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