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 duration) {
  19   return make_scoped_ptr(new ScrollbarAnimationControllerLinearFade(
  20       scroll_layer, client, delay_before_starting, duration));
  21 }
  22
  23 ScrollbarAnimationControllerLinearFade::ScrollbarAnimationControllerLinearFade(
  24     LayerImpl* scroll_layer,
  25     ScrollbarAnimationControllerClient* client,
  26     base::TimeDelta delay_before_starting,
  27     base::TimeDelta duration)
  28     : ScrollbarAnimationController(client, delay_before_starting, duration),
  29       scroll_layer_(scroll_layer) {
  30 }
  31
  32 ScrollbarAnimationControllerLinearFade::
  33     ~ScrollbarAnimationControllerLinearFade() {}
  34
  35 void ScrollbarAnimationControllerLinearFade::RunAnimationFrame(float progress) {
  36   ApplyOpacityToScrollbars(1.f - progress);
  37   if (progress == 1.f)
  38     StopAnimation();
  39 }
  40
  41 void ScrollbarAnimationControllerLinearFade::DidScrollUpdate() {
  42   ScrollbarAnimationController::DidScrollUpdate();
  43   ApplyOpacityToScrollbars(1.f);
  44 }
  45
  46 void ScrollbarAnimationControllerLinearFade::ApplyOpacityToScrollbars(
  47     float opacity) {
  48   if (!scroll_layer_->scrollbars())
  49     return;
  50
  51   LayerImpl::ScrollbarSet* scrollbars = scroll_layer_->scrollbars();
  52   for (LayerImpl::ScrollbarSet::iterator it = scrollbars->begin();
  53        it != scrollbars->end();
  54        ++it) {
  55     ScrollbarLayerImplBase* scrollbar = *it;
  56     if (scrollbar->is_overlay_scrollbar())
  57       scrollbar->SetOpacity(opacity);
  58   }
  59 }
  60
  61 }  // namespace cc