Move WaitCallback and WaitRunnable to forge-gui

forge-gui/src/main/java/forge/util/WaitCallback.java

@@ -0,0 +1,34 @@
+package forge.util;
+
+import forge.FThreads;
+
+public abstract class WaitCallback<T> extends Callback<T> implements Runnable {
+    public class Lock {
+    }
+
+    private final Lock lock = new Lock();
+
+    private T result;
+
+    @Override
+    public final void run(T result0) {
+        result = result0;
+        synchronized (lock) {
+            lock.notify();
+        }
+    }
+
+    public final T invokeAndWait() {
+        FThreads.assertExecutedByEdt(false); //not supported if on UI thread
+        FThreads.invokeInEdtLater(this);
+        try {
+            synchronized (lock) {
+                lock.wait();
+            }
+        }
+        catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+        return result;
+    }
+}

forge-gui/src/main/java/forge/util/WaitRunnable.java

@@ -0,0 +1,31 @@
+package forge.util;
+
+import forge.FThreads;
+
+public abstract class WaitRunnable implements Runnable {
+    public class Lock {
+    }
+
+    private final Lock lock = new Lock();
+
+    public void invokeAndWait() {
+        FThreads.assertExecutedByEdt(false); //not supported if on UI thread
+        FThreads.invokeInEdtLater(new Runnable() {
+            @Override
+            public void run() {
+                WaitRunnable.this.run();
+                synchronized(lock) {
+                    lock.notify();
+                }
+            }
+        });
+        try {
+            synchronized(lock) {
+                lock.wait();
+            }
+        }
+        catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+}