The R Project SVN R-packages

//
//  RProgressIndicator.m
//  R
//
//  Created by Bibiko on 03.02.12.
//  Copyright 2012 __MyCompanyName__. All rights reserved.
//

#import "RProgressIndicator.h"


@implementation RProgressIndicator


// draw a gradient background behind the fints to
// make the spinner visible even for dark background colors
- (void)drawRect:(NSRect)dirtyRect 
{ 

    // Get the spinner's background color drawed by its superview's window
    NSColor *backGround = [[[self superview] window] backgroundColor];

    // just in case bail if nothing set
    if(!backGround) return;

    // Do nothing for white background
    if(backGround == [NSColor whiteColor]) return;

    NSColor *startColor, *endColor;
    if(_isRunning) {
        startColor = [NSColor whiteColor];
        // special case for pure black backround
        if(([[backGround colorUsingColorSpaceName:NSCalibratedWhiteColorSpace] whiteComponent] == 0.0))
            endColor = backGround;
        else 
            endColor = [NSColor clearColor];
    } else {
        startColor = [NSColor clearColor];
        endColor = startColor;
    }

    NSRect bounds = [self bounds];

    // create the gradient
    NSGradient* aGradient = [[[NSGradient alloc] initWithStartingColor:startColor
            endingColor:endColor] autorelease];

    // draw a radial gradient inside circle
    NSBezierPath *circle = [NSBezierPath bezierPathWithOvalInRect:bounds];
    [aGradient drawInBezierPath:circle relativeCenterPosition:NSMakePoint(0,0)];

    // draw a pure filled by the background color circle in the middle
    // of the spinner (looks better)
    [backGround set];
    circle = [NSBezierPath bezierPathWithOvalInRect:NSInsetRect(bounds, 4.8, 4.8)];
    [circle fill];

}

- (void)startAnimation:(id)sender
{
    _isRunning = YES;
    [super startAnimation:sender];
}

- (void)stopAnimation:(id)sender
{
    _isRunning = NO;
    [super stopAnimation:sender];
}

@end