feat:add nested slider for complex nested situation

src/widget/flowlayout.ts

@@ -69,12 +69,9 @@ export class FlowLayout extends Superview implements IFlowLayout {
         this.itemCount = 0
     }
     private getItem(itemIdx: number) {
-        let view = this.cachedViews.get(`${itemIdx}`)
-        if (view === undefined) {
-            view = this.renderItem(itemIdx)
+        let view = this.renderItem(itemIdx)
         view.superview = this
         this.cachedViews.set(`${itemIdx}`, view)
-        }
         return view
     }
 

src/widget/index.widget.ts

@@ -22,3 +22,4 @@ export * from './scroller'
 export * from './refreshable'
 export * from './flowlayout'
 export * from './input'
+export * from './nestedSlider'

src/widget/nestedSlider.ts

@@ -0,0 +1,35 @@
+/*
+ * Copyright [2019] [Doric.Pub]
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { Group, View, Property } from '../ui/view'
+import { BridgeContext } from '../runtime/global'
+
+
+export class NestedSlider extends Group {
+    @Property
+    onPageSlided?: (index: number) => void
+
+    addSlideItem(view: View) {
+        this.addChild(view)
+    }
+
+    slidePage(context: BridgeContext, page: number, smooth = false) {
+        return this.nativeChannel(context, "slidePage")({ page, smooth })
+    }
+
+    getSlidedPage(context: BridgeContext) {
+        return this.nativeChannel(context, "getSlidedPage")() as Promise<number>
+    }
+}