116 lines
3.8 KiB
Java
116 lines
3.8 KiB
Java
/*
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* Copyright (c) 1999, 2024, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.awt.Button;
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import java.awt.Color;
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import java.awt.Panel;
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import java.awt.datatransfer.DataFlavor;
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import java.awt.datatransfer.Transferable;
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import java.awt.datatransfer.UnsupportedFlavorException;
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import java.awt.dnd.DnDConstants;
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import java.awt.dnd.DropTarget;
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import java.awt.dnd.DropTargetContext;
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import java.awt.dnd.DropTargetDragEvent;
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import java.awt.dnd.DropTargetDropEvent;
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import java.awt.dnd.DropTargetEvent;
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import java.awt.dnd.DropTargetListener;
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import java.io.IOException;
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class DnDTarget extends Panel implements DropTargetListener {
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Color bgColor;
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Color htColor;
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DnDTarget(Color bgColor, Color htColor) {
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super();
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this.bgColor = bgColor;
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this.htColor = htColor;
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setBackground(bgColor);
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setDropTarget(new DropTarget(this, this));
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}
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public void dragEnter(DropTargetDragEvent e) {
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System.err.println("[Target] dragEnter");
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e.acceptDrag(DnDConstants.ACTION_COPY);
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setBackground(htColor);
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repaint();
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}
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public void dragOver(DropTargetDragEvent e) {
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System.err.println("[Target] dragOver");
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e.acceptDrag(DnDConstants.ACTION_COPY);
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}
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public void dragExit(DropTargetEvent e) {
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System.err.println("[Target] dragExit");
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setBackground(bgColor);
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repaint();
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}
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public void drop(DropTargetDropEvent dtde) {
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System.err.println("[Target] drop");
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DropTargetContext dtc = dtde.getDropTargetContext();
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if ((dtde.getSourceActions() & DnDConstants.ACTION_COPY) != 0) {
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dtde.acceptDrop(DnDConstants.ACTION_COPY);
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} else {
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dtde.rejectDrop();
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return;
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}
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DataFlavor[] dfs = dtde.getCurrentDataFlavors();
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if (dfs != null && dfs.length >= 1) {
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Transferable transfer = dtde.getTransferable();
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Object obj;
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try {
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obj = transfer.getTransferData(dfs[0]);
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} catch (IOException | UnsupportedFlavorException ex) {
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System.err.println(ex.getMessage());
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dtc.dropComplete(false);
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return;
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}
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if (obj != null) {
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Button button;
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try {
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button = (Button) obj;
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} catch (Exception e) {
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System.err.println(e.getMessage());
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dtc.dropComplete(false);
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return;
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}
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add(button);
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repaint();
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}
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}
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setBackground(bgColor);
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invalidate();
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validate();
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repaint();
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dtc.dropComplete(true);
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}
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public void dropActionChanged(DropTargetDragEvent e) {
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System.err.println("[Target] dropActionChanged");
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}
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}
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