java - How to get rid of wasted space in SWT ScrolledComposite when the scrollbars are not shown -


i have horizontal scrolledcomposite holding 2 buttons (actually composite 2 buttons). space scroll bar allocated if scroll bars hidden. (they hidden, when horizontal space sufficient , scrolling not necessary.)

enter image description here

how can rid of wasted space?

in mean time have configured scrolled composite show scrollbars (setalwaysshowscrollbars(true)), rather prefer rid of wasted space.

enter image description here

thank consideration.

import org.eclipse.swt.swt; import org.eclipse.swt.custom.scrolledcomposite; import org.eclipse.swt.layout.filllayout; import org.eclipse.swt.layout.griddata; import org.eclipse.swt.layout.gridlayout; import org.eclipse.swt.widgets.button; import org.eclipse.swt.widgets.composite; import org.eclipse.swt.widgets.display; import org.eclipse.swt.widgets.shell;  public class scrollbarspaceissue extends composite {     public scrollbarspaceissue(final composite parent, final int style)     {         super(parent, style);          setlayout(new gridlayout(1, false));          final scrolledcomposite scrolledcomposite = new scrolledcomposite(this, swt.border | swt.h_scroll);         scrolledcomposite.setlayoutdata(new griddata(swt.fill, swt.center, true, false, 1, 1));         scrolledcomposite.setexpandhorizontal(true);         scrolledcomposite.setexpandvertical(true);         //scrolledcomposite.setalwaysshowscrollbars(true);         {             final composite composite = new composite(scrolledcomposite, swt.none);             composite.setlayout(new gridlayout(2, false));             {                 final button btn1 = new button(composite, swt.none);                 btn1.settext("button 1");                  final button btn2 = new button(composite, swt.none);                 btn2.settext("button 2");             }              scrolledcomposite.setcontent(composite);             scrolledcomposite.setminsize(composite.computesize(swt.default, swt.default));         }          pack();     }      public static void main(final string[] args)     {         final display display = new display();          final shell shell = new shell(display);         shell.settext("testcase");         shell.setlayout(new filllayout());          new scrollbarspaceissue(shell, swt.none);          shell.pack();         shell.open();          while (!shell.isdisposed()) {             if (!display.readanddispatch())                 display.sleep();         }         display.dispose();     } }

the reason why there "wasted space" preferred size of scrolledcomposite object includes room scrollbars, whether visible or not. disable default functionality, can override preferred size calculation extending scrolledcomposite such:

class packedscrolledcomposite extends scrolledcomposite {     point scrollbarsize;  // size of os-specific scrollbar      public packedscrolledcomposite(composite parent, int style)     {         super(parent, style);          composite composite = new composite(parent, swt.h_scroll | swt.v_scroll);         composite.setsize(1, 1);         scrollbarsize = composite.computesize(0, 0);         composite.dispose();     }      public point computesize(int whint, int hhint, boolean changed)     {         point point = super.computesize(whint, hhint, changed);         point.x += ((getstyle() & swt.v_scroll) != 0) ? -scrollbarsize.x : 0;         point.y += ((getstyle() & swt.h_scroll) != 0) ? -scrollbarsize.y : 0;          return point;     } }

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