Archived:Calculating text width in Qt
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{{CodeSnippet | {{CodeSnippet | ||
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|platform=S60 3rd Edition, FP1, FP2<br>S60 5th Edition | |platform=S60 3rd Edition, FP1, FP2<br>S60 5th Edition | ||
|devices=Nokia 5800 XpressMusic | |devices=Nokia 5800 XpressMusic | ||
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|subcategory=UI | |subcategory=UI | ||
|creationdate=April 29, 2009 | |creationdate=April 29, 2009 | ||
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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. | 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. | ||
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==Preconditions== | ==Preconditions== | ||
| − | * Install | + | * Install [[Nokia Qt SDK]] |
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==Source code== | ==Source code== | ||
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Revision as of 09:56, 4 April 2011
Article Metadata
Tested with
Devices(s): Nokia 5800 XpressMusic
Compatibility
Platform(s): S60 3rd Edition, FP1, FP2
S60 5th Edition
S60 5th Edition
Article
Keywords: QFontMetrics, QFont
Created: (29 Apr 2009)
Last edited: hamishwillee
(04 Apr 2011)
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.
Preconditions
- Install Nokia Qt SDK
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);
}
Postconditions
The text is centered on the screen.
The code example can be found at File:HelloworldNew.zip
