src/chrome/browser/ui/toolbar/wrench_icon_painter.cc

   1 // Copyright (c) 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 "chrome/browser/ui/toolbar/wrench_icon_painter.h"
   6
   7 #include <algorithm>
   8
   9 #include "grit/theme_resources.h"
  10 #include "ui/base/theme_provider.h"
  11 #include "ui/gfx/animation/multi_animation.h"
  12 #include "ui/gfx/canvas.h"
  13 #include "ui/gfx/image/image_skia.h"
  14 #include "ui/gfx/rect.h"
  15
  16 namespace {
  17
  18 // The wrench icon is made up of this many bars stacked vertically.
  19 const int kBarCount = 3;
  20
  21 // |value| is the animation progress from 0 to 1. |index| is the index of the
  22 // bar being drawn. This function returns a new progress value (from 0 to 1)
  23 // such that bars appear staggered.
  24 double GetStaggeredValue(double value, int index) {
  25   // When animating the wrench icon's bars the bars are staggered by this
  26   // factor.
  27   const double kStaggerFactor = 0.15;
  28   double maxStaggeredValue = 1.0 - (kBarCount - 1) * kStaggerFactor;
  29   double staggeredValue = (value - kStaggerFactor * index) / maxStaggeredValue;
  30   return std::min(1.0, std::max(0.0, staggeredValue));
  31 }
  32
  33 }  // namespace
  34
  35 WrenchIconPainter::WrenchIconPainter(Delegate* delegate)
  36     : delegate_(delegate),
  37       severity_(SEVERITY_NONE) {
  38 }
  39
  40 WrenchIconPainter::~WrenchIconPainter() {}
  41
  42 void WrenchIconPainter::SetSeverity(Severity severity, bool animate) {
  43   if (severity_ == severity)
  44     return;
  45
  46   severity_ = severity;
  47   delegate_->ScheduleWrenchIconPaint();
  48   animation_.reset();
  49   if (severity_ == SEVERITY_NONE || !animate)
  50     return;
  51
  52   gfx::MultiAnimation::Parts parts;
  53   // Animate the bars left to right.
  54   parts.push_back(gfx::MultiAnimation::Part(1300, gfx::Tween::LINEAR));
  55   // Fade out animation.
  56   parts.push_back(gfx::MultiAnimation::Part(1000, gfx::Tween::EASE_IN));
  57   // Again, animate the bars left to right.
  58   parts.push_back(gfx::MultiAnimation::Part(1300, gfx::Tween::LINEAR));
  59
  60   animation_.reset(
  61       new gfx::MultiAnimation(parts, base::TimeDelta::FromMilliseconds(40)));
  62   animation_->set_delegate(this);
  63   animation_->set_continuous(false);
  64   animation_->Start();
  65 }
  66
  67 void WrenchIconPainter::Paint(gfx::Canvas* canvas,
  68                               ui::ThemeProvider* theme_provider,
  69                               const gfx::Rect& rect,
  70                               BezelType bezel_type) {
  71   gfx::Point center = rect.CenterPoint();
  72
  73   // Bezel.
  74   if (bezel_type != BEZEL_NONE) {
  75     gfx::ImageSkia* image = theme_provider->GetImageSkiaNamed(
  76         bezel_type == BEZEL_HOVER ? IDR_TOOLBAR_BEZEL_HOVER
  77                                   : IDR_TOOLBAR_BEZEL_PRESSED);
  78     canvas->DrawImageInt(*image,
  79                          center.x() - image->width() / 2,
  80                          center.y() - image->height() / 2);
  81   }
  82
  83   // The bars with no color.
  84   {
  85     gfx::ImageSkia* image = theme_provider->GetImageSkiaNamed(IDR_TOOLS_BAR);
  86     int x = center.x() - image->width() / 2;
  87     int y = center.y() - image->height() * kBarCount / 2;
  88     for (int i = 0; i < kBarCount; ++i) {
  89       canvas->DrawImageInt(*image, x, y);
  90       y += image->height();
  91     }
  92   }
  93
  94   // The bars with color based on severity.
  95   int severity_image_id = GetCurrentSeverityImageID();
  96   if (severity_image_id) {
  97     gfx::ImageSkia* image =
  98         theme_provider->GetImageSkiaNamed(severity_image_id);
  99     int x = center.x() - image->width() / 2;
 100     int y = center.y() - image->height() * kBarCount / 2;
 101     for (int i = 0; i < kBarCount; ++i) {
 102       SkPaint paint;
 103       int width = image->width();
 104
 105       if (animation_ && animation_->is_animating()) {
 106         if (animation_->current_part_index() % 2 == 1) {
 107           // Fade out.
 108           int alpha = animation_->CurrentValueBetween(0xFF, 0);
 109           if (alpha == 0)
 110             continue;
 111           paint.setAlpha(alpha);
 112         } else {
 113           // Stagger the widths.
 114           width = image->width() *
 115                   GetStaggeredValue(animation_->GetCurrentValue(), i);
 116           if (width == 0)
 117             continue;
 118         }
 119       }
 120
 121       canvas->DrawImageInt(*image, 0, 0, width, image->height(),
 122                             x, y, width, image->height(), false, paint);
 123       y += image->height();
 124     }
 125   }
 126
 127   if (!badge_.isNull())
 128     canvas->DrawImageInt(badge_, 0, 0);
 129 }
 130
 131 void WrenchIconPainter::AnimationProgressed(const gfx::Animation* animation) {
 132   delegate_->ScheduleWrenchIconPaint();
 133 }
 134
 135 int WrenchIconPainter::GetCurrentSeverityImageID() const {
 136   switch (severity_) {
 137     case SEVERITY_NONE:
 138       return 0;
 139     case SEVERITY_LOW:
 140       return IDR_TOOLS_BAR_LOW;
 141     case SEVERITY_MEDIUM:
 142       return IDR_TOOLS_BAR_MEDIUM;
 143     case SEVERITY_HIGH:
 144       return IDR_TOOLS_BAR_HIGH;
 145   }
 146   NOTREACHED();
 147   return 0;
 148 }