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/*
* 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);
}
}
}
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