From cba836c2c792f3589c124257f92b941189e062f9 Mon Sep 17 00:00:00 2001
From: Andrew Short <andrewjshort@gmail.com>
Date: Sun, 6 Dec 2009 20:47:05 +1100
Subject: [PATCH] FEATURE: Added VersionedImageExtension to automatically
regenerate cached/resampled images when a file version is changed.
---
_config.php | 3 +-
code/VersionedImageExtension.php | 70 ++++++++++++++++++++++++++++++++
2 files changed, 72 insertions(+), 1 deletion(-)
create mode 100755 code/VersionedImageExtension.php
diff --git a/_config.php b/_config.php
index c010ef6..00585df 100755
--- a/_config.php
+++ b/_config.php
@@ -3,4 +3,5 @@
* @package silverstripe-versionedfiles
*/
-Object::add_extension('File', 'VersionedFileExtension');
\ No newline at end of file
+Object::add_extension('File', 'VersionedFileExtension');
+Object::add_extension('Image', 'VersionedImageExtension');
\ No newline at end of file
diff --git a/code/VersionedImageExtension.php b/code/VersionedImageExtension.php
new file mode 100755
index 0000000..c6fd412
--- /dev/null
+++ b/code/VersionedImageExtension.php
@@ -0,0 +1,70 @@
+<?php
+/**
+ * An extension to automatically regenerate all cached/resampled images when an image version is changed.
+ *
+ * @package silverstripe-versionedfiles
+ */
+class VersionedImageExtension extends DataObjectDecorator {
+
+ /**
+ * Regenerates all cached images if the version number has been changed.
+ */
+ public function onBeforeWrite() {
+ if(!$this->owner->isChanged('CurrentVersionID')) return;
+
+ $base = $this->owner->ParentID ? $this->owner->Parent()->getFullPath() : ASSETS_PATH . '/';
+ $resampled = "{$base}_resampled";
+
+ if(!is_dir($resampled)) return;
+
+ $files = scandir($resampled);
+ $iterator = new ArrayIterator($files);
+ $filter = new RegexIterator (
+ $iterator,
+ sprintf("/(?<method>[a-zA-Z]+)(?<arguments>[0-9]*)-%s/", preg_quote($this->owner->Name)),
+ RegexIterator::GET_MATCH
+ );
+
+ // grab each resampled image and regenerate it
+ foreach($filter as $cachedImage) {
+ $path = "$resampled/{$cachedImage[0]}";
+ $size = getimagesize($path);
+ $method = $cachedImage['method'];
+ $arguments = $cachedImage['arguments'];
+
+ unlink($path);
+
+ // Determine the arguments used to generate an image, and regenerate it. Different methods need different
+ // ways of determining the original arguments used.
+ switch(strtolower($method)) {
+ case 'resizedimage':
+ case 'setsize':
+ case 'paddedimage':
+ case 'croppedimage':
+ $this->owner->$method($size[0], $size[1]);
+ break;
+
+ case 'setwidth':
+ $this->owner->$method($size[0]);
+ break;
+
+ case 'setheight':
+ $this->owner->$method($size[1]);
+ break;
+
+ case 'setratiosize':
+ if(strpos($arguments, $size[0]) === 0) {
+ $this->owner->$method($size[0], substr($arguments, strlen($size[0])));
+ } else {
+ $this->owner->$method($size[1], substr($arguments, 0, strlen($size[0]) * -1));
+ }
+ break;
+
+ default:
+ $this->owner->$method($arguments);
+ break;
+ }
+ }
+ }
+
+}
\ No newline at end of file
--
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