1/*
2 * Copyright (C) 2014 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;
18
19import com.example.android.supportv7.Cheeses;
20import com.example.android.supportv7.R;
21import com.example.android.supportv7.widget.adapter.SimpleStringAdapter;
22import com.example.android.supportv7.widget.util.ConfigToggle;
23import com.example.android.supportv7.widget.util.ConfigViewHolder;
24
25import android.app.Activity;
26import android.content.Context;
27import android.os.Bundle;
28import android.support.v7.widget.DefaultItemAnimator;
29import android.support.v7.widget.LinearLayoutManager;
30import android.support.v7.widget.RecyclerView;
31import android.view.LayoutInflater;
32import android.view.View;
33import android.view.ViewGroup;
34import android.widget.BaseAdapter;
35import android.widget.CheckBox;
36import android.widget.CompoundButton;
37import android.widget.EditText;
38import android.widget.Spinner;
39import android.widget.TextView;
40
41/**
42 * A simple activity that can be extended to demonstrate LayoutManagers.
43 * <p>
44 * It initializes a sample adapter and a list of configuration options. Extending activities can
45 * define the {@link ConfigToggle} list depending on its functionality.
46 */
47abstract public class BaseLayoutManagerActivity<T extends RecyclerView.LayoutManager>
48        extends Activity {
49
50    protected T mLayoutManager;
51
52    protected RecyclerView mRecyclerView;
53
54    private ConfigToggle[] mConfigToggles;
55
56    @Override
57    protected void onCreate(Bundle savedInstanceState) {
58        super.onCreate(savedInstanceState);
59        setContentView(R.layout.activity_base_layout_manager);
60        initToggles();
61        initRecyclerView();
62        initSpinner();
63    }
64
65    abstract protected T createLayoutManager();
66
67    private void initRecyclerView() {
68        mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
69        mRecyclerView.setHasFixedSize(true);
70        mLayoutManager = createLayoutManager();
71        mRecyclerView.setLayoutManager(mLayoutManager);
72        mRecyclerView.setAdapter(createAdapter());
73        ((DefaultItemAnimator)mRecyclerView.getItemAnimator()).setSupportsChangeAnimations(true);
74        onRecyclerViewInit(mRecyclerView);
75    }
76
77    protected void onRecyclerViewInit(RecyclerView recyclerView) {
78
79    }
80
81    protected RecyclerView.Adapter createAdapter() {
82        return new SimpleStringAdapter(this, Cheeses.sCheeseStrings) {
83            @Override
84            public SimpleStringAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
85                    int viewType) {
86                final SimpleStringAdapter.ViewHolder vh = super
87                        .onCreateViewHolder(parent, viewType);
88                vh.itemView.setOnClickListener(new View.OnClickListener() {
89                    @Override
90                    public void onClick(View v) {
91                        final int pos = vh.getAdapterPosition();
92                        if (pos != RecyclerView.NO_POSITION && pos + 1 < getItemCount()) {
93                            swap(pos, pos + 1);
94                        }
95                    }
96                });
97                return vh;
98            }
99        };
100    }
101
102    private void initToggles() {
103        mConfigToggles = createConfigToggles();
104        RecyclerView configView = (RecyclerView) findViewById(R.id.config_recycler_view);
105        configView.setAdapter(mConfigAdapter);
106        configView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL,
107                false));
108        configView.setHasFixedSize(true);
109    }
110
111    public void onScrollClicked(View view) {
112        final EditText scrollOffset = (EditText) findViewById(R.id.scroll_offset);
113        final CheckBox checkBox = (CheckBox) findViewById(R.id.enable_smooth_scroll);
114        final Spinner spinner = (Spinner) findViewById(R.id.spinner);
115
116        Integer offset = null;
117        String offsetString = scrollOffset.getText().toString();
118        try {
119            offset = Integer.parseInt(offsetString);
120        } catch (NumberFormatException ex) {
121
122        }
123        final boolean smooth = checkBox.isChecked();
124        if (offset == null) {
125            scrollToPosition(smooth, spinner.getSelectedItemPosition());
126        } else {
127            scrollToPositionWithOffset(smooth, spinner.getSelectedItemPosition(), offset);
128        }
129    }
130
131    private void initSpinner() {
132        final Spinner spinner = (Spinner) findViewById(R.id.spinner);
133        spinner.setAdapter(new BaseAdapter() {
134            @Override
135            public int getCount() {
136                return mRecyclerView.getAdapter().getItemCount();
137            }
138
139            @Override
140            public Integer getItem(int position) {
141                return position;
142            }
143
144            @Override
145            public long getItemId(int position) {
146                return position;
147            }
148
149            @Override
150            public View getView(int position, View convertView, ViewGroup parent) {
151                if (convertView == null) {
152                    convertView = new TextView(parent.getContext());
153                }
154                ((TextView) convertView).setText(" " + position + " ");
155                return convertView;
156            }
157        });
158    }
159
160    protected void scrollToPosition(boolean smooth, int position) {
161        if (smooth) {
162            mRecyclerView.smoothScrollToPosition(position);
163        } else {
164            mRecyclerView.scrollToPosition(position);
165        }
166    }
167
168    protected void scrollToPositionWithOffset(boolean smooth, int position, int offset) {
169        scrollToPosition(smooth, position);
170    }
171
172    protected ConfigToggle[] createConfigToggles() {
173        return new ConfigToggle[] {};
174    }
175
176    private RecyclerView.Adapter mConfigAdapter = new RecyclerView.Adapter<ConfigViewHolder>() {
177        @Override
178        public ConfigViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
179            return new ConfigViewHolder(LayoutInflater.from(parent.getContext())
180                    .inflate(R.layout.config_view_toggle, parent, false));
181        }
182
183        @Override
184        public void onBindViewHolder(ConfigViewHolder holder, int position) {
185            ConfigToggle toggle = mConfigToggles[position];
186            holder.bind(toggle);
187        }
188
189        @Override
190        public int getItemCount() {
191            return mConfigToggles.length;
192        }
193    };
194}
195