Hi Dalmazio,
see my comments below.
Dalmazio Brisinda wrote:
> However, on your second point -- this is part of the problem I'm having. The
> width and height attributes are not actually being used in the Gallery
> Widget. Looking more closely at the source for the Gallery widget we have
> the following in createImageCell():
>
> inode.width = d.thumbWidth + 2;
> inode.height = d.thumbHeight + 2;
>
> It looks as if the width and height properties (assigned to d.width and
> d.height) are entirely unused in the Gallery widget. That the img element
> width height properties are being assigned the value of the thumbWidth and
> thumbHeight properties. I'm thinking that this might have been
> unintentional, but I'm not sure. But I can deal with this by subclassing and
> changing the functionality.
Yes you are right, these values are not used by the gallery widget.
However, if you subclass the gallery widget you can use them and as the
data structure is a map you can also easily add additional fields
without breaking the existing
functionality.
> But even more importantly, even if I subclass the Gallery widget to actually
> use the supplied width and height properties, where do I get the *actual*
> width and height of the image just loaded, so I can pass correct width and
> height info to the Gallery widget? This information doesn't seem to be
> readily available anywhere. It almost seems like I need to load the image
> first (perhaps in an invisible iframe?) then get the x and y dimensions,
> then load the image again in the visible gallery with the now known x and y
> dimensions. Not sure about this though. Any thoughts on this?
You can use the preloader manager of qooxdoo to achieve this.
--snip--
var preloader =
qx.io.image.PreloaderManager.getInstance().create("http://YOUR-IMAGE-URL";);
preloader.addEventListener("load", function(e){
// "this" refers to the preloader object
// -> http://demo.qooxdoo.org/current/apiviewer/#qx.io.image.Preloader
var height = this.getHeight();
var width = this.getWidth();
});
--snip--
This way qooxdoo is preloading the image and you can get the width and
height infos from the preloader and add then the right values to the
gallery.
Hope this helps,
Ale
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