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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 "CenteringClipView.h"
@implementation CenteringClipView
- (id) initWithFrame: (NSRect)aFrame
{
return [super initWithFrame: aFrame];
}
- (void) centerDocumentView
{
NSRect docRect = [[self documentView] frame];
NSRect clipRect = [self bounds];
if(docRect.size.width < clipRect.size.width)
{
clipRect.origin.x = (docRect.size.width - clipRect.size.width) / 2.0;
}
if(docRect.size.height < clipRect.size.height)
{
clipRect.origin.y = (docRect.size.height - clipRect.size.height) / 2.0;
}
// Probably the most efficient way to move the bounds origin.
[self scrollToPoint: clipRect.origin];
// We could use this instead since it allows a scroll view to
// coordinate scrolling between multiple clip views.
//[[self superview] scrollClipView:self toPoint:clipRect.origin];
}
// We need to override this so that the superclass doesn't override our new
// origin point.
- (NSPoint) constrainScrollPoint: (NSPoint)proposedNewOrigin
{
NSRect docRect = [[self documentView] frame];
NSRect clipRect = [self bounds];
NSPoint newScrollPoint = proposedNewOrigin;
float maxX = docRect.size.width - clipRect.size.width;
float maxY = docRect.size.height - clipRect.size.height;
// If the clip view is wider than the doc, we can't scroll horizontally
if(docRect.size.width < clipRect.size.width)
{
newScrollPoint.x = maxX / 2.0;
}
else
{
newScrollPoint.x = MAX(0, MIN(newScrollPoint.x,maxX));
}
// If the clip view is taller than the doc, we can't scroll vertically
if(docRect.size.height < clipRect.size.height)
{
newScrollPoint.y = maxY / 2.0;
}
else
{
newScrollPoint.y = MAX(0, MIN(newScrollPoint.y,maxY));
}
return newScrollPoint;
}
- (void) viewBoundsChanged: (NSNotification*)aNotification
{
[super viewBoundsChanged: aNotification];
[self centerDocumentView];
}
- (void) viewFrameChanged: (NSNotification*)aNotification
{
[super viewFrameChanged: aNotification];
[self centerDocumentView];
}
- (void) setFrame: (NSRect)aFrame
{
[super setFrame: aFrame];
[self centerDocumentView];
}
- (void) setFrameOrigin: (NSPoint)aPoint
{
[super setFrameOrigin: aPoint];
[self centerDocumentView];
}
- (void) setFrameSize: (NSSize)aSize
{
[super setFrameSize: aSize];
[self centerDocumentView];
}
- (void) setFrameRotation: (float)anAngle
{
[super setFrameRotation: anAngle];
[self centerDocumentView];
}
@end
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