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POCorrectly resizing rows on view-based NSTableView
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copied!<p>A view-based <code>NSTableView</code> with rows that have dynamic heights doesn't resize its rows when the table view size is changed. This is a problem when the row height is derived from the table view's width (think text blocks that fills a column and wraps thus extending the row size).</p> <p>I've been trying to get <code>NSTableView</code> to resize its rows whenever it changed size but have experienced little success:</p> <ul> <li>If I resize only the visible rows by querying <code>enumerateAvailableRowViewsUsingBlock:</code>, some of the non-visible rows doesn't get resized and thus were shown with the old height when the user scrolls and reveal these rows.</li> <li>If I resize all rows it becomes noticeably slow when there are a lot of rows (about 1 second delay after each window resize for 1000 rows in my 1.8Ghz i7 MacBook Air). </li> </ul> <p>Anybody can help?</p> <p>This is where I detect the table view size change - in the table view's delegate:</p> <pre class="lang-c prettyprint-override"><code>- (void)tableViewColumnDidResize:(NSNotification *)aNotification { NSTableView* aTableView = aNotification.object; if (aTableView == self.messagesView) { // coalesce all column resize notifications into one -- calls messagesViewDidResize: below NSNotification* repostNotification = [NSNotification notificationWithName:BSMessageViewDidResizeNotification object:self]; [[NSNotificationQueue defaultQueue] enqueueNotification:repostNotification postingStyle:NSPostWhenIdle]; } } </code></pre> <p>Whereas the following is the handler of the notification posted above, where the visible rows get resized:</p> <pre class="lang-c prettyprint-override"><code>-(void)messagesViewDidResize:(NSNotification *)notification { NSTableView* messagesView = self.messagesView; NSMutableIndexSet* visibleIndexes = [NSMutableIndexSet new]; [messagesView enumerateAvailableRowViewsUsingBlock:^(NSTableRowView *rowView, NSInteger row) { if (row >= 0) { [visibleIndexes addIndex:row]; } }]; [messagesView noteHeightOfRowsWithIndexesChanged:visibleIndexes]; } </code></pre> <p>The alternative implementation that resizes all rows looks like this:</p> <pre class="lang-c prettyprint-override"><code>-(void)messagesViewDidResize:(NSNotification *)notification { NSTableView* messagesView = self.messagesView; NSIndexSet indexes = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0,messagesView.numberOfRows)]; [messagesView noteHeightOfRowsWithIndexesChanged:indexes]; } </code></pre> <p>Note: This question is somewhat related to <a href="https://stackoverflow.com/questions/7504546/view-based-nstableview-with-rows-that-have-dynamic-heights">View-based NSTableView with rows that have dynamic heights</a> but is more focused towards responding to the table view's size change.</p>

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