Implement progress bar spec (determinate and indeterminate).

ui/app_list/views/progress_bar_view.cc

-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "ui/app_list/views/progress_bar_view.h"
-
-#include <algorithm>
-
-#include "ui/app_list/resources/grit/app_list_resources.h"
-#include "ui/base/resource/resource_bundle.h"
-#include "ui/gfx/geometry/insets.h"
-#include "ui/gfx/image/image_skia.h"
-#include "ui/views/painter.h"
-
-namespace app_list {
-
-namespace {
-
-// Image assets for the bar part.
-const int kProgressBarImages[] = {
-  IDR_APP_LIST_ITEM_PROGRESS_LEFT,
-  IDR_APP_LIST_ITEM_PROGRESS_CENTER,
-  IDR_APP_LIST_ITEM_PROGRESS_RIGHT
-};
-
-}  // namespace
-
-ProgressBarView::ProgressBarView()
-    : background_painter_(views::Painter::CreateImagePainter(
-          *ResourceBundle::GetSharedInstance().GetImageSkiaNamed(
-              IDR_APP_LIST_ITEM_PROGRESS_BACKGROUND),
-          gfx::Insets(2, 2, 2, 2))),
-      bar_painter_(new views::HorizontalPainter(kProgressBarImages)) {}
-
-ProgressBarView::~ProgressBarView() {}
-
-gfx::Size ProgressBarView::GetPreferredSize() const {
-  return background_painter_->GetMinimumSize();
-}
-
-void ProgressBarView::OnPaint(gfx::Canvas* canvas) {
-  gfx::Size paint_size = size();
-
-  const gfx::Size min_size(background_painter_->GetMinimumSize());
-  if (paint_size.width() < min_size.width() ||
-      paint_size.height() < min_size.height()) {
-    return;
-  }
-
-  background_painter_->Paint(canvas, paint_size);
-
-  const int kBarEndWidth = 4;
-  const int bar_width = paint_size.width() - kBarEndWidth;
-  DCHECK_GE(bar_width, 0);
-
-  // Map normalized value in [0,1] to the pixel width in
-  // [kBarEndWidth, view_size.width()].
-  paint_size.set_width(kBarEndWidth + bar_width * GetNormalizedValue());
-  bar_painter_->Paint(canvas, paint_size);
-}
-
-}  // namespace app_list