This message sets 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;
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. It can be any combination of the following constants.
The item is marked for a cut-and-paste operation.
The item is highlighted as a drag-and-drop target.
The item has the focus.
The item is selected.
The application stores the image list index of the current overlay image for each item.
The application stores the image list index of the current state image for each item.
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 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 data. 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 about overlay images and state images, see List-View Image Lists.
For more information on overlay images, state images, and list-view callbacks, see Common Controls Reference.