Dynamic Drawer List

keeper_drawer.dart

import 'package:flutter/material.dart';
import 'package:keeper/views/label_form.dart';
import 'package:keeper/views/label_view.dart';

const String _AccountName = 'Aravind Vemula';
const String _AccountEmail = 'vemula.aravind336@gmail.com';
const String _AccountAbbr = 'AV';

class KeeperDrawer extends StatelessWidget {
  final List<String> labels;
  KeeperDrawer({this.labels});
  
  @override
  Widget build(BuildContext context) {
    return new Drawer(
      child: new ListView(
        padding: const EdgeInsets.only(top: 0.0),
        children: _buildDrawerList(context)
      )
    );
  }
  
  _onTapOtherAccounts(BuildContext context) {
    Navigator.of(context).pop();
    showDialog<Null>(
      context: context,
      child: new AlertDialog(
        title: const Text('Account switching not implemented.'),
        actions: <Widget>[
          new FlatButton(
            child: const Text('OK'),
            onPressed: () {
              Navigator.of(context).pop();
            },
          ),
        ],
      ),
    );
  }
  
  _onListTileTap(BuildContext context, String title) {
    Navigator.of(context).popUntil(ModalRoute.withName('/'));
    Navigator.of(context).push(
      new PageRouteBuilder(
        pageBuilder: (BuildContext context, _, __) {
          return new LabelView(title: title);
        },
        transitionsBuilder: (_, Animation<double> animation, __, Widget child) {
          return new FadeTransition(
            opacity: animation,
            child: child
          );
        }
      )
    );
  }
  
  _onTapCreateOrEditLabel(BuildContext context) {
    Navigator.pop(context);
    Navigator.of(context).pushNamed(LabelForm.routeName);
  }
	
  List<Widget> _buildDrawerList(BuildContext context) {
    List<Widget> children = [];
    children..addAll(_buildUserAccounts(context))
      ..addAll(_defaultLabels(context))
      ..addAll([new Divider()])
      ..addAll(_buildLabelWidgets(context))
      ..addAll([new Divider()])
      ..addAll(_buildActions(context))
      ..addAll([new Divider()])
      ..addAll(_buildSettingAndHelp(context));
    return children;
  }
  
  List<Widget> _buildUserAccounts(BuildContext context) {
    return [
      new UserAccountsDrawerHeader(
        accountName: const Text(_AccountName),
        accountEmail: const Text(_AccountEmail),
        currentAccountPicture: new CircleAvatar(
          backgroundColor: Colors.brown,
          child: new Text(_AccountAbbr)
        ),
        otherAccountsPictures: <Widget>[
          new GestureDetector(
            onTap: () => _onTapOtherAccounts(context),
            child: new Semantics(
              label: 'Switch Account',
              child: new CircleAvatar(
                backgroundColor: Colors.brown,
                child: new Text('SA'),
              ),
            ),
          )
        ]
      )
    ];
  }
	
  List<Widget> _defaultLabels(BuildContext context) {
    String notes = 'Notes';
    return [
      new ListTile(
        leading: new Icon(Icons.lightbulb_outline),
        title: new Text(notes),
        onTap: () => _onListTileTap(context, notes),
      )
    ];
  }
  
  List<Widget> _buildLabelWidgets(BuildContext context) {
    List<Widget> labelListTiles = [];
    labelListTiles.add(
      new ListTile(
        leading: new Text('Label'),
        trailing: new Text(
          'EDIT'
        ),
        onTap: () => _onTapCreateOrEditLabel(context),
      )
    );
    labels.forEach((labelName) {
      labelListTiles.add(
        new ListTile(
          leading: new Icon(Icons.label),
          title: new Text(labelName),
          onTap: () => _onListTileTap(context, labelName),
        )
      );
    });
    labelListTiles.add(
      new ListTile(
        leading: new Icon(Icons.add),
        title: new Text('Create new label'),
        onTap: () => _onTapCreateOrEditLabel(context),
      )
    );
    return labelListTiles;
  }
	
  List<Widget> _buildActions(BuildContext context) {
    String archive = 'Archive';
    String trash = 'Trash';
    return [
      new ListTile(
        leading: new Icon(Icons.archive),
        title: new Text(archive),
        onTap: () => _onListTileTap(context, archive),
      ),
      new ListTile(
        leading: new Icon(Icons.delete),
        title: new Text(trash),
        onTap: () => _onListTileTap(context, trash),
      )
    ];
  }
  
  List<Widget> _buildSettingAndHelp(BuildContext context) {
    String settings = 'Settings';
    String helpAndFeedBack = 'Help & feedback';
    return [
      new ListTile(
        leading: new Icon(Icons.settings),
        title: new Text(settings),
        onTap: () => _onListTileTap(context, settings),
      ),
      new ListTile(
        leading: new Icon(Icons.help),
        title: new Text(helpAndFeedBack),
        onTap: () => _onListTileTap(context, helpAndFeedBack),
      )
    ];
  }
}