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 */
16package com.example.android.supportv7.widget;
17
18import com.example.android.supportv7.Cheeses;
19import com.example.android.supportv7.R;
20import com.example.android.supportv7.widget.adapter.SimpleStringAdapter;
21import com.example.android.supportv7.widget.util.ConfigToggle;
22
23import android.support.v4.view.ViewCompat;
24import android.support.v7.widget.GridLayoutManager;
25import android.support.v7.widget.LinearLayoutManager;
26import android.support.v7.widget.RecyclerView;
27import android.view.View;
28import android.view.ViewGroup;
29
30/**
31 * A sample Activity to demonstrate capabilities of {@link GridLayoutManager}.
32 */
33public class GridLayoutManagerActivity extends BaseLayoutManagerActivity<GridLayoutManager> {
34    SimpleStringAdapter mAdapter;
35    @Override
36    protected GridLayoutManager createLayoutManager() {
37        GridLayoutManager lm = new GridLayoutManager(this, 3);
38        lm.setReverseLayout(true);
39        lm.setSpanSizeLookup(mSpanSizeLookup);
40        return lm;
41    }
42
43    GridLayoutManager.SpanSizeLookup mSpanSizeLookup = new GridLayoutManager.SpanSizeLookup() {
44        @Override
45        public int getSpanSize(int position) {
46            String item = mAdapter.getValueAt(position);
47            return 1 + (Math.abs(item.hashCode()) % mLayoutManager.getSpanCount());
48        }
49    };
50
51    @Override
52    protected ConfigToggle[] createConfigToggles() {
53        return new ConfigToggle[]{
54                new ConfigToggle(this, R.string.checkbox_orientation) {
55                    @Override
56                    public boolean isChecked() {
57                        return mLayoutManager.getOrientation() == LinearLayoutManager.HORIZONTAL;
58                    }
59
60                    @Override
61                    public void onChange(boolean newValue) {
62                        mLayoutManager.setOrientation(newValue ? LinearLayoutManager.HORIZONTAL
63                                : LinearLayoutManager.VERTICAL);
64                    }
65                },
66                new ConfigToggle(this, R.string.checkbox_reverse) {
67                    @Override
68                    public boolean isChecked() {
69                        return mLayoutManager.getReverseLayout();
70                    }
71
72                    @Override
73                    public void onChange(boolean newValue) {
74                        mLayoutManager.setReverseLayout(newValue);
75                    }
76                },
77                new ConfigToggle(this, R.string.checkbox_layout_dir) {
78                    @Override
79                    public boolean isChecked() {
80                        return ViewCompat.getLayoutDirection(mRecyclerView) ==
81                                ViewCompat.LAYOUT_DIRECTION_RTL;
82                    }
83
84                    @Override
85                    public void onChange(boolean newValue) {
86                        ViewCompat.setLayoutDirection(mRecyclerView, newValue ?
87                                ViewCompat.LAYOUT_DIRECTION_RTL : ViewCompat.LAYOUT_DIRECTION_LTR);
88                    }
89                },
90                new ConfigToggle(this, R.string.checkbox_stack_from_end) {
91                    @Override
92                    public boolean isChecked() {
93                        return mLayoutManager.getStackFromEnd();
94                    }
95
96                    @Override
97                    public void onChange(boolean newValue) {
98                        mLayoutManager.setStackFromEnd(newValue);
99                    }
100                }
101        };
102    }
103
104    @Override
105    protected void scrollToPositionWithOffset(boolean smooth, int position, int offset) {
106        if (smooth) {
107            super.scrollToPositionWithOffset(smooth, position, offset);
108        } else {
109            mLayoutManager.scrollToPositionWithOffset(position, offset);
110        }
111    }
112
113    protected RecyclerView.Adapter createAdapter() {
114        mAdapter = new SimpleStringAdapter(this, Cheeses.sCheeseStrings) {
115            @Override
116            public SimpleStringAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
117                    int viewType) {
118                final SimpleStringAdapter.ViewHolder vh = super
119                        .onCreateViewHolder(parent, viewType);
120                vh.itemView.setOnClickListener(new View.OnClickListener() {
121                    @Override
122                    public void onClick(View v) {
123                        final int pos = vh.getAdapterPosition();
124                        if (pos == RecyclerView.NO_POSITION) {
125                            return;
126                        }
127                        if (pos + 1 < getItemCount()) {
128                            swap(pos, pos + 1);
129                        }
130                    }
131                });
132                return vh;
133            }
134        };
135        return mAdapter;
136    }
137}
138