/*

     File: FlashView.m

 Abstract: A simple NSView subclass which will redraw using a configurable color upon call to flash:, then fade back to normal. The flash is done in the background, via an NSTimer. Default flash color is red.

  Version: 1.0

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#import "FlashView.h"

static const CGFloat DELTA_T = 0.01;

static const CGFloat DELTA_ALPHA = 0.05;

@implementation FlashView

@synthesize flashColor;

- (id)initWithFrame:(NSRect)frame {

    self = [super initWithFrame:frame];

    if (self) {

        self.flashColor = [NSColor redColor];

        flashAlpha = 0.0;

    }

    return self;

}

- (void)dealloc {

    self.flashColor = nil;

    [flashTimer release];

    [super dealloc];

}

- (void)drawRect:(NSRect)rect {

    if (flashAlpha >= DELTA_ALPHA) {

        [[self.flashColor colorWithAlphaComponent:flashAlpha] set];

        NSRectFillUsingOperation(rect, NSCompositeSourceOver);

    }

}

- (BOOL)isOpaque {

    return NO;

}

- (IBAction)flash:(id)sender {

    flashAlpha = 1.0;

    [self setNeedsDisplay:YES];

    if (!flashTimer) {

        flashTimer = [[NSTimer timerWithTimeInterval:DELTA_T target:self selector:@selector(fadeFlash:) userInfo:nil repeats:YES] retain];

    [[NSRunLoop currentRunLoop] addTimer:flashTimer forMode:NSRunLoopCommonModes];

    }

}

- (void)fadeFlash:(NSTimer *)timer {

    flashAlpha -= DELTA_ALPHA;

    [self setNeedsDisplay:YES];

    if (flashAlpha < DELTA_ALPHA) {

        flashAlpha = 0.0;

        [flashTimer invalidate];

        [flashTimer release];

        flashTimer = nil;

    }

}

@end