RProgressIndicator.m

/*
 *  R.app : a Cocoa front end to: "R A Computer Language for Statistical Data Analysis"
 *  
 *  R.app Copyright notes:
 *                     Copyright (C) 2004-12  The R Foundation
 *                     written by Stefano M. Iacus and Simon Urbanek
 *
 *                  
 *  R Copyright notes:
 *                     Copyright (C) 1995-1996   Robert Gentleman and Ross Ihaka
 *                     Copyright (C) 1998-2001   The R Development Core Team
 *                     Copyright (C) 2002-2004   The R Foundation
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  A copy of the GNU General Public License is available via WWW at
 *  http://www.gnu.org/copyleft/gpl.html.  You can also obtain it by
 *  writing to the Free Software Foundation, Inc., 59 Temple Place,
 *  Suite 330, Boston, MA  02111-1307  USA.
 *
 *  RProgressIndicator.m
 *
 *  Created by Hans-J. Bibiko on 02/04/2012.
 *
 */

#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