NSMatrix disappears

FROM : Ender Wiggins
DATE : Sat Jul 15 23:11:50 2006

I have an NSMatrix of NSButtons and one of NSImageCell's and when I
place them in my NSView and compile my app, I can see them fine (even
though they don't work because the custom class is set to NSMatrix).

But when I set the custom class to a class I subclassed from NSMatrix
and recompile my app, the buttons and cells do not appear in my view,
yet they still work fine if I click in their areas. The images in
either NSMatrix work as my drag source and the drag operation works
fine even though I can't see them.

Any one have any ideas as to why this is? Any help much appreciated.

--- *.m

#import "ToolsPalette.h"

@implementation ToolsPalette

- (id)initWithFrame:(NSRect)frameRect
{
   if ((self = [super initWithFrame:frameRect]) != nil) {
   }
   
   return self;
}

- (void)drawRect:(NSRect)rect
{ }

- (BOOL)shouldDelayWindowOrderingForEvent:(NSEvent *)event
{
    return YES;
}

- (BOOL)ignoreModifierKeysWhileDragging
{
   return YES;
}

- (BOOL)acceptsFirstMouse:(NSEvent *)event
{
    return YES;
}

- (void)mouseDown:(NSEvent *)event
{
    [self setDownEvent:event];
}

- (void)mouseDragged:(NSEvent *)event
{
    int row, column = 0;

    if ([self getRow:&row column:&column forPoint:[self
           convertPoint:[event locationInWindow] fromView:nil]]) {
           
        [self initiateDrag:downEvent];
    }
   
    [self setDownEvent:nil];
}

- (NSEvent *)downEvent
{
    return downEvent;
}

- (void)setDownEvent:(NSEvent *)event
{
    [downEvent autorelease];
    downEvent = [event retain];
}

- (void)initiateDrag:(NSEvent *)event
{
   int row, column = 0;

    NSPasteboard *pb = [NSPasteboard pasteboardWithName: NSDragPboard];
    NSImage *dragImage;
    NSImage *scaledImage;
    NSPoint dragPoint;
   NSRect theDraggedCellFrame;

    [self getRow:&row column:&column forPoint:
       [self convertPoint:[event locationInWindow] fromView:nil]];
   
    scaledImage = [[self cellAtRow:row column:column] image];

    theDraggedCellFrame = [self cellFrameAtRow:row column:column];

    dragPoint = NSMakePoint(theDraggedCellFrame.origin.x +
       ([self cellSize].width - [scaledImage size].width) / 2,
       theDraggedCellFrame.origin.y +
       [scaledImage size].height +
       ([self cellSize].height - [scaledImage size].height) / 2);

    [pb declareTypes: [NSArray arrayWithObjects: NSTIFFPboardType, nil]
       owner: self];
    [pb setData:[scaledImage TIFFRepresentation] forType:NSTIFFPboardType];

    dragImage = [[[NSImage alloc]
       initWithSize: [scaledImage size]] autorelease];
   [dragImage setName:@"testing"];
       
    [dragImage lockFocus];
    [scaledImage dissolveToPoint: NSMakePoint(0,0) fraction: .5];
    [dragImage unlockFocus];

    [self dragImage: dragImage
       at: dragPoint
       offset: NSMakeSize(0,0)
        event: event
        pasteboard: pb
        source: self
        slideBack: YES];
}

@end

--- *.h

#import <Cocoa/Cocoa.h>

@interface ToolsPalette : NSMatrix
{
   @private
   NSEvent *downEvent;
}

- (void)drawRect:(NSRect)rect;
- (BOOL)shouldDelayWindowOrderingForEvent:(NSEvent *)theEvent;
- (BOOL)acceptsFirstMouse:(NSEvent *)theEvent;
- (BOOL)ignoreModifierKeysWhileDragging;
- (void)mouseDown:(NSEvent *)theEvent;
- (void)mouseDragged:(NSEvent *)event;
- (void)setDownEvent:(NSEvent *)event;
- (NSEvent *)downEvent;
- (void)initiateDrag:(NSEvent *)event;

@end