Re: drawing NSTextFieldCell nested inside NSTextFieldCell subclass causes crash
Re: drawing NSTextFieldCell nested inside NSTextFieldCell subclass causes crash
- Subject: Re: drawing NSTextFieldCell nested inside NSTextFieldCell subclass causes crash
- From: Dan Donaldson <email@hidden>
- Date: Fri, 20 Oct 2006 13:03:34 -0400
This is the implementation I used:
- copyWithZone:(NSZone *)zone {
DDDoubleTextFieldCell * cell = (DDDoubleTextFieldCell *)[super
copyWithZone:zone];
cell->cellTitle = [cellTitle retain];
cell->titleField = [titleField retain];
return cell;
}
however, the line cell->titleField = [titleField retain]; causes a
crash for reasons not clear to me.
Dan Donaldson
416 604 3398
email@hidden
On 20-Oct-06, at 6:44 AM, Mike Abdullah wrote:
Have you properly implemented your new cell's copyWithZone:
method? NSCells get copied a lot when being drawn. If you don't
implement this, the table view will copy your cell incorrectly and
screw up your memory management.
Mike.
On 19 Oct 2006, at 21:13, Dan Donaldson wrote:
I have an NSTextField subclass. Its function is to provide a cell
with two vertically stacked text areas in one cell.
Things are generally working ok, its being instantiated, put into
a column in an NSOutlineView. I've shifted the default text area
down 18.0 pixels, to leave space for the upper textfield. This is
an NSTextFieldCell, stored in an instance variable called
titleField in the cell. This is being created on init of the cell,
and that's confirmed using NSLog.
When I try to draw the extra cell, I use this:
// -----------------------------
- (void) drawWithFrame:(NSRect)cellFrame inView:(NSView *)
controlView {
NSSize titleSize;
NSRect titleFrame;
titleSize.width = 300.0;
titleSize.height = 18.0;
NSDivideRect
(cellFrame,&titleFrame,&cellFrame,titleSize.height,NSMinYEdge);
NSLog(@"frames: \rcell x: %f y: %f w:%f h:%f \r\r title: x: %f y:
%f w:%f h:%f",
cellFrame.origin.x, cellFrame.origin.y,
cellFrame.size.width, cellFrame.size.height,
titleFrame.origin.x, titleFrame.origin.y,
titleFrame.size.width, titleFrame.size.height);
if ( titleField != nil) {
[titleField drawWithFrame:titleFrame inView:controlView];
}
[super drawWithFrame:cellFrame inView:controlView];
}
and the application crashes. I'm not very experienced with Cocoa,
but this seems reasonable. The frames are both there, but it isn't
working...nothing has been done with titleFrame except alloc/init/
autorelease. cellSize is being used to manipulate the row height
correctly.
Help (please)...
Dan Donaldson
416 604 3398
email@hidden
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