TV_ITEM info  Overview  Group

The TV_ITEM structure specifies or receives attributes of a tree-view item.

typedef struct _TV_ITEM {  tvi 

    UINT       mask; 

    HTREEITEM  hItem; 

    UINT       state; 

    UINT       stateMask; 

    LPSTR      pszText; 

    int        cchTextMax; 

    int        iImage; 

    int        iSelectedImage; 

    int        cChildren; 

    LPARAM     lParam; 

} TV_ITEM, FAR *LPTV_ITEM; 

 

Members

mask

Array of flags that indicate which of the other structure members contain valid data. When this structure is used with the TVM_GETITEM message, the mask member indicates the item attributes to retrieve. This member can be a combination of the following values:

Value	Meaning
TVIF_CHILDREN	The cChildren member is valid.
TVIF_HANDLE	The hItem member is valid.
TVIF_IMAGE	The iImage member is valid.
TVIF_PARAM	The lParam member is valid.
TVIF_SELECTEDIMAGE	The iSelectedImage member is valid.
TVIF_STATE	The state and stateMask members are valid.
TVIF_TEXT	The pszText and cchTextMax members are valid.

hItem

Identifies the item to which this structure refers.

state

A set of bit flags and image list indexes that indicate the item’s state. The stateMask member indicates the valid bits of the state member.

For a list of item state bit flags, see Tree-View Item States. For information about the state image and overlay image indexes, see Tree-View Image Lists.

When setting the state of an item, the stateMask member indicates the bits of the state member that are valid. When retrieving the state of an item, the state member returns the current state for the bits indicated in the stateMask member.

stateMask

Specifies the bits of the state member that are valid. If you are retrieving an item’s state, set the bits of the stateMask member to indicate the bits to be returned in the state member. If you are setting an item’s state, set the bits of the stateMask member to indicate the bits of the state member that you want to set. To set or retrieve an item’s overlay image index, set the TVIS_OVERLAYMASK bits. To set or retrieve an item’s state image index, set the TVIS_STATEIMAGEMASK bits.

pszText

Pointer to a null-terminated string that contains the item text if the structure specifies item attributes. If this member is the LPSTR_TEXTCALLBACK value, the parent window is responsible for storing the name. In this case, the tree-view control sends the parent window a TVN_GETDISPINFO notification message when it needs the item text for displaying, sorting, or editing, and a TVN_SETDISPINFO notification message when the item text changes.

If the structure is receiving item attributes, this member is the pointer to the buffer that receives the item text.

cchTextMax

Size of the buffer pointed to by the pszText member if the structure is receiving item attributes. If the structure specifies item attributes, this member is ignored.

iImage

Index in the tree-view control’s image list of the icon image to use when the item is in the non-selected state.

If this member is the I_IMAGECALLBACK value, the parent window is responsible for storing the index. In this case, the tree-view control sends the parent a TVN_GETDISPINFO notification message to get the index when it needs to display the image.

iSelectedImage

Index in the tree-view control’s image list of the icon image to use when the item is in the selected state.

If this member is the I_IMAGECALLBACK value, the parent window is responsible for storing the index. In this case, the tree-view control sends the parent a TVN_GETDISPINFO notification message to get the index when it needs to display the image.

cChildren

Flag that indicates whether the item has associated child items. This member is one of the following values:

Value	Meaning
zero	The item has no child items.
1	The item has one or more child items.
I_CHILDRENCALLBACK	The parent window keeps track of whether the item has child items. In this case, when the tree-view control needs to display the item, the control sends the parent a TVN_GETDISPINFO notification message to determine whether the item has child items.

If the tree-view control has the TVS_HASBUTTONS style, it uses this member to determine whether to display the button indicating the presence of child items. You can use this member to force the control to display the button even though the item does not have any child items inserted. This allows you to display the button while minimizing the control’s memory usage by inserting child items only when the item is visible or expanded.

lParam

A 32-bit value to associate with the item.

Remarks

This structure is used with the TVM_GETITEM, TVM_SETITEM, and TVM_INSERTITEM messages. It is also included with many of the notification messages. When the structure is used to retrieve item information, only the structure members indicated by mask contain valid data. All other members are invalid.

See Also

TVN_GETDISPINFO, TVM_GETITEM, TVM_INSERTITEM, TVN_SETDISPINFO, TVM_SETITEM 

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