nscollectionview

问题 I've understood the fly-weight approach of cell-based NSTableView and I think I understand the differences with NSCollectionView. Differences between (cell-based) NSTableView and NSCollectionView However, a bit less obvious is the differences between view-based NSTableView and NSCollectionView. With NSCollectionView's flexibility in displaying its items (i.e. in a grid layout) which could emulate a tableView's list (a grid with maximum one column) and excluding personnal preferences, why

问题 I programmatically select a item in my NSCollectionView. The item is selected as expected but the view doesn't scroll automatically to this item. [collectionView setSelectionIndexes:[NSIndexSet indexSetWithIndex:compt]]; How to scroll to the selected item ? 回答1: Find the answer here NSScrollView: Make sure frame is visible This code worked for me : NSRect selectionRect = [self.collectionView frameForItemAtIndex:[[self.collectionView selectionIndexes] firstIndex]]; [self.collectionView

问题 I have an NSCollectionView that contains a collection of CustomViews . Initially it tiled the subviews into columns and rows like a grid. I then set the Columns property in IB to 1, so now it just displays them one after another in rows. However, even though my CustomView is 400px wide, it's set to autoresize, the NSCollectionView is 400px wide, and it's set to 1 column, the subviews are drawn about 80px wide. I know I can get around this by calling: CGFloat width = collectionView.bounds.size

问题 I have an NSCollectionView that contains a collection of CustomViews . Initially it tiled the subviews into columns and rows like a grid. I then set the Columns property in IB to 1, so now it just displays them one after another in rows. However, even though my CustomView is 400px wide, it's set to autoresize, the NSCollectionView is 400px wide, and it's set to 1 column, the subviews are drawn about 80px wide. I know I can get around this by calling: CGFloat width = collectionView.bounds.size

问题 I have a working NSCollectionView with one minor, but critical, exception. Getting and highlighting the selected item within the collection. I've had all this working prior to Snow Leopard, but something appears to have changed and I can't quite place my finger on it, so I took my NSCollectionView right back to a basic test and followed Apple's documentation for creating an NSCollectionView here: http://developer.apple.com/mac/library/DOCUMENTATION/Cocoa/Conceptual/CollectionViews

问题 Learning with Swift and I've been at this all day with little progress: Need to know when an item in NSCollectionView is selected. The end goal is to get the item to highlight and to be able to delete it from the collection with the delete key. My NSCollectionView is bound to an ArrayController to get content and send the selection indexes, so looks like I need to be watching the ArrayController for a selection change, but don't see any helpful delegate methods there. The prototype view has a

问题 I am wanting something similar to how iWork has the template selection screen for Pages when you can select different templates, and each view contains different info has difference sizes etc. I have tried subclassing NSCollectionView and determining which view to display using the newItemForRepresentedObject method (as opposed to using itemPrototype view Interface Builder), but it for some reason doesn't position the views correctly, and it does not show the correct number of views for the

问题 I have an NSCollectionView with a vertical NSCollectionViewFlowLayout . I display rectangular icons in it. I also have a slider in the UI, and when that changes, I adjust the minItemSize , which I then use in collectionView:itemForRepresentedObjectAtIndexPath: to create an equally sized NSImageView to the returned NSCollectionViewItem 's imageView . Then I reload the view by invoking reloadData . After that, the view shows the icons in the new size as intended. The problem is, provided I have

问题 I have a NSTextField on the view of an NSCollectionViewItem . When you click an NSCollectionViewItem the item is selected. When you click the NSTextField it gains focus, but the NSCollectionViewItem which is behind the text field does not get selected. I want to change this last behaviour so the text field gets focus and the view item also gets selected. What's the best way to do this? 回答1: I believe you would have to subclass NSTextField and override mouseDown to pass the event to the

问题 I have these two classes: @interface Father : NSObject { NSString* name; NSArray* listChildren; } @property (copy, readwrite) NSString* name; @property (copy, readwrite) NSArray* listChildren; @end @interface Child : NSObject { NSString* nameChild; NSImage* picture; } @property (copy, readwrite) NSString* nameChild; @property (copy, readwrite) NSImage* picture; @end I'm trying to make a NSCollectionView filled with Father items, and for each father item's View i will have a name label, and