java - JTextField keep filling the space of the JMenuBar -

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im trying add buttons , textfields jmenubar , after set jtextfield's preferredsize, jtextfield keeps on filling space on jmenubar.

note: jmenubar added using method - 

public static void setjpanelmenubar(jpanel parent, jpanel child, jmenubar menubar) {         parent.removeall();         parent.setlayout(new borderlayout());         jrootpane root = new jrootpane();         parent.add(root, borderlayout.center);         root.setjmenubar(menubar);         root.getcontentpane().add(child);         parent.putclientproperty("root", root);  //if need later     }

the code allows me add jmenubar in jpanel.

now on jmenubar code.

jmenubar x = jmenubar1;          x.removeall();          jtextfield searchbar = txtsearch;         jtextfield searchbar2 = new jtextfield();          searchbar2.setpreferredsize(new dimension(10,20));          x.add(lblsearch);         x.add(searchbar);         x.add(btnsearch);         x.add(box.createhorizontalglue());         x.add(searchbar2);

note: jmenubar1,lblsearch,txtsearch, , btnsearch created using netbeans.

to test this, added jtextfield called searchbar2 , set preferred size both keeps on occupying space left in jmenubar after added box glue.

any ideas why?

from how use boxlayout tutorial:

when boxlayout lays out components top bottom, tries size each component @ component's preferred height. if vertical space of layout not match sum of preferred heights, boxlayout tries resize components fill space. components either grow or shrink fill space, boxlayout honoring minimum , maximum sizes of each of components. space appears @ bottom of container.

(emphasis mine)

obviously same applies widths in horizontal box. in opinion, above should in actual javadoc boxlayout, it's not.

in case, easiest solution remove explicit call setpreferredsize, , instead set each jtextfield's maximum size match preferred size:

searchbar.setmaximumsize(searchbar.getpreferredsize()); searchbar2.setmaximumsize(searchbar2.getpreferredsize());

boxlayout tries respect minimum , maximum sizes.


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