/* * Copyright (C) 2014 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.android.settings; import android.annotation.Nullable; import android.content.Context; import android.graphics.drawable.Drawable; import android.preference.Preference; import android.text.TextUtils; import android.util.AttributeSet; import android.view.View; import android.widget.TextView; /** * A preference item that can dim the icon when it's disabled, either directly or because its parent * is disabled. */ public class DimmableIconPreference extends Preference { private static final int ICON_ALPHA_ENABLED = 255; private static final int ICON_ALPHA_DISABLED = 102; private final CharSequence mContentDescription; public DimmableIconPreference(Context context, AttributeSet attrs) { super(context, attrs); mContentDescription = null; } public DimmableIconPreference(Context context, @Nullable CharSequence contentDescription) { super(context); mContentDescription = contentDescription; } private void dimIcon(boolean dimmed) { Drawable icon = getIcon(); if (icon != null) { icon.mutate().setAlpha(dimmed ? ICON_ALPHA_DISABLED : ICON_ALPHA_ENABLED); setIcon(icon); } } @Override public void onParentChanged(Preference parent, boolean disableChild) { dimIcon(disableChild); super.onParentChanged(parent, disableChild); } @Override public void setEnabled(boolean enabled) { dimIcon(!enabled); super.setEnabled(enabled); } @Override protected void onBindView(View view) { super.onBindView(view); if (!TextUtils.isEmpty(mContentDescription)) { final TextView titleView = (TextView) view.findViewById(android.R.id.title); titleView.setContentDescription(mContentDescription); } } }