Hide scrollbars when their dimensions are not scrollable.

cc/animation/scrollbar_animation_controller_linear_fade_unittest.cc

 // Copyright 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 "cc/animation/scrollbar_animation_controller_linear_fade.h"
 
 #include "cc/layers/solid_color_scrollbar_layer_impl.h"
 #include "cc/test/fake_impl_proxy.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
+#include "cc/test/geometry_test_utils.h"
 #include "cc/test/test_shared_bitmap_manager.h"
+#include "cc/trees/layer_tree_impl.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
 namespace {
 
 class ScrollbarAnimationControllerLinearFadeTest
     : public testing::Test,
       public ScrollbarAnimationControllerClient {
  public:
   ScrollbarAnimationControllerLinearFadeTest()
@@ skipping 13 matching lines @@
     const int kThumbThickness = 10;
     const int kTrackStart = 0;
     const bool kIsLeftSideVerticalScrollbar = false;
     const bool kIsOverlayScrollbar = true;  // Allow opacity animations.
 
     scoped_ptr<LayerImpl> scroll_layer =
         LayerImpl::Create(host_impl_.active_tree(), 1);
     scrollbar_layer_ =
         SolidColorScrollbarLayerImpl::Create(host_impl_.active_tree(),
                                              2,
-                                             HORIZONTAL,
+                                             orientation(),
                                              kThumbThickness,
                                              kTrackStart,
                                              kIsLeftSideVerticalScrollbar,
                                              kIsOverlayScrollbar);
     clip_layer_ = LayerImpl::Create(host_impl_.active_tree(), 3);
     scroll_layer->SetScrollClipLayer(clip_layer_->id());
     LayerImpl* scroll_layer_ptr = scroll_layer.get();
     clip_layer_->AddChild(scroll_layer.Pass());
 
     scrollbar_layer_->SetScrollLayerAndClipLayerByIds(scroll_layer_ptr->id(),
                                                       clip_layer_->id());
     clip_layer_->SetBounds(gfx::Size(100, 100));
-    scroll_layer_ptr->SetBounds(gfx::Size(50, 50));
+    scroll_layer_ptr->SetBounds(gfx::Size(200, 200));
 
     scrollbar_controller_ = ScrollbarAnimationControllerLinearFade::Create(
         scroll_layer_ptr,
         this,
         base::TimeDelta::FromSeconds(2),
         base::TimeDelta::FromSeconds(5),
         base::TimeDelta::FromSeconds(3));
   }
 
+  virtual ScrollbarOrientation orientation() const { return HORIZONTAL; }
+
   FakeImplProxy proxy_;
   TestSharedBitmapManager shared_bitmap_manager_;
   FakeLayerTreeHostImpl host_impl_;
   scoped_ptr<ScrollbarAnimationControllerLinearFade> scrollbar_controller_;
   scoped_ptr<LayerImpl> clip_layer_;
   scoped_ptr<SolidColorScrollbarLayerImpl> scrollbar_layer_;
 
   base::Closure start_fade_;
   base::TimeDelta delay_;
   int needs_frame_count_;
 };
 
+class VerticalScrollbarAnimationControllerLinearFadeTest
+    : public ScrollbarAnimationControllerLinearFadeTest {
+ protected:
+  virtual ScrollbarOrientation orientation() const override { return VERTICAL; }
+};
+
 TEST_F(ScrollbarAnimationControllerLinearFadeTest, DelayAnimationOnResize) {
   scrollbar_layer_->SetOpacity(0.0f);
   scrollbar_controller_->DidScrollBegin();
   scrollbar_controller_->DidScrollUpdate(true);
   scrollbar_controller_->DidScrollEnd();
   // Normal Animation delay of 2 seconds.
   EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->opacity());
   EXPECT_EQ(delay_, base::TimeDelta::FromSeconds(2));
 
   scrollbar_layer_->SetOpacity(0.0f);
@@ skipping 23 matching lines @@
 
   EXPECT_TRUE(start_fade_.Equals(base::Closure()));
 
   time += base::TimeDelta::FromSeconds(100);
   scrollbar_controller_->Animate(time);
   EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->opacity());
 
   EXPECT_EQ(0, needs_frame_count_);
 }
 
+TEST_F(ScrollbarAnimationControllerLinearFadeTest, HideOnResize) {
+  LayerImpl* scroll_layer = host_impl_.active_tree()->LayerById(1);
+  ASSERT_TRUE(scroll_layer);
+  EXPECT_SIZE_EQ(gfx::Size(200, 200), scroll_layer->bounds());
+
+  EXPECT_EQ(HORIZONTAL, scrollbar_layer_->orientation());
+
+  // Shrink along X axis, horizontal scrollbar should appear.
+  clip_layer_->SetBounds(gfx::Size(100, 200));
+  EXPECT_SIZE_EQ(gfx::Size(100, 200), clip_layer_->bounds());
+
+  scrollbar_controller_->DidScrollBegin();
+
+  scrollbar_controller_->DidScrollUpdate(false);
+  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->opacity());
+
+  scrollbar_controller_->DidScrollEnd();
+
+  // Shrink along Y axis and expand along X, horizontal scrollbar
+  // should disappear.
+  clip_layer_->SetBounds(gfx::Size(200, 100));
+  EXPECT_SIZE_EQ(gfx::Size(200, 100), clip_layer_->bounds());
+
+  scrollbar_controller_->DidScrollBegin();
+
+  scrollbar_controller_->DidScrollUpdate(false);
+  EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->opacity());
+
+  scrollbar_controller_->DidScrollEnd();
+}
+
+TEST_F(VerticalScrollbarAnimationControllerLinearFadeTest, HideOnResize) {
+  LayerImpl* scroll_layer = host_impl_.active_tree()->LayerById(1);
+  ASSERT_TRUE(scroll_layer);
+  EXPECT_SIZE_EQ(gfx::Size(200, 200), scroll_layer->bounds());
+
+  EXPECT_EQ(VERTICAL, scrollbar_layer_->orientation());
+
+  // Shrink along X axis, vertical scrollbar should remain invisible.
+  clip_layer_->SetBounds(gfx::Size(100, 200));
+  EXPECT_SIZE_EQ(gfx::Size(100, 200), clip_layer_->bounds());
+
+  scrollbar_controller_->DidScrollBegin();
+
+  scrollbar_controller_->DidScrollUpdate(false);
+  EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->opacity());
+
+  scrollbar_controller_->DidScrollEnd();
+
+  // Shrink along Y axis and expand along X, vertical scrollbar should appear.
+  clip_layer_->SetBounds(gfx::Size(200, 100));
+  EXPECT_SIZE_EQ(gfx::Size(200, 100), clip_layer_->bounds());
+
+  scrollbar_controller_->DidScrollBegin();
+
+  scrollbar_controller_->DidScrollUpdate(false);
+  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->opacity());
+
+  scrollbar_controller_->DidScrollEnd();
+}
+
+TEST_F(ScrollbarAnimationControllerLinearFadeTest,
+       HideOnUserNonScrollableHorz) {
+  EXPECT_EQ(HORIZONTAL, scrollbar_layer_->orientation());
+
+  LayerImpl* scroll_layer = host_impl_.active_tree()->LayerById(1);
+  ASSERT_TRUE(scroll_layer);
+  scroll_layer->set_user_scrollable_horizontal(false);
+
+  scrollbar_controller_->DidScrollBegin();
+
+  scrollbar_controller_->DidScrollUpdate(false);
+  EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->opacity());
+
+  scrollbar_controller_->DidScrollEnd();
+}
+
+TEST_F(ScrollbarAnimationControllerLinearFadeTest,
+       ShowOnUserNonScrollableVert) {
+  EXPECT_EQ(HORIZONTAL, scrollbar_layer_->orientation());
+
+  LayerImpl* scroll_layer = host_impl_.active_tree()->LayerById(1);
+  ASSERT_TRUE(scroll_layer);
+  scroll_layer->set_user_scrollable_vertical(false);
+
+  scrollbar_controller_->DidScrollBegin();
+
+  scrollbar_controller_->DidScrollUpdate(false);
+  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->opacity());
+
+  scrollbar_controller_->DidScrollEnd();
+}
+
+TEST_F(VerticalScrollbarAnimationControllerLinearFadeTest,
+       HideOnUserNonScrollableVert) {
+  EXPECT_EQ(VERTICAL, scrollbar_layer_->orientation());
+
+  LayerImpl* scroll_layer = host_impl_.active_tree()->LayerById(1);
+  ASSERT_TRUE(scroll_layer);
+  scroll_layer->set_user_scrollable_vertical(false);
+
+  scrollbar_controller_->DidScrollBegin();
+
+  scrollbar_controller_->DidScrollUpdate(false);
+  EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->opacity());
+
+  scrollbar_controller_->DidScrollEnd();
+}
+
+TEST_F(VerticalScrollbarAnimationControllerLinearFadeTest,
+       ShowOnUserNonScrollableHorz) {
+  EXPECT_EQ(VERTICAL, scrollbar_layer_->orientation());
+
+  LayerImpl* scroll_layer = host_impl_.active_tree()->LayerById(1);
+  ASSERT_TRUE(scroll_layer);
+  scroll_layer->set_user_scrollable_horizontal(false);
+
+  scrollbar_controller_->DidScrollBegin();
+
+  scrollbar_controller_->DidScrollUpdate(false);
+  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->opacity());
+
+  scrollbar_controller_->DidScrollEnd();
+}
+
 TEST_F(ScrollbarAnimationControllerLinearFadeTest, AwakenByScrollingGesture) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
   scrollbar_controller_->DidScrollBegin();
 
   scrollbar_controller_->DidScrollUpdate(false);
   EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->opacity());
 
   EXPECT_TRUE(start_fade_.Equals(base::Closure()));
 
@@ skipping 145 matching lines @@
   scrollbar_controller_->DidScrollUpdate(false);
   EXPECT_FLOAT_EQ(1, scrollbar_layer_->opacity());
 
   time += base::TimeDelta::FromSeconds(1);
   scrollbar_controller_->DidScrollEnd();
   EXPECT_FLOAT_EQ(1, scrollbar_layer_->opacity());
 }
 
 }  // namespace
 }  // namespace cc