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Introduction

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.

Background

The Microsoft's controls are localized. For example, if you change the local time format from the "Regional Options" dialog,CDateTimeCtrlchange 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:

////// Constructor.///CNumericEdit::CNumericEdit(){// determine the decimal delimiter buffer sizeconstint nBuffLen = ::GetLocaleInfo( LOCALE_USER_DEFAULT,         LOCALE_SDECIMAL, NULL,0 );    _ASSERT( nBuffLen>0 );// get the decimal number delimiterconstint nResult = ::GetLocaleInfo( LOCALE_USER_DEFAULT,         LOCALE_SDECIMAL,         m_strDelim.GetBuffer(nBuffLen), nBuffLen );    _ASSERT(nResult !=0);    m_strDelim.ReleaseBuffer();    }

Using the code

You should do following steps:

1. Place the edit box control on the dialog.
2. Assotiate theCEditdialog class member to the edit box control.
3. Include the "NumericEdit.h" to the your dialog class header.
4. Replace theCEditwithCNumericEdit.

   //// Example of using the code//#include"NumericEdit.h"// some codeprotected:// some code    CNumericEdit m_editNumeric;// some code

Points of Interest

Microsoft says about WM_SETTINGCHANGE :

The system sends theWM_SETTINGCHANGEmessage to all top-level windows when theSystemParametersInfofunction 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 theWM_SETTINGCHANGE message is sent only to top-level windows, not to child windows. The possible solution is to handle theWM_SETTINGCHANGEin main window and delegate theWM_SETTINGCHANGE message to all child windows, but it seams ugly. I continue find other solution of this problem.

History

• 12.08.2003 - First version of the code.

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