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Archived:Calculating text width in Qt

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m (Removed protection from "CS001349 - Calculating text width in Qt": Merging into Wiki)
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[[Category:Qt C++ UI]][[Category:UI]]
 
[[Category:Qt C++ UI]][[Category:UI]]
 
{{ArticleMetaData <!-- v1.2 -->
 
{{ArticleMetaData <!-- v1.2 -->
|sourcecode= [[Media:HelloworldNew.zip]]  
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|sourcecode= [[Media:HelloworldNew.zip]]
 
|installfile= <!-- Link to installation file (e.g. [[Media:The Installation File.sis]]) -->
 
|installfile= <!-- Link to installation file (e.g. [[Media:The Installation File.sis]]) -->
 
|devices= Nokia 5800 XpressMusic
 
|devices= Nokia 5800 XpressMusic
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*'''This source code centers the text and sets the text colour.'''
 
*'''This source code centers the text and sets the text colour.'''
  
<code cpp>
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<code cpp-qt>
 
void QMyWidget::paintEvent(QPaintEvent*)
 
void QMyWidget::paintEvent(QPaintEvent*)
 
     {
 
     {
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  [[Category:Code Examples]][[Category:Code Snippet]][[Category:MeeGo]] [[Category:Symbian]]
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  [[Category:Code Examples]][[Category:Code Snippet]][[Category:MeeGo Harmattan]] [[Category:Symbian]]

Latest revision as of 04:13, 11 October 2012

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 (using C++ for the Qt app UI) is deprecated.

Article Metadata
Code ExampleTested with
Devices(s): Nokia 5800 XpressMusic
Compatibility
Platform(s): S60 3rd Edition, FP1, FP2
S60 5th Edition
Symbian
Article
Keywords: QFontMetrics, QFont
Created: tepaa (26 Mar 2009)
Last edited: hamishwillee (11 Oct 2012)

Contents

[edit] Overview

This code snippets shows how to use the QFont and QFontMetrics classes to draw a string into the center of the screen and to get the string height and width in pixels.

[edit] Preconditions

[edit] Source code

  • This source code centers the text and sets the text colour.
void QMyWidget::paintEvent(QPaintEvent*)
{
QPainter painter(this);
 
// Create font
QFont f("Helvetica",20);
// Set current font
painter.setFont(f);
// Set font color
painter.setPen(Qt::white);
// Get QFontMetrics reference
QFontMetrics fm = painter.fontMetrics();
 
QString text = "helloworld";
 
// Calculate text center position into the screen using QFontMetrics class
QPoint center = QPoint( ( width()-fm.width(text))/2,
( height() - fm.height())/2 );
 
// QFontMetrics::width() gives calculated text width with current QFont in QPainter
// QFontMetrics::height() gives text height
 
painter.drawText(center,text);
}


[edit] Postconditions

The text is centered on the screen.

The code example can be found at File:HelloworldNew.zip

This page was last modified on 11 October 2012, at 04:13.
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