I have an NSOutlineView subclass bound to a NSTreeController subclass which
is bound to a simple data model representing a hierarchical tree structure.
I've implemented drag and drop by having the view send a custom message to
my NSTreeController subclass who then updates the model. The problem is that
there is then a delay of about 1 second before the view displays the added
node.
I've noticed that if I move the mouse out of the OutlineView, then it seems
to update immediately. Any idea what I maybe doing wrong? Is it possible
that core data and all the observing patterns are really taking this long to
percolate the change back to the view? Am I supposed to do something to wake
up the view faster?
I'm using Leopard (10.5.2), XCode 3, Objective-C 2.0. I don't have any code
to deal with memory management. If I run with garbage collection
unsupported, the OutlineView never updates UNTIL I move the mouse out of the
OutlineView. If garbage collection is enabled, there is the 1 second delay.
With garbage collection supported, there are no errors or exceptions listed
in the console.
MyOutlineView has the following method
- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender {
NSPasteboard *pboard;
NSDragOperation sourceDragMask;
sourceDragMask = [sender draggingSourceOperationMask];
pboard = [sender draggingPasteboard];
if ( [[pboard types] containsObject:NSFilenamesPboardType] ) {
NSArray *files = [pboard propertyListForType:NSFilenamesPboardType];
if (myTreeController != NULL) {
[myTreeController addFiles:files];
}
}
return YES;
}
MyTreeController method is as follows:
- (void)addFiles:(NSArray *)droppedFilenames {
NSManagedObjectContext *moc = [self managedObjectContext];
for (NSString *name in droppedFilenames) {
NSManagedObject *bfile = [NSEntityDescription
insertNewObjectForEntityForName:@"bFiles" inManagedObjectContext:moc];
[bFile setName: name];
}
}
The model is:
Entity name: bFiles
Attribute: name
relationship: parent, optional, bFiles
relationship: child, optional, bFiles
I have MyTreeController nib configured with the following attributes
Keypaths: children = children
Options: avoid empty selection, preserve selection, select inserted objects
ObjectController:
Mode=Entity
Entity name = bFiles
Prepares content, editable
I have MyTreeController bound as follows:
Parameters, ManagedObjectContext
bind to File's Owner
Model key path = managedObjectContext
Raises for not applicable keys
I don't have my NSOutlineView bound to anything but I do have the contained
TableColumn bound as follows:
Value: bind to: Tree Controller
Controller Key = arrangedObjects
Model Key Path = name
Allows editing multiple value selection
Creates sort descriptor
Raises for not applicable keys
Thats about everything pertinent that I can think of. Any suggestions
appreciated.
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