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
Code:
   #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

Code:
    #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
Code:
    <?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>