DRAWITEMSTRUCT

DRAWITEMSTRUCT

The DRAWITEMSTRUCT structure provides information the owner window must have to determine how to paint an owner-drawn control or menu item. The owner window of the owner-drawn control or menu item receives a pointer to this structure as the lParam parameter of the WM_DRAWITEM message.

typedef struct tagDRAWITEMSTRUCT { // dis

UINT CtlType;

UINT CtlID;

UINT itemID;

UINT itemAction;

UINT itemState;

HWND hwndItem;

HDC hDC;

RECT rcItem;

DWORD itemData;

} DRAWITEMSTRUCT;

Members

CtlType

Specifies the control type. This member can be one of the following values:

Value	Meaning
ODT_BUTTON	Owner-drawn button
ODT_COMBOBOX	Owner-drawn combo box
ODT_LISTBOX	Owner-drawn list box
ODT_LISTVIEW	List view control
ODT_MENU	Owner-drawn menu item
ODT_STATIC	Owner-drawn static control
ODT_TAB	Tab control

CtlID

Specifies the identifier of the combo box, list box, button, or static control. This member is not used for a menu item.

itemID

Specifies the menu item identifier for a menu item or the index of the item in a list box or combo box. For an empty list box or combo box, this member can be -1. This allows the application to draw only the focus rectangle at the coordinates specified by the rcItem member even though there are no items in the control. This indicates to the user whether the list box or combo box has the focus. How the bits are set in the itemAction member determines whether the rectangle is to be drawn as though the list box or combo box has the focus.

itemAction

Specifies the drawing action required. This member can be one or more of the following values:

Value	Meaning
ODA_DRAWENTIRE	The entire control needs to be drawn.
ODA_FOCUS	The control has lost or gained the keyboard focus. The itemState member should be checked to determine whether the control has the focus.
ODA_SELECT	The selection status has changed. The itemState member should be checked to determine the new selection state.

itemState

Specifies the visual state of the item after the current drawing action takes place. This member can be a combination of the following values:

Value	Meaning
ODS_CHECKED	The menu item is to be checked. This bit is used only in a menu.
ODS_COMBOBOXEDIT	The drawing takes place in the selection field (edit control) of an ownerdrawn combo box.
ODS_DEFAULT	The item is the default item.
ODS_DISABLED	The item is to be drawn as disabled.
ODS_FOCUS	The item has the keyboard focus.
ODS_GRAYED	The item is to be grayed. This bit is used only in a menu.
ODS_SELECTED	The menu item's status is selected.

hwndItem

Identifies the control for combo boxes, list boxes, buttons, and static controls. For menus, this member identifies the menu containing the item.

hDC

Identifies a device context; this device context must be used when performing drawing operations on the control.

rcItem

Specifies a rectangle that defines the boundaries of the control to be drawn. This rectangle is in the device context specified by the hDC member. Windows automatically clips anything the owner window draws in the device context for combo boxes, list boxes, and buttons, but does not clip menu items. When drawing menu items, the owner window must not draw outside the boundaries of the rectangle defined by the rcItem member.

itemData

Specifies the application-defined 32-bit value associated with the menu item. For a control, this parameter specifies the value last assigned to the list box or combo box by the LB_SETITEMDATA or CB_SETITEMDATA message. If the list box or combo box has the LBS_HASSTRINGS or CBS_HASSTRINGS style, this value is initially zero. Otherwise, this value is initially the value that was passed to the list box or combo box in the lParam parameter of one of the following messages:

CB_ADDSTRING
CB_INSERTSTRING
LB_ADDSTRING
LB_INSERTSTRING

If ctlType is ODT_BUTTON or ODT_STATIC, itemData is zero.