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 "content/public/browser/web_contents_view.h"
   9 #include "grit/theme_resources.h"
  10 #include "ui/base/resource/resource_bundle.h"
  11 #include "ui/gfx/animation/linear_animation.h"
  12 #include "ui/gfx/rect.h"
  13 #include "ui/views/controls/image_view.h"
  14 #include "ui/views/widget/widget.h"
  15
  16 // How long to spend moving downwards and fading out after waiting.
  17 const int kMoveTimeMs = 600;
  18
  19 // The animation framerate.
  20 const int kFrameRateHz = 60;
  21
  22 namespace {
  23
  24 // DownloadStartAnimation creates an animation (which begins running
  25 // immediately) that animates an image downward from the center of the frame
  26 // provided on the constructor, while simultaneously fading it out.  To use,
  27 // simply call "new DownloadStartAnimation"; the class cleans itself up when it
  28 // finishes animating.
  29 class DownloadStartedAnimationViews : public gfx::LinearAnimation,
  30                                       public views::ImageView {
  31  public:
  32   explicit DownloadStartedAnimationViews(content::WebContents* web_contents);
  33
  34  private:
  35   // Move the animation to wherever it should currently be.
  36   void Reposition();
  37
  38   // Shut down the animation cleanly.
  39   void Close();
  40
  41   // Animation
  42   virtual void AnimateToState(double state) OVERRIDE;
  43
  44   // We use a TYPE_POPUP for the popup so that it may float above any windows in
  45   // our UI.
  46   views::Widget* popup_;
  47
  48   // The content area at the start of the animation. We store this so that the
  49   // download shelf's resizing of the content area doesn't cause the animation
  50   // to move around. This means that once started, the animation won't move
  51   // with the parent window, but it's so fast that this shouldn't cause too
  52   // much heartbreak.
  53   gfx::Rect web_contents_bounds_;
  54
  55   DISALLOW_COPY_AND_ASSIGN(DownloadStartedAnimationViews);
  56 };
  57
  58 DownloadStartedAnimationViews::DownloadStartedAnimationViews(
  59     content::WebContents* web_contents)
  60     : gfx::LinearAnimation(kMoveTimeMs, kFrameRateHz, NULL),
  61       popup_(NULL) {
  62   static gfx::ImageSkia* kDownloadImage = NULL;
  63   if (!kDownloadImage) {
  64     kDownloadImage = ui::ResourceBundle::GetSharedInstance().GetImageSkiaNamed(
  65         IDR_DOWNLOAD_ANIMATION_BEGIN);
  66   }
  67
  68   // If we're too small to show the download image, then don't bother -
  69   // the shelf will be enough.
  70   web_contents->GetView()->GetContainerBounds(&web_contents_bounds_);
  71   if (web_contents_bounds_.height() < kDownloadImage->height())
  72     return;
  73
  74   SetImage(kDownloadImage);
  75
  76   popup_ = new views::Widget;
  77
  78   views::Widget::InitParams params(views::Widget::InitParams::TYPE_POPUP);
  79   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
  80   params.accept_events = false;
  81   params.parent = web_contents->GetView()->GetNativeView();
  82   popup_->Init(params);
  83   popup_->SetOpacity(0x00);
  84   popup_->SetContentsView(this);
  85   Reposition();
  86   popup_->Show();
  87
  88   Start();
  89 }
  90
  91 void DownloadStartedAnimationViews::Reposition() {
  92   // Align the image with the bottom left of the web contents (so that it
  93   // points to the newly created download).
  94   gfx::Size size = GetPreferredSize();
  95   int x = base::i18n::IsRTL() ?
  96       web_contents_bounds_.right() - size.width() : web_contents_bounds_.x();
  97   popup_->SetBounds(gfx::Rect(
  98       x,
  99       static_cast<int>(web_contents_bounds_.bottom() -
 100           size.height() - size.height() * (1 - GetCurrentValue())),
 101       size.width(),
 102       size.height()));
 103 }
 104
 105 void DownloadStartedAnimationViews::Close() {
 106   popup_->Close();
 107 }
 108
 109 void DownloadStartedAnimationViews::AnimateToState(double state) {
 110   if (state >= 1.0) {
 111     Close();
 112   } else {
 113     Reposition();
 114
 115     // Start at zero, peak halfway and end at zero.
 116     double opacity = std::min(1.0 - pow(GetCurrentValue() - 0.5, 2) * 4.0,
 117                               static_cast<double>(1.0));
 118
 119     popup_->SetOpacity(static_cast<unsigned char>(opacity * 255.0));
 120   }
 121 }
 122
 123 }  // namespace
 124
 125 // static
 126 void DownloadStartedAnimation::Show(content::WebContents* web_contents) {
 127   // The animation will delete itself when it's finished.
 128   new DownloadStartedAnimationViews(web_contents);
 129 }