package org.eclipse.gmf.tooling.runtime.edit.policies.reparent;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.transaction.TransactionalEditingDomain;
import org.eclipse.emf.workspace.util.WorkspaceSynchronizer;
import org.eclipse.gmf.runtime.common.core.command.CommandResult;
import org.eclipse.gmf.runtime.diagram.core.preferences.PreferencesHint;
import org.eclipse.gmf.runtime.diagram.core.services.ViewService;
import org.eclipse.gmf.runtime.diagram.core.util.ViewUtil;
import org.eclipse.gmf.runtime.emf.commands.core.command.AbstractTransactionalCommand;
import org.eclipse.gmf.runtime.emf.core.util.EObjectAdapter;
import org.eclipse.gmf.runtime.notation.Edge;
import org.eclipse.gmf.runtime.notation.Node;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.gmf.tooling.runtime.structure.DiagramStructure;
public class MoveViewCommand extends AbstractTransactionalCommand {
private final IAdaptable myParent;
private final IAdaptable myChild;
private final int myIndex;
private final PreferencesHint myPreferences;
private DiagramStructure myDiagramStructure;
public MoveViewCommand(TransactionalEditingDomain editingDomain, IAdaptable parent, IAdaptable child, PreferencesHint preferencesHint) {
this(editingDomain, parent, child, ViewUtil.APPEND, preferencesHint);
}
public MoveViewCommand(TransactionalEditingDomain editingDomain, IAdaptable parent, IAdaptable child, int index, PreferencesHint preferences) {
super(editingDomain, "Move view", null);
myParent = parent;
myChild = child;
myIndex = index;
myPreferences = preferences;
}
public void setVisualIDRegistry(DiagramStructure diagramStructure) {
myDiagramStructure = diagramStructure;
}
@Override
public List<?> getAffectedFiles() {
View view = (View) myParent.getAdapter(View.class);
if (view != null) {
List<IFile> result = new ArrayList<IFile>();
IFile file = WorkspaceSynchronizer.getFile(view.eResource());
if (file != null) {
result.add(file);
}
return result;
}
return super.getAffectedFiles();
}
protected boolean checkCanMoveView(View parentView, View childView, EObject child) {
if (myDiagramStructure == null) {
return false;
}
int actualVisualId = myDiagramStructure.getVisualID(childView);
return myDiagramStructure.checkNodeVisualID(parentView, child, actualVisualId);
}
@Override
protected CommandResult doExecuteWithResult(IProgressMonitor monitor, IAdaptable info) throws ExecutionException {
View parentView = (View) myParent.getAdapter(View.class);
View childView = (View) myChild.getAdapter(View.class);
EObject child = childView.getElement();
if (child instanceof Edge) {
justMoveActualView(parentView, childView);
return CommandResult.newOKCommandResult();
}
if (checkCanMoveView(parentView, childView, child)) {
justMoveActualView(parentView, childView);
} else {
createNewView(parentView, childView, child);
}
return CommandResult.newOKCommandResult();
}
@SuppressWarnings("unchecked")
protected void moveStyles(View newViewWillBeIgnored, View oldChildViewWillBeReused) {
oldChildViewWillBeReused.getStyles().clear();
oldChildViewWillBeReused.getStyles().addAll(newViewWillBeIgnored.getStyles());
}
protected View basicCreateNewView(View parentView, View childView, EObject child) {
IAdaptable semanticAdapter = new EObjectAdapter(child);
String semanticHint = null;
View result = ViewService.getInstance().createView(//
Node.class, semanticAdapter, parentView, semanticHint, myIndex, true, myPreferences);
return result;
}
@SuppressWarnings("unchecked")
protected View createNewView(View parentView, View oldChildView, EObject child) {
// unfortunately, we have to reuse childView instance in order to allow
// command from layout edit policy to set correct bounds
// in order to do this, we will create the new view using service and
// then copy all its meaningfull contents
// into the original view instance
View newView = basicCreateNewView(parentView, oldChildView, child);
if (newView == null) {
return null;
}
removeViewFromContainer(newView);
justMoveActualView(parentView, oldChildView);
List<View> edgesToAndFromHierarchy = collectChildrenLinks(oldChildView, new ArrayList<View>());
oldChildView.getPersistedChildren().clear();
oldChildView.getTransientChildren().clear();
oldChildView.getSourceEdges().clear();
oldChildView.getTargetEdges().clear();
for (View childView : edgesToAndFromHierarchy) {
ViewUtil.destroy(childView);
}
moveStyles(newView, oldChildView);
oldChildView.getPersistedChildren().addAll(newView.getPersistedChildren());
oldChildView.getTransientChildren().addAll(newView.getTransientChildren());
oldChildView.getSourceEdges().addAll(newView.getSourceEdges());
oldChildView.getTargetEdges().addAll(newView.getTargetEdges());
oldChildView.setType(newView.getType());
return oldChildView;
}
@SuppressWarnings("unchecked")
private List<View> collectChildrenLinks(View view, List<View> output) {
output.addAll(view.getTargetEdges());
output.addAll(view.getSourceEdges());
for (Object child : view.getChildren()) {
if (child instanceof View) {
collectChildrenLinks((View) child, output);
}
}
return output;
}
private void justMoveActualView(View parentView, View childView) {
if (myIndex == ViewUtil.APPEND) {
parentView.insertChild(childView);
} else {
parentView.insertChildAt(childView, myIndex);
}
}
private void removeViewFromContainer(View view) {
if (view.eContainer() instanceof View) {
((View) view.eContainer()).removeChild(view);
}
}
}