Archived:Create progress dialog using QProgressDialog

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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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Code Example

Source file: Media:QtProgressDialog.zip

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Tested with

Devices(s): Nokia 5800

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Compatibility

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

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Platform Security

Signing Required: Self-Signed

Capabilities: None

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Article

Keywords: QProgressDialog

Created: savaj (06 Jun 2009)

Last edited: hamishwillee (11 Oct 2012)

Overview

This code snippet shows how to use the QProgressDialog class to provide feedback on the progress of a slow operation. Note that the QProgressDialog is similar to QProgressBar, but additionally gives users to opportunity to abort the operation - see How to use QProgressBar in Qt.

Source code

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    ProgressDialog w;
    w.showMaximized();
 
 
    QVBoxLayout* layout = new QVBoxLayout;
	QWidget*  win = new QWidget;
 
	//The minimum and maximum is the number of steps in the operation for which this progress dialog shows progress.
    //for example here 0 and 100.
	QProgressDialog* progress = new QProgressDialog("Fetching data...", "Cancel", 0, 100);
	//Set dialog as modal dialog, if you want.
	progress->setWindowModality(Qt::WindowModal);
 
	layout->addWidget(progress,Qt::AlignCenter);
	win->setLayout(layout);
 
	for (int i = 0; i < 100; i++)
	{
	//set progress value.
	progress->setValue(i);
	win->show();
 
	//if user click cancel button of dialog.
	if (progress->wasCanceled())
		 break;
	}
 
	progress->setValue(100);
	win->show();
 
    return a.exec();
}

Other useful methods of QProgressDialog

Slot cancel() resets the progress dialog. Signal canceled() is emitted when the cancel button is clicked. It is connected to the cancel() slot by default.

Postconditions

The code snippet is expected to show a progress dialog with cancel button, as shown in below image.

Code Example

• Download the working Code Example.