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Archived:Calculating text width in Qt

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Forum Nokia KB (Talk | contribs)
Forum Nokia KB (Talk | contribs)
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{{CodeSnippet
 
{{CodeSnippet
|id=  
+
|id=CS001349
|platform=S60 3rd Edition, FP1, FP2, S60 5th Edition
+
|platform=S60 3rd Edition, FP1, FP2<br>S60 5th Edition
|devices=5800 XpressMusic
+
|devices=Nokia 5800 XpressMusic
 
|category=Qt for S60
 
|category=Qt for S60
 
|subcategory=UI
 
|subcategory=UI
|creationdate=March 26, 2009
+
|creationdate=April 29, 2009
 
|keywords=QFontMetrics, QFont
 
|keywords=QFontMetrics, QFont
 
}}
 
}}
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==Overview==
 
==Overview==
  
This code snippets shows how to use QFont and QFontMetrics classes to draw string into center of the screen and to get string height and width as pixels.
+
This code snippets shows how to use the <tt>QFont</tt> and <tt>QFontMetrics</tt> classes to draw a string into the center of the screen and to get the string height and width in pixels.
  
 
'''Note''': In order to use this code, you need to have Qt for S60 installed on your platform.
 
'''Note''': In order to use this code, you need to have Qt for S60 installed on your platform.
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==Preconditions==
 
==Preconditions==
  
* Install Qt for S60 Garden release from here: [http://pepper.troll.no/s60prereleases/ Qt for S60 "Garden" pre-release]
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* Install the Qt for S60 Garden release from here: [http://pepper.troll.no/s60prereleases/ Qt for S60 "Garden" pre-release]
* Check this link for installation guide: [http://pepper.troll.no/s60prereleases/doc/install-s60.html How to install the package]
+
* Check the installation guide: [http://pepper.troll.no/s60prereleases/doc/install-s60.html How to install the package]
  
 
==Source code==
 
==Source code==
*'''This source code is use to set the text in center as well as to color the text.'''
+
*'''This source code centers the text and sets the text colour.'''
  
 
<code cpp>
 
<code cpp>
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==Postconditions==
 
==Postconditions==
Text is screen center.
+
The text is centered on the screen.
  
  
 
[[Category:Qt]][[Category:Qt for S60]][[Category:Code Examples]][[Category:UI]]
 
[[Category:Qt]][[Category:Qt for S60]][[Category:Code Examples]][[Category:UI]]

Revision as of 13:50, 29 April 2009

Article Metadata
Tested with
Devices(s): Nokia 5800 XpressMusic
Compatibility
Platform(s): S60 3rd Edition, FP1, FP2
S60 5th Edition
Symbian
Article
Keywords: QFontMetrics, QFont
Created: (29 Apr 2009)
Last edited: Forum Nokia KB (29 Apr 2009)

Contents

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.

Note: In order to use this code, you need to have Qt for S60 installed on your platform.


Preconditions

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",6);
// 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((widgetSize.width()-fm.width(text))/2,
fm.height());
 
// QFontMetrics::width() gives calculated text width with current QFont in QPainter
// QFontMetrics::height() gives text height
 
painter.drawText(center,text);
}


Postconditions

The text is centered on the screen.

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