增加周切换的监听方法，addWeekChangeListener

lib/configuration.dart

@@ -65,6 +65,8 @@ class CalendarConfiguration {
 
   ObserverList<OnMonthChange> monthChangeListeners =
       ObserverList<OnMonthChange>(); //保存多个月份监听的事件
+  ObserverList<OnWeekChange> weekChangeListeners =
+      ObserverList<OnWeekChange>(); //周视图切换
 
   /**
    * 下面的信息不是配置的，是根据配置信息进行计算出来的

lib/controller.dart

@@ -184,6 +184,11 @@ class CalendarController {
     calendarConfiguration.weekController = weekController;
   }
 
+  //周视图切换
+  void addWeekChangeListener(OnWeekChange listener){
+    this.calendarConfiguration.weekChangeListeners.add(listener);
+  }
+
   //月份切换监听
   void addMonthChangeListener(OnMonthChange listener) {
 //    this.calendarConfiguration.monthChange = listener;
@@ -532,6 +537,11 @@ bool defaultInRange(DateModel dateModel) {
   return true;
 }
 
+/**
+ * 周视图切换
+ */
+typedef void OnWeekChange(int year, int month);
+
 /**
  * 月份切换事件
  */

lib/widget/week_view_pager.dart

@@ -54,13 +54,17 @@ class _WeekViewPagerState extends State<WeekViewPager>
           if (calendarProvider.expandStatus.value == true) {
             return;
           }
+
           LogUtil.log(
               TAG: this.runtimeType,
               message:
                   "WeekViewPager PageView onPageChanged,position:$position");
-//          周视图的变化
           DateModel firstDayOfWeek = configuration.weekList[position];
           int currentMonth = firstDayOfWeek.month;
+//          周视图的变化
+          configuration.weekChangeListeners.forEach((listener) {
+            listener(firstDayOfWeek.year, firstDayOfWeek.month);
+          });
           if (lastMonth != currentMonth) {
             LogUtil.log(
                 TAG: this.runtimeType,