Thread: ListBox Scrolling Problems

ok!

The INITCOMMONCONTROLSEX is used to load the common control classes from the dll

The ListView_SetItemState changes the state of the item in the list view control. In this case it sets the item to selected or focused.

The ListView_EnsureVisible ensures that the list view item is either entirely or partially visible.

ok, so this doesnt do any scrolling? yet? So that the new item is shown, ie as if the scrollbar down arrow is constantly held down. Or does the ensure visiblity suppose to do this?

Whats the next step to get this working?!

Please remember, as youve probably noticed im very new to this and i do appreciate your help very much.


thanks

Hi,

Nope ive not tried MFC. Should i? Ive just started reading up on it.

I thought we were gettin somewhere though with the previous stuff!? hmmm

Rite, here is my code so far,

Code:

// vLog
void vLog(char* vsText)
{
#if defined gtLOG
	char sDateTime[20];
	char sTime[20];
	char sText[256];
	char sLogFile[100]; // store the name of the log file
	FILE* hLogFile;

  // get the current time
  _strtime(sTime);

  // append current time to text
	sprintf(sText, "%s %s", sTime, vsText);

  // add text to list box
	//if (SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, LB_GETCOUNT, 0, 0) >= gtMAX_LIST_ITEMS)
	if (SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, LB_GETCOUNT, 0, 0) >= 140)
	{
		SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, LB_DELETESTRING, (WPARAM) 0, 0);
		SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, LB_ADDSTRING, 0, (LPARAM) (LPCTSTR) sText);
		//SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, LVM_ENSUREVISIBLE, (WPARAM) SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, LB_GETCOUNT, 0, 0), FALSE);
		//SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, LVM_SCROLL, (WPARAM) SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, LB_GETCOUNT, 0, 0), FALSE);
		SetWindowPos(u_hDlg, 0, 0, SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, LB_GETCOUNT, 0, 0), 0, 0), 0, 0, SWP_NOSIZE | SWP_NOZORDER);
	}
	else
	{	
		
		//SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, LVM_ENSUREVISIBLE, (WPARAM) SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, LB_GETCOUNT, 0, 0), FALSE);
		//SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, LVM_SCROLL, (WPARAM) SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, LB_GETCOUNT, 0, 0), FALSE);
		
		SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, LB_ADDSTRING, 0, (LPARAM) (LPCTSTR) sText);
		SetWindowPos(u_hDlg, 0, 0, SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, LB_GETCOUNT, 0, 0), 0, 0), 0, 0, SWP_NOSIZE | SWP_NOZORDER);
	
	}

	// create file name based on date
	vGetTime(sDateTime, gtDATE);
	sprintf(sLogFile, "c:\\sms\\c\\c_%s.log", sDateTime);

	// log text to file
  if (hLogFile = fopen(sLogFile, "a+"))
	{	
		fprintf(hLogFile, "%s \n", sText);
		fflush(hLogFile);
		fclose(hLogFile); 
	}
#endif
}

As you may have noticed ive tried to use the SetWindowPos function to always show the most recent item entered to the listbox. Not sure if this is setup correctly? But it seems easyier to implement than the previous methods we were discussing. If you think i am wrong please say and describe what i can do.

Surely it cannot be this hard just to keep the most recent item entered into the listbox displayed. ie, so that if the scroll bar comes into play (when all the data cant fit on one screen of the listbox), it is scrolled down to show the current item!


Anyone??!


thanks,

ok, try again!

heres what i have done:-

Code:

// vLog
void vLog(char* vsText)
{
#if defined gtLOG
	char sDateTime[20];
	char sTime[20];
	char sText[256];
	char sLogFile[100]; // store the name of the log file
	FILE* hLogFile;
	long i;
	long ni;

  // get the current time
  _strtime(sTime);

  // append current time to text
	sprintf(sText, "%s %s", sTime, vsText);

  // add text to list box
		
	i = SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, LB_GETCOUNT, 0, 0);
	
	while (i >= gtMAX_LIST_ITEMS)
	{
		SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, LB_DELETESTRING, (WPARAM) 0, 0);
		i = SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, LB_GETCOUNT, 0, 0);
	}

	
	
		ni = SendDlgItemMessage(u_hDlg, IDC_EVENTLOG, LB_ADDSTRING, 0, (LPARAM) (LPCTSTR) sText);
		ListView_SetItemState(u_hDlg, ni, LVIS_SELECTED | LVIS_FOCUSED, 0);
		ListView_EnsureVisible(u_hDlg, ni, FALSE);

		UpdateWindow(u_hDlg);
	





	// create file name based on date
	vGetTime(sDateTime, gtDATE);
	sprintf(sLogFile, "c:\\sms\\c\\c_%s.log", sDateTime);

	// log text to file
  if (hLogFile = fopen(sLogFile, "a+"))
	{	
		fprintf(hLogFile, "%s \n", sText);
		fflush(hLogFile);
		fclose(hLogFile); 
	}
#endif
}

Still doesnt work! ie, it doesnt focus on newest item added to the listbox when scrollbar becomes active.