From ef9314e70c1be3c2820ef91479a859f82575b653 Mon Sep 17 00:00:00 2001
From: mxie <15623530290@163.com>
Date: Tue, 30 Oct 2018 11:11:26 +0800
Subject: [PATCH] feat: add `calendar-change` event

---
 src/calendar.vue      | 15 +++++++++------
 src/mixins/emitter.js | 21 +++++++++++++++++++++
 2 files changed, 30 insertions(+), 6 deletions(-)
 create mode 100644 src/mixins/emitter.js

diff --git a/src/calendar.vue b/src/calendar.vue
index 9a65157..fe11ec6 100644
--- a/src/calendar.vue
+++ b/src/calendar.vue
@@ -73,6 +73,7 @@
 <script>
 import { isValidDate, isDateObejct, formatDate } from '@/utils/index'
 import locale from '@/mixins/locale'
+import emitter from '@/mixins/emitter'
 import scrollIntoView from '@/utils/scroll-into-view'
 import PanelDate from '@/panel/date'
 import PanelYear from '@/panel/year'
@@ -82,7 +83,7 @@ import PanelTime from '@/panel/time'
 export default {
   name: 'CalendarPanel',
   components: { PanelDate, PanelYear, PanelMonth, PanelTime },
-  mixins: [locale],
+  mixins: [locale, emitter],
   props: {
     value: {
       default: null,
@@ -203,7 +204,7 @@ export default {
   },
   methods: {
     handelPanelChange (panel, oldPanel) {
-      this.$parent.$emit('panel-change', panel, oldPanel)
+      this.dispatch('DatePicker', 'panel-change', [panel, oldPanel])
       if (panel === 'YEAR') {
         this.firstYear = Math.floor(this.calendarYear / 10) * 10
       } else if (panel === 'TIME') {
@@ -231,11 +232,13 @@ export default {
       } else {
         this.showPanelNone()
       }
-      this.updateNow(this.value)
     },
     // 根据value更新日历
     updateNow (value) {
-      this.now = value ? new Date(value) : new Date()
+      const now = value ? new Date(value) : new Date()
+      const oldNow = new Date(this.now)
+      this.dispatch('DatePicker', 'calendar-change', [now, oldNow])
+      this.now = now
     },
     getCriticalTime (value) {
       if (!value) {
@@ -334,10 +337,10 @@ export default {
       this.$emit('select-time', time, true)
     },
     changeCalendarYear (year) {
-      this.now = new Date(year, this.calendarMonth)
+      this.updateNow(new Date(year, this.calendarMonth))
     },
     changeCalendarMonth (month) {
-      this.now = new Date(this.calendarYear, month)
+      this.updateNow(new Date(this.calendarYear, month))
     },
     getSibling () {
       const calendars = this.$parent.$children.filter(v => v.$options.name === this.$options.name)
diff --git a/src/mixins/emitter.js b/src/mixins/emitter.js
new file mode 100644
index 0000000..98abc21
--- /dev/null
+++ b/src/mixins/emitter.js
@@ -0,0 +1,21 @@
+
+export default {
+  methods: {
+    dispatch (componentName, eventName, params) {
+      let parent = this.$parent || this.$root
+      let name = parent.$options.name
+
+      while (parent && (!name || name !== componentName)) {
+        parent = parent.$parent
+
+        if (parent) {
+          name = parent.$options.name
+        }
+      }
+      if (name && name === componentName) {
+        parent = parent || this
+        parent.$emit.apply(parent, [eventName].concat(params))
+      }
+    }
+  }
+}