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A themeable Look and Feel for java swing
/*
* MIT License
*
* Copyright (c) 2021 Jannis Weis
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
* associated documentation files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge, publish, distribute,
* sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or
* substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
* NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
package com.github.weisj.darklaf.task;
import java.awt.*;
import java.awt.font.TextAttribute;
import java.text.AttributedCharacterIterator;
import java.util.*;
import java.util.List;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.logging.Logger;
import javax.swing.*;
import javax.swing.plaf.UIResource;
import com.github.weisj.darklaf.DarkLaf;
import com.github.weisj.darklaf.PropertyLoader;
import com.github.weisj.darklaf.theme.Theme;
import com.github.weisj.darklaf.theme.info.FontSizeRule;
import com.github.weisj.darklaf.uiresource.DarkFontUIResource;
import com.github.weisj.darklaf.util.FontUtil;
import com.github.weisj.darklaf.util.LogUtil;
import com.github.weisj.darklaf.util.PropertyUtil;
import com.github.weisj.darklaf.util.SystemInfo;
import com.github.weisj.darklaf.util.graphics.GraphicsUtil;
public class FontDefaultsInitTask implements DefaultsInitTask {
private static final Logger LOGGER = LogUtil.getLogger(FontDefaultsInitTask.class);
private static final String SWING_AA_KEY = "swing.aatext";
private static final String SWING_AA_DEFAULT_VALUE = "true";
private static final String FONT_PROPERTY_PATH = "properties/";
private static final String FONT_SIZE_DEFAULTS_NAME = "font_sizes";
private static final String FONT_DEFAULTS_NAME = "font";
private static final String KERNING_ALLOW_LIST = "kerning.allowList";
private static final String KERNING_BLOCK_LIST = "kerning.blockList";
/*
* Per https://docs.oracle.com/javase/7/docs/api/java/awt/RenderingHints.html#
* VALUE_TEXT_ANTIALIAS_LCD_HRGB a minimum bit depth of 15 is recommended for using lcd text
* antialiasing.
*/
private static final int LCD_TEXT_ANTIALIASING_MIN_BIT_DEPTH = 15;
private static final String ALL_FONTS = "__all__";
private static final Map ENABLE_KERNING =
Collections.singletonMap(TextAttribute.KERNING, TextAttribute.KERNING_ON);
private static final Map DISABLE_KERNING =
Collections.singletonMap(TextAttribute.KERNING, null);
/*
* On Catalina the are issues with font kerning and .AppleSystemUIFont. For now Helvetica Neue is
* used instead.
*/
private static final String MAC_OS_CATALINA_FONT_NAME = ".AppleSystemUIFont";
private static final String MAC_OS_CATALINA_FONT_NAME_FALLBACK = "Helvetica Neue";
private static final String MAC_OS_FONT_NAME = ".SF NS Text";
private static final String WINDOWS_10_FONT_NAME = "Segoe UI";
private static final String WINDOWS_10_MONO_FONT_NAME = "Consolas";
@Override
public void run(final Theme currentTheme, final UIDefaults defaults) {
loadFontProperties(defaults);
if (SystemInfo.isMac) {
patchOSFonts(defaults, this::mapMacOSFont);
} else if (SystemInfo.isWindows) {
patchOSFonts(defaults, this::mapWindowsFont);
}
if (SystemInfo.isMacOSCatalina) {
defaults.put(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
}
if (systemKerningEnabled()) {
List allowedFonts = PropertyUtil.getList(defaults, KERNING_ALLOW_LIST, String.class);
List blockedFonts = PropertyUtil.getList(defaults, KERNING_BLOCK_LIST, String.class);
if (!allowedFonts.isEmpty()) {
Set allowedFontsSet = new HashSet<>(allowedFonts);
Set blockedFontSet = new HashSet<>(blockedFonts);
boolean enabledAll = ALL_FONTS.equals(allowedFonts.get(0));
setupKerningPerFont(defaults,
key -> (enabledAll || allowedFontsSet.contains(key)) && !blockedFontSet.contains(key));
}
}
applyFontRule(currentTheme, defaults);
setupRenderingHints(defaults);
defaults.remove(KERNING_ALLOW_LIST);
defaults.remove(KERNING_BLOCK_LIST);
}
private boolean systemKerningEnabled() {
if (SystemInfo.isMac) return SystemInfo.isMacOSMojave;
if (SystemInfo.isWindows) return SystemInfo.isWindowsVista;
return false;
}
private void setupRenderingHints(final UIDefaults defaults) {
if (!SystemInfo.isMacOSMojave) {
PropertyUtil.installSystemProperty(SWING_AA_KEY, SWING_AA_DEFAULT_VALUE);
Toolkit toolkit = Toolkit.getDefaultToolkit();
Map desktopHints = (Map) toolkit.getDesktopProperty(GraphicsUtil.DESKTOP_HINTS_KEY);
if (desktopHints == null) {
desktopHints = Collections.emptyMap();
}
Object aaHint = desktopHints.get(RenderingHints.KEY_TEXT_ANTIALIASING);
Object lcdContrastHint = desktopHints.get(RenderingHints.KEY_TEXT_LCD_CONTRAST);
if (!GraphicsEnvironment.isHeadless()) {
if (aaHint == null) {
GraphicsDevice device = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
DisplayMode displayMode = device.getDisplayMode();
int bitDepth = displayMode.getBitDepth();
boolean appropriateBitDepth =
bitDepth >= LCD_TEXT_ANTIALIASING_MIN_BIT_DEPTH || bitDepth == DisplayMode.BIT_DEPTH_MULTI;
// LCD Subpixel AA shouldn't be turned on for printer devices.
boolean appropriateDisplayMode = device.getType() != GraphicsDevice.TYPE_PRINTER;
if (appropriateBitDepth && appropriateDisplayMode) {
aaHint = RenderingHints.VALUE_TEXT_ANTIALIAS_LCD_HRGB;
} else {
aaHint = RenderingHints.VALUE_TEXT_ANTIALIAS_ON;
}
// The fallback value is an educated guess so issue a warning for the user.
String message = "System property 'awt.useSystemAAFontSettings' is not set. Using '" + aaHint
+ "'\nIt's recommended to manually add the property to the JVM startup parameters on your "
+ "platform for optimal text antialiasing. Refer to the "
+ "[documentation](https://docs.oracle.com/javase/8/docs/technotes/guides/2d/flags.html#aaFonts)"
+ "for more information on the possible values.";
if (!SystemInfo.isJava9OrGreater) {
message += "\n";
message += "If you are using a Java version of 8 or earlier try switching to at least Java 9 "
+ "for improved scaling and font rendering support.";
}
LOGGER.warning(message);
}
}
if (aaHint != null) {
LOGGER.fine(String.format("Setting '%s' = '%s'", RenderingHints.KEY_TEXT_ANTIALIASING, aaHint));
defaults.put(RenderingHints.KEY_TEXT_ANTIALIASING, aaHint);
}
if (lcdContrastHint != null) {
LOGGER.fine(
String.format("Setting '%s' = '%s'", RenderingHints.KEY_TEXT_LCD_CONTRAST, lcdContrastHint));
defaults.put(RenderingHints.KEY_TEXT_LCD_CONTRAST, lcdContrastHint);
}
}
}
private void loadFontProperties(final UIDefaults defaults) {
Properties fontSizeProps =
PropertyLoader.loadProperties(DarkLaf.class, FONT_SIZE_DEFAULTS_NAME, FONT_PROPERTY_PATH);
PropertyLoader.putProperties(fontSizeProps, defaults);
Properties fontProps = PropertyLoader.loadProperties(DarkLaf.class, FONT_DEFAULTS_NAME, FONT_PROPERTY_PATH);
PropertyLoader.putProperties(fontProps, defaults);
}
private void patchOSFonts(final UIDefaults defaults, final Function, Font> mapper) {
PropertyLoader.replacePropertyEntriesOfType(Font.class, defaults,
e -> isDefaultFont(e.getValue()) || isMonospaceDefault(e.getValue()), mapper);
}
private boolean isDefaultFont(final Font font) {
return Font.DIALOG.equals(font.getFamily());
}
private boolean isMonospaceDefault(final Font font) {
return Font.MONOSPACED.equals(font.getFamily());
}
private Font mapMacOSFont(final Map.Entry entry) {
Font font = entry.getValue();
if (isMonospaceDefault(font)) return font;
String fontName = SystemInfo.isMacOSCatalina
? MAC_OS_CATALINA_FONT_NAME_FALLBACK
: MAC_OS_FONT_NAME;
Font macFont = FontUtil.createFont(fontName, font.getStyle(), font.getSize());
if (SystemInfo.isMacOSMojave) macFont = macFont.deriveFont(ENABLE_KERNING);
if (font instanceof UIResource) {
macFont = new DarkFontUIResource(macFont);
}
return macFont == null ? font : macFont;
}
private Font mapWindowsFont(final Map.Entry entry) {
Font font = entry.getValue();
if (!SystemInfo.isWindowsVista) return font;
String fontName = isMonospaceDefault(font)
? WINDOWS_10_MONO_FONT_NAME
: WINDOWS_10_FONT_NAME;
Font windowsFont = FontUtil.createFont(fontName, font.getStyle(), font.getSize());
if (font instanceof UIResource) {
windowsFont = new DarkFontUIResource(windowsFont);
}
return windowsFont;
}
private void setupKerningPerFont(final UIDefaults defaults, final Predicate kerningPredicate) {
PropertyLoader.replacePropertiesOfType(Font.class, defaults, e -> kerningPredicate.test(e.getKey().toString()),
f -> {
Font font = f.deriveFont(ENABLE_KERNING);
if (f instanceof UIResource) font = new DarkFontUIResource(font);
return font;
});
}
private void applyFontRule(final Theme currentTheme, final UIDefaults defaults) {
FontSizeRule rule = currentTheme.getFontSizeRule();
if (rule == null || rule.getType() == FontSizeRule.AdjustmentType.NO_ADJUSTMENT) return;
PropertyLoader.replacePropertiesOfType(Font.class, defaults, f -> fontWithRule(f, rule));
}
private Font fontWithRule(final Font font, final FontSizeRule rule) {
if (font == null) return null;
float size = font.getSize2D();
float newSize = rule.adjustFontSize(size);
if (newSize == size) return font;
if (newSize <= 0) {
LOGGER.warning("Font " + font + " would be invisible after applying " + rule + ". Font won't be changed!");
return font;
}
Font withRule = font.deriveFont(newSize);
if (font instanceof UIResource && !(withRule instanceof UIResource)) {
withRule = new DarkFontUIResource(withRule);
}
return withRule;
}
}
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