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November 29, 2009 15:18
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# http://www.bencurtis.com/wp-content/uploads/2008/05/snapper.rb | |
#!/usr/bin/env ruby | |
# Thanks to the heavy lifting done by others: | |
# http://pastie.caboo.se/69235 | |
# http://pastie.caboo.se/68511 | |
require 'osx/cocoa' | |
OSX.require_framework 'WebKit' | |
class Snapper < OSX::NSObject | |
def init | |
# This sets up some context that we need for creating windows. | |
OSX::NSApplication.sharedApplication | |
# Create an offscreen window into which we can stick our WebView. | |
@window = OSX::NSWindow.alloc.initWithContentRect_styleMask_backing_defer( | |
[0, 0, 800, 600], OSX::NSBorderlessWindowMask, OSX::NSBackingStoreBuffered, false | |
) | |
# Create a WebView and stick it in our offscreen window. | |
@webView = OSX::WebView.alloc.initWithFrame([0, 0, 800, 600]) | |
@window.setContentView(@webView) | |
# Use the screen stylesheet, rather than the print one. | |
@webView.setMediaStyle('screen') | |
# Make sure we don't save any of the prefs that we change. | |
@webView.preferences.setAutosaves(false) | |
# Set some useful options. | |
@webView.preferences.setShouldPrintBackgrounds(true) | |
@webView.preferences.setJavaScriptCanOpenWindowsAutomatically(false) | |
@webView.preferences.setAllowsAnimatedImages(false) | |
# Make sure we don't get a scroll bar. | |
@webView.mainFrame.frameView.setAllowsScrolling(false) | |
self | |
end | |
def fetch(url) | |
# This sets up the webView_* methods to be called when loading finishes. | |
@webView.setFrameLoadDelegate(self) | |
# Tell the webView what URL to load. | |
@webView.setValue_forKey(url, 'mainFrameURL') | |
# Pass control to Cocoa for a bit. | |
OSX.CFRunLoopRun | |
@succeeded | |
end | |
attr_reader :error | |
def webView_didFinishLoadForFrame(view, frame) | |
@succeeded = true | |
# Resize the view to fit the page. | |
@docView = @webView.mainFrame.frameView.documentView | |
@docView.window.setContentSize(@docView.bounds.size) | |
@docView.setFrame(@docView.bounds) | |
# Return control to the fetch method. | |
OSX.CFRunLoopStop(OSX.CFRunLoopGetCurrent) | |
end | |
def webView_didFailLoadWithError_forFrame(webview, error, frame) | |
@error = error | |
@succeeed = false | |
# Return control to the fetch method. | |
OSX.CFRunLoopStop(OSX.CFRunLoopGetCurrent) | |
end | |
def webView_didFailProvisionalLoadWithError_forFrame(webview, error, frame) | |
@error = error | |
@succeeed = false | |
# Return control to the fetch method. | |
OSX.CFRunLoopStop(OSX.CFRunLoopGetCurrent) | |
end | |
def save(filename, options = {}) | |
@docView.setNeedsDisplay(true) | |
@docView.displayIfNeeded | |
@docView.lockFocus | |
bitmap = OSX::NSBitmapImageRep.alloc.initWithFocusedViewRect(@docView.bounds) | |
@docView.unlockFocus | |
# Write the bitmap to a file as a PNG | |
bitmap.representationUsingType_properties(OSX::NSPNGFileType, nil).writeToFile_atomically(filename, true) | |
bitmap.release | |
end | |
end | |
# snapper = Snapper.alloc.init | |
# if snapper.fetch(ARGV[0]) | |
# snapper.save('simple.png') | |
# else | |
# print "Error: #{snapper.error}\n" | |
# end |
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