Hi Lars,
This might not be the best way, but off the top of my head you could use
a semaphore and explicitly call setX setY from your pixel property...
Something like this: (untested)
====================================================================
properties :
{
x :
{
apply : "_applyX",
init : null
},
y :
{
apply : "_applyY",
init : null
},
pixel :
{
check : "Array"
apply : "_applyGroup",
init : null
}
},
members :
{
__action : null,
_applyX : function(value)
{
if (this.__action == null)
{
this.__action = "applyY";
// manually update the group property
this.setPixel([value, this.getY()]);
this._drawPixel();
this.__action = null;
}
},
_applyY : function(value)
{
if (this.__action == null)
{
this.__action = "applyY";
// manually update the group property
this.setPixel([this.getX(), value]);
this._drawPixel();
this.__action = null;
}
},
_applyGroup : function(value)
{
if (this.__action == null)
{
this.__action = "applyGroup";
this.setX(value[0]);
this.setY(value[0]);
this._drawPixel();
this.__action = null;
}
}
}
====================================================================
As I said, it's untested so there might be some bugs/typos but hopefully
that should give you somethign to work with.
Matt
Lars Martin wrote:
> Hi,
>
> I newly subscribed the list because I'm currently developing a RAP
> custom widget and I do have some problems with the JavaScript
> counterpart of my Java implementation. This question is regarding
> qooxdoos property system. I'm sure I missed some important points.
>
> My RAP widget passes an int[] named "pixel" to qooxdoo and the property
> system automatically call "setX" and "setY" to set the members from
> incoming int[] as below:
>
> properties : {
>
> x : {
> apply : "_drawPixel",
> init : null
> },
>
> y : {
> apply : "_drawPixel",
> init : null
> },
>
> pixel : {
> check : "Array",
> group : [ "x", "y" ]
> }
> },
>
> members : {
> _drawPixel : function(value, old) {
> // draw a pixel at [x,y]
> },
> ...
> }
>
> My question is: how can I ensure a single or atomic setter for grouped
> properties? If I want to draw a point at [x,y] how can I ensure that the
> _drawPixel method is called only once. Better said: is called only when
> property x AND y is initialized? Is there something like?
>
> pixel : {
> check : "Array",
> group : [ "x", "y" ],
> apply : "_drawPixel"
> }
>
> Any help is appreciated. Kindest regards, Lars
>
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