Refactor cros library code into central location and have the UI elements obs...

chrome/browser/chromeos/clock_menu_button.cc

+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/chromeos/clock_menu_button.h"
+
+#include "app/gfx/canvas.h"
+#include "app/gfx/font.h"
+#include "app/l10n_util.h"
+#include "app/resource_bundle.h"
+#include "base/string_util.h"
+#include "base/time.h"
+#include "base/time_format.h"
+#include "grit/generated_resources.h"
+
+// Amount of slop to add into the timer to make sure we're into the next minute
+// when the timer goes off.
+const int kTimerSlopSeconds = 1;
+
+ClockMenuButton::ClockMenuButton()
+    : MenuButton(NULL, std::wstring(), this, false),
+      clock_menu_(this) {
+  SetFont(ResourceBundle::GetSharedInstance().GetFont(
+      ResourceBundle::BaseFont).DeriveFont(0, gfx::Font::BOLD));
+  SetEnabledColor(SK_ColorWHITE);
+  SetShowHighlighted(false);
+  UpdateText();
+}
+
+void ClockMenuButton::SetNextTimer() {
+  // Try to set the timer to go off at the next change of the minute. We don't
+  // want to have the timer go off more than necessary since that will cause
+  // the CPU to wake up and consume power.
+  base::Time now = base::Time::Now();
+  base::Time::Exploded exploded;
+  now.LocalExplode(&exploded);
+
+  // Often this will be called at minute boundaries, and we'll actually want
+  // 60 seconds from now.
+  int seconds_left = 60 - exploded.second;
+  if (seconds_left == 0)
+    seconds_left = 60;
+
+  // Make sure that the timer fires on the next minute. Without this, if it is
+  // called just a teeny bit early, then it will skip the next minute.
+  seconds_left += kTimerSlopSeconds;
+
+  timer_.Start(base::TimeDelta::FromSeconds(seconds_left), this,
+               &ClockMenuButton::UpdateText);
+}
+
+void ClockMenuButton::UpdateText() {
+  base::Time::Exploded now;
+  base::Time::Now().LocalExplode(&now);
+  int hour = now.hour % 12;
+  if (hour == 0)
+    hour = 12;
+
+  std::wstring hour_str = IntToWString(hour);
+  std::wstring min_str = IntToWString(now.minute);
+  // Append a "0" before the minute if it's only a single digit.
+  if (now.minute < 10)
+    min_str = IntToWString(0) + min_str;
+  int msg = now.hour < 12 ? IDS_STATUSBAR_CLOCK_SHORT_TIME_AM :
+                            IDS_STATUSBAR_CLOCK_SHORT_TIME_PM;
+
+  std::wstring time_string = l10n_util::GetStringF(msg, hour_str, min_str);
+
+  SetText(time_string);
+  SchedulePaint();
+  SetNextTimer();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// ClockMenuButton, views::Menu2Model implementation:
+
+int ClockMenuButton::GetItemCount() const {
+  return 1;
+}
+
+views::Menu2Model::ItemType ClockMenuButton::GetTypeAt(int index) const {
+  return views::Menu2Model::TYPE_COMMAND;
+}
+
+string16 ClockMenuButton::GetLabelAt(int index) const {
+  return WideToUTF16(base::TimeFormatFriendlyDate(base::Time::Now()));
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// ClockMenuButton, views::ViewMenuDelegate implementation:
+
+void ClockMenuButton::RunMenu(views::View* source, const gfx::Point& pt,
+                              gfx::NativeView hwnd) {
+  clock_menu_.Rebuild();
+  clock_menu_.UpdateStates();
+  clock_menu_.RunMenuAt(pt, views::Menu2::ALIGN_TOPRIGHT);
+}