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The ActiveX control demonstarted in this article – NCombo Control (see figure) looks like a combobox control, and has more features such as:
- allows more than one column into control (multicolumn);
- each column has an edit control associated. The goal of edit is the same as the standard combobox: searching, selecting. Each edit associated has more properties: enable/disable, show/hide, width. At one moment a single column can be activated.
- allows navigating through columns by pressing TAB for next column, SHIFT+TAB for previous column.
- each column can be resized at runtime, by dragging the column limits.
- allows search for next matching item by pressing F3, backward searching, with SHIFT+F3, or continue search by adding more constraints.
The control offers the following properties, methods and events:
PropertiesType | Name | Parameters | Specification |
bool | ColumnEnable | long nColumn | Get: Return TRUE if the column with index nColumn is enabled. Set: Enable/Disable the column with index nColumn. |
bool | ColumnVisible | long nColumn | Get: Return TRUE if the column with index nColumn is visibled. Set: Show/Hide the column with index nColumn. |
long | ColumnWidth | long nColumn | Get: Return the width of the column with the index nColumn. Set: Set the width of the column with the index nColumn. |
Methods:
Type | Name | Parameters | Specification |
long | InsertColumn | long nColumn CString sColumnName long nWidth long nJustify bool bEnable bool bVisible | Insert a column at nColumn position. If this position is greater than the number of columns then it will be added at the end.
|
bool | DeleteColumn | long nColumn | Delete the column with the index nColumn. Return TRUE if the column was deleted. |
long | GetColumnCount | Return the number of columns | |
CString | GetColumnName | long nColumn | Return the name of the column with the index nColumn |
long | InsertItem | long nItem CString sItem | Insert an item at nItem position. – sItem is the default value for the first column. |
bool | DeleteItem | long nItem | Delete the item with the nItem index Return TRUE if the operation has terminated successfully |
bool | SetItemData | long nItem long wData | This method associates a certain data to the item with the index nItem. This is useful, for example, when you have in the combobox a recordset and for each item with the index nItem you want the AbsolutePosition in the recordset. Return TRUE if the operation has terminated successfully |
bool | SetItemText | long nItem long nColumn CString sText | Put in the column nColumn of the item nItem the text sText Return TRUE if the operation has terminated successfully |
long | GetItemCount | Returns the number of items | |
long | GetItemData | long nItem | Returns the data associated to the item nItem. |
CString | GetItemText | long nItem long nColumn | Returns the text from the column nColumn of the item nItem. |
Events:
Name | Parameters | Specification |
ChangingItem | long nItem | This event is raised when you move through items but you don’t select anyone (the header is not changed). |
ChangedItem | long nItem | This event is raised when you select an item (so when the header is changed). |
ChangeColumnKey | long nColumn | This item is raised when the column key of the column nColumn is changed. |
ChangeColumnContent | long nColumn CString sColumnContent long nType | This event is raised when you change the content of a column. – sColumnContent represents the current content of the column with the index nColumn. |
Download demo project – 187 KB
