DATAGRID: slow scrolling even in the IDE

[Matthias Rebbe]

Yes your right, but to explain more precisely.

My ios app shall fetch data from a "local" sqlite database. This data contains also the URL to an image.
The fetched data shall be displayed immediately in the form. it could happen that about 200 records have to be put in the datagrid.
If i have to download 200 images first before i can display the datagrid, then this  takes definitely to long. Because of that i thought
i would use the http: Url for the image filename. The datagrid would be populated immediately and the images are loaded while the datagrid is displayed.

My problem is,  that the scrolling stopped although all images were loaded already. I know that, because i scrolled from top to bottom and all images were display.

Matthias

Am 05.06.2012 um 00:16 schrieb Ken Corey:

> On 04/06/2012 22:52, Matthias Rebbe wrote:
>> for an iOS app i need the possibility to show several records, each with one image  and 4 text fields.
>> 
>> I am now experimenting in the ide to find out how to do that.
>> I thought a datagrid form might be the right solution for that.
>> 
>> The following happens in the ide. I did not try under iOS, but it i am sure it´s the same.
>> My row template contains 3 fields and one image (fixed size 60x60).
>> The image (each about 15bk) is fetched from  a web server.   So i set the filename of the image to the  "http:.." url.
>> When i scroll the records the scrolling stops several times, although all images seemed to be loaded.
>> When i use local files then the scrolling is smooth.
>> Is there something i can do?
> 
> Surely you don't want to fetch an image (even a small one) each time it needs to be displayed.
> 
> Why not download the images to specialFolderPath(documents), at which point you're local, so you can point your datagrid at them there?
> 
> -Ken
> 
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