| Specifying
the Tab spacing in a Memo
You can adjust the tabulation spacing in
Memo controls by sending it the EM_SETTABSTOPS message. The WParam
member specifies the number of tab stops contained in the LParam member.
If the WParam is set to zero, the long parameter is ignored and default
tab stops are set at every 32 dialog box units. If set to one, "tab
stops are set at every n dialog box units, where n is the distance pointed
to by the ldpwTabs parameter."
What this means is that for most situations,
you'd specify "1" as the WParam, and a calculated LParam member using the
GetDialogBaseUnits() API function.
KEYWORDS: EM_SETTABSTOPS,
GetDialogBaseUnits()
|
//---------------------------------------------------------------------------
//in
source...
int
TabWidth = 9; //new tab width (9 spaces)
TabWidth
= LOWORD(GetDialogBaseUnits()) * TabWidth * 0.5;
SendMessage(Memo1->Handle,
EM_SETTABSTOPS, (WPARAM)1, (LPARAM)&TabWidth);
|
One thing to note is that some the handle of the Memo or RichEdit will
be destoyed/recreated by changing some properties. These include
WordWrap, ScrollBars, and HideScrollBars, among possibly others.
As such, change all relevant properties first, then set the tab widths.
(This is in general for any edit control messages).
|
