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/*
* Copyright (C) 2004 Stefan Kleine Stegemann
*
* 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 "NSView+Scrolling.h"
@implementation NSView (Scrolling)
- (void) scrollToTop
{
if (![self enclosingScrollView])
{
return;
}
NSRect visibleRect = [[self enclosingScrollView] documentVisibleRect];
[self scrollPoint: NSMakePoint(NSMinX(visibleRect), NSHeight([self frame]))];
}
- (void) scrollToBottom
{
if (![self enclosingScrollView])
{
return;
}
NSRect visibleRect = [[self enclosingScrollView] documentVisibleRect];
[self scrollPoint: NSMakePoint(NSMinX(visibleRect), 0)];
}
- (BOOL) scrollPageUp
{
if (![self enclosingScrollView])
{
return NO;
}
return [self scrollUp: [[self enclosingScrollView] verticalPageScroll]];
}
- (BOOL) scrollPageDown
{
if (![self enclosingScrollView])
{
return NO;
}
return [self scrollDown: [[self enclosingScrollView] verticalPageScroll]];
}
- (BOOL) scrollLineUp
{
if (![self enclosingScrollView])
{
return NO;
}
return [self scrollUp: [[self enclosingScrollView] verticalLineScroll]];
}
- (BOOL) scrollLineDown
{
if (![self enclosingScrollView])
{
return NO;
}
return [self scrollDown: [[self enclosingScrollView] verticalLineScroll]];
}
- (BOOL) scrollUp: (float)amount
{
if (![self enclosingScrollView])
{
return NO;
}
NSAssert(amount > 0, @"negative amount");
NSRect visibleRect = [[self enclosingScrollView] documentVisibleRect];
NSPoint targetPoint = NSMakePoint(NSMinX(visibleRect),
NSMinY(visibleRect) + amount);
float maxY = NSHeight([self frame]) - NSHeight(visibleRect);
if (targetPoint.y > maxY)
{
targetPoint.y = maxY;
}
[self scrollPoint: targetPoint];
return !NSEqualRects(visibleRect, [[self enclosingScrollView] documentVisibleRect]);
}
- (BOOL) scrollDown: (float)amount
{
if (![self enclosingScrollView])
{
return NO;
}
NSAssert(amount > 0, @"negative amount");
NSRect visibleRect = [[self enclosingScrollView] documentVisibleRect];
NSPoint targetPoint = NSMakePoint(NSMinX(visibleRect),
NSMinY(visibleRect) - amount);
if (targetPoint.y < 0)
{
targetPoint.y = 0;
}
[self scrollPoint: targetPoint];
return !NSEqualRects(visibleRect, [[self enclosingScrollView] documentVisibleRect]);
}
- (void) scrollToLeftEdge
{
if (![self enclosingScrollView])
{
return;
}
NSRect visibleRect = [[self enclosingScrollView] documentVisibleRect];
NSPoint targetPoint = NSMakePoint(0, NSMinY(visibleRect));
[self scrollPoint: targetPoint];
}
- (void) scrollToRightEdge
{
if (![self enclosingScrollView])
{
return;
}
NSRect visibleRect = [[self enclosingScrollView] documentVisibleRect];
NSPoint targetPoint = NSMakePoint(NSWidth([self frame]) - NSWidth(visibleRect),
NSMinY(visibleRect));
[self scrollPoint: targetPoint];
}
- (BOOL) scrollLineLeft
{
if (![self enclosingScrollView])
{
return NO;
}
return [self scrollLeft: [[self enclosingScrollView] horizontalLineScroll]];
}
- (BOOL) scrollLineRight
{
if (![self enclosingScrollView])
{
return NO;
}
return [self scrollRight: [[self enclosingScrollView] horizontalLineScroll]];
}
- (BOOL) scrollLeft: (float)amount
{
if (![self enclosingScrollView])
{
return NO;
}
NSAssert(amount > 0, @"negative amount");
NSRect visibleRect = [[self enclosingScrollView] documentVisibleRect];
NSPoint targetPoint = NSMakePoint(NSMinX(visibleRect) - amount,
NSMinY(visibleRect));
if (targetPoint.x < 0)
{
targetPoint.x = 0;
}
[self scrollPoint: targetPoint];
return !NSEqualRects(visibleRect, [[self enclosingScrollView] documentVisibleRect]);
}
- (BOOL) scrollRight: (float)amount
{
if (![self enclosingScrollView])
{
return NO;
}
NSAssert(amount > 0, @"negative amount");
NSRect visibleRect = [[self enclosingScrollView] documentVisibleRect];
NSPoint targetPoint = NSMakePoint(NSMinX(visibleRect) + amount,
NSMinY(visibleRect));
float maxX = NSWidth([self frame]) - NSWidth(visibleRect);
if (targetPoint.x > maxX)
{
targetPoint.x = maxX;
}
[self scrollPoint: targetPoint];
return !NSEqualRects(visibleRect, [[self enclosingScrollView] documentVisibleRect]);
}
@end
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