JList location Index File List - Java Swing

Java examples for Swing:JList

  1. HOME
  2. Java
  3. Swing
  4. JList

Description

JList location Index File List

Demo Code

/*//w ww. j  ava2  s.  c o m
 *
 * Copyright (C) 2005-2008 Yves Zoundi
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * under the License.
 */
//package com.java2s;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Point;
import java.awt.Rectangle;
import javax.swing.JList;

import javax.swing.ListCellRenderer;
import javax.swing.ListModel;

public class Main {
    /**
     *
     * @param list
     * @param point
     * @return
     */
    public static int loc2IndexFileList(JList list, Point point) {
        int index = list.locationToIndex(point);

        if (index != -1) {
            Object bySize = list.getClientProperty("List.isFileList");

            if (bySize instanceof Boolean
                    && ((Boolean) bySize).booleanValue()
                    && !pointIsInActualBounds(list, index, point)) {
                index = -1;
            }
        }

        return index;
    }

    /**
     *
     * @param list
     * @param index
     * @param point
     * @return
     */
    public static boolean pointIsInActualBounds(JList list, int index,
            Point point) {
        ListCellRenderer renderer = list.getCellRenderer();
        ListModel dataModel = list.getModel();
        Object value = dataModel.getElementAt(index);
        Component item = renderer.getListCellRendererComponent(list, value,
                index, false, false);
        Dimension itemSize = item.getPreferredSize();
        Rectangle cellBounds = list.getCellBounds(index, index);

        if (!item.getComponentOrientation().isLeftToRight()) {
            cellBounds.x += (cellBounds.width - itemSize.width);
        }

        cellBounds.width = itemSize.width;

        return cellBounds.contains(point);
    }
}

Related Tutorials