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(new ScrollbarAnimationControllerLinearFade(
  21       scroll_layer, client, delay_before_starting, resize_delay_before_starting,
  22       duration));
  23 }
  24
  25 ScrollbarAnimationControllerLinearFade::ScrollbarAnimationControllerLinearFade(
  26     LayerImpl* scroll_layer,
  27     ScrollbarAnimationControllerClient* client,
  28     base::TimeDelta delay_before_starting,
  29     base::TimeDelta resize_delay_before_starting,
  30     base::TimeDelta duration)
  31     : ScrollbarAnimationController(scroll_layer,
  32                                    client,
  33                                    delay_before_starting,
  34                                    resize_delay_before_starting,
  35                                    duration) {
  36 }
  37
  38 ScrollbarAnimationControllerLinearFade::
  39     ~ScrollbarAnimationControllerLinearFade() {
  40 }
  41
  42 void ScrollbarAnimationControllerLinearFade::RunAnimationFrame(float progress) {
  43   ApplyOpacityToScrollbars(1.f - progress);
  44   client_->SetNeedsRedrawForScrollbarAnimation();
  45   if (progress == 1.f)
  46     StopAnimation();
  47 }
  48
  49 void ScrollbarAnimationControllerLinearFade::DidScrollUpdate(bool on_resize) {
  50   ScrollbarAnimationController::DidScrollUpdate(on_resize);
  51   ApplyOpacityToScrollbars(1.f);
  52 }
  53
  54 void ScrollbarAnimationControllerLinearFade::ApplyOpacityToScrollbars(
  55     float opacity) {
  56   if (!scroll_layer_->scrollbars())
  57     return;
  58
  59   LayerImpl::ScrollbarSet* scrollbars = scroll_layer_->scrollbars();
  60   for (LayerImpl::ScrollbarSet::iterator it = scrollbars->begin();
  61        it != scrollbars->end(); ++it) {
  62     ScrollbarLayerImplBase* scrollbar = *it;
  63
  64     if (scrollbar->is_overlay_scrollbar())
  65       scrollbar->SetOpacity(scrollbar->CanScrollOrientation() ? opacity : 0);
  66   }
  67 }
  68
  69 }  // namespace cc