/*
* @(#)DropTargetDropEvent.java 1.28 04/05/05
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.awt.dnd;
import java.awt.Point;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.util.List;
/**
* The <code>DropTargetDropEvent</code> is delivered
* via the <code>DropTargetListener</code> drop() method.
* <p>
* The <code>DropTargetDropEvent</code> reports the <i>source drop actions</i>
* and the <i>user drop action</i> that reflect the current state of the
* drag-and-drop operation.
* <p>
* <i>Source drop actions</i> is a bitwise mask of <code>DnDConstants</code>
* that represents the set of drop actions supported by the drag source for
* this drag-and-drop operation.
* <p>
* <i>User drop action</i> depends on the drop actions supported by the drag
* source and the drop action selected by the user. The user can select a drop
* action by pressing modifier keys during the drag operation:
* <pre>
* Ctrl + Shift -> ACTION_LINK
* Ctrl -> ACTION_COPY
* Shift -> ACTION_MOVE
* </pre>
* If the user selects a drop action, the <i>user drop action</i> is one of
* <code>DnDConstants</code> that represents the selected drop action if this
* drop action is supported by the drag source or
* <code>DnDConstants.ACTION_NONE</code> if this drop action is not supported
* by the drag source.
* <p>
* If the user doesn't select a drop action, the set of
* <code>DnDConstants</code> that represents the set of drop actions supported
* by the drag source is searched for <code>DnDConstants.ACTION_MOVE</code>,
* then for <code>DnDConstants.ACTION_COPY</code>, then for
* <code>DnDConstants.ACTION_LINK</code> and the <i>user drop action</i> is the
* first constant found. If no constant is found the <i>user drop action</i>
* is <code>DnDConstants.ACTION_NONE</code>.
*
* @version 1.28, 05/05/04
* @since 1.2
*/
public class DropTargetDropEvent extends DropTargetEvent {
private static final long serialVersionUID = -1721911170440459322L;
/**
* Construct a <code>DropTargetDropEvent</code> given
* the <code>DropTargetContext</code> for this operation,
* the location of the drag <code>Cursor</code>'s
* hotspot in the <code>Component</code>'s coordinates,
* the currently
* selected user drop action, and the current set of
* actions supported by the source.
* By default, this constructor
* assumes that the target is not in the same virtual machine as
* the source; that is, {@link #isLocalTransfer()} will
* return <code>false</code>.
* <P>
* @param dtc The <code>DropTargetContext</code> for this operation
* @param cursorLocn The location of the "Drag" Cursor's
* hotspot in <code>Component</code> coordinates
* @param dropAction the user drop action.
* @param srcActions the source drop actions.
*
* @throws <code>NullPointerException</code>
* if cursorLocn is <code>null</code>
* @throws <code>IllegalArgumentException</code> if dropAction is not one of
* <code>DnDConstants</code>.
* @throws <code>IllegalArgumentException</code> if srcActions is not
* a bitwise mask of <code>DnDConstants</code>.
* @throws <code>IllegalArgumentException</code> if dtc is <code>null</code>.
*/
public DropTargetDropEvent(DropTargetContext dtc, Point cursorLocn, int dropAction, int srcActions) {
super(dtc);
if (cursorLocn == null) throw new NullPointerException("cursorLocn");
if (dropAction != DnDConstants.ACTION_NONE &&
dropAction != DnDConstants.ACTION_COPY &&
dropAction != DnDConstants.ACTION_MOVE &&
dropAction != DnDConstants.ACTION_LINK
) throw new IllegalArgumentException("dropAction = " + dropAction);
if ((srcActions & ~(DnDConstants.ACTION_COPY_OR_MOVE | DnDConstants.ACTION_LINK)) != 0) throw new IllegalArgumentException("srcActions");
location = cursorLocn;
actions = srcActions;
this.dropAction = dropAction;
}
/**
* Construct a <code>DropTargetEvent</code> given the
* <code>DropTargetContext</code> for this operation,
* the location of the drag <code>Cursor</code>'s hotspot
* in the <code>Component</code>'s
* coordinates, the currently selected user drop action,
* the current set of actions supported by the source,
* and a <code>boolean</code> indicating if the source is in the same JVM
* as the target.
* <P>
* @param dtc The DropTargetContext for this operation
* @param cursorLocn The location of the "Drag" Cursor's
* hotspot in Component's coordinates
* @param dropAction the user drop action.
* @param srcActions the source drop actions.
* @param isLocal True if the source is in the same JVM as the target
*
* @throws <code>NullPointerException</code> if cursorLocn is
* <code>null</code>
* @throws <code>IllegalArgumentException</code> if dropAction is not one of
* <code>DnDConstants</code>.
* @throws <code>IllegalArgumentException</code> if srcActions is not
* a bitwise mask of <code>DnDConstants</code>.
* @throws <code>IllegalArgumentException</code> if dtc is <code>null</code>.
*/
public DropTargetDropEvent(DropTargetContext dtc, Point cursorLocn, int dropAction, int srcActions, boolean isLocal) {
this(dtc, cursorLocn, dropAction, srcActions);
isLocalTx = isLocal;
}
/**
* This method returns a <code>Point</code>
* indicating the <code>Cursor</code>'s current
* location in the <code>Component</code>'s coordinates.
* <P>
* @return the current <code>Cursor</code> location in Component's coords.
*/
public Point getLocation() {
return location;
}
/**
* This method returns the current DataFlavors.
* <P>
* @return current DataFlavors
*/
public DataFlavor[] getCurrentDataFlavors() {
return getDropTargetContext().getCurrentDataFlavors();
}
/**
* This method returns the currently available
* <code>DataFlavor</code>s as a <code>java.util.List</code>.
* <P>
* @return the currently available DataFlavors as a java.util.List
*/
public List<DataFlavor> getCurrentDataFlavorsAsList() {
return getDropTargetContext().getCurrentDataFlavorsAsList();
}
/**
* This method returns a <code>boolean</code> indicating if the
* specified <code>DataFlavor</code> is available
* from the source.
* <P>
* @param df the <code>DataFlavor</code> to test
* <P>
* @return if the DataFlavor specified is available from the source
*/
public boolean isDataFlavorSupported(DataFlavor df) {
return getDropTargetContext().isDataFlavorSupported(df);
}
/**
* This method returns the source drop actions.
*
* @return the source drop actions.
*/
public int getSourceActions() { return actions; }
/**
* This method returns the user drop action.
*
* @return the user drop actions.
*/
public int getDropAction() { return dropAction; }
/**
* This method returns the <code>Transferable</code> object
* associated with the drop.
* <P>
* @return the <code>Transferable</code> associated with the drop
*/
public Transferable getTransferable() {
return getDropTargetContext().getTransferable();
}
/**
* accept the drop, using the specified action.
* <P>
* @param dropAction the specified action
*/
public void acceptDrop(int dropAction) {
getDropTargetContext().acceptDrop(dropAction);
}
/**
* reject the Drop.
*/
public void rejectDrop() {
getDropTargetContext().rejectDrop();
}
/**
* This method notifies the <code>DragSource</code>
* that the drop transfer(s) are completed.
* <P>
* @param success a <code>boolean</code> indicating that the drop transfer(s) are completed.
*/
public void dropComplete(boolean success) {
getDropTargetContext().dropComplete(success);
}
/**
* This method returns an <code>int</code> indicating if
* the source is in the same JVM as the target.
* <P>
* @return if the Source is in the same JVM
*/
public boolean isLocalTransfer() {
return isLocalTx;
}
/*
* fields
*/
static final private Point zero = new Point(0,0);
/**
* The location of the drag cursor's hotspot in Component coordinates.
*
* @serial
*/
private Point location = zero;
/**
* The source drop actions.
*
* @serial
*/
private int actions = DnDConstants.ACTION_NONE;
/**
* The user drop action.
*
* @serial
*/
private int dropAction = DnDConstants.ACTION_NONE;
/**
* <code>true</code> if the source is in the same JVM as the target.
*
* @serial
*/
private boolean isLocalTx = false;
}
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