136 lines
3.9 KiB
Java
136 lines
3.9 KiB
Java
package dorkbox.swt;
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import java.lang.reflect.Method;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.util.Locale;
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import org.eclipse.swt.SWT;
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import org.eclipse.swt.widgets.Display;
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public
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class SwtAccess {
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private static Display currentDisplay = null;
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private static Thread currentDisplayThread = null;
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public static
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void init() {
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// we MUST save this on init, otherwise it is "null" when methods are run from the swing EDT.
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currentDisplay = org.eclipse.swt.widgets.Display.getCurrent();
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currentDisplayThread = currentDisplay.getThread();
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}
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static
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boolean isLoadable() {
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return org.eclipse.swt.SWT.isLoadable();
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}
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static
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void onShutdown(final org.eclipse.swt.widgets.Display currentDisplay, final Runnable runnable) {
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// currentDisplay.getShells() must only be called inside the event thread!
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org.eclipse.swt.widgets.Shell shell = currentDisplay.getShells()[0];
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shell.addListener(org.eclipse.swt.SWT.Close, new org.eclipse.swt.widgets.Listener() {
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@Override
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public
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void handleEvent(final org.eclipse.swt.widgets.Event event) {
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runnable.run();
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}
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});
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}
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static
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int getVersion() {
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return SWT.getVersion();
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}
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/**
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* This is only necessary for linux.
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*
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* @return true if SWT is GTK3. False if SWT is GTK2. If for some reason we DO NOT KNOW, then we return false (GTK2).
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*/
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static boolean isGtk3() {
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boolean isLinux = System.getProperty("os.name", "").toLowerCase(Locale.US).startsWith("linux");
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if (!isLinux) {
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return false;
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}
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// required to use reflection, because this is an internal class!
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final String SWT_INTERNAL_CLASS = "org.eclipse.swt.internal.gtk.OS";
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Class<?> osClass = AccessController.doPrivileged(new PrivilegedAction<Class<?>>() {
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@Override
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public
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Class<?> run() {
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try {
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return Class.forName(SWT_INTERNAL_CLASS, true, ClassLoader.getSystemClassLoader());
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} catch (Exception ignored) {
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}
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try {
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return Class.forName(SWT_INTERNAL_CLASS, true, Thread.currentThread().getContextClassLoader());
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} catch (Exception ignored) {
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}
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return null;
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}
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});
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if (osClass == null) {
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return false;
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}
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final Class<?> clazz = osClass;
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Method method = AccessController.doPrivileged(new PrivilegedAction<Method>() {
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@Override
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public
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Method run() {
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try {
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return clazz.getMethod("gtk_major_version");
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} catch (Exception e) {
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return null;
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}
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}
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});
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if (method == null) {
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return false;
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}
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int version = 0;
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try {
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version = ((Number)method.invoke(osClass)).intValue();
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} catch (Exception ignored) {
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// this method doesn't exist.
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}
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return version == 3;
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}
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static
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void dispatch(final Runnable runnable) {
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currentDisplay.syncExec(runnable);
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}
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static
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boolean isEventThread() {
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return Thread.currentThread() == currentDisplayThread;
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}
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static
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void onShutdown(final Runnable runnable) {
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// currentDisplay.getShells() must only be called inside the event thread!
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if (isEventThread()) {
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SwtAccess.onShutdown(currentDisplay, runnable);
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} else {
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dispatch(new Runnable() {
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@Override
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public
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void run() {
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SwtAccess.onShutdown(currentDisplay, runnable);
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}
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});
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}
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}
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}
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