src/ui/app_list/views/progress_bar_view.cc

   1 // Copyright 2013 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 "ui/app_list/views/progress_bar_view.h"
   6
   7 #include <algorithm>
   8
   9 #include "grit/ui_resources.h"
  10 #include "ui/base/resource/resource_bundle.h"
  11 #include "ui/gfx/image/image_skia.h"
  12 #include "ui/gfx/insets.h"
  13 #include "ui/views/painter.h"
  14
  15 namespace app_list {
  16
  17 namespace {
  18
  19 // Image assets for the bar part.
  20 const int kProgressBarImages[] = {
  21   IDR_APP_LIST_ITEM_PROGRESS_LEFT,
  22   IDR_APP_LIST_ITEM_PROGRESS_CENTER,
  23   IDR_APP_LIST_ITEM_PROGRESS_RIGHT
  24 };
  25
  26 }  // namespace
  27
  28 ProgressBarView::ProgressBarView()
  29     : background_painter_(views::Painter::CreateImagePainter(
  30           *ResourceBundle::GetSharedInstance().GetImageSkiaNamed(
  31               IDR_APP_LIST_ITEM_PROGRESS_BACKGROUND),
  32           gfx::Insets(2, 2, 2, 2))),
  33       bar_painter_(new views::HorizontalPainter(kProgressBarImages)) {}
  34
  35 ProgressBarView::~ProgressBarView() {}
  36
  37 gfx::Size ProgressBarView::GetPreferredSize() {
  38   return background_painter_->GetMinimumSize();
  39 }
  40
  41 void ProgressBarView::OnPaint(gfx::Canvas* canvas) {
  42   gfx::Size paint_size = size();
  43
  44   const gfx::Size min_size(background_painter_->GetMinimumSize());
  45   if (paint_size.width() < min_size.width() ||
  46       paint_size.height() < min_size.height()) {
  47     return;
  48   }
  49
  50   background_painter_->Paint(canvas, paint_size);
  51
  52   const int kBarEndWidth = 4;
  53   const int bar_width = paint_size.width() - kBarEndWidth;
  54   DCHECK_GE(bar_width, 0);
  55
  56   // Map normalized value in [0,1] to the pixel width in
  57   // [kBarEndWidth, view_size.width()].
  58   paint_size.set_width(kBarEndWidth + bar_width * GetNormalizedValue());
  59   bar_painter_->Paint(canvas, paint_size);
  60 }
  61
  62 }  // namespace app_list