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/geometry/rect.h"
  14 #include "ui/gfx/image/image_skia.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   int resource_id = 0;
  75   switch (bezel_type) {
  76     case BEZEL_NONE:
  77       break;
  78     case BEZEL_HOVER:
  79       resource_id = IDR_TOOLBAR_BEZEL_HOVER;
  80       break;
  81     case BEZEL_PRESSED:
  82       resource_id = IDR_TOOLBAR_BEZEL_PRESSED;
  83       break;
  84   }
  85
  86   if (resource_id) {
  87     gfx::ImageSkia* image = theme_provider->GetImageSkiaNamed(resource_id);
  88     canvas->DrawImageInt(*image,
  89                          center.x() - image->width() / 2,
  90                          center.y() - image->height() / 2);
  91   }
  92
  93   // The bars with no color.
  94   {
  95     gfx::ImageSkia* image = theme_provider->GetImageSkiaNamed(IDR_TOOLS_BAR);
  96     int x = center.x() - image->width() / 2;
  97     int y = center.y() - image->height() * kBarCount / 2;
  98     for (int i = 0; i < kBarCount; ++i) {
  99       canvas->DrawImageInt(*image, x, y);
 100       y += image->height();
 101     }
 102   }
 103
 104   // The bars with color based on severity.
 105   int severity_image_id = GetCurrentSeverityImageID();
 106   if (severity_image_id) {
 107     gfx::ImageSkia* image =
 108         theme_provider->GetImageSkiaNamed(severity_image_id);
 109     int x = center.x() - image->width() / 2;
 110     int y = center.y() - image->height() * kBarCount / 2;
 111     for (int i = 0; i < kBarCount; ++i) {
 112       SkPaint paint;
 113       int width = image->width();
 114
 115       if (animation_ && animation_->is_animating()) {
 116         if (animation_->current_part_index() % 2 == 1) {
 117           // Fade out.
 118           int alpha = animation_->CurrentValueBetween(0xFF, 0);
 119           if (alpha == 0)
 120             continue;
 121           paint.setAlpha(alpha);
 122         } else {
 123           // Stagger the widths.
 124           width = image->width() *
 125                   GetStaggeredValue(animation_->GetCurrentValue(), i);
 126           if (width == 0)
 127             continue;
 128         }
 129       }
 130
 131       canvas->DrawImageInt(*image, 0, 0, width, image->height(),
 132                             x, y, width, image->height(), false, paint);
 133       y += image->height();
 134     }
 135   }
 136
 137   if (!badge_.isNull())
 138     canvas->DrawImageInt(badge_, 0, 0);
 139 }
 140
 141 void WrenchIconPainter::AnimationProgressed(const gfx::Animation* animation) {
 142   delegate_->ScheduleWrenchIconPaint();
 143 }
 144
 145 int WrenchIconPainter::GetCurrentSeverityImageID() const {
 146   switch (severity_) {
 147     case SEVERITY_NONE:
 148       return 0;
 149     case SEVERITY_LOW:
 150       return IDR_TOOLS_BAR_LOW;
 151     case SEVERITY_MEDIUM:
 152       return IDR_TOOLS_BAR_MEDIUM;
 153     case SEVERITY_HIGH:
 154       return IDR_TOOLS_BAR_HIGH;
 155   }
 156   NOTREACHED();
 157   return 0;
 158 }