Can create weblink posts

lib/ui/dialogs/url_dialog.dart

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+import 'package:comunic/utils/input_utils.dart';
+import 'package:comunic/utils/intl_utils.dart';
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+
+/// Ask the user to enter an URL
+///
+/// @author Pierre Hubert
+
+/// Ask the user to enter an URL
+Future<String> showInputURLDialog({
+  @required BuildContext context,
+  @required String title,
+  String initialURL,
+}) async {
+  return await showDialog(
+    context: context,
+    builder: (c) => _InputURLDialog(
+      title: title,
+      initialURL: initialURL,
+    ),
+  );
+}
+
+class _InputURLDialog extends StatefulWidget {
+  final String title;
+  final String initialURL;
+
+  const _InputURLDialog({
+    Key key,
+    @required this.title,
+    @required this.initialURL,
+  })  : assert(title != null),
+        super(key: key);
+
+  @override
+  __InputURLDialogState createState() => __InputURLDialogState();
+}
+
+class __InputURLDialogState extends State<_InputURLDialog> {
+  TextEditingController _controller;
+
+  bool get _isValid =>
+      _controller.text.isNotEmpty && validateUrl(_controller.text);
+
+  @override
+  void initState() {
+    super.initState();
+    _controller = new TextEditingController(text: widget.initialURL);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return AlertDialog(
+      title: Text(widget.title),
+      content: TextField(
+        controller: _controller,
+        onChanged: (s) => setState(() {}),
+        decoration: InputDecoration(
+          icon: Icon(Icons.link),
+          alignLabelWithHint: true,
+          labelText: "http://...",
+          errorText: _controller.text.isNotEmpty && !_isValid
+              ? tr("Invalid URL!")
+              : null,
+        ),
+      ),
+      actions: <Widget>[
+        // Cancel
+        MaterialButton(
+          child: Text(tr("Cancel").toUpperCase()),
+          onPressed: () => Navigator.of(context).pop(),
+          textColor: Colors.red,
+        ),
+
+        // Confirm
+        MaterialButton(
+          child: Text(tr("Confirm").toUpperCase()),
+          onPressed: _isValid
+              ? () => Navigator.of(context).pop(_controller.text)
+              : null,
+        ),
+      ],
+    );
+  }
+}