org.eclipse.swt.internal.SWTFontProvider Maven / Gradle / Ivy

Go to download
/*******************************************************************************
 * Copyright (c) 2024 Yatta Solutions and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     Yatta Solutions - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.internal;

import java.util.*;

import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;

/**
 * This internal class is used to provide and cache fonts scaled for different zoom levels in the win32
 * implementation. Depending on the configuration of the SWT application, either a default behavior or
 * the scaling behavior is used. The default behavior mimics the existing behavior that fonts are scaled
 * to the zoom of the primary monitor and are not updated on runtime. The scaling behavior will always
 * take the provided values for the zoom into consideration and return scaled variant of a font if necessary.
 */
public class SWTFontProvider {
	private static Map fontRegistries = new HashMap<>();

	private static SWTFontRegistry getFontRegistry(Device device) {
		return fontRegistries.computeIfAbsent(device, SWTFontProvider::newFontRegistry);
	}

	public static Font getSystemFont(Device device, int zoom) {
		return getFontRegistry(device).getSystemFont(zoom);
	}

	public static Font getFont(Device device, FontData fontData, int zoom) {
		return getFontRegistry(device).getFont(fontData, zoom);
	}

	public static void disposeFontRegistry(Device device) {
		SWTFontRegistry fontRegistry = fontRegistries.remove(device);
		if (fontRegistry != null) {
			fontRegistry.dispose();
		}
	}

	private static SWTFontRegistry newFontRegistry(Device device) {
		if (device instanceof Display display && display.isRescalingAtRuntime()) {
			return new ScalingSWTFontRegistry(device);
		}
		return new DefaultSWTFontRegistry(device);
	}
}