boxhandlekit.java

来自「开源（Open Source）项目JHotDraw的文档和源程序」· Java 代码 · 共 187 行

/*
 * @(#)BoxHandleKit.java 5.2
 *
 */

package CH.ifa.draw.standard;

import CH.ifa.draw.framework.*;
import java.awt.*;
import java.util.Vector;

/**
 * A set of utility methods to create Handles for the common
 * locations on a figure's display box.
 * @see Handle
 */

 // TBD: use anonymous inner classes (had some problems with JDK 1.1)

public class BoxHandleKit {

    /**
     * Fills the given Vector with handles at each corner of a
     * figure.
     */
    static public void addCornerHandles(Figure f, Vector handles) {
        handles.addElement(southEast(f));
        handles.addElement(southWest(f));
        handles.addElement(northEast(f));
        handles.addElement(northWest(f));
    }

    /**
     * Fills the given Vector with handles at each corner
     * and the north, south, east, and west of the figure.
     */
    static public void addHandles(Figure f, Vector handles) {
        addCornerHandles(f, handles);
        handles.addElement(south(f));
        handles.addElement(north(f));
        handles.addElement(east(f));
        handles.addElement(west(f));
    }

    static public Handle south(Figure owner) {
        return new SouthHandle(owner);
    }

    static public Handle southEast(Figure owner) {
        return new SouthEastHandle(owner);
    }

    static public Handle southWest(Figure owner) {
        return new SouthWestHandle(owner);
    }

    static public Handle north(Figure owner) {
        return new NorthHandle(owner);
    }

    static public Handle northEast(Figure owner) {
        return new NorthEastHandle(owner);
    }

    static public Handle northWest(Figure owner) {
        return new NorthWestHandle(owner);
    }

    static public Handle east(Figure owner) {
        return new EastHandle(owner);
    }
    static public Handle west(Figure owner) {
        return new WestHandle(owner);
    }
}

class NorthEastHandle extends LocatorHandle {
    NorthEastHandle(Figure owner) {
        super(owner, RelativeLocator.northEast());
    }

    public void invokeStep (int x, int y, int anchorX, int anchorY, DrawingView view) {
        Rectangle r = owner().displayBox();
        owner().displayBox(
            new Point(r.x, Math.min(r.y + r.height, y)),
            new Point(Math.max(r.x, x), r.y + r.height)
        );
    }
}

class EastHandle extends LocatorHandle {
    EastHandle(Figure owner) {
        super(owner, RelativeLocator.east());
    }

    public void invokeStep (int x, int y, int anchorX, int anchorY, DrawingView view) {
        Rectangle r = owner().displayBox();
        owner().displayBox(
            new Point(r.x, r.y), new Point(Math.max(r.x, x), r.y + r.height)
        );
    }
}

class NorthHandle extends LocatorHandle {
    NorthHandle(Figure owner) {
        super(owner, RelativeLocator.north());
    }

    public void invokeStep (int x, int y, int anchorX, int anchorY, DrawingView view) {
        Rectangle r = owner().displayBox();
        owner().displayBox(
            new Point(r.x, Math.min(r.y + r.height, y)),
            new Point(r.x + r.width, r.y + r.height)
        );
    }
}

class NorthWestHandle extends LocatorHandle {
    NorthWestHandle(Figure owner) {
        super(owner, RelativeLocator.northWest());
    }

    public void invokeStep (int x, int y, int anchorX, int anchorY, DrawingView view) {
        Rectangle r = owner().displayBox();
        owner().displayBox(
            new Point(Math.min(r.x + r.width, x), Math.min(r.y + r.height, y)),
            new Point(r.x + r.width, r.y + r.height)
        );
    }
}

class SouthEastHandle extends LocatorHandle {
    SouthEastHandle(Figure owner) {
        super(owner, RelativeLocator.southEast());
    }

    public void invokeStep (int x, int y, int anchorX, int anchorY, DrawingView view) {
        Rectangle r = owner().displayBox();
        owner().displayBox(
            new Point(r.x, r.y),
            new Point(Math.max(r.x, x), Math.max(r.y, y))
        );
    }
}

class SouthHandle extends LocatorHandle {
    SouthHandle(Figure owner) {
        super(owner, RelativeLocator.south());
    }

    public void invokeStep (int x, int y, int anchorX, int anchorY, DrawingView view) {
        Rectangle r = owner().displayBox();
        owner().displayBox(
            new Point(r.x, r.y),
            new Point(r.x + r.width, Math.max(r.y, y))
        );
    }
}

class SouthWestHandle extends LocatorHandle {
    SouthWestHandle(Figure owner) {
        super(owner, RelativeLocator.southWest());
    }

    public void invokeStep (int x, int y, int anchorX, int anchorY, DrawingView view) {
        Rectangle r = owner().displayBox();
        owner().displayBox(
            new Point(Math.min(r.x + r.width, x), r.y),
            new Point(r.x + r.width, Math.max(r.y, y))
        );
    }
}

class WestHandle extends LocatorHandle {
    WestHandle(Figure owner) {
        super(owner, RelativeLocator.west());
    }

    public void invokeStep (int x, int y, int anchorX, int anchorY, DrawingView view) {
        Rectangle r = owner().displayBox();
        owner().displayBox(
            new Point(Math.min(r.x + r.width, x), r.y),
            new Point(r.x + r.width, r.y + r.height)
        );
    }
}