Java Handle类代码示例

import org.eclipse.gef.Handle; //导入依赖的package包/类
@Override
protected void createDefaultEditPolicies() {
	super.createDefaultEditPolicies();
	installEditPolicy(EditPolicy.COMPONENT_ROLE, new TransitionExpressionComponentEditPolicy());
	installEditPolicy(EditPolicy.SELECTION_FEEDBACK_ROLE, new ContextSensitiveHelpPolicy(
			HelpContextIds.SC_PROPERTIES_TRANSITION_EXPRESSION));
	// BUGFIX:
	// https://code.google.com/a/eclipselabs.org/p/yakindu/issues/detail?id=26
	installEditPolicy(EditPolicy.PRIMARY_DRAG_ROLE, new NonResizableLabelEditPolicy() {
		@Override
		protected void replaceHandleDragEditPartsTracker(Handle handle) {
			if (handle instanceof AbstractHandle) {
				AbstractHandle h = (AbstractHandle) handle;
				h.setDragTracker(new DragEditPartsTrackerEx(getHost()) {
					protected boolean isMove() {
						return true;
					};
				});
			}
		}
	});
}
 

import org.eclipse.gef.Handle; //导入依赖的package包/类
/**
 * @see org.eclipse.core.runtime.IAdaptable#getAdapter(Class)
 */
public Object getAdapter(Class key) {
	if (key == AccessibleHandleProvider.class)
		return new AccessibleHandleProvider() {
			public List getAccessibleHandleLocations() {
				List result = new ArrayList();
				if (handles != null) {
					for (int i = 0; i < handles.size(); i++) {
						Point p = ((Handle) handles.get(i))
								.getAccessibleLocation();
						if (p != null)
							result.add(p);
					}
				}
				return result;
			}
		};
	return null;
}
 

import org.eclipse.gef.Handle; //导入依赖的package包/类
/**
 * @see GraphicalViewer#findHandleAt(org.eclipse.draw2d.geometry.Point)
 */
public Handle findHandleAt(Point p) {
	LayerManager layermanager = (LayerManager) getEditPartRegistry().get(
			LayerManager.ID);
	if (layermanager == null)
		return null;
	List list = new ArrayList(3);
	list.add(layermanager.getLayer(LayerConstants.PRIMARY_LAYER));
	list.add(layermanager.getLayer(LayerConstants.CONNECTION_LAYER));
	list.add(layermanager.getLayer(LayerConstants.FEEDBACK_LAYER));
	IFigure handle = getLightweightSystem().getRootFigure()
			.findFigureAtExcluding(p.x, p.y, list);
	if (handle instanceof Handle)
		return (Handle) handle;
	return null;
}
 

import org.eclipse.gef.Handle; //导入依赖的package包/类
/**
 * @see org.eclipse.gef.GraphicalViewer#findHandleAt(org.eclipse.draw2d.geometry.Point)
 */
public Handle findHandleAt(org.eclipse.draw2d.geometry.Point p) {
	final GraphicalEditPart gep = (GraphicalEditPart) findObjectAtExcluding(
			p, new ArrayList());
	if (gep == null || !(gep instanceof GuideEditPart))
		return null;
	return new Handle() {
		public DragTracker getDragTracker() {
			return ((GuideEditPart) gep).getDragTracker(null);
		}

		public org.eclipse.draw2d.geometry.Point getAccessibleLocation() {
			return null;
		}
	};
}
 

import org.eclipse.gef.Handle; //导入依赖的package包/类
/**
 * If in the initial state, updates the request and the mouse target and
 * asks to show target feedback. If in the traverse handle state, finds the
 * next handle, moves the mouse cursor to that handle, and gets a drag
 * tracker from the handle.
 * 
 * @see AbstractTool#handleMove()
 */
protected boolean handleMove() {
	if (stateTransition(STATE_ACCESSIBLE_DRAG, STATE_INITIAL))
		setDragTracker(null);
	if (isInState(STATE_INITIAL)) {
		updateTargetRequest();
		updateTargetUnderMouse();
		showTargetFeedback();
		return true;
	} else if (isInState(STATE_TRAVERSE_HANDLE)) {
		EditPartViewer viewer = getCurrentViewer();
		if (viewer instanceof GraphicalViewer) {
			Handle handle = ((GraphicalViewer) viewer)
					.findHandleAt(getLocation());
			if (handle != null) {
				setState(STATE_ACCESSIBLE_DRAG);
				setStartLocation(getLocation());
				setDragTracker(handle.getDragTracker());
				return true;
			} else {
				setState(STATE_INITIAL);
			}
		}
	}
	return false;
}
 

import org.eclipse.gef.Handle; //导入依赖的package包/类
/**
 * @see GraphicalViewer#findHandleAt(org.eclipse.draw2d.geometry.Point)
 */
public Handle findHandleAt( Point p )
{
	LayerManager layermanager = (LayerManager) getEditPartRegistry( ).get( LayerManager.ID );
	if ( layermanager == null )
		return null;
	List list = new ArrayList( 3 );
	// list.add(layermanager.getLayer(LayerConstants.PRIMARY_LAYER));
	list.add( layermanager.getLayer( LayerConstants.CONNECTION_LAYER ) );
	list.add( layermanager.getLayer( LayerConstants.FEEDBACK_LAYER ) );
	IFigure handle = getLightweightSystem( ).getRootFigure( )
			.findFigureAtExcluding( p.x, p.y, list );
	if ( handle instanceof Handle )
		return (Handle) handle;
	return null;
}
 

import org.eclipse.gef.Handle; //导入依赖的package包/类
/**
	 * Updates the target editpart and returns <code>true</code> if the target changes.  The
	 * target is updated by using the target conditional and the target request.  If the
	 * target has been locked, this method does nothing and returns <code>false</code>.
	 * @return <code>true</code> if the target was changed
	 */
//	protected EditPart getEditPartUnderMouse() {
//		
//			Collection exclude = getExclusionSet();
//			EditPart editPart = getCurrentViewer().findObjectAtExcluding(
//				getLocation(),
//				exclude,
//				getTargetingConditional());
//			if (editPart != null)
//				return editPart.getTargetEditPart(getTargetRequest());
//			return null;
//			
//	}
	protected Handle getHandleUnderMouse()
	{
		return ((DeferredGraphicalViewer)(getSourceEditPart().getViewer())).findHandleAt(getLocation());
	}
 

import org.eclipse.gef.Handle; //导入依赖的package包/类
@Override
protected List<Handle> createSelectionHandles() {
	List<Handle> list = new ArrayList<Handle>();

	GraphicalEditPart geditPart = getHost();
	list.add(new CellResizeHandle2(geditPart, PositionConstants.SOUTH));
	list.add(new CellResizeHandle2(geditPart, PositionConstants.NORTH));
	list.add(new CellResizeHandle2(geditPart, PositionConstants.EAST));
	list.add(new CellResizeHandle2(geditPart, PositionConstants.WEST));

	MoveHandle hand = new CellMoveHandle(geditPart, true, true);
	list.add(hand);

	return list;
}
 

import org.eclipse.gef.Handle; //导入依赖的package包/类
@Override
protected List<Handle> createSelectionHandles() {
	List<Handle> list = new ArrayList<Handle>();

	GraphicalEditPart geditPart = getHost();
	list.add(new CellResizeHandle2(geditPart, PositionConstants.SOUTH));
	list.add(new CellResizeHandle2(geditPart, PositionConstants.NORTH));
	list.add(new CellResizeHandle2(geditPart, PositionConstants.EAST));
	list.add(new CellResizeHandle2(geditPart, PositionConstants.WEST));

	MoveHandle hand = new CellMoveHandle(geditPart, true, false, -3);
	list.add(hand);

	return list;
}
 

import org.eclipse.gef.Handle; //导入依赖的package包/类
@Override
protected List<Handle> createSelectionHandles() {
	List<Handle> list = new ArrayList<Handle>();
	GraphicalEditPart geditPart = getHost();
	list.add(new CellResizeHandle(geditPart, PositionConstants.SOUTH));
	list.add(new CellResizeHandle(geditPart, PositionConstants.EAST));
	return list;
}
 

import org.eclipse.gef.Handle; //导入依赖的package包/类
/**
 * @see org.eclipse.gef.GraphicalViewer#findHandleAt(org.eclipse.draw2d.geometry.Point)
 */
public Handle findHandleAt(org.eclipse.draw2d.geometry.Point p) {
	final GraphicalEditPart gep = (GraphicalEditPart) findObjectAtExcluding(p, new ArrayList<Object>());
	if (gep == null || !(gep instanceof GuideEditPart))
		return null;
	return new Handle() {
		public DragTracker getDragTracker() {
			return ((GuideEditPart) gep).getDragTracker(null);
		}

		public org.eclipse.draw2d.geometry.Point getAccessibleLocation() {
			return null;
		}
	};
}
 

import org.eclipse.gef.Handle; //导入依赖的package包/类
static Handle createHandle(GraphicalEditPart owner, int direction,
		DragTracker tracker, Cursor cursor) {
	ResizeHandle handle = new ResizeHandle(owner, direction);
	handle.setCursor(cursor);
	handle.setDragTracker(tracker);
	return handle;
}
 

import org.eclipse.gef.Handle; //导入依赖的package包/类
static Handle createHandle(GraphicalEditPart owner, int direction,
		DragTracker tracker, Cursor cursor) {
	ResizeHandle handle = new ResizeHandle(owner, direction);
	handle.setDragTracker(tracker);
	handle.setCursor(cursor);
	return handle;
}
 

import org.eclipse.gef.Handle; //导入依赖的package包/类
/**
 * If there is a {@link Handle} under the mouse, this method sets the drag
 * tracker returned from the handle. If there's an {@link EditPart} under
 * the mouse, this method sets the drag tracker returned from the edit part.
 * 
 * @see AbstractTool#handleButtonDown(int)
 */
protected boolean handleButtonDown(int button) {
	if (!stateTransition(STATE_INITIAL, STATE_DRAG)) {
		resetHover();
		return true;
	}
	resetHover();
	EditPartViewer viewer = getCurrentViewer();
	Point p = getLocation();

	if (getDragTracker() != null)
		getDragTracker().deactivate();

	if (viewer instanceof GraphicalViewer) {
		Handle handle = ((GraphicalViewer) viewer).findHandleAt(p);
		if (handle != null) {
			setDragTracker(handle.getDragTracker());
			return true;
		}
	}
	updateTargetRequest();
	((SelectionRequest) getTargetRequest()).setLastButtonPressed(button);
	updateTargetUnderMouse();
	EditPart editpart = getTargetEditPart();
	if (editpart != null) {
		setDragTracker(editpart.getDragTracker(getTargetRequest()));
		lockTargetEditPart(editpart);
		return true;
	}
	return false;
}
 

import org.eclipse.gef.Handle; //导入依赖的package包/类
/**
 * @param owner
 * @return
 */
static Handle createHandle( CrosstabCellEditPart owner )
{

	CrosstabTableEditPart part = (CrosstabTableEditPart) owner.getParent( );
	Rectangle rect = part.getSelectBounds( );

	TableSelectionHandle handle = new TableSelectionHandle( owner, rect );
	handle.setCursor( SharedCursors.SIZEALL );

	return handle;
}