CustomTypefaceSpan

CustomTypefaceSpan.java

import android.graphics.Paint;
import android.graphics.Typeface;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.text.TextPaint;
import android.text.style.MetricAffectingSpan;

/**
 * @see android.text.style.TypefaceSpan
 */
public class CustomTypefaceSpan extends MetricAffectingSpan {
    @Nullable
    private Typeface typeface;

    @Nullable
    private Float textSize;

    @Nullable
    private Float letterSpacing;

    @Nullable
    private Integer alpha;

    @NonNull
    public CustomTypefaceSpan setTypeface(@Nullable Typeface typeface) {
        this.typeface = typeface;
        return this;
    }

    @NonNull
    public CustomTypefaceSpan setTextSize(@Nullable Float textSize) {
        this.textSize = textSize;
        return this;
    }

    @NonNull
    public CustomTypefaceSpan setLetterSpacing(@Nullable Float letterSpacing) {
        this.letterSpacing = letterSpacing;
        return this;
    }

    @NonNull
    public CustomTypefaceSpan setAlpha(@Nullable Integer alpha) {
        this.alpha = alpha;
        return this;
    }

    @Override
    public void updateDrawState(@NonNull TextPaint ds) {
        updateTypeface(ds);
    }

    @Override
    public void updateMeasureState(@NonNull TextPaint paint) {
        updateTypeface(paint);
    }

    private void updateTypeface(@NonNull Paint paint) {
        if (typeface != null) {
            paint.setTypeface(typeface);
        }

        if (textSize != null) {
            paint.setTextSize(textSize);
        }

        if (letterSpacing != null) {
            paint.setLetterSpacing(letterSpacing);
        }

        if (alpha != null) {
            paint.setAlpha(alpha);
        }
    }
}