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POImplementing NSOutlineView/NSTableView with different cells (and data types) per row
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copied!<p>I'm wondering how one would implement an outline view like the one Xcode 3 is using for the build configuration:</p> <p><a href="http://img812.imageshack.us/img812/9467/xcodeoutlineview.png">alt text http://img812.imageshack.us/img812/9467/xcodeoutlineview.png</a></p> <p>When using an NSOutlineView/NSTableView with bindings and an NSTreeController/NSArrayController, the <strong>view's columns get bindings assigned to</strong>, not the individual cells, for obvious reasons. If every row in a column uses the same cell, then it's a piece of cake. However if <strong>every row (potentially) uses its own cell type</strong> (and with that potentially its very own collection of bindings), then things get funky.</p> <p>Looking at the screenshot one can clearly see that the textfield cell needs just a single binding for "value". While the popup button cell needs at least one for "<strong>content</strong>", one for "<strong>contentValues</strong>" and last but not least one binding for "<strong>selectedIndex</strong> / <strong>selectedObject</strong> / <strong>selectedValue</strong>". And the checkbox cell needs a binding for "<strong>value</strong>" and (probably) one for "<strong>title</strong>".</p> <p>How would one accomplish this with as clean (and little) code as possible?<br> (<em>Or as one might ask:</em> <strong>How would Apple have done it</strong>?)</p> <p>… </p> <p>Here's what I've tried myself so far:<br> I provide the appropriate (copied) cells via <strong>[outlineView:dataCellForTableColumn:item:]</strong> and bind them to the individual data models (from [item representedObject]). I know the exact amount of data (< 500 rows) being displayed in the outline view, so having one cell per row shouldn't be too much of a memory issue, no? I got the <strong>data to get displayed properly</strong> via bindings (yay!) however I'm unable to change any of their values. O_o Apparently the value change simply never gets thru to the data model. Is there more to it than a simple <strong>[checkboxCell bind:@"value" toObject:rowModel withKeyPath:@"value" options:nil]</strong>? (as this seems <strong>sufficient</strong> for <strong>getting</strong> values, but not for <strong>setting</strong> them accordingly.)</p> <p>I couldn't find any information on this topic. Lots of info and hints for using custom cells per column, but none for using them on a "per row" basis. :(<br> This would make some great stuff for a Cocoa tutorial, wouldn't it? ;)</p>

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