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Implemented pageUp: and pageDown:

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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@14709 72102866-910b-0410-8b05-ffd578937521
This commit is contained in:
Nicola Pero 2002-10-10 19:05:02 +00:00
parent fc2f4ee85c
commit 72d35ad13a
3 changed files with 234 additions and 6 deletions
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95
Source/NSScrollView.m
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@ -344,7 +344,102 @@ static float scrollerWidth;
[_vertRuler setNeedsDisplay: YES];
}
}
}
/**
* Scrolls the receiver by simply invoking scrollPageUp:
*/
- (void) pageUp: (id)sender
{
[self scrollPageUp: sender];
}
/*
* This code is based on _doScroll: and still may need some tuning.
*/
- (void) scrollPageUp: (id)sender
{
NSRect clipViewBounds;
NSPoint point;
float amount;
if (_contentView == nil)
{
clipViewBounds = NSZeroRect;
}
else
{
clipViewBounds = [_contentView bounds];
}
point = clipViewBounds.origin;
/*
* Take verticalPageScroll into accout, but try to make sure
* that amount is never negative (ie do not scroll backwards.)
*
* FIXME: It seems _doScroll and scrollWheel: should also take
* care not to do negative scrolling.
*/
amount = clipViewBounds.size.height - _vPageScroll;
amount = (amount < 0) ? 0 : amount;
if (_contentView != nil && !_contentView->_rFlags.flipped_view)
{
amount = -amount;
}
point.y = clipViewBounds.origin.y - amount;
[_contentView scrollToPoint: point];
if (_rulersVisible == YES && _hasVertRuler == YES)
{
[_vertRuler setNeedsDisplay: YES];
}
}
/**
* Scrolls the receiver by simply invoking scrollPageUp:
*/
- (void) pageDown: (id)sender
{
[self scrollPageDown: sender];
}
/*
* This code is based on _doScroll:. and still may need some tuning.
*/
- (void) scrollPageDown: (id)sender
{
NSRect clipViewBounds;
NSPoint point;
float amount;
if (_contentView == nil)
{
clipViewBounds = NSZeroRect;
}
else
{
clipViewBounds = [_contentView bounds];
}
point = clipViewBounds.origin;
/*
* Take verticalPageScroll into accout, but try to make sure
* that amount is never negativ (ie do not scroll backwards.)
*
* FIXME: It seems _doScroll and scrollWheel: should also take
* care not to do negative scrolling.
*/
amount = clipViewBounds.size.height - _vPageScroll;
amount = (amount < 0) ? 0 : amount;
if (_contentView != nil && !_contentView->_rFlags.flipped_view)
{
amount = -amount;
}
point.y = clipViewBounds.origin.y + amount;
[_contentView scrollToPoint: point];
if (_rulersVisible == YES && _hasVertRuler == YES)
{
[_vertRuler setNeedsDisplay: YES];
}
}
- (void) _doScroll: (NSScroller*)scroller