Java JTextComponent Row getRowStart(JTextComponent c, int offs)

Description

Determines the starting row model position of the row that contains the specified model position.

License

Open Source License

Parameter

Parameter	Description
c	the editor
offs	the offset in the document >= 0

Return

the position >= 0 if the request can be computed, otherwise a value of -1 will be returned.

Declaration

public static final int getRowStart(JTextComponent c, int offs) throws BadLocationException

Method Source Code


//package com.java2s;
/*/*from   ww w .j  a v  a2  s  .  c om*/
 * @(#)Utilities.java   1.38 01/12/03
 *
 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

import javax.swing.text.*;

import java.awt.Rectangle;

public class Main {
    /**
     * Determines the starting row model position of the row that contains
     * the specified model position.  The component given must have a
     * size to compute the result.  If the component doesn't have a size
     * a value of -1 will be returned.
     *
     * @param c the editor
     * @param offs the offset in the document >= 0
     * @return the position >= 0 if the request can be computed, otherwise
     *  a value of -1 will be returned.
     * @exception BadLocationException if the offset is out of range
     */
    public static final int getRowStart(JTextComponent c, int offs) throws BadLocationException {
        Rectangle r = c.modelToView(offs);
        if (r == null) {
            return -1;
        }
        int lastOffs = offs;
        int y = r.y;
        while ((r != null) && (y == r.y)) {
            offs = lastOffs;
            lastOffs -= 1;
            r = (lastOffs >= 0) ? c.modelToView(lastOffs) : null;
        }
        return offs;
    }
}