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(-mouseDown:): When the mouse is outside the view, autoscroll smoothly using periodic events.

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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@18093 72102866-910b-0410-8b05-ffd578937521
This commit is contained in:
Alexander Malmberg 2003-11-19 02:21:36 +00:00
parent 7c754b0a27
commit 7f4b949153
1 changed files with 48 additions and 4 deletions
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52
Source/NSTextView.m
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@ -4091,19 +4091,29 @@ other than copy/paste or dragging. */
/* Enter modal loop tracking the mouse */
{
unsigned int mask = NSLeftMouseDraggedMask | NSLeftMouseUpMask;
NSEvent *currentEvent, *lastEvent = nil;
unsigned int mask = NSLeftMouseDraggedMask | NSLeftMouseUpMask
| NSPeriodicMask;
NSEvent *currentEvent;
NSEvent *lastEvent = nil; /* Last non-periodic event. */
NSDate *distantPast = [NSDate distantPast];
BOOL gettingPeriodic, gotPeriodic;
currentEvent = [_window nextEventMatchingMask: mask
untilDate: nil
inMode: NSEventTrackingRunLoopMode
dequeue: YES];
gettingPeriodic = NO;
do
{
gotPeriodic = NO;
while (currentEvent && [currentEvent type] != NSLeftMouseUp)
{
lastEvent = currentEvent;
if ([currentEvent type] == NSPeriodic)
{
gotPeriodic = YES;
}
else
lastEvent = currentEvent;
currentEvent = [_window nextEventMatchingMask: mask
untilDate: distantPast
inMode: NSEventTrackingRunLoopMode
@ -4112,7 +4122,36 @@ other than copy/paste or dragging. */
if (currentEvent && [currentEvent type] == NSLeftMouseUp)
break;
[self autoscroll: lastEvent];
/*
Automatic scrolling.
If we aren't getting periodic events, we check all events. If any of
them causes us to scroll, we scroll and start up the periodic events.
If we are getting periodic events, we only scroll when we receive a
periodic event (and we use the last non-periodic event to determine
how far). If no scrolling occurred, we stop the periodic events.
*/
if (!gettingPeriodic)
{
if ([self autoscroll: lastEvent])
{
gettingPeriodic = YES;
[NSEvent startPeriodicEventsAfterDelay: 0.1
withPeriod: 0.1];
}
}
else if (gotPeriodic)
{
if (![self autoscroll: lastEvent])
{
gettingPeriodic = NO;
[NSEvent stopPeriodicEvents];
}
}
point = [self convertPoint: [lastEvent locationInWindow]
fromView: nil];
proposedRange = MakeRangeFromAbs([self characterIndexForPoint: point],
@ -4127,6 +4166,11 @@ other than copy/paste or dragging. */
inMode: NSEventTrackingRunLoopMode
dequeue: YES];
} while ([currentEvent type] != NSLeftMouseUp);
if (gettingPeriodic)
{
[NSEvent stopPeriodicEvents];
}
}
NSDebugLog(@"chosenRange. location = %d, length = %d\n",