From Forum Nokia Wiki

ID	CS001437	Creation date	June 18, 2009
Platform	S60 3rd Edition, FP1, FP2 S60 5th Edition	Tested on devices	Nokia 5800 XpressMusic
Category	Qt for Symbian	Subcategory	UI

Keywords (APIs, classes, methods, functions): QWidget::resizeEvent(), QMainWindow::resizeEvent()

Overview

This code snippet demonstrates how to listen for screen or layout orientation changes. When using Qt layout managers, they handle the layout changes and you generally do not need to worry about them.

On custom UI applications that do not use layout managers, you have to handle screen orientation and size changes by implementing a virtual QWidget::resizeEvent().

The event handler resizeEvent() of the base class QWidget is called whenever the user changes the screen mode. This event handler can be reimplemented in a subclass to receive widget resize events which are passed in the event parameter. QMainWindow is a subclass of QWidget and it contains resizeEvent() as well, so you can also get the resize event from QMainWindow if you implement it in your application.

This snippet can be self-signed.

Preconditions

• Download Qt for S60 release from here:
• Install latest Qt for S60 see Qt for S60 - Installation packages
• Check this link for installation guide: How to install the package.
• Go through this article: Getting started with Qt for S60

Source

Solution 1: Requesting the new size from QResizeEvent

void QMyWidget::resizeEvent (QResizeEvent* event)
    {
    QSize widgetSize = event->size();
    // TODO: You have new size of the screen
    // do your new layout
 
    // Call base class impl
    QWidget::resizeEvent(event);
    }

Solution 2: Requesting the new size from QMainWindow's central widget

void QMyMainWindow::resizeEvent (QResizeEvent* event)
    {
    QSize widgetSize = centralWidget()->size();
    // TODO: You have new size of the screen
    // do your new layout
 
    // Call base class impl
    QMainWindow::resizeEvent(event);
    }

See also

CS001308 - Implementing a layout manager in Qt

Dynamic Layout handling with QWidget

Postconditions

Layout orientation and size change are handled. You will get a notification when the user changes the screen mode.