Default Header Control Message Processing
This section describes the window messages handled by the window procedure for
the WC_HEADER window class.
Message
| Processing performed
|
WM_CREATE
| Initializes the header control.
|
WM_DESTROY
| Frees resources allocated for the header control.
|
WM_ERASEBKGND
| Erases the background of the header control using the current background color
for the control.
|
WM_GETDLGCODE
| Returns a combination of the DLGC_WANTTAB and DLGC_WANTARROWS values.
|
WM_GETFONT
| Returns the handle of the current font, which is used by the header control to
draw its text.
|
WM_LBUTTONDBLCLK
| Captures mouse input. If the mouse cursor is on a divider, the control sends a HDN_BEGINTRACK notification message and begins tracking mouse movement. If the cursor is on
a header item, the control redraws the item in the style that indicates the
item is pressed.
|
WM_LBUTTONDOWN
| Same as the WM_LBUTTONDBLCLK message.
|
WM_LBUTTONUP
| Releases the mouse capture. If the control was tracking mouse movement, it
sends the HDN_ENDTRACK notification message and redraws the header control. Otherwise, the control
sends the HDN_ITEMCLICK notification message and redraws the header item that was clicked.
|
WM_MOUSEMOVE
| If a divider is being dragged, the control sends the HDN_TRACK notification message and redraws itself. If the left mouse button is down and
the cursor is on an item, the control redraws the item in the style that
indicates the item is pressed.
|
WM_NCCREATE
| Allocates and initializes an internal data structure.
|
WM_NCDESTROY
| Frees resources allocated by the header control.
|
WM_PAINT
| Paints the invalid region of the header control. If the wParam parameter is non-NULL, the control assumes that the value is an HDC and
paints using that device context.
|
WM_SETCURSOR
| Sets the cursor shape, depending on whether the cursor is on a divider or in a
header item.
|
WM_SETFONT
| Selects a new font handle into the device context for the header control.
|
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