TypefaceSpan.java

/*
 * Copyright 2013 Simple Finance Corporation. All rights reserved.
 *
 * 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.ticketmaster.servos.util;

import android.content.Context;
import android.graphics.Typeface;
import android.support.v4.util.LruCache;
import android.text.TextPaint;
import android.text.style.MetricAffectingSpan;

/**
 * Style a spannable with a custom {@link Typeface}.
 *
 * @author Tristan Waddington
 */
public class TypefaceSpan extends MetricAffectingSpan {

    /** An <code>LruCache</code> for previously loaded typefaces. */
    private static LruCache<String, Typeface> sTypefaceCache = new LruCache<String, Typeface>(5);

    private Typeface mTypeface;

    /**
     * Load the {@link Typeface} and apply to a spannable.
     * @param context An application or activity context.
     * @param typefacePathName The typeface name with path relative to the assets folder.
     */
    public TypefaceSpan(Context context, String typefacePathName) {
        mTypeface = sTypefaceCache.get(typefacePathName);

        if (mTypeface == null) {
            mTypeface = Typeface.createFromAsset(context.getApplicationContext().getAssets(), typefacePathName);

            // Cache the loaded Typeface
            sTypefaceCache.put(typefacePathName, mTypeface);
        }
    }

    @Override
    public void updateMeasureState(TextPaint p) {
        p.setTypeface(mTypeface);
    }

    @Override
    public void updateDrawState(TextPaint tp) {
        tp.setTypeface(mTypeface);
    }
}