Introduce ExpandableItemIndicator widget

example/src/main/java/com/h6ah4i/android/example/advrecyclerview/common/widget/ExpandableItemIndicator.java

@@ -0,0 +1,73 @@
+/*
+ *    Copyright (C) 2015 Haruki Hasegawa
+ *
+ *    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.
+ */
+
+package com.h6ah4i.android.example.advrecyclerview.common.widget;
+
+import android.content.Context;
+import android.os.Build;
+import android.os.Parcelable;
+import android.util.AttributeSet;
+import android.util.SparseArray;
+import android.widget.FrameLayout;
+
+public class ExpandableItemIndicator extends FrameLayout {
+    static abstract class Impl {
+        public abstract void onInit(Context context, AttributeSet attrs, int defStyleAttr, ExpandableItemIndicator thiz);
+
+        public abstract void setExpandedState(boolean isExpanded, boolean animate);
+    }
+
+    private Impl mImpl;
+
+    public ExpandableItemIndicator(Context context) {
+        super(context);
+        onInit(context, null, 0);
+    }
+
+    public ExpandableItemIndicator(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        onInit(context, attrs, 0);
+    }
+
+    public ExpandableItemIndicator(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        onInit(context, attrs, defStyleAttr);
+    }
+
+    protected void onInit(Context context, AttributeSet attrs, int defStyleAttr) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
+            // NOTE: MorphButton only supports API level 14 or later
+            mImpl = new ExpandableItemIndicatorImplAnim();
+        } else {
+            mImpl = new ExpandableItemIndicatorImplNoAnim();
+        }
+        mImpl.onInit(context, attrs, defStyleAttr, this);
+    }
+
+    @Override
+    protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) {
+        super.dispatchFreezeSelfOnly(container);
+    }
+
+    @Override
+    protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) {
+        super.dispatchThawSelfOnly(container);
+    }
+
+    public void setExpandedState(boolean isExpanded, boolean animate) {
+        mImpl.setExpandedState(isExpanded, animate);
+    }
+}

example/src/main/java/com/h6ah4i/android/example/advrecyclerview/common/widget/ExpandableItemIndicatorImplAnim.java

@@ -0,0 +1,50 @@
+/*
+ *    Copyright (C) 2015 Haruki Hasegawa
+ *
+ *    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.
+ */
+
+package com.h6ah4i.android.example.advrecyclerview.common.widget;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.os.Build;
+import android.os.Parcelable;
+import android.util.AttributeSet;
+import android.util.SparseArray;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.FrameLayout;
+
+import com.h6ah4i.android.example.advrecyclerview.R;
+import com.wnafee.vector.MorphButton;
+
+@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
+class ExpandableItemIndicatorImplAnim extends ExpandableItemIndicator.Impl {
+    private MorphButton mMorphButton;
+
+    @Override
+    public void onInit(Context context, AttributeSet attrs, int defStyleAttr, ExpandableItemIndicator thiz) {
+        View v = LayoutInflater.from(context).inflate(R.layout.widget_expandable_item_indicator_anim, thiz, true);
+        mMorphButton = (MorphButton) v.findViewById(R.id.morph_button);
+    }
+
+    @Override
+    public void setExpandedState(boolean isExpanded, boolean animate) {
+        MorphButton.MorphState indicatorState = (isExpanded) ? MorphButton.MorphState.END : MorphButton.MorphState.START;
+
+        if (mMorphButton.getState() != indicatorState) {
+            mMorphButton.setState(indicatorState, animate);
+        }
+    }
+}

example/src/main/java/com/h6ah4i/android/example/advrecyclerview/common/widget/ExpandableItemIndicatorImplNoAnim.java

@@ -0,0 +1,41 @@
+/*
+ *    Copyright (C) 2015 Haruki Hasegawa
+ *
+ *    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.
+ */
+
+package com.h6ah4i.android.example.advrecyclerview.common.widget;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.ImageView;
+
+import com.h6ah4i.android.example.advrecyclerview.R;
+
+class ExpandableItemIndicatorImplNoAnim extends ExpandableItemIndicator.Impl {
+    private ImageView mImageView;
+
+    @Override
+    public void onInit(Context context, AttributeSet attrs, int defStyleAttr, ExpandableItemIndicator thiz) {
+        View v = LayoutInflater.from(context).inflate(R.layout.widget_expandable_item_indicator_no_anim, thiz, true);
+        mImageView = (ImageView) v.findViewById(R.id.image_view);
+    }
+
+    @Override
+    public void setExpandedState(boolean isExpanded, boolean animate) {
+        int resId = (isExpanded) ? R.drawable.ic_expand_less : R.drawable.ic_expand_more;
+        mImageView.setImageResource(resId);
+    }
+}

example/src/main/java/com/h6ah4i/android/example/advrecyclerview/demo_e/MyExpandableItemAdapter.java

@@ -16,21 +16,18 @@
 
 package com.h6ah4i.android.example.advrecyclerview.demo_e;
 
-import android.support.v4.view.ViewCompat;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.FrameLayout;
 import android.widget.TextView;
 
 import com.h6ah4i.android.example.advrecyclerview.R;
-import com.h6ah4i.android.example.advrecyclerview.common.compat.MorphButtonCompat;
 import com.h6ah4i.android.example.advrecyclerview.common.data.AbstractExpandableDataProvider;
-import com.h6ah4i.android.example.advrecyclerview.common.utils.ViewUtils;
+import com.h6ah4i.android.example.advrecyclerview.common.widget.ExpandableItemIndicator;
 import com.h6ah4i.android.widget.advrecyclerview.expandable.RecyclerViewExpandableItemManager;
 import com.h6ah4i.android.widget.advrecyclerview.utils.AbstractExpandableItemAdapter;
 import com.h6ah4i.android.widget.advrecyclerview.utils.AbstractExpandableItemViewHolder;
-import com.wnafee.vector.MorphButton;
 
 public class MyExpandableItemAdapter
         extends AbstractExpandableItemAdapter<MyExpandableItemAdapter.MyGroupViewHolder, MyExpandableItemAdapter.MyChildViewHolder> {
@@ -50,11 +47,11 @@ public MyBaseViewHolder(View v) {
     }
 
     public static class MyGroupViewHolder extends MyBaseViewHolder {
-        public MorphButtonCompat mMorphButton;
+        public ExpandableItemIndicator mIndicator;
 
         public MyGroupViewHolder(View v) {
             super(v);
-            mMorphButton = new MorphButtonCompat(v.findViewById(R.id.indicator));
+            mIndicator = (ExpandableItemIndicator) v.findViewById(R.id.indicator);
         }
     }
 
@@ -132,21 +129,18 @@ public void onBindGroupViewHolder(MyGroupViewHolder holder, int groupPosition, i
 
         if ((expandState & RecyclerViewExpandableItemManager.STATE_FLAG_IS_UPDATED) != 0) {
             int bgResId;
-            MorphButton.MorphState indicatorState;
+            boolean isExpanded;
 
             if ((expandState & RecyclerViewExpandableItemManager.STATE_FLAG_IS_EXPANDED) != 0) {
                 bgResId = R.drawable.bg_group_item_expanded_state;
-                indicatorState = MorphButton.MorphState.END;
+                isExpanded = true;
             } else {
                 bgResId = R.drawable.bg_group_item_normal_state;
-                indicatorState = MorphButton.MorphState.START;
+                isExpanded = false;
             }
 
             holder.mContainer.setBackgroundResource(bgResId);
-
-            if (holder.mMorphButton.getState() != indicatorState) {
-                holder.mMorphButton.setState(indicatorState, true);
-            }
+            holder.mIndicator.setExpandedState(isExpanded, true);
         }
     }