LVM_SETCALLBACKMASK

LVM_SETCALLBACKMASK

The LVM_SETCALLBACKMASK message changes the callback mask for a list view control. You can send this message explicitly or by using the ListView_SetCallbackMask macro.

LVM_SETCALLBACKMASK

wParam = (WPARAM) (UINT) mask;

lParam = 0;

Parameters

hwnd

Handle to the list view control.

mask

Specifies the value of the callback mask. The bits of the mask indicate the item states or images for which the application stores the current state data. This value can be any combination of the following constants:

Value	Meaning
LVIS_CUT	The item is marked for a cut-and-paste operation.
LVIS_DROPHILITED	The item is highlighted as a drag-and-drop target.
LVIS_FOCUSED	The item has the focus.
LVIS_SELECTED	The item is selected.
LVIS_OVERLAYMASK	The application stores the image list index of the current overlay image for each item.
LVIS_STATEIMAGEMASK	The application stores the image list index of the current state image for each item.

For more information about overlay images and state images, see List View Image Lists.

Return Values

Returns TRUE if successful or FALSE otherwise.

Remarks

The callback mask of a list view control is a set of bit flags that specify the item states for which the application, rather than the control, stores the current data. The callback mask applies to all of the control's items, unlike the callback item designation, which applies to a specific item. The callback mask is zero by default, meaning that the list view control stores all item state information. After creating a list view control and initializing its items, you can send the LVM_SETCALLBACKMASK message to change the callback mask. To get the current callback mask, send the LVM_GETCALLBACKMASK message.

For more information, see Callback Items and the Callback Mask.