flutter-todos/lib/widgets/custom_icon_widget.dart

import 'package:flutter/material.dart';
import 'package:flutter_colorpicker/flutter_colorpicker.dart';
import 'package:todo_list/i10n/localization_intl.dart';
import 'package:todo_list/utils/theme_util.dart';

class CustomIconWidget extends StatefulWidget {
  final IconData iconData;
  final Function onApplyTap;
  final Color pickerColor;
  final ValueChanged<String> onTextChange;
  final String iconName;

  CustomIconWidget({
    this.iconData,
    this.onApplyTap,
    this.pickerColor,
    this.onTextChange, this.iconName,
  })  : assert(iconData != null),
        assert(onApplyTap != null),
        assert(onTextChange != null),
        assert(pickerColor != null);

  @override
  _CustomIconWidgetState createState() => _CustomIconWidgetState();
}

class _CustomIconWidgetState extends State<CustomIconWidget> {
  final List<Color> defaultColors = [
    MyThemeColor.blueGrayColor,
    MyThemeColor.darkColor,
    MyThemeColor.greenColor,
    MyThemeColor.purpleColor,
    MyThemeColor.cyanColor,
    MyThemeColor.coffeeColor,
    MyThemeColor.defaultColor,
  ];

  Color currentIconColor;
  int currentSelectIndex;

  @override
  void initState() {
    super.initState();
    currentIconColor = widget.pickerColor;
    currentSelectIndex = -1;
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      height: 200,
      child: Column(
        children: <Widget>[
          Container(
            margin: EdgeInsets.all(10),
            width: 260,
            child: Form(
              autovalidateMode: AutovalidateMode.always,
              child: TextFormField(
                initialValue: widget.iconName ?? null,
                validator: (text){
                  widget.onTextChange(text);
                  return null;
                },
                style: TextStyle(textBaseline: TextBaseline.alphabetic),
                decoration: InputDecoration(
                  hintText: IntlLocalizations.of(context).setIconName,
                  prefixIcon: Icon(
                    widget.iconData,
                    color: currentIconColor,
                  ),
                ),
                maxLength: 20,
                maxLines: 1,
              ),
            ),
          ),
          SingleChildScrollView(
            scrollDirection: Axis.horizontal,
            child: Row(
              children: List.generate(defaultColors.length, (index) {
                return InkWell(
                  onTap: () {
                    setState(() {
                      currentSelectIndex = index;
                      currentIconColor = defaultColors[index];
                    });
                  },
                  child: Container(
                    width: 20,
                    height: 20,
                    margin: EdgeInsets.all(10),
                    decoration: BoxDecoration(
                      shape: BoxShape.circle,
                      color: defaultColors[index],
                      border: currentSelectIndex == index
                          ? Border.all(width: 2, color: Colors.black)
                          : null,
                    ),
                  ),
                );
              }),
            ),
          ),
          Container(
            child: Row(
              children: <Widget>[
                InkWell(
                  onTap: () {
                    _showColorPicker(context);
                  },
                  child: Container(
                    height: 35,
                    width: 35,
                    margin: EdgeInsets.all(10),
                    decoration: BoxDecoration(
                      gradient: LinearGradient(
                        colors: [
                          Colors.redAccent,
                          Colors.greenAccent,
                          Colors.blueAccent,
                        ],
                        begin: Alignment.topLeft,
                        end: Alignment.bottomRight,
                      ),
                      border: currentSelectIndex == 7
                          ? Border.all(color: currentIconColor, width: 4)
                          : null,
                      borderRadius: BorderRadius.all(Radius.circular(10)),
                    ),
                  ),
                ),
                Expanded(
                    flex: 2,
                    child: Container(
                      alignment: Alignment.centerRight,
                      child: FlatButton(
                        child: Text(
                          IntlLocalizations.of(context).cancel,
                          style: TextStyle(color: Colors.redAccent),
                        ),
                        onPressed: () {
                          Navigator.of(context).pop();
                        },
                      ),
                    )),
                Expanded(
                  flex: 2,
                  child: Container(
                    alignment: Alignment.centerRight,
                    child: FlatButton(
                      child: Text(
                        IntlLocalizations.of(context).ok,
                        style: TextStyle(color: Colors.black),
                      ),
                      onPressed: () {
                        widget.onApplyTap(currentIconColor);
                        Navigator.of(context).pop();
                      },
                    ),
                  ),
                ),
              ],
            ),
          )
        ],
      ),
    );
  }

  void _showColorPicker(BuildContext context) {
    showDialog(
        context: context,
        builder: (ctx) {
          return AlertDialog(
            shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.all(Radius.circular(20.0))),
            elevation: 0.0,
            title: Text(IntlLocalizations.of(context).pickAColor),
            content: SingleChildScrollView(
              child: ColorPicker(
                pickerColor: currentIconColor,
                onColorChanged: (color) {
                  currentIconColor = color;
                  currentSelectIndex = 7;
                },
                enableLabel: true,
                pickerAreaHeightPercent: 0.8,
              ),
            ),
            actions: <Widget>[
              FlatButton(
                child: Text(
                  IntlLocalizations.of(context).cancel,
                  style: TextStyle(color: Colors.redAccent),
                ),
                onPressed: () {
                  currentIconColor = widget.pickerColor;
                  currentSelectIndex = -1;
                  Navigator.of(context).pop();
                },
              ),
              FlatButton(
                child: Text(IntlLocalizations.of(context).ok),
                onPressed: () {
                  setState(() {});
                  Navigator.of(context).pop();
                },
              ),
            ],
          );
        });
  }
}