SyntaxStyle.java

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/*
 * SyntaxStyle.java - A simple text style class
 * Copyright (C) 1999 Slava Pestov
 * Copyright (C) 2000-2015 The Gridarta Developers.
 *
 * You may use and modify this package for any purpose. Redistribution is
 * permitted, in both source and binary form, provided that this notice
 * remains intact in all source distributions of this package.
 */

package net.sf.gridarta.textedit.textarea;

import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import org.jetbrains.annotations.Nullable;

public class SyntaxStyle {

    private final Color color;

    private final boolean italic;

    private final boolean bold;

    private Font lastFont;

    private Font lastStyledFont;

    @Nullable
    private FontMetrics fontMetrics;

    public SyntaxStyle(final Color color, final boolean italic, final boolean bold) {
        this.color = color;
        this.italic = italic;
        this.bold = bold;
    }

    public Color getColor() {
        return color;
    }

    public boolean isPlain() {
        return !bold && !italic;
    }

    public boolean isItalic() {
        return italic;
    }

    public boolean isBold() {
        return bold;
    }

    private Font getStyledFont(final Font font) {
        if (font == null) {
            throw new IllegalArgumentException("font parameter must not be null");
        }

        updateStyledFont(font);
        return lastStyledFont;
    }

    public FontMetrics getFontMetrics(final Font font, final Graphics g) {
        if (font == null) {
            throw new IllegalArgumentException("font parameter must not be null");
        }

        updateStyledFont(font);
        if (fontMetrics == null) {
            fontMetrics = g.getFontMetrics(lastStyledFont);
        }
        assert fontMetrics != null;
        return fontMetrics;
    }

    public void setGraphicsFlags(final Graphics gfx, final Font font) {
        gfx.setFont(getStyledFont(font));
        gfx.setColor(color);
    }

    private void updateStyledFont(final Font font) {
        if (font.equals(lastFont)) {
            return;
        }

        lastStyledFont = new Font(font.getFamily(), (bold ? Font.BOLD : 0) | (italic ? Font.ITALIC : 0), font.getSize());
        lastFont = font;
        fontMetrics = null;
    }

    @Override
    public String toString() {
        return getClass().getName() + "[color=" + color + (italic ? ",italic" : "") + (bold ? ",bold" : "") + "]";
    }

}