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.settings; 18 19 import android.annotation.Nullable; 20 import android.content.Context; 21 import android.graphics.drawable.Drawable; 22 import android.support.v7.preference.Preference; 23 import android.support.v7.preference.PreferenceViewHolder; 24 import android.text.TextUtils; 25 import android.util.AttributeSet; 26 import android.widget.TextView; 27 28 import com.android.settingslib.RestrictedPreference; 29 30 /** 31 * A preference item that can dim the icon when it's disabled, either directly or because its parent 32 * is disabled. 33 */ 34 public class DimmableIconPreference extends RestrictedPreference { 35 private static final int ICON_ALPHA_ENABLED = 255; 36 private static final int ICON_ALPHA_DISABLED = 102; 37 38 private final CharSequence mContentDescription; 39 40 public DimmableIconPreference(Context context) { 41 this(context, (AttributeSet) null); 42 } 43 44 public DimmableIconPreference(Context context, AttributeSet attrs) { 45 super(context, attrs); 46 mContentDescription = null; 47 useAdminDisabledSummary(true); 48 } 49 50 public DimmableIconPreference(Context context, @Nullable CharSequence contentDescription) { 51 super(context); 52 mContentDescription = contentDescription; 53 useAdminDisabledSummary(true); 54 } 55 56 private void dimIcon(boolean dimmed) { 57 Drawable icon = getIcon(); 58 if (icon != null) { 59 icon.mutate().setAlpha(dimmed ? ICON_ALPHA_DISABLED : ICON_ALPHA_ENABLED); 60 setIcon(icon); 61 } 62 } 63 64 @Override 65 public void onBindViewHolder(PreferenceViewHolder view) { 66 super.onBindViewHolder(view); 67 if (!TextUtils.isEmpty(mContentDescription)) { 68 final TextView titleView = (TextView) view.findViewById(android.R.id.title); 69 titleView.setContentDescription(mContentDescription); 70 } 71 dimIcon(!isEnabled()); 72 } 73 } 74
