View source for Internet Plug-Ins

'''Internet Plug-Ins''' is a directory in <tt>/System/Library/</tt> and <tt>/Library/</tt> that contains plug-ins for WebKit. As of iOS 6 and 7, the only default plugin there is QuickTime.

== Structure of an Internet Plug-In ==
Internet plug-ins should have an extension of <tt>.webplugin</tt>. The principal class should be a subclass of [[UIView]] and adopts the [http://developer.apple.com/library/mac/documentation/Cocoa/Reference/WebKit/Protocols/WebPlugInViewFactory_Protocol/Reference/Reference.html#//apple_ref/doc/uid/TP40003833 WebPlugInViewFactory] and [http://developer.apple.com/mac/library/documentation/Cocoa/Reference/WebKit/Protocols/WebPlugIn_Protocol/Reference/Reference.html WebPlugIn] protocols:
<source lang="objc">
@protocol WebPlugInViewFactory <NSObject>
-(UIView*)plugInViewWithArguments:(NSDictionary*)args;
@end

@protocol WebPlugIn
@optional
-(void)webPlugInInitialize;
-(void)webPlugInDestroy;
-(void)webPlugInStop;
-(void)webPlugInStart;

-(id)objectForWebScript;

-(void)webPlugInMainResourceDidFailWithError:(NSError*)error;
-(void)webPlugInMainResourceDidFinishLoading;
-(void)webPlugInMainResourceDidReceiveData:(NSData*)data;
-(void)webPlugInMainResourceDidReceiveResponse:(NSURLResponse*)response;

// UIKit extras
-(BOOL)webPlugInReceivesEventsDirectly;   // inform UIKit that this plug-in should handle the events directly.
-(void)webPlugInLayout;   // similar to UIView's -layoutSubview
-(void)webPlugInDidDraw;  // similar to UIView's -drawRect:
@end
</source>

The <tt>Info.plist</tt> should contain some keys starting with <tt>WebPlugin…</tt>. See [http://developer.apple.com/legacy/library/documentation/InternetWeb/Conceptual/WebKit_PluginProgTopic/WebKitPluginTopics] for detail.

== References ==
* [http://developer.apple.com/legacy/library/documentation/InternetWeb/Conceptual/WebKit_PluginProgTopic/WebKitPluginTopics Introduction to WebKit Plug-in Programming Topics] (on Mac OS X; should be similar on iOS though).

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[[Category:Directories in /System/Library]]