class QTableView provide 3 interfaces for setDelegate:
setItemDelegate -- set delegate for whole QTableView
setItemDelegateForRow -- set delegate for given row
setItemDelegateForColumn -- set delegate for given column
question: if I just want to set delegate for a cell, how can I make it?
Related
I have a storyboard that contains a main window (with a corresponding MainWindowController class), and a main view (an NSSplitViewController, with corresponding MainViewController class). For certain functionality I am attempting to set the delegate of the NSSplitView contained in the view to the MainWindowController class.
Without any IB linkage, the NSSplitView delegate is already set to the MainViewController at application launch. I am able to get a reference to the MainWindowController, but when I attempt to set the delegate to the window controller (which does implement NSSplitViewDelegate), I am getting the following:
*** Assertion failure in -[NSSplitView setDelegate:], /Library/Caches/com.apple.xbs/Sources/AppKit/AppKit-1404.34/AppKit.subproj/NSSplitView.m:600
This also happens if I attempt to set the delegate to nil.
Does anyone know why this might be so, whether there are restrictions on setting delegates, and if there is a way to use IB to set the delegate of an item in a view to another Controller?
Thanks.
I don't have a reference for this but I'm pretty sure the split view and the split view controller aren't meant to be separated. Fortunately, NSSplitViewController mirrors the delegate methods, giving you a chance to intervene. There should therefore be no reason to change the split view's delegate.
A .nib file contains NSOutlineView (1-column, view-based). Column has identifier "UserCell"; it also has one cell which has two NSTextField's and bunch of buttons; this cell also has identifier "UserCell". Class for this cell is set in IB to be a custom class derived from NSTableCellView class. I option-dragged both NSTextField's to the custom code (see picture attached) to create IBOutlets.
In delegate's method -outlineView:viewForTableColumn:item: I load cell using -makeViewWithIdentifier:owner: and it loads fine - I get my custom cell view object. However, both text fields are nil's.
How one should fix it? The same story with NSTableView.
How to configure a view-based NSTableView to behave like so:
Rows are selectable
The user are unable to trigger edit mode by clicking a cell
Edit mode can be triggered by calling NSTableView-editColumn:row:withEvent:select: programmatically
The table view is dragged from the object library of Xcode interface builder, i.e., it uses an NSTableCellView (with an NSImageView and an NSTextField as its subviews) as the table view's cell view.
For view-based table views, -editColumn:row:withEvent:select: is relatively ineffective. It attempts to make the cell view the first responder for the window, but only certain views will accept first responder status. NSTableCellView does not, because it is not itself editable.
If you want to programmatically initiate editing in the text field within an NSTableCellView, you can do something like:
NSTableCellView* cellView = (NSTableCellView*)[tableView viewAtColumn:col row:row makeIfNecessary:YES];
if ([cellView.textField acceptsFirstResponder])
[cellView.window makeFirstResponder:cellView.textField];
To disable the user from starting editing through the UI, I think you will need to set the text field to not be editable. You would make it editable just before you initiate editing programmatically. For example, add a line cellView.textField.editable = YES; between the above two lines.
Then, you'll want to set it back to non-editable after editing ends. To do this, you can set the delegate of the text field to your controller object and implement -controlTextDidEndEditing:. Or, similarly, you can add an observer of the NSControlTextDidEndEditingNotification notification from the text field. Either way, when your code is called, you set the text field's editable property back to false. (If you don't otherwise have a reference to the text field in question, you can obtain it from the NSNotification's object property.)
I set NSButtonCell as a cell type in a Table Column in my NSTableView.
I implemented an IBAction method, but I can't wire it with NSButtonCell in IB - the wire don't want to highlight a button from NSTableView.
How to connect a method with NSButtonCell? Or maybe there'se another way to handle its click event?
Thanks
You should be able to wire up a connection from the cell by control+dragging to any object in your NIB. Just make sure the cell is actually selected, and that your action is defined as an IBAction in the object's header file. In your action method you can determine which row was selected by calling [tableView clickedRow].
Edit: Here's a demonstration. Make sure you click at least four times on the check box to get it selected, hold down the control key and drag from the cell to your object.
I've just created my first view-based NSTableView in Interface Builder and I've correctly set up the data source and the bindings to update the views in the tableview. Each view has two labels and a NSProgressIndicator. Updating the progress indicator through the bindings and the data source works perfectly, but I'd like to change its state from determinate to indeterminate at some time. As my NSTableCellView subclass has access to the progress indicator, how can I get access to the cell view at a given row index? I've tried calling viewAtColumn:row:makeIfNecessary: on the tableview with both NO and YES for the makeIfNecessary argument, but neither seems to work.
Solution 1: In your NSTableCellView subclass add a property (IBOutlet) for your NSProgressIndicator control. Wire it in IB to set the property when the view is loaded. You can then access the progress control in your cell view subclass by using the property.
Solution 2: In IB give your NSProgressIndicator a unique integer tag. In your cell view subclass use [self viewWithTag:] to get the object.
I am not sure about the answer to your main question but you can bind the indeterminate state as well. In IB Is Indeterminate is listed in the Parameters section.