Hi All,
I think this is an easy issue...for those with more knowledge than
I :) but it has had me stumped for a while now.
I am puzzled about one of the calls (the "invalidateGraphic method")
of the setter of the NSArray (_graphics) in the document.m file. The
sequence occurs when data is read from an (archived) saved file. The
sequence, I believe, goes like this.
- (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:
(NSError **)outError {
....set up stuff.......
[self setGraphics:graphics];
Which calls:
- (void)setGraphics:(NSArray *)graphics {
unsigned i = [_graphics count];
while (i-- > 0) {
[self removeGraphicAtIndex:i];
}
i = [graphics count];
while (i-- > 0) {
[self insertGraphic:[graphics objectAtIndex:i] atIndex:0];
}
}
which calls
- (void)insertGraphic:(SKTGraphic *)graphic atIndex:(unsigned)index {
[[[self undoManager] prepareWithInvocationTarget:self]
removeGraphicAtIndex:index];
[_graphics insertObject:graphic atIndex:index];
[graphic setDocument:self];
[self invalidateGraphic:graphic];
and the part that I do not get:
- (void)invalidateGraphic:(SKTGraphic *)graphic {
NSArray *windowControllers = [self windowControllers];
[windowControllers makeObjectsPerformSelector:@selector
(invalidateGraphic:) withObject:graphic];}
I **think** I see what each line is doing, but, fail to grasp the
overall essence of the call.
Thanks in advance.
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