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 android.app.Activity;
20import android.graphics.Canvas;
21import android.os.Bundle;
22import android.view.LayoutInflater;
23import android.view.View;
24import android.view.ViewGroup;
25import android.widget.Button;
26import android.widget.TextView;
27
28import androidx.annotation.NonNull;
29import androidx.annotation.Nullable;
30import androidx.cardview.widget.CardView;
31import androidx.recyclerview.widget.ItemTouchHelper;
32import androidx.recyclerview.widget.LinearLayoutManager;
33import androidx.recyclerview.widget.RecyclerView;
34
35import com.example.android.supportv7.Cheeses;
36import com.example.android.supportv7.R;
37import com.example.android.supportv7.widget.util.ConfigToggle;
38import com.example.android.supportv7.widget.util.ConfigViewHolder;
39
40import java.util.ArrayList;
41import java.util.Arrays;
42import java.util.List;
43
44/**
45 * Sample activity from which ItemTouchHelper demo activities inherit.
46 */
47abstract public class ItemTouchHelperActivity extends Activity {
48
49    public RecyclerView mRecyclerView;
50
51    public ItemTouchAdapter mAdapter;
52
53    public ItemTouchHelper mItemTouchHelper;
54
55    public ItemTouchHelper.Callback mCallback;
56
57    private ConfigToggle[] mConfigToggles;
58
59    @Override
60    public void onCreate(Bundle savedInstanceState) {
61        super.onCreate(savedInstanceState);
62        setContentView(R.layout.activity_item_touch);
63        mRecyclerView = findViewById(R.id.recycler_view);
64        mRecyclerView.setHasFixedSize(true);
65        mAdapter = createAdapter();
66        mRecyclerView.setAdapter(mAdapter);
67        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
68        mItemTouchHelper = createItemTouchHelper();
69        mItemTouchHelper.attachToRecyclerView(mRecyclerView);
70        initToggles();
71    }
72
73    private void initToggles() {
74        mConfigToggles = createConfigToggles();
75        RecyclerView configView = findViewById(R.id.config_recycler_view);
76        configView.setAdapter(new RecyclerView.Adapter<ConfigViewHolder>() {
77            @Override
78            public ConfigViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
79                return new ConfigViewHolder(LayoutInflater.from(parent.getContext())
80                        .inflate(R.layout.config_view_toggle, parent, false));
81            }
82
83            @Override
84            public void onBindViewHolder(ConfigViewHolder holder, int position) {
85                ConfigToggle toggle = mConfigToggles[position];
86                holder.bind(toggle);
87            }
88
89            @Override
90            public int getItemCount() {
91                return mConfigToggles.length;
92            }
93        });
94        configView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL,
95                false));
96        configView.setHasFixedSize(true);
97    }
98
99    abstract ConfigToggle[] createConfigToggles();
100
101    public ItemTouchHelper createItemTouchHelper() {
102        mCallback = createCallback();
103        return new ItemTouchHelper(mCallback);
104    }
105
106    public ItemTouchHelper.Callback createCallback() {
107        return new ItemTouchHelper.Callback() {
108            @Override
109            public int getMovementFlags(@NonNull RecyclerView recyclerView,
110                    @NonNull RecyclerView.ViewHolder viewHolder) {
111                return ItemTouchHelperActivity.this.getMovementFlags(recyclerView, viewHolder);
112            }
113
114            @Override
115            public boolean onMove(@NonNull RecyclerView recyclerView,
116                    @NonNull RecyclerView.ViewHolder viewHolder,
117                    @NonNull RecyclerView.ViewHolder target) {
118                mAdapter.move(viewHolder.getAdapterPosition(), target.getAdapterPosition());
119                return true;
120            }
121
122            @Override
123            public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
124                mAdapter.delete(viewHolder.getAdapterPosition());
125            }
126
127            @Override
128            public void onSelectedChanged(@Nullable RecyclerView.ViewHolder viewHolder,
129                    int actionState) {
130                super.onSelectedChanged(viewHolder, actionState);
131                ItemTouchHelperActivity.this.onSelectedChanged(viewHolder, actionState);
132            }
133
134            @Override
135            public void onChildDraw(@NonNull Canvas c, @NonNull RecyclerView recyclerView,
136                    @NonNull RecyclerView.ViewHolder viewHolder,
137                    float dX, float dY, int actionState, boolean isCurrentlyActive) {
138                if (ItemTouchHelperActivity.this.onChildDraw(c, recyclerView, viewHolder,
139                        dX, dY, actionState, isCurrentlyActive)) {
140                    return;
141                }
142                super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState,
143                        isCurrentlyActive);
144            }
145
146            @Override
147            public void onChildDrawOver(@NonNull Canvas c, @NonNull RecyclerView recyclerView,
148                    RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState,
149                    boolean isCurrentlyActive) {
150                if (ItemTouchHelperActivity.this.onChildDrawOver(c, recyclerView, viewHolder,
151                        dX, dY, actionState, isCurrentlyActive)) {
152                    return;
153                }
154                super.onChildDrawOver(c, recyclerView, viewHolder, dX, dY, actionState,
155                        isCurrentlyActive);
156            }
157
158            @Override
159            public boolean isLongPressDragEnabled() {
160                return ItemTouchHelperActivity.this.isLongPressDragEnabled();
161            }
162
163            @Override
164            public boolean isItemViewSwipeEnabled() {
165                return ItemTouchHelperActivity.this.isPointerSwipeEnabled();
166            }
167
168            @Override
169            public void clearView(@NonNull RecyclerView recyclerView,
170                    @NonNull RecyclerView.ViewHolder viewHolder) {
171                super.clearView(recyclerView, viewHolder);
172                ItemTouchHelperActivity.this.clearView(viewHolder);
173            }
174        };
175    }
176
177    /**
178     * @return True if we should NOT call parent
179     */
180    public boolean onChildDraw(Canvas c, RecyclerView recyclerView,
181            RecyclerView.ViewHolder viewHolder,
182            float dX, float dY, int actionState, boolean isCurrentlyActive) {
183        return false;
184    }
185
186    /**
187     * @return True if we should NOT call parent
188     */
189    public boolean onChildDrawOver(Canvas c, RecyclerView recyclerView,
190            RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState,
191            boolean isCurrentlyActive) {
192        return false;
193    }
194
195    public void clearView(RecyclerView.ViewHolder viewHolder) {
196
197    }
198
199    public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
200
201    }
202
203    public boolean isLongPressDragEnabled() {
204        return true;
205    }
206
207    public boolean isPointerSwipeEnabled() {
208        return true;
209    }
210
211    public ItemTouchViewHolder onCreateViewHolder(ViewGroup parent) {
212        return new ItemTouchViewHolder(
213                LayoutInflater.from(parent.getContext())
214                        .inflate(R.layout.touch_item, parent, false));
215    }
216
217    abstract public int getMovementFlags(RecyclerView recyclerView,
218            RecyclerView.ViewHolder viewHolder);
219
220    public ItemTouchAdapter createAdapter() {
221        return new ItemTouchAdapter();
222    }
223
224    public void onBind(ItemTouchViewHolder viewHolder) {
225
226    }
227
228    public void onCreateViewHolder(ItemTouchViewHolder viewHolder) {
229
230    }
231
232    public class ItemTouchViewHolder extends RecyclerView.ViewHolder {
233
234        public final TextView textView;
235
236        public final Button actionButton;
237
238        public final CardView cardView;
239
240        public final View overlay;
241
242        public ItemTouchViewHolder(View itemView) {
243            super(itemView);
244            cardView = (CardView) itemView;
245            textView = (TextView) itemView.findViewById(R.id.text_view);
246            actionButton = (Button) itemView.findViewById(R.id.action_button);
247            overlay = itemView.findViewById(R.id.overlay);
248        }
249    }
250
251    public class ItemTouchAdapter extends RecyclerView.Adapter<ItemTouchViewHolder> {
252
253        private List<String> mItems = new ArrayList<String>();
254
255        public ItemTouchAdapter() {
256            mItems.addAll(Arrays.asList(Cheeses.sCheeseStrings));
257        }
258
259        @Override
260        public ItemTouchViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
261            return ItemTouchHelperActivity.this.onCreateViewHolder(parent);
262        }
263
264        @Override
265        public void onBindViewHolder(ItemTouchViewHolder holder, int position) {
266            holder.textView.setText(mItems.get(position));
267            onBind(holder);
268        }
269
270        public void delete(int position) {
271            mItems.remove(position);
272            notifyItemRemoved(position);
273        }
274
275        public void move(int from, int to) {
276            String prev = mItems.remove(from);
277            mItems.add(to > from ? to - 1 : to, prev);
278            notifyItemMoved(from, to);
279        }
280
281        @Override
282        public int getItemCount() {
283            return mItems.size();
284        }
285    }
286
287
288}
289