Adds some owner related methods to standard dialog

Fixes issue 2670: AED is all broken on OS X

Change-Id: I54a7e22aa1497b3ec69d3e48b6f39b0bd5098bf3
Reviewed-on: http://gerrit.dmdirc.com/524
Automatic-Compile: Chris Smith <chris@dmdirc.com>
Reviewed-by: Chris Smith <chris@dmdirc.com>

src/com/dmdirc/addons/ui_swing/dialogs/StandardDialog.java

@@ -117,13 +117,30 @@ public class StandardDialog extends JDialog {
             }
         });
         pack();
+        centreOnOwner();
+        setVisible(false);
+        setVisible(true);
+    }
+
+
+    /**
+     * Centres this dialog on its owner, or the screen if no owner is present.
+     */
+    public void centreOnOwner() {
         if (owner == null) {
             CoreUIUtils.centreWindow(this);
         } else {
             setLocationRelativeTo(owner);
         }
-        setVisible(false);
-        setVisible(true);
+    }
+
+    /**
+     * Returns the window owner for this dialog.
+     *
+     * @return Parent window or null
+     */
+    public Window getOwner() {
+        return owner;
     }
 
     /**

src/com/dmdirc/addons/ui_swing/dialogs/actioneditor/ActionEditorDialog.java

@@ -24,6 +24,7 @@ package com.dmdirc.addons.ui_swing.dialogs.actioneditor;
 
 import com.dmdirc.actions.Action;
 import com.dmdirc.addons.ui_swing.dialogs.StandardDialog;
+import com.dmdirc.ui.CoreUIUtils;
 
 import java.awt.Dimension;
 import java.awt.Window;
@@ -256,6 +257,14 @@ public class ActionEditorDialog extends StandardDialog implements ActionListener
         }
     }
 
+    /** {@inheritDoc} */
+    @Override
+    public void validate() {
+        super.validate();
+        
+        centreOnOwner();
+    }
+
     /** Saves the action being edited. */
     private void save() {
         name.getActionName();