java - How to get the scrollbars to work in a ScrolledComposite when using GridLayout? -

i trying have scrolled composite fixed size content , label below scrolled composite display status information of scrollable content. want controls resize parent, have used gridlayout on parent. facing issue scroll bars of scrolled composite , positioning of label control. i.e, scrolling doesn't work unless set scrolledcomposite's grid data attribute as

grabexcessverticalspace = true 

if allow scrolledcomposite grab excess vertical space, label not appear below scrolledcomposite due space between them.

public class snippet5 {    public static void main(string[] args) {     display display = new display();     shell shell = new shell(display);     shell.setlayout(new gridlayout(1, true));      // button 400 x 400. scrollbars appear if window     // resized small show part of button     scrolledcomposite c1 = new scrolledcomposite(shell, swt.border | swt.h_scroll | swt.v_scroll);     button b1 = new button(c1, swt.push);     b1.settext("fixed size button");     b1.setsize(400, 400);     c1.setalwaysshowscrollbars(true);     c1.setlayoutdata(new griddata(swt.left, swt.top, true, true));     c1.setcontent(b1);      label l = new label(shell, swt.border);     l.settext("button clicked");     griddata layoutdata = new griddata(swt.left, swt.top, true, false);     layoutdata.heighthint = 30;     layoutdata.widthhint  = 400;     l.setlayoutdata(layoutdata);      shell.setsize(600, 300);     shell.open();     while (!shell.isdisposed()) {       if (!display.readanddispatch())         display.sleep();     }     display.dispose();   } } 

any in having label appear below scrolled composite (trim space) , have scrolling work appreciated.

edit:

expected behavior:

1. extra vertical space grabbed label.
2. the scrolledcomposite should enable vertical scrolling when content cannot viewed when shell re-sized.

you need set layout data of scrolledcomposite fill so:

new griddata( swt.fill, swt.fill, true, true ); 

this way, scrolledcomposite take available space of grid cell.