Owner-Drawn Header Controls
You can define individual items of a header control to be owner-drawn items.
Using this technique gives you more control than you would otherwise have over
the appearance of a header item.
You can use the HDM_INSERTITEM
message to insert a new owner-drawn item into a header control or the HDM_SETITEM
message to change an existing item to an owner-drawn item. Both messages
include the address of an HD_ITEM
structure, which should have the fmt
member set to the HDF_OWNERDRAW value.
When a header control must draw an owner-drawn item, it sends the WM_DRAWITEM
message to the parent window. The wParam
parameter of the message is the child window identifier of the header
control, and the lParam
parameter is a pointer to a DRAWITEMSTRUCT
structure. The parent window uses the information in the structure to draw
the item. For an owner-drawn item in a header control, the DRAWITEMSTRUCT
structure contains the following information.
||ODT_HEADER owner-drawn control type.
||Child-window identifier of the header control.
||Index of the item to be drawn.
||ODA_DRAWENTIRE drawing-action flag.
||ODS_SELECTED drawing-action flag if the cursor is on the item and the mouse
button is down. Otherwise, this member is zero.
||Handle of the header control.
||Handle of the device context of the header control.
||Coordinates of the header item to be drawn. The coordinates are relative to
the upper left corner of the header control.
||Application-defined 32-bit value associated with the item.
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