cc/animation/scrollbar_animation_controller_linear_fade.cc

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/animation/scrollbar_animation_controller_linear_fade.h"
   6
   7 #include "base/time/time.h"
   8 #include "cc/layers/layer_impl.h"
   9 #include "cc/layers/scrollbar_layer_impl_base.h"
  10
  11 namespace cc {
  12
  13 scoped_ptr<ScrollbarAnimationControllerLinearFade>
  14 ScrollbarAnimationControllerLinearFade::Create(
  15     LayerImpl* scroll_layer,
  16     ScrollbarAnimationControllerClient* client,
  17     base::TimeDelta delay_before_starting,
  18     base::TimeDelta resize_delay_before_starting,
  19     base::TimeDelta duration) {
  20   return make_scoped_ptr(
  21       new ScrollbarAnimationControllerLinearFade(scroll_layer,
  22                                                  client,
  23                                                  delay_before_starting,
  24                                                  resize_delay_before_starting,
  25                                                  duration));
  26 }
  27
  28 ScrollbarAnimationControllerLinearFade::ScrollbarAnimationControllerLinearFade(
  29     LayerImpl* scroll_layer,
  30     ScrollbarAnimationControllerClient* client,
  31     base::TimeDelta delay_before_starting,
  32     base::TimeDelta resize_delay_before_starting,
  33     base::TimeDelta duration)
  34     : ScrollbarAnimationController(client,
  35                                    delay_before_starting,
  36                                    resize_delay_before_starting,
  37                                    duration),
  38       scroll_layer_(scroll_layer) {
  39 }
  40
  41 ScrollbarAnimationControllerLinearFade::
  42     ~ScrollbarAnimationControllerLinearFade() {}
  43
  44 void ScrollbarAnimationControllerLinearFade::RunAnimationFrame(float progress) {
  45   ApplyOpacityToScrollbars(1.f - progress);
  46   if (progress == 1.f)
  47     StopAnimation();
  48 }
  49
  50 void ScrollbarAnimationControllerLinearFade::DidScrollUpdate(bool on_resize) {
  51   ScrollbarAnimationController::DidScrollUpdate(on_resize);
  52   ApplyOpacityToScrollbars(1.f);
  53 }
  54
  55 void ScrollbarAnimationControllerLinearFade::ApplyOpacityToScrollbars(
  56     float opacity) {
  57   if (!scroll_layer_->scrollbars())
  58     return;
  59
  60   LayerImpl::ScrollbarSet* scrollbars = scroll_layer_->scrollbars();
  61   for (LayerImpl::ScrollbarSet::iterator it = scrollbars->begin();
  62        it != scrollbars->end();
  63        ++it) {
  64     ScrollbarLayerImplBase* scrollbar = *it;
  65
  66     if (scrollbar->is_overlay_scrollbar())
  67       scrollbar->SetOpacity(scrollbar->CanScrollOrientation() ? opacity : 0);
  68   }
  69 }
  70
  71 }  // namespace cc