chrome/browser/ui/views/download/download_started_animation_views.cc

   1 // Copyright (c) 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 "chrome/browser/download/download_started_animation.h"
   6
   7 #include "content/public/browser/web_contents.h"
   8 #include "grit/theme_resources.h"
   9 #include "ui/base/resource/resource_bundle.h"
  10 #include "ui/gfx/animation/linear_animation.h"
  11 #include "ui/gfx/rect.h"
  12 #include "ui/views/controls/image_view.h"
  13 #include "ui/views/widget/widget.h"
  14
  15 // How long to spend moving downwards and fading out after waiting.
  16 const int kMoveTimeMs = 600;
  17
  18 // The animation framerate.
  19 const int kFrameRateHz = 60;
  20
  21 namespace {
  22
  23 // DownloadStartAnimation creates an animation (which begins running
  24 // immediately) that animates an image downward from the center of the frame
  25 // provided on the constructor, while simultaneously fading it out.  To use,
  26 // simply call "new DownloadStartAnimation"; the class cleans itself up when it
  27 // finishes animating.
  28 class DownloadStartedAnimationViews : public gfx::LinearAnimation,
  29                                       public views::ImageView {
  30  public:
  31   explicit DownloadStartedAnimationViews(content::WebContents* web_contents);
  32
  33  private:
  34   // Move the animation to wherever it should currently be.
  35   void Reposition();
  36
  37   // Shut down the animation cleanly.
  38   void Close();
  39
  40   // Animation
  41   virtual void AnimateToState(double state) OVERRIDE;
  42
  43   // We use a TYPE_POPUP for the popup so that it may float above any windows in
  44   // our UI.
  45   views::Widget* popup_;
  46
  47   // The content area at the start of the animation. We store this so that the
  48   // download shelf's resizing of the content area doesn't cause the animation
  49   // to move around. This means that once started, the animation won't move
  50   // with the parent window, but it's so fast that this shouldn't cause too
  51   // much heartbreak.
  52   gfx::Rect web_contents_bounds_;
  53
  54   DISALLOW_COPY_AND_ASSIGN(DownloadStartedAnimationViews);
  55 };
  56
  57 DownloadStartedAnimationViews::DownloadStartedAnimationViews(
  58     content::WebContents* web_contents)
  59     : gfx::LinearAnimation(kMoveTimeMs, kFrameRateHz, NULL),
  60       popup_(NULL) {
  61   static gfx::ImageSkia* kDownloadImage = NULL;
  62   if (!kDownloadImage) {
  63     kDownloadImage = ui::ResourceBundle::GetSharedInstance().GetImageSkiaNamed(
  64         IDR_DOWNLOAD_ANIMATION_BEGIN);
  65   }
  66
  67   // If we're too small to show the download image, then don't bother -
  68   // the shelf will be enough.
  69   web_contents_bounds_= web_contents->GetContainerBounds();
  70   if (web_contents_bounds_.height() < kDownloadImage->height())
  71     return;
  72
  73   SetImage(kDownloadImage);
  74
  75   popup_ = new views::Widget;
  76
  77   views::Widget::InitParams params(views::Widget::InitParams::TYPE_POPUP);
  78   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
  79   params.accept_events = false;
  80   params.parent = web_contents->GetNativeView();
  81   popup_->Init(params);
  82   popup_->SetOpacity(0x00);
  83   popup_->SetContentsView(this);
  84   Reposition();
  85   popup_->Show();
  86
  87   Start();
  88 }
  89
  90 void DownloadStartedAnimationViews::Reposition() {
  91   // Align the image with the bottom left of the web contents (so that it
  92   // points to the newly created download).
  93   gfx::Size size = GetPreferredSize();
  94   int x = base::i18n::IsRTL() ?
  95       web_contents_bounds_.right() - size.width() : web_contents_bounds_.x();
  96   popup_->SetBounds(gfx::Rect(
  97       x,
  98       static_cast<int>(web_contents_bounds_.bottom() -
  99           size.height() - size.height() * (1 - GetCurrentValue())),
 100       size.width(),
 101       size.height()));
 102 }
 103
 104 void DownloadStartedAnimationViews::Close() {
 105   popup_->Close();
 106 }
 107
 108 void DownloadStartedAnimationViews::AnimateToState(double state) {
 109   if (state >= 1.0) {
 110     Close();
 111   } else {
 112     Reposition();
 113
 114     // Start at zero, peak halfway and end at zero.
 115     double opacity = std::min(1.0 - pow(GetCurrentValue() - 0.5, 2) * 4.0,
 116                               static_cast<double>(1.0));
 117
 118     popup_->SetOpacity(static_cast<unsigned char>(opacity * 255.0));
 119   }
 120 }
 121
 122 }  // namespace
 123
 124 // static
 125 void DownloadStartedAnimation::Show(content::WebContents* web_contents) {
 126   // The animation will delete itself when it's finished.
 127   new DownloadStartedAnimationViews(web_contents);
 128 }