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Revision as of 09:10, 13 June 2012 by hamishwillee (Talk | contribs)

Showing a global message query using CAknGlobalMsgQuery

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Article Metadata
Tested with
Devices(s): Nokia N93
Compatibility
Platform(s): S60 3rd Edition, FP1
Article
Keywords: CAknGlobalMsgQuery, StringLoader, CAknGlobalMsgQuery::NewL(), CAknGlobalMsgQuery::ShowMsgQueryL(), StringLoader::LoadLC()
Created: aknyman (13 Jun 2008)
Last edited: hamishwillee (13 Jun 2012)

Contents

Overview

This code snippet shows how to create a global message query CAknGlobalMsgQuery. A global message query is constructed by calling the NewL() method and is executed using the ShowMsgQueryL() method. An active object has to be constructed to handle the dismissal of the dialog. This example uses the generic class CGlobalQueryHandlerAO that is also used with other global query code snippets. The class CGlobalQueryContainer is used to launch the query and it is also the observer that implements the interface MGlobalQueryObserver.

This snippet can be self-signed.

MMP file

The following libraries are required:

LIBRARY cone.lib            //CEikonEnv, CCoeEnv 
LIBRARY avkon.lib //Avkon resources
LIBRARY CommonEngine.lib //StringLoader
LIBRARY euser.lib //CActive, CleanupStack


Resource file

.rss

#include <eikon.rh>
#include <avkon.rsg>
#include <avkon.rh>
 
//...
RESOURCE TBUF r_global_query_header_text
{
buf = "<header text here>";
}
 
RESOURCE TBUF r_global_query_message_text
{
buf = "<message text here>";
}

Header files

  • observer interface
#ifndef GLOBALQUERYOBSERVER_H
#define GLOBALQUERYOBSERVER_H
 
class MGlobalQueryObserver
{
public:
//keep these methods short running because they are called
//from within an active object
virtual void ProcessOkOptionL() = 0;
virtual void ProcessCancelOptionL() = 0;
virtual void ProcessDoneOptionL() = 0;
virtual void ProcessSelectedItemL(const TInt aItem) = 0;
};
 
#endif // GLOBALQUERYOBSERVER_H
  • handler active object
#ifndef GLOBALQUERYHANDLERAO_H
#define GLOBALQUERYHANDLERAO_H
 
#include <e32base.h> //CActive
#include "GlobalQueryObserver.h"
 
class CGlobalQueryHandlerAO : public CActive
{
public:
~CGlobalQueryHandlerAO();
static CGlobalQueryHandlerAO* NewL(MGlobalQueryObserver& aObserver);
static CGlobalQueryHandlerAO* NewLC(MGlobalQueryObserver& aObserver);
public:
void StartHandler();
private:
CGlobalQueryHandlerAO(MGlobalQueryObserver& aObserver)
: CActive (EPriorityStandard), iObserver(aObserver){};
void ConstructL();
private: // from CActive
void RunL();
void DoCancel();
private: // data
MGlobalQueryObserver& iObserver;
};
#endif //GLOBALQUERYHANDLERAO_H
  • container / observer
#ifndef GLOBALQUERYCONTAINER_H
#define GLOBALQUERYCONTAINER_H
 
#include <coecntrl.h> // CCoeControl
#include "GlobalQueryObserver.h"
#include <aknglobalmsgquery.h> //CAknGlobalMsgQuery
class CGlobalQueryHandlerAO;
 
class CGlobalQueryContainer : public CCoeControl, MGlobalQueryObserver
{
public:
//...
void MakeExampleQueryL();
public: // from MGlobalQueryObserver
void ProcessOkOptionL();
void ProcessCancelOptionL();
void ProcessDoneOptionL(); //not used
void ProcessSelectedItemL(const TInt aItem); //not used
//...
private:
CGlobalQueryHandlerAO* iQueryHandlerAO;
CAknGlobalMsgQuery* iGlobalMsgQuery;
};
#endif // GLOBALQUERYCONTAINER_H


Source files

  • handler active object
#include "GlobalQueryHandlerAO.h"
#include <avkon.hrh> //EAknSoftkeyOk, EAknSoftkeyCancel, EAknSoftkeyDone
 
CGlobalQueryHandlerAO::~CGlobalQueryHandlerAO() { Cancel(); }
 
void CGlobalQueryHandlerAO::ConstructL()
{
CActiveScheduler::Add(this);
}
 
CGlobalQueryHandlerAO* CGlobalQueryHandlerAO::NewLC(MGlobalQueryObserver& aObserver)
{
CGlobalQueryHandlerAO* self = new (ELeave) CGlobalQueryHandlerAO(aObserver);
CleanupStack::PushL(self);
self->ConstructL();
return self;
}
 
CGlobalQueryHandlerAO* CGlobalQueryHandlerAO::NewL(MGlobalQueryObserver& aObserver)
{
CGlobalQueryHandlerAO* self = CGlobalQueryHandlerAO::NewLC(aObserver);
CleanupStack::Pop(self);
return self;
}
 
void CGlobalQueryHandlerAO::DoCancel(){}
 
void CGlobalQueryHandlerAO::StartHandler() { SetActive(); }
 
void CGlobalQueryHandlerAO::RunL()
{
if (iStatus == EAknSoftkeyOk)
iObserver.ProcessOkOptionL();
else if(iStatus == EAknSoftkeyCancel)
iObserver.ProcessCancelOptionL();
else if(iStatus == EAknSoftkeyDone)
iObserver.ProcessDoneOptionL();
else
iObserver.ProcessSelectedItemL(iStatus.Int());
 
Cancel();
}
  • container / observer
#include "GlobalQueryContainer.h" //CGlobalQueryContainer
#include "GlobalQueryHandlerAO.h" //CGlobalQueryHandlerAO
#include <GlobalQuery_0xED0C36BE.rsg> //Resources
#include <StringLoader.h> // StringLoader
 
void CGlobalQueryContainer::ConstructL(const TRect& aRect)
{
CreateWindowL();
SetRect(aRect);
ActivateL();
 
MakeExampleQueryL();
}
 
void CGlobalQueryContainer::MakeExampleQueryL()
{
//start the query handler and show global message query
iQueryHandlerAO = CGlobalQueryHandlerAO::NewL(*this);
iQueryHandlerAO->StartHandler();
 
iGlobalMsgQuery = CAknGlobalMsgQuery::NewL();
HBufC* headerText = StringLoader::LoadLC(R_GLOBAL_QUERY_HEADER_TEXT);
HBufC* messageText = StringLoader::LoadLC(R_GLOBAL_QUERY_MESSAGE_TEXT);
 
//show the global message query
iGlobalMsgQuery->ShowMsgQueryL(iQueryHandlerAO->iStatus,
*messageText,
R_AVKON_SOFTKEYS_OK_CANCEL,
*headerText,
KNullDesC);
 
CleanupStack::PopAndDestroy(2); //messageText, headerText
}
 
CGlobalQueryContainer::~CGlobalQueryContainer()
{
//...
delete iQueryHandlerAO;
delete iGlobalMsgQuery;
}
 
void CGlobalQueryContainer::ProcessOkOptionL()
{
//OK pressed, do something
iEikonEnv->InfoWinL(_L("OK"),_L("Pressed"));
}
void CGlobalQueryContainer::ProcessCancelOptionL()
{
//Cancel pressed, do something...
iEikonEnv->InfoWinL(_L("Cancel"),_L("Pressed"));
}
void CGlobalQueryContainer::ProcessDoneOptionL()
{
//not used
}
void CGlobalQueryContainer::ProcessSelectedItemL(const TInt /*aItem*/)
{
//not used
}

Postconditions

The example code shows how to create a global message query, handle its dismissal, and how the active object handler informs an observer class that the dialog has been closed.

See also

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