Reorder the NativeViews attached to a view via kViewHostKey according to the position of the view

ui/views/widget/native_widget_layer_reorderer_aura_unittest.cc

+// Copyright (c) 2012 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/aura/root_window.h"
+#include "ui/aura/test/aura_test_base.h"
+#include "ui/aura/test/test_windows.h"
+#include "ui/aura/window.h"
+#include "ui/compositor/layer.h"
+#include "ui/compositor/test/test_layers.h"
+#include "ui/views/view.h"
+#include "ui/views/view_constants_aura.h"
+#include "ui/views/widget/widget.h"
+
+namespace views {
+namespace {
+
+// Creates a control widget with the passed in parameters.
+// The caller takes ownership of the returned widget.
+Widget* CreateControlWidget(aura::Window* parent, const gfx::Rect& bounds) {
+  Widget::InitParams params(Widget::InitParams::TYPE_CONTROL);
+  params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
+  params.parent = parent;
+  params.bounds = bounds;
+  Widget* widget = new Widget();
+  widget->Init(params);
+  return widget;
+}
+
+// Sets the name of |window| and |window|'s layer to |name|.
+void SetWindowAndLayerName(aura::Window* window, const std::string& name) {
+  window->SetName(name);
+  window->layer()->set_name(name);
+}
+
+// Returns a string containing the name of each of the child windows (bottommost
+// first) of |parent|. The format of the string is "name1 name2 name3 ...".
+std::string ChildWindowNamesAsString(const aura::Window& parent) {
+  std::string names;
+  typedef std::vector<aura::Window*> Windows;
+  for (Windows::const_iterator it = parent.children().begin();
+       it != parent.children().end(); ++it) {
+    if (!names.empty())
+      names += " ";
+    names += (*it)->name();
+  }
+  return names;
+}
+
+typedef aura::test::AuraTestBase NativeWidgetLayerReordererTest;
+
+// Test that views with layers and views with attached windows are reordered
+// according to the view hierarchy.
+TEST_F(NativeWidgetLayerReordererTest, Basic) {
+  scoped_ptr<Widget> parent(CreateControlWidget(root_window(),
+                                                gfx::Rect(0, 0, 100, 100)));
+  parent->Show();
+  aura::Window* parent_window = parent->GetNativeWindow();
+
+  View* contents_view = new View();
+  parent->SetContentsView(contents_view);
+
+  // 1) Test that layers for views and layers for windows attached to a host
+  // view are stacked below the layers for any windows not attached to a host
+  // view.
+  View* v = new View();
+  v->SetPaintToLayer(true);
+  v->layer()->set_name("v");
+  contents_view->AddChildView(v);
+
+  scoped_ptr<Widget> w1(CreateControlWidget(parent_window,
+                                            gfx::Rect(0, 1, 100, 101)));
+  SetWindowAndLayerName(w1->GetNativeView(), "w1");
+  w1->Show();
+  scoped_ptr<Widget> w2(CreateControlWidget(parent_window,
+                                            gfx::Rect(0, 2, 100, 102)));
+  SetWindowAndLayerName(w2->GetNativeView(), "w2");
+  w2->Show();
+
+  EXPECT_EQ("w1 w2", ChildWindowNamesAsString(*parent_window));
+  EXPECT_EQ("v w1 w2",
+            ui::test::ChildLayerNamesAsString(*parent_window->layer()));
+
+  View* host_view2 = new View();
+  contents_view->AddChildView(host_view2);
+  w2->GetNativeView()->SetProperty(kHostViewKey, host_view2);
+  EXPECT_EQ("w2 w1", ChildWindowNamesAsString(*parent_window));
+  EXPECT_EQ("v w2 w1",
+            ui::test::ChildLayerNamesAsString(*parent_window->layer()));
+
+  View* host_view1 = new View();
+  w1->GetNativeView()->SetProperty(kHostViewKey, host_view1);
+  contents_view->AddChildViewAt(host_view1, 0);
+  EXPECT_EQ("w1 w2", ChildWindowNamesAsString(*parent_window));
+  EXPECT_EQ("w1 v w2",
+            ui::test::ChildLayerNamesAsString(*parent_window->layer()));
+
+  // 2) Test the z-order of the windows and layers as a result of reordering the
+  // views.
+  contents_view->RemoveChildView(host_view1);
+  contents_view->AddChildView(host_view1);
+  EXPECT_EQ("w2 w1", ChildWindowNamesAsString(*parent_window));
+  EXPECT_EQ("v w2 w1",
+            ui::test::ChildLayerNamesAsString(*parent_window->layer()));
+
+  contents_view->ReorderChildView(host_view2, -1);
+  EXPECT_EQ("w1 w2", ChildWindowNamesAsString(*parent_window));
+  EXPECT_EQ("v w1 w2",
+            ui::test::ChildLayerNamesAsString(*parent_window->layer()));
+
+  // 3) Test the z-order of the windows and layers as a result of reordering the
+  // views in situations where the window order remains unchanged.
+  contents_view->ReorderChildView(v, -1);
+  EXPECT_EQ("w1 w2", ChildWindowNamesAsString(*parent_window));
+  EXPECT_EQ("w1 w2 v",
+            ui::test::ChildLayerNamesAsString(*parent_window->layer()));
+
+  contents_view->ReorderChildView(host_view2, -1);
+  EXPECT_EQ("w1 w2", ChildWindowNamesAsString(*parent_window));
+  EXPECT_EQ("w1 v w2",
+            ui::test::ChildLayerNamesAsString(*parent_window->layer()));
+
+  // Work around for bug in NativeWidgetAura.
+  // TODO: fix bug and remove this.
+  parent->Close();
+}
+
+// It is possible to attach a window to a view which has a parent layer (other
+// than the widget layer). In this case, the parent layer of the host view and
+// the parent layer of the attached window are different. Test that the layers
+// and windows are properly reordered in this case.
+TEST_F(NativeWidgetLayerReordererTest, HostViewParentHasLayer) {
+  scoped_ptr<Widget> parent(CreateControlWidget(root_window(),
+                                                gfx::Rect(0, 0, 100, 100)));
+  parent->Show();
+  aura::Window* parent_window = parent->GetNativeWindow();
+
+  View* contents_view = new View();
+  parent->SetContentsView(contents_view);
+
+  // Create the following view hierarchy. (*) denotes views which paint to a
+  // layer.
+  //
+  // contents_view
+  // +-- v1
+  //     +-- v11*
+  //     +-- v12 (attached window)
+  //     +-- v13*
+  // +--v2*
+
+  View* v1 = new View();
+  contents_view->AddChildView(v1);
+
+  View* v11 = new View();
+  v11->SetPaintToLayer(true);
+  v11->layer()->set_name("v11");
+  v1->AddChildView(v11);
+
+  scoped_ptr<Widget> w(CreateControlWidget(parent_window,
+                                           gfx::Rect(0, 1, 100, 101)));
+  SetWindowAndLayerName(w->GetNativeView(), "w");
+  w->Show();
+
+  View* v12 = new View();
+  v1->AddChildView(v12);
+  w->GetNativeView()->SetProperty(kHostViewKey, v12);
+
+  View* v13 = new View();
+  v13->SetPaintToLayer(true);
+  v13->layer()->set_name("v13");
+  v1->AddChildView(v13);
+
+  View* v2 = new View();
+  v2->SetPaintToLayer(true);
+  v2->layer()->set_name("v2");
+  contents_view->AddChildView(v2);
+
+  // Test intial state.
+  EXPECT_EQ("w", ChildWindowNamesAsString(*parent_window));
+  EXPECT_EQ("v11 w v13 v2",
+            ui::test::ChildLayerNamesAsString(*parent_window->layer()));
+
+  // |w|'s layer should be stacked above |v1|'s layer.
+  v1->SetPaintToLayer(true);
+  v1->layer()->set_name("v1");
+  EXPECT_EQ("w", ChildWindowNamesAsString(*parent_window));
+  EXPECT_EQ("v1 w v2",
+            ui::test::ChildLayerNamesAsString(*parent_window->layer()));
+
+  // Test moving the host view from one view with a layer to another.
+  v2->AddChildView(v12);
+  EXPECT_EQ("w", ChildWindowNamesAsString(*parent_window));
+  EXPECT_EQ("v1 v2 w",
+            ui::test::ChildLayerNamesAsString(*parent_window->layer()));
+
+  // Work around for bug in NativeWidgetAura.
+  // TODO: fix bug and remove this.
+  parent->Close();
+}
+
+}  // namespace
+}  // namespace views