c++ - Adjusting QLineEdit's default width -

i'm trying hand @ writing sudoku solver, trying achieve input of sudoku grid of 9 9 qlineedit fields.

the grid constructed using grid of 9 qframes each hold grid of 9 subclassed qlineedit widgets.

the problem facing cannot find way change default size of qlineedit widgets 25px 25px without constraining them scaling setting fixed size. have tried resize() function , subclassing qlineedit class in order reimplement sizehint(), can't seem find way adjust initial width of these widgets.

anyone can me out?

below 2 pictures: first of window appears , second 1 how want appear (= same window, after having resized width minimum).

here code: sudokufield.h

#ifndef sudokufield_h #define sudokufield_h #include <qlineedit>  class sudokufield : public qlineedit {     q_object public:     explicit sudokufield(qwidget *parent = 0);     qsize sizehint(); };  #endif // sudokufield_h 

sudokufield.cpp

#include <qtgui> #include "sudokufield.h" sudokufield::sudokufield(qwidget *parent) :     qlineedit(parent) {     setminimumsize(25, 25);     setframe(false);     setstylesheet(qstring("border: 1px solid gray"));     setsizepolicy(qsizepolicy::expanding, qsizepolicy::expanding);     setvalidator(new qintvalidator(1,9,this));     //resize(25,25); }  qsize sudokufield::sizehint(){     return qsize(minimumwidth(), minimumheight()); } 

mainwindow.cpp

#include <qtgui> #include "mainwindow.h" #include "sudokufield.h"  mainwindow::mainwindow(qwidget *parent) :     qmainwindow(parent) {     qgridlayout *fullgrid = new qgridlayout;     fullgrid->setspacing(0);      //construct 9 big boxes     for(int row(0); row < 3; row++)         for(int column(0); column < 3; column++) {             qframe *boxframe = new qframe(this);             boxframe->setframestyle(qframe::box);             boxframe->setlinewidth(1);              qgridlayout *boxgrid = new qgridlayout;             boxgrid->setmargin(0);             boxgrid->setspacing(0);              //put 9 subclassed qlineedit widgets in each box             for(int boxrow(0); boxrow < 3; boxrow++)                 for(int boxcolumn(0); boxcolumn < 3; boxcolumn++){                     sudokufield *field = new sudokufield(this);                     boxgrid->addwidget(field, boxrow, boxcolumn);                 }             boxframe->setlayout(boxgrid);             fullgrid->addwidget(boxframe, row, column);         }      //add 1px outer border     qframe *fullframe = new qframe(this);     fullframe->setlinewidth(1);     fullframe->setlayout(fullgrid);      setcentralwidget(fullframe);     setwindowtitle("sudoku"); } 

to fixed size of qlineedit must set sizepolicy qlineedit qsizepolicy::fixed, the qwidget::sizehint() acceptable alternative, widget can never grow or shrink (e.g. vertical direction of push button).

take @ variant of sizepolicy: http://qt-project.org/doc/qt-5/qsizepolicy.html#policy-enum.

also, take @ useful , well-wrote book jasmin blanchette , mark summerfield c++ gui programming qt4 , section layout management.