Archived:How to use QComboBox in Qt

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14 Sep
2009

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22 Sep
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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.

This code snippet demonstrates how to use QComboBox and how to connect it with some event in Qt.

QComboBox *combo=new QComboBox();

Article Metadata

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Code Example

Source file: Media:combobox.zip

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Tested with

Devices(s): Symbian emulator

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Compatibility

Platform(s): Qt

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Platform Security

Signing Required: Self-Signed

Capabilities: None

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Article

Keywords: QComboBox, Push Button, Text Label

Created: james1980 (06 Jan 2009)

Last edited: hamishwillee (11 Oct 2012)

Various Function

• This function holds to add the item in the ComboBox in string format.

combo->additem("X");
combo->addItem("Y");

• To set the size of the ComboBox items. If you set the maximum number to be less then the current amount of items in the ComboBox, the extra items will be truncated.

combo->setMaxCount(5);

• To remove the Item form the ComboBox removeItem(int index) at a given index.

combo->removeItem(5);

Source File

#include <QApplication>
#include <QPushButton>
#include <QComboBox>
#include <QLabel>
#include <QVBoxLayout>
#include <QWidget>
#include <QString>
int main(int argc, char *argv[])
{
	QApplication app(argc, argv);
	QWidget *win =new QWidget;
	QVBoxLayout *layout = new QVBoxLayout;
	QComboBox *combo = new QComboBox();
	QLabel *label = new QLabel("hello");
	QPushButton *helloButton = new QPushButton("Show Label");
	combo->addItem("A");
	combo->addItem("B");
	combo->addItem("C");
	QObject::connect(combo, SIGNAL(activated(int)),label, SLOT(hide()));
	QObject::connect(helloButton, SIGNAL(clicked()),label, SLOT(show()));
	layout->addWidget(label);
	layout->addWidget(combo);
	layout->addWidget(helloButton);
 
	win->setLayout(layout);
	win->showMaximized();
	return app.exec();
}

ScreenShot

• Before clicking the combo

• After Clicking the combo

• Download working example here : combobox.zip