[Qt-qml] Performance issue with Repeater

[Juha Turunen]

The ListView element inherits from Flickable so you can use all the
same properties as with Flickable (boundsBehavior in this case).

Juha

On Mon, Sep 20, 2010 at 12:57 AM, Sohail Somani <sohail at taggedtype.net> wrote:
> That works nicely, thanks!
>
> Is there a way to prevent the view from going beyond the bounds like the
> Flickable type?
>
> On 10-09-19 5:37 PM, Juha Turunen wrote:
>> How about using a ListView instead of Flickable? This way everything
>> doesn't have to be instantiated at once, but instead ListView smartly
>> creates (and disposes) instances of the delegate component as the user
>> scrolls the view.
>>
>> Juha
>>
>> On Mon, Sep 20, 2010 at 12:19 AM, Sohail Somani<sohail at taggedtype.net>  wrote:
>>> Hi,
>>>
>>> I have a need to create a bunch of rectangles with different heights in a
>>> single column.
>>>
>>> Essentially it's like a scrollable bar chart but with a large number of
>>> entries.
>>>
>>> The self-contained code I'm using to create this bar chart is attached.
>>>
>>> The problem seems to be that when I get to a normal number of elements
>>> (approx 3000), the initial display performance is incredibly slow. I think I
>>> understand why: there are a lot of rectangles that need to be created.
>>>
>>> One option I thought of is to remove all the rectangles that display units
>>> less than a certain amount but this roughly amounts to having less elements
>>> and loses precision. Worst case, I can expect about 60,000 although it is
>>> quite literally impossible for any particular user. In my testing, 3000 is
>>> about normal so I'd like to be able to handle at most 3-4x that amount if
>>> possible.
>>>
>>> So any techniques you can recommend for faster display for the attached?
>>> Delayed loading perhaps?
>>>
>>> Thanks in advance!
>>>
>>> Sohail
>>>
>>> _______________________________________________
>>> Qt-qml mailing list
>>> Qt-qml at trolltech.com
>>> http://lists.trolltech.com/mailman/listinfo/qt-qml
>>>
>>>
>
>
> --
> Sohail Somani
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