Updating NSMatrix selection bindings (custom selection behavior)
Updating NSMatrix selection bindings (custom selection behavior)
- Subject: Updating NSMatrix selection bindings (custom selection behavior)
- From: "Lawrence Sanbourne" <email@hidden>
- Date: Mon, 17 Apr 2006 16:21:18 -0500
Hello,
I've created an NSMatrix subclass that re-implements -mouseDown so
that I can support drag and drop in the future. (This was previously
described at <http://www.cocoabuilder.com/archive/message/cocoa/2004/6/24/110438>.)
I've also changed the selection behavior to match what iPhoto does
when the user shift-clicks. My code is at the bottom of this message.
The problem is that the bound controller isn't getting updated. (It's
bound to NSMatrix's selectedObjects key.) So I figured I needed to
override NSMatrix's selection modification methods and notify the
bound controller, but this isn't doing the trick. I'm calling this
method from each overridden selection modification method:
- (void)updateSelectionBindings {
int selectedCellPos = [self selectedRow] * [self numberOfColumns] +
[self selectedColumn];
NSCell *selectedCell = [self cellAtRow:[self selectedRow]
column:[self selectedColumn]];
[[observedObjects objectForKey:@"selectedIndex"] setValue:[NSNumber
numberWithInt:selectedCellPos] forKey:[keyPaths
objectForKey:@"selectedIndex"]];
[[observedObjects objectForKey:@"selectedObject"]
setValue:[selectedCell objectValue] forKey:[keyPaths
objectForKey:@"selectedObject"]];
[[observedObjects objectForKey:@"selectedTag"] setValue:[NSNumber
numberWithInt:[selectedCell tag]] forKey:[keyPaths
objectForKey:@"selectedTag"]];
[[observedObjects objectForKey:@"selectedValue"]
setValue:[selectedCell objectValue] forKey:[keyPaths
objectForKey:@"selectedValue"]];
// ...
}
So, I think I don't understand how bindings work under the hood. How
should I be fixing my selection problems?
Looking forward to any help!
Larry
The -mouseUp code, as promised:
// Reference: http://www.cocoadev.com/index.pl?DragMatrix
- (void)mouseUp:(NSEvent *)theEvent {
int clickedRow, clickedCol;
// Send event to super if there was no accompanying down event (i.e.,
drag started) or if the clicked area isn't in the view.
if (![self downEvent] || ![self getRow:&clickedRow column:&clickedCol
forPoint:[self convertPoint:[theEvent locationInWindow]
fromView:nil]]) {
[super mouseUp:theEvent];
return;
}
if ([theEvent modifierFlags] & NSCommandKeyMask) {
int position = clickedRow * [self numberOfColumns] + clickedCol;
[self addSelectedCellAtPosition:position];
} else if ([theEvent modifierFlags] & NSShiftKeyMask && [self
selectedRow] != -1 && [self selectedColumn] != -1) {
int lastSelectedPosition = [self selectedRow] * [self
numberOfColumns] + [self selectedColumn];
int clickedPosition = clickedRow * [self numberOfColumns] + clickedCol;
// Loop forwards or backwards depending on where clickedPosition is
in relation to lastSelectedPosition.
int delta = (lastSelectedPosition > clickedPosition ? 1 : -1);
// Select everything in between lastSelectedPosition and clickedPosition.
int position;
for (position = clickedPosition; (delta > 0 && position <
lastSelectedPosition) || (delta < 0 && position >
lastSelectedPosition); position += delta) {
[self addSelectedCellAtPosition:position];
}
} else {
[self selectCellAtRow:clickedRow column:clickedCol];
}
}
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