/* uDig - User Friendly Desktop Internet GIS client
* http://udig.refractions.net
* (C) 2004, Refractions Research Inc.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* (http://www.eclipse.org/legal/epl-v10.html), and the Refractions BSD
* License v1.0 (http://udig.refractions.net/files/bsd3-v10.html).
*/
package org.locationtech.udig.tools.edit.commands.selection;
import org.locationtech.udig.project.command.UndoableComposite;
import org.locationtech.udig.project.ui.render.displayAdapter.MapMouseEvent;
import org.locationtech.udig.tools.edit.EditPlugin;
import org.locationtech.udig.tools.edit.EditToolHandler;
import org.locationtech.udig.tools.edit.commands.SelectFeatureAsEditFeatureCommand;
import org.locationtech.udig.tools.edit.commands.SelectFeatureCommand;
import org.locationtech.udig.tools.edit.commands.SelectionParameter;
import org.locationtech.udig.tools.edit.commands.SelectionStrategy;
import org.locationtech.udig.tools.edit.support.EditBlackboard;
import org.locationtech.udig.tools.edit.support.Point;
import org.eclipse.core.runtime.IProgressMonitor;
import org.opengis.feature.simple.SimpleFeature;
import com.vividsolutions.jts.geom.Geometry;
/**
* A strategy for adding the features to the edit blackboard if no modifiers are down. The first feature
* is selected for editing each of the others are not.
* <p>
* Recognises the following SelectionParameter settings:
* <ul>
* <li>onlyAdd - true to add the feature to the existing selection
* (same effect can be had by using MOD1, ie control key on windows)
* <li>acceptableClasses
* <li>event
* </ul>
*
* @author jesse
* @since 1.1.0
*/
public class SelectFeatureStrategy implements SelectionStrategy {
/**
* @param monitor report progress
* @param commands UndoableComposte; any commands will be added to this composite
* @param parameters information controlling the selection process see class description for details
* @param feature Feature being selected
* @param firstFeature true if this is the first feature returned for selection
*/
public void run( IProgressMonitor monitor, UndoableComposite commands,
SelectionParameter parameters, SimpleFeature feature, boolean firstFeature ) {
EditToolHandler handler = parameters.handler;
Class< ? extends Geometry>[] acceptableClasses = parameters.acceptableClasses;
boolean onlyAdd = parameters.onlyAdd;
MapMouseEvent event = parameters.event;
for( Class< ? extends Geometry> clazz : acceptableClasses ) {
if (clazz.isAssignableFrom(feature.getDefaultGeometry().getClass())) {
EditPlugin.trace(EditPlugin.SELECTION,
"Feature is one of the acceptable classes " + feature.getID(), null); //$NON-NLS-1$
if (firstFeature && !keyboardModifierIndicatesAdd(handler, event) && !onlyAdd ) {
commands.addCommand(handler.getCommand(handler.getAcceptBehaviours()));
commands.addCommand(new SelectFeatureAsEditFeatureCommand(handler, feature,
handler.getEditLayer(), Point.valueOf(event.x, event.y)));
} else {
if (onlyAdd || keyboardModifierIndicatesAdd(handler, event)) {
// call SelectFeaturecommand so that it is the CurrentEditGeom
commands.addCommand(new SelectFeatureCommand(handler, feature, Point
.valueOf(event.x, event.y)));
} else {
// call SelectFeaturecommand so that it is just added to the EditBlackboard
// but
// not as the CurrentEditGeom
commands.addCommand(new SelectFeatureCommand(handler, feature, null));
}
}
} else {
EditPlugin.trace(EditPlugin.SELECTION,
"Feature is not one of the acceptable classes " + feature.getID(), null); //$NON-NLS-1$
}
}
}
/**
* Returns true if shift is down or MOD1 is down and the mouse is over the currently selected geometry
*/
private boolean keyboardModifierIndicatesAdd( EditToolHandler handler, MapMouseEvent event ) {
EditBlackboard editBlackboard = handler.getEditBlackboard(handler.getEditLayer());
boolean noIntersectingSelection = editBlackboard.getGeoms(event.x, event.y).isEmpty();
return event.isShiftDown()
|| (noIntersectingSelection && event
.isModifierDown(MapMouseEvent.MOD1_DOWN_MASK));
}
}