listview.cpp

来自「《UIQ 3 The Complete Guide》书的源代码」· C++ 代码 · 共 772 行 · 第 1/2 页

	// Symbian Signed test criteria CON-03 requires we inform the user we might 
	// cause a billable event - quite why CQikSendAsDialog does not do this is a bit of	
	// an oversight... still its not that hard to add.
	iEikonEnv->InfoWinL(R_STR_SENDAS_BILLABLE_EVENT_TITLE,R_STR_SENDAS_BILLABLE_EVENT_INFO);


	CQikSendAsLogic* sendAs=CQikSendAsLogic::NewL();
	CleanupStack::PushL(sendAs);

// If you wanted to have subject and body text they would be obtained and set here.. This simply
// supports sending a file
//	_LIT(KSubjectText,"Subject text");
//	_LIT(KBodyText,"Body text");
//	sendAs->SetSubjectL(KSubjectText);
//	sendAs->SetBodyTextL(KBodyText);

	TFileName fullName;
	iEngine->EntryFullName(fullName);
	sendAs->AddAttachmentL(fullName);
	CleanupStack::Pop(sendAs); // CQikSendAsDialog guarantees to take ownership

	// KUidMtmQuerySupportAttachments = only display transports that support attachments, as thats
	// what we are attempting to send. (e.g. SMS gets filtered out)
	CQikSendAsDialog::RunDlgLD(sendAs,KUidMtmQuerySupportAttachments);
	}

void CListView::DeleteCurrentEntryL()
//
// User may want to remove the current entry. Firstly request the user confirms they really want to
// do this. If confirmed then go ahead. 
//
	{
	SetCurrentEntry();

	const TFolderEntry& entry=iEngine->CurrentEntry();
	TBuf<256>bb;
	iEikonEnv->Format256(bb,R_STR_ABOUT_TO_DELETE,&entry.EntryName());
	TBuf<64>bb2;
	iEikonEnv->ReadResourceL(bb2,R_STR_ATTENTION);
	if (iEikonEnv->QueryWinL(bb2,bb))
		{
		// before the entry is deleted use any properties 
		iEikonEnv->Format256(bb,R_STR_DELETED,&entry.EntryName());

		// remove entry from disk
		iEngine->DeleteCurrentEntryL();

		// remove from the list view list display as its been deleted
		CQikListBox* listbox=LocateControlByUniqueHandle<CQikListBox>(EListViewListId);
		listbox->RemoveItemL(listbox->CurrentItemIndex());

		// now ensure engine and listBox think the same entry is the current entry
		TInt i=iEngine->CurrentEntryIndex();
		if (i>=0)
			listbox->SetCurrentItemIndexL(i,ETrue,EDrawNow);

		// give some +ve feedback to the user that the delete has occured
		iEikonEnv->InfoMsg(bb);

		// e.g. if no more entries in the current list, make items unavailable.
		UpdateCommandAvailability();
		}
	}

void CListView::TidyUpSoundPlayer()
//
// Tidy up sound player resources.
//
	{
	if (iSoundPlayer)
		{
		// cancel any playback, harmless if not playing back, but will panic if we have not
		// completed the initialization yet.
		if (iSoundInitialized)
			iSoundPlayer->Stop();
		iSoundInitialized=EFalse;
		iSoundPlayer->Close();
		delete(iSoundPlayer);
		iSoundPlayer=NULL;
		}
	}

void CListView::MapcInitComplete(TInt aError,const TTimeIntervalMicroSeconds& aDuration)
//
// The sound we are attempting to play has been loaded. 
//
	{
	if (aError)
		{
		TidyUpSoundPlayer();	
		TBuf<128>bb;
		iEikonEnv->Format128(bb,R_STR_PLAY_SOUND_ERROR,aError);
		iEikonEnv->InfoMsg(bb);
		return;
		}
	iSoundInitialized=ETrue;
	TInt vol=iSoundPlayer->MaxVolume();
	if (iLevel==ESoundLevelMedium)
		vol>>=1;	// half
	else if (iLevel==ESoundLevelLow)
		vol>>=2;	// quarter
	iSoundPlayer->SetVolume(vol);
	iSoundPlayer->Play(); // will call back MapcPlayComplete() when sound playing finished
	iEikonEnv->InfoMsg(R_STR_OPEN_SOUND);
	}

void CListView::MapcPlayComplete(TInt aError)
//
// The sound we were playing has finished, successfully or otherwise.
//
	{
	TidyUpSoundPlayer();	
	}

void CListView::PlayAudioEntryL()
//
// The entry has been classified as an audio entry. Play it back
//
	{
	// if any sound is currently playing we need to ensure we stop it in this application
	// since we re-use the iSoundPlayer property for a different sound.
	TidyUpSoundPlayer();	

	// Create a sound player to playback the currently selected file.
	TFileName name;
	iEngine->EntryFullName(name);
	iLevel=ESoundLevelMedium;
	iSoundInitialized=EFalse;

	// calls back MapcInitComplete() when the sound is loaded.
	iSoundPlayer=CMdaAudioPlayerUtility::NewFilePlayerL(name,*this);
	}

void CListView::OpenEntryL()
//
// View/Open/Play the current entry
//
	{
	SetCurrentEntry();

	switch (iEngine->CurrentEntry().EntryCategory())
		{
	case EAppCategorySound:
		PlayAudioEntryL();
		break;

	case EAppCategoryImage:
		iQikAppUi.ActivateViewL(KViewIdImageConversionView);
		break;
		
	case EAppCategoryVideo:
		iQikAppUi.ActivateViewL(KViewIdVideoPlaybackView);
		break;

	default:
		iEikonEnv->InfoWinL(R_STR_UNKNOWN_OPEN_TITLE,R_STR_UNKNOWN_OPEN_INFO);
		break;
		}
	}

void CListView::HandleCommandL(CQikCommand& aCommand)
//
// Handle the commands coming in from the controls that can deliver cmds..
//
	{
	if (aCommand.Type()==EQikCommandTypeCategory)
		{
		if (aCommand.Id()==EAppCmdEditCategories)
			CQikEditCategoriesDialog::RunDlgLD(CategoryModel(),this);
		else
			{	// one of the category entries has been chosen, update selected category...
			iEngine->ChangeCategoryL(aCommand.CategoryHandle());
			SelectCategoryL(aCommand.CategoryHandle());
			UpdateListBoxL();
			UpdateCommandAvailability();
			}
		}
	else
		{
		switch (aCommand.Id())
			{
		case EAppCmdOpen:
			OpenEntryL();
			break;

		case EAppCmdNew:
			{			
			CCreateNewDialog* q=new(ELeave)CCreateNewDialog;
			TInt type=q->ExecuteLD();
			if (type==EQikCmdGoBack)
				break; // cancelled via a back button (or app button etc)
			if (!type)
				iQikAppUi.ActivateViewL(KViewIdAudioRecordView);
			else
				{
				// even if we cant goto view properly - e.g. no camera on device, UIQ will still leave
				// us in the view, despite the CCameraView::ViewActivatedL() leaving - as its failed to 
				// implement sensible rollback.. e.g. to this view. 
				iQikAppUi.ActivateViewL(KViewIdCameraView);
				}

// The following system dialog could be used to capture a photo. This app has chosen to
// perform the functionality at a more basic level to demo how that is also possible.
//				{
//				CFbsBitmap* image=NULL;
//				CQikCameraCaptureDlg::RunDlgLD(image);
//				delete(image); 
//				}


			break;
			}
		case EAppCmdDelete:
		case EAppCmdDelete2:
			DeleteCurrentEntryL();
			break;

		case EAppCmdSortCascade:
			break;
		case EAppCmdSortByName:
			SortListL(EFolderEntrySortByName,iEngine->SortOrder(),EAppCmdSortByName);
			break;
		case EAppCmdSortBySize:
			SortListL(EFolderEntrySortBySize,iEngine->SortOrder(),EAppCmdSortBySize);
			break;
		case EAppCmdSortByDate:
			SortListL(EFolderEntrySortByModified,iEngine->SortOrder(),EAppCmdSortByDate);
			break;
		case EAppCmdSortByType:
			SortListL(EFolderEntrySortByType,iEngine->SortOrder(),EAppCmdSortByType);
			break;
		case EAppCmdSortOrder: // swap between ascending and descending
			SortListL(iEngine->SortType(),(TFolderEntrySortOrder)(ESortOrderAscending+
									ESortOrderDescending-iEngine->SortOrder()),EAppCmdSortOrder);
			break;

		case EAppCmdSendAs:
			SendFileAsL();
			break;

		case EAppCmdZoom:	// Launch the system std zoom dialog
			CQikZoomDialog::RunDlgLD(iEngine->ListViewZoomState(),*this);
			break;

		case EQikCmdZoomLevel1:	// delivered by the std system zoom dlg...
		case EQikCmdZoomLevel2:
		case EQikCmdZoomLevel3:
			if (iEngine->SetListViewZoomState(aCommand.Id()))
				{ // zoom state has changed 
				CQikViewBase::SetZoomFactorL(CQikAppUi::ZoomFactorL(aCommand.Id(),*iEikonEnv));	
				PerformLayout();
				}
			break;

		case EAppCmdRegister:
			iQikAppUi.HandleCommandL(EAppCmdRegister);
			break;

		case EAppCmdAbout:
			iQikAppUi.HandleCommandL(EAppCmdAbout);
			break;

		case EEikCmdExit:
			iQikAppUi.HandleCommandL(EEikCmdExit);
			break;

		default: // e.g. the back button...
			CQikViewBase::HandleCommandL(aCommand);
			break;
			}
		}
	}

CQikCommand* CListView::DynInitOrDeleteCommandL(
//
// As commands are added to the view we get the opportunity to perform some actions.
// In this case we want to ensure the Radio buttons and SortOrder check item are correct.
//
	CQikCommand* aCommand,
	const CCoeControl& aControlAddingCommands)
	{
	TBool val=EFalse;
	switch (aCommand->Id())
		{

	// determine which of the radio buttons should be checked
	case EAppCmdSortByName:
		if (iEngine->SortType()==EFolderEntrySortByName)
			val=ETrue;
		aCommand->SetChecked(val);
		break;

	case EAppCmdSortBySize:
		if (iEngine->SortType()==EFolderEntrySortBySize)
			val=ETrue;
		aCommand->SetChecked(val);
		break;

	case EAppCmdSortByType:
		if (iEngine->SortType()==EFolderEntrySortByType)
			val=ETrue;
		aCommand->SetChecked(val);
		break;

	case EAppCmdSortByDate:
		if (iEngine->SortType()==EFolderEntrySortByModified)
			val=ETrue;
		aCommand->SetChecked(val);
		break;

	// determine whether the single check box type menu option should be checked
	case EAppCmdSortOrder:
		if (iEngine->SortOrder()==ESortOrderAscending)
			val=ETrue;
		aCommand->SetChecked(val);
		break;
	default:
		break;
		}
	return(aCommand);
	}

void CListView::ViewConstructL()
	{
	// Loads information about the UI configurations this view supports
	// together with definition of each view.	
	ViewConstructFromResourceL(R_LIST_VIEW_CONFIGURATIONS);

	// we want to HandleListBoxEventL() - so observe all the listboxes
	LocateControlByUniqueHandle<CQikListBox>(EListViewListId)->SetListBoxObserver(this); 

	// Create the category list, this version creates it from the set within the engine
	CQikCategoryModel* categories=CQikCategoryModel::NewLC();
	const TInt count=iEngine->CategoryListCount();
	for (TInt i=0;i<count;i++)
		{
		const TAppCategoryEntry& entry=iEngine->CategoryListAt(i);
		TInt16 flags;
		if (entry.iCategoryId==EAppCategoryAll)
			flags=EQikCategoryCantBeRenamed | EQikCategoryCantBeDeleted | EQikCategoryAll;
		else if (entry.iCategoryId==EAppCategoryUnfiled)
			flags=EQikCategoryCantBeRenamed | EQikCategoryCantBeDeleted | EQikCategoryUnfiled;
		else
			flags=0;
		categories->AddCategoryL(entry.iCategoryId,entry.iCategoryName,flags);
		}
	SetCategoryModel(categories);	// takes ownership
	CleanupStack::Pop(categories);

	// by default we view the 'All' category
	SelectCategoryL(EAppCategoryAll);

	// Cause the category picker to be visible/softkey command group to exist.
	SetCategoryModelAsCommandsL();
	
	// set the line below app name to be "List title"
	TBuf<64>bb;
	iEikonEnv->ReadResourceL(bb,R_STR_LIST_TITLE);
	ViewContext()->AddTextL(1,bb); 
	}

void CListView::ViewDeactivated()
//
// The view is being de-activated.
//
	{
	// we always rebuild when come foreground so remove all items here
	CQikListBox* listbox=LocateControlByUniqueHandle<CQikListBox>(EListViewListId);
	TRAPD(junk,listbox->RemoveAllItemsL());
	}

void CListView::ViewActivatedL(
//
// The view is being activated.
//
	const TVwsViewId& aPrevViewId,
	const TUid aCustomMessageId,
	const TDesC8& aCustomMessage)
	{
	UpdateListBoxL();
	TInt i=iEngine->CurrentEntryIndex();
	if (i>=0)
		LocateControlByUniqueHandle<CQikListBox>(EListViewListId)->SetCurrentItemIndexL(i,ETrue,EDrawNow);
	UpdateCommandAvailability();
	}