Added GTK detection to SwingUtil (specific for checking if Swing has
already loaded GTK)
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@ -31,6 +31,7 @@ import java.awt.event.HierarchyListener;
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import java.awt.event.KeyEvent;
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import java.awt.event.WindowListener;
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import java.awt.image.BufferedImage;
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import java.lang.reflect.Field;
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import java.lang.reflect.InvocationTargetException;
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import java.util.Locale;
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@ -164,6 +165,64 @@ class SwingUtil {
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.equals(UIManager.getSystemLookAndFeelClassName());
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}
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/**
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* Checks to see if GTK is loaded by Swing, and if so - which version is loaded.
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*
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* @return the version of GTK loaded (if any) otherwise 0 for no version of GTK is loaded
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*/
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public static
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int getLoadedGtkVersion() {
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// is GTK already loaded by java?
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boolean isGtkAlreadyLoadedByJava = false;
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try {
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// Don't want to load the toolkit!!!
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Class<?> toolkitClass = Class.forName("java.awt.Toolkit");
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Field kitField = toolkitClass.getDeclaredField("toolkit");
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kitField.setAccessible(true);
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Object toolkit = kitField.get(null);
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if (toolkit != null) {
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Class<?> unixTkClazz = Class.forName("sun.awt.UNIXToolkit");
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if (unixTkClazz.isAssignableFrom(toolkit.getClass())) {
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Field field = unixTkClazz.getDeclaredField("nativeGTKLoaded");
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field.setAccessible(true);
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Boolean o = (Boolean) field.get(toolkit);
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if (o != null) {
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//noinspection UnnecessaryUnboxing
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isGtkAlreadyLoadedByJava = o.booleanValue();
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}
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}
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}
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} catch (Throwable ignored) {
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}
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if (isGtkAlreadyLoadedByJava) {
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// THIS IS NOT DOCUMENTED ANYWHERE...
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String swingGtkVersion = System.getProperty("swing.gtk.version");
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if (swingGtkVersion != null && swingGtkVersion.length() > 1) {
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char c = swingGtkVersion.charAt(0);
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if (MathUtil.isNumber(c)) {
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return (int) c;
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}
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}
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if (OS.javaVersion >= 9) {
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String property = System.getProperty("jdk.gtk.version", "2");
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if (property != null) {
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char c = property.charAt(0);
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if (MathUtil.isNumber(c)) {
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return (int) c;
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}
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}
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}
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// by default, this is the version GTK java uses (if none of the properties are set, but GTK is loaded)
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return 2;
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}
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return 0;
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}
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/** used when setting various icon components in the GUI to "nothing", since null doesn't work */
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public static final Image BLANK_ICON = new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB_PRE);
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