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HanSolo/Detector.java

Last active Mar 4, 2021
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Detector: A plain Java class that offers some utility methods to detect dark theme on MacOS and Windows
import javafx.scene.paint.Color;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringWriter;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
public class Detector {
public enum OperatingSystem { WINDOWS, MACOS, LINUX, SOLARIS, NONE }
public enum MacOSSystemColor {
BLUE(Color.rgb(0, 122, 255), Color.rgb(10, 132, 255)),
BROWN(Color.rgb(162, 132, 94), Color.rgb(172, 142, 104)),
GRAY(Color.rgb(142, 142, 147), Color.rgb(152, 152, 157)),
GREEN(Color.rgb(40, 205, 65), Color.rgb(50, 215, 75)),
INIDIGO(Color.rgb(88, 86, 214), Color.rgb(94, 92, 230)),
ORANGE(Color.rgb(255, 149, 0), Color.rgb(255, 159, 0)),
PINK(Color.rgb(255, 45, 85), Color.rgb(255, 55, 95)),
PURPLE(Color.rgb(175, 82, 222), Color.rgb(191, 90, 242)),
RED(Color.rgb(255, 59, 48), Color.rgb(255, 69, 58)),
TEAL(Color.rgb(85, 190, 240), Color.rgb(90, 200, 245)),
YELLOW(Color.rgb(255, 204, 0), Color.rgb(255, 214, 10));
final Color colorAqua;
final Color colorDark;
MacOSSystemColor(final Color colorAqua, final Color colorDark) {
this.colorAqua = colorAqua;
this.colorDark = colorDark;
}
public Color getColorAqua() { return colorAqua; }
public Color getColorDark() { return colorDark; }
public boolean isGivenColor(final Color color) {
return (colorAqua.equals(color) || colorDark.equals(color));
}
public static final List<MacOSSystemColor> getAsList() { return Arrays.asList(values()); }
}
public enum MacOSAccentColor {
MULTI_COLOR(null, MacOSSystemColor.BLUE.colorAqua, MacOSSystemColor.BLUE.colorDark),
GRAPHITE(-1, MacOSSystemColor.GRAY.colorAqua, MacOSSystemColor.GRAY.colorDark),
RED(0, MacOSSystemColor.RED.colorAqua, MacOSSystemColor.RED.colorDark),
ORANGE(1, MacOSSystemColor.ORANGE.colorAqua, MacOSSystemColor.ORANGE.colorDark),
YELLOW(2, MacOSSystemColor.YELLOW.colorAqua, MacOSSystemColor.YELLOW.colorDark),
GREEN(3, MacOSSystemColor.GREEN.colorAqua, MacOSSystemColor.GREEN.colorDark),
BLUE(4, MacOSSystemColor.BLUE.colorAqua, MacOSSystemColor.BLUE.colorDark),
PURPLE(5, MacOSSystemColor.PURPLE.colorAqua, MacOSSystemColor.PURPLE.colorDark),
PINK(6, MacOSSystemColor.PINK.colorAqua, MacOSSystemColor.PINK.colorDark);
final Integer key;
final Color colorAqua;
final Color colorDark;
MacOSAccentColor(final Integer key, final Color colorAqua, final Color colorDark) {
this.key = key;
this.colorAqua = colorAqua;
this.colorDark = colorDark;
}
public Integer getKey() { return key; }
public Color getColorAqua() { return colorAqua; }
public Color getColorDark() { return colorDark; }
public boolean isGivenColor(final Color color) {
return (colorAqua.equals(color) || colorDark.equals(color));
}
public static final List<MacOSAccentColor> getAsList() { return Arrays.asList(values()); }
}
private static final String REGQUERY_UTIL = "reg query ";
private static final String REGDWORD_TOKEN = "REG_DWORD";
private static final String DARK_THEME_CMD = REGQUERY_UTIL + "\"HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize\"" + " /v AppsUseLightTheme";
public static final Map<Integer, Color[]> MACOS_ACCENT_COLOR_MAP = Map.of(-1, new Color[] { MacOSSystemColor.GRAY.colorAqua, MacOSSystemColor.GRAY.colorDark },
0, new Color[] { MacOSSystemColor.RED.colorAqua, MacOSSystemColor.RED.colorDark },
1, new Color[] { MacOSSystemColor.ORANGE.colorAqua, MacOSSystemColor.ORANGE.colorDark },
2, new Color[] { MacOSSystemColor.YELLOW.colorAqua, MacOSSystemColor.YELLOW.colorDark },
3, new Color[] { MacOSSystemColor.GREEN.colorAqua, MacOSSystemColor.GREEN.colorDark },
4, new Color[] { MacOSSystemColor.BLUE.colorAqua, MacOSSystemColor.BLUE.colorDark },
5, new Color[] { MacOSSystemColor.PURPLE.colorAqua, MacOSSystemColor.PURPLE.colorDark },
6, new Color[] { MacOSSystemColor.PINK.colorAqua, MacOSSystemColor.PINK.colorDark });
public static final boolean isDarkMode() {
switch(getOperatingSystem()) {
case WINDOWS: return isWindowsDarkMode();
case MACOS : return isMacOsDarkMode();
case LINUX :
case SOLARIS:
default : return false;
}
}
public static final boolean isMacOsDarkMode() {
try {
boolean isDarkMode = false;
Runtime runtime = Runtime.getRuntime();
Process process = runtime.exec("defaults read -g AppleInterfaceStyle");
InputStreamReader isr = new InputStreamReader(process.getInputStream());
BufferedReader rdr = new BufferedReader(isr);
String line;
while((line = rdr.readLine()) != null) {
if (line.equals("Dark")) { isDarkMode = true; }
}
int rc = process.waitFor(); // Wait for the process to complete
return 0 == rc && isDarkMode;
} catch (IOException | InterruptedException e) {
return false;
}
}
public static boolean isWindowsDarkMode() {
try {
Process process = Runtime.getRuntime().exec(DARK_THEME_CMD);
StreamReader reader = new StreamReader(process.getInputStream());
reader.start();
process.waitFor();
reader.join();
String result = reader.getResult();
int p = result.indexOf(REGDWORD_TOKEN);
if (p == -1) { return false; }
// 1 == Light Mode, 0 == Dark Mode
String temp = result.substring(p + REGDWORD_TOKEN.length()).trim();
return ((Integer.parseInt(temp.substring("0x".length()), 16))) == 0;
}
catch (Exception e) {
return false;
}
}
public static Color getMacOSAccentColor() {
if (OperatingSystem.MACOS != getOperatingSystem()) { return MacOSAccentColor.MULTI_COLOR.getColorAqua(); }
final boolean isDarkMode = isMacOsDarkMode();
try {
Integer colorKey = null;
Runtime runtime = Runtime.getRuntime();
Process process = runtime.exec("defaults read -g AppleAccentColor");
InputStreamReader isr = new InputStreamReader(process.getInputStream());
BufferedReader rdr = new BufferedReader(isr);
String line;
while((line = rdr.readLine()) != null) {
colorKey = Integer.valueOf(line);
}
int rc = process.waitFor(); // Wait for the process to complete
if (0 == rc) {
return isDarkMode ? MACOS_ACCENT_COLOR_MAP.get(colorKey)[1] : MACOS_ACCENT_COLOR_MAP.get(colorKey)[0];
} else {
return isDarkMode ? MACOS_ACCENT_COLOR_MAP.get(4)[1] : MACOS_ACCENT_COLOR_MAP.get(4)[0];
}
} catch (IOException | InterruptedException e) {
return isDarkMode ? MACOS_ACCENT_COLOR_MAP.get(4)[1] : MACOS_ACCENT_COLOR_MAP.get(4)[0];
}
}
public static final OperatingSystem getOperatingSystem() {
String os = System.getProperty("os.name").toLowerCase();
if (os.indexOf("win") >= 0) {
return OperatingSystem.WINDOWS;
} else if (os.indexOf("mac") >= 0) {
return OperatingSystem.MACOS;
} else if (os.indexOf("nix") >= 0 || os.indexOf("nux") >= 0) {
return OperatingSystem.LINUX;
} else if (os.indexOf("sunos") >= 0) {
return OperatingSystem.SOLARIS;
} else {
return OperatingSystem.NONE;
}
}
// ******************** Internal Classes **********************************
static class StreamReader extends Thread {
private InputStream is;
private StringWriter sw;
StreamReader(InputStream is) {
this.is = is;
sw = new StringWriter();
}
public void run() {
try {
int c;
while ((c = is.read()) != -1)
sw.write(c);
} catch (IOException e) { ; }
}
String getResult() { return sw.toString(); }
}
}
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