package org.eclipse.papyrus.uml.diagram.statemachine.custom.locators;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.PositionConstants;
import org.eclipse.draw2d.geometry.Point;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.gmf.runtime.diagram.ui.figures.IBorderItemLocator;
/**
* This class is used to constrain the position of Entry/Exit points when they are added on a StateMachine
*
*/
public class CustomEntryExitPointPositionLocator implements IBorderItemLocator {
/** the figure around which this border item appears */
protected IFigure parentFigure = null;
/** the width of the area surrounding the parent figure where border item can be put */
protected int borderItemOffset = 10;
/** the position constraint */
protected Rectangle constraint = new Rectangle(0, 0, 0, 0);
/** Constructor **/
public CustomEntryExitPointPositionLocator(IFigure parentFigure, int preferredSide) {
// The preferredSide parameter is not used, just kept here to ensure compatibility
// with GMF generated code.
this.parentFigure = parentFigure;
}
/**
*
* @see org.eclipse.gmf.runtime.draw2d.ui.figures.IBorderItemLocator#getCurrentSideOfParent()
*
* @return
* the position of the port around its parent. This position can be
* <ul>
* <li>{@linkplain PositionConstants#NORTH}</li>
* <li> {@linkplain PositionConstants#SOUTH}</li>
* <li> {@linkplain PositionConstants#EAST}</li>
* <li> {@linkplain PositionConstants#WEST}</li>
* <li> {@linkplain PositionConstants#NORTH_EAST}</li>
* <li> {@linkplain PositionConstants#NORTH_WEST}</li>
* <li> {@linkplain PositionConstants#SOUTH_EAST}</li>
* <li> {@linkplain PositionConstants#SOUTH_WEST}</li>
* </ul>
*/
public int getCurrentSideOfParent() {
int position = PositionConstants.NONE;
System.out.println("parentsBounds = " + parentFigure.getBounds());
//we are not on EAST, not on WEST, but we are on the NORTH
if((constraint.x != parentFigure.getBounds().width - borderItemOffset) && (constraint.x != -this.borderItemOffset) && (constraint.y == -this.borderItemOffset)) {
position = PositionConstants.NORTH;
//we are not on the EAST and not on the WEST, but we are on the SOUTH
} else if((constraint.x != parentFigure.getBounds().width - borderItemOffset) && (constraint.x != -this.borderItemOffset) && (constraint.y == parentFigure.getBounds().height - borderItemOffset)) {
position = PositionConstants.SOUTH;
//we are on the EAST, but we are not on the NORTH and not on the SOUTH
} else if((constraint.x == parentFigure.getBounds().width - borderItemOffset) && (constraint.y != -this.borderItemOffset) && (constraint.y != parentFigure.getBounds().height - borderItemOffset)) {
position = PositionConstants.EAST;
//we are on the WEST, but we are not on the on the NORTH and not on the SOUTH
} else if((constraint.x == -this.borderItemOffset) && (constraint.y != -this.borderItemOffset) && (constraint.y != parentFigure.getBounds().height - borderItemOffset)) {
position = PositionConstants.WEST;
//we are on the NORTH and on the EAST
} else if((constraint.x == parentFigure.getBounds().width - borderItemOffset) && (constraint.y == -this.borderItemOffset)) {
position = PositionConstants.NORTH_EAST;
//we are on the NORTH and on the WEST
} else if((constraint.x == -this.borderItemOffset) && (constraint.y == -this.borderItemOffset)) {
position = PositionConstants.NORTH_WEST;
//we are on the EAST and on the SOUTH
} else if((constraint.x == parentFigure.getBounds().width - borderItemOffset) && (constraint.y == parentFigure.getBounds().height - borderItemOffset)) {
position = PositionConstants.SOUTH_EAST;
//we are on the WEST and on the SOUTH
} else if((constraint.x == -this.borderItemOffset) && (constraint.y == parentFigure.getBounds().height - borderItemOffset)) {
position = PositionConstants.SOUTH_WEST;
}
return position;
}
/**
* get the parent figure
*
* @return the parent figure
*/
public IFigure getParentFigure() {
return parentFigure;
}
/**
*
* @param proposedLocation
* the proposed location
* @return a possible location on parent figure border
*/
public Rectangle getPreferredLocation(Rectangle proposedLocation) {
// Initialize port location with proposed location
// and resolve the bounds of it graphical parent
Rectangle realLocation = new Rectangle(proposedLocation);
Rectangle parentRec = getParentFigure().getBounds().getCopy();
// Calculate Max position around the graphical parent (1/2 size or the port around
// the graphical parent bounds.
int xMin = parentRec.x - borderItemOffset;
int xMax = parentRec.x - borderItemOffset + parentRec.width;
int yMin = parentRec.y - borderItemOffset;
int yMax = parentRec.y - borderItemOffset + parentRec.height;
// Modify Port location if MAX X or Y are exceeded
if(realLocation.x < xMin) {
realLocation.x = xMin;
}
if(realLocation.x > xMax) {
realLocation.x = xMax;
}
if(realLocation.y < yMin) {
realLocation.y = yMin;
}
if(realLocation.y > yMax) {
realLocation.y = yMax;
}
// Ensure the port is positioned on its parent borders and not in the middle.
// Modify position if needed.
if((realLocation.y != yMin) && (realLocation.y != yMax)) {
if((realLocation.x != xMin) && (realLocation.x != xMax)) {
if(realLocation.x <= (xMin + (parentRec.width / 2))) {
realLocation.x = xMin;
} else {
realLocation.x = xMax;
}
}
}
// Return constrained location
return realLocation;
}
/**
*
* @see org.eclipse.gmf.runtime.draw2d.ui.figures.IBorderItemLocator#getValidLocation(org.eclipse.draw2d.geometry.Rectangle,
* org.eclipse.draw2d.IFigure)
*
* @param proposedLocation
* @param borderItem
* @return a valid location
*/
public Rectangle getValidLocation(Rectangle proposedLocation, IFigure borderItem) {
return getPreferredLocation(proposedLocation);
}
/**
*
* @see org.eclipse.draw2d.Locator#relocate(org.eclipse.draw2d.IFigure)
*
* @param target
*/
public void relocate(IFigure target) {
Rectangle proposedLocation = constraint.getCopy();
proposedLocation.setLocation(constraint.getLocation().translate(parentFigure.getBounds().getTopLeft()));
Point validLocation = getValidLocation(proposedLocation, target).getLocation();
target.setBounds(new Rectangle(validLocation, target.getPreferredSize()));
}
/**
*
* @see org.eclipse.gmf.runtime.draw2d.ui.figures.IBorderItemLocator#setConstraint(org.eclipse.draw2d.geometry.Rectangle)
*
* @param constraint
*/
public void setConstraint(Rectangle constraint) {
this.constraint = constraint;
}
}