From c896bfc64c1f44afdf1ba9973835eb9bb0b2b101 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=8E=8B=E5=8A=B2=E9=B9=8F?= <jingpeng.wang@outlook.com>
Date: Fri, 13 Dec 2019 14:31:47 +0800
Subject: [PATCH] implement android flow layout load more

---
 .../doric/shader/flowlayout/FlowAdapter.java  | 19 ++++++++++++++++++-
 .../shader/flowlayout/FlowLayoutNode.java     | 16 +++++++++++++++-
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/doric/src/main/java/pub/doric/shader/flowlayout/FlowAdapter.java b/doric/src/main/java/pub/doric/shader/flowlayout/FlowAdapter.java
index 00c2f9fa..ea9001e0 100644
--- a/doric/src/main/java/pub/doric/shader/flowlayout/FlowAdapter.java
+++ b/doric/src/main/java/pub/doric/shader/flowlayout/FlowAdapter.java
@@ -22,6 +22,7 @@ import android.view.ViewGroup;
 
 import androidx.annotation.NonNull;
 import androidx.recyclerview.widget.RecyclerView;
+import androidx.recyclerview.widget.StaggeredGridLayoutManager;
 
 import com.github.pengfeizhou.jscore.JSArray;
 import com.github.pengfeizhou.jscore.JSDecoder;
@@ -65,15 +66,28 @@ class FlowAdapter extends RecyclerView.Adapter<FlowAdapter.DoricViewHolder> {
             holder.flowLayoutItemNode.setId(jsObject.getProperty("id").asString().value());
             holder.flowLayoutItemNode.blend(jsObject.getProperty("props").asObject());
         }
+        if (position >= this.itemCount) {
+            this.flowLayoutNode.callJSResponse(this.flowLayoutNode.onLoadMoreFuncId);
+
+            StaggeredGridLayoutManager.LayoutParams layoutParams = new StaggeredGridLayoutManager.LayoutParams(
+                    ViewGroup.LayoutParams.MATCH_PARENT,
+                    holder.itemView.getLayoutParams().height
+            );
+            layoutParams.setFullSpan(true);
+            holder.itemView.setLayoutParams(layoutParams);
+        }
     }
 
     @Override
     public int getItemCount() {
-        return itemCount;
+        return this.itemCount + (this.flowLayoutNode.loadMore ? 1 : 0);
     }
 
     @Override
     public int getItemViewType(int position) {
+        if (position >= itemCount) {
+            return Integer.MAX_VALUE;
+        }
         JSValue value = getItemModel(position);
         if (value.isObject()) {
             if (value.asObject().getProperty("identifier").isString()) {
@@ -84,6 +98,9 @@ class FlowAdapter extends RecyclerView.Adapter<FlowAdapter.DoricViewHolder> {
     }
 
     private JSValue getItemModel(final int position) {
+        if (position >= this.itemCount) {
+            return this.flowLayoutNode.getSubModel(this.flowLayoutNode.loadMoreViewId);
+        }
         String id = itemValues.get(position);
         if (TextUtils.isEmpty(id)) {
             AsyncResult<JSDecoder> asyncResult = flowLayoutNode.callJSResponse(
diff --git a/doric/src/main/java/pub/doric/shader/flowlayout/FlowLayoutNode.java b/doric/src/main/java/pub/doric/shader/flowlayout/FlowLayoutNode.java
index 14e7b94c..c01c543c 100644
--- a/doric/src/main/java/pub/doric/shader/flowlayout/FlowLayoutNode.java
+++ b/doric/src/main/java/pub/doric/shader/flowlayout/FlowLayoutNode.java
@@ -70,6 +70,9 @@ public class FlowLayoutNode extends SuperNode<RecyclerView> {
             outRect.set(columnSpace / 2, rowSpace / 2, columnSpace / 2, rowSpace / 2);
         }
     };
+    String onLoadMoreFuncId;
+    boolean loadMore = false;
+    String loadMoreViewId;
 
     public FlowLayoutNode(DoricContext doricContext) {
         super(doricContext);
@@ -115,13 +118,24 @@ public class FlowLayoutNode extends SuperNode<RecyclerView> {
                 if (!funcId.equals(this.flowAdapter.renderItemFuncId)) {
                     this.flowAdapter.renderItemFuncId = funcId;
                     // If reset renderItem,should reset native cache.
+                    for (int index = 0; index < this.flowAdapter.itemValues.size(); index++) {
+                        removeSubModel(this.flowAdapter.itemValues.valueAt(index));
+                    }
                     this.flowAdapter.itemValues.clear();
-                    clearSubModel();
                 }
                 break;
             case "batchCount":
                 this.flowAdapter.batchCount = prop.asNumber().toInt();
                 break;
+            case "onLoadMore":
+                this.onLoadMoreFuncId = prop.asString().value();
+                break;
+            case "loadMoreView":
+                this.loadMoreViewId = prop.asString().value();
+                break;
+            case "loadMore":
+                this.loadMore = prop.asBoolean().value();
+                break;
             default:
                 super.blend(view, name, prop);
                 break;