On 20 Jul 2012, at 18:26, Martin Hewitson wrote:
>>> In my app I have a user action which allows them to select a particular
>>> line in a PDFView. The relevant method (on my PDFView subclass) looks like
>>> this.
>>>
>>> - (void)displayLineAtPoint:(NSPoint)point
>>> inPageAtIndex:(NSUInteger)pageIndex
>>> {
>>> if (pageIndex < [[self document] pageCount]) {
>>> [[self window] makeFirstResponder:self];
>>> PDFPage *page = [[self document] pageAtIndex:pageIndex];
>>> PDFSelection *sel = [page selectionForLineAtPoint:point];
>>> [self performSelectorOnMainThread:@selector(goToPage:) withObject:page
>>> waitUntilDone:YES];
>>> [self setCurrentSelection:sel];
>>> [self scrollSelectionToVisible:self];
>>> [self display];
>>> [self setCurrentSelection:nil];
>>> [self performSelector:@selector(setCurrentSelectionAndAnimate:)
>>> withObject:sel afterDelay:0.2];
>>> }
>>> }
>>
>> [self performSelectorOnMainThread:@selector(goToPage:) withObject:page
>> waitUntilDone:YES];
>>
>> looks suspicious. If you're doing this on a secondary thread (which this
>> line implies), I'm pretty sure that at least the call to
>> -makeFirstResponder: is illegal (main thread only). Not sure about the PDF
>> document class.
>
> No, it's all done on the main thread. Actually, using
> performSelectorOnMainThread... was just an attempt to get the thing to behave
> properly. Nominally I'm just calling -setCurrentSelectionAndAnimate:
> directly. The results are the same.
goToPage: will scroll the shortest distance that shows as much of the page as
possible, so it might not even show the whole page and hence, possibly, not the
selection. You might want to create a destination (to page and point) and then
use goToDestination: to go there. It offers greater precision, and ensures
point will always be visible.
Also: is "setCurrentSelectionAndAnimate" a method of your own? PDFView has
setCurrentSelection:animate:
-António
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