import org.eclipse.gef.requests.AlignmentRequest; //导入依赖的package包/类
private Command createAlignmentCommand() {
    final AlignmentRequest request = new AlignmentRequest(RequestConstants.REQ_ALIGN);
    request.setAlignmentRectangle(calculateAlignmentRectangle(request));
    request.setAlignment(alignment);
    final List editparts = getOperationSet(request);
    if (editparts.size() < 2)
        return null;

    final CompoundCommand command = new CompoundCommand();
    command.setDebugLabel(getText());
    for (int i = 0; i < editparts.size(); i++) {
        final EditPart editpart = (EditPart) editparts.get(i);
        command.add(editpart.getCommand(request));
    }
    return command;
}
 

import org.eclipse.gef.requests.AlignmentRequest; //导入依赖的package包/类
private Command createAlignmentCommand() {
	AlignmentRequest request = new AlignmentRequest(
			RequestConstants.REQ_ALIGN);
	request.setAlignmentRectangle(calculateAlignmentRectangle(request));
	request.setAlignment(alignment);
	List editparts = getOperationSet(request);
	if (editparts.size() < 2)
		return null;

	CompoundCommand command = new CompoundCommand();
	command.setDebugLabel(getText());
	for (int i = 0; i < editparts.size(); i++) {
		EditPart editpart = (EditPart) editparts.get(i);
		command.add(editpart.getCommand(request));
	}
	return command;
}
 

import org.eclipse.gef.requests.AlignmentRequest; //导入依赖的package包/类
@Override
protected Object getConstraintFor(ChangeBoundsRequest request,
		GraphicalEditPart child) {

	if (request instanceof AlignmentRequest) {
		return super.getConstraintFor(request, child);
	}
	final Rectangle rect = (Rectangle) super.getConstraintFor(request,
			child);
	final Rectangle cons = getCurrentConstraintFor(child);
	final int newTreePosition = TreeLayoutUtil.getNewTreeNodePosition(
			request.getLocation(),
			TreeLayoutUtil.getSiblings((IGraphicalEditPart) child));
	if (cons instanceof TreeLayoutConstraint) {
		final TreeLayoutConstraint treeLayoutConstraint = (TreeLayoutConstraint) cons;
		return new TreeLayoutConstraint(rect,
				treeLayoutConstraint.isRoot(), newTreePosition);
	}
	return new TreeLayoutConstraint(rect, false, newTreePosition);
}
 

import org.eclipse.gef.requests.AlignmentRequest; //导入依赖的package包/类
private Command createAlignmentCommand() {
    final AlignmentRequest request = new AlignmentRequest(RequestConstants.REQ_ALIGN);
    request.setAlignmentRectangle(calculateAlignmentRectangle(request));
    request.setAlignment(alignment);
    final List<?> editparts = getOperationSet(request);
    if (editparts.size() < 2)
        return null;

    final CompoundCommand command = new CompoundCommand();
    command.setDebugLabel(getText());
    for (int i = 0; i < editparts.size(); i++) {
        final EditPart editpart = (EditPart) editparts.get(i);
        command.add(editpart.getCommand(request));
    }
    return command;
}
 

import org.eclipse.gef.requests.AlignmentRequest; //导入依赖的package包/类
@Override
public Command getCommand(Request request) {
	Object type = request.getType();
	if (!canMove()) {
		return null;
	}
	
	if (getHost()==null || getHost().getParent() == null) {
		// SPF-9135 NPE:  GEF 3.6 superclass will try to access  getHost().getParent().getCommand(req)
		return null;
	}

	if (REQ_MOVE.equals(type) && isDragAllowed())
		return getMoveCommand((ChangeBoundsRequest)request);
	if (REQ_MOVE_INITIATED.equals(type))
		return forwardToParent((ChangeBoundsRequest)request, REQ_MOVE_CHILDREN_INITIATED);
	if (REQ_MOVE_COMPLETED.equals(type))
		return forwardToParent((ChangeBoundsRequest)request, REQ_MOVE_CHILDREN_COMPLETED);
	if (REQ_ORPHAN.equals(type))
		return getOrphanCommand(request);
	if (REQ_ALIGN.equals(type))
		return getAlignCommand((AlignmentRequest)request);
	return null;
}
 

import org.eclipse.gef.requests.AlignmentRequest; //导入依赖的package包/类
/**
 * Factors out RESIZE and ALIGN requests, otherwise calls <code>super</code>
 * .
 * 
 * @see org.eclipse.gef.EditPolicy#getCommand(Request)
 */
public Command getCommand(Request request) {
	if (REQ_RESIZE_CHILDREN.equals(request.getType()))
		return getResizeChildrenCommand((ChangeBoundsRequest) request);
	if (REQ_ALIGN_CHILDREN.equals(request.getType()))
		return getAlignChildrenCommand((AlignmentRequest) request);

	return super.getCommand(request);
}
 

import org.eclipse.gef.requests.AlignmentRequest; //导入依赖的package包/类
/**
 * @see org.eclipse.gef.EditPolicy#getCommand(org.eclipse.gef.Request)
 */
public Command getCommand(Request request) {
	Object type = request.getType();

	if (REQ_MOVE.equals(type) && isDragAllowed())
		return getMoveCommand((ChangeBoundsRequest) request);
	if (REQ_ORPHAN.equals(type))
		return getOrphanCommand(request);
	if (REQ_ALIGN.equals(type))
		return getAlignCommand((AlignmentRequest) request);

	return null;
}
 

import org.eclipse.gef.requests.AlignmentRequest; //导入依赖的package包/类
/**
 * Returns the command contribution to an alignment request
 * 
 * @param request
 *            the alignment request
 * @return the contribution to the alignment
 */
protected Command getAlignCommand(AlignmentRequest request) {
	AlignmentRequest req = new AlignmentRequest(REQ_ALIGN_CHILDREN);
	req.setEditParts(getHost());
	req.setAlignment(request.getAlignment());
	req.setAlignmentRectangle(request.getAlignmentRectangle());
	return getHost().getParent().getCommand(req);
}
 

import org.eclipse.gef.requests.AlignmentRequest; //导入依赖的package包/类
/**
 * Returns the command to align a group of children. By default, this is
 * treated the same as a resize, and
 * {@link #getResizeChildrenCommand(ChangeBoundsRequest)} is returned.
 * 
 * @param request
 *            the AligmentRequest
 * @return the command to perform alignment
 */
protected Command getAlignChildrenCommand(AlignmentRequest request) {
	return getResizeChildrenCommand(request);
}