Archived:How to use QDoubleSpinBox

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Qt Quick should be used for all UI development on mobile devices. The approach described in this article (based on QWidget) is deprecated.

Article Metadata

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Tested with

Devices(s): Qt Creator IDE & S60 Emulator

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Compatibility

Platform(s): S60 3rd Edition FP1, S60 3rd Edition FP2, S60 5th Edition

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Article

Keywords: QDoubleSpinBox

Created: mind_freak (14 Mar 2009)

Last edited: hamishwillee (11 Oct 2012)

Introduction

This article shows how to use QDoubleSpinBox, a spin box that takes doubles. The widget allows the user to choose a value by clicking the up and down buttons or by pressing Up or Down on the keyboard to increase or decrease the value currently displayed. The user can also type the value in manually.

Note: QDoubleSpinBox will round numbers so they can be displayed with the current precision. In a QDoubleSpinBox with decimals set to 2, calling setValue(2.555) will cause value() to return 2.5.

New Feature

• Most spin boxes are directional, but QSpinBox can also operate as a circular spin box.
• This Spin Box support floating point value.

Preconditions

• Download and install the [[Qt SDK]

Various Function

• To make this spin Box Circular.

doubleSpin->setWrapping(1);

• This property holds the step value.

doubleSpin->setSingleStep(0.1);

• This property holds the suffix of the spin box.

doubleSpin->setSuffix(" km");

Source Code

#include <QtGui/QApplication>
#include "doublespindialog.h"
#include<QWidget>
#include<QHBoxLayout>
#include<QDoubleSpinBox>
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QWidget *win=new QWidget();
    QHBoxLayout *lay=new QHBoxLayout();
    QDoubleSpinBox *doubleSpin=new QDoubleSpinBox();
    doubleSpin->setMinimum(0.0);
    doubleSpin->setMaximum(100.0);
    doubleSpin->setWrapping(1);
    doubleSpin->setSingleStep(0.1);
    lay->addWidget(doubleSpin);
    win->setLayout(lay);
    win->showMaximized();
    win->setStyleSheet("* { background-color:rgb(150,147,88); padding: 7px ; color:rgb(255,255,255)}");
    return a.exec();
}

Screenshot