Re: Where to noteHeightOfRowsWithIndexesChanged
Thanks for all the responses folks. On 15 Jun 2010, at 7:22 pm, Corbin Dunn wrote: Do the height calculations in the bounds change, and then call the "noteHeight.." method all in the same run loop stack; that will probably fix your problem. Beautiful, works like a dream. Many, many thanks for that, you're a superstar! Even though it is fast, however, a table with 200,000 rows is excessive. There is no way a user can realistically use all those rows without some sort of filtering/searching. I would consider re- doing your UI to have a "more results" button, akin to the Finder spotlight search results. It does have a search, and I would agree, but arbitrary browsing is required (even from the search which just scrolls to the results). Unfortunately it's a PC->Mac port and you'll have to drag me through hot coals before I'll be happy with a Mac version that seems somehow inferior to the PC version. It's an iPhone version next though, so I'll definitely have to re-think the UI for that. Thanks again, Tony Pollard On 15 Jun 2010, at 7:22 pm, Corbin Dunn wrote: On Jun 15, 2010, at 10:55 AM, Jens Alfke wrote: On Jun 15, 2010, at 10:51 AM, Jerry Krinock wrote: I send noteHeightOfRowsWithIndexesChanged: after updating the contents of the array controller to which a table is bound, but I still see little artifacts sometimes. It's in a rarely-used utility view so I've let it slide. But under the conditions you've mentioned, If you can reproduce this, please log a bug. There are usually about 200,000 rows, so calculating the actual height for all rows is not an option (since it takes about 19 seconds). you may have exceeded the capabilities of NSTableView's variable heights I agree. Variable row heights were a late addition to NSTableView (added in 10.3 or 10.4?) and I wouldn’t be surprised if they’re not optimized for huge numbers of rows. The table view is optimized for a huge number of rows -- the implementation in 10.3-10.6 uses a sparse array of row heights, and attempts to lump together equal row heights into a single bucket. This makes it quite fast at computations. Having a lot of non-equal row heights will be more expensive (there is no way around that) as each rowRect computation needs to figure out where to be. Even though it is fast, however, a table with 200,000 rows is excessive. There is no way a user can realistically use all those rows without some sort of filtering/searching. I would consider re- doing your UI to have a "more results" button, akin to the Finder spotlight search results. With respect to: The tableview has variable height rows, and because of a relatively slow data source, resizing and user control of fonts, etc, I don't know the row height in advance. I'm caching the row height, and returning a single-line height if the row is not visible (and the height is not yet known). If the row is visible I calculate the actual height and return that (via the NSTableView heightOfRow delegate). This almost works, but I've not found a good place to put noteHeightOfRowsWithIndexesChanged. I get either overlapping rows or some blank rows during scroll. I've tried NSViewBoundsDidChangeNotification. I've even tried putting it in the heightOfRow delegate (which I know must be wrong), with some re- entrancy control which has given the best results so far (but still displays blank rows sometimes). There are usually about 200,000 rows, so calculating the actual height for all rows is not an option (since it takes about 1 You need to always return the *same* height until you call noteHeightOfRowsWithIndexesChanged. After calling that method, the said indexes can return a new height. Not doing this will cause the types of problems that you see, as the table may (or may not) cache every row height, and expects the same result to be returned for the same row every time (until it was told it changed). Sending the node in some sort of bounds changed notification should be fine -- the problem you are encountering is probably because you are breaking the above rule mentioned. Do the height calculations in the bounds change, and then call the "noteHeight.." method all in the same run loop stack; that will probably fix your problem. corbin ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/tonyp%40neutral.co.uk This email sent to to...@neutral.co.uk ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/
Where to noteHeightOfRowsWithIndexesChanged
Where's the best place to put noteHeightOfRowsWithIndexesChanged to keep a tableview display correct whilst scrolling? The tableview has variable height rows, and because of a relatively slow data source, resizing and user control of fonts, etc, I don't know the row height in advance. I'm caching the row height, and returning a single-line height if the row is not visible (and the height is not yet known). If the row is visible I calculate the actual height and return that (via the NSTableView heightOfRow delegate). This almost works, but I've not found a good place to put noteHeightOfRowsWithIndexesChanged. I get either overlapping rows or some blank rows during scroll. I've tried NSViewBoundsDidChangeNotification. I've even tried putting it in the heightOfRow delegate (which I know must be wrong), with some re- entrancy control which has given the best results so far (but still displays blank rows sometimes). There are usually about 200,000 rows, so calculating the actual height for all rows is not an option (since it takes about 19 seconds). Any ideas anyone? Tony ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Single-click words in NSTableView / NSTextFieldCell
Thanks for that Corbin. That's fine and dandy, except I'm still stuck in identifying the "link" word. There are multiple "link" words or phrases in each cell, so I don't know which one has been hit without some kind of characterIndexForPoint functionality. Or perhaps I can't see the wood for the trees? Tony On 8 Apr 2010, at 5:34 pm, Corbin Dunn wrote: On Apr 8, 2010, at 8:17 AM, Tony P wrote: Hi Folks, I'm trying to implement single-clicking for multiple words/phrases within an NSTableView / NSTextFieldCell, which seems surprisingly tricky. I've tried using NSAttributedString (in the hope I can use a special NSURLProtocol to intercept the hyperlink), but it takes four clicks to get there (row select, cell select, edit, and link- click). I've tried numerous tricks but to no avail. I can over-ride hitTestForEvent (see the "Hyperlinks in Table Views" thread) so the other alternative would be some way of getting characterIndexForPoint for the NSTextFieldCell, but that doesn't seem to exist. I'm hoping I don't need to do something wacky with an off-screen view. How can I get the NSTextFieldCell to react with just one click? Or is there a way to get characterIndexForPoint for the NSTextFieldCell? You'll have to implement the logic in an NSTableView subclass. Override -mouseDown:, grab the cell at the mouse location, look at the cell's contents to see if you hit a link, and if so, do your link stuff. If not, call super for the default selection/tracking/ editing behavior to take place. corbin ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Single-click words in NSTableView / NSTextFieldCell
Hi Folks, I'm trying to implement single-clicking for multiple words/phrases within an NSTableView / NSTextFieldCell, which seems surprisingly tricky. I've tried using NSAttributedString (in the hope I can use a special NSURLProtocol to intercept the hyperlink), but it takes four clicks to get there (row select, cell select, edit, and link-click). I've tried numerous tricks but to no avail. I can over-ride hitTestForEvent (see the "Hyperlinks in Table Views" thread) so the other alternative would be some way of getting characterIndexForPoint for the NSTextFieldCell, but that doesn't seem to exist. I'm hoping I don't need to do something wacky with an off- screen view. How can I get the NSTextFieldCell to react with just one click? Or is there a way to get characterIndexForPoint for the NSTextFieldCell? Tony Pollard ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Centering scrollRowToVisible on NSTableView
I'm trying to vertically center a NSTableView row (variable height) using scrollRowToVisible. The default behaviour seems to be displaying at the next-to-last row within the view. After much research, the only way I can see to do this is to calculate row heights for subsequent rows and adjust the call to scrollRowToVisible accordingly. However, I've got a feeling that there might be something much simpler? Tony Pollard ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
