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Archived:Load, Resize image and set background image in Qt application/widget

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Archived.pngArchived: This article is archived because it is not considered relevant for third-party developers creating commercial solutions today. If you think this article is still relevant, let us know by adding the template {{ReviewForRemovalFromArchive|user=~~~~|write your reason here}}.

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
Code ExampleTested with
Devices(s): Nokia 5800 XpressMusic
Compatibility
Platform(s): Qt
Symbian
Article
Keywords: QWidget::setPalette(), QPalette::setBrush, QPixmap(),QPixmap::scaled()
Created: savaj (11 Jun 2009)
Last edited: hamishwillee (11 Oct 2012)

Contents

Overview

This code snippets shows how to load image, resize image and set image in background of widget/application. The API QPixmap() will load image using file name. API QPixmap::scaled() will returns a copy of the pixmap scaled to a rectangle with the given width and height. QPalette::setBrush() sets the brush for the given color role (here background) to the specified brush (here image)for all groups in the palette. QWidget::setPalette() set a given palette for a Widget.

This snippet can be self-signed. As it does not use any API which require developer/certified signing.

Headers required

#include <QPalette>
#include <QDesktopWidget>

Source

void SetBackground::SetBackgroundImage()
{
//Using QPalette you can set background image as follows.
QPalette p = palette();
 
//Load image to QPixmap, Give full path of image
QPixmap pixmap1("c://01.JPG"); //For emulator C: is ..\epoc32\winscw\c so image must be at that location
 
//resize image if it is larger than screen size.
QDesktopWidget* desktopWidget = QApplication::desktop();
QRect rect = desktopWidget->availableGeometry();
 
QSize size(rect.width() , rect.height());
//resize as per your requirement..
QPixmap pixmap(pixmap1.scaled(size));
 
p.setBrush(QPalette::Background, pixmap);
setPalette(p);
}


Postconditions

The code snippet is expected to show background image in application.

BackImage.JPG

Code Example

  • The Code Example will set image in background and example is tested on Nokia 5800 XpressMusic.
This page was last modified on 11 October 2012, at 01:14.
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