chrome/browser/ui/gtk/download/download_started_animation_gtk.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 <math.h>
   8
   9 #include <gtk/gtk.h>
  10
  11 #include "base/message_loop/message_loop.h"
  12 #include "content/public/browser/web_contents.h"
  13 #include "content/public/browser/web_contents_view.h"
  14 #include "grit/theme_resources.h"
  15 #include "ui/base/resource/resource_bundle.h"
  16 #include "ui/gfx/animation/linear_animation.h"
  17 #include "ui/gfx/image/image.h"
  18 #include "ui/gfx/rect.h"
  19
  20 namespace {
  21
  22 // How long to spend moving downwards and fading out after waiting.
  23 const int kMoveTimeMs = 600;
  24
  25 // The animation framerate.
  26 const int kFrameRateHz = 60;
  27
  28 class DownloadStartedAnimationGtk : public gfx::LinearAnimation {
  29  public:
  30   explicit DownloadStartedAnimationGtk(content::WebContents* web_contents);
  31
  32   // DownloadStartedAnimation will delete itself, but this is public so
  33   // that we can use DeleteSoon().
  34   virtual ~DownloadStartedAnimationGtk();
  35
  36  private:
  37   // Move the arrow to wherever it should currently be.
  38   void Reposition();
  39
  40   // Shut down cleanly.
  41   void Close();
  42
  43   // Animation implementation.
  44   virtual void AnimateToState(double state) OVERRIDE;
  45
  46   // The top level window that floats over the browser and displays the
  47   // image.
  48   GtkWidget* popup_;
  49
  50   // Dimensions of the image.
  51   int width_;
  52   int height_;
  53
  54   // The content area at the start of the animation. We store this so that the
  55   // download shelf's resizing of the content area doesn't cause the animation
  56   // to move around. This means that once started, the animation won't move
  57   // with the parent window, but it's so fast that this shouldn't cause too
  58   // much heartbreak.
  59   gfx::Rect web_contents_bounds_;
  60
  61   DISALLOW_COPY_AND_ASSIGN(DownloadStartedAnimationGtk);
  62 };
  63
  64 DownloadStartedAnimationGtk::DownloadStartedAnimationGtk(
  65     content::WebContents* web_contents)
  66     : gfx::LinearAnimation(kMoveTimeMs, kFrameRateHz, NULL),
  67       popup_(NULL) {
  68   static GdkPixbuf* kDownloadImage = NULL;
  69   if (!kDownloadImage) {
  70     ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
  71     kDownloadImage = rb.GetNativeImageNamed(
  72         IDR_DOWNLOAD_ANIMATION_BEGIN).ToGdkPixbuf();
  73   }
  74
  75   width_ = gdk_pixbuf_get_width(kDownloadImage);
  76   height_ = gdk_pixbuf_get_height(kDownloadImage);
  77
  78   // If we're too small to show the download image, then don't bother -
  79   // the shelf will be enough.
  80   web_contents->GetView()->GetContainerBounds(&web_contents_bounds_);
  81   if (web_contents_bounds_.height() < height_)
  82     return;
  83
  84   // TODO(estade): don't show up on the wrong virtual desktop.
  85
  86   popup_ = gtk_window_new(GTK_WINDOW_POPUP);
  87   GtkWidget* image = gtk_image_new_from_pixbuf(kDownloadImage);
  88   gtk_container_add(GTK_CONTAINER(popup_), image);
  89
  90   // Set the shape of the window to that of the arrow. Areas with
  91   // opacity less than 0xff (i.e. <100% opacity) will be transparent.
  92   GdkBitmap* mask = gdk_pixmap_new(NULL, width_, height_, 1);
  93   gdk_pixbuf_render_threshold_alpha(kDownloadImage, mask,
  94                                     0, 0,
  95                                     0, 0, -1, -1,
  96                                     0xff);
  97   gtk_widget_shape_combine_mask(popup_, mask, 0, 0);
  98   g_object_unref(mask);
  99
 100   Reposition();
 101   gtk_widget_show_all(popup_);
 102   // Make sure our window has focus, is brought to the top, etc.
 103   gtk_window_present(GTK_WINDOW(popup_));
 104
 105   Start();
 106 }
 107
 108 DownloadStartedAnimationGtk::~DownloadStartedAnimationGtk() {
 109 }
 110
 111 void DownloadStartedAnimationGtk::Reposition() {
 112   DCHECK(popup_);
 113
 114   // Align the image with the bottom left of the web contents (so that it
 115   // points to the newly created download).
 116   gtk_window_move(GTK_WINDOW(popup_),
 117       web_contents_bounds_.x(),
 118       static_cast<int>(web_contents_bounds_.bottom() -
 119           height_ - height_ * (1 - GetCurrentValue())));
 120 }
 121
 122 void DownloadStartedAnimationGtk::Close() {
 123   DCHECK(popup_);
 124
 125   gtk_widget_destroy(popup_);
 126   base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
 127 }
 128
 129 void DownloadStartedAnimationGtk::AnimateToState(double state) {
 130   if (state >= 1.0) {
 131     Close();
 132   } else {
 133     Reposition();
 134
 135     // Start at zero, peak halfway and end at zero.
 136     double opacity = std::min(1.0 - pow(GetCurrentValue() - 0.5, 2) * 4.0,
 137                               static_cast<double>(1.0));
 138
 139     // This only works when there's a compositing manager running. Oh well.
 140     gtk_window_set_opacity(GTK_WINDOW(popup_), opacity);
 141   }
 142 }
 143
 144 }  // namespace
 145
 146 // static
 147 void DownloadStartedAnimation::Show(content::WebContents* web_contents) {
 148   // The animation will delete itself.
 149   new DownloadStartedAnimationGtk(web_contents);
 150 }