ui/text/TextStyling-Java/app/src/main/java/com/android/example/text/styling/renderer/spans/CodeBlockSpan.java

/*
 * Copyright (C) 2018 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.example.text.styling.renderer.spans;

import android.graphics.Typeface;
import android.support.annotation.ColorInt;
import android.support.annotation.NonNull;
import android.text.TextPaint;
import android.text.style.BackgroundColorSpan;

/**
 * To draw a code block, we set a font for the text and a background color.
 * The same effect can be achieved if on a text block, we set two spans: {@link FontSpan} and
 * {@link BackgroundColorSpan}
 */
public class CodeBlockSpan extends FontSpan {

    private final @ColorInt int backgroundColor;

    public CodeBlockSpan(@NonNull final Typeface font, final @ColorInt int backgroundColor) {
        super(font);
        this.backgroundColor = backgroundColor;
    }

    // Since we're only changing the background color, it will not affect the measure state, so
    // just override the update draw state.
    @Override
    public void updateDrawState(TextPaint textPaint) {
        super.updateDrawState(textPaint);
        textPaint.bgColor = backgroundColor;
    }
}