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54 lines
2.2 KiB
Plaintext
54 lines
2.2 KiB
Plaintext
Extensions in SeedDMS
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=====================
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Since verson 5.0.0 SeedDMS can be extended by extensions. Extensions
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can hook up functions into certain operations, e.g.
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uploading, removing or displaying a document. They can also be
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used to modify some of the internal variables like the list of
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translations and they can even replace classes in the core of
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seeddms and hook up functions into certain operations in the core.
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All extensions are located in the folder 'ext'. Each extension
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has its own folder named by the name of the extension. The central
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configuration of an extension is stored in conf.php.
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The configuration sets the file and classname which is loaded
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during initialization of the extension. The class has to have
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a method init() which is called with any page request. The
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configuration itself is cached and must be updated within
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the extension manager if it was changed.
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The integration into SeedDMS is done by hooks, class and file
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overloading. SeedDMS manages
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a globally available array of hooks ($GLOBALS['SEEDDMS_HOOKS']).
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This array has the elements 'view' and 'controller'. All entries
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in those array elements contain instances of self defined classes
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containing the hook methods. For setting up the hooks in the view
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'viewFolder' the following code is needed.
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$GLOBALS['SEEDDMS_HOOKS']['view']['viewFolder'][] = new SeedDMS_ExtExample_ViewFolder;
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class SeedDMS_ExtExample_ViewFolder {
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...
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};
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The same approach is implemented for hooks called from the controller
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logic (the op/op.*.php files).
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$GLOBALS['SEEDDMS_HOOKS']['controller']['removeFolder'][] = new SeedDMS_ExtExample_RemoveFolder;
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class SeedDMS_ExtExample_RemoveFolder {
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...
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};
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Based on these two variants of adding hooks to the seeddms application code,
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the seeddms core can be extended by implementing the controller hook 'initDMS'
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which is called right after the class SeedDMS_Core_DMS has been initiated.
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Beside hooks and callbacks another way of modifying seeddms is given
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by overloading the files in the directory 'views' and 'controllers'. Both
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directories contain class files with a single class for either running
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controller or view code. If an extension provides those file in its
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own extension dir, they will be used instead of the files shipped with
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seeddms.
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