ListView: Unselect All?

[colin glenn]

Jackpot!

Careful reading of the SDK:

ListView_SetItemState(
    HWND hwnd,
    int i,
    UINT state,
    UINT mask
);

i

Index of the list-view item. If this parameter is -1, then the state change is applied to all items.

state

New state bits for the item. The mask parameter indicates the valid bits of the state parameter. The macro ignores bits in the state parameter if the corresponding bit is not set in the mask parameter.

mask

Bits of the state parameter that you want to set or clear. You can use ListView_SetItemState both to set and to clear bits.

So:

ListView_SetItemState(hList, -1, 0, %LVIS_SELECTED)
ListView_SetItemState(hList, hItem, %LVIS_SELECTED, %LVIS_SELECTED)
ListView_EnsureVisible(hList, hItem, %FALSE)

Deselects everything and then selects the one I am interested in, bringing it into view.

[colin glenn]

ListView_SetItemState(hList, -1, %LVIS_SELECTED, %LVIS_SELECTED)
Was a failure of epic status, it selected EVERYTHING!

Guess I'm going to have to loop through the listview and unselect all selected items manually, bummer.

[Michael Mattias]

>ListView_SetItemState(hList, hItem, %LVIS_SELECTED, %LVIS_SELECTED)

This line sets the selected state of zero-based row number 'hitem' to 'selected.'

To unselect an item, make wParam zero (FALSE)

To make your code as shown affect any row other than row zero you will need to set 'hitem' to the 'row number of interest'

Nope, can't unselect 'em all in one shot (with a multi-selection listview). With a single-selection listview, just set hitem (row) to -1& and call your original code above. Well, "maybe" using -1& with a mult-selection control would work. Give it a try.

But I'm not all that sure you can change from multi-select to single-select on the fly like that.

Note also, that there is a separate LVIS_FOCUSED state. I usually set FOCUSED and SELECTED the same so the cursor goes to the selected item.

[colin glenn]

I'm overlooking something, or it's not an API call, where you can unselect all the items in a ListView with a single call. Thought this would work:

vStyle = GetWindowLong(hList, %GWL_STYLE)
SetWindowLong hList, %GWL_STYLE, vStyle OR %LVS_SINGLESEL
SetWindowLong hList, %GWL_STYLE, vStyle
ListView_SetItemState(hList, hItem, %LVIS_SELECTED, %LVIS_SELECTED)

But apparently not, any previous selections are still selected.