Pulls display related changes from mojo to chrome

mojo/services/view_manager/focus_controller_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/focus_controller.h"
+
+#include "mojo/services/view_manager/focus_controller_delegate.h"
+#include "mojo/services/view_manager/server_view.h"
+#include "mojo/services/view_manager/test_server_view_delegate.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace view_manager {
+namespace {
+
+class TestFocusControllerDelegate : public FocusControllerDelegate {
+ public:
+  TestFocusControllerDelegate()
+      : change_count_(0u),
+        old_focused_view_(nullptr),
+        new_focused_view_(nullptr) {}
+
+  void ClearAll() {
+    change_count_ = 0u;
+    old_focused_view_ = nullptr;
+    new_focused_view_ = nullptr;
+  }
+  size_t change_count() const { return change_count_; }
+  ServerView* old_focused_view() { return old_focused_view_; }
+  ServerView* new_focused_view() { return new_focused_view_; }
+
+ private:
+  // FocusControllerDelegate:
+  void OnFocusChanged(ServerView* old_focused_view,
+                      ServerView* new_focused_view) override {
+    change_count_++;
+    old_focused_view_ = old_focused_view;
+    new_focused_view_ = new_focused_view;
+  }
+
+  size_t change_count_;
+  ServerView* old_focused_view_;
+  ServerView* new_focused_view_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestFocusControllerDelegate);
+};
+
+}  // namespace
+
+TEST(FocusControllerTest, Basic) {
+  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);
+
+  TestFocusControllerDelegate focus_delegate;
+  FocusController focus_controller(&focus_delegate, &root);
+
+  focus_controller.SetFocusedView(&child_child);
+  EXPECT_EQ(0u, focus_delegate.change_count());
+
+  // Remove the ancestor of the focused view, focus should go to the |root|.
+  root.Remove(&child);
+  EXPECT_EQ(1u, focus_delegate.change_count());
+  EXPECT_EQ(&root, focus_delegate.new_focused_view());
+  EXPECT_EQ(&child_child, focus_delegate.old_focused_view());
+  focus_delegate.ClearAll();
+
+  // Make the focused view invisible. Focus is lost in this case (as no one
+  // to give focus to).
+  root.SetVisible(false);
+  EXPECT_EQ(1u, focus_delegate.change_count());
+  EXPECT_EQ(nullptr, focus_delegate.new_focused_view());
+  EXPECT_EQ(&root, focus_delegate.old_focused_view());
+  focus_delegate.ClearAll();
+
+  // Go back to initial state and focus |child_child|.
+  root.SetVisible(true);
+  root.Add(&child);
+  focus_controller.SetFocusedView(&child_child);
+  EXPECT_EQ(0u, focus_delegate.change_count());
+
+  // Hide the focused view, focus should go to parent.
+  child_child.SetVisible(false);
+  EXPECT_EQ(1u, focus_delegate.change_count());
+  EXPECT_EQ(&child, focus_delegate.new_focused_view());
+  EXPECT_EQ(&child_child, focus_delegate.old_focused_view());
+  focus_delegate.ClearAll();
+
+  child_child.SetVisible(true);
+  focus_controller.SetFocusedView(&child_child);
+  EXPECT_EQ(0u, focus_delegate.change_count());
+
+  // Hide the parent of the focused view.
+  child.SetVisible(false);
+  EXPECT_EQ(1u, focus_delegate.change_count());
+  EXPECT_EQ(&root, focus_delegate.new_focused_view());
+  EXPECT_EQ(&child_child, focus_delegate.old_focused_view());
+  focus_delegate.ClearAll();
+}
+
+}  // namespace view_manager