AdvComboBox - Version 2.1

• Download source files - 32 Kb
• Download demo project - 71 Kb

AdvComboBox Article Index

   Introduction
   Installation
   Functions
   Notifications
   Styles
   Future upgrades
   Hints & Tips
   Improvements and Bug Fixes

What's new in Version 2.1

I got really tired of having to add all items in the InitDialog function, which can be really annoying in the case where you have several CAdvComboBox in one page. This class will now look for an entry in the stringtable with the same ID as the CAdvComboBox control has in the resource editor. The demo project has been upgraded to display this feature. More information about this has been added under Installation. If you want to add another stringtable entry, just call the new function LoadString(UINT nID) where nID refers to the stringtable entry.

In this version, I have added the code so the CAdvComboBox can be used with the macro RUNTIME_CLASS. Requested by Krishna.

I've also added the missing functionality that opens the dropdown window by pressing Alt-Down or Alt-Up. This was requested by Thomas Freudenberg.

Introduction

I started to work on a control that I was going to use in another program that had combo boxes within a CListBox. The first criteria that I wanted was that the combobox should be flat (no shadows). I looked around for a while and could not find any suitable so I had to create my own somehow. When I had started to work on the flat combobox, I come to think of another cool feature that would be nice to have. How many times have you wanted the same functionality as the address bar in IE. When you type an address and the IAutoComplete COM-object goes to work. Wonderful!...or not. I wanted the same functionality in a my combobox, and especially the resizeable dropdown window. And so, back to the drawing board. After many long nights and several different approaches, I got it to work.

This ComboBox is not subclassing the MFC's CComboBox mostly because I wanted to be able to resize the drop-down window. Instead, I created a CWnd object that looks almost the same as MFC's CComboBox. The tricky part was to get the dropdown window to react the same way as CComboBox. First of all, the dropdown window has to be a child to the desktop, and then there is the nasty problem with the mouse and keyboard capture. The solution to that problem was to have one window that has a listbox and a scrollbar within itself. The scrollbar that the CListBox class uses could not be used due to the capture problem.

During the development more features were added; checked items and disabled items in the dropdown window.

Below is a picture over the class structure.

Picture 1

The dropdown window of the AdvComboBox is of an autosize style, that is, it calculates the size it needs to show all items in the list.
So the result is a combobox that acts almost the same as the MFC's CComboBox. You should not have to change any code that are already in use, besides that you have to change the resource from the standard combobox to a custom control. I have tested on W2K and XP. Now I turn to CodeProject's members and other to help me test and find bugs, and maybe some new features to add.

Installation

Installation Index
   Create a new project
   Upgrade your current project
   Use CAdvComboBox in a MFC DLL

This article contains of three different ways of implementing the CAdvComboBox class into your project. One describes the workorder for a new project, and the second how to upgrade your current projects, and the last how to implement the CAdvComboBox in a MFC DLL.

Create a new project

1. Create a dialog application using the App Wizard.

The explanation below are built upon that you call your application AdvCBDemo


2. Insert the following files to your workspace

AdvComboBox.h
AdvComboBox.cpp
DropWnd.h
DropWnd.cpp
DropListBox.h
DropListBox.cpp
DropScrollBar.h
DropScrollBar.cpp
VisualStylesXP.h
VisualStylesXP.h

3. Include the file AdvComboBox.h in your AdvCBDemoDlg.h file


4. Add a custom control to your dialog

In resource editor, place a new custom control in the dialog by using the Custom Control tool in the toolbar. Enter the properties for the control as shown in the picture below.

The CAdvComboBox custom control class name is AdvComboBoxCtrl which is defined in AdvComboBox.h.


Picture 2

Descriptions of the different styles to set:


Combo style	Value in property window
CBS_DROPDOWN	0x_____002
CBS_DROPDOWNLIST	0x_____103
CBS_AUTOHSCROLL	0x_____043
CBS_SORT	0x_____103


So this means that if you want your combobox to have the styles CBS_DROPDOWN, CBS_AUTOHSCROLL, and CBS_SORT the style value should end with 142(as seen in picture 2). You can also edit the resource file in text mode and add the styles there. The resouce editor then translate the style you have choosen into this value.

The following styles has not been implemented yet:

   CBS_DISABLENOSCROLL
   CBS_HASSTRINGS
   CBS_LOWERCASE
   CBS_NOINTEGRALHEIGHT
   CBS_OEMCONVERT
   CBS_OWNERDRAWFIXED
   CBS_OWNERDRAWVARIABLE
   CBS_SIMPLE
   CBS_UPPERCASE


5. Add the following public member variable to your CAdvCBDemoDlg class in the AdvCBDemoDlg.h header file:

CAdvComboBox	m_ctlAdvCombo;

6. Add the following DXX_ call in your AdvCBDemoDlg.cpp file

   DDX_Control(pDX, IDC_ADV_COMBO, m_ctlAdvCombo);

   Add it outside of AFX_DATA_MAP to avoid any mishaps in the future.
   Now, the function DoDataExchange(...) should look like this:

   void CAdvCBDemoDlg::DoDataExchange(CDataExchange* pDX)
   {
   	CDialog::DoDataExchange(pDX);
   	//{{AFX_DATA_MAP(CAdvCBDemoDlg)
   
   		// NOTE: the ClassWizard will add DDX and DDV calls here
   
   	//}}AFX_DATA_MAP
   
   	DDX_Control(pDX, IDC_ADV_COMBO, m_ctlAdvCombo);
   }
   

7. Compile and run

You should now be able to test your dialog with the AdvComboBox within it.

Another feature that still has to be implemented is how to get and set data from the control. This is described below.

8. Set and get data from AdvComboBox

You can use the same way to get and set data as you would with a normal CComboBox, except one small difference.
The DDX_CBIndex and DDX_CBString should be changed to DDX_ACBIndex and DDX_ACBString for it to work. These functions can be found in the AdvComboBox.cpp file.

To add functionality to get and set data add one of, or both, the following variables in your AdvCBDemoDlg.h file

int	m_nAdvCombo;
CString	m_strAdvCombo;

You also have to initialize the value to these variables in the constructor of CAdvCBDemoDlg. Add the following code outside AFX_DATA_INIT.

m_nAdvCombo = -1;
m_strAdvCombo = "";

Add also the DDX_ calls in the function DoDataExchange(...) in AdvCBDemoDlg.cpp file below the DDX_Control that you added in step 6.

DDX_ACBIndex( pDX, IDC_ADV_COMBO, m_nAdvCombo );
DDX_ACBString( pDX, IDC_ADV_COMBO, m_strAdvCombo );

You should now be able to use the AdvComboBox control in the same way as the MFC's CComboBox.

The following was added in version 2.1


9. Use a stringtable entry to populate the CAdvComboBox list.

To be able to use the stringtable with this combobox, a stringtable entry has to be created with the same identifier as the control was created with in the resource editor. In this case, the stringtable entry ID should be IDC_ADV_COMBO. Below is a picture (picture 3) of this example that you can add to your project.

In the stringtable entry, a newline ('\n') represents the ending of one item in the combobox list. Please look into the demo project for further information on how to implement this.


Picture 3

Upgrade your current project

This description is not so detailed as the one above. Hopefully you have enough knowledge to manage the following.

1. Insert the following files to your workspace

AdvComboBox.h
AdvComboBox.cpp
DropWnd.h
DropWnd.cpp
DropListBox.h
DropListBox.cpp
DropScrollBar.h
DropScrollBar.cpp
VisualStylesXP.h
VisualStylesXP.h

2. Include the file AdvComboBox.h in your header file

3. Change classnames

Rename all of your CComboBox variable definitions to CAdvComboBox in your header file.


4. Replace resource comboboxes

Replace your current comboboxes in the resource editor to custom controls and set the properties as shown in picture 2. You can of course change the style of the custom control.

Tip! Use the same ID for your custom controls as you had for the comboboxes. This makes it a lot easier further on so that you won't have to change ID's for all your events(ON_CBN_SELCHANGE, etc.) currectly assigned to the standard comboboxes.

5. Change DDX_ calls

Change all DDX_CBIndex and DDX_CBString to DDX_ACBIndex and DDX_ACBString in your .cpp file. Change the ID's in these calls if you didn't set the same ID's on your new custom controls as you had on the old comboboxes.
6. Compile and test

Your project should now work except the limitations of the CAdvComboBox.

Use CAdvComboBox in a MFC DLL

This is just a small description of how to use this class in a DLL that has windows(dialogs) in the DLL, and those windows uses CAdvComboBox. To be able to register the class, you have to change the code somewhat. The HINSTANCE in the structure WNDCLASS must have the DLL's HINSTANCE, and not the calling applications HINSTANCE.

1. Declare a CAdvComboBox variable

Create the class like this:

CAdvComboBox m_ctlAdvCombo( TRUE )

2. Global HINSTANCE variable

You also have to add a global HINSTANCE variable the the DLL project.
Add the following to, for example, StdAfx.cpp in your DLL project:

HINSTANCE g_hDLLInstance = NULL;

Then, add the extern definition in the StdAfx.h file like this:

extern HINSTANCE g_hDLLInstance;

3. Initialize the global HINSTANCE

Set the hDllInstance in the DllMain function.

g_hDLLInstance = hInstance;

4. Change code in CAdvComboBox

Next thing is to find the function RegisterWindowClass() in the AdvComboBox.cpp file. Change the function so it looks like this:

BOOL CAdvComboBox::RegisterWindowClass()
{
    WNDCLASS wndcls;
    HINSTANCE hInst;
    if( m_bInst )
    {
        hInst = g_hDLLInstance;
    }
    else
    {
        hInst = AfxGetInstanceHandle();
    }

    ASSERT( hInst != 0 );

    ...
	
    return TRUE;
}



5. Export the CAdvComboBox class

Last, but not least, you have to make the class exported if you want to be able to use it outside the DLL. Remember to make the two DDX_ functions exported too. Class definition:

class __declspec(dllexport) CAdvComboBox : public CWnd

DDX_ Definitions:

_declspec(dllexport) void AFXAPI DDX_ACBIndex( CDataExchange* pDX, 
                                               int nIDC, int& index );
_declspec(dllexport) void AFXAPI DDX_ACBString( CDataExchange* pDX, 
                                                int nIDC, CString& value );

AdvComboBox Functions

The functions in CAdvComboBox class are the same as in MFC's CComboBox. For mor help on those, look in MSDN.
There are also some extra functions that can be used. These are described below

• GetComboRect
 

Description:	Retrieve the pos and size of the combobox with this function
Definition:	CRect& GetComboRect()
Returns:	Rect of the AdvComboBox

 
• GetDefaultVisibleItems     New in ver 2.0
 

Description:	Returns the default number of visible items of the dropdown window. To set the default number, use SetDefaultVisibleItems(int)
Definition:	int GetDefaultVisibleItems()
Returns:	Number of items.

 
• GetItemChecked
 

Description:	Get the checked status of an item
Definition:	BOOL GetItemChecked( int nIndex )
Parameter:	nIndex  Item index in list
Returns:	TRUE if item nIndex is checked, or CB_ERR if an error occurred.

 
• GetItemDisabled

Description:	Get the disabled status of an item
Definition:	BOOL GetItemDisabled( int nIndex )
Parameter:	nIndex  Item index in list
Returns:	TRUE if item nIndex is disabled, or CB_ERR if an error occurred.

 
• GetMinVisibleItems     New in ver 1.2

Description:	Get the minimum visible listbox items in the dropwindow, before the dropwindow will be placed above the combobox.
Definition:	int GetMinVisibleItems()
Returns:	Number of minimum visible listbox item.

 
• LoadString     New in ver 2.1

Description:	Load an entry from the stringtable and add the items in that entry in the dropwindow list.
Definition:	void LoadString( UINT nStringID )
Parameter:	nStringID ID of the string to load.
Returns:	void

 
• ModifyACBStyle

Description:	Modify the style of the CAdvComboBox. The available styles can be found here. This function handles only the ACBS_ styles. It work as MFC's ModifyStyle.
Definition:	void ModifyACBStyle(UINT nRemoveStyle, UINT nAddStyle)
Parameter:	nRemoveStyle  ACBS style to remove.
Parameter:	nAddStyle  ACBS style to add.
Returns:	void

 
• PointInWindow

Description:	Is a CPoint within the combobox rect?
Definition:	BOOL PointInWindow( CPoint ptScreenPoint )
Parameter:	ptScreenPoint  Is this point within the combobox.
Returns:	TRUE if the point is in combobox window.

 
• SetDefaultVisibleItems     New in ver 2.0

Description:	Set the default visible number of items in the dropdown window.
Definition:	void SetDefaultVisibleItems( int nItems = -1 );
Parameter:	nItems  Number of items to be visible when the dropdown window is shown. Set this to -1 if the style should be autosize.
Returns:	void

 
• SetItemChecked

Description:	Set an item in combo to either check or un-checked.
Definition:	void SetItemChecked( int nIndex, BOOL bChecked )
Parameter:	nIndex  Zero-based item index to the item to set.
Parameter:	bChecked  New state of the item to set.
Returns:	void

 
• SetItemDisabled

Description:	Set an item in combo to either disabled or enabled.
Definition:	void SetItemDisabled(int nIndex, BOOL bDisabled)
Parameter:	nIndex  Zero-based item index to the item to set.
Parameter:	bDisabled  New state of the item to set.
Returns:	void

 
• SetMinVisibleItems     New in ver 1.2

Description:	Set the minimum visible listbox items in the dropwindow, before the dropwindow will be placed above the combobox. The default is five items.
Definition:	void SetMinVisibleItems(int nMinItems)
Parameter:	nMinItems  Number of minimum listbox items.
Returns:	void

 
• DDX_ACBIndex

Description:	Use this function to get and set data with MFC's UpdateData(...)
Definition:	void AFXAPI DDX_ACBIndex( CDataExchange* pDX, int nIDC, int& index )

 
• DDX_ACBString

Description:	Use this function to get and set data with MFC's UpdateData(...)
Definition:	void AFXAPI DDX_ACBString( CDataExchange* pDX, int nIDC, CString& value )

Below is a list of CComboBox functions implemented in CAdvComboBox.

• AddString
• DeleteString
• FindString
• FindStringExact
• GetCount
• GetCurSel
• GetDroppedControlRect
• GetDroppedState
• GetEditSel
• GetItemData
• GetItemDataPtr
• GetLBText
• GetLBTextLen
• GetTopIndex
• InsertString
• LimitText     New in ver 1.2
• ResetContent
• SelectString
• SetCurSel
• SetEditSel
• SetItemData
• SetItemDataPtr
• SetTopIndex
• ShowDropDown

The following CComboBox functions are not implemented in CAdvComboBox

• Clear
• CompareItem
• Copy
• Cut
• Dir
• DrawItem
• DeleteItem
• GetDroppedWidth
• GetExtendedUI
• GetHorizontalExtent
• GetItemHeight
• GetLocale
• MeasureItem
• Paste
• SetDroppedWidth
• SetExtendedUI
• SetHorizontalExtent
• SetItemHeight
• SetLocale

AdvComboBox Notifications

The CAdvComboBox sends the following notifications to the parent, as MFC's CComboBox does.

• CBN_CLOSEUP
• CBN_DROPDOWN
• CBN_EDITCHANGE
• CBN_EDITUPDATE
• CBN_KILLFOCUS
• CBN_SELCHANGE
• CBN_SELENDCANCEL
• CBN_SELENDOK
• CBN_SETFOCUS

The following notifications are not sent.

• CBN_DBLCLK

This message is only sent when the combobox style is CBS_SIMPLE and CAdvComboBox does not support this style.
• CBN_ERRSPACE

There are no memory management built into this control yet, and I'm not sure if I'll ever do that. Boring!

AdvComboBox Styles

The CAdvComboBox has its own styles. They are described here.

• ACBS_FLAT

Makes the combobox flat. With this style the combobox will be drawn all the way out to the borders of the custom control rect in the resources.

• ACBS_STANDARD

With this style the combobox will be drawn as an ordinary combobox, i.e. 3D look.

• ACBS_CHECKED

To make the dropdown window contain a checkable list, use this style.

• ACBS_AUTOAPPEND

The AdvComboBox will automaticallly search the dropwindow items after the nearest match to the text that has been entered in the editbox of the AdvComboBox. If found, it will then append the remaining text to the editbox.

• ACBS_AUTOSUGGEST

While entering text in the editbox, the AdvComboBox will display a list in the dropdown window the matches the entered text.

The CAdvComboBox supports the following CComboBox styles

• CBS_AUTOHSCROLL
• CBS_DROPDOWN
• CBS_DROPDOWNLIST
• CBS_SORT

The following CComboBox styles are not supported

• CBS_DISABLENOSCROLL
• CBS_HASSTRINGS
• CBS_LOWERCASE
• CBS_NOINTEGRALHEIGHT
• CBS_OEMCONVERT
• CBS_OWNERDRAWFIXED
• CBS_OWNERDRAWVARIABLE
• CBS_SIMPLE
• CBS_UPPERCASE

Future Upgrades

• .NET compatible

Hints & Tips

• Use ClassWizard

Create your project with MFC's CComboBox so the ClassWizard can help you with notification implementation like ON_CBN_SELCHANGE. When you have created all events for the combobox, change to CAdvComboBox. This is the easiest and fastest way to implement this class.


• Set style to flat

Add a call in OnInitDialog() to ModifyACBStyle(...) like this:


m_ctlAdvCombo.ModifyACBStyle( 0, ACBS_FLAT );

• Windows Theme compatible

The AdvComboBox is theme compatible, to the extent that I have tested it. Please let me know if any colors or anything else are wrong. Before telling me, compare one more time with a CComboBox please.

Improvements and Bug Fixes

Version 2.1

• Stringtable entry with same ID will populate the list.



• Added function LoadString(UINT)



• Macro RUNTIME_CLASS can now be used.

In this version, I have added to the code so the CAdvComboBox can be used with the macro RUNTIME_CLASS. Requested by Krishna.


• Pressing Alt+Up/Down opens the dropdown window.

Added the missing functionality that opens the dropdown window by pressing Alt-Down or Alt-Up. This was a request from Thomas Freudenberg.

Version 2.0

• Added function GetDefaultVisibleItems()



• Added function SetDefaultVisibleItems(int)



• Added CAdvComboBox style ACBS_AUTOAPPEND



• Added CAdvComboBox style ACBS_AUTOSUGGEST



• The CAdvComboBox is now also compatible with CommCtrl 6.0 manifest.

I used David Yuheng Zhao's class CVisualStylesXP as the working ground, but I have added some functionality like the functions fetched from the DLL is now static functions, and a function that checks the CommCtrl DLL version to see if we are able to use visual styles. If a manifest is not used, this function will tell us just that even if we're running on WinXP.


• Added two new files: VisualStylesXP.h and VisualStylesXP.cpp

Version 1.21

• Fixed a bug when using Create(...)

The bug appeared when trying to create the CAdvCombBox class with the function Create(...) and the style was CBS_DROPDOWN. Thanx for finding this bug.

Version 1.2

• Scrolling the dropwindow with the mousewheel is implemented.



• The CComboBox function LimitText is now implemented.



• The need for Windows definition _WIN32_WINNT is removed.



• Dropwindow above control

The dropdown window will be shown above the combobox if the distance to the bottom of the screen is not enough. The default minimum number of listbox items is set to five, but this value can be changed by calling the function SetMinVisibleItems(int) in CAdvComboBox class.

Version 1.1

• The control can now be disabled.



• Switching to another program when the dropwindow is down closes the dropwindow.



• Corrected a minor drawing error under Win2K.

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How to make the width of the scrollbar bigger? dragomir 6:34 1 Jun '09   Is there a way to make the width of the scrollbar bigger? Sign In·View Thread·PermaLink My vote of 2 joerg-schumann 4:10 22 Jan '09   There are seem to be big problems with property pages and/or multiple monitors. Sign In·View Thread·PermaLink Re: Multiple Monitors pietje_01 3:30 30 Jan '09   Hi.. I'am also facing the same problem. If I run my application on a secondary monitor the combobox is displayed at the primary monitor. Can you please give me a fix for this issue? Best Regards, Thijs Sign In·View Thread·PermaLink CDropWnd crash simon heffer 6:58 7 Feb '07   Hi Mathias, I'm using your stuff indirectly (in XListCtrl) so I'm not sure if Hans has modified your code. Anyway, I'm getting this crash in the call to CWnd::OnLButtonDown which is called at the end of CDropWnd::OnLButtonDown. By commenting out the CWnd::OnLButtonDown call the crash is avoided but am I missing anything vital by not calling it? Simon Sign In·View Thread·PermaLink 2.00/5 (2 votes) CListCtrl instead of CListBox will help... anandarv 17:58 4 Dec '06   Thanks for sharing this excellent control. I like it very much. I use it in many of my applications. Just a thought for improvement. CDorpListBox, if derived from CListCtrl (instead of CListBox) then it may make possible following - to have multi-columns - support for virtual list - better performance (virtual mode) in case of many combos in one form/dialog. Thanks Anand Sign In·View Thread·PermaLink Use in commercial application? Carl Fredrik Abelson 2:12 27 Nov '06   Hi, Great UI component, love it! I am a software developer and I would like to use it in a commercial software application that I am developing. I will not sell the source code, but I will sell the application that contains the UI component. Is that allowed? Cheers, Carl Fredrik Abelson carl.fredrik.abelson@actix.com Sign In·View Thread·PermaLink 4.20/5 (2 votes) Question (Virtual List for more than 32736 items) ? ana_v123 10:23 25 Nov '06   Nice control. Thanks for sharing. I have one question. To show more than 32736 items (beyond limit of MFC CComboBox), I need to show CListCtrl as Virtual List and to hide inbuilt-listbox of ComboBox. Any idea how to do that ? Thanks Ana Sign In·View Thread·PermaLink No XP Users AngelPortal 3:08 14 Nov '06   It is possible to have the demo raunning in a Win2000 machine.:-> <applet Angel Portal.class > </applet> Sign In·View Thread·PermaLink 1.00/5 (1 vote) Why not emplemented clear method? fst-fst 22:59 20 Sep '06   On initilization my dilog adds new string at ComboBox. I need clear its every time... Sign In·View Thread·PermaLink I had to make the following mods to make it work as I wanted cokes 3:14 21 Jul '06   Style defs are wrong: CBS_DROPDOWN 0x_____002 CBS_DROPDOWNLIST 0x_____003 CBS_AUTOHSCROLL 0x_____040 CBS_SORT 0x_____100 After selecting an item from the listbox, the control would update the editbox then display a single-item listbox with the item just selected. I worked around this by modifying CAdvComboBox::OnUpdateEdit() as follows: if( suggestlist.size() != 0 ) changed to: if( suggestlist.size() > 1 ) Hope this helps someone Sign In·View Thread·PermaLink Feature Request to Mathias Tunared..! ana_v123 8:05 10 Jul '06   Hi Mathias Tunared Your AdvComboBox (Version 2.1) is excellent. Thanks for sharing such a great control. If you can add functionality for multi-columns,It will be even better. ( somewhat similar to CodeProject sample "Super Combo Box - combo-box with columns, colors and more - By ronhash ) Ana Ana_v123 Sign In·View Thread·PermaLink no case censetive dmit_klg 21:54 5 Jun '06   no case censetive can word for find string? Sign In·View Thread·PermaLink Autocompletion scrolling problem Thomas Blenkers 10:21 17 May '06   Hello everyone and special regards to Mathias for this really useful control. I have just put in my project and it fits all needs. Thanks! In the OnEditUpdate handler there is the code for the auto completion if a unique match has been found. The core of the code is these two lines. m_pEdit->SetWindowText( m_iter->strText.c_str() ); m_pEdit->SetSel(nEditLen, (int)m_iter->strText.length(), TRUE ); These lines are the one that are my problem. If the matched text is a long string, taking a wider space than the edit control, the SetWindowText will move the caret pos to the end of the text and doing so it scrolls the beginning of the text (which the user has just typed) out of view. I have tried several scrolling things or using a additional SetSel(0,0,) before the second line, but it was of no use: on the second SetSel, the caret pos always goes to the end of the selection and the scroll always occurs. Help! Thomas Sign In·View Thread·PermaLink 2.00/5 (1 vote) How to set the height ? ouquoi 4:20 17 Feb '06   hi, Nice article ! How can we change the height of the edit zone and the height of the items in the listbox(Not the height of the listbox) ? Thanks Sign In·View Thread·PermaLink 1.00/5 (1 vote) Problem with combo in Windows 98 Manuel Bautista 5:52 21 Dec '05   Hi, I have a problem in a Windows 98 system (IE6 6.00.2600.0000). When I select a item in the combo, the combo close and show the item before selected item. Any suggestion? Thanks in advance Sign In·View Thread·PermaLink 1.00/5 (1 vote) WinXP and Classic Theme selection Manfred Kubica 20:29 14 Jul '05   Hi, if you select classic under xp theme selection the buttons of the combobox are not drawn. I have changed "UseVisualStyles()" in the following way: BOOL CVisualStylesXP::UseVisualStyles() {      static BOOL bUse = -1;      if( bUse != -1 )           return bUse;      HINSTANCE hinstDll;      DLLVERSIONINFO dvi;      ZeroMemory(&dvi, sizeof(dvi));      hinstDll = LoadLibrary(TEXT("comctl32.dll"));      if(hinstDll)      {           DLLGETVERSIONPROC pDllGetVersion;           pDllGetVersion = (DLLGETVERSIONPROC) GetProcAddress(hinstDll, "DllGetVersion");           if(pDllGetVersion)           {                ZeroMemory(&dvi, sizeof(dvi));                dvi.cbSize = sizeof(dvi);                (*pDllGetVersion)(&dvi);           }           FreeLibrary(hinstDll);      }      if( dvi.dwMajorVersion == 6 && dvi.dwMinorVersion == 0 )      {       WCHAR szName [256];       WCHAR szColor [256];       if(!GetCurrentThemeName(szName, 255, szColor, 255, NULL, 0))       {          CString strWinXPThemeColor = szColor;          if(strWinXPThemeColor.CompareNoCase (_T("normalcolor")) == 0 ||                strWinXPThemeColor.CompareNoCase (_T("homestead")) == 0 ||             strWinXPThemeColor.CompareNoCase (_T("metallic")) == 0)          {                 bUse = TRUE;                 return IsAppThemed() && m_hThemeDll; // No need to test HTHEME, but...          }       }       bUse = FALSE;       return FALSE;      }      else      {           bUse = FALSE;           return FALSE;      } } Sign In·View Thread·PermaLink 4.50/5 (4 votes) a big bug dirkiller 16:47 22 May '05   when the drop down window is show and the scrollbar is not disabled,you click the scrollbar and then click the dialog anywhere except the AdvComboBox, you'll find that the drop down window can not be closed. SunDog Sign In·View Thread·PermaLink 4.00/5 (1 vote) Re: a big bug Anonymous 15:19 24 May '05   CDropScrollBar.cpp Line 113 Add case SB_ENDSCROLL: // End scroll. ReleaseCapture(); GetParent()->PostMessage( WM_VRC_SETCAPTURE ); break; Sign In·View Thread·PermaLink Active X Control rk824 2:44 11 May '05   How to build AdvComboBox as Active X Control? I want to use it in Visual Basic. please help me? Sign In·View Thread·PermaLink 1.00/5 (1 vote) A flat scrollbar will be good z16166 15:18 10 Mar '05   I can't find a ComboBox with a flat scrollbar.Pity Sign In·View Thread·PermaLink a small memory leak bug z16166 15:13 10 Mar '05   add one line to CAdvComboBox::LoadString(): delete [] szTok; Sign In·View Thread·PermaLink 1.00/5 (1 vote) Great Control and Example! Galileomak 4:53 28 Nov '04   I search for weeks for how a combo box can pop up a list box that can pop out of the form. Now I finally find the answer from your example. m_pDropWnd->Create( nStyle , rc, 1 ? GetDesktopWindow() : this, 6 ); I think this statment is what i am looking for!! Thanks you very much! Keep on! Sign In·View Thread·PermaLink Bug with ESC- key Stefan Pfitzner 0:42 12 Jul '04   The AdvComboBox - Version 2.1 has the focus and the drop down window is closed. If you then hit the ESC- key the dialog is not closed. It can easily fixed in CAdvComboBox.cpp Line 1362 if( pMsg->wParam == VK_ESCAPE ) { if( m_pDropWnd ) { OnDestroyDropdownList(0,0); Invalidate(); } else { return CWnd::PreTranslateMessage(pMsg); } } Sign In·View Thread·PermaLink I've created this control dynamically, but where EditBox? Gonsaless 7:49 30 May '04   I have created this control dynamically thru Create() call... but as it was pointed i don't see edit box... Looking thru code gives next: PreSubClassWindow function code has next if block: if( !m_bCodeCreate) { } CEdit control is creating inside it... and sure m_bCodeCreate is TRUE.... is there any way to create control dynamically? thanx for attention BY Sign In·View Thread·PermaLink 1.00/5 (1 vote) A few small changes Guy Clinger 11:21 7 May '04   Thanks Mathias for a great component! I made a few small changes. There seems to be a memory leak in CAdvComboBox::LoadString, so I added the following line at the end of the LoadString function: delete [] szTok; I also deleted the following line from CAdvComboBox::CreateDropList, because it does not appear to be used: int nCount = m_list.size(); I wanted the text in the edit box to be selected when the combobox gets focus, so the user can just start typing a new search without first deleting or selecting what is there. To do this, I added the following to CAdvComboBox::OnSetfocusEdit right after the GetFocus line: if (m_pEdit) { m_pEdit->PostMessage(EM_SETSEL, 0, -1); } Finally, I wanted the dropdown list to close when the combobox loses focus, so I added the following to the end of CAdvComboBox::OnKillfocusEdit: if (m_pDropWnd) { OnDestroyDropdownList(0,0); } Sign In·View Thread·PermaLink

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