/*

     File: HoverTableRowView.m 

 Abstract: Custom NSTableRowView class for custom drawing and mouse tracking feedback via NSTrackingArea 

  Version: 1.1 

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 */

#import "HoverTableRowView.h"

@interface HoverTableRowView ()

@property BOOL mouseInside;

@end

@implementation HoverTableRowView

@dynamic mouseInside;

- (void)dealloc {

    [trackingArea release];

    [super dealloc];

}

- (void)setMouseInside:(BOOL)value {

    if (mouseInside != value) {

        mouseInside = value;

        [self setNeedsDisplay:YES];

    }

}

- (BOOL)mouseInside {

    return mouseInside;

}

- (void)ensureTrackingArea {

    if (trackingArea == nil) {

        trackingArea = [[NSTrackingArea alloc] initWithRect:NSZeroRect options:NSTrackingInVisibleRect | NSTrackingActiveAlways | NSTrackingMouseEnteredAndExited owner:self userInfo:nil];

    }

}

- (void)updateTrackingAreas {

    [super updateTrackingAreas];

    [self ensureTrackingArea];

    if (![[self trackingAreas] containsObject:trackingArea]) {

        [self addTrackingArea:trackingArea];

    }

}

- (void)mouseEntered:(NSEvent *)theEvent {

    self.mouseInside = YES;

}

- (void)mouseExited:(NSEvent *)theEvent {

    self.mouseInside = NO;

}

static NSGradient *gradientWithTargetColor(NSColor *targetColor) {

    NSArray *colors = [NSArray arrayWithObjects:[targetColor colorWithAlphaComponent:0], targetColor, targetColor, [targetColor colorWithAlphaComponent:0], nil];

    const CGFloat locations[4] = { 0.0, 0.35, 0.65, 1.0 };

    return [[[NSGradient alloc] initWithColors:colors atLocations:locations colorSpace:[NSColorSpace sRGBColorSpace]] autorelease];

}

- (void)drawBackgroundInRect:(NSRect)dirtyRect {

    // Custom background drawing. We don't call super at all.

    [self.backgroundColor set];

    // Fill with the background color first

    NSRectFill(self.bounds);

    // Draw a white/alpha gradient

    if (self.mouseInside) {

        NSGradient *gradient = gradientWithTargetColor([NSColor whiteColor]);

        [gradient drawInRect:self.bounds angle:0];

    }

}

- (NSRect)separatorRect {

    NSRect separatorRect = self.bounds;

    separatorRect.origin.y = NSMaxY(separatorRect) - 1;

    separatorRect.size.height = 1;

    return separatorRect;

}

// Only called if the table is set with a horizontal grid

- (void)drawSeparatorInRect:(NSRect)dirtyRect {

    // Use a common shared method of drawing the separator

    DrawSeparatorInRect([self separatorRect]);

}

// Only called if the 'selected' property is yes.

- (void)drawSelectionInRect:(NSRect)dirtyRect {

    // Check the selectionHighlightStyle, in case it was set to None

    if (self.selectionHighlightStyle != NSTableViewSelectionHighlightStyleNone) {

        // We want a hard-crisp stroke, and stroking 1 pixel will border half on one side and half on another, so we offset by the 0.5 to handle this

        NSRect selectionRect = NSInsetRect(self.bounds, 5.5, 5.5);

        [[NSColor colorWithCalibratedWhite:.72 alpha:1.0] setStroke];

        [[NSColor colorWithCalibratedWhite:.82 alpha:1.0] setFill];

        NSBezierPath *selectionPath = [NSBezierPath bezierPathWithRoundedRect:selectionRect xRadius:10 yRadius:10];

        [selectionPath fill];

        [selectionPath stroke];

    }

}

// interiorBackgroundStyle is normaly "dark" when the selection is drawn (self.selected == YES) and we are in a key window (self.emphasized == YES). However, we always draw a light selection, so we override this method to always return a light color.

- (NSBackgroundStyle)interiorBackgroundStyle {

    return NSBackgroundStyleLight;  

}

- (void)setFrame:(NSRect)frameRect {

    [super setFrame:frameRect];

    // We need to invalidate more things when live-resizing since we fill with a gradient and stroke

    if ([self inLiveResize]) {

        // Redraw everything if we are using a gradient

        if (self.selected || self.mouseInside) {

            [self setNeedsDisplay:YES];

        } else {

            // Redraw our horizontal grid line, which is a gradient

            [self setNeedsDisplayInRect:[self separatorRect]];

        }

    }

}

@end

void DrawSeparatorInRect(NSRect rect) {

    // Cache the gradient for performance

    static NSGradient *gradient = nil;

    if (gradient == nil) {

        gradient = [gradientWithTargetColor([NSColor colorWithSRGBRed:.80 green:.80 blue:.80 alpha:1]) retain];

    }

    [gradient drawInRect:rect angle:0];

}