Custom sections for enumerated objects of array in NSOutlineView - objective-c

Question

I am trying to create a NSOutlineVew with a custom header group (parent node) for listed objects. (NOTE: I have cell-based NSOutlineView). For example it look like as the Xcode "Navigator" or Numbers sidebar. I used the default groups for the separation properties per category, but it's looks like not as what I want. I need a parent node (cell), which I'll can visually adjust (add a controls elements and image).
I tried to do this by passing an array of objects to NSDictionary, giving each group a certain specific key. And a result, via NSLog everything is displayed correctly, but the transfer of this variable as the source for the program NSOulineView fails.
ProjectViewController.h
#interface ProjectViewController : NSViewController <NSOutlineViewDataSource, NSObject> {
IBOutlet NSOutlineView *outlineView;
FSEntity *content;
}
#property (readonly, assign) NSMutableArray *objects;
#end
ProjectViewController.m
#implementation ProjectViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Initialization code here.
// Setting default path to the local file or directory
NSString *home = NSHomeDirectory();
NSURL *url = [[NSURL alloc] initFileURLWithPath:home];
content = [[FSEntity alloc] initWithURL:url];
[self defineContentNSOutlineView];
NSLog(#"Array: %#",_objects);
// Basic сonfiguration an instance NSOutlineView
[self configurationNSOutlineView];
} return self;
}
#synthesize objects = _objects;
- (id)outlineView:(NSOutlineView *)outlineView child:(NSInteger)index ofItem:(id)item {
return (item == nil) ? [content.children objectAtIndex:index] : [((FSEntity *)item).children objectAtIndex:index];
}
- (BOOL)outlineView:(NSOutlineView *)outlineView isItemExpandable:(id)item {
return (item == nil) ? content.children.count > 0 : ((FSEntity *)item).children.count > 0;
}
- (NSInteger)outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item {
return (item == nil) ? content.children.count : ((FSEntity *)item).children.count;
}
- (id)outlineView:(NSOutlineView *)outlineView objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)item {
if ([item isKindOfClass:[FSEntity class]]) {
return [((FSEntity *)item) title];
}
return nil;
}
- (void)outlineView:(NSOutlineView *)outlineView willDisplayCell:(id)cell forTableColumn:(NSTableColumn *)tableColumn item:(id)item {
if ([cell isKindOfClass:[ImageAndTextCell class]]) {
ImageAndTextCell *textField = (ImageAndTextCell *)cell;
[textField setImage:[item icon]];
}
}
- (void)defineContentNSOutlineView {
NSMutableArray *objects = [NSMutableArray arrayWithObjects:[NSDictionary dictionaryWithObjectsAndKeys:#"FINDER", #"title", [NSArray arrayWithObjects:[NSDictionary dictionaryWithObject:content.children forKey:#"title"], nil], #"children",[NSNumber numberWithBool:YES], #"header", nil], nil];
_objects = objects;
}
- (void)configurationNSOutlineView {
[outlineView sizeLastColumnToFit];
[outlineView setFloatsGroupRows:NO];
[outlineView reloadData];
[outlineView expandItem:nil expandChildren:YES];
}
#end
To easier would imagine how it would look, I showed it on the scheme:
+--------------------------------------------+
| ▼ FINDER FILES ₪ ✱ |
| 03143553.file |
| ▶ Desktop |
| ▶ Documents |
| ▶ Downloads |
| ▶ Movies |
| ▶ Music |
| ▶ Pictures |
+--------------------------------------------+
and what I have now (NSOulineView without using NSTreeController);
+--------------------------------------------+
| 03143553.file |
| ▶ Desktop |
| ▶ Documents |
| ▶ Downloads |
| ▶ Movies |
| ▶ Music |
| ▶ Pictures |
+--------------------------------------------+
I know about the example Apple "SourceView", but I don't know how to add to the created group, array of objects (files and folders), NSTreeContoller display only the first elements of the hierarchy (without includes):
+--------------------------------------------+
| ▼ FINDER FILES |
| 03143553.file |
| Desktop |
| Documents |
| Downloads |
| Movies |
| Music |
| Pictures |
+--------------------------------------------+
Modified method of SourceView example:
- (void)addFinderSection {
[self addFolder:#"FINDER FILES"];
NSError *error = nil;
NSEnumerator *urls = [[[NSFileManager defaultManager] contentsOfDirectoryAtURL:self.url includingPropertiesForKeys:[NSArray arrayWithObjects: nil] options:(NSDirectoryEnumerationSkipsHiddenFiles) error:&error] objectEnumerator];
for (NSURL *url in urls) {
BOOL isDirectory;
if ([[NSFileManager defaultManager] fileExistsAtPath:[url path] isDirectory:&isDirectory]) {
if (isDirectory) {
[self addChild:[url path] withName:NO selectParent:YES];
} else {
[self addChild:[url path] withName:NO selectParent:YES];
}
}
}
[self selectParentFromSelection];
}
This method displays only the first objects, as shown it on the latter scheme.
And one more question, as I said before, how to add to the node ** "FINDER FILES" ** button to the right side of the cell.
Can you help me with this? I know, maybe is not so hard, but I just began learn Objective-C and I don't know how to do this. Thanks.

Answer 1

Based on the starting code you provided, I was able to get something working, using Cell-based NSOutlineViews. The code you posted seemed incomplete, so it was hard to know what exactly you wanted to get out of the missing FSEntity class. I just used foundation classes: NSArray for lists of nodes (i.e. root nodes and children), NSDictionaries for each node itself (both root nodes and sub-nodes), and NSURLs as the file-system reference. I tried to stay as close to your original code as possible. In the end, it looked something like this:
ProjectViewController.h
#interface ProjectViewController : NSViewController <NSOutlineViewDataSource, NSObject>
{
IBOutlet NSOutlineView *outlineView;
NSURL *content;
}
#end
ProjectViewController.m
#import "ProjectViewController.h"
#interface ProjectViewController () {
NSMutableArray* _objects;
}
#property (nonatomic, retain, readwrite) NSMutableArray* objects;
#end
#implementation ProjectViewController
#synthesize objects = _objects;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
// Initialization code here.
// Setting default path to the local file or directory
NSString *home = NSHomeDirectory();
content = [[NSURL alloc] initFileURLWithPath:home];
[self defineContentNSOutlineView];
NSLog(#"Array: %#",_objects);
// Basic сonfiguration an instance NSOutlineView
[self configurationNSOutlineView];
}
return self;
}
// nodes have 3 keys: title, url, icon
- (NSArray*)p_childrenForNode: (NSMutableDictionary*)node {
if (nil == node)
return self.objects;
NSArray* retVal = nil;
if (nil == (retVal = [node valueForKey: #"children"]))
{
NSMutableArray* children = [NSMutableArray array];
for (NSURL* urlInDir in [[NSFileManager defaultManager] contentsOfDirectoryAtURL: [node objectForKey: #"url"]
includingPropertiesForKeys: [NSArray arrayWithObjects: NSURLNameKey, NSURLEffectiveIconKey, nil]
options: 0
error: NULL])
{
id name = [urlInDir getResourceValue: &name forKey: NSURLNameKey error: NULL] ? name : #"<Couldn't get name>";
id icon = [urlInDir getResourceValue: &icon forKey: NSURLEffectiveIconKey error: NULL] ? icon : nil;
NSMutableDictionary* dict = [NSMutableDictionary dictionaryWithObjectsAndKeys: urlInDir, #"url", name, #"title", nil];
if (icon)
[dict setObject: icon forKey: #"icon"];
[children addObject: dict];
}
retVal = children;
if (children)
[node setValue: children forKey: #"children"];
}
return retVal;
}
- (id)outlineView:(NSOutlineView *)outlineView child:(NSInteger)index ofItem:(id)item {
NSMutableDictionary* itemDict = (NSMutableDictionary*)item;
NSArray* children = [self p_childrenForNode: itemDict];
return children.count > index ? [[[children objectAtIndex: index] retain] autorelease] : nil;
}
- (BOOL)outlineView:(NSOutlineView *)outlineView isItemExpandable:(id)item {
NSMutableDictionary* itemDict = (NSMutableDictionary*)item;
NSArray* children = [self p_childrenForNode: itemDict];
return children.count > 0;
}
- (NSInteger)outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item {
NSMutableDictionary* itemDict = (NSMutableDictionary*)item;
NSArray* children = [self p_childrenForNode: itemDict];
NSInteger retVal = children.count;
return retVal;
}
- (id)outlineView:(NSOutlineView *)pOutlineView objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)item {
NSImage* icon = [item objectForKey: #"icon"];
NSString* title = [item objectForKey: #"title"];
id value = nil;
if (icon) {
[icon setSize: NSMakeSize(pOutlineView.rowHeight - 2, pOutlineView.rowHeight - 2)];
NSTextAttachment* attachment = [[[NSTextAttachment alloc] init] autorelease];
[(NSCell *)[attachment attachmentCell] setImage: icon];
NSMutableAttributedString *aString = [[[NSAttributedString attributedStringWithAttachment:attachment] mutableCopy] autorelease];
[[aString mutableString] appendFormat: #" %#", title];
value = aString;
} else {
value = title;
}
return value;
}
- (void)defineContentNSOutlineView {
// Make root object
NSMutableDictionary* rootObj = [NSMutableDictionary dictionaryWithObjectsAndKeys:
#"FINDER", #"title",
content, #"url",
nil];
id icon = [content getResourceValue: &icon forKey: NSURLEffectiveIconKey error: NULL] ? icon : nil;
if (icon)
[rootObj setObject: icon forKey: #"icon"];
// Set it
self.objects = [NSMutableArray arrayWithObject: rootObj];
}
- (void)configurationNSOutlineView {
[outlineView sizeLastColumnToFit];
[outlineView setFloatsGroupRows:NO];
[outlineView reloadData];
[outlineView expandItem:nil expandChildren:YES];
}
#end
I posted the whole, working sample project to GitHub.