DragSourceDropEvent.java

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package java.awt.dnd;

/**
 * The {@code DragSourceDropEvent} is delivered
 * from the {@code DragSourceContextPeer},
 * via the {@code DragSourceContext}, to the {@code dragDropEnd}
 * method of {@code DragSourceListener}s registered with that
 * {@code DragSourceContext} and with its associated
 * {@code DragSource}.
 * It contains sufficient information for the
 * originator of the operation
 * to provide appropriate feedback to the end user
 * when the operation completes.
 *
 * @since 1.2
 */

public class DragSourceDropEvent extends DragSourceEvent {

    private static final long serialVersionUID = -5571321229470821891L;

    /**
     * Construct a {@code DragSourceDropEvent} for a drop,
     * given the
     * {@code DragSourceContext}, the drop action,
     * and a {@code boolean} indicating if the drop was successful.
     * The coordinates for this {@code DragSourceDropEvent}
     * are not specified, so {@code getLocation} will return
     * {@code null} for this event.
     * <p>
     * The argument {@code action} should be one of {@code DnDConstants}
     * that represents a single action.
     * This constructor does not throw any exception for invalid {@code action}.
     *
     * @param dsc the {@code DragSourceContext}
     * associated with this {@code DragSourceDropEvent}
     * @param action the drop action
     * @param success a boolean indicating if the drop was successful
     *
     * @throws IllegalArgumentException if {@code dsc} is {@code null}.
     *
     * @see DragSourceEvent#getLocation
     */

    public DragSourceDropEvent(DragSourceContext dsc, int action, boolean success) {
        super(dsc);

        dropSuccess = success;
        dropAction  = action;
    }

    /**
     * Construct a {@code DragSourceDropEvent} for a drop, given the
     * {@code DragSourceContext}, the drop action, a {@code boolean}
     * indicating if the drop was successful, and coordinates.
     * <p>
     * The argument {@code action} should be one of {@code DnDConstants}
     * that represents a single action.
     * This constructor does not throw any exception for invalid {@code action}.
     *
     * @param dsc the {@code DragSourceContext}
     * associated with this {@code DragSourceDropEvent}
     * @param action the drop action
     * @param success a boolean indicating if the drop was successful
     * @param x   the horizontal coordinate for the cursor location
     * @param y   the vertical coordinate for the cursor location
     *
     * @throws IllegalArgumentException if {@code dsc} is {@code null}.
     *
     * @since 1.4
     */
    public DragSourceDropEvent(DragSourceContext dsc, int action,
                               boolean success, int x, int y) {
        super(dsc, x, y);

        dropSuccess = success;
        dropAction  = action;
    }

    /**
     * Construct a {@code DragSourceDropEvent}
     * for a drag that does not result in a drop.
     * The coordinates for this {@code DragSourceDropEvent}
     * are not specified, so {@code getLocation} will return
     * {@code null} for this event.
     *
     * @param dsc the {@code DragSourceContext}
     *
     * @throws IllegalArgumentException if {@code dsc} is {@code null}.
     *
     * @see DragSourceEvent#getLocation
     */

    public DragSourceDropEvent(DragSourceContext dsc) {
        super(dsc);

        dropSuccess = false;
    }

    /**
     * This method returns a {@code boolean} indicating
     * if the drop was successful.
     *
     * @return {@code true} if the drop target accepted the drop and
     *         successfully performed a drop action;
     *         {@code false} if the drop target rejected the drop or
     *         if the drop target accepted the drop, but failed to perform
     *         a drop action.
     */

    public boolean getDropSuccess() { return dropSuccess; }

    /**
     * This method returns an {@code int} representing
     * the action performed by the target on the subject of the drop.
     *
     * @return the action performed by the target on the subject of the drop
     *         if the drop target accepted the drop and the target drop action
     *         is supported by the drag source; otherwise,
     *         {@code DnDConstants.ACTION_NONE}.
     */

    public int getDropAction() { return dropAction; }

    /*
     * fields
     */

    /**
     * {@code true} if the drop was successful.
     *
     * @serial
     */
    private boolean dropSuccess;

    /**
     * The drop action.
     *
     * @serial
     */
    private int     dropAction   = DnDConstants.ACTION_NONE;
}