ui/views/controls/throbber.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 "ui/views/controls/throbber.h"
   6
   7 #include "ui/base/resource/resource_bundle.h"
   8 #include "ui/gfx/animation/tween.h"
   9 #include "ui/gfx/canvas.h"
  10 #include "ui/gfx/image/image.h"
  11 #include "ui/gfx/image/image_skia.h"
  12 #include "ui/gfx/paint_throbber.h"
  13 #include "ui/native_theme/common_theme.h"
  14 #include "ui/native_theme/native_theme.h"
  15 #include "ui/resources/grit/ui_resources.h"
  16
  17 namespace views {
  18
  19 Throbber::Throbber() : checked_(false), checkmark_(nullptr) {
  20 }
  21
  22 Throbber::~Throbber() {
  23   Stop();
  24 }
  25
  26 void Throbber::Start() {
  27   if (IsRunning())
  28     return;
  29
  30   start_time_ = base::TimeTicks::Now();
  31   const int kFrameTimeMs = 30;
  32   timer_.Start(FROM_HERE, base::TimeDelta::FromMilliseconds(kFrameTimeMs), this,
  33                &Throbber::SchedulePaint);
  34   SchedulePaint();  // paint right away
  35 }
  36
  37 void Throbber::Stop() {
  38   if (!IsRunning())
  39     return;
  40
  41   timer_.Stop();
  42   SchedulePaint();
  43 }
  44
  45 void Throbber::SetChecked(bool checked) {
  46   if (checked == checked_)
  47     return;
  48
  49   checked_ = checked;
  50   SchedulePaint();
  51 }
  52
  53 gfx::Size Throbber::GetPreferredSize() const {
  54   const int kDefaultDiameter = 16;
  55   return gfx::Size(kDefaultDiameter, kDefaultDiameter);
  56 }
  57
  58 void Throbber::OnPaint(gfx::Canvas* canvas) {
  59   if (!IsRunning()) {
  60     if (checked_) {
  61       if (!checkmark_) {
  62         checkmark_ = ui::ResourceBundle::GetSharedInstance()
  63                          .GetImageNamed(IDR_CHECKMARK)
  64                          .ToImageSkia();
  65       }
  66
  67       int checkmark_x = (width() - checkmark_->width()) / 2;
  68       int checkmark_y = (height() - checkmark_->height()) / 2;
  69       canvas->DrawImageInt(*checkmark_, checkmark_x, checkmark_y);
  70     }
  71     return;
  72   }
  73
  74   SkColor color = GetNativeTheme()->GetSystemColor(
  75       ui::NativeTheme::kColorId_ThrobberSpinningColor);
  76   base::TimeDelta elapsed_time = base::TimeTicks::Now() - start_time_;
  77   gfx::PaintThrobberSpinning(canvas, GetContentsBounds(), color, elapsed_time);
  78 }
  79
  80 bool Throbber::IsRunning() const {
  81   return timer_.IsRunning();
  82 }
  83
  84 // Smoothed throbber ---------------------------------------------------------
  85
  86 // Delay after work starts before starting throbber, in milliseconds.
  87 static const int kStartDelay = 200;
  88
  89 // Delay after work stops before stopping, in milliseconds.
  90 static const int kStopDelay = 50;
  91
  92 SmoothedThrobber::SmoothedThrobber()
  93     : start_delay_ms_(kStartDelay), stop_delay_ms_(kStopDelay) {
  94 }
  95
  96 SmoothedThrobber::~SmoothedThrobber() {}
  97
  98 void SmoothedThrobber::Start() {
  99   stop_timer_.Stop();
 100
 101   if (!IsRunning() && !start_timer_.IsRunning()) {
 102     start_timer_.Start(FROM_HERE,
 103                        base::TimeDelta::FromMilliseconds(start_delay_ms_), this,
 104                        &SmoothedThrobber::StartDelayOver);
 105   }
 106 }
 107
 108 void SmoothedThrobber::StartDelayOver() {
 109   Throbber::Start();
 110 }
 111
 112 void SmoothedThrobber::Stop() {
 113   if (!IsRunning())
 114     start_timer_.Stop();
 115
 116   stop_timer_.Stop();
 117   stop_timer_.Start(FROM_HERE,
 118                     base::TimeDelta::FromMilliseconds(stop_delay_ms_), this,
 119                     &SmoothedThrobber::StopDelayOver);
 120 }
 121
 122 void SmoothedThrobber::StopDelayOver() {
 123   Throbber::Stop();
 124 }
 125
 126 }  // namespace views