Name: bsC130419 Date: 05/16/2001


java version "1.3.0_02"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0_02)
Java HotSpot(TM) Client VM (build 1.3.0_02, mixed mode)

The calculateTiledPositions() method of javax.swing.SizeRequirements
incorrectly overflows the allocated size by a couple of pixels when the
allocated size is less than the total preferred size of the components.

In this example, the allocated size is 25, which is greater than the minimum
total size of the child components (15), but less than the preferred total size
of the components (30).

The resulting tiled child components should then fall within the allocated
pixel range of 0 .. 24, with a total span of 25.

Instead, the last span returned by the method overflows the allocated size by
two pixels, and the total of the spans returned is 27.



/*
 * SizeRequirementsBugReport.java
 *
 * Created on May 11, 2001, 10:07 AM
 */

import javax.swing.SizeRequirements;

public class SizeRequirementsBugReport {

    public static void main (String args[]) {

        int allocated = 25;
        
        SizeRequirements widgets[] = new SizeRequirements[3];
        widgets[0] = new SizeRequirements(5, 10, 20, 0f);
        widgets[1] = new SizeRequirements(5, 10, 20, 0f);
        widgets[2] = new SizeRequirements(5, 10, 20, 0f);
        
        int[] offsets = new int[3];
        int[] spans = new int[3];
        
        SizeRequirements.calculateTiledPositions(allocated, null, widgets,
offsets, spans);
        System.out.println("allocated: " + allocated);
        int totalSpan = 0;
        for (int i = 0; i < 3; ++i) {
            System.out.println(" first pixel: " + offsets[i] +
                               " last pixel: " + (offsets[i] + spans[i] - 1) +
                               " (span of " + spans[i] + ")");
            totalSpan += spans[i];
        }
        System.out.println("total span: " + totalSpan);
    }

}



  Program output:

allocated: 25
    first pixel: 0 last pixel: 8 (span of 9)
    first pixel: 9 last pixel: 17 (span of 9)
    first pixel: 18 last pixel: 26 (span of 9)
total span: 27
(Review ID: 124230)
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