#12267 change scan flow

lib/screens/purchase_sum.dart

@@ -0,0 +1,202 @@
+import 'dart:convert';
+
+import 'package:checker/base/base_screen.dart';
+import 'package:checker/db.dart';
+import 'package:checker/screens/purchase.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:http/http.dart';
+import 'dart:core';
+
+import 'package:checker/resources.dart';
+import 'package:checker/strings.dart';
+import 'package:checker/common.dart';
+import 'package:checker/consts.dart';
+import 'package:checker/base/base_state.dart';
+import 'package:checker/network.dart';
+
+/// Экран ввода суммы покупки
+class PurchaseSumScreen extends BaseScreen {
+  PurchaseSumScreen(helper, app, this.token) : super(helper, app);
+
+  final String token;
+
+  @override
+  State createState() =>
+      new PurchaseSumScreenState<PurchaseSumScreen>(helper, app);
+}
+
+class PurchaseSumScreenState<T> extends BaseState<PurchaseSumScreen> {
+  TextEditingController _sumController = new TextEditingController();
+
+  bool isAutomaticallyImplyLeading() => false;
+
+  PurchaseSumScreenState(SqliteHelper helper, String app) : super(helper, app);
+
+  @override
+  void initState() {
+    super.initState();
+    _subscribe();
+  }
+
+  @override
+  Widget build(BuildContext ctx) {
+    return getMainWidget();
+  }
+
+  @override
+  Widget getScreenContent() => Column(
+        children: <Widget>[
+          getHintLabel(),
+          getInputField(),
+          wrapButton(
+              _getScreenMargins(24.0),
+              getScanButton(context, StringsLocalization.scan(),
+                  Resources.getPrimaryColor(app)))
+        ],
+      );
+
+  EdgeInsets _getScreenMargins(double top) {
+    double side = 42.0;
+    return new EdgeInsets.only(top: top, left: side, right: side);
+  }
+
+  Widget getScanButton(BuildContext context, String title, Color textColor) {
+    return new Container(
+        height: buttonHeight,
+        child: new FlatButton(
+            child: new Text(title, style: new TextStyle(color: textColor)),
+            onPressed: () => _startScanner()),
+        decoration: new BoxDecoration(
+            border: new Border.all(
+                color: Resources.getButtonColor(app), width: 1.0),
+            borderRadius: new BorderRadius.all(new Radius.circular(4.0))));
+  }
+
+  void _startScanner() {
+    platform.invokeMethod('getEndpoint').then((url) {
+      platform.invokeMethod('getAppToken').then((appToken) {
+        Map<String, String> args = StringsLocalization.strings;
+        args['token'] = widget.token;
+        args['url'] = url;
+        args['appToken'] = appToken;
+        args['localeCode'] = StringsLocalization.localeCode;
+        args['color'] = Resources.getPrimaryColor(app).value.toString();
+        platform.invokeMethod('startScanner', args).then((result) {
+          _processResult(result);
+        });
+      });
+    });
+  }
+
+  @override
+  String getTitle() {
+    return StringsLocalization.sum();
+  }
+
+  @override
+  getHintString() {
+    return StringsLocalization.sum();
+  }
+
+  @override
+  getTextWidget() {
+    return new TextField(
+        keyboardType: TextInputType.number,
+        decoration: new InputDecoration.collapsed(
+            hintText: getHintString(),
+            hintStyle: new TextStyle(color: greyTextColor, fontSize: 16.0)),
+        controller: _sumController,
+        onSubmitted: (String text) {
+          setState(() {
+            _sumController.text = _parseSum(text);
+          });
+        },
+        textAlign: TextAlign.center);
+  }
+
+  String _cleanupNumber(String text) {
+    String tmp = text
+        .replaceAll(' ', '')
+        .replaceAll('-', '')
+        .replaceAll(',', '.')
+        .replaceAll('..', '.');
+
+    while (tmp.indexOf('..') != -1) {
+      tmp = tmp.replaceAll('..', '.');
+    }
+    return tmp;
+  }
+
+  String _parseSum(String input) {
+    num sumTotal = 0.0;
+    String text = _cleanupNumber(input);
+
+    try {
+      sumTotal = num.parse(text);
+    } catch (exception) {
+      print(exception);
+      try {
+        int idx = text.indexOf('.');
+        String integerPart = text.substring(0, idx);
+        String fractionalPart = text.substring(idx + 1, text.length);
+        if (fractionalPart.length > 2) {
+          fractionalPart = fractionalPart.substring(0, 2);
+        }
+        return '$integerPart.$fractionalPart';
+      } catch (exception) {
+        print(exception);
+      }
+    }
+    print(sumTotal.toStringAsFixed(2));
+    return sumTotal.toStringAsFixed(2);
+  }
+
+  void _processResult(result) {
+    if (result is List) {
+      final String user = result[0] as String;
+      final String card = result[1] as String;
+      Navigator.of(context).push(new MaterialPageRoute(builder: (context) {
+        String sum = _parseSum(_sumController.text);
+        _sumController.text = "";
+        return PurchaseScreen(helper, app, user, card, sum);
+      }));
+    }
+  }
+
+  void _subscribe() async {
+    platform.setMethodCallHandler((MethodCall call) async {
+      if (call.method == 'findUser') {
+        try {
+          Response userResponse;
+
+          switch (call.arguments[1]) {
+            case 'card':
+              userResponse = await getUserByCard(call.arguments[0], widget.token);
+              break;
+            case 'phone':
+              userResponse = await getUserByPhone(call.arguments[0], widget.token);
+              break;
+          }
+
+          if (userResponse != null) {
+            print('I have user in method handler!');
+            List<dynamic> users = json.decode(userResponse.body);
+            if (users.length > 0) {
+              return json.encode(users[0]);
+            } else {
+              throw new FlutterError("Users not found");
+            }
+          } else {
+            throw new FlutterError("Users not found");
+          }
+        } catch (error) {
+          print(error.toString());
+          throw new FlutterError("Users not found");
+        }
+      } else if (call.method == 'scanSuccess') {
+        _processResult(call.arguments);
+      }
+    });
+  }
+}