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      1 /*
      2  * Copyright (C) 2018 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.settings.widget;
     18 
     19 import android.content.Context;
     20 import android.content.res.TypedArray;
     21 import android.support.v7.preference.CheckBoxPreference;
     22 import android.support.v7.preference.PreferenceViewHolder;
     23 import android.util.AttributeSet;
     24 import android.view.View;
     25 
     26 /**
     27  * A CheckboxPreference that can disable its checkbox separate from its text.
     28  * Differs from CheckboxPreference.setDisabled() in that the text is not dimmed.
     29  */
     30 public class DisabledCheckBoxPreference extends CheckBoxPreference {
     31     private PreferenceViewHolder mViewHolder;
     32     private View mCheckBox;
     33     private boolean mEnabledCheckBox;
     34 
     35     public DisabledCheckBoxPreference(Context context, AttributeSet attrs, int defStyleAttr,
     36             int defStyleRes) {
     37         super(context, attrs, defStyleAttr, defStyleRes);
     38         setupDisabledCheckBoxPreference(context, attrs, defStyleAttr, defStyleRes);
     39     }
     40 
     41     public DisabledCheckBoxPreference(Context context, AttributeSet attrs, int defStyleAttr) {
     42         super(context, attrs, defStyleAttr);
     43         setupDisabledCheckBoxPreference(context, attrs, defStyleAttr, 0);
     44     }
     45 
     46     public DisabledCheckBoxPreference(Context context, AttributeSet attrs) {
     47         super(context, attrs);
     48         setupDisabledCheckBoxPreference(context, attrs, 0, 0);
     49     }
     50 
     51     public DisabledCheckBoxPreference(Context context) {
     52         super(context);
     53         setupDisabledCheckBoxPreference(context, null, 0, 0);
     54     }
     55 
     56     private void setupDisabledCheckBoxPreference(Context context, AttributeSet attrs,
     57             int defStyleAttr, int defStyleRes) {
     58         final TypedArray a = context.obtainStyledAttributes(
     59                 attrs, com.android.internal.R.styleable.Preference, defStyleAttr, defStyleRes);
     60         for (int i = a.getIndexCount() - 1; i >= 0; i--) {
     61             int attr = a.getIndex(i);
     62             switch (attr) {
     63                 case com.android.internal.R.styleable.Preference_enabled:
     64                     mEnabledCheckBox = a.getBoolean(attr, true);
     65                     break;
     66             }
     67         }
     68         a.recycle();
     69 
     70         // Always tell super class this preference is enabled.
     71         // We manually enable/disable checkbox using enableCheckBox.
     72         super.setEnabled(true);
     73         enableCheckbox(mEnabledCheckBox);
     74     }
     75 
     76     public void enableCheckbox(boolean enabled) {
     77         mEnabledCheckBox = enabled;
     78         if (mViewHolder != null && mCheckBox != null) {
     79             mCheckBox.setEnabled(mEnabledCheckBox);
     80             mViewHolder.itemView.setEnabled(mEnabledCheckBox);
     81         }
     82     }
     83 
     84     @Override
     85     public void onBindViewHolder(PreferenceViewHolder holder) {
     86         super.onBindViewHolder(holder);
     87         mViewHolder = holder;
     88         mCheckBox = holder.findViewById(android.R.id.checkbox);
     89 
     90         enableCheckbox(mEnabledCheckBox);
     91     }
     92 
     93     @Override
     94     protected void performClick(View view) {
     95         // only perform clicks if the checkbox is enabled
     96         if (mEnabledCheckBox) {
     97             super.performClick(view);
     98         }
     99     }
    100 
    101 }
    102