[Lazarus] String Grid Component
Torsten Bonde Christiansen
tc at epidata.info
Mon Nov 27 17:51:34 CET 2017
On 2017-11-27 16:48, Werner Pamler via Lazarus wrote:
> Am 27.11.2017 um 16:21 schrieb Werner Pamler via Lazarus:
>> (a) What is "fast"? If I populate a standard TStringGrid with 100.000
>> rows x 100 columns (= 10 millions of cells) it takes about 9 seconds
>> on my PC - if BeginUpdate/EndUpdate is used. Not too bad in my eyes.
>> If it's too long you should use a TDrawGrid and paint the cells in
>> the OnDrawCell event. Since this draws only the visible cells it will
>> occur within the blink of an eye. Editing a TDrawGrid is a bit more
>> complicated, though, but doable.
> I forgot: Of course, this does not take into account the time it takes
> to populate the primary storage of the data shown in the DrawGrid.
> Filling a 2D-array with millions of strings, for example, will take
> its time too, 6 seconds on my PC for a 100.000 x 100 array. In these
> tests, the string is assembled as 'R' + IntToStr(rowindex) + 'C' +
Yes, sorry for the lack of other factors too - those were just the two
I already have the data at hand in my own object structure so that is no
problem. By fast i mean less than one second, even on a modern PC. The
users of our program often have old or very old hardware in which case
my/your 9 seconds turns to 30 or more seconds.
In reallity all i need is a read-only grid that can display the data in
string format and range selection so that i can copy/paste the data to
From your reply it seems i am going with TDrawGrid.
Thank you for the help!
> Look at attached demo.
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