--- /dev/null
+package jalview.ext.treeviewer;
+
+import java.awt.Container;
+import java.awt.Dimension;
+import java.awt.MenuContainer;
+import java.awt.image.ImageObserver;
+
+import javax.accessibility.Accessible;
+import javax.swing.RootPaneContainer;
+import javax.swing.WindowConstants;
+import javax.swing.event.InternalFrameListener;
+
+/**
+ * Interface for implementing the (probably) top level frame of an external tree
+ * viewer. Note that this extends many interfaces shared with Swing frames but
+ * doesn't demand that an implementation actually is a Swing frame.
+ *
+ * Frames should be added to Jalview's desktop via
+ * {@link TreeViewerUtils#addTreeViewFrameToJalview(TreeFrameI)} to ensure that
+ * they are registered as an active tree view.
+ *
+ * @author kjvanderheide
+ *
+ */
+public interface TreeFrameI
+ extends Accessible, WindowConstants, RootPaneContainer,
+ ImageObserver, MenuContainer
+{
+ public void addFrameListener(InternalFrameListener listener);
+
+ /**
+ * Method for adding the actual frame to Jalview, probably by calling
+ * {@link jalview.gui.Desktop#addInternalFrame(javax.swing.JInternalFrame, String, boolean, int, int, boolean, boolean)}
+ *
+ * @param title
+ * @param makeVisible
+ * @param width
+ * @param height
+ * @param resizable
+ * @param ignoreMinSize
+ */
+ public void addFrameToJalview(String title, boolean makeVisible,
+ int width, int height, boolean resizable, boolean ignoreMinSize);
+
+ /**
+ * If the tree viewer used supports multiple trees in one frame this method
+ * should perform the needed adaptations.
+ */
+ public abstract void enableMultipleTrees();
+
+ public InternalFrameListener[] getFrameListeners();
+
+ public abstract int getNumberOfTrees();
+
+ public Container getTopLevelAncestor();
+
+ public abstract TreeI getTree();
+
+ public TreeControlsI getTreeControls();
+
+ public abstract TreePanelI getTreePanel();
+
+ public TreeViewerBindingI getViewBinding();
+
+ public boolean isShowing();
+
+ public void removeFrameListener(InternalFrameListener listener);
+
+ /**
+ * @see java.awt.Component#repaint()
+ */
+ public void repaint();
+
+ public void setMaximumSize(Dimension maximumSize);
+
+ public void setMinimumSize(Dimension minimumSize);
+
+ public void setPreferredSize(Dimension preferredSize);
+
+ public void setViewBinding(TreeViewerBindingI alignmentBinding);
+
+}