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Can I add functions to Image class using DataObjectDecorator?
8 October 2010 at 1:37pm
Hello,
I've previously extended Image using this method http://doc.silverstripe.org/recipes:customising_image but it seems to cause headaches - I think because it changes the class in the File table from 'Image' to 'Page_Image'. I end up with broken/missing images if images are used in different ways throughout the site - i.e. used as a standard 'Image' in page content and a 'Page_Image' elsewhere.
I would like to keep all the images using the standard 'Image' class but allow some custom resizing functions to be called on any image - so in the template something like '$Image.ZoomedImage' which returns my image with custom gd functions applied.
Is this possible perhaps using a DataObjectDecorator? I played around with it but I just can't work it out - if anyone can help me out I'd be really grateful!
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Re: Can I add functions to Image class using DataObjectDecorator?
8 October 2010 at 2:52pm
Hi JonoM,
yes you can add function by a decorator.
you need to do a few things...
in _config.php:
DataObject::add_extension('Image', 'MyImage');
then create the decorator:
<?php
class MyImage extends DataObjectDecorator {
function extraStatics() {
return array(
'db' => array(),
'has_one' => array()
);
}
function MyImageFunc(){
// do something here ...
}
}then you can call the functions in the decorator
hope it helps
cheers
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Re: Can I add functions to Image class using DataObjectDecorator?
8 October 2010 at 5:53pm
Thanks Carlos,
That's basically what I tried - so here's what I have in CustomImage.php:
class CustomImage extends DataObjectDecorator {
function generateZoomedImage($gd) {
$gd->setQuality(90);
$height = $gd->getHeight();
$width = $gd->getWidth();
if ($height > 600 || $width > 600) return $gd->resizeRatio(600,600);
else return $gd;
}
}But if I then call say $Photo.ZoomedImage in a template where $Photo is an image object I don't get any output... any ideas?
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Re: Can I add functions to Image class using DataObjectDecorator?
26 January 2011 at 5:12am
Hi JonoM,
you unfortunately need two functions Foo() and generateFoo() inside the decorator, because the base class doesn't seem to be aware of the decorated functions:
function generateWebsiteThumbnail($gd) {
$gd->setQuality(85);
return $gd->resizeRatio(150,150);
}function WebsiteThumbnail() {
return $this->owner->getFormattedImage('WebsiteThumbnail');
}I guess it's a bug but for now this hack should do.
As you can see in sapphire/core/Object.php the function getAllMethodNames() has a parameter $custom which is default set to false. So image class isn't aware of the decorated functions. You could try to set getAllMethodNames(true) in sapphire/model/Image.php (untested), this would do the trick with only one function.
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