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.android.systemui.volume;
18
19import android.content.Context;
20import android.graphics.Typeface;
21import android.util.AttributeSet;
22import android.view.LayoutInflater;
23import android.view.View;
24import android.widget.Button;
25import android.widget.LinearLayout;
26import android.widget.TextView;
27
28import com.android.systemui.R;
29
30import java.util.Objects;
31
32public class SegmentedButtons extends LinearLayout {
33    private static final int LABEL_RES_KEY = R.id.label;
34    private static final Typeface REGULAR = Typeface.create("sans-serif", Typeface.NORMAL);
35    private static final Typeface MEDIUM = Typeface.create("sans-serif-medium", Typeface.NORMAL);
36
37    private final Context mContext;
38    protected final LayoutInflater mInflater;
39    private final SpTexts mSpTexts;
40
41    private Callback mCallback;
42    protected Object mSelectedValue;
43
44    public SegmentedButtons(Context context, AttributeSet attrs) {
45        super(context, attrs);
46        mContext = context;
47        mInflater = LayoutInflater.from(mContext);
48        setOrientation(HORIZONTAL);
49        mSpTexts = new SpTexts(mContext);
50    }
51
52    public void setCallback(Callback callback) {
53        mCallback = callback;
54    }
55
56    public Object getSelectedValue() {
57        return mSelectedValue;
58    }
59
60    public void setSelectedValue(Object value, boolean fromClick) {
61        if (Objects.equals(value, mSelectedValue)) return;
62        mSelectedValue = value;
63        for (int i = 0; i < getChildCount(); i++) {
64            final TextView c = (TextView) getChildAt(i);
65            final Object tag = c.getTag();
66            final boolean selected = Objects.equals(mSelectedValue, tag);
67            c.setSelected(selected);
68            setSelectedStyle(c, selected);
69        }
70        fireOnSelected(fromClick);
71    }
72
73    protected void setSelectedStyle(TextView textView, boolean selected) {
74        textView.setTypeface(selected ? MEDIUM : REGULAR);
75    }
76
77    public Button inflateButton() {
78        return (Button) mInflater.inflate(R.layout.segmented_button, this, false);
79    }
80
81    public void addButton(int labelResId, int contentDescriptionResId, Object value) {
82        final Button b = inflateButton();
83        b.setTag(LABEL_RES_KEY, labelResId);
84        b.setText(labelResId);
85        b.setContentDescription(getResources().getString(contentDescriptionResId));
86        final LayoutParams lp = (LayoutParams) b.getLayoutParams();
87        if (getChildCount() == 0) {
88            lp.leftMargin = lp.rightMargin = 0; // first button has no margin
89        }
90        b.setLayoutParams(lp);
91        addView(b);
92        b.setTag(value);
93        b.setOnClickListener(mClick);
94        Interaction.register(b, new Interaction.Callback() {
95            @Override
96            public void onInteraction() {
97                fireInteraction();
98            }
99        });
100        mSpTexts.add(b);
101    }
102
103    public void updateLocale() {
104        for (int i = 0; i < getChildCount(); i++) {
105            final Button b = (Button) getChildAt(i);
106            final int labelResId = (Integer) b.getTag(LABEL_RES_KEY);
107            b.setText(labelResId);
108        }
109    }
110
111    private void fireOnSelected(boolean fromClick) {
112        if (mCallback != null) {
113            mCallback.onSelected(mSelectedValue, fromClick);
114        }
115    }
116
117    private void fireInteraction() {
118        if (mCallback != null) {
119            mCallback.onInteraction();
120        }
121    }
122
123    private final View.OnClickListener mClick = new View.OnClickListener() {
124        @Override
125        public void onClick(View v) {
126            setSelectedValue(v.getTag(), true /* fromClick */);
127        }
128    };
129
130    public interface Callback extends Interaction.Callback {
131        void onSelected(Object value, boolean fromClick);
132    }
133}
134