EDN Admin
Well-known member
Hello Folks:
Developing a 32 bit application on Win7/64 Ultra, VS 2010, WIN32 no MFC.
I need to display a list of custom drawn items, with items of different heights.
I seem to be unable to get a tall ListBox item to display with a proper height.
A height of 1248, is set in the MEASUREITEMSTRUCT, for the ListBoxs third item.
WM_MEASUREITEM for the third item in this list returns with an itemHeight of 1248 set in the MEASUREITEMSTRUCT. This is a UINT, so 1248 shouldnt be a problem.
When servicing the WM_DRAWITEM message for the third item, the DRAWITEMSTRUCTs rcItem.top value of 144, which is correct for the third item.
The problem is the rcItem.bottom value of 368! Thats a height of 224, not 1248.
1248 - 224 = 1024.
I thought this might be some modulo 1024, but designating a height of 1020 results in a drawing rectangle with a height of 252.
reItem.bottom is a LONG. It should be able to handle a value of 1248.
I dont see anything in the ListBox documentation about limits on the height of a ListBox item.
What am I doing wrong?
Thanks
Larry
View the full article
Developing a 32 bit application on Win7/64 Ultra, VS 2010, WIN32 no MFC.
I need to display a list of custom drawn items, with items of different heights.
I seem to be unable to get a tall ListBox item to display with a proper height.
A height of 1248, is set in the MEASUREITEMSTRUCT, for the ListBoxs third item.
WM_MEASUREITEM for the third item in this list returns with an itemHeight of 1248 set in the MEASUREITEMSTRUCT. This is a UINT, so 1248 shouldnt be a problem.
When servicing the WM_DRAWITEM message for the third item, the DRAWITEMSTRUCTs rcItem.top value of 144, which is correct for the third item.
The problem is the rcItem.bottom value of 368! Thats a height of 224, not 1248.
1248 - 224 = 1024.
I thought this might be some modulo 1024, but designating a height of 1020 results in a drawing rectangle with a height of 252.
reItem.bottom is a LONG. It should be able to handle a value of 1248.
I dont see anything in the ListBox documentation about limits on the height of a ListBox item.
What am I doing wrong?
Thanks
Larry
View the full article