Start working on a TimePicker

You can't actually pick a time with the time picker yet, but this patch adds
most of the plumbing.

examples/material_gallery/lib/main.dart

@@ -5,14 +5,16 @@
 import 'package:flutter/material.dart';
 
 import 'chip_demo.dart';
-import 'gallery_page.dart';
 import 'date_picker_demo.dart';
+import 'gallery_page.dart';
+import 'time_picker_demo.dart';
 import 'widget_demo.dart';
 import 'drop_down_demo.dart';
 
 final List<WidgetDemo> _kDemos = <WidgetDemo>[
   kChipDemo,
   kDatePickerDemo,
+  kTimePickerDemo,
   kDropDownDemo,
 ];
 

examples/material_gallery/lib/time_picker_demo.dart

+// Copyright 2015 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.
+
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+
+import 'widget_demo.dart';
+
+class TimePickerDemo extends StatefulComponent {
+  _TimePickerDemoState createState() => new _TimePickerDemoState();
+}
+
+class _TimePickerDemoState extends State<TimePickerDemo> {
+  TimeOfDay _selectedTime = const TimeOfDay(hour: 7, minute: 28);
+
+  Future _handleSelectTime() async {
+    TimeOfDay picked = await showTimePicker(
+      context: context,
+      initialTime: _selectedTime
+    );
+    if (picked != _selectedTime) {
+      setState(() {
+        _selectedTime = picked;
+      });
+    }
+  }
+
+  Widget build(BuildContext context) {
+    return new Column([
+      new Text('${_selectedTime.hour}:${_selectedTime.minute}'),
+      new RaisedButton(
+        onPressed: _handleSelectTime,
+        child: new Text('SELECT TIME')
+      ),
+    ], justifyContent: FlexJustifyContent.center);
+  }
+}
+
+final WidgetDemo kTimePickerDemo = new WidgetDemo(
+  title: 'Time Picker',
+  routeName: '/time-picker',
+  builder: (_) => new TimePickerDemo()
+);

packages/flutter/lib/material.dart

@@ -50,6 +50,8 @@ export 'src/material/switch.dart';
 export 'src/material/tabs.dart';
 export 'src/material/theme.dart';
 export 'src/material/theme_data.dart';
+export 'src/material/time_picker.dart';
+export 'src/material/time_picker_dialog.dart';
 export 'src/material/title.dart';
 export 'src/material/tool_bar.dart';
 export 'src/material/typography.dart';

packages/flutter/lib/src/material/date_picker.dart

@@ -14,9 +14,7 @@ import 'ink_well.dart';
 import 'theme.dart';
 import 'typography.dart';
 
-enum DatePickerMode { day, year }
-
-typedef void DatePickerModeChanged(DatePickerMode value);
+enum _DatePickerMode { day, year }
 
 class DatePicker extends StatefulComponent {
   DatePicker({
@@ -39,9 +37,9 @@ class DatePicker extends StatefulComponent {
 }
 
 class _DatePickerState extends State<DatePicker> {
-  DatePickerMode _mode = DatePickerMode.day;
+  _DatePickerMode _mode = _DatePickerMode.day;
 
-  void _handleModeChanged(DatePickerMode mode) {
+  void _handleModeChanged(_DatePickerMode mode) {
     userFeedback.performHapticFeedback(HapticFeedbackType.VIRTUAL_KEY);
     setState(() {
       _mode = mode;
@@ -51,7 +49,7 @@ class _DatePickerState extends State<DatePicker> {
   void _handleYearChanged(DateTime dateTime) {
     userFeedback.performHapticFeedback(HapticFeedbackType.VIRTUAL_KEY);
     setState(() {
-      _mode = DatePickerMode.day;
+      _mode = _DatePickerMode.day;
     });
     if (config.onChanged != null)
       config.onChanged(dateTime);
@@ -73,7 +71,7 @@ class _DatePickerState extends State<DatePicker> {
     );
     Widget picker;
     switch (_mode) {
-      case DatePickerMode.day:
+      case _DatePickerMode.day:
         picker = new MonthPicker(
           selectedDate: config.selectedDate,
           onChanged: _handleDayChanged,
@@ -82,7 +80,7 @@ class _DatePickerState extends State<DatePicker> {
           itemExtent: _calendarHeight
         );
         break;
-      case DatePickerMode.year:
+      case _DatePickerMode.year:
         picker = new YearPicker(
           selectedDate: config.selectedDate,
           onChanged: _handleYearChanged,
@@ -110,10 +108,10 @@ class _DatePickerHeader extends StatelessComponent {
   }
 
   DateTime selectedDate;
-  DatePickerMode mode;
-  DatePickerModeChanged onModeChanged;
+  _DatePickerMode mode;
+  ValueChanged<_DatePickerMode> onModeChanged;
 
-  void _handleChangeMode(DatePickerMode value) {
+  void _handleChangeMode(_DatePickerMode value) {
     if (value != mode)
       onModeChanged(value);
   }
@@ -125,12 +123,12 @@ class _DatePickerHeader extends StatelessComponent {
     Color yearColor;
     switch(theme.primaryColorBrightness) {
       case ThemeBrightness.light:
-        dayColor = mode == DatePickerMode.day ? Colors.black87 : Colors.black54;
-        yearColor = mode == DatePickerMode.year ? Colors.black87 : Colors.black54;
+        dayColor = mode == _DatePickerMode.day ? Colors.black87 : Colors.black54;
+        yearColor = mode == _DatePickerMode.year ? Colors.black87 : Colors.black54;
         break;
       case ThemeBrightness.dark:
-        dayColor = mode == DatePickerMode.day ? Colors.white : Colors.white70;
-        yearColor = mode == DatePickerMode.year ? Colors.white : Colors.white70;
+        dayColor = mode == _DatePickerMode.day ? Colors.white : Colors.white70;
+        yearColor = mode == _DatePickerMode.year ? Colors.white : Colors.white70;
         break;
     }
     TextStyle dayStyle = headerTheme.display3.copyWith(color: dayColor, height: 1.0, fontSize: 100.0);
@@ -142,15 +140,15 @@ class _DatePickerHeader extends StatelessComponent {
       decoration: new BoxDecoration(backgroundColor: theme.primaryColor),
       child: new Column(<Widget>[
         new GestureDetector(
-          onTap: () => _handleChangeMode(DatePickerMode.day),
+          onTap: () => _handleChangeMode(_DatePickerMode.day),
           child: new Text(new DateFormat("MMM").format(selectedDate).toUpperCase(), style: monthStyle)
         ),
         new GestureDetector(
-          onTap: () => _handleChangeMode(DatePickerMode.day),
+          onTap: () => _handleChangeMode(_DatePickerMode.day),
           child: new Text(new DateFormat("d").format(selectedDate), style: dayStyle)
         ),
         new GestureDetector(
-          onTap: () => _handleChangeMode(DatePickerMode.year),
+          onTap: () => _handleChangeMode(_DatePickerMode.year),
           child: new Text(new DateFormat("yyyy").format(selectedDate), style: yearStyle)
         )
       ])

packages/flutter/lib/src/material/time_picker.dart

+// Copyright 2015 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.
+
+import 'package:flutter/services.dart';
+import 'package:flutter/widgets.dart';
+
+import 'colors.dart';
+import 'theme.dart';
+import 'typography.dart';
+
+class TimeOfDay {
+  const TimeOfDay({ this.hour, this.minute });
+
+  /// The selected hour, in 24 hour time from 0..23
+  final int hour;
+
+  /// The selected minute.
+  final int minute;
+}
+
+enum _TimePickerMode { hour, minute }
+
+class TimePicker extends StatefulComponent {
+  TimePicker({
+    this.selectedTime,
+    this.onChanged
+  }) {
+    assert(selectedTime != null);
+  }
+
+  final TimeOfDay selectedTime;
+  final ValueChanged<TimeOfDay> onChanged;
+
+  _TimePickerState createState() => new _TimePickerState();
+}
+
+class _TimePickerState extends State<TimePicker> {
+  _TimePickerMode _mode = _TimePickerMode.hour;
+
+  void _handleModeChanged(_TimePickerMode mode) {
+    userFeedback.performHapticFeedback(HapticFeedbackType.VIRTUAL_KEY);
+    setState(() {
+      _mode = mode;
+    });
+  }
+
+  Widget build(BuildContext context) {
+    Widget header = new _TimePickerHeader(
+      selectedTime: config.selectedTime,
+      mode: _mode,
+      onModeChanged: _handleModeChanged
+    );
+    return new Column(<Widget>[
+      header,
+      new AspectRatio(
+        aspectRatio: 1.0,
+        child: new Container(
+          margin: const EdgeDims.all(12.0),
+          decoration: new BoxDecoration(
+            backgroundColor: Colors.grey[300],
+            shape: Shape.circle
+          )
+        )
+      )
+    ], alignItems: FlexAlignItems.stretch);
+  }
+
+}
+
+// Shows the selected date in large font and toggles between year and day mode
+class _TimePickerHeader extends StatelessComponent {
+  _TimePickerHeader({ this.selectedTime, this.mode, this.onModeChanged }) {
+    assert(selectedTime != null);
+    assert(mode != null);
+  }
+
+  TimeOfDay selectedTime;
+  _TimePickerMode mode;
+  ValueChanged<_TimePickerMode> onModeChanged;
+
+  void _handleChangeMode(_TimePickerMode value) {
+    if (value != mode)
+      onModeChanged(value);
+  }
+
+  Widget build(BuildContext context) {
+    ThemeData theme = Theme.of(context);
+    TextTheme headerTheme = theme.primaryTextTheme;
+
+    Color activeColor;
+    Color inactiveColor;
+    switch(theme.primaryColorBrightness) {
+      case ThemeBrightness.light:
+        activeColor = Colors.black87;
+        inactiveColor = Colors.black54;
+        break;
+      case ThemeBrightness.dark:
+        activeColor = Colors.white;
+        inactiveColor = Colors.white70;
+        break;
+    }
+    TextStyle activeStyle = headerTheme.display3.copyWith(color: activeColor, height: 1.0);
+    TextStyle inactiveStyle = headerTheme.display3.copyWith(color: inactiveColor, height: 1.0);
+
+    TextStyle hourStyle = mode == _TimePickerMode.hour ? activeStyle : inactiveStyle;
+    TextStyle minuteStyle = mode == _TimePickerMode.minute ? activeStyle : inactiveStyle;
+
+    return new Container(
+      padding: new EdgeDims.all(10.0),
+      decoration: new BoxDecoration(backgroundColor: theme.primaryColor),
+      child: new Row(<Widget>[
+        new GestureDetector(
+          onTap: () => _handleChangeMode(_TimePickerMode.hour),
+          child: new Text(selectedTime.hour.toString(), style: hourStyle)
+        ),
+        new Text(':', style: inactiveStyle),
+        new GestureDetector(
+          onTap: () => _handleChangeMode(_TimePickerMode.minute),
+          child: new Text(selectedTime.minute.toString(), style: minuteStyle)
+        ),
+      ], justifyContent: FlexJustifyContent.end)
+    );
+  }
+}

packages/flutter/lib/src/material/time_picker_dialog.dart

+// Copyright 2015 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.
+
+import 'dart:async';
+
+import 'package:flutter/widgets.dart';
+
+import 'dialog.dart';
+import 'time_picker.dart';
+import 'flat_button.dart';
+
+class _TimePickerDialog extends StatefulComponent {
+  _TimePickerDialog({
+    Key key,
+    this.initialTime
+  }) : super(key: key);
+
+  final TimeOfDay initialTime;
+
+  _TimePickerDialogState createState() => new _TimePickerDialogState();
+}
+
+class _TimePickerDialogState extends State<_TimePickerDialog> {
+  void initState() {
+    super.initState();
+    _selectedTime = config.initialTime;
+  }
+
+  TimeOfDay _selectedTime;
+
+  void _handleCancel() {
+    Navigator.of(context).pop();
+  }
+
+  void _handleOk() {
+    Navigator.of(context).pop(_selectedTime);
+  }
+
+  Widget build(BuildContext context) {
+    return new Dialog(
+      content: new TimePicker(
+        selectedTime: _selectedTime
+      ),
+      contentPadding: EdgeDims.zero,
+      actions: <Widget>[
+        new FlatButton(
+          child: new Text('CANCEL'),
+          onPressed: _handleCancel
+        ),
+        new FlatButton(
+          child: new Text('OK'),
+          onPressed: _handleOk
+        ),
+      ]
+    );
+  }
+}
+
+Future<TimeOfDay> showTimePicker({
+  BuildContext context,
+  TimeOfDay initialTime
+}) async {
+  return await showDialog(
+    context: context,
+    child: new _TimePickerDialog(initialTime: initialTime)
+  ) ?? initialTime;
+}