fix(android): relayout waterfall when scroll idle and back top

Tencent · Oct 13, 2024 · 129dce4 · 129dce4
1 parent fa1420b
commit 129dce4
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Showing 2 changed files with 34 additions and 3 deletions.
diff --git a/...native/android/src/main/java/com/tencent/mtt/hippy/views/hippylist/HippyRecyclerView.java b/...native/android/src/main/java/com/tencent/mtt/hippy/views/hippylist/HippyRecyclerView.java
@@ -20,6 +20,7 @@
 
 import android.content.Context;
 import android.graphics.Rect;
+import android.util.Log;
 import android.view.ViewConfiguration;
 import android.widget.FrameLayout;
 import androidx.annotation.NonNull;
@@ -49,6 +50,7 @@
 public class HippyRecyclerView<ADP extends HippyRecyclerListAdapter> extends HippyRecyclerViewBase
         implements IHeaderAttachListener, HippyViewHolderAbandonListener, HippyNestedScrollTarget2 {
 
+    private static final String TAG = "HippyRecyclerView";
     private static int DEFAULT_ITEM_VIEW_CACHE_SIZE = 4;
     private static final int INVALID_POINTER = -1;
     protected ADP listAdapter;
@@ -253,18 +255,27 @@ private void scrollToInitContentOffset() {
      * 刷新数据
      */
     public void setListData() {
-        LogUtils.d("HippyRecyclerView", "itemCount =" + listAdapter.getItemCount());
         LayoutManager layoutManager = getLayoutManager();
+        int currentNodeCount = listAdapter.getRenderNodeCount();
         if (layoutManager instanceof StaggeredGridLayoutManager) {
-            listAdapter.notifyItemRangeChanged(renderNodeCount, listAdapter.getRenderNodeCount() - renderNodeCount);
+            LogUtils.d(TAG, "setListData: lastNodeCount " + renderNodeCount + ", currentNodeCount " + currentNodeCount);
+            int[] firstVisibleItem = null;
+            firstVisibleItem = ((HippyStaggeredGridLayoutManager) layoutManager).findFirstVisibleItemPositions(firstVisibleItem);
+            if (renderNodeCount >= currentNodeCount && firstVisibleItem != null
+                    && (firstVisibleItem[0] == 0 || firstVisibleItem[0] == 1)) {
+                LogUtils.d(TAG, "setListData: firstVisibleItem[0] " + firstVisibleItem[0]);
+                listAdapter.notifyDataSetChanged();
+            } else if (renderNodeCount < currentNodeCount) {
+                listAdapter.notifyItemRangeInserted(renderNodeCount, listAdapter.getRenderNodeCount() - renderNodeCount);
+            }
         } else {
             listAdapter.notifyDataSetChanged();
         }
         if (overPullHelper != null) {
             overPullHelper.enableOverPullUp(!listAdapter.hasFooter());
             overPullHelper.enableOverPullDown(!listAdapter.hasHeader());
         }
-        renderNodeCount = listAdapter.getRenderNodeCount();
+        renderNodeCount = currentNodeCount;
         if (renderNodeCount > 0 && mInitialContentOffset > 0) {
             scrollToInitContentOffset();
         }

diff --git a/.../android/src/main/java/com/tencent/mtt/hippy/views/hippylist/RecyclerViewEventHelper.java b/.../android/src/main/java/com/tencent/mtt/hippy/views/hippylist/RecyclerViewEventHelper.java
@@ -28,6 +28,7 @@
 import androidx.recyclerview.widget.HippyStaggeredGridLayoutManager;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView.Adapter;
 import androidx.recyclerview.widget.RecyclerView.LayoutManager;
 import androidx.recyclerview.widget.RecyclerView.OnScrollListener;
 
@@ -56,6 +57,7 @@
 public class RecyclerViewEventHelper extends OnScrollListener implements OnLayoutChangeListener,
         OnAttachStateChangeListener, HippyOverPullListener {
 
+    private static final int WATERFALL_SCROLL_RELAYOUT_THRESHOLD = 4;
     protected final HippyRecyclerView hippyRecyclerView;
     private boolean scrollBeginDragEventEnable;
     private boolean scrollEndDragEventEnable;
@@ -179,6 +181,21 @@ protected HippyViewEvent getOnScrollDragEndedEvent() {
         return onScrollDragEndedEvent;
     }
 
+    private void relayoutWaterfallIfNeeded() {
+        LayoutManager layoutManager = hippyRecyclerView.getLayoutManager();
+        if (layoutManager instanceof HippyStaggeredGridLayoutManager) {
+            int[] firstVisibleItem = null;
+            firstVisibleItem = ((HippyStaggeredGridLayoutManager) layoutManager).findFirstVisibleItemPositions(firstVisibleItem);
+            if (firstVisibleItem != null && (firstVisibleItem[0] <= WATERFALL_SCROLL_RELAYOUT_THRESHOLD)) {
+                Adapter adapter = hippyRecyclerView.getAdapter();
+                if (adapter != null) {
+                    adapter.notifyDataSetChanged();
+                    hippyRecyclerView.dispatchLayout();
+                }
+            }
+        }
+    }
+
     @Override
     public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
         int oldState = currentState;
@@ -190,6 +207,9 @@ public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
         sendDragEndEvent(oldState, currentState);
         sendFlingEvent(newState);
         sendFlingEndEvent(oldState, currentState);
+        if (newState == RecyclerView.SCROLL_STATE_IDLE) {
+            relayoutWaterfallIfNeeded();
+        }
     }
 
     @Override