Technical facts

Operating system(s) or programming environment(s)

Lubuntu 15.04 (vivid)

IDE(s):

Qt Creator 3.1.1

Project type:

Console application

C++ standard:

C++98

Compiler(s):

G++ 4.9.2

Libraries used:

STL: GNU ISO C++ Library, version 4.9.2

Qt project file: ./CppQListWidgetExample4/CppQListWidgetExample4.pro


include(../../DesktopApplication.pri) #Or use the code below

#

# QT       += core gui

# greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

#

# win32 {

#   greaterThan(QT_MAJOR_VERSION, 4): QT += svg

# }

#

# 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 -Weffc++

#

# unix {

#   QMAKE_CXXFLAGS += -Werror

# }







SOURCES += \

  main.cpp \

  dialog.cpp \

  qtautoresizelistwidget.cpp



HEADERS  += \

  dialog.h \

  qtautoresizelistwidget.h



FORMS += dialog.ui

./CppQListWidgetExample4/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();



private slots:

  void on_pushButton_clicked();



private:

  Ui::Dialog *ui;

};



#endif // DIALOG_H

./CppQListWidgetExample4/dialog.cpp


#include "dialog.h"



#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#pragma GCC diagnostic ignored "-Wunused-local-typedefs"

#include <QScrollBar>

#include <QTimer>



#include "ui_dialog.h"

#pragma GCC diagnostic pop



Dialog::Dialog(QWidget *parent) :

  QDialog(parent),

  ui(new Ui::Dialog)

{

  ui->setupUi(this);

  ui->listWidget->setAlternatingRowColors(true);

  ui->listWidget->setWordWrap(true);

}



Dialog::~Dialog()

{

  delete ui;

}



void Dialog::on_pushButton_clicked()

{

  QListWidgetItem * const item = new QListWidgetItem;

  item->setText("0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789");

  ui->listWidget->addItem(item);

}

./CppQListWidgetExample4/main.cpp


#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#pragma GCC diagnostic ignored "-Wunused-local-typedefs"

#include "dialog.h"

#include <QApplication>

#pragma GCC diagnostic pop



int main(int argc, char *argv[])

{

  QApplication a(argc, argv);

  Dialog w;

  w.show();

  return a.exec();

}

./CppQListWidgetExample4/qtautoresizelistwidget.h


#ifndef QTAUTORESIZELISTWIDGET_H

#define QTAUTORESIZELISTWIDGET_H



#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#pragma GCC diagnostic ignored "-Wunused-local-typedefs"

#include <QListWidget>

#pragma GCC diagnostic pop



struct QtAutoResizeListWidget : public QListWidget

{

  QtAutoResizeListWidget(QWidget *parent = 0);

  QtAutoResizeListWidget(const QtAutoResizeListWidget&) = delete;

  QtAutoResizeListWidget& operator=(const QtAutoResizeListWidget&) = delete;

  void addItem(QListWidgetItem *item);



  private:

  QTimer * const m_timer;



  void OnTimer();

};



#endif // QTAUTORESIZELISTWIDGET_H

./CppQListWidgetExample4/qtautoresizelistwidget.cpp


#include "qtautoresizelistwidget.h"



#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#pragma GCC diagnostic ignored "-Wunused-local-typedefs"

#include <QObject>

#include <QScrollBar>

#include <QTimer>

#pragma GCC diagnostic pop



QtAutoResizeListWidget::QtAutoResizeListWidget(QWidget *parent)

  : QListWidget(parent),

    m_timer(new QTimer)

{

  QObject::connect(m_timer,&QTimer::timeout,this,&QtAutoResizeListWidget::OnTimer);

  m_timer->setInterval(1);

  m_timer->start();

}



void QtAutoResizeListWidget::addItem(QListWidgetItem *item)

{



  QListWidget::addItem(item);

  this->repaint();

  m_timer->start();

}



void QtAutoResizeListWidget::OnTimer()

{

  if (this->verticalScrollBar()->isVisible())

  {

    const int height = this->height();

    this->setMinimumHeight(height + 1);

  }

  else

  {

    m_timer->stop();

  }

}

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(C++) QListWidgetExample4

Technical facts

Qt project file: ./CppQListWidgetExample4/CppQListWidgetExample4.pro

./CppQListWidgetExample4/dialog.h

./CppQListWidgetExample4/dialog.cpp

./CppQListWidgetExample4/main.cpp

./CppQListWidgetExample4/qtautoresizelistwidget.h

./CppQListWidgetExample4/qtautoresizelistwidget.cpp