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90 lines
2.9 KiB
90 lines
2.9 KiB
/*****************************************************************************
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* VLCScrollingClipView.m: NSClipView subclass that automatically scrolls
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*****************************************************************************
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* Copyright (C) 2015 VLC authors and VideoLAN
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* $Id$
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*
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* Author: Marvin Scholz <epirat07@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#import "VLCScrollingClipView.h"
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@implementation VLCScrollingClipView {
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NSTimer *scrollTimer;
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NSTimeInterval startInterval;
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}
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- (void)startScrolling {
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// Start our timer unless running
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if (!scrollTimer) {
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scrollTimer = [NSTimer scheduledTimerWithTimeInterval: 1/6
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target:self
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selector:@selector(scrollTick:)
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userInfo:nil
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repeats:YES];
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}
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}
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- (void)stopScrolling {
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// Stop timer unless stopped
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if (scrollTimer) {
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[scrollTimer invalidate];
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scrollTimer = nil;
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}
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}
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- (void)resetScrolling {
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startInterval = 0;
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[self scrollToPoint:NSMakePoint(0.0, 0.0)];
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if (_parentScrollView) {
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[_parentScrollView reflectScrolledClipView:self];
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}
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}
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- (void)scrollWheel:(NSEvent *)theEvent {
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// Stop auto-scrolling if the user scrolls
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[self stopScrolling];
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[super scrollWheel:theEvent];
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}
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- (void)scrollTick:(NSTimer *)timer {
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CGFloat maxHeight = self.documentRect.size.height;
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CGFloat scrollPosition = self.documentVisibleRect.origin.y;
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// Delay start
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if (scrollPosition == 0.0 && !startInterval) {
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startInterval = [NSDate timeIntervalSinceReferenceDate] + 2.0;
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}
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if ([NSDate timeIntervalSinceReferenceDate] >= startInterval) {
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// Reset if we are past the end
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if (scrollPosition > maxHeight) {
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[self resetScrolling];
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return;
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}
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// Scroll the view a bit on each tick
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[self scrollToPoint:NSMakePoint(0.0, scrollPosition + 0.5)];
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// Update the parent ScrollView
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if (_parentScrollView) {
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[_parentScrollView reflectScrolledClipView:self];
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}
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}
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}
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@end
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