Can change conversation color

lib/ui/dialogs/color_picker_dialog.dart

@@ -0,0 +1,54 @@
+import 'package:comunic/utils/intl_utils.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_colorpicker/flutter_colorpicker.dart';
+
+/// Color picker dialog
+///
+/// @author Pierre Hubert
+
+Future<Color> showColorPickerDialog(
+        BuildContext context, Color initialColor) async =>
+    await showDialog(
+      context: context,
+      builder: (c) => _ColorPickerDialog(initialColor: initialColor),
+    );
+
+class _ColorPickerDialog extends StatefulWidget {
+  final Color initialColor;
+
+  const _ColorPickerDialog({Key key, @required this.initialColor})
+      : super(key: key);
+
+  @override
+  __ColorPickerDialogState createState() => __ColorPickerDialogState();
+}
+
+class __ColorPickerDialogState extends State<_ColorPickerDialog> {
+  Color _newColor;
+
+  @override
+  void initState() {
+    _newColor = widget.initialColor;
+    super.initState();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return AlertDialog(
+      content: MaterialPicker(
+        pickerColor: _newColor ?? Colors.blue.shade900,
+        onColorChanged: (c) => setState(() => _newColor = c),
+      ),
+      actions: [
+        MaterialButton(
+          onPressed: () => Navigator.pop(context, widget.initialColor),
+          child: Text(tr("Cancel").toUpperCase()),
+        ),
+        MaterialButton(
+          onPressed: () => Navigator.pop(context, _newColor),
+          child: Text(tr("Ok").toUpperCase()),
+        ),
+      ],
+    );
+  }
+}