I have a window with a Source List (NSOutlineView). My source list has just two levels. Level one is header and level two is data. I want to have a contextual menu on some of the data cells. Not all.
First, I try to attach a menu on the table cell view who represents the data cell -> nothing happens.
Second, I attach a menu on the Outline View in IB -> the contextual menu opens on each cells (header and data). I search for stopping the opening of the menu, but I don't find anything.
Do you have some ideas ?
Thank you
OS X 10.8.2 Lion, Xcode 4.5.2, SDK 10.8
If you subclass NSOutlineView, you can override menuForEvent:
to return a menu only if the user clicked on the correct row. Here's an example:
- (NSMenu *)menuForEvent:(NSEvent *)event;
{
//The event has the mouse location in window space; convert it to our (the outline view's) space so we can find which row the user clicked on.
NSPoint point = [self convertPoint:[event locationInWindow] fromView:nil];
NSInteger row = [self rowAtPoint:point];
//If the user did not click on a row, or is not exactly one level down from the top level of hierarchy, return nil—that is, no menu.
if ( row == -1 || [self levelForRow:row] != 1 )
return nil;
//Create and populate a menu.
NSMenu *menu = [[NSMenu alloc] init];
NSMenuItem *delete = [menu addItemWithTitle:NSLocalizedString( @"Delete", @"" ) action:@selector(delete:) keyEquivalent:@""];
[self selectRowIndexes:[NSIndexSet indexSetWithIndex:row] byExtendingSelection:NO];
//Set the Delete menu item's represented object to the clicked-on item. If the user chooses this item, we'll retrieve its represented object so we know what to delete.
[delete setRepresentedObject:[self itemAtRow:row]];
return menu;
}
This assumes we're compiling with ARC, so you don't need to autorelease the menu object being created.
This extension + subclass (both NSOutlineView and NSTableView) does the sensible thing of seeing whether a menu is attached to a cell view or row view. Just a general, reusable subclass!
Set the menu on the cell view in outlineView:viewForTableColumn:item:
– menu
is a NSResponder property.
(Below is in Swift)
// An extension lets us both subclass NSTableView and NSOutlineView with the same functionality
extension NSTableView {
// Find a cell view, or a row view, that has a menu. (e.g. NSResponder’s menu: NSMenu?)
func burnt_menuForEventFromCellOrRowViews(event: NSEvent) -> NSMenu? {
let point = convertPoint(event.locationInWindow, fromView: nil)
let row = rowAtPoint(point)
if row != -1 {
if let rowView = rowViewAtRow(row, makeIfNecessary: true) as? NSTableRowView {
let column = columnAtPoint(point)
if column != -1 {
if let cellView = rowView.viewAtColumn(column) as? NSTableCellView {
if let cellMenu = cellView.menuForEvent(event) {
return cellMenu
}
}
}
if let rowMenu = rowView.menuForEvent(event) {
return rowMenu
}
}
}
return nil
}
}
class OutlineView: NSOutlineView {
override func menuForEvent(event: NSEvent) -> NSMenu? {
// Because of weird NSTableView/NSOutlineView behaviour, must set receiver’s menu otherwise the target cannot be found
self.menu = burnt_menuForEventFromCellOrRowViews(event)
return super.menuForEvent(event)
}
}
class TableView: NSTableView {
override func menuForEvent(event: NSEvent) -> NSMenu? {
// Because of weird NSTableView/NSOutlineView behaviour, must set receiver’s menu otherwise the target cannot be found
self.menu = burnt_menuForEventFromCellOrRowViews(event)
return super.menuForEvent(event)
}
}
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