Go back to Richel Bilderbeek's homepage.

Go back to Richel Bilderbeek's C++ page.

 

 

 

 

 

(C++) QtExample10

 

QtQt CreatorLubuntuUbuntu

 

This Qt example shows how to change a QLabel when a QDialog is resized, like this screenshot (png).

 

Technical facts

 

Application type(s)

Operating system(s) or programming environment(s)

IDE(s):

Project type:

C++ standard:

Compiler(s):

Libraries used:

 

 

 

 

 

Qt project file: ./CppQtExample10/CppQtExample10.pro

 

exists(../../DesktopApplication.pri) {
  include(../../DesktopApplication.pri)
}
!exists(../../DesktopApplication.pri) {
  QT += core gui
  greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
  TEMPLATE = app

  CONFIG(debug, debug|release) {
    message(Debug mode)
  }

  CONFIG(release, debug|release) {
    message(Release mode)
    DEFINES += NDEBUG NTRACE_BILDERBIKKEL
  }

  QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra

  unix {
    QMAKE_CXXFLAGS += -Werror
  }
}

exists(../../Libraries/Boost.pri) {
  include(../../Libraries/Boost.pri)
}
!exists(../../Libraries/Boost.pri) {
  win32 {
    INCLUDEPATH += \
      ../../../Projects/Libraries/boost_1_55_0
  }
}

SOURCES += main.cpp

SOURCES += dialog.cpp
HEADERS += dialog.h
FORMS   += dialog.ui

 

 

 

 

 

./CppQtExample10/dialog.h

 

#ifndef DIALOG_H
#define DIALOG_H

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Weffc++"
#pragma GCC diagnostic ignored "-Wunused-local-typedefs"
#include <QDialog>
#pragma GCC diagnostic pop

namespace Ui {
  class Dialog;
}

class Dialog : public QDialog
{
  Q_OBJECT

public:
  explicit Dialog(QWidget *parent = 0);
  Dialog(const Dialog&) = delete;
  Dialog& operator=(const Dialog&) = delete;
  ~Dialog();

protected:
  void resizeEvent(QResizeEvent *e); //Added

private:
  Ui::Dialog *ui;
};

#endif // DIALOG_H

 

 

 

 

 

./CppQtExample10/dialog.cpp

 

#include "dialog.h"
#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
  ui->setupUi(this);
}

Dialog::~Dialog()
{
  delete ui;
}

//Added
void Dialog::resizeEvent(QResizeEvent*)
{
  static int n_times = 0;
  QString s; s = s.number(n_times);
  ui->label->setText("Resized " + s + " times");
  ++n_times;
}

 

 

 

 

 

./CppQtExample10/main.cpp

 

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Weffc++"
#pragma GCC diagnostic ignored "-Wunused-local-typedefs"
#include <QApplication>
#include "dialog.h"
#pragma GCC diagnostic pop

int main(int argc, char *argv[])
{
  QApplication a(argc, argv);
  Dialog w;
  w.show();
  return a.exec();
}

 

 

 

 

 

Go back to Richel Bilderbeek's C++ page.

Go back to Richel Bilderbeek's homepage.

 

Valid XHTML 1.0 Strict

This page has been created by the tool CodeToHtml