From 18485e23937db46c76c8db028b8a0365832bf722 Mon Sep 17 00:00:00 2001
From: Yao <chenyao1102@gmail.com>
Date: Fri, 11 May 2018 14:14:03 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8D=20cell=20=E5=9C=A8=E5=85=83?=
 =?UTF-8?q?=E7=B4=A0=E6=9B=B4=E6=96=B0=E5=90=8E=EF=BC=8C=E8=BE=B9=E6=A1=86?=
 =?UTF-8?q?=E4=BC=9A=E4=B8=8D=E6=98=BE=E7=A4=BA=E7=9A=84=E9=97=AE=E9=A2=98?=
 =?UTF-8?q?=20(#236)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 packages/cell-group/index.js | 35 ++++++++++++++++++++++++++++-------
 packages/cell/index.js       |  6 ++++--
 2 files changed, 32 insertions(+), 9 deletions(-)

diff --git a/packages/cell-group/index.js b/packages/cell-group/index.js
index aa146cde..60e610c8 100644
--- a/packages/cell-group/index.js
+++ b/packages/cell-group/index.js
@@ -1,18 +1,39 @@
+let cellUpdateTimeout = 0;
+
 Component({
   relations: {
     '../cell/index': {
       type: 'child',
-      linked() {}
+      linked() {
+        this._updateIsLastCell();
+      },
+      linkChanged() {
+        this._updateIsLastCell();
+      },
+      unlinked() {
+        this._updateIsLastCell();
+      }
     }
   },
-  ready() {
-    let cells = this.getRelationNodes('../cell/index');
 
-    if (cells.length > 0) {
-      let lastIndex = cells.length - 1;
+  methods: {
+    _updateIsLastCell() {
+      // 用 setTimeout 减少计算次数
+      if (cellUpdateTimeout > 0) {
+        return;
+      }
 
-      cells.forEach((cell, index) => {
-        if (index < lastIndex) cell.notLastCell();
+      cellUpdateTimeout = setTimeout(() => {
+        cellUpdateTimeout = 0;
+        let cells = this.getRelationNodes('../cell/index');
+
+        if (cells.length > 0) {
+          let lastIndex = cells.length - 1;
+
+          cells.forEach((cell, index) => {
+            cell.updateIsLastCell(index === lastIndex);
+          });
+        }
       });
     }
   }
diff --git a/packages/cell/index.js b/packages/cell/index.js
index 5c5a055c..aab4267f 100644
--- a/packages/cell/index.js
+++ b/packages/cell/index.js
@@ -72,8 +72,10 @@ Component({
         this.navigateTo();
       }
     },
-    notLastCell() {
-      this.setData({ isLastCell: false });
+
+    // 用于被 cell-group 更新，标志是否是最后一个 cell
+    updateIsLastCell(isLastCell) {
+      this.setData({ isLastCell });
     }
   }
 });