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adium / Source / AIAutoScrollTextView.m

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/* 
 * Adium is the legal property of its developers, whose names are listed in the copyright file included
 * with this source distribution.
 * 
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU
 * General Public License as published by the Free Software Foundation; either version 2 of the License,
 * or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
 * Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along with this program; if not,
 * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#import "AIAutoScrollTextView.h"

#define ABOUT_SCROLL_FPS        30.0
#define ABOUT_SCROLL_RATE       1.0

@interface AIAutoScrollTextView (Private)
- (void)startScrolling;
- (void)stopScrolling;
@end

@implementation AIAutoScrollTextView

- (void)loadText:(NSAttributedString *)textToLoad
{
        [[self textStorage] setAttributedString:textToLoad];
        [self startScrolling];
}

- (void)dealloc
{
        [scrollTimer invalidate]; [scrollTimer release]; scrollTimer = nil;
        [eventLoopScrollTimer invalidate]; [eventLoopScrollTimer release]; eventLoopScrollTimer = nil;
        [super dealloc];
}

//When the user scrolls stop the automatic scrolling
- (void)scrollWheel:(NSEvent *)theEvent
{
        if (scrollTimer)
                [self stopScrolling];

        [super scrollWheel:theEvent];
}

- (void)toggleScrolling
{
        if (scrollTimer)
                [self stopScrolling];
        else
                [self startScrolling];
}

- (void)startScrolling
{
        [[self enclosingScrollView] setLineScroll:0.0];
        [[self enclosingScrollView] setPageScroll:0.0];
        [[self enclosingScrollView] setVerticalScroller:nil];
        [[self enclosingScrollView] setHasVerticalScroller:NO];
        
        //Start scrolling
        scrollLocation = [[[self enclosingScrollView] contentView] bounds].origin.y;
        maxScroll = [[self textStorage] size].height - [[self enclosingScrollView] documentVisibleRect].size.height;
        scrollTimer = [[NSTimer scheduledTimerWithTimeInterval:(1.0/ABOUT_SCROLL_FPS)
                                                                                                        target:self
                                                                                                  selector:@selector(scrollTimer:)
                                                                                                  userInfo:nil
                                                                                                   repeats:YES] retain];
        eventLoopScrollTimer = [[NSTimer timerWithTimeInterval:(1.0/ABOUT_SCROLL_FPS)
                                                                                                        target:self
                                                                                                  selector:@selector(scrollTimer:)
                                                                                                  userInfo:nil
                                                                                                   repeats:YES] retain];
        [[NSRunLoop currentRunLoop] addTimer:eventLoopScrollTimer forMode:NSEventTrackingRunLoopMode];
}

- (void)stopScrolling
{
        [scrollTimer invalidate]; [scrollTimer release]; scrollTimer = nil;
        [eventLoopScrollTimer invalidate]; [eventLoopScrollTimer release]; eventLoopScrollTimer = nil;

        //Enable scrolling and show the scrollbar
        [[self enclosingScrollView] setLineScroll:10.0];
        [[self enclosingScrollView] setPageScroll:10.0];
        [[self enclosingScrollView] setVerticalScroller:[[[NSScroller alloc] init] autorelease]];
        [[self enclosingScrollView] setHasVerticalScroller:YES];
}

//Scroll the credits
- (void)scrollTimer:(NSTimer *)scrollTimer
{
        scrollLocation += ABOUT_SCROLL_RATE;
        
        if (scrollLocation > maxScroll) scrollLocation = 0;
        if (scrollLocation < 0) scrollLocation = maxScroll;
        
        [self scrollPoint:NSMakePoint(0, scrollLocation)];
}

@end