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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| -
| Header File
| winuser.h
| Unicode
| No
| Platform Notes
| None
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MEASUREITEMSTRUCT
The MEASUREITEMSTRUCT structure informs Windows of the dimensions of an owner-drawn control or menu
item. This allows Windows to process user interaction with the control
correctly.
typedef struct tagMEASUREITEMSTRUCT { // mis
UINT CtlType; // type of control
UINT CtlID; // combo box, list box, or button identifier
UINT itemID; // menu item, variable-height list box, or combo box
identifier
UINT itemWidth; // width of menu item, in pixels
UINT itemHeight; // height of single item in list box menu, in pixels
DWORD itemData; // application-defined 32-bit value
} MEASUREITEMSTRUCT;
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
| Owner-draw listview control
| ODT_MENU
| Owner-drawn menu
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CtlID
Specifies the identifier of the combo box, list box, or button. This member is
not used for a menu.
itemID
Specifies the identifier for a menu item or the position of a list box or
combo box item. This value is specified for a list box only if it has the
LBS_OWNERDRAWVARIABLE style; this value is specified for a combo box only if it has the
CBS_OWNERDRAWVARIABLE style.
itemWidth
Specifies the width, in pixels, of a menu item. Before returning from the
message, the owner of the owner-drawn menu item must fill this member.
itemHeight
Specifies the height, in pixels, of an individual item in a list box or a
menu. Before returning from the message, the owner of the owner-drawn combo box,
list box, or menu item must fill out this member.
itemData
Specifies the application-defined 32-bit value associated with the menu item.
For a control, this member 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 LB_HASSTRINGS or CB_HASSTRINGS
style, this value is initially zero. Otherwise, this value is initially the
value 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
Remarks
The owner window of an owner-drawn control receives a pointer to the MEASUREITEMSTRUCT structure as the lParam parameter of a WM_MEASUREITEM message. The owner-drawn control sends this
message to its owner window when the control is created. The owner then fills in
the appropriate members in the structure for the control and returns. This
structure is common to all owner-drawn controls.
If an application does not fill the appropriate members of MEASUREITEMSTRUCT, the control or menu item may not be drawn properly.
See Also
CB_ADDSTRING, CB_INSERTSTRING, CB_SETITEMDATA, LB_ADDSTRING, LB_INSERTSTRING, LB_SETITEMDATA, WM_MEASUREITEM
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