Doesn't the WC_COMBOBOXEX class contain other classes as well?
Yes, that's correct! The class WC_COMBOBOXEX (also ComboBoxEx in the WinAPI) extends the standard ComboBox and integrates various controls such as WC_COMBOBOX , WC_EDIT and WC_LISTBOX .
This extension offers additional features, such as the ability to display icons next to elements or to provide enhanced editing capabilities in the edit field.
Here is an overview of the three main components that make up WC_COMBOBOXEX :
- Function:
This is the basic ComboBox, which provides a list of items for selection and an option to display them in the edit field.
- Items:
The standard ComboBox typically consists of a dropdown button and a list section (which pops up when the user clicks the dropdown button).
2.) WC_EDIT (Edit)
- Function:
The Edit control provides the text area in the ComboBox where the user can enter text. In a ComboBox with the CBS_DROPDOWN style, the user can edit the text directly.
- Properties:
The text area can be read-only or editable, depending on the ComboBox style ( CBS_DROPDOWN for editable or CBS_DROPDOWNLIST for non-editable).
3.) WC_LISTBOX (ListBox)
- Function:
The ListBox is the part of the ComboBox that contains and displays the actual items when the dropdown is opened.
- Properties
: It displays a list of selectable items and allows the user to make a selection, which is then displayed in the editing area.
4.) ComboBoxEx extensions:
ComboBoxEx extends the standard ComboBox with additional features not available in the regular ComboBox
: 1. Icon Support:
You can display icons next to list items in ComboBoxEx
, which is especially useful for making entries more visually appealing or easier to identify. 2. More Control over Item Data:
Items in ComboBoxEx can contain more data than simple text values, such as additional item information or user-defined data structures.
3. Autocomplete: ComboBoxEx offers autocomplete support, helping users find entries faster by automatically completing them as they type.
4. Improved API
: Special messages like CBEM_SETIMAGELIST and CBEM_INSERTITEM enable working with icons and other ComboBoxEx features.
5.) Example of a ComboBoxEx with symbols:
Here's an example of how you can use a ComboBoxEx with symbols:
#include <windows . h>
#include <commctrl . h>
// Initialization of the Common Controls (e.g. in the dialog setup or in the InitDialog)
INITCOMMONCONTROLSEX icex;
icex . dwSize = sizeof ( INITCOMMONCONTROLSEX ) ;
icex.dwICC = ICC_USEREX_CLASSES ; // Initializes Extended Controls
InitCommonControlsEx ( & icex ) ;
// Creating a ComboBoxEx
HWND hwndComboBoxEx = CreateWindowEx (0 , WC_COMBOBOXEX, NULL,
CBS_DROPDOWN | WS_CHILD | WS_VISIBLE | WS_BORDER,
10 , 10 , 200 , 150 , hwndParent, NULL, hInstance, NULL ) ;
// Set an image list for the ComboBoxEx
HIMAGELIST hImageList = ImageList_Create (16 , 16 , ILC_COLOR32, 1 , 1) ;
ImageList_AddIcon ( hImageList, LoadIcon ( NULL, IDI_APPLICATION )) ;
SendMessage ( hwndComboBoxEx, CBEM_SETIMAGELIST, 0 , ( LPARAM ) hImageList ) ;
// Add an item with an icon
COMBOBOXEXITEM cbei = {0 } ;
cbei . mask = CBEIF_TEXT | CBEIF_IMAGE | CBEIF_SELECTEDIMAGE;
cbei . iItem =0 ;
cbei . pszText = L "Item 1" ;
cbei . iImage =0 ;
cbei . iSelectedImage =0 ;
SendMessage ( hwndComboBoxEx, CBEM_INSERTITEM, 0 , ( LPARAM ) &cbei ) ;
6.) Conclusion:
WC_COMBOBOXEX combines the functionalities of WC_COMBOBOX , WC_EDIT , and WC_LISTBOX , extending them with additional features such as icons, more complex data storage, and an improved user experience through autocomplete. This makes it a very flexible and powerful control for many applications in Windows user interface programming.
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