exo: Add support for subcompositor interface.

components/exo/sub_surface_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 "components/exo/sub_surface.h"
+#include "components/exo/surface.h"
+#include "components/exo/test/exo_test_base.h"
+#include "components/exo/test/exo_test_helper.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace exo {
+namespace {
+
+using SubSurfaceTest = test::ExoTestBase;
+
+TEST_F(SubSurfaceTest, SetPosition) {
+  scoped_ptr<Surface> parent(new Surface);
+  scoped_ptr<Surface> surface(new Surface);
+  scoped_ptr<SubSurface> sub_surface(
+      new SubSurface(surface.get(), parent.get()));
+
+  // Initial position is at the origin.
+  EXPECT_EQ(gfx::Point().ToString(), surface->bounds().origin().ToString());
+
+  // Set position to 10, 10.
+  gfx::Point position(10, 10);
+  sub_surface->SetPosition(position);
+
+  // A call to Commit() is required for position to take effect.
+  EXPECT_EQ(gfx::Point().ToString(), surface->bounds().origin().ToString());
+
+  // Check that position is updated when Commit() is called.
+  parent->Commit();
+  EXPECT_EQ(position.ToString(), surface->bounds().origin().ToString());
+}
+
+TEST_F(SubSurfaceTest, PlaceAbove) {
+  scoped_ptr<Surface> parent(new Surface);
+  scoped_ptr<Surface> surface1(new Surface);
+  scoped_ptr<Surface> surface2(new Surface);
+  scoped_ptr<Surface> non_sibling_surface(new Surface);
+  scoped_ptr<SubSurface> sub_surface1(
+      new SubSurface(surface1.get(), parent.get()));
+  scoped_ptr<SubSurface> sub_surface2(
+      new SubSurface(surface2.get(), parent.get()));
+
+  ASSERT_EQ(2, parent->child_count());
+  EXPECT_EQ(surface1.get(), parent->child_at(0));
+  EXPECT_EQ(surface2.get(), parent->child_at(1));
+
+  sub_surface2->PlaceAbove(parent.get());
+  sub_surface1->PlaceAbove(non_sibling_surface.get());  // Invalid
+  sub_surface1->PlaceAbove(surface1.get());             // Invalid
+  sub_surface1->PlaceAbove(surface2.get());
+
+  // Nothing should have changed as Commit() is required for new stacking
+  // order to take effect.
+  EXPECT_EQ(surface1.get(), parent->child_at(0));
+  EXPECT_EQ(surface2.get(), parent->child_at(1));
+
+  parent->Commit();
+
+  // surface1 should now be stacked above surface2.
+  EXPECT_EQ(surface2.get(), parent->child_at(0));
+  EXPECT_EQ(surface1.get(), parent->child_at(1));
+}
+
+TEST_F(SubSurfaceTest, PlaceBelow) {
+  scoped_ptr<Surface> parent(new Surface);
+  scoped_ptr<Surface> surface1(new Surface);
+  scoped_ptr<Surface> surface2(new Surface);
+  scoped_ptr<Surface> non_sibling_surface(new Surface);
+  scoped_ptr<SubSurface> sub_surface1(
+      new SubSurface(surface1.get(), parent.get()));
+  scoped_ptr<SubSurface> sub_surface2(
+      new SubSurface(surface2.get(), parent.get()));
+
+  ASSERT_EQ(2, parent->child_count());
+  EXPECT_EQ(surface1.get(), parent->child_at(0));
+  EXPECT_EQ(surface2.get(), parent->child_at(1));
+
+  sub_surface2->PlaceBelow(parent.get());               // Invalid
+  sub_surface2->PlaceBelow(non_sibling_surface.get());  // Invalid
+  sub_surface1->PlaceBelow(surface2.get());
+  sub_surface2->PlaceBelow(surface1.get());
+
+  // Nothing should have changed as Commit() is required for new stacking
+  // order to take effect.
+  EXPECT_EQ(surface1.get(), parent->child_at(0));
+  EXPECT_EQ(surface2.get(), parent->child_at(1));
+
+  parent->Commit();
+
+  // surface1 should now be stacked above surface2.
+  EXPECT_EQ(surface2.get(), parent->child_at(0));
+  EXPECT_EQ(surface1.get(), parent->child_at(1));
+}
+
+TEST_F(SubSurfaceTest, SetCommitBehavior) {
+  scoped_ptr<Surface> parent(new Surface);
+  scoped_ptr<Surface> child(new Surface);
+  scoped_ptr<Surface> grandchild(new Surface);
+  scoped_ptr<SubSurface> child_sub_surface(
+      new SubSurface(child.get(), parent.get()));
+  scoped_ptr<SubSurface> grandchild_sub_surface(
+      new SubSurface(grandchild.get(), child.get()));
+
+  // Initial position is at the origin.
+  EXPECT_EQ(gfx::Point().ToString(), grandchild->bounds().origin().ToString());
+
+  // Set position to 10, 10.
+  gfx::Point position1(10, 10);
+  grandchild_sub_surface->SetPosition(position1);
+  child->Commit();
+
+  // Initial commit behavior is synchronous and the effect of the child
+  // Commit() call will not take effect until Commit() is called on the
+  // parent.
+  EXPECT_EQ(gfx::Point().ToString(), grandchild->bounds().origin().ToString());
+
+  parent->Commit();
+
+  // Position should have been updated when Commit() has been called on both
+  // child and parent.
+  EXPECT_EQ(position1.ToString(), grandchild->bounds().origin().ToString());
+
+  // Disable synchronous commit behavior.
+  bool synchronized = false;
+  child_sub_surface->SetCommitBehavior(synchronized);
+
+  // Set position to 20, 20.
+  gfx::Point position2(20, 20);
+  grandchild_sub_surface->SetPosition(position2);
+  child->Commit();
+
+  // A Commit() call on child should be sufficient for the position of
+  // grandchild to take effect when synchronous is disabled.
+  EXPECT_EQ(position2.ToString(), grandchild->bounds().origin().ToString());
+}
+
+}  // namespace
+}  // namespace exo