Re: Simple BorderLayout problem

From:
Fencer <no.i.dont@want.mail.from.spammers.com>
Newsgroups:
comp.lang.java.programmer
Date:
Mon, 15 Feb 2010 23:13:50 +0100
Message-ID:
<7ttv90F613U1@mid.individual.net>
On 2010-02-15 17:50, Fencer wrote:
[snip my OP]

Thanks for your replies. I've decided to take a look at GridBagLayout as
suggested. Since I'm a layout-newbie I wanted to be able to print the
state of a GridBagConstraints object, so I wrote this helper class:

package main;

import java.awt.GridBagConstraints;

public class PrintGridBagConstraints {

    public static void print(GridBagConstraints gbc) {
       String out = "";

       out += "gridx: " + (gbc.gridx == GridBagConstraints.RELATIVE ?
"RELATIVE" : gbc.gridx) + "\n";
       out += "gridy: " + (gbc.gridy == GridBagConstraints.RELATIVE ?
"RELATIVE" : gbc.gridy) + "\n";
       out += "gridwidth: " + getGridHeightOrWidth(gbc.gridwidth) + "\n";
       out += "gridheight: " + getGridHeightOrWidth(gbc.gridheight) + "\n";
       out += "weightx: " + gbc.weightx + "\n";
       out += "weighty: " + gbc.weighty + "\n";
       out += "anchor: " + getAnchor(gbc.anchor) + "\n";
       out += "fill: " + Fill.fromInt(gbc.fill).toString() + "\n";

       System.out.print(out);
    }

    private static String getAnchor(int anchor) {
       Anchor a = Anchor.fromInt(anchor);

       if (a == Anchor.UNDEFINED) {
          return anchor + " - undefined";
       }
       else {
          return a.toString();
       }
    }

    private static String getGridHeightOrWidth(int heightOrWidth) {
       if (heightOrWidth == GridBagConstraints.RELATIVE) {
          return "RELATIVE";
       }
       else if (heightOrWidth == GridBagConstraints.REMAINDER) {
          return "REMAINDER";
       }
       else {
          return Integer.toString(heightOrWidth);
       }
    }

    /*
     * There are three kinds of possible values: orientation relative,
baseline relative and absolute.
     * Orientation relative values are interpreted relative to the
container's component orientation
     * property, baseline relative values are interpreted relative to
the baseline and absolute
     * values are not.
     * The absolute values are: CENTER, NORTH, NORTHEAST, EAST,
SOUTHEAST, SOUTH, SOUTHWEST, WEST,
     * and NORTHWEST.
     * The orientation relative values are: PAGE_START, PAGE_END,
LINE_START, LINE_END,
     * FIRST_LINE_START, FIRST_LINE_END, LAST_LINE_START and LAST_LINE_END.
     * The baseline relvative values are: BASELINE, BASELINE_LEADING,
BASELINE_TRAILING, ABOVE_BASELINE,
     * ABOVE_BASELINE_LEADING, ABOVE_BASELINE_TRAILING, BELOW_BASELINE,
BELOW_BASELINE_LEADING, and
     * BELOW_BASELINE_TRAILING. The default value is CENTER.
     */
    enum Anchor {
       /* Absolute values start. */
       CENTER(GridBagConstraints.CENTER, "Absolute"),
          NORTH(GridBagConstraints.NORTH, "Absolute"),
          NORTHEAST(GridBagConstraints.NORTHEAST, "Absolute"),
          EAST(GridBagConstraints.EAST, "Absolute"),
          SOUTHEAST(GridBagConstraints.SOUTHEAST, "Absolute"),
          SOUTH(GridBagConstraints.SOUTH, "Absolute"),
          SOUTHWEST(GridBagConstraints.SOUTHWEST, "Absolute"),
          WEST(GridBagConstraints.WEST, "Absolute"),
          NORTHWEST(GridBagConstraints.NORTHWEST, "Absolute"),
          /* Absolute values end. */

          /* Orientation relative values start. */
          PAGE_START(GridBagConstraints.PAGE_START, "Orientation relative"),
          PAGE_END(GridBagConstraints.PAGE_END, "Orientation relative"),
          LINE_START(GridBagConstraints.LINE_START, "Orientation relative"),
          LINE_END(GridBagConstraints.LINE_END, "Orientation relative"),
          FIRST_LINE_START(GridBagConstraints.FIRST_LINE_START,
"Orientation relative"),
          FIRST_LINE_END(GridBagConstraints.FIRST_LINE_END, "Orientation
relative"),
          LAST_LINE_START(GridBagConstraints.LAST_LINE_START,
"Orientation relative"),
          LAST_LINE_END(GridBagConstraints.LAST_LINE_END, "Orientation
relative"),
          /* Orientation relative values end. */

          /* Baseline relative values start. */
          BASELINE(GridBagConstraints.BASELINE, "Baseline relative"),
          BASELINE_LEADING(GridBagConstraints.BASELINE_LEADING,
"Baseline relative"),
          BASELINE_TRAILING(GridBagConstraints.ABOVE_BASELINE_TRAILING,
"Baseline relative"),
          ABOVE_BASELINE(GridBagConstraints.ABOVE_BASELINE, "Baseline
relative"),
 
ABOVE_BASELINE_LEADING(GridBagConstraints.ABOVE_BASELINE_LEADING,
"Baseline relative"),
 
ABOVE_BASELINE_TRAILING(GridBagConstraints.ABOVE_BASELINE_TRAILING,
"Baseline relative"),
          BELOW_BASELINE(GridBagConstraints.BELOW_BASELINE, "Baseline
relative"),
 
BELOW_BASELINE_LEADING(GridBagConstraints.BELOW_BASELINE_LEADING,
"Baseline relative"),
 
BELOW_BASELINE_TRAILING(GridBagConstraints.BELOW_BASELINE_TRAILING,
"Baseline relative"),
          /* Baseline relative values end. */

          UNDEFINED(-1337, "");

       public static Anchor fromInt(int value) {
          for (Anchor a : Anchor.values()) {
             if (a.ordinal() == value) {
                return a;
             }
          }

          return Anchor.UNDEFINED;
       }

       @Override
          public String toString() {
          return this.name() + " - " + type;
       }

       private Anchor(int value, String type) {
          this.type = type;
       }

       private String type;
    }

    enum Fill {
       NONE(GridBagConstraints.NONE),
          HORIZONTAL(GridBagConstraints.HORIZONTAL),
          VERTICAL(GridBagConstraints.VERTICAL),
          BOTH(GridBagConstraints.BOTH),

          UNDEFINED(-1337);

       public static Fill fromInt(int value) {
          for (Fill f : Fill.values()) {
             if (f.ordinal() == value) {
                return f;
             }
          }

          return Fill.UNDEFINED;
       }

       private Fill(int value) {
       }
    }
}

Was there an easier way to do that instead of writing that code? :-)

The output from the public static print method() can look like:
gridx: RELATIVE
gridy: RELATIVE
gridwidth: REMAINDER
gridheight: 1
weightx: 0.0
weighty: 0.0
anchor: ABOVE_BASELINE - Baseline relative
fill: VERTICAL

Btw, I found a spelling error in the official documentation when writing
that code (that exists in the docs for both java 6 and 7). The word
relvative appears under the description of the anchor field (I've
retained it in my comment of my Anchor enum).

Armed with this helper class I will now try to work GridBagLayout work
as I want it. I have another control I want place in a particular place
apart from the centered JPanel in my OP. I will post back if I can't
make it work.

- F

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