1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.example.android.supportv7.widget.touch;
18
19import com.example.android.supportv7.Cheeses;
20import com.example.android.supportv7.R;
21import com.example.android.supportv7.widget.util.ConfigToggle;
22import com.example.android.supportv7.widget.util.ConfigViewHolder;
23
24import android.app.Activity;
25import android.graphics.Canvas;
26import android.os.Bundle;
27import android.support.v7.widget.CardView;
28import android.support.v7.widget.LinearLayoutManager;
29import android.support.v7.widget.RecyclerView;
30import android.support.v7.widget.helper.ItemTouchHelper;
31import android.view.LayoutInflater;
32import android.view.View;
33import android.view.ViewGroup;
34import android.widget.Button;
35import android.widget.TextView;
36
37import java.util.ArrayList;
38import java.util.Arrays;
39import java.util.List;
40
41/**
42 * Sample activity from which ItemTouchHelper demo activities inherit.
43 */
44abstract public class ItemTouchHelperActivity extends Activity {
45
46    public RecyclerView mRecyclerView;
47
48    public ItemTouchAdapter mAdapter;
49
50    public ItemTouchHelper mItemTouchHelper;
51
52    public ItemTouchHelper.Callback mCallback;
53
54    private ConfigToggle[] mConfigToggles;
55
56    @Override
57    public void onCreate(Bundle savedInstanceState) {
58        super.onCreate(savedInstanceState);
59        setContentView(R.layout.activity_item_touch);
60        mRecyclerView = findViewById(R.id.recycler_view);
61        mRecyclerView.setHasFixedSize(true);
62        mAdapter = createAdapter();
63        mRecyclerView.setAdapter(mAdapter);
64        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
65        mItemTouchHelper = createItemTouchHelper();
66        mItemTouchHelper.attachToRecyclerView(mRecyclerView);
67        initToggles();
68    }
69
70    private void initToggles() {
71        mConfigToggles = createConfigToggles();
72        RecyclerView configView = findViewById(R.id.config_recycler_view);
73        configView.setAdapter(new RecyclerView.Adapter<ConfigViewHolder>() {
74            @Override
75            public ConfigViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
76                return new ConfigViewHolder(LayoutInflater.from(parent.getContext())
77                        .inflate(R.layout.config_view_toggle, parent, false));
78            }
79
80            @Override
81            public void onBindViewHolder(ConfigViewHolder holder, int position) {
82                ConfigToggle toggle = mConfigToggles[position];
83                holder.bind(toggle);
84            }
85
86            @Override
87            public int getItemCount() {
88                return mConfigToggles.length;
89            }
90        });
91        configView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL,
92                false));
93        configView.setHasFixedSize(true);
94    }
95
96    abstract ConfigToggle[] createConfigToggles();
97
98    public ItemTouchHelper createItemTouchHelper() {
99        mCallback = createCallback();
100        return new ItemTouchHelper(mCallback);
101    }
102
103    public ItemTouchHelper.Callback createCallback() {
104        return new ItemTouchHelper.Callback() {
105            @Override
106            public int getMovementFlags(RecyclerView recyclerView,
107                    RecyclerView.ViewHolder viewHolder) {
108                return ItemTouchHelperActivity.this.getMovementFlags(recyclerView, viewHolder);
109            }
110
111            @Override
112            public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder,
113                    RecyclerView.ViewHolder target) {
114                mAdapter.move(viewHolder.getAdapterPosition(), target.getAdapterPosition());
115                return true;
116            }
117
118            @Override
119            public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
120                mAdapter.delete(viewHolder.getAdapterPosition());
121            }
122
123            @Override
124            public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
125                super.onSelectedChanged(viewHolder, actionState);
126                ItemTouchHelperActivity.this.onSelectedChanged(viewHolder, actionState);
127            }
128
129            @Override
130            public void onChildDraw(Canvas c, RecyclerView recyclerView,
131                    RecyclerView.ViewHolder viewHolder,
132                    float dX, float dY, int actionState, boolean isCurrentlyActive) {
133                if (ItemTouchHelperActivity.this.onChildDraw(c, recyclerView, viewHolder,
134                        dX, dY, actionState, isCurrentlyActive)) {
135                    return;
136                }
137                super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState,
138                        isCurrentlyActive);
139            }
140
141            @Override
142            public void onChildDrawOver(Canvas c, RecyclerView recyclerView,
143                    RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState,
144                    boolean isCurrentlyActive) {
145                if (ItemTouchHelperActivity.this.onChildDrawOver(c, recyclerView, viewHolder,
146                        dX, dY, actionState, isCurrentlyActive)) {
147                    return;
148                }
149                super.onChildDrawOver(c, recyclerView, viewHolder, dX, dY, actionState,
150                        isCurrentlyActive);
151            }
152
153            @Override
154            public boolean isLongPressDragEnabled() {
155                return ItemTouchHelperActivity.this.isLongPressDragEnabled();
156            }
157
158            @Override
159            public boolean isItemViewSwipeEnabled() {
160                return ItemTouchHelperActivity.this.isPointerSwipeEnabled();
161            }
162
163            @Override
164            public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
165                super.clearView(recyclerView, viewHolder);
166                ItemTouchHelperActivity.this.clearView(viewHolder);
167            }
168        };
169    }
170
171    /**
172     * @return True if we should NOT call parent
173     */
174    public boolean onChildDraw(Canvas c, RecyclerView recyclerView,
175            RecyclerView.ViewHolder viewHolder,
176            float dX, float dY, int actionState, boolean isCurrentlyActive) {
177        return false;
178    }
179
180    /**
181     * @return True if we should NOT call parent
182     */
183    public boolean onChildDrawOver(Canvas c, RecyclerView recyclerView,
184            RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState,
185            boolean isCurrentlyActive) {
186        return false;
187    }
188
189    public void clearView(RecyclerView.ViewHolder viewHolder) {
190
191    }
192
193    public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
194
195    }
196
197    public boolean isLongPressDragEnabled() {
198        return true;
199    }
200
201    public boolean isPointerSwipeEnabled() {
202        return true;
203    }
204
205    public ItemTouchViewHolder onCreateViewHolder(ViewGroup parent) {
206        ItemTouchViewHolder itemTouchViewHolder = new ItemTouchViewHolder(
207                LayoutInflater.from(parent.getContext())
208                        .inflate(R.layout.touch_item, parent, false));
209        return itemTouchViewHolder;
210    }
211
212    abstract public int getMovementFlags(RecyclerView recyclerView,
213            RecyclerView.ViewHolder viewHolder);
214
215    public ItemTouchAdapter createAdapter() {
216        return new ItemTouchAdapter();
217    }
218
219    public void onBind(ItemTouchViewHolder viewHolder) {
220
221    }
222
223    public void onCreateViewHolder(ItemTouchViewHolder viewHolder) {
224
225    }
226
227    public class ItemTouchViewHolder extends RecyclerView.ViewHolder {
228
229        public final TextView textView;
230
231        public final Button actionButton;
232
233        public final CardView cardView;
234
235        public final View overlay;
236
237        public ItemTouchViewHolder(View itemView) {
238            super(itemView);
239            cardView = (CardView) itemView;
240            textView = (TextView) itemView.findViewById(R.id.text_view);
241            actionButton = (Button) itemView.findViewById(R.id.action_button);
242            overlay = itemView.findViewById(R.id.overlay);
243        }
244    }
245
246    public class ItemTouchAdapter extends RecyclerView.Adapter<ItemTouchViewHolder> {
247
248        private List<String> mItems = new ArrayList<String>();
249
250        public ItemTouchAdapter() {
251            mItems.addAll(Arrays.asList(Cheeses.sCheeseStrings));
252        }
253
254        @Override
255        public ItemTouchViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
256            return ItemTouchHelperActivity.this.onCreateViewHolder(parent);
257        }
258
259        @Override
260        public void onBindViewHolder(ItemTouchViewHolder holder, int position) {
261            holder.textView.setText(mItems.get(position));
262            onBind(holder);
263        }
264
265        public void delete(int position) {
266            mItems.remove(position);
267            notifyItemRemoved(position);
268        }
269
270        public void move(int from, int to) {
271            String prev = mItems.remove(from);
272            mItems.add(to > from ? to - 1 : to, prev);
273            notifyItemMoved(from, to);
274        }
275
276        @Override
277        public int getItemCount() {
278            return mItems.size();
279        }
280    }
281
282
283}
284