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Detecting focus lost & gained events in Qt for Symbian

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m (Text replace - "<code cpp>" to "<code cpp-qt>")
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[[Category:Qt]][[Category:Symbian]][[Category:UI]]
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[[Category:Qt]][[Category:Symbian]][[Category:UI]][[Category:S60 3rd Edition FP1]][[Category:S60 3rd Edition FP2]][[Category:S60 5th Edition]][[Category:Symbian C++]]
__NOTOC__
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{{ArticleMetaData <!-- v1.2 -->
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{{KBTS}}
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{{ArticleMetaData
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|id=TSQ001585
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|platform=S60 3rd Edition, FP1<br>S60 3rd Edition, FP2<br>S60 5th Edition<br>Qt 4.6.2
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|devices=S60
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|category=Qt
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|subcategory=UI
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|creationdate=26 April, 2010
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|keywords=symbianEventFilter, focus
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|sourcecode= <!-- Link to example source code (e.g. [[Media:The Code Example ZIP.zip]]) -->
 
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|installfile= <!-- Link to installation file (e.g. [[Media:The Installation File.sis]]) -->
|sdk=<!-- SDK(s) built and tested against (e.g. [http://linktosdkdownload/ Nokia Qt SDK 1.1]) -->
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|devices= Symbian
|devicecompatability=<!-- Compatible devices (e.g.: All* (must have GPS) ) -->
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|sdk= <!-- SDK(s) built and tested against (e.g. [http://linktosdkdownload/ Nokia Qt SDK 1.1]) -->
|signing=<!-- Empty or one of Self-Signed, DevCert, Manufacturer -->
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|platform= S60 3rd Edition, FP1<br>S60 3rd Edition, FP2<br>S60 5th Edition<br>Qt 4.6.2
|capabilities=<!-- Capabilities required (e.g. Location, NetworkServices.) -->
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|devicecompatability= <!-- Compatible devices (e.g.: All* (must have GPS) ) -->
|author=[[User:Kbwiki]]
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|signing= <!-- Empty or one of Self-Signed, DevCert, Manufacturer -->
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|capabilities= <!-- Capabilities required by the article/code example (e.g. Location, NetworkServices. -->
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|keywords= symbianEventFilter, focus
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}}
 
}}
  
 
==Overview==
 
==Overview==
  
{{Abstract|visible=true|This article explains how to detect focus change events in Qt applications on Symbian.}}
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{{Abstract|This article explains how to detect focus change events in Qt applications on Symbian.}}
  
 
==Description==
 
==Description==
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Define an application class that inherits {{Icode|QApplication}} and reimplement {{Icode|symbianEventFilter()}}:
 
Define an application class that inherits {{Icode|QApplication}} and reimplement {{Icode|symbianEventFilter()}}:
  
<code cpp>
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<code cpp-qt>
 
   #include <QDebug>
 
   #include <QDebug>
 
    
 
    
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   };
 
   };
 
</code>
 
</code>
[[Category:Technical Solution]][[Category:S60 3rd Edition, Feature Pack 1]][[Category:S60 3rd Edition, Feature Pack 2]][[Category:S60 5th Edition]]
 

Revision as of 04:16, 11 October 2012

Article Metadata
Tested with
Devices(s): Symbian
Compatibility
Platform(s): S60 3rd Edition, FP1
S60 3rd Edition, FP2
S60 5th Edition
Qt 4.6.2
S60 5th Edition
S60 3rd Edition FP2
S60 3rd Edition FP1
Article
Keywords: symbianEventFilter, focus
Created: User:Kbwiki (26 Apr 2014)
Last edited: hamishwillee (11 Oct 2012)

Overview

This article explains how to detect focus change events in Qt applications on Symbian.

Description

Qt applications need to reimplement QApplication::symbianEventFilter() in order to get notification of foreground application changes, ie. focus lost & gained events. This is needed because focusInEvent(), focusOutEvent(), or hideEvent() from the QWidget class are not called on the Symbian platform when the foreground application changes.

Solution

Define an application class that inherits QApplication and reimplement symbianEventFilter():

  #include <QDebug>
 
#ifdef Q_OS_SYMBIAN
#include <QSymbianEvent>
#include <w32std.h>
#endif
 
 
class MyApplication : public QApplication
{
public:
MyApplication( int argc, char** argv ) : QApplication( argc, argv ) {}
 
#ifdef Q_OS_SYMBIAN
protected:
bool symbianEventFilter( const QSymbianEvent* symbianEvent ) {
const TWsEvent *event = symbianEvent->windowServerEvent();
 
if( !event ) {
return false;
}
 
switch( event->Type() ) {
case EEventFocusGained: {
qDebug() << "Focus gained";
break;
}
case EEventFocusLost: {
qDebug() << "Focus lost";
break;
}
default:
break;
}
 
// Always return false so we don't stop
// the event from being processed
return false;
}
#endif // Q_OS_SYMBIAN
};
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