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Microsoft provides to developers rich collection of GUI controls. The
edit box control is very useful, but has one diasadvantage: it
does not supports the numeric decimals. This article describes the creation
of numeric edit box.
The Microsoft's controls are localized. For example, if you change the local
time format from the "Regional Options" dialog,
CDateTimeCtrl change it time format. The presented numeric edit box is localized as
well. By the creation time it loads the locale decimal point delimiter and use
it. Here is the code:
const int nBuffLen = ::GetLocaleInfo( LOCALE_USER_DEFAULT,
LOCALE_SDECIMAL, NULL, 0 );
_ASSERT( nBuffLen > 0 );
const int nResult = ::GetLocaleInfo( LOCALE_USER_DEFAULT,
m_strDelim.GetBuffer(nBuffLen), nBuffLen );
_ASSERT(nResult != 0);
Using the code
You should do following steps:
- Place the edit box control on the dialog.
- Assotiate the
CEdit dialog class member to the edit box
- Include the "NumericEdit.h" to the your dialog class header.
- Replace the
Points of Interest
Microsoft says about
The system sends the
WM_SETTINGCHANGE message to all top-level
windows when the
SystemParametersInfo function changes a
system-wide setting or when policy settings have changed.
I checked it, it works. Currently the numeric edit box control sets it's
locale by creation time. It will be much better the control to react to
operation system changes. But the
WM_SETTINGCHANGE message is sent
only to top-level windows, not to child windows. The possible solution is
to handle the
WM_SETTINGCHANGE in main window and delegate the
WM_SETTINGCHANGE message to all child windows, but it seams ugly. I
continue find other solution of this problem.
- 12.08.2003 - First version of the code.