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NM_CUSTOMDRAW (list view) notification code

  • Artikkeli

Sent by a list-view control to notify its parent windows about drawing operations. This notification code is sent in the form of a WM_NOTIFY message.

NM_CUSTOMDRAW

    lpNMCustomDraw = (LPNMLVCUSTOMDRAW) lParam;

Parameters

lParam

Pointer to a NMLVCUSTOMDRAW structure that contains information about the drawing operation. The first member of this structure, nmcd, is a pointer to an NMCUSTOMDRAW structure. The dwItemSpec member of the structure pointed to by nmcd contains the identifier of the item being drawn and the lItemlParam member contains its application-defined data.

Return value

The value your application can return depends on the current drawing stage. The dwDrawStage member of the associated NMCUSTOMDRAW structure holds a value that specifies the drawing stage. You must return one of the following values.

Return code Description
CDRF_DODEFAULT
 The control will draw itself. It will not send any additional NM_CUSTOMDRAW notification codes for this paint cycle. This occurs when dwDrawStage equals CDDS_PREPAINT.
CDRF_DOERASE
 Windows Vista. The control will only paint the background.
CDRF_NOTIFYITEMDRAW
 The control will notify the parent of any item-related drawing operations. It will send NM_CUSTOMDRAW notification codes before and after drawing items. This occurs when dwDrawStage equals CDDS_PREPAINT.
CDRF_NOTIFYPOSTERASE
 The control will notify the parent after erasing an item. This occurs when dwDrawStage equals CDDS_PREPAINT.
CDRF_NOTIFYPOSTPAINT
 The control will notify the parent after painting an item. This occurs when dwDrawStage equals CDDS_PREPAINT.
CDRF_NEWFONT
 The application specified a new font for the item; the control will use the new font. For more information about changing fonts, see Changing fonts and colors. This occurs when dwDrawStage equals CDDS_ITEMPREPAINT.
CDRF_NOTIFYSUBITEMDRAW
 Version 4.71. Your application will receive an NM_CUSTOMDRAW control code with dwDrawStage set to CDDS_ITEMPREPAINT | CDDS_SUBITEM before each list-view subitem is drawn. You can then specify font and color for each subitem separately or return CDRF_DODEFAULT for default processing. This occurs when dwDrawStage equals CDDS_ITEMPREPAINT.
CDRF_SKIPDEFAULT
 The application drew the item manually. The control will not draw the item. This occurs when dwDrawStage equals CDDS_ITEMPREPAINT.
CDRF_SKIPPOSTPAINT
 Windows Vista. The control will not draw the focus rectangle.

Remarks

Version 5.80. If you change the font by returning CDRF_NEWFONT, the list-view control might display clipped text. This behavior is necessary for backward compatibility with earlier versions of the common controls. If you want to change the font of a list-view control, you will get better results if you send a CCM_SETVERSION message with the wParam value set to 5 before adding any items to the control.

Requirements

Requirement Value
Minimum supported client
 Windows Vista [desktop apps only]
Minimum supported server
 Windows Server 2003 [desktop apps only]
Header
Commctrl.h