[Drawkit] permanent objects

[Graham Cox]

Hi James,

What is your object based on? If you base it on a DKDrawableObject,  
you can simply lock it [shape setLocked:YES] which will prevent it  
being moved, edited or deleted. It can still be selected but you can  
override the -drawContentInSelectedState: to ignore the flag for  
selected which will stop it showing the selection highlight.

If you are just drawing it yourself in a custom layer (an equally  
valid approach), then it's entirely private to you and won't be  
deleteable or editable unless you make it so.

I do use NSRulerView in its standard configuration for a drawing view,  
but as far as I know these probably wouldn't be all that suitable for  
deploying within a drawing or in a way different from their intended  
use. However you might want to set up a grid/ruler combo that makes  
sense with respect to your timeline though of course this would apply  
over the entire area of the drawing, which might not be applicable in  
your case (not sure).

cheers, Graham



On 5 Jun 2008, at 7:44 am, James Maxwell wrote:

> Thanks, Uli.
>
> Well, yes, t is basically a ruler, but looking into NSRulerView, it  
> seems like it might be a bit complicated to do what I'm planning on  
> doing. I want multiple horizontal rulers in my new, and I'm going to  
> be creating these dynamically, as well - basically, whenever a new  
> guide is added, a new "ruler" will be added, starting again from  
> zero (well, one actually). I'll dig around to see if Graham used  
> something other than the NSRulerView (i.e.,  a subclass), but I  
> think it will behave in basically the same way. The other thing is  
> that I'm going to allow the user to change the division on each  
> ruler, independently of the others (it's a musical time thing). I  
> kind of feel like NSRulerViews will become cumbersome doing this  
> kind of thing... But I'll look more thoroughly into NSRulerView, or  
> whatever Graham is using, before I rule it out (pun honestly not  
> intended!).
>
> cheers,
>
> J.
>
>
> On 4-Jun-08, at 12:03 PM, Uli Kusterer wrote:
>
>> Am 04.06.2008 um 18:52 schrieb James Maxwell:
>>> I'm just wondering if anyone knows how to create an object that  
>>> can't be deleted?
>>> I have a timeline-like object at the top of my window which I  
>>> build during my -awakeFromNib, and I don't want it to be possible  
>>> to delete it, or to undo its creation. And actually, while I'm on  
>>> the topic, I also don't want it to invoke drag and drop...  
>>> Basically, I'm trying to create an object which really can't be  
>>> edited, in any way, but I do need to detect mouseDowns on its  
>>> surface (I'm using it to create DKGuides).
>>
>>
>> It sounds like you're trying to do a ruler view. I think DrawKit  
>> does rulers, so I'd be surprised if that wasn't what Graham is  
>> using. Can't you just subclass whatever ruler Graham uses and add  
>> your stuff? Or, come to think of it, I think you can actually have  
>> several rulers on a view, so you could probably create your own  
>> based on Graham's code.
>>
>> Cheers,
>> -- Uli Kusterer
>> "The Witnesses of TeachText are everywhere..."
>> http://www.zathras.de
>>
>>
>>
>>
>>
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