CODEWITHSUNDEEP
qtsvgqgraphicsitem
Thalia
Thalia

Reputation: 14615

Can I reuse the QSvgRenderer when I modify the QByteAray contents?

I have a QGraphicsSvgItem subclass that contains an svg that I can change based on user actions.

I can have multiple items of that type - they get created by loading an svg and setting a new svg renderer on them. I am not sure if this is the most effective way - it is how I saw it done in examples.

I store the svg, after loading, in a QByteArray - for fast changes I do string replace on things hat can change. (I have tried to use xml but conversions to QByteAray are too slow).

So... on load item, I do:

inFile >> m_svgContents;   // which is QByteArray
setSharedRenderer(new QSvgRenderer(m_svgContents));

Then on any change, m_svgContents gets modified, and I have to do

m_svgContents.replace(oldInfo, newInfo);
delete renderer();
setSharedRenderer(new QSvgRenderer(m_svgContents));

I just added delete renderer(); because I ran valgrind and it showed a memory leak.

It seems very heavy weight to create a new renderer each time...
Is it possible to reuse the renderer ? The "shared renderer" would suggest that I could share it between multiple items - which is probably not useful to me because each item can have a diferent svg content - and my understanding is that each renderer is per a different svg file...

But maybe it is possible to reuse, instead of deleting and creating a new renderer, when I change the svg contents ?

Upvotes: 0

Views: 526

Answers (1)

Tomas
Tomas

Reputation: 2210

And how about QSvgRenderer::load() ? It should replace current SVG content with the new one.

Upvotes: 2

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