer.ancestor());
+  EXPECT_FALSE(drawn_observer.is_drawn());
+}
+
+TEST(ServerViewDrawnTrackerTest, ChangeBecauseOfRemovingFromRoot) {
+  TestServerViewDelegate server_view_delegate;
+  ServerView root(&server_view_delegate, ViewId());
+  root.SetVisible(true);
+  ServerView child(&server_view_delegate, ViewId());
+  child.SetVisible(true);
+  root.Add(&child);
+
+  TestServerViewDrawnTrackerObserver drawn_observer;
+  ServerViewDrawnTracker tracker(&root, &child, &drawn_observer);
+  root.Remove(&child);
+  EXPECT_EQ(1u, drawn_observer.change_count());
+  EXPECT_EQ(&child, drawn_observer.view());
+  EXPECT_EQ(&root, drawn_observer.ancestor());
+  EXPECT_FALSE(drawn_observer.is_drawn());
+  drawn_observer.clear_change_count();
+
+  root.Add(&child);
+  EXPECT_EQ(1u, drawn_observer.change_count());
+  EXPECT_EQ(&child, drawn_observer.view());
+  EXPECT_EQ(nullptr, drawn_observer.ancestor());
+  EXPECT_TRUE(drawn_observer.is_drawn());
+}
+
+TEST(ServerViewDrawnTrackerTest, ChangeBecauseOfRemovingAncestorFromRoot) {
+  TestServerViewDelegate server_view_delegate;
+  ServerView root(&server_view_delegate, ViewId());
+  root.SetVisible(true);
+  ServerView child(&server_view_delegate, ViewId());
+  child.SetVisible(true);
+  root.Add(&child);
+
+  ServerView child_child(&server_view_delegate, ViewId());
+  child_child.SetVisible(true);
+  child.Add(&child_child);
+
+  TestServerViewDrawnTrackerObserver drawn_observer;
+  ServerViewDrawnTracker tracker(&root, &child_child, &drawn_observer);
+  root.Remove(&child);
+  EXPECT_EQ(1u, drawn_observer.change_count());
+  EXPECT_EQ(&child_child, drawn_observer.view());
+  EXPECT_EQ(&root, drawn_observer.ancestor());
+  EXPECT_FALSE(drawn_observer.is_drawn());
+  drawn_observer.clear_change_count();
+
+  root.Add(&child_child);
+  EXPECT_EQ(1u, drawn_observer.change_count());
+  EXPECT_EQ(&child_child, drawn_observer.view());
+  EXPECT_EQ(nullptr, drawn_observer.ancestor());
+  EXPECT_TRUE(drawn_observer.is_drawn());
+}
+
+}  // namespace view_manager