ShrinkSelectionAction.java

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/*
 * Gridarta MMORPG map editor for Crossfire, Daimonin and similar games.
 * Copyright (C) 2000-2015 The Gridarta Developers.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

package net.sf.gridarta.action;

import java.awt.Point;
import java.util.IdentityHashMap;
import java.util.List;
import java.util.Map;
import javax.swing.Action;
import net.sf.gridarta.gui.map.mapview.MapView;
import net.sf.gridarta.gui.map.mapview.MapViewManagerListener;
import net.sf.gridarta.model.archetype.Archetype;
import net.sf.gridarta.model.gameobject.GameObject;
import net.sf.gridarta.model.maparchobject.MapArchObject;
import net.sf.gridarta.model.mapgrid.MapGrid;
import net.sf.gridarta.model.mapgrid.MapGridEvent;
import net.sf.gridarta.model.mapgrid.MapGridListener;
import net.sf.gridarta.model.mapgrid.SelectionMode;
import net.sf.gridarta.model.mapmodel.MapModel;
import net.sf.gridarta.model.mapmodel.MapSquare;
import net.sf.gridarta.utils.EditorAction;
import net.sf.japi.swing.action.ActionMethod;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

public class ShrinkSelectionAction<G extends GameObject<G, A, R>, A extends MapArchObject<A>, R extends Archetype<G, A, R>> implements EditorAction, MapViewManagerListener<G, A, R> {

    @Nullable
    private MapView<G, A, R> currentMapView;

    @Nullable
    private Action action;

    @NotNull
    private final MapGridListener mapGridListener = new MapGridListener() {

        @Override
        public void mapGridChanged(@NotNull final MapGridEvent e) {
            updateAction();
        }

        @Override
        public void mapGridResized(@NotNull final MapGridEvent e) {
            updateAction();
        }

    };

    @ActionMethod
    public void shrinkSelection() {
        doShrinkSelection(true);
    }

    @Override
    public void setAction(@NotNull final Action action, @NotNull final String name) {
        this.action = action;
        updateAction();
    }

    private void updateAction() {
        if (action != null) {
            //noinspection ConstantConditions
            action.setEnabled(doShrinkSelection(false));
        }
    }

    private boolean doShrinkSelection(final boolean performAction) {
        final MapView<G, A, R> mapView = currentMapView;
        if (currentMapView == null) {
            return false;
        }

        final MapGrid mapGrid = mapView.getMapGrid();
        if (mapGrid.getSelectedRec() == null) {
            return false;
        }

        final List<MapSquare<G, A, R>> selectedSquares = mapView.getSelectedSquares();
        if (selectedSquares.isEmpty()) {
            return false;
        }

        if (performAction) {
            final MapModel<G, A, R> mapModel = mapView.getMapControl().getMapModel();
            final MapArchObject<A> mapArchObject = mapModel.getMapArchObject();
            final Point point = new Point();
            final Map<MapSquare<G, A, R>, Void> mapSquaresToShrink = new IdentityHashMap<>();
            mapGrid.beginTransaction();
            try {
                for (final MapSquare<G, A, R> mapSquare : selectedSquares) {
LOOP:
                    for (int dy = -1; dy <= 1; dy++) {
                        for (int dx = -1; dx <= 1; dx++) {
                            if (dx != 0 || dy != 0) {
                                mapSquare.getMapLocation(point, dx, dy);
                                if (mapArchObject.isPointValid(point) && (mapGrid.getFlags(point) & MapGrid.GRID_FLAG_SELECTION) == 0) {
                                    mapSquaresToShrink.put(mapSquare, null);
                                    break LOOP;
                                }
                            }
                        }
                    }
                }
                for (final MapSquare<G, A, R> mapSquare : mapSquaresToShrink.keySet()) {
                    mapSquare.getMapLocation(point);
                    mapGrid.select(point, SelectionMode.SUB);
                }
            } finally {
                mapGrid.endTransaction();
            }
        }

        return true;
    }

    @Override
    public void activeMapViewChanged(@Nullable final MapView<G, A, R> mapView) {
        if (currentMapView != null) {
            currentMapView.getMapGrid().removeMapGridListener(mapGridListener);
        }
        currentMapView = mapView;
        if (currentMapView != null) {
            currentMapView.getMapGrid().addMapGridListener(mapGridListener);
        }
        updateAction();
    }

    @Override
    public void mapViewCreated(@NotNull final MapView<G, A, R> mapView) {
        // ignore
    }

    @Override
    public void mapViewClosing(@NotNull final MapView<G, A, R> mapView) {
        // ignore
    }

}