/*

 File: GeneratePreviewForURL.m

 Abstract: This is the code to generate Quick Look previews for Sketch documents

 Version: 1.1

 Disclaimer: IMPORTANT:  This Apple software is supplied to you by 

 Apple Inc. ("Apple") in consideration of your agreement to the

 following terms, and your use, installation, modification or

 redistribution of this Apple software constitutes acceptance of these

 terms.  If you do not agree with these terms, please do not use,

 install, modify or redistribute this Apple software.

 In consideration of your agreement to abide by the following terms, and

 subject to these terms, Apple grants you a personal, non-exclusive

 license, under Apple's copyrights in this original Apple software (the

 "Apple Software"), to use, reproduce, modify and redistribute the Apple

 Software, with or without modifications, in source and/or binary forms;

 provided that if you redistribute the Apple Software in its entirety and

 without modifications, you must retain this notice and the following

 text and disclaimers in all such redistributions of the Apple Software. 

 Neither the name, trademarks, service marks or logos of Apple Inc. 

 may be used to endorse or promote products derived from the Apple

 Software without specific prior written permission from Apple.  Except

 as expressly stated in this notice, no other rights or licenses, express

 or implied, are granted by Apple herein, including but not limited to

 any patent rights that may be infringed by your derivative works or by

 other works in which the Apple Software may be incorporated.

 The Apple Software is provided by Apple on an "AS IS" basis.  APPLE

 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

 THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS

 FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND

 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL

 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,

 MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED

 AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),

 STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE

 POSSIBILITY OF SUCH DAMAGE.

 Copyright (C) 2009 Apple Inc. All Rights Reserved. 

 */

#include <CoreFoundation/CoreFoundation.h>

#include <CoreServices/CoreServices.h>

#include <QuickLook/QuickLook.h>

#import "SKTDrawDocument.h"

/* -----------------------------------------------------------------------------

 Generate a preview for file

 This function's job is to create preview for designated file

 ----------------------------------------------------------------------------- */

OSStatus GeneratePreviewForURL(void *thisInterface, QLPreviewRequestRef preview, CFURLRef url, CFStringRef contentTypeUTI, CFDictionaryRef options)

{

    NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];

    // Create and read the document file

    SKTDrawDocument* document = [[SKTDrawDocument alloc] init];

    if(![document readFromURL:(NSURL *)url ofType:(NSString *)contentTypeUTI]) {

        [document release];

        [pool release];

        return noErr;

    }

    NSSize canvasSize = [document canvasSize];

    // Preview will be drawn in a vectorized context

    // Here we create a graphics context to draw the Quick Look Preview in

    CGContextRef cgContext = QLPreviewRequestCreateContext(preview, *(CGSize *)&canvasSize, false, NULL);

    if(cgContext) {

        NSGraphicsContext* context = [NSGraphicsContext graphicsContextWithGraphicsPort:(void *)cgContext flipped:YES];

        if(context) {

            //These two lines of code are just good safe programming...

            [NSGraphicsContext saveGraphicsState];

            [NSGraphicsContext setCurrentContext:context];

            [document drawDocumentInContext:context];

            //This line sets the context back to what it was when we're done

            [NSGraphicsContext restoreGraphicsState];

        }

        // When we are done with our drawing code QLPreviewRequestFlushContext() is called to flush the context

        QLPreviewRequestFlushContext(preview, cgContext);

        CFRelease(cgContext);

    }

    [pool release];

    return noErr;

}

void CancelPreviewGeneration(void* thisInterface, QLPreviewRequestRef preview)

{

    // implement only if supported

}