How to ensure last line of TListBox is showing?
lazarus / 7-LCL

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tech-pro · 2008-02-01 17:58

I have a debug window that is showing the communication in and out of
the serial port. The data is displayed in a TListBox and I need to
scroll the listbox so that the last line of data is always showing.

I know that setting TopIndex will force the listbox to show the last
entries, but I can't see how to determine how many lines fit in the
window. Under Windows, it is easy, because the font is standard and
the number of lines probably won't change, so I could hard code it.
But this program will be compiled for Linux as well and the font can
be changed by the user.

I thought ItemHeight might give the height of a line in pixels, which
I could devide into the list box height, but under Windows anyway
(which I'm working in now) it appears to return the value zero.

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antonio · 2008-02-07 20:48

Code: [Select]
listbox1.items.add(inttostr(listbox1.items.count+1));//adds an item
listbox1.itemindex := listbox1.items.count -1;//selects the last item