Hi everybody,
I am stuck with a (maybe trivial) problem, but I did not find a
solution suitable for my case in the old messages and on the net.
My situation is this: I want to use a custom button cell inside an
OutlineView to add some color and text to the basic checkbox and draw
a set of Node objects. I would like to use a treecontroller to manage
my Nodes array and use a binding to link the cell value to a Node
property containing data like: color, enabled value, title string,
title string color, etc...
Trying to understand what to do I implemented this:
I subclassed NSButtonCell (MyCustomCell) and redefined
setRepresentedObject: and setObjectValue:
I created in IB an NSOutlineView, dragged in a NSButtonCell and set
the cell class to MyCustomCell. I set OutlineView delegate to
MyDocument and implemented in MyDocument
outlineView:willDisplayCell:forTableColumn:item:
I created a Node class with methods isLeaf: children: childrenCount:
and some custom properties (KVC compliant) like nodeName(NSString)
nodeColor(NSColor), nodeEnabled(bool).
I filled with some Node a NSMutableArray inside MyDocument and binded
it to a NSTreeController ContentArray via IB
Then I binded the tablecolumn Value to the TreeController using the
key "nodeEnabled". All worked fine and the normal button cells were
drawn correctly.
Then I tried to bind to the column the key "nodeColor". My idea is to
intercept the NSColor as it is set inside the cell and use it to do
some drawing.
The problem is that:
in MyCustomCell setRepresentedObject: is called only once with object
nil (not the displayed Node)
setObjectValue is called multiple times (once per visible cell) but
object value is always nil (not the color)
outlineView:willDisplayCell:forTableColumn:item: is called multiple
times but cell seems not a MyCustomCell instance but a simple
NSButtonCell. Calling [item representedObject] seems to return a valid
ptr to the displayed node, BUT after exiting the method I get an
assertion "Cannot create BOOL from object NSCalibratedRGBColorSpace 1
1 1 1 of class NSCachedRGBColor" and the OutlineView is not displayed
at all. I surely miss some basic understanding of cells/tables and
some methods implementation... :-(
How can I bind correctly a Node property (or a dictionary containing
more properties) to my custom cell inside the Outline view so that I
can use the properties to do some drawing/coloring? Is it possible
using bindings or I am totally out of the right path?
Sorry if I am not so clear but I am a total Cocoa newby.
Thanks in advance for any help or any pointer to interesting
documents...
Paull
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