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      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.camera.ui;
     18 
     19 import android.content.Context;
     20 import android.content.res.TypedArray;
     21 import android.graphics.drawable.Drawable;
     22 import android.util.AttributeSet;
     23 import android.view.View;
     24 
     25 import com.android.camera2.R;
     26 
     27 /**
     28  * A LienearLayout for a set of {@link android.view.View}s,
     29  * one of which can be selected at any time.
     30  */
     31 public class RadioOptions extends TopRightWeightedLayout {
     32     /**
     33      * Listener for responding to {@link android.view.View} click events.
     34      */
     35     public interface OnOptionClickListener {
     36         /**
     37          * Override to respond to  {@link android.view.View} click events.
     38          * @param v {@link android.view.View} that was clicked.
     39          */
     40         public void onOptionClicked(View v);
     41     }
     42 
     43     private Drawable mBackground;
     44     private OnOptionClickListener mOnOptionClickListener;
     45 
     46     /**
     47      * Set the OnOptionClickListener.
     48      * @params listener The listener to set.
     49      */
     50     public void setOnOptionClickListener(OnOptionClickListener listener) {
     51         mOnOptionClickListener = listener;
     52     }
     53 
     54     /**
     55      * Constructor that is called when inflating a view from XML.
     56      * @params context The Context the view is running in, through which it can access the current theme, resources, etc.
     57      * @params attrs The attributes of the XML tag that is inflating the view.
     58      */
     59     public RadioOptions(Context context, AttributeSet attrs) {
     60         super(context, attrs);
     61 
     62         TypedArray a = context.getTheme().obtainStyledAttributes(
     63             attrs,
     64             R.styleable.RadioOptions,
     65             0, 0);
     66         int drawableId = a.getResourceId(R.styleable.RadioOptions_selected_drawable, 0);
     67         if (drawableId > 0) {
     68             mBackground = context.getResources()
     69                 .getDrawable(drawableId);
     70         }
     71     }
     72 
     73     @Override
     74     public void onFinishInflate() {
     75         super.onFinishInflate();
     76         updateListeners();
     77     }
     78 
     79     /**
     80      * Update each child {@link android.view.View}'s {@link android.view.View.OnClickListener}.
     81      * Call this if the child views are added after the OnOptionClickListener,
     82      * e.g. if the child views are added programatically.
     83      */
     84     public void updateListeners() {
     85         View.OnClickListener onClickListener = new View.OnClickListener() {
     86             @Override
     87             public void onClick(View button) {
     88                 setSelectedOptionByView(button);
     89             }
     90         };
     91 
     92         for (int i = 0; i < getChildCount(); i++) {
     93             View button = getChildAt(i);
     94             button.setOnClickListener(onClickListener);
     95         }
     96     }
     97 
     98     /**
     99      * Sets a child {@link android.view.View} as selected by tag.
    100      * @param tag Tag that identifies a child {@link android.view.View}. No effect if view not found.
    101      */
    102     public void setSelectedOptionByTag(Object tag) {
    103         View button = findViewWithTag(tag);
    104         setSelectedOptionByView(button);
    105     }
    106 
    107     /**
    108      * Sets a child {@link android.view.View} as selected by id.
    109      * @param id Resource ID  that identifies a child {@link android.view.View}. No effect if view not found.
    110      */
    111     public void setSeletedOptionById(int id) {
    112         View button = findViewById(id);
    113         setSelectedOptionByView(button);
    114     }
    115 
    116     private void setSelectedOptionByView(View view) {
    117         if (view != null) {
    118             // Reset all button states.
    119             for (int i = 0; i < getChildCount(); i++) {
    120                 getChildAt(i).setBackground(null);
    121             }
    122 
    123             // Highlight the appropriate button.
    124             view.setBackground(mBackground);
    125             if (mOnOptionClickListener != null) {
    126                 mOnOptionClickListener.onOptionClicked(view);
    127             }
    128         }
    129     }
    130 }