DropdownBreadcrumb.java revision b8c54e773b1d4087a543f22bf02ea6421de09f5c 
1/*
2 * Copyright (C) 2016 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.android.documentsui;
18
19import android.content.Context;
20import android.util.AttributeSet;
21import android.view.LayoutInflater;
22import android.view.View;
23import android.view.ViewGroup;
24import android.widget.AdapterView;
25import android.widget.BaseAdapter;
26import android.widget.Spinner;
27import android.widget.TextView;
28
29import com.android.documentsui.NavigationViewManager.Breadcrumb;
30import com.android.documentsui.NavigationViewManager.Environment;
31import com.android.documentsui.model.DocumentInfo;
32import com.android.documentsui.model.RootInfo;
33
34import java.util.function.Consumer;
35
36/**
37 * Dropdown implementation of breadcrumb used for phone device layouts
38 */
39
40public final class DropdownBreadcrumb extends Spinner implements Breadcrumb {
41
42    private DropdownAdapter mAdapter;
43
44    public DropdownBreadcrumb(
45            Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
46        super(context, attrs, defStyleAttr, defStyleRes);
47    }
48
49    public DropdownBreadcrumb(Context context, AttributeSet attrs, int defStyleAttr) {
50        super(context, attrs, defStyleAttr);
51    }
52
53    public DropdownBreadcrumb(Context context, AttributeSet attrs) {
54        super(context, attrs);
55    }
56
57    public DropdownBreadcrumb(Context context) {
58        super(context);
59    }
60
61    @Override
62    public void setup(Environment env, State state, Consumer<Integer> listener) {
63        mAdapter = new DropdownAdapter(state, env);
64        setOnItemSelectedListener(
65                new OnItemSelectedListener() {
66                    @Override
67                    public void onItemSelected(
68                            AdapterView<?> parent, View view, int position, long id) {
69                        listener.accept(position);
70                    }
71
72                    @Override
73                    public void onNothingSelected(AdapterView<?> parent) {}
74                });
75    }
76
77    @Override
78    public void show(boolean visibility) {
79        if (visibility) {
80            setVisibility(VISIBLE);
81            setAdapter(mAdapter);
82        } else {
83            setVisibility(GONE);
84            setAdapter(null);
85        }
86    }
87
88    @Override
89    public void postUpdate() {
90        setSelection(mAdapter.getCount() - 1, false);
91    }
92
93    private static final class DropdownAdapter extends BaseAdapter {
94        private Environment mEnv;
95        private State mState;
96
97        public DropdownAdapter(State state, Environment env) {
98            mState = state;
99            mEnv = env;
100        }
101
102        @Override
103        public int getCount() {
104            return mState.stack.size();
105        }
106
107        @Override
108        public DocumentInfo getItem(int position) {
109            return mState.stack.get(mState.stack.size() - position - 1);
110        }
111
112        @Override
113        public long getItemId(int position) {
114            return position;
115        }
116
117        @Override
118        public View getView(int position, View convertView, ViewGroup parent) {
119            if (convertView == null) {
120                convertView = LayoutInflater.from(parent.getContext())
121                        .inflate(R.layout.item_subdir_title, parent, false);
122            }
123
124            final TextView title = (TextView) convertView.findViewById(android.R.id.title);
125            final DocumentInfo doc = getItem(position);
126
127            if (position == 0) {
128                final RootInfo root = mEnv.getCurrentRoot();
129                title.setText(root.title);
130            } else {
131                title.setText(doc.displayName);
132            }
133
134            return convertView;
135        }
136
137        @Override
138        public View getDropDownView(int position, View convertView, ViewGroup parent) {
139            if (convertView == null) {
140                convertView = LayoutInflater.from(parent.getContext())
141                        .inflate(R.layout.item_subdir, parent, false);
142            }
143
144            final TextView title = (TextView) convertView.findViewById(android.R.id.title);
145            final DocumentInfo doc = getItem(position);
146
147            if (position == 0) {
148                final RootInfo root = mEnv.getCurrentRoot();
149                title.setText(root.title);
150            } else {
151                title.setText(doc.displayName);
152            }
153
154            return convertView;
155        }
156    }
157
158}
159