Hi,
I am using the following two methods for a scrolling number box which
is essentially a slider in the form of a NSTextField subclass. I have
yet to implement this for my custom sliders but maybe this is a good
starting point for you? When I first dabbled with custom sliders all
I did was override the mouseUp, mouseDown, mouseDragged methods etc
now my custom sliders are subclasses of NSControl rather than NSSlider.
-(void)mouseUp:(NSEvent*)theEvent
{
if(drag) drag = NO;
}
-(void)mouseDragged:(NSEvent*)theEvent
{
float val = [self floatValue];
if(!drag) {
// float start_x = [self convertPoint: [theEvent locationInWindow]
fromView: nil].x;
start_y = [self convertPoint:[theEvent locationInWindow] fromView:
nil].y;
prev_y = start_y;
drag = YES;
};
// key modifier key flags
unsigned int flags;
flags = [theEvent modifierFlags];
float next_y = [self convertPoint:[theEvent locationInWindow]
fromView: nil].y;
float deltaY = (next_y - prev_y) / dragSize;
prev_y = next_y;
if(flags & NSAlternateKeyMask) deltaY *= fineGrain;
val += range * deltaY;
[self checkBounds:&val];
[self setFloatValue:val];
// continuously send the action
[self sendAction:(SEL)[self action] to:(id)[self target]];
}
Hope that helps,
Stephen
On 23 Jul 2009, at 13:29, Jean-Daniel Dupas wrote:
Le 23 juil. 09 à 21:09, livinginlosange...@mac.com a écrit :
I am employing an NSSliderCell in my table view, and I want to slow
down the rate of change or increase the resolution of change using
a modifier key like commands as I drag. This is employed in a few
audio programs to assist a mixer in fine tuning either volume or
pan when mixing. Where do I start? I have bound my NSSliderCell to
a NSNumber in my NSObjectController. Can anyone think of a way that
I could modify the delta of change? Would I have to do this using a
NSSliderCell subclass? Any thoughts?
Just an idea. (not tested at all)
A possibility may be to override setDoubleValue: or whatever is used
to set the cell value, and check if the current event ([NSApp
currentEvent]) is a drag with ctrl down, and if this is the case
compute the delta between the current value and the new value and
reduce it proportionally before calling the super implementation.
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/stephen.blinkhorn%40audiospillage.com
This email sent to stephen.blinkh...@audiospillage.com
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to arch...@mail-archive.com
