/*

    File:       OpenURLPanel.m

    Originally introduced at WWDC 2004 at

              Session 214, "Programming QuickTime with Cocoa." 

              Sample code is explained in detail in 

              "QTKit Programming Guide" documentation.

    Copyright:   © Copyright 2004, 2005 Apple Computer, Inc.

                 All rights reserved.

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

    Apple Computer, 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 AppleÕs 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 Computer,

    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

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*/

#import "OpenURLPanel.h"

    // user defaults keys

#define kUserDefaultURLsKey @"UserDefaultURLsKey"

    // maximum urls

#define kMaximumURLs        15

@implementation OpenURLPanel

static OpenURLPanel *openURLPanel = nil;

    // class methods

+ (id)openURLPanel

{

    if (openURLPanel == nil)

        openURLPanel = [[self alloc] init];

    return openURLPanel;

}

- (id)init

{

    [super init];

    // init

    [self setURLArray:[NSMutableArray arrayWithCapacity:10]];

    // listen for app termination notifications

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(writeURLs:) name:NSApplicationWillTerminateNotification object:NSApp];

    return self;

}

- (void)dealloc

{

    [[NSNotificationCenter defaultCenter] removeObserver:self];

    [self setURLArray:nil];

    [super dealloc];

}

    // getters

- (NSString *)urlString

{

    NSString *urlString = nil;

    // get the url

    urlString = [mUrlComboBox stringValue];

    if (urlString == nil)

        urlString = [mUrlComboBox objectValueOfSelectedItem];

    if ([urlString length] == 0)

        urlString = nil;

    return urlString;

}

- (NSURL *)url

{

    NSURL       *url = nil;

    NSString    *urlString;

    // get the url

    urlString = [self urlString];

    if (urlString)

        url = [NSURL URLWithString:urlString];

    return url;

}

    // setters

- (void)setURLArray:(NSMutableArray *)urlLArray

{

    [urlLArray retain];

    [mUrlArray retain];

    mUrlArray = urlLArray;

}

    // delegates

- (void)awakeFromNib

{

    NSArray *urls;

    // restore the previous urls

    urls = [[NSUserDefaults standardUserDefaults] objectForKey:kUserDefaultURLsKey];

    [mUrlArray addObjectsFromArray:urls];

    if (urls)

        [mUrlComboBox addItemsWithObjectValues:urls];

}

    // notifications

- (void)writeURLs:(NSNotification *)notification

{

    NSUserDefaults *userDefaults;

    if ([mUrlArray count])

    {

        // init

        userDefaults = [NSUserDefaults standardUserDefaults];

        // write out the urls

        [userDefaults setObject:mUrlArray forKey:kUserDefaultURLsKey];

        [userDefaults synchronize];

    }

}

    // actions

- (IBAction)doOpenURL:(id)sender

{

    NSString    *urlString;

    NSURL       *url;

    BOOL        informDelegate = YES;

    IMP         callback;

    if ([sender tag] == NSOKButton)

    {

        // validate the URL

        url = [self url];

        urlString = [self urlString];

        if (url)

        {

            // save the url

            if (![mUrlArray containsObject:urlString])

            {

                // save the url

                [mUrlArray addObject:urlString];

                // add the url to the combo box

                [mUrlComboBox addItemWithObjectValue:urlString];

                // remove the oldest url if the maximum has been exceeded

                if ([mUrlArray count] > kMaximumURLs)

                {

                    [mUrlArray removeObjectAtIndex:0];

                    [mUrlComboBox removeItemAtIndex:0];

                }

            }

            else

            {

                // move the url to the bottom of the list

                [mUrlArray removeObject:urlString];

                [mUrlArray addObject:urlString];

                [mUrlComboBox removeItemWithObjectValue:urlString];

                [mUrlComboBox addItemWithObjectValue:urlString];

            }

        }

        else

        {

            if (mIsSheet)

                NSRunAlertPanel(@"Invalid URL", @"The URL is not valid.", nil, nil, nil);

            else

                NSBeginAlertSheet(@"Invalid URL", nil, nil, nil, mPanel, nil, nil, nil, nil, @"The URL is not valid.");

            informDelegate = NO;

        }

    }

    // inform the delegate

    if (informDelegate && mDelegate && mDidEndSelector)

    {

        callback = [mDelegate methodForSelector:mDidEndSelector];

        callback(mDelegate, mDidEndSelector, self, [sender tag], mContextInfo);

    }

}

    // methods

- (void)beginSheetWithWindow:(NSWindow *)window delegate:(id)delegate didEndSelector:(SEL)didEndSelector contextInfo:(void *)contextInfo

{

    // will this run as a sheet

    mIsSheet = (window ? YES : NO);

    // save the delegate, did end selector, and context info

    mDelegate = delegate;

    mDidEndSelector = (didEndSelector);

    mContextInfo = contextInfo;

    // load the bundle (if necessary)

    if (mPanel == nil)

        [NSBundle loadNibNamed:@"OpenURLPanel" owner:self];

    // start the sheet (or window)

    [NSApp beginSheet:mPanel modalForWindow:window modalDelegate:nil didEndSelector:nil contextInfo:nil];

}

- (void)close

{

    // close it down

    [NSApp endSheet:mPanel];

    [mPanel close];

}

@end