(C++) QtExample10

 

 

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

 

• Download the Qt Project of 'QtExample10' (zip)

Technical facts

 

Application type(s)

• Desktop application

Operating system(s) or programming environment(s)

• Lubuntu 15.04 (vivid)

IDE(s):

• Qt Creator 3.1.1

Project type:

• GUI application

C++ standard:

• C++11

Compiler(s):

• G++ 4.9.2

Libraries used:

• Qt: version 5.4.1 (32 bit)
• STL: GNU ISO C++ Library, version 4.9.2

 

 

 

 

 

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(); }