lift-app/lib/utils/utils.dart

import 'dart:convert';

//import 'package:barcode_scan/barcode_scan.dart';
import 'package:crypto/crypto.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:liftmanager/utils/theme_utils.dart';
import 'package:liftmanager/utils/toast.dart';
import 'package:keyboard_actions/keyboard_actions.dart';
import 'package:url_launcher/url_launcher.dart';
import "package:intl/intl.dart";

class Utils {

  // md5 加密
  static String generateMd5(String str) {
    return md5.convert(utf8.encode(str)).toString();
  }

  /// 调起拨号页
  static void launchTelURL(String phone) async {
    String url = 'tel:'+ phone;
    if (await canLaunch(url)) {
      await launch(url);
    } else {
      toasts('拨号失败！');
    }
  }

  /// 调起二维码扫描页
//  static Future<String> scan() async {
//    try {
//      return await BarcodeScanner.scan();
//    } catch (e) {
//      if (e is PlatformException){
//        if (e.code == BarcodeScanner.CameraAccessDenied) {
//          toasts("没有相机权限！");
//        }
//      }
//    }
//    return null;
//  }

  static KeyboardActionsConfig getKeyboardActionsConfig(BuildContext context, List<FocusNode> list){
    return KeyboardActionsConfig(
      keyboardActionsPlatform: KeyboardActionsPlatform.IOS,
      keyboardBarColor: ThemeUtils.getKeyboardActionsColor(context),
      nextFocus: true,
      actions: List.generate(list.length, (i) => KeyboardAction(
        focusNode: list[i],
        closeWidget: const Padding(
          padding: const EdgeInsets.all(5.0),
          child: const Text("关闭"),
        ),
      )),
    );
  }

  static final DateFormat _monthFormat = new DateFormat("yyyy年MM月");
  static final DateFormat _dayFormat = new DateFormat("dd");
  static final DateFormat _firstDayFormat = new DateFormat("MMM dd");
  static final DateFormat _fullDayFormat = new DateFormat("EEE MMM dd, yyyy");
  static final DateFormat _apiDayFormat = new DateFormat("yyyy-MM-dd");

  static String formatMonth(DateTime d) => _monthFormat.format(d);
  static String formatDay(DateTime d) => _dayFormat.format(d);
  static String formatFirstDay(DateTime d) => _firstDayFormat.format(d);
  static String fullDayFormat(DateTime d) => _fullDayFormat.format(d);
  static String apiDayFormat(DateTime d) => _apiDayFormat.format(d);

  static const List<String> weekdays = const [
    "日",
    "一",
    "二",
    "三",
    "四",
    "五",
    "六"
  ];

  static List<DateTime> daysInMonth(DateTime month) {
    var first = firstDayOfMonth(month);
    var daysBefore = first.weekday;
    var firstToDisplay = first.subtract(new Duration(days: daysBefore));
    var last = Utils.lastDayOfMonth(month);

    var daysAfter = 7 - last.weekday;

    // If the last day is sunday (7) the entire week must be rendered
    if (daysAfter == 0) {
      daysAfter = 7;
    }

    var lastToDisplay = last.add(new Duration(days: daysAfter));
    return daysInRange(firstToDisplay, lastToDisplay).toList();
  }
  static bool isFirstDayOfMonth(DateTime day) {
    return isSameDay(firstDayOfMonth(day), day);
  }

  static bool isLastDayOfMonth(DateTime day) {
    return isSameDay(lastDayOfMonth(day), day);
  }

  static DateTime firstDayOfMonth(DateTime month) {
    return new DateTime(month.year, month.month);
  }

  static DateTime firstDayOfWeek(DateTime day) {
    /// Handle Daylight Savings by setting hour to 12:00 Noon
    /// rather than the default of Midnight
    day = new DateTime.utc(day.year, day.month, day.day, 12);

    /// Weekday is on a 1-7 scale Monday - Sunday,
    /// This Calendar works from Sunday - Monday
    var decreaseNum = day.weekday % 7;
    return day.subtract(new Duration(days: decreaseNum));
  }

  static DateTime lastDayOfWeek(DateTime day) {
    /// Handle Daylight Savings by setting hour to 12:00 Noon
    /// rather than the default of Midnight
    day = new DateTime.utc(day.year, day.month, day.day, 12);

    /// Weekday is on a 1-7 scale Monday - Sunday,
    /// This Calendar's Week starts on Sunday
    var increaseNum = day.weekday % 7;
    return day.add(new Duration(days: 7 - increaseNum));
  }

  /// The last day of a given month
  static DateTime lastDayOfMonth(DateTime month) {
    var beginningNextMonth = (month.month < 12)
        ? new DateTime(month.year, month.month + 1, 1)
        : new DateTime(month.year + 1, 1, 1);
    return beginningNextMonth.subtract(new Duration(days: 1));
  }

  /// Returns a [DateTime] for each day the given range.
  ///
  /// [start] inclusive
  /// [end] exclusive
  static Iterable<DateTime> daysInRange(DateTime start, DateTime end) sync* {
    var i = start;
    var offset = start.timeZoneOffset;
    while (i.isBefore(end)) {
      yield i;
      i = i.add(new Duration(days: 1));
      var timeZoneDiff = i.timeZoneOffset - offset;
      if (timeZoneDiff.inSeconds != 0) {
        offset = i.timeZoneOffset;
        i = i.subtract(new Duration(seconds: timeZoneDiff.inSeconds));
      }
    }
  }

  /// Whether or not two times are on the same day.
  static bool isSameDay(DateTime a, DateTime b) {
    return a.year == b.year && a.month == b.month && a.day == b.day;
  }

  static bool isSameWeek(DateTime a, DateTime b) {
    /// Handle Daylight Savings by setting hour to 12:00 Noon
    /// rather than the default of Midnight
    a = new DateTime.utc(a.year, a.month, a.day);
    b = new DateTime.utc(b.year, b.month, b.day);

    var diff = a.toUtc().difference(b.toUtc()).inDays;
    if (diff.abs() >= 7) {
      return false;
    }

    var min = a.isBefore(b) ? a : b;
    var max = a.isBefore(b) ? b : a;
    var result = max.weekday % 7 - min.weekday % 7 >= 0;
    return result;
  }

  static DateTime previousMonth(DateTime m) {
    var year = m.year;
    var month = m.month;
    if (month == 1) {
      year--;
      month = 12;
    } else {
      month--;
    }
    return new DateTime(year, month);
  }

  static DateTime nextMonth(DateTime m) {
    var year = m.year;
    var month = m.month;

    if (month == 12) {
      year++;
      month = 1;
    } else {
      month++;
    }
    return new DateTime(year, month);
  }

  static DateTime previousWeek(DateTime w) {
    return w.subtract(new Duration(days: 7));
  }

  static DateTime nextWeek(DateTime w) {
    return w.add(new Duration(days: 7));
  }

}

/// 默认dialog背景色为半透明黑色，这里修改源码改为透明
Future<T> showTransparentDialog<T>({
  @required BuildContext context,
  bool barrierDismissible = true,
  WidgetBuilder builder,
}) {

  final ThemeData theme = Theme.of(context, shadowThemeOnly: true);
  return showGeneralDialog(
    context: context,
    pageBuilder: (BuildContext buildContext, Animation<double> animation, Animation<double> secondaryAnimation) {
      final Widget pageChild = Builder(builder: builder);
      return SafeArea(
        child: Builder(
            builder: (BuildContext context) {
              return theme != null
                  ? Theme(data: theme, child: pageChild)
                  : pageChild;
            }
        ),
      );
    },
    barrierDismissible: barrierDismissible,
    barrierLabel: MaterialLocalizations.of(context).modalBarrierDismissLabel,
    barrierColor: const Color(0x00FFFFFF),
    transitionDuration: const Duration(milliseconds: 150),
    transitionBuilder: _buildMaterialDialogTransitions,
  );
}

Widget _buildMaterialDialogTransitions(BuildContext context, Animation<double> animation, Animation<double> secondaryAnimation, Widget child) {
  return FadeTransition(
    opacity: CurvedAnimation(
      parent: animation,
      curve: Curves.easeOut,
    ),
    child: child,
  );
}

Future<T> showElasticDialog<T>({
  @required BuildContext context,
  bool barrierDismissible = true,
  WidgetBuilder builder,
}) {

  final ThemeData theme = Theme.of(context, shadowThemeOnly: true);
  return showGeneralDialog(
    context: context,
    pageBuilder: (BuildContext buildContext, Animation<double> animation, Animation<double> secondaryAnimation) {
      final Widget pageChild = Builder(builder: builder);
      return SafeArea(
        child: Builder(
            builder: (BuildContext context) {
              return theme != null
                  ? Theme(data: theme, child: pageChild)
                  : pageChild;
            }
        ),
      );
    },
    barrierDismissible: barrierDismissible,
    barrierLabel: MaterialLocalizations.of(context).modalBarrierDismissLabel,
    barrierColor: Colors.black54,
    transitionDuration: const Duration(milliseconds: 550),
    transitionBuilder: _buildDialogTransitions,
  );
}

Widget _buildDialogTransitions(BuildContext context, Animation<double> animation, Animation<double> secondaryAnimation, Widget child) {
  return FadeTransition(
    opacity: CurvedAnimation(
      parent: animation,
      curve: Curves.easeOut,
    ),
    child: SlideTransition(
      position: Tween<Offset>(
          begin: const Offset(0.0, 0.3),
          end: Offset.zero
      ).animate(CurvedAnimation(
        parent: animation,
        curve: animation.status != AnimationStatus.forward ? Curves.easeOutBack: ElasticOutCurve(0.85),
      )),
      child: child,
    ),
  );
}