athena/system/time_view.cc

   1 // Copyright 2014 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 "athena/system/time_view.h"
   6
   7 #include "base/i18n/time_formatting.h"
   8 #include "third_party/skia/include/core/SkColor.h"
   9 #include "ui/views/border.h"
  10
  11 namespace athena {
  12 namespace {
  13
  14 // Amount of slop to add into the timer to make sure we're into the next minute
  15 // when the timer goes off.
  16 const int kTimerSlopSeconds = 1;
  17
  18 }  // namespace
  19
  20 TimeView::TimeView(SystemUI::ColorScheme color_scheme) {
  21   SetHorizontalAlignment(gfx::ALIGN_LEFT);
  22   SetEnabledColor((color_scheme == SystemUI::COLOR_SCHEME_LIGHT)
  23                       ? SK_ColorWHITE
  24                       : SK_ColorDKGRAY);
  25   SetAutoColorReadabilityEnabled(false);
  26   SetFontList(gfx::FontList().DeriveWithStyle(gfx::Font::BOLD));
  27   SetSubpixelRenderingEnabled(false);
  28
  29   const int kHorizontalSpacing = 10;
  30   const int kVerticalSpacing = 3;
  31   SetBorder(views::Border::CreateEmptyBorder(kVerticalSpacing,
  32                                              kHorizontalSpacing,
  33                                              kVerticalSpacing,
  34                                              kHorizontalSpacing));
  35
  36   UpdateText();
  37 }
  38
  39 TimeView::~TimeView() {
  40 }
  41
  42 void TimeView::SetTimer(base::Time now) {
  43   // Try to set the timer to go off at the next change of the minute. We don't
  44   // want to have the timer go off more than necessary since that will cause
  45   // the CPU to wake up and consume power.
  46   base::Time::Exploded exploded;
  47   now.LocalExplode(&exploded);
  48
  49   // Often this will be called at minute boundaries, and we'll actually want
  50   // 60 seconds from now.
  51   int seconds_left = 60 - exploded.second;
  52   if (seconds_left == 0)
  53     seconds_left = 60;
  54
  55   // Make sure that the timer fires on the next minute. Without this, if it is
  56   // called just a teeny bit early, then it will skip the next minute.
  57   seconds_left += kTimerSlopSeconds;
  58
  59   timer_.Stop();
  60   timer_.Start(
  61       FROM_HERE, base::TimeDelta::FromSeconds(seconds_left),
  62       this, &TimeView::UpdateText);
  63 }
  64
  65 void TimeView::UpdateText() {
  66   base::Time now = base::Time::Now();
  67   SetText(base::TimeFormatTimeOfDayWithHourClockType(
  68       now, base::k12HourClock, base::kKeepAmPm));
  69   SetTimer(now);
  70 }
  71
  72 }  // namespace athena