82 lines
2.9 KiB
Java
82 lines
2.9 KiB
Java
/*
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* Copyright (c) 2012, 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 javax.swing.*;
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import java.awt.*;
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import java.awt.dnd.Autoscroll;
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public class JListWithScroll<E> extends JList<E> implements Autoscroll {
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private Insets scrollInsets;
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public JListWithScroll(E[] listData) {
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super(listData);
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scrollInsets = new Insets(50, 50, 50, 50);
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}
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@Override
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public Insets getAutoscrollInsets() {
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return scrollInsets;
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}
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@Override
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public void autoscroll(Point cursorLoc) {
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JViewport viewport = getViewport();
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if (viewport == null) {
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return;
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}
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Point viewPos = viewport.getViewPosition();
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int viewHeight = viewport.getExtentSize().height;
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int viewWidth = viewport.getExtentSize().width;
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if ((cursorLoc.y - viewPos.y) < scrollInsets.top) {
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viewport.setViewPosition(new Point(viewPos.x, Math.max(viewPos.y - scrollInsets.top, 0)));
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} else if (((viewPos.y + viewHeight) - cursorLoc.y) < scrollInsets.bottom) {
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viewport.setViewPosition(
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new Point(viewPos.x, Math.min(viewPos.y + scrollInsets.bottom, this.getHeight() - viewHeight))
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);
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} else if ((cursorLoc.x - viewPos.x) < scrollInsets.left) {
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viewport.setViewPosition(new Point(Math.max(viewPos.x - scrollInsets.left, 0), viewPos.y));
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} else if (((viewPos.x + viewWidth) - cursorLoc.x) < scrollInsets.right) {
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viewport.setViewPosition(
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new Point(Math.min(viewPos.x + scrollInsets.right, this.getWidth() - viewWidth), viewPos.y)
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);
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}
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}
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public JViewport getViewport() {
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Component curComp = this;
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while (!(curComp instanceof JViewport) && (curComp != null)) {
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curComp = curComp.getParent();
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}
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if(curComp instanceof JViewport) {
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return (JViewport) curComp;
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} else {
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return null;
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}
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}
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}
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