Question

I have a webview that shows some animated boxes, but it slows down and lags horribly when I put a drop shadow in the view. Without the shadow, the webview contents animate smoothly.

I achieved a similar effect as safari/chrome when you do a elastic scroll with the touchpad. Looks nice! But doesnt run as smooth as in my inspirations.

Here is the snippet of the shadow setting:

NSShadow *dropShadow = [[NSShadow alloc] init];
[dropShadow setShadowColor:[NSColor blackColor]];
[dropShadow setShadowOffset:NSMakeSize(0, 0)];
[dropShadow setShadowBlurRadius:5.0];

[webview setWantsLayer: YES];
[webview setShadow: dropShadow];

[dropShadow release];

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My question is: How can I work around this problem?

Answer 1

You should not call setWantsLayer:YES on a WebView. Layer-backed web views are unsupported. This was actually pointed out in the 10.5 release notes and has not changed, unfortunately. You’ll need to come up with an alternative solution.