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Showing a global progress dialog using CAknGlobalProgressDialog

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Forum Nokia KB (Talk | contribs)

Revision as of 12:51, 3 July 2008


ID   Creation date June 13, 2008
Platform S60 3rd Edition, FP1 Tested on devices Nokia N93
Category Symbian C++ Subcategory Files/Data


Keywords (APIs, classes, methods, functions): CAknGlobalProgressDialog, StringLoader, CPeriodic, CAknGlobalProgressDialog::NewL(), CAknGlobalProgressDialog::ShowProgressDialogL(), CAknGlobalProgressDialog::UpdateProgressDialog(), CAknGlobalProgressDialog::ProcessFinished(), StringLoader::LoadLC(), CPeriodic::NewL(), CPeriodic::Start()

Overview

This code snippet shows how to create a global progress dialog CAknGlobalProgressDialog. A global progress dialog is constructed by calling NewL() method and is executed using the ShowProgressDialogL() 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, CPeriodic


Resource file

.rss

#include <eikon.rh>
#include <avkon.rsg>
#include <avkon.rh>
 
//...
RESOURCE TBUF r_global_query_progress_text
{
buf = "<progress dialog 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 <aknglobalprogressdialog.h> //CAknGlobalProgressDialog
 
const TInt KFinalExampleStep = 100;
 
class CGlobalQueryHandlerAO;
 
class CGlobalQueryContainer : public CCoeControl, MGlobalQueryObserver
{
public:
//...
void MakeExampleQueryL();
private:
//...
static TInt TimerCallback(TAny* aThis);
void GlobalExampleProcessTimerEvent();
public: // from MGlobalQueryObserver
void ProcessOkOptionL(); //not used
void ProcessCancelOptionL();
void ProcessDoneOptionL();
void ProcessSelectedItemL(const TInt aItem); //not used
//...
private:
CGlobalQueryHandlerAO* iQueryHandlerAO;
CAknGlobalProgressDialog* iGlobalProgressDialog;
CPeriodic* iTimer;
TInt iCurrentExampleStep;
};
#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 progress dialog
iQueryHandlerAO = CGlobalQueryHandlerAO::NewL(*this);
iQueryHandlerAO->StartHandler();
 
iGlobalProgressDialog = CAknGlobalProgressDialog::NewL();
 
HBufC* progressText = StringLoader::LoadLC(R_GLOBAL_QUERY_PROGRESS_TEXT);
 
iCurrentExampleStep = 0;
 
iGlobalProgressDialog->ShowProgressDialogL(
iQueryHandlerAO->iStatus,
*progressText,
R_AVKON_SOFTKEYS_CANCEL);
 
//start example process and update the progress dialog
iTimer = CPeriodic::NewL(EPriorityLow);
iTimer->Start(1000, 1000, TCallBack(TimerCallback, this));
 
CleanupStack::PopAndDestroy(); //progressText
}
 
CGlobalQueryContainer::~CGlobalQueryContainer()
{
//...
delete iQueryHandlerAO;
delete iGlobalProgressDialog;
 
if(iTimer)
{
iTimer->Cancel();
delete iTimer;
}
}
 
TInt CGlobalQueryContainer::TimerCallback(TAny* aThis)
{
static_cast< CGlobalQueryContainer* >(aThis)->GlobalExampleProcessTimerEvent();
 
return 0;
}
 
void CGlobalQueryContainer::GlobalExampleProcessTimerEvent()
{
if (!iGlobalProgressDialog)
{
return;
}
 
iCurrentExampleStep++;
 
if (iCurrentExampleStep <= KFinalExampleStep)
{
iGlobalProgressDialog->UpdateProgressDialog(iCurrentExampleStep, KFinalExampleStep);
}
else
{
iGlobalProgressDialog->ProcessFinished();
iTimer->Cancel();
}
}
 
void CGlobalQueryContainer::ProcessOkOptionL()
{
//not used
}
void CGlobalQueryContainer::ProcessCancelOptionL()
{
//Cancel pressed, do something...
iEikonEnv->InfoWinL(_L("Cancel"),_L("Pressed"));
}
void CGlobalQueryContainer::ProcessDoneOptionL()
{
//Progress dialog ready, do something...
iEikonEnv->InfoWinL(_L("Progress"),_L("Done"));
}
void CGlobalQueryContainer::ProcessSelectedItemL(const TInt /*aItem*/)
{
//not used
}

Postconditions

The example code shows how to create a global progress dialog, update the progress bar, 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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