icon_label_bubble_view.cc revision 0f1bc08d4cfcc34181b0b5cbf065c40f687bf740 
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/ui/views/location_bar/icon_label_bubble_view.h"
6
7#include "base/strings/utf_string_conversions.h"
8#include "chrome/browser/ui/views/location_bar/location_bar_view.h"
9#include "grit/theme_resources.h"
10#include "ui/base/resource/resource_bundle.h"
11#include "ui/gfx/canvas.h"
12#include "ui/gfx/color_utils.h"
13#include "ui/views/controls/image_view.h"
14#include "ui/views/controls/label.h"
15#include "ui/views/painter.h"
16
17
18IconLabelBubbleView::IconLabelBubbleView(const int background_images[],
19                                         const int hover_background_images[],
20                                         int contained_image,
21                                         const gfx::FontList& font_list,
22                                         SkColor text_color,
23                                         SkColor parent_background_color,
24                                         bool elide_in_middle)
25    : background_painter_(
26          views::Painter::CreateImageGridPainter(background_images)),
27      image_(new views::ImageView()),
28      label_(new views::Label(string16(), font_list)),
29      is_extension_icon_(false),
30      in_hover_(false) {
31  image_->SetImage(
32      ui::ResourceBundle::GetSharedInstance().GetImageSkiaNamed(
33          contained_image));
34
35  // Disable separate hit testing for |image_|.  This prevents views treating
36  // |image_| as a separate mouse hover region from |this|.
37  image_->set_interactive(false);
38  AddChildView(image_);
39
40  if (hover_background_images) {
41    hover_background_painter_.reset(
42        views::Painter::CreateImageGridPainter(hover_background_images));
43  }
44
45  label_->SetEnabledColor(text_color);
46  // Calculate the actual background color for the label.  The background images
47  // are painted atop |parent_background_color|.  We grab the color of the
48  // middle pixel of the middle image of the background, which we treat as the
49  // representative color of the entire background (reasonable, given the
50  // current appearance of these images).  Then we alpha-blend it over the
51  // parent background color to determine the actual color the label text will
52  // sit atop.
53  const SkBitmap& bitmap(
54      ui::ResourceBundle::GetSharedInstance().GetImageSkiaNamed(
55          background_images[4])->GetRepresentation(1.0f).sk_bitmap());
56  SkAutoLockPixels pixel_lock(bitmap);
57  SkColor background_image_color =
58      bitmap.getColor(bitmap.width() / 2, bitmap.height() / 2);
59  // Tricky bit: We alpha blend an opaque version of |background_image_color|
60  // against |parent_background_color| using the original image grid color's
61  // alpha. This is because AlphaBlend(a, b, 255) always returns |a| unchanged
62  // even if |a| is a color with non-255 alpha.
63  label_->SetBackgroundColor(
64      color_utils::AlphaBlend(SkColorSetA(background_image_color, 255),
65                              parent_background_color,
66                              SkColorGetA(background_image_color)));
67  if (elide_in_middle)
68    label_->SetElideBehavior(views::Label::ELIDE_IN_MIDDLE);
69  AddChildView(label_);
70}
71
72IconLabelBubbleView::~IconLabelBubbleView() {
73}
74
75void IconLabelBubbleView::SetLabel(const string16& label) {
76  label_->SetText(label);
77}
78
79void IconLabelBubbleView::SetImage(const gfx::ImageSkia& image_skia) {
80  image_->SetImage(image_skia);
81}
82
83gfx::Size IconLabelBubbleView::GetPreferredSize() {
84  // Height will be ignored by the LocationBarView.
85  return GetSizeForLabelWidth(label_->GetPreferredSize().width());
86}
87
88void IconLabelBubbleView::Layout() {
89  image_->SetBounds(GetBubbleOuterPadding(!is_extension_icon_), 0,
90                    image_->GetPreferredSize().width(), height());
91  const int pre_label_width = GetPreLabelWidth();
92  label_->SetBounds(pre_label_width, 0,
93                    width() - pre_label_width - GetBubbleOuterPadding(false),
94                    height());
95}
96
97gfx::Size IconLabelBubbleView::GetSizeForLabelWidth(int width) const {
98  gfx::Size size(GetPreLabelWidth() + width + GetBubbleOuterPadding(false), 0);
99  size.SetToMax(background_painter_->GetMinimumSize());
100  return size;
101}
102
103void IconLabelBubbleView::OnMouseEntered(const ui::MouseEvent& event) {
104  in_hover_ = true;
105  if (hover_background_painter_.get())
106    SchedulePaint();
107}
108
109void IconLabelBubbleView::OnMouseExited(const ui::MouseEvent& event) {
110  in_hover_ = false;
111  if (hover_background_painter_.get())
112    SchedulePaint();
113}
114
115// static
116int IconLabelBubbleView::GetBubbleOuterPadding(bool by_icon) {
117  return LocationBarView::GetItemPadding() - LocationBarView::kBubblePadding +
118      (by_icon ? 0 : LocationBarView::kIconInternalPadding);
119}
120
121void IconLabelBubbleView::OnPaint(gfx::Canvas* canvas) {
122  views::Painter* painter = (in_hover_ && hover_background_painter_) ?
123      hover_background_painter_.get() : background_painter_.get();
124  painter->Paint(canvas, size());
125}
126
127int IconLabelBubbleView::GetPreLabelWidth() const {
128  const int image_width = image_->GetPreferredSize().width();
129  return GetBubbleOuterPadding(true) +
130      (image_width ? (image_width + LocationBarView::GetItemPadding()) : 0);
131}
132