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     protected final LayoutInflater mInflater;
39     private final SpTexts mSpTexts;
40 
41     private Callback mCallback;
42     protected 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             setSelectedStyle(c, selected);
69         }
70         fireOnSelected(fromClick);
71     }
72 
setSelectedStyle(TextView textView, boolean selected)73     protected void setSelectedStyle(TextView textView, boolean selected) {
74         textView.setTypeface(selected ? MEDIUM : REGULAR);
75     }
76 
inflateButton()77     public Button inflateButton() {
78         return (Button) mInflater.inflate(R.layout.segmented_button, this, false);
79     }
80 
addButton(int labelResId, int contentDescriptionResId, Object value)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 
updateLocale()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 
fireOnSelected(boolean fromClick)111     private void fireOnSelected(boolean fromClick) {
112         if (mCallback != null) {
113             mCallback.onSelected(mSelectedValue, fromClick);
114         }
115     }
116 
fireInteraction()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 {
onSelected(Object value, boolean fromClick)131         void onSelected(Object value, boolean fromClick);
132     }
133 }
134