[Gambas-user] Huge data in gridview documentation wiki does not explain how

[Fabien Bodard]

2017-05-16 23:21 GMT+02:00 PICCORO McKAY Lenz <mckaygerhard at ...626...>:
> umm so then as you said, the rs number 30000 does not load until i get down
> the gridview to the row 30000! ?
>
> if this the case, how can i implement a search input that retrieve data
> when i put strings!?

gridview is just a viewer !
>
> Lenz McKAY Gerardo (PICCORO)
> http://qgqlochekone.blogspot.com
>
> 2017-05-16 17:10 GMT-04:00 Tobias Boege <taboege at ...626...>:
>
>> On Tue, 16 May 2017, PICCORO McKAY Lenz wrote:
>> > In gambas wiki documentation said:
>> >
>> > You can fill the grid explicitly, or implement the Data
>> > <http://gambaswiki.org/wiki/comp/gb.qt4/gridview/.data> event to display
>> > the grid contents on demand.
>> >
>> > You should use the last method if you have a lot of rows to display. The
>> > control can handle millions of lines gracefully.
>> >
>> > but i try to set gridview.data event and set GridView1*.*Data*.*Text but
>> > when comes the object said it null (Data) ...
>> >
>> > its there any example to load? i have a CSV and also a table db.. please
>> > its the documentation wrong?
>> >
>>
>> It's not. This method is so fast and easy on memory because you load the
>> GridView contents *on demand*. Read the text carefully: it tells you that
>> the GridView will raise the Data *event* (not the Data property; it even
>> links to the Data event documentation [1] which is IMHO comprehensive
>> enough) when it needs the contents of certain cells.
>>
>> So, when the GridView control detects that it should display a certain
>> cell,
>> identified by a Row and a Column number, it will raise the GridView_Data
>> event with just these Row and Column arguments. *During* such a Data event,
>> the GridView.Data property will contain a valid object and you have to
>> retrieve the cell data somehow (from your CSV file or database or ...) and
>> store it inside the GridView.Data property. You may only use the Data
>> property during the Data event.
>>
>> If you still need an example, the IDE source code has some. You can also
>> look at the implementation of the ListBox control in gb.gui.base. It uses
>> the Data event of a GridView internally, too. (Who would've thought that
>> the ListBox is also just a GridView in disguise?)
>>
>> Regards,
>> Tobi
>>
>> [1] http://gambaswiki.org/wiki/comp/gb.qt4/gridview/.data
>>
>> --
>> "There's an old saying: Don't change anything... ever!" -- Mr. Monk
>>
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-- 
Fabien Bodard