Combobox и DropDown

[AndrewMarcovich]

При выпадывании раскрывающегося списка происходит DropDown,а что при сворачивании?Я имею ввиду,если не кликаешь элемент из списка,а щелкаешь на другое место формы.

[Maitris]

LostFocus.

[AndrewMarcovich]

LostFocus,если щелкаешь на другой контрол,а если просто по форме,то фокус остается на comboboxe.

[AndrewMarcovich]

Или возник такой вариант:нужно,чтобы при выпадывании списка comboboxa список становился значительно шире,а поле ввода оставалось прежней ширины.

[Kovu]

CBN_CLOSEUP
The CBN_CLOSEUP notification message is sent when the list box of a combo box has been closed. The parent window of the combo box receives this notification message through the WM_COMMAND message.

CBN_CLOSEUP
idComboBox = (int) LOWORD(wParam); // identifier of combo box
hwndComboBox = (HWND) lParam; // handle to combo box

Remarks
If the user changed the current selection, the combo box also sends the CBN_SELCHANGE notification when the drop-down list closes. In general, you cannot predict the order in which notifications will be sent. In particular, a CBN_SELCHANGE notification message may occur either before or after a CBN_CLOSEUP notification message.

To execute a specific process each time the user selects a list item, you can handle either the CBN_SELCHANGE or CBN_CLOSEUP notification message. Typically, you would wait for the CBN_CLOSEUP notification before processing a change in the current selection. This can be particularly important if a significant amount of processing is required.

This notification message is not sent to a combo box that has the CBS_SIMPLE style.