How do I make the NSCollectionView update to show the currently selected item using an NSBox? Displaying selection in a list seems like a basic thing, but I'm having all kinds of trouble with this.
I've read this question and also looked at the sample code from Apple. There seems to be several ways to do this.
Using a subclasses of NSCollectionViewItem and special "prototype view".
Using a NSBox.
I wish to use the NSBox way since it seems simples and is also used in the official code sample.
It's apparently done as described in the following quote by alternegro:
If a different background color will suffice as a highlight, you could
simply use an NSBox as the root item for you collection item view.
Fill the NSBox with the highlight color of your choice. Set the NSBox
to Custom so the fill will work. Set the NSBox to transparent.
Bind the transparency attribute of the NSBox to the selected attribute
of File Owner(Collection Item) Set the value transformer for the
transparent binding to NSNegateBoolean.
I'm stuck at the very first part: "use an NSBox as the root item for you (sic) collection item view". I've tried to change the "Custom Class" to a FoobarBox that inherits from NSBox, but it doesnt seems to help as I cannot change the background color to blue nor can I bind the transparency. Any pointers on how to make the selection display in my NSCollectionVuew would be appreciated.
First, create a class for your ListView that inherits from NSBox
#interface MyListViewBox : NSBox
#property (unsafe_unretained) IBOutlet NSCollectionViewItem *controller;
#end
Then, in Interface Builder, specify your class name as "Custom class" property as shown on my screenshot
Then you will realize IB does not show NSBox properties or binding in the GUI (at least with version 4.5.2), so I decided to change the properties programmatically.
Create an outlet for NSCollectionViewItem in your NSBox subclass (as seen above)
Use IB to link the outlet to your NSCollectionItemView
in -(void)awakeFromNib for your NSBox subclass, add the following code
-(void)awakeFromNib {
//properties are not showing up in XCode Inspector IB view
//configuring the box here :-(
self.boxType = NSBoxCustom;
self.borderType = NSLineBorder;
self.fillColor = [NSColor selectedControlColor];
//bind the "transparent" property of NSBox to the "selected" property of NSCollectionViewItem controller
//controller is bound as IBOutlet in IB
NSValueTransformer* transformer = [NSValueTransformer valueTransformerForName:NSNegateBooleanTransformerName];
[self bind:#"transparent"
toObject:self.controller
withKeyPath:#"selected"
options:[NSDictionary dictionaryWithObjectsAndKeys:transformer, NSValueTransformerBindingOption, nil]];
}
In XCode 4.5.2, you can just delete the NSView that comes automatically with the NSColletionView and drag in an NSBox (which will have all the appropriate bindings available). Make sure you re-bind the CollectionView to your new Box.
Related
Suppose there is a window which has two NSTextViews in it, and each of them uses the findBar.
The problem is that after closing one find bar (finishing the finding) the cursor jumps to the other textView, i.e. the focus does not return the the textView for which the find operation originated.
Please, does anyone know how to make it return to the original view?
This is a screenshot of one simple setup:
You can assign the nextKeyView property in StoryBoards (see image below) to assign where you want to the focus to "jump", otherwise, if you need to assign the nextKeyView property programmatically (when the view is initialized), you can do so using the nextKeyView property available via the NSView class. Both methods are hinted at below:
1. Assign the nextKeyView programmatically via this property
#property(assign) NSView *nextKeyView;
2. Or you can assign the nextKeyView in storyboards
Hope this helps!
Set the nextKeyView property of the text field back to the original view.
You can create the subclass of textview and mention the same inside your interface builder->Custom class and inside your custom textview class override the below method:-
-(BOOL)becomeFirstResponder
{
return YES;
}
For my registration form, I am currently using a UITableView which isn't fullscreen and I add cells programmatically through hardcoding the datasource methods. By the time the whole class got very complex and huge.
Pastebin link
The cells are custom and have a UILabel and a UITextfield. Now one of the cells should have a button instead of the textfield. This would make the whole thing more complex then it should be, in my opinion. So my thought was using the static feature of the tableview in the storyboard. But this requiers a UITableViewController, if I use one the TableView is always fullscreen. Is there a way to se the static feature without a fullscreen TableView??
If you have a fixed number of cells, the static table view controller is a good option. Instead of implementing the datasource methods, as you mentioned, you can include each input field as an IB outlet.
If you want a static table view controller that is not full-width, embed the table view controller inside a container view.
For example, create a new view controller, add a container view object w/ the desired width in this new view controller, and then connect your static table view controller to the container view.
Note that the static table view controller becomes a childViewController of the enclosing view controller. You can facilitate access to the textFields from the enclosing view controller w/ a weak property to the textFields w/in the child view controller.
- (UITextField *)surnameTextField
{
UITextField *textField;
// reference childController that is initiated via containerView
if ([[self.childViewControllers lastObject] isKindOfClass:[NameViewController class]])
{
NameViewController *nameVC = [self.childViewControllers lastObject];
textField = nameVC.surnameTextField;
}
return textField;
}
You do not need to use a UITableViewController. Just drag and drop a table view from the control palette onto a UIViewController in your storyboard. Size and position it how you want to and add any other controls to the UIViewController that you need.
In the property sheet for the UITableView set the content type to 'Static Cells' then define your cells how you want them.
How can one subclass an NSScrollView's DocumentView in order to do some custom drawing? I need to do some work with NSShadow inside of the scroll view.
The document view is just a normal view (subclass of NSView,) so all you have to do is to create a view, either programmatically or in Interface Builder, and set the scroll view's documentView property to the new view.
You can set the property in a suitable awakeFromNib method, for instance.
I'm trying to create a custom button look.
From what I've gathered, NSButtonCell does the drawing, so I should actually be overwriting that instead.
But the issue is, my CustomButton class has other things like NSImage, mIsMouseOver etc. Currently the drawing is being done in the CustomButton class but I want to move it over to the cell.
question is, is there anyway I can access the image in the customButton class from the customButtonCell class so that I may use [image drawInRect:...]?
Regards,
Han
Your cell's drawWithFrame:(NSRect)frame inView:(NSView *)controlView method includes a reference to the NSView being drawn from which you can access the view's properties (such as image).
Usual way is to store the data in the NSCell subclass. Base cell class even has an -(id)image property, so, your button class should call [[self cell] image] when it is queried for image.
Actually, since you are subclassing NSButton, it contains all you need, just override cell's drawing methods. And if you need an extra property - define it in the cell, wrap in the control.
I'm trying to create a file explorer using nscollectionview and am currently implementing a right click menu for each item (i.e. copy/delete/rename/etc). I currently have:
An NSCollectionView linked with an NSArrayController which holds a custom object
A subclass of NSBox as the view for each item, this also tracks mouse events and passes them to the controller
The controller has an NSMenu outlet (rcMenu) and also an NSView outlet (itemView) for the NSBox subclass that should be where the menu popup
The code for calling the menu is:
[NSMenu popUpContextMenu:rcMenu withEvent:event forView:itemView];
Once run, this works in that the menu pops up when right clicking the item in the collection view, but on inspecting the event that's passed to the controller, there's not really anything I could use to find out which item was right clicked other than the x,y coordinates (which seem to be for the NSWindow rather than the item or NSCollectionView). What I really want is the object in the NSArrayController that had it's view right clicked.
Is this down to me setting it up incorrectly, is there an easy way to figure it out, or is it just that tough to work it out?
You might try setting the menu of each collection view item's view. Most likely, you'll do this by overriding +defaultMenu in your item view class. Once you do that, comment out the popUpContextMenu:withEvent:forView: message and see whether you can get away without it.
Furthermore, it would then not be too hard to serve up different menus for different kinds of items (e.g., folders vs. packages vs. files, and different types of files at that). You'd probably have to override -menuForEvent: instead of +defaultMenu.
I found an other solution that might help.
For this solution I made a subclass of NSCollectionViewItem and NSView, respectively (and for the ease of explaining) ItemViewController and ItemView.
I'm assuming you work with IB where you have already bound your NSCollectionView to the ContentArray of your NSArrayController (also bind the selectionIndexes).
Next add an ViewController object to the NIB and make sure its custom class is set to the ItemViewController. Now connect it to the itemPrototype outlet of your NSCollectionView.
Next add a Custom View object to the NIB and set its custom class to ItemView. Connect its outlet to the view property of your ItemViewController.
In the interface file of ItemView create a representedObject-like property. With this I mean something like:
#property (nonatomic, assign) id someRepresentedObjectPropertyName
This will be the property which will represent the item in your NSArrayController.
Now go to the implementation file of ItemViewController and override the -setRepresentedObject: method. In here we will first let the ItemViewController handle setting its representedObject, afterwards we assign the same representedObject to the property we made in ItemView. The override would look like:
-(void)setRepresentedObject:(id)representedObject {
[super setRepresentedObject:representedObject];
//Do some appropiate checking on the representedObject...
if (self.view != nil) {
[(ItemView *)self.view setSomeRepresentedObjectPropertyName:self.representedObject];
}
}
Now if you go back to the implementation of ItemView you can override the method -rightMouseUp: and build/set-up a NSMenu there and use the -popUpMenuPositioning...: method. The someRepresentedObjectPropertyName property of ItemView should be set to the correct item in your NSArrayController.
EDIT:
Instead of overriding -setRepresentedObject you could also bind the ItemView's someRepresentedObjectPropertyName to representedObject.someRepresentedObjectPropertyName