Home | History | Annotate | Download | only in volume 
      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 Typeface MEDIUM = Typeface.create("sans-serif-medium", Typeface.NORMAL);
     34     private static final Typeface BOLD = Typeface.create("sans-serif", Typeface.BOLD);
     35     private static final int LABEL_RES_KEY = R.id.label;
     36 
     37     private final Context mContext;
     38     private final LayoutInflater mInflater;
     39 
     40     private Callback mCallback;
     41     private Object mSelectedValue;
     42 
     43     public SegmentedButtons(Context context, AttributeSet attrs) {
     44         super(context, attrs);
     45         mContext = context;
     46         mInflater = LayoutInflater.from(mContext);
     47         setOrientation(HORIZONTAL);
     48     }
     49 
     50     public void setCallback(Callback callback) {
     51         mCallback = callback;
     52     }
     53 
     54     public Object getSelectedValue() {
     55         return mSelectedValue;
     56     }
     57 
     58     public void setSelectedValue(Object value) {
     59         if (Objects.equals(value, mSelectedValue)) return;
     60         mSelectedValue = value;
     61         for (int i = 0; i < getChildCount(); i++) {
     62             final TextView c = (TextView) getChildAt(i);
     63             final Object tag = c.getTag();
     64             final boolean selected = Objects.equals(mSelectedValue, tag);
     65             c.setSelected(selected);
     66             c.setTypeface(selected ? BOLD : MEDIUM);
     67         }
     68         fireOnSelected();
     69     }
     70 
     71     public void addButton(int labelResId, Object value) {
     72         final Button b = (Button) mInflater.inflate(R.layout.segmented_button, this, false);
     73         b.setTag(LABEL_RES_KEY, labelResId);
     74         b.setText(labelResId);
     75         final LayoutParams lp = (LayoutParams) b.getLayoutParams();
     76         if (getChildCount() == 0) {
     77             lp.leftMargin = lp.rightMargin = 0; // first button has no margin
     78         }
     79         b.setLayoutParams(lp);
     80         addView(b);
     81         b.setTag(value);
     82         b.setOnClickListener(mClick);
     83         Interaction.register(b, new Interaction.Callback() {
     84             @Override
     85             public void onInteraction() {
     86                 fireInteraction();
     87             }
     88         });
     89     }
     90 
     91     public void updateLocale() {
     92         for (int i = 0; i < getChildCount(); i++) {
     93             final Button b = (Button) getChildAt(i);
     94             final int labelResId = (Integer) b.getTag(LABEL_RES_KEY);
     95             b.setText(labelResId);
     96         }
     97     }
     98 
     99     private void fireOnSelected() {
    100         if (mCallback != null) {
    101             mCallback.onSelected(mSelectedValue);
    102         }
    103     }
    104 
    105     private void fireInteraction() {
    106         if (mCallback != null) {
    107             mCallback.onInteraction();
    108         }
    109     }
    110 
    111     private final View.OnClickListener mClick = new View.OnClickListener() {
    112         @Override
    113         public void onClick(View v) {
    114             setSelectedValue(v.getTag());
    115         }
    116     };
    117 
    118     public interface Callback extends Interaction.Callback {
    119         void onSelected(Object value);
    120     }
    121 }
    122