[Laszlo-dev] Continued: swf9 and attribute constraint peculiarity

[Max Carlson]

That's correct.  Constraints will only work properly with OL attributes. 
  Things like array.length don't tell the runtime when they change, so 
the constraint doesn't know when to update...

Rami Ojares / AMG Oy wrote:
> It probably has something to do with the dependencies...
> Maybe my code is incorrect when it refers to "parent.someArr.length" in 
> the constraint?
> Am I allowed only to refer to attribute names of laszlo nodes in 
> constraints?
> So that dependencies can be constructed properly.
> 
> - rami
> 
> Rami Ojares / AMG Oy wrote:
>> Hi,
>>
>> I stumbled upon a problem with swf9 (and up) attribute constraints.
>>
>> Here is sample code that works in swf8 but fails silently in swf9
>>
>> <!-- The problem is with setting of bgcolor attribute -->
>> <canvas debug="true">
>>    <view name="test">
>>              <attribute name="someArr" value=" new Array()"/>
>>              <view width="100" height="100" 
>> bgcolor="${parent.someArr.length == 0 ? 'red' : 'blue'}" x="30" y="45">
>>            <handler name="oninit">
>>                Debug.inspect(parent.someArr.length == 0)
>>            </handler>
>>        </view>
>>         </view>
>> </canvas>
>>
>> Here the same thing slightly modified so that it works in swf9
>>
>> <!-- The problem is with setting of bgcolor attribute -->
>> <canvas debug="true">
>>    <view name="test">
>>              <attribute name="someArr" value=" new Array()"/>
>>              <view width="100" height="100" 
>> bgcolor="${this.hasErrors() ? 'red' : 'blue'}" x="30" y="45">
>>            <handler name="oninit">
>>                Debug.inspect(parent.someArr.length == 0)
>>            </handler>
>>            <method name="hasErrors">
>>                return parent.someArr.length == 0;
>>            </method>
>>        </view>
>>          </view>
>> </canvas>
>>
>> So it seems to me that something gets screwed parsing attribute 
>> constraints in swf9.
>> Any ideas?
>>
>> - rami
> 

-- 
Regards,
Max Carlson
OpenLaszlo.org