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 
17 package com.android.systemui.volume;
18 
19 import android.content.Context;
20 import android.graphics.Typeface;
21 import android.util.AttributeSet;
22 import android.view.LayoutInflater;
23 import android.view.View;
24 import android.widget.Button;
25 import android.widget.LinearLayout;
26 import android.widget.TextView;
27 
28 import com.android.systemui.R;
29 
30 import java.util.Objects;
31 
32 public 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     private final LayoutInflater mInflater;
39     private final SpTexts mSpTexts;
40 
41     private Callback mCallback;
42     private Object mSelectedValue;
43 
SegmentedButtons(Context context, AttributeSet attrs)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 
setCallback(Callback callback)52     public void setCallback(Callback callback) {
53         mCallback = callback;
54     }
55 
getSelectedValue()56     public Object getSelectedValue() {
57         return mSelectedValue;
58     }
59 
setSelectedValue(Object value, boolean fromClick)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             c.setTypeface(selected ? MEDIUM : REGULAR);
69         }
70         fireOnSelected(fromClick);
71     }
72 
addButton(int labelResId, int contentDescriptionResId, Object value)73     public void addButton(int labelResId, int contentDescriptionResId, Object value) {
74         final Button b = (Button) mInflater.inflate(R.layout.segmented_button, this, false);
75         b.setTag(LABEL_RES_KEY, labelResId);
76         b.setText(labelResId);
77         b.setContentDescription(getResources().getString(contentDescriptionResId));
78         final LayoutParams lp = (LayoutParams) b.getLayoutParams();
79         if (getChildCount() == 0) {
80             lp.leftMargin = lp.rightMargin = 0; // first button has no margin
81         }
82         b.setLayoutParams(lp);
83         addView(b);
84         b.setTag(value);
85         b.setOnClickListener(mClick);
86         Interaction.register(b, new Interaction.Callback() {
87             @Override
88             public void onInteraction() {
89                 fireInteraction();
90             }
91         });
92         mSpTexts.add(b);
93     }
94 
updateLocale()95     public void updateLocale() {
96         for (int i = 0; i < getChildCount(); i++) {
97             final Button b = (Button) getChildAt(i);
98             final int labelResId = (Integer) b.getTag(LABEL_RES_KEY);
99             b.setText(labelResId);
100         }
101     }
102 
fireOnSelected(boolean fromClick)103     private void fireOnSelected(boolean fromClick) {
104         if (mCallback != null) {
105             mCallback.onSelected(mSelectedValue, fromClick);
106         }
107     }
108 
fireInteraction()109     private void fireInteraction() {
110         if (mCallback != null) {
111             mCallback.onInteraction();
112         }
113     }
114 
115     private final View.OnClickListener mClick = new View.OnClickListener() {
116         @Override
117         public void onClick(View v) {
118             setSelectedValue(v.getTag(), true /* fromClick */);
119         }
120     };
121 
122     public interface Callback extends Interaction.Callback {
onSelected(Object value, boolean fromClick)123         void onSelected(Object value, boolean fromClick);
124     }
125 }
126