> Norbert,
>
> While what Nick proposes is a nice workaround, I think it would be
> useful to let the command decide on the cancel continuation. However
> the logic for that should go into the Model, not the View. Also we
> have to pay attention not to use #ifNil:ifNotNil: and friends, because
> that doesn't work across all supported platforms. Norbert, can you
> provide a change?
>
> Lukas
>
> On 22 October 2010 19:01, Nick Ager <[hidden email]> wrote:
>> Hi Norbert,
>> I think I might have solved a similar problem in a different way.  I created
>> a "clean" environment specifically for non-view commands.
>> Then I derived from PRPierFrame and implemented:
>> environment
>> ^ self context command useEditingEnvironment ifTrue: [
>> self kernel editingEnvironment
>> ] ifFalse: [
>> self context structure environment
>> ]
>> Then:
>> PRCommand>>useEditingEnvironment
>> ^ (self isView or: [self isQuick]) not
>>
>> ---
>> Other ways round would be to create your own PRContents widget or return a
>> command with the structure you want to display, instead of returning nil
>> ---
>> I only mention the above work-arounds as I don't have enough knowledge to
>> say for certain that your changes wouldn't cause unintended side-effects..
>>
>> Hope this helps
>> Nick
>>
>>
>>
>>
>> On 22 October 2010 12:57, Norbert Hartl <[hidden email]> wrote:
>>>
>>> I like to execute a command in a way that the structure is changed while
>>> the command is being executed. If the command is commited I like to advance
>>> the structure to another structure. If the command is aborted than I like to
>>> return to the structure from where the command has been invoked.
>>>
>>> Basically I do something like this
>>>
>>>        html anchor
>>>                goto: (self context
>>>                                structure: self
>>> structureWhileCommandIsExecuting
>>>                                command: MyPierCommand new);
>>>                with: 'do it' ]
>>>
>>> In MyPierCommand>>doExecute I do at the end
>>>
>>> self answer: (self context structure: self
>>> structureAfterCommandHasBeingCommited )
>>>
>>> This way I have chose a structure for command execution and the structure
>>> if the command is commited. But on abort it stays where it has been executed
>>> (structureWhileCommandIsExecuting). Looking at
>>>
>>> PRContentsWidget>>onAnswerCommand: aCommand
>>>        aCommand isNil
>>>                ifTrue: [ ^ self context: (self context structure: self
>>> context structure) ].
>>>        [ aCommand execute ]
>>>                on: MAError
>>>                do: [ :err | ^ self component errors add: err ].
>>>        self context: aCommand answer
>>>
>>> we see that if aCommand isNil (abort) the structure is nailed to the
>>> current one (while executing). Would it be ok to change that so it is
>>> answering every time? I simple change would be to change
>>>
>>> buildComponent: aContext
>>>        ^ aContext command asComponent
>>>                onAnswer: [ :value | self onAnswerCommand: value ];
>>>                yourself
>>>
>>> to
>>>
>>> buildComponent: aContext
>>>        ^ aContext command asComponent
>>>                onAnswer: [ :value | value ifNotNil: [ self
>>> onAnswerCommand: value ] ifNil: [ aContext command doAnswer ] ];
>>>                yourself
>>>
>>> this way
>>>
>>> PRCommand>>doAnswer
>>>        self answer ifNil: [ self answer: (self context structure: self
>>> structure) ]
>>>
>>> would the same but some could overwrite the answer when creating the link
>>>
>>> what do you think?
>>>
>>> Norbert
>>> _______________________________________________
>>> Magritte, Pier and Related Tools ...
>>> https://www.iam.unibe.ch/mailman/listinfo/smallwiki
>>
>>
>> _______________________________________________
>> Magritte, Pier and Related Tools ...
>> https://www.iam.unibe.ch/mailman/listinfo/smallwiki
>>
>
>
>
> --
> Lukas Renggli
> www.lukas-renggli.ch
>