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HiDPI and UI-scaling support for Java-Swing via the PLaF mechanism

There is a newer version: 0.10

/*
 * Copyright 2016 the original author or authors.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 *
 * This project is hosted at: https://github.com/lukeu/swing-dpi
 * Comments & collaboration are both welcome.
 */

package com.github.swingdpi.plaf;

import java.awt.Font;

import javax.swing.Icon;
import javax.swing.plaf.FontUIResource;

public class NimbusTweaker extends BasicTweaker {

    public NimbusTweaker(float scaleFactor) {
        super(scaleFactor);
    }

    @Override
    public void initialTweaks() {

        Font font = uiDefaults.getFont("defaultFont");

        if (font != null) {
            uiDefaults.put("defaultFont", new FontUIResource(
                    font.getName(), font.getStyle(), Math.round(font.getSize() * scaleFactor)));
        }
    }

    /**
     * Don't attempt to scale fonts - in Nimbus, setting "defaultFont" is sufficient as this will
     * be inherited by all others.
     */
    @Override
    public Font modifyFont(Object key, Font original) {
        return original;
    }

    /**
     * Scaling Radio or CheckBox button icons leads to really weird artifacts in Nimbus. Their
     * selection state is generally not rendered. We therefore disable all scaling.
     */
    @Override
    public Icon modifyIcon(Object key, Icon original) {

        // TODO: disable more selectively?
        // Scaling seems problematic - scaled icons are not reset in the UIDefaults?
        // (Perhaps something to do with UI multiplexing & not overriding the correct data table??)
        return original;
    }
}