fix time display

Author: boyan01

lib/material/images.dart

@@ -32,15 +32,22 @@ class Number extends StatelessWidget {
   ///could be null
   final int number;
 
-  Number({Key key, this.length = 5, @required this.number}) : super(key: key);
+  final bool padWithZero;
+
+  Number(
+      {Key key,
+      this.length = 5,
+      @required this.number,
+      this.padWithZero = false})
+      : super(key: key);
 
   @override
   Widget build(BuildContext context) {
     String digitals = number?.toString() ?? "";
     if (digitals.length > length) {
       digitals = digitals.substring(digitals.length - length);
     }
-    digitals = digitals.padLeft(length);
+    digitals = digitals.padLeft(length, padWithZero ? "0" : " ");
     List<Widget> children = [];
     for (int i = 0; i < length; i++) {
       children.add(Digital(int.tryParse(digitals[i])));

lib/panel/status_panel.dart

@@ -92,9 +92,9 @@ class _GameStatusState extends State<_GameStatus> {
         SizedBox(width: 4),
         IconPause(),
         Spacer(),
-        Number(number: _hour, length: 2),
+        Number(number: _hour, length: 2, padWithZero: true),
         IconColon(enable: _colonEnable),
-        Number(number: _minute, length: 2),
+        Number(number: _minute, length: 2, padWithZero: true),
       ],
     );
   }