Scroll bars in scroll area not comming in scroll area

[aurora26]

i created scroll area using designer and adding line edit in run time, when button clicked….
But scroll area is not expanding(scroll bars are inactive even though i set scrollbarAlways on)
please help me…
here is my complete code..
mainwindow.h

   #ifndef MAINWINDOW_H
    #define MAINWINDOW_H
     
    #include <QMainWindow>
     
    namespace Ui {
        class MainWindow;
    }
     
    class MainWindow : public QMainWindow
    {
        Q_OBJECT
     
    public:
        explicit MainWindow(QWidget *parent = 0);
        ~MainWindow();
     
    private slots:
        void on_pushButton_clicked();
     
    private:
        Ui::MainWindow *ui;
    };
     
    #endif // MAINWINDOW_H

mainwindow.cpp

    #include "mainwindow.h"
    #include "ui_mainwindow.h"
     
    MainWindow::MainWindow(QWidget *parent) :
        QMainWindow(parent),
        ui(new Ui::MainWindow)
    {
        ui->setupUi(this);
     
     
     
    }
     
    MainWindow::~MainWindow()
    {
        delete ui;
    }
     
     
     
    void MainWindow::on_pushButton_clicked()
    {
        QLineEdit *le=new QLineEdit;
     
       ui->gridLayout->addWidget(le);
     
     
    ui->scrollArea->setWidgetResizable(true);
     
    }

mainwindow.ui

    <?xml version="1.0" encoding="UTF-8"?>
    <ui version="4.0">
     <class>MainWindow</class>
     <widget class="QMainWindow" name="MainWindow">
      <property name="geometry">
       <rect>
        <x>0</x>
        <y>0</y>
        <width>400</width>
        <height>300</height>
       </rect>
      </property>
      <property name="windowTitle">
       <string>MainWindow</string>
      </property>
      <widget class="QWidget" name="centralWidget">
       <layout class="QVBoxLayout" name="verticalLayout">
        <property name="sizeConstraint">
         <enum>QLayout::SetMinAndMaxSize</enum>
        </property>
        <item>
         <widget class="QScrollArea" name="scrollArea">
          <property name="widgetResizable">
           <bool>true</bool>
          </property>
          <widget class="QWidget" name="scrollAreaWidgetContents">
           <property name="geometry">
            <rect>
             <x>0</x>
             <y>0</y>
             <width>380</width>
             <height>198</height>
            </rect>
           </property>
           <widget class="QWidget" name="">
            <property name="geometry">
             <rect>
              <x>40</x>
              <y>31</y>
              <width>216</width>
              <height>25</height>
             </rect>
            </property>
            <layout class="QGridLayout" name="gridLayout">
             <property name="sizeConstraint">
              <enum>QLayout::SetMinAndMaxSize</enum>
             </property>
             <item row="0" column="0">
              <widget class="QPushButton" name="pushButton_2">
               <property name="text">
                <string>PushButton</string>
               </property>
              </widget>
             </item>
             <item row="0" column="1">
              <widget class="QLineEdit" name="lineEdit"/>
             </item>
            </layout>
           </widget>
          </widget>
         </widget>
        </item>
        <item>
         <widget class="QPushButton" name="pushButton">
          <property name="text">
           <string>PushButton</string>
          </property>
         </widget>
        </item>
       </layout>
      </widget>
      <widget class="QMenuBar" name="menuBar">
       <property name="geometry">
        <rect>
         <x>0</x>
         <y>0</y>
         <width>400</width>
         <height>21</height>
        </rect>
       </property>
      </widget>
      <widget class="QToolBar" name="mainToolBar">
       <attribute name="toolBarArea">
        <enum>TopToolBarArea</enum>
       </attribute>
       <attribute name="toolBarBreak">
        <bool>false</bool>
       </attribute>
      </widget>
      <widget class="QStatusBar" name="statusBar"/>
     </widget>
     <layoutdefault spacing="6" margin="11"/>
     <resources/>
     <connections/>
    </ui>

[gnuton]

Hi,
code looks okay to me. Gridview is the layout of the scrollbar central widget and that's okay.
You don't see the bars because the central widget has the same size of the scrollarea in runtime.
The bars are shown when the central widget becomes bigger u size than the scrollarea.
You could try this just setting a minimum size (0x0 by default) to the central widget using designer.