remove data by card

tangram/src/main/java/com/tmall/wireless/tangram/TangramEngine.java

@@ -28,6 +28,7 @@ import android.content.Context;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.v7.widget.RecyclerView;
+import android.text.Html;
 import android.text.TextUtils;
 import android.util.Pair;
 import android.view.View;
@@ -601,7 +602,34 @@ public class TangramEngine extends BaseTangramEngine<JSONArray, Card, BaseCell>
      * @param group
      */
     public void removeComponents(Card group) {
-
+        VirtualLayoutManager layoutManager = getLayoutManager();
+        if (group != null && mGroupBasicAdapter != null && layoutManager != null) {
+            int cardIdx = mGroupBasicAdapter.findCardIdxForCard(group);
+            List<LayoutHelper> layoutHelpers = layoutManager.getLayoutHelpers();
+            LayoutHelper emptyLayoutHelper = null;
+            int removeItemCount = 0;
+            if (layoutHelpers != null && cardIdx >= 0 && cardIdx < layoutHelpers.size()) {
+                for (int i = 0, size = layoutHelpers.size(); i < size; i++) {
+                    LayoutHelper layoutHelper = layoutHelpers.get(i);
+                    int start = layoutHelper.getRange().getLower();
+                    int end = layoutHelper.getRange().getUpper();
+                    if (i < cardIdx) {
+                        // do nothing
+                    } else if (i == cardIdx) {
+                        removeItemCount = layoutHelper.getItemCount();
+                        emptyLayoutHelper = layoutHelper;
+                    } else {
+                        layoutHelper.setRange(start - removeItemCount, end - removeItemCount);
+                    }
+                }
+                if (emptyLayoutHelper != null) {
+                    final List<LayoutHelper> newLayoutHelpers = new LinkedList<>(layoutHelpers);
+                    newLayoutHelpers.remove(emptyLayoutHelper);
+                    layoutManager.setLayoutHelpers(newLayoutHelpers, false);
+                }
+                mGroupBasicAdapter.removeComponents(group);
+            }
+        }
     }
 
 }

tangram/src/main/java/com/tmall/wireless/tangram/core/adapter/GroupBasicAdapter.java

@@ -306,7 +306,7 @@ public abstract class GroupBasicAdapter<L, C> extends VirtualLayoutAdapter<Binde
     /**
      *
      * @param card
-     * @return card ragne of given instance
+     * @return card range of given instance
      */
     public Range<Integer> getCardRange(Card card) {
         if (card == null) return Range.create(0, 1);
@@ -319,6 +319,20 @@ public abstract class GroupBasicAdapter<L, C> extends VirtualLayoutAdapter<Binde
         }
     }
 
+    /**
+     *
+     * @param card
+     * @return card index of given instance
+     */
+    public int findCardIdxForCard(L card) {
+        for (int i = 0, size = mCards.size(); i < size; i++) {
+            if (mCards.get(i).second == card) {
+                return i;
+            }
+        }
+        return -1;
+    }
+
     /**
      *
      * @param position cell's adapter position
@@ -536,6 +550,12 @@ public abstract class GroupBasicAdapter<L, C> extends VirtualLayoutAdapter<Binde
      */
     abstract public void removeComponent(C component);
 
+    /**
+     *
+     * @param group a group of components to be removed.
+     */
+    abstract public void removeComponents(L group);
+
     /**
      * Do not call this method directly. It's not designed for users.
      * @param pos

tangram/src/main/java/com/tmall/wireless/tangram/dataparser/concrete/PojoGroupBasicAdapter.java

@@ -418,11 +418,40 @@ public class PojoGroupBasicAdapter extends GroupBasicAdapter<Card, BaseCell> {
                 mCards.clear();
                 mCards.addAll(newCards);
                 mData.remove(component);
-                notifyItemRemoved(removePosition);
+                notifyItemRangeChanged(removePosition, 1);
             }
         }
     }
 
+    @Override
+    public void removeComponents(Card group) {
+        if (group != null && mCards != null) {
+            List<Pair<Range<Integer>, Card>> newCards = new ArrayList<>();
+            int cardIdx = findCardIdxForCard(group);
+            int removeItemCount = 0;
+            int removePosition = 0;
+            for (int i = 0, size = mCards.size(); i < size; i++) {
+                Pair<Range<Integer>, Card> pair = mCards.get(i);
+                int start = pair.first.getLower();
+                int end = pair.first.getUpper();
+                if (i < cardIdx) {
+                    //do nothing
+                    newCards.add(pair);
+                } else if (i == cardIdx) {
+                    removePosition = start;
+                    removeItemCount = end - start;
+                } else {
+                    Pair<Range<Integer>, Card> newPair = new Pair<>(Range.create(start - removeItemCount, end - removeItemCount), pair.second);
+                    newCards.add(newPair);
+                }
+            }
+            mCards.clear();
+            mCards.addAll(newCards);
+            mData.removeAll(group.getCells());
+            notifyItemRangeRemoved(removePosition, removeItemCount);
+        }
+    }
+
     @Override
     public void insertComponents(int pos, List<BaseCell> components) {
         if (mData != null && components != null && !components.isEmpty() && pos > 0) {