Re: NSSliderCell question
Re: NSSliderCell question
- Subject: Re: NSSliderCell question
- From: Stephen Blinkhorn <email@hidden>
- Date: Thu, 23 Jul 2009 15:04:58 -0600
Oh, where:
range = max_slider_value - min_slider_value;
fineGrain = 0.125;
Stephen
On 23 Jul 2009, at 14:55, Stephen Blinkhorn wrote:
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, email@hidden 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.
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