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Implement async load of gravatar images
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| # | ||
| # ImageLoadOperation.rb | ||
| # gitnub | ||
| # | ||
| # Created by Kevin Ballard on 3/21/08. | ||
| # Copyright (c) 2008 Kevin Ballard. All rights reserved. | ||
| # | ||
|
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| require 'osx/cocoa' | ||
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| class ImageLoadOperation < OSX::NSOperation | ||
| def initWithURL_delegate(url, delegate) | ||
| init | ||
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| @url = url | ||
| @delegate = delegate | ||
| @executing = false | ||
| @finished = false | ||
| self | ||
| end | ||
|
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| def isConcurrent | ||
| true | ||
| end | ||
|
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| def start | ||
| request = NSURLRequest.requestWithURL(@url) | ||
| @connection = NSURLConnection.connectionWithRequest_delegate(request, self) | ||
| setExecuting true | ||
| end | ||
|
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| def cancel | ||
| super | ||
| @connection.cancel | ||
| setExecuting false | ||
| end | ||
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| def isExecuting | ||
| @executing | ||
| end | ||
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| def isFinished | ||
| @finished | ||
| end | ||
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| # NSURLConnection Delegate methods | ||
| def connection_didFailWithError(connection, error) | ||
| @delegate.imageLoadForURL_didFailWithError(@url, error) | ||
| setExecuting false | ||
| setFinished true | ||
| end | ||
|
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| def connection_didReceiveResponse(connection, response) | ||
| length = response.expectedContentLength | ||
| @data = NSMutableData.dataWithCapacity(length < 0 ? 0 : length) | ||
| end | ||
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| def connection_didReceiveData(connection, data) | ||
| @data.appendData(data) | ||
| end | ||
|
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| def connectionDidFinishLoading(connection) | ||
| image = NSImage.alloc.initWithData(@data) | ||
| if image | ||
| @delegate.imageLoadForURL_didFinishLoading(@url, image) | ||
| else | ||
| error = NSError.errorWithDomain_code_userInfo_( | ||
| "GitNub", 0, {NSLocalizedDescriptionKey => "Could not recognize image data"} | ||
| ) | ||
| @delegate.imageLoadForURL_didFailWithError(@url, error) | ||
| end | ||
| end | ||
|
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| private | ||
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| def setExecuting(bool) | ||
| self.willChangeValueForKey("isExecuting") | ||
| @executing = bool | ||
| self.didChangeValueForKey("isExecuting") | ||
| end | ||
|
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||
| def setFinished(bool) | ||
| self.willChangeValueForKey("isFinished") | ||
| @finished = bool | ||
| self.didChangeValueForKey("isFinished") | ||
| end | ||
| end |