On Apr 2, 2010, at 2:08 PM, Nick Zitzmann wrote:
>
> On Apr 2, 2010, at 2:19 PM, Jenny M wrote:
>
>> D'oh, you told me that before and I completely forgot. So I tried
>> that, but the page still appears blank. I don't want the page to be
>> visible so I didn't set makeKeyOrderFront.
FWIW, I'm able to draw WebView content to a bitmap without involving an
offscreen window at all, so I'm not sure what problem Nick ran into with that.
One thing that's bitten me is that you need to force layout if you send
setAllowsScrolling:NO to the WebFrameView.
> There's one more thing. WebView loads requests asynchronously, so you need to
> block while it is loading the request and laying out the page while taking
> some time out to run the run loop. So do something like this:
>
> while ([myWebView isLoading])
> {
> NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
>
> [myWebView setNeedsDisplay:NO];
> [NSApp nextEventMatchingMask:NSAnyEventMask untilDate:[NSDate
> dateWithTimeIntervalSinceNow:1.0] inMode:NSDefaultRunLoopMode dequeue:YES];
> [pool drain];
> }
> [webView setNeedsDisplay:YES];
>
> When this loop is done, any print operation you perform on the web view ought
> to work.
Just be careful if you use this with any redirects, since -isLoading will
return NO, then a moment later return YES again. That shouldn't matter loading
from a file, but it was very tedious to deal with for creating thumbnails from
web pages (you have to track redirected frames manually).
--
Adam
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