[Qt-qml] Performance issue with Repeater

[Sohail Somani]

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
>>
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>>
>>


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Sohail Somani
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