platform/core.multiview/src/org/netbeans/core/multiview/MultiViewCloneableTopComponent.java - netbeans - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
  * distributed with this work for additional information
  * regarding copyright ownership.  The ASF licenses this file
  * to you under the Apache License, Version 2.0 (the
  * "License"); you may not use this file except in compliance
  * with the License.  You may obtain a copy of the License at
  *
  *   http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing,
  * software distributed under the License is distributed on an
  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  * KIND, either express or implied.  See the License for the
  * specific language governing permissions and limitations
  * under the License.
  */

 package org.netbeans.core.multiview;

 import java.io.*;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.logging.Logger;
 import javax.swing.Action;
 import javax.swing.SwingUtilities;
 import org.netbeans.core.multiview.MultiViewModel.ActionRequestObserverFactory;
 import org.netbeans.core.spi.multiview.CloseOperationHandler;
 import org.netbeans.core.spi.multiview.MultiViewDescription;
 import org.netbeans.core.spi.multiview.MultiViewElement;
 import org.netbeans.core.spi.multiview.MultiViewElementCallback;
 import org.netbeans.core.spi.multiview.SourceViewMarker;
 import org.openide.awt.UndoRedo;
 import org.openide.text.CloneableEditorSupport;
 import org.openide.util.HelpCtx;
 import org.openide.util.Lookup;
 import org.openide.windows.CloneableTopComponent;
 import org.openide.windows.TopComponent;


 /** Special subclass of TopComponent which shows and handles set of
  * MultiViewElements, shows them in switchable toggle buttons style, along
  * with toolbars and actions associated with individual view elements.
  *
  *
  * @author Dafe Simonek, Milos Kleint
  */


 public final class MultiViewCloneableTopComponent extends CloneableTopComponent
                                                   implements ActionRequestObserverFactory,
                                                              CloneableEditorSupport.Pane,
                                                              Splitable {

     MultiViewPeer peer;

     public MultiViewCloneableTopComponent() {
         super();
         peer = new MultiViewPeer(this, this);
         // initializes the multiview component.
         peer.initComponents();
         setFocusCycleRoot(false);
         setName("");
         // assocuate lookup needs to come after the init.. initComponents() initializes actionMap
         associateLookup(peer.getLookup());

 //        setFocusable(false);
     }

     public <T extends Serializable & Lookup.Provider> void setMimeLookup(String mimeType, T context) {
         peer.setMimeLookup(mimeType, context);
     }

     public void setMultiViewDescriptions(MultiViewDescription[] descriptions, MultiViewDescription defaultDesc) {
         peer.setMultiViewDescriptions(descriptions, defaultDesc);
     }

     public void setCloseOperationHandler(CloseOperationHandler handler) {
         peer.setCloseOperationHandler(handler);
     }

     private void setDeserializedMultiViewDescriptions(MultiViewDescription[] descriptions,
                                                       MultiViewDescription defaultDesc, Map existingElements) {
         peer.setDeserializedMultiViewDescriptions(-1, descriptions, defaultDesc, null, existingElements);
     }

     MultiViewModel getModel() {
         return peer.getModel();
     }

     @Override
     public Lookup getLookup() {
         peer.assignLookup((MultiViewTopComponentLookup)super.getLookup());
         return super.getLookup();
     }

     protected void componentClosed() {
         super.componentClosed();
         peer.peerComponentClosed();
     }

     protected void componentShowing() {
         super.componentShowing();
         peer.peerComponentShowing();
     }

     protected void componentHidden() {
         super.componentHidden();
         peer.peerComponentHidden();
     }

     protected void componentDeactivated() {
         super.componentDeactivated();
         peer.peerComponentDeactivated();
     }

     protected void componentActivated() {
         super.componentActivated();
         peer.peerComponentActivated();
     }

     protected void componentOpened() {
         super.componentOpened();
         peer.peerComponentOpened();
     }

     /**
      * delegate to the apppropriate active element's component
      */
     public boolean requestFocusInWindow() {
         return peer.requestFocusInWindow();
     }

     /**
      * delegate to the apppropriate active element's component
      */
     public void requestFocus() {
         peer.requestFocus();
     }

     /**
      * merge action for the topcomponent and the enclosed MultiViewElement..
      *
      */
     @Override
     public Action[] getActions() {
         //TEMP don't delegate to element's actions..
         Action[] superActions = super.getActions();
         List<Action> acts = new ArrayList<Action>(Arrays.asList(peer.peerGetActions(superActions)));

         if( !acts.isEmpty() )
             acts.add(null);
         acts.add( new EditorsAction() );
         if( canSplit() ) {
             acts.add( new SplitAction(true) );
         }
         return acts.toArray(new Action[acts.size()]);
     }

     @Override
     public boolean canSplit() {
         return null != peer.model && peer.model.canSplit();
     }

     public MultiViewHandlerDelegate getMultiViewHandlerDelegate() {
         // TODO have one handler only or create a new one each time?
         return peer.getMultiViewHandlerDelegate();
     }

     /**
      * Delegates the value to the element descriptions.
      */
     public int getPersistenceType() {
         return peer.getPersistenceType();
     }

     protected String preferredID() {
         return peer.preferredID();
     }

     @Override
     protected CloneableTopComponent createClonedObject() {
         MultiViewCloneableTopComponent tc = new MultiViewCloneableTopComponent();
 	tc.setMultiViewDescriptions(peer.model.getDescriptions(), getActiveDescription());
         tc.setCloseOperationHandler(peer.closeHandler);
         tc.peer.copyMimeContext(peer);
 	if(getSplitOrientation() != -1) {
 	    tc.splitComponent(getSplitOrientation(), -1);
 	    tc.updateName();
 	}
         return tc;
     }

     private MultiViewDescription getActiveDescription() {
 	int splitOrientation = getSplitOrientation();
 	MultiViewDescription activeDescription = peer.model.getActiveDescription();
 	if (splitOrientation != -1) {
 	    boolean isSplitDescription = false;
 	    if (activeDescription instanceof ContextAwareDescription) {
 		isSplitDescription = ((ContextAwareDescription) activeDescription).isSplitDescription();
 	    }
 	    if (isSplitDescription) {
 		for (MultiViewDescription descr : peer.model.getDescriptions()) {
 		    if (descr.getDisplayName().equals(activeDescription.getDisplayName())) {
 			activeDescription = descr;
 			break;
 		    }
 		}
 	    }
 	}
 	return activeDescription;
     }

     @Override
     public TopComponent splitComponent(int orientation, int splitPosition) {
 	peer.peerSplitComponent(orientation, splitPosition);
 	return this;
     }

     @Override
     public TopComponent clearSplit(int splitElementToActivate) {
 	peer.peerClearSplit(splitElementToActivate);
 	return this;
     }

     @Override
     public int getSplitOrientation() {
 	return peer.getSplitOrientation();
     }

     /** Serialize this top component.
     * Subclasses wishing to store state must call the super method, then write to the stream.
     * @param out the stream to serialize to
     */
     public void writeExternal (ObjectOutput out) throws IOException {
         super.writeExternal(out);
         peer.peerWriteExternal(out);
     }

     /** Deserialize this top component.
     * Subclasses wishing to store state must call the super method, then read from the stream.
     * @param in the stream to deserialize from
     */
     public void readExternal (ObjectInput in) throws IOException, ClassNotFoundException {
         super.readExternal(in);
         peer.peerReadExternal(in);
     }


     Action[] getDefaultTCActions() {
         return super.getActions();
     }

     public MultiViewElementCallback createElementCallback(MultiViewDescription desc) {
         return SpiAccessor.DEFAULT.createCallback(new ActReqObserver(desc));
     }

     public CloneableTopComponent getComponent() {
         return this;
     }

     public javax.swing.JEditorPane getEditorPane() {
         if (peer == null || peer.model == null) {
             return null;
         }
         MultiViewElement paneEl = findPaneElement();
         if (paneEl != null) {
             CloneableEditorSupport.Pane pane = (CloneableEditorSupport.Pane)paneEl.getVisualRepresentation();
             return pane.getEditorPane();
         }
         // hopeless case, don't try to create new elements. it's users responsibility to
         // switch to the editor element before getEditorPane()
         return null;
     }

     private MultiViewElement findPaneElement() {
         MultiViewElement el = peer.model.getActiveElement(false);
         if (el != null && el.getVisualRepresentation() instanceof CloneableEditorSupport.Pane) {
             return el;
         }
         // now try a best guess.. iterate the already created elements and check if any of
         // them is a Pane
         Collection<MultiViewElement> col = peer.model.getCreatedElements();
         Iterator<MultiViewElement> it = col.iterator();
         while (it.hasNext()) {
             el = it.next();
             if (el.getVisualRepresentation() instanceof CloneableEditorSupport.Pane) {
                 // fingers crossed and hope for the best... could result in bad results once
                 // we have multiple editors in the multiview component.
                 return el;
             }
         }

         MultiViewDescription[] descs = peer.model.getDescriptions();
         for (MultiViewDescription desc : descs) {
             if (isSourceView(desc)) {
                 el = peer.model.getElementForDescription(desc);
                 if (el.getVisualRepresentation() instanceof CloneableEditorSupport.Pane) {
                     return el;
                 } else {
                     Logger.getLogger(getClass().getName()).info("MultiViewDescription " + desc.getDisplayName() + "(" + desc.getClass() +
                             ") claimed to contain sources, but it's MutliViewElement.getVisualRepresentation() didn't return a valid CloeanbleEditorSupport.Pane instance.");
                 }
             }
         }
         // hopeless case, don't try to create new elements. it's users responsibility to
         // switch to the editor element before getEditorPane()
         return null;
     }

     public HelpCtx getHelpCtx() {
         return peer.getHelpCtx();
     }

     public String toString() {
         return "MVCTC[name=" + getDisplayName() + ", peer=" + peer + "]"; // NOI18N
     }

     /**
      * Get the undo/redo support for this component.
      * The default implementation returns a dummy support that cannot
      * undo anything.
      *
      * @return undoable edit for this component
      */
     public UndoRedo getUndoRedo() {
         UndoRedo retValue;
         retValue = peer.peerGetUndoRedo();
         if (retValue == null) {
             retValue = super.getUndoRedo();
         }
         return retValue;
     }

     /**
      * This method is called when last <code>CloneableTopComponent</code> is about to close.
      * Delegates to CloseOperationHandler.
      */
     @Override
     protected boolean closeLast() {
         return peer.canClose();
     }

     // from CloneableEditor.Pane
     public void updateName() {
         // ensure to trigger update name from AWT -> #44012 - will ultimately trigger winsys.
         if (peer != null) {
             if (SwingUtilities.isEventDispatchThread() ) {
                 peer.updateName();
             } else {
                 SwingUtilities.invokeLater(new Runnable() {
                     public void run() {
                         peer.updateName();
                     }
                 });
             }
         }
     }

     /**
      * callback for the Pane implementation to adjust itself to the openAt() request.
      */
     public void ensureVisible() {
         MultiViewElement paneEl = findPaneElement();
         if (paneEl != null) {
             open();
             MultiViewElementCallback call = peer.getModel().getCallbackForElement(paneEl);
             call.requestVisible();
         }
     }

     static boolean isSourceView(MultiViewDescription desc) {
         if (desc instanceof SourceViewMarker) {
             return true;
         }
         if (desc instanceof SourceCheckDescription) {
             return ((SourceCheckDescription)desc).isSourceView();
         }
         return false;
     }

     @Override
     public SubComponent[] getSubComponents() {
         return MultiViewTopComponent.getSubComponents( peer );
     }

     /**
      * implementation of the MultiViewElement.ActionRequestObserver, manages activatation of the elements
      * and the TC itself based on requests from the elements.
      */
     class ActReqObserver implements Serializable, MultiViewElementCallbackDelegate {

         private static final long serialVersionUID =-3126744916624172415L;
         private MultiViewDescription description;

         ActReqObserver(MultiViewDescription desc) {
             description = desc;
         }

         public void requestActive() {
             boolean activated = peer.isActivated();
             if (!activated) {
                 MultiViewCloneableTopComponent.this.requestActive();
             }
             if (peer.model.getActiveDescription() != description) {
                 if (activated) {
                     peer.model.getActiveElement().componentDeactivated();
                 }
                 peer.tabs.changeActiveManually(description);
                 if (activated) {
                     peer.model.getActiveElement().componentActivated();
                 }
             }

         }

         public void requestVisible() {
             peer.tabs.changeVisibleManually(description);
         }

         public Action[] createDefaultActions() {
             return MultiViewCloneableTopComponent.this.getDefaultTCActions();
         }

         public void updateTitle(String title) {
             MultiViewCloneableTopComponent.this.setDisplayName(title);
         }

         /** replace as null - should not be stored and read..*/
         public Object writeReplace() throws ObjectStreamException {
             return null;
         }

         /** Resolve as null -should not be stored and read..*/
         public Object readResolve() throws ObjectStreamException {
             return null;
         }

         public boolean isSelectedElement() {
             return (description.equals(peer.model.getActiveDescription()));
         }

         public TopComponent getTopComponent() {
             return MultiViewCloneableTopComponent.this;
         }

     }

 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one
	* or more contributor license agreements. See the NOTICE file
	* distributed with this work for additional information
	* regarding copyright ownership. The ASF licenses this file
	* to you under the Apache License, Version 2.0 (the
	* "License"); you may not use this file except in compliance
	* with the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing,
	* software distributed under the License is distributed on an
	* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
	* KIND, either express or implied. See the License for the
	* specific language governing permissions and limitations
	* under the License.
	*/

	package org.netbeans.core.multiview;

	import java.io.*;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.Collection;
	import java.util.Iterator;
	import java.util.List;
	import java.util.Map;
	import java.util.logging.Logger;
	import javax.swing.Action;
	import javax.swing.SwingUtilities;
	import org.netbeans.core.multiview.MultiViewModel.ActionRequestObserverFactory;
	import org.netbeans.core.spi.multiview.CloseOperationHandler;
	import org.netbeans.core.spi.multiview.MultiViewDescription;
	import org.netbeans.core.spi.multiview.MultiViewElement;
	import org.netbeans.core.spi.multiview.MultiViewElementCallback;
	import org.netbeans.core.spi.multiview.SourceViewMarker;
	import org.openide.awt.UndoRedo;
	import org.openide.text.CloneableEditorSupport;
	import org.openide.util.HelpCtx;
	import org.openide.util.Lookup;
	import org.openide.windows.CloneableTopComponent;
	import org.openide.windows.TopComponent;


	/** Special subclass of TopComponent which shows and handles set of
	* MultiViewElements, shows them in switchable toggle buttons style, along
	* with toolbars and actions associated with individual view elements.
	*
	*
	* @author Dafe Simonek, Milos Kleint
	*/


	public final class MultiViewCloneableTopComponent extends CloneableTopComponent
	implements ActionRequestObserverFactory,
	CloneableEditorSupport.Pane,
	Splitable {

	MultiViewPeer peer;

	public MultiViewCloneableTopComponent() {
	super();
	peer = new MultiViewPeer(this, this);
	// initializes the multiview component.
	peer.initComponents();
	setFocusCycleRoot(false);
	setName("");
	// assocuate lookup needs to come after the init.. initComponents() initializes actionMap
	associateLookup(peer.getLookup());

	// setFocusable(false);
	}

	public <T extends Serializable & Lookup.Provider> void setMimeLookup(String mimeType, T context) {
	peer.setMimeLookup(mimeType, context);
	}

	public void setMultiViewDescriptions(MultiViewDescription[] descriptions, MultiViewDescription defaultDesc) {
	peer.setMultiViewDescriptions(descriptions, defaultDesc);
	}

	public void setCloseOperationHandler(CloseOperationHandler handler) {
	peer.setCloseOperationHandler(handler);
	}

	private void setDeserializedMultiViewDescriptions(MultiViewDescription[] descriptions,
	MultiViewDescription defaultDesc, Map existingElements) {
	peer.setDeserializedMultiViewDescriptions(-1, descriptions, defaultDesc, null, existingElements);
	}

	MultiViewModel getModel() {
	return peer.getModel();
	}

	@Override
	public Lookup getLookup() {
	peer.assignLookup((MultiViewTopComponentLookup)super.getLookup());
	return super.getLookup();
	}

	protected void componentClosed() {
	super.componentClosed();
	peer.peerComponentClosed();
	}

	protected void componentShowing() {
	super.componentShowing();
	peer.peerComponentShowing();
	}

	protected void componentHidden() {
	super.componentHidden();
	peer.peerComponentHidden();
	}

	protected void componentDeactivated() {
	super.componentDeactivated();
	peer.peerComponentDeactivated();
	}

	protected void componentActivated() {
	super.componentActivated();
	peer.peerComponentActivated();
	}

	protected void componentOpened() {
	super.componentOpened();
	peer.peerComponentOpened();
	}

	/**
	* delegate to the apppropriate active element's component
	*/
	public boolean requestFocusInWindow() {
	return peer.requestFocusInWindow();
	}

	/**
	* delegate to the apppropriate active element's component
	*/
	public void requestFocus() {
	peer.requestFocus();
	}

	/**
	* merge action for the topcomponent and the enclosed MultiViewElement..
	*
	*/
	@Override
	public Action[] getActions() {
	//TEMP don't delegate to element's actions..
	Action[] superActions = super.getActions();
	List<Action> acts = new ArrayList<Action>(Arrays.asList(peer.peerGetActions(superActions)));

	if( !acts.isEmpty() )
	acts.add(null);
	acts.add( new EditorsAction() );
	if( canSplit() ) {
	acts.add( new SplitAction(true) );
	}
	return acts.toArray(new Action[acts.size()]);
	}

	@Override
	public boolean canSplit() {
	return null != peer.model && peer.model.canSplit();
	}

	public MultiViewHandlerDelegate getMultiViewHandlerDelegate() {
	// TODO have one handler only or create a new one each time?
	return peer.getMultiViewHandlerDelegate();
	}

	/**
	* Delegates the value to the element descriptions.
	*/
	public int getPersistenceType() {
	return peer.getPersistenceType();
	}

	protected String preferredID() {
	return peer.preferredID();
	}

	@Override
	protected CloneableTopComponent createClonedObject() {
	MultiViewCloneableTopComponent tc = new MultiViewCloneableTopComponent();
	tc.setMultiViewDescriptions(peer.model.getDescriptions(), getActiveDescription());
	tc.setCloseOperationHandler(peer.closeHandler);
	tc.peer.copyMimeContext(peer);
	if(getSplitOrientation() != -1) {
	tc.splitComponent(getSplitOrientation(), -1);
	tc.updateName();
	}
	return tc;
	}

	private MultiViewDescription getActiveDescription() {
	int splitOrientation = getSplitOrientation();
	MultiViewDescription activeDescription = peer.model.getActiveDescription();
	if (splitOrientation != -1) {
	boolean isSplitDescription = false;
	if (activeDescription instanceof ContextAwareDescription) {
	isSplitDescription = ((ContextAwareDescription) activeDescription).isSplitDescription();
	}
	if (isSplitDescription) {
	for (MultiViewDescription descr : peer.model.getDescriptions()) {
	if (descr.getDisplayName().equals(activeDescription.getDisplayName())) {
	activeDescription = descr;
	break;
	}
	}
	}
	}
	return activeDescription;
	}

	@Override
	public TopComponent splitComponent(int orientation, int splitPosition) {
	peer.peerSplitComponent(orientation, splitPosition);
	return this;
	}

	@Override
	public TopComponent clearSplit(int splitElementToActivate) {
	peer.peerClearSplit(splitElementToActivate);
	return this;
	}

	@Override
	public int getSplitOrientation() {
	return peer.getSplitOrientation();
	}

	/** Serialize this top component.
	* Subclasses wishing to store state must call the super method, then write to the stream.
	* @param out the stream to serialize to
	*/
	public void writeExternal (ObjectOutput out) throws IOException {
	super.writeExternal(out);
	peer.peerWriteExternal(out);
	}

	/** Deserialize this top component.
	* Subclasses wishing to store state must call the super method, then read from the stream.
	* @param in the stream to deserialize from
	*/
	public void readExternal (ObjectInput in) throws IOException, ClassNotFoundException {
	super.readExternal(in);
	peer.peerReadExternal(in);
	}


	Action[] getDefaultTCActions() {
	return super.getActions();
	}

	public MultiViewElementCallback createElementCallback(MultiViewDescription desc) {
	return SpiAccessor.DEFAULT.createCallback(new ActReqObserver(desc));
	}

	public CloneableTopComponent getComponent() {
	return this;
	}

	public javax.swing.JEditorPane getEditorPane() {
	if (peer == null \|\| peer.model == null) {
	return null;
	}
	MultiViewElement paneEl = findPaneElement();
	if (paneEl != null) {
	CloneableEditorSupport.Pane pane = (CloneableEditorSupport.Pane)paneEl.getVisualRepresentation();
	return pane.getEditorPane();
	}
	// hopeless case, don't try to create new elements. it's users responsibility to
	// switch to the editor element before getEditorPane()
	return null;
	}

	private MultiViewElement findPaneElement() {
	MultiViewElement el = peer.model.getActiveElement(false);
	if (el != null && el.getVisualRepresentation() instanceof CloneableEditorSupport.Pane) {
	return el;
	}
	// now try a best guess.. iterate the already created elements and check if any of
	// them is a Pane
	Collection<MultiViewElement> col = peer.model.getCreatedElements();
	Iterator<MultiViewElement> it = col.iterator();
	while (it.hasNext()) {
	el = it.next();
	if (el.getVisualRepresentation() instanceof CloneableEditorSupport.Pane) {
	// fingers crossed and hope for the best... could result in bad results once
	// we have multiple editors in the multiview component.
	return el;
	}
	}

	MultiViewDescription[] descs = peer.model.getDescriptions();
	for (MultiViewDescription desc : descs) {
	if (isSourceView(desc)) {
	el = peer.model.getElementForDescription(desc);
	if (el.getVisualRepresentation() instanceof CloneableEditorSupport.Pane) {
	return el;
	} else {
	Logger.getLogger(getClass().getName()).info("MultiViewDescription " + desc.getDisplayName() + "(" + desc.getClass() +
	") claimed to contain sources, but it's MutliViewElement.getVisualRepresentation() didn't return a valid CloeanbleEditorSupport.Pane instance.");
	}
	}
	}
	// hopeless case, don't try to create new elements. it's users responsibility to
	// switch to the editor element before getEditorPane()
	return null;
	}

	public HelpCtx getHelpCtx() {
	return peer.getHelpCtx();
	}

	public String toString() {
	return "MVCTC[name=" + getDisplayName() + ", peer=" + peer + "]"; // NOI18N
	}

	/**
	* Get the undo/redo support for this component.
	* The default implementation returns a dummy support that cannot
	* undo anything.
	*
	* @return undoable edit for this component
	*/
	public UndoRedo getUndoRedo() {
	UndoRedo retValue;
	retValue = peer.peerGetUndoRedo();
	if (retValue == null) {
	retValue = super.getUndoRedo();
	}
	return retValue;
	}

	/**
	* This method is called when last <code>CloneableTopComponent</code> is about to close.
	* Delegates to CloseOperationHandler.
	*/
	@Override
	protected boolean closeLast() {
	return peer.canClose();
	}

	// from CloneableEditor.Pane
	public void updateName() {
	// ensure to trigger update name from AWT -> #44012 - will ultimately trigger winsys.
	if (peer != null) {
	if (SwingUtilities.isEventDispatchThread() ) {
	peer.updateName();
	} else {
	SwingUtilities.invokeLater(new Runnable() {
	public void run() {
	peer.updateName();
	}
	});
	}
	}
	}

	/**
	* callback for the Pane implementation to adjust itself to the openAt() request.
	*/
	public void ensureVisible() {
	MultiViewElement paneEl = findPaneElement();
	if (paneEl != null) {
	open();
	MultiViewElementCallback call = peer.getModel().getCallbackForElement(paneEl);
	call.requestVisible();
	}
	}

	static boolean isSourceView(MultiViewDescription desc) {
	if (desc instanceof SourceViewMarker) {
	return true;
	}
	if (desc instanceof SourceCheckDescription) {
	return ((SourceCheckDescription)desc).isSourceView();
	}
	return false;
	}

	@Override
	public SubComponent[] getSubComponents() {
	return MultiViewTopComponent.getSubComponents( peer );
	}

	/**
	* implementation of the MultiViewElement.ActionRequestObserver, manages activatation of the elements
	* and the TC itself based on requests from the elements.
	*/
	class ActReqObserver implements Serializable, MultiViewElementCallbackDelegate {

	private static final long serialVersionUID =-3126744916624172415L;
	private MultiViewDescription description;

	ActReqObserver(MultiViewDescription desc) {
	description = desc;
	}

	public void requestActive() {
	boolean activated = peer.isActivated();
	if (!activated) {
	MultiViewCloneableTopComponent.this.requestActive();
	}
	if (peer.model.getActiveDescription() != description) {
	if (activated) {
	peer.model.getActiveElement().componentDeactivated();
	}
	peer.tabs.changeActiveManually(description);
	if (activated) {
	peer.model.getActiveElement().componentActivated();
	}
	}

	}

	public void requestVisible() {
	peer.tabs.changeVisibleManually(description);
	}

	public Action[] createDefaultActions() {
	return MultiViewCloneableTopComponent.this.getDefaultTCActions();
	}

	public void updateTitle(String title) {
	MultiViewCloneableTopComponent.this.setDisplayName(title);
	}

	/** replace as null - should not be stored and read..*/
	public Object writeReplace() throws ObjectStreamException {
	return null;
	}

	/** Resolve as null -should not be stored and read..*/
	public Object readResolve() throws ObjectStreamException {
	return null;
	}

	public boolean isSelectedElement() {
	return (description.equals(peer.model.getActiveDescription()));
	}

	public TopComponent getTopComponent() {
	return MultiViewCloneableTopComponent.this;
	}

	}

	}