Can create surveys

lib/ui/dialogs/new_survey_dialog.dart

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+import 'package:comunic/models/new_post.dart';
+import 'package:comunic/utils/intl_utils.dart';
+import 'package:flutter/material.dart';
+
+/// Create a new survey dialog
+///
+/// @author Pierre Hubert
+
+/// Show a dialog to prompt information about a new survey to create
+Future<NewSurvey> showNewSurveyDialog(
+    {@required BuildContext context, NewSurvey initialSurvey}) async {
+  return await showDialog<NewSurvey>(
+      context: context,
+      builder: (c) => _SurveyDialog(
+            initialSurvey: initialSurvey,
+          ));
+}
+
+class _SurveyDialog extends StatefulWidget {
+  final NewSurvey initialSurvey;
+
+  const _SurveyDialog({Key key, this.initialSurvey}) : super(key: key);
+
+  @override
+  __SurveyDialogState createState() => __SurveyDialogState();
+}
+
+class __SurveyDialogState extends State<_SurveyDialog> {
+  TextEditingController _questionController;
+  final _choiceController = TextEditingController();
+  var _choices = Set<String>();
+
+  bool get canConfirm =>
+      _questionController.text.length > 2 && _choices.length > 1;
+
+  NewSurvey get newSurvey =>
+      NewSurvey(question: _questionController.text, answers: _choices);
+
+  @override
+  void initState() {
+    super.initState();
+    _questionController = TextEditingController(
+      text: widget.initialSurvey == null ? "" : widget.initialSurvey.question,
+    );
+    if (widget.initialSurvey != null) _choices = widget.initialSurvey.answers;
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return AlertDialog(
+      title: Text(tr("New survey")),
+      content: _buildBody(),
+      actions: <Widget>[
+        // Cancel
+        MaterialButton(
+          onPressed: () => Navigator.of(context).pop(),
+          child: Text(tr("Cancel").toUpperCase()),
+        ),
+
+        // Confirm
+        MaterialButton(
+          onPressed:
+              canConfirm ? () => Navigator.of(context).pop(newSurvey) : null,
+          child: Text(tr("Confirm").toUpperCase()),
+        ),
+      ],
+    );
+  }
+
+  Widget _buildBody() {
+    return ConstrainedBox(
+      constraints:
+          BoxConstraints(maxHeight: MediaQuery.of(context).size.height - 50),
+      child: SingleChildScrollView(
+        child: Column(
+            crossAxisAlignment: CrossAxisAlignment.stretch,
+            children: <Widget>[
+              // Survey question
+              TextField(
+                controller: _questionController,
+                onChanged: (s) => setState(() {}),
+                decoration: InputDecoration(
+                    alignLabelWithHint: true, labelText: tr("Question")),
+              ),
+
+              Container(height: 30),
+              Text(tr("Current choices:")),
+              _buildCurrentChoices(),
+
+              Container(
+                height: 10,
+              ),
+
+              // Add choice form
+              TextField(
+                controller: _choiceController,
+                onChanged: (s) => setState(() {}),
+                onSubmitted: (s) => _addChoice(),
+                decoration: InputDecoration(
+                    hintText: tr("New choice..."),
+                    suffixIcon: IconButton(
+                      icon: Icon(Icons.add),
+                      onPressed: () => _choiceController.text.length > 0
+                          ? _addChoice()
+                          : null,
+                    )),
+              ),
+            ]),
+      ),
+    );
+  }
+
+  Widget _buildCurrentChoices() {
+    if (_choices.length == 0) return Text(tr("No choice yet."));
+
+    return Column(
+      children: _choices
+          .map((f) => ListTile(
+              title: Text(f),
+              dense: true,
+              trailing: IconButton(
+                icon: Icon(Icons.delete),
+                iconSize: 15,
+                onPressed: () => setState(() => _choices.remove(f)),
+              )))
+          .toList(),
+    );
+  }
+
+  void _addChoice() {
+    if (_choiceController.text.length == 0) return;
+    setState(() {
+      _choices.add(_choiceController.text);
+      _choiceController.text = "";
+    });
+  }
+}