//

//  MGSplitDividerView.m

//  MGSplitView

//

//  Created by Matt Gemmell on 26/07/2010.

//  Copyright 2010 Instinctive Code.

//

#import "MGSplitDividerView.h"

#import "MGSplitViewController.h"

@implementation MGSplitDividerView

#pragma mark -

#pragma mark Setup and teardown

- (id)initWithFrame:(CGRect)frame

{

	if ((self = [super initWithFrame:frame])) {

		self.userInteractionEnabled = NO;

		self.allowsDragging = NO;

		self.contentMode = UIViewContentModeRedraw;

	}

	return self;

}

- (void)dealloc

{

	self.splitViewController = nil;

    [super dealloc];

}

#pragma mark -

#pragma mark Drawing

- (void)drawRect:(CGRect)rect

{

	if (splitViewController.dividerStyle == MGSplitViewDividerStyleThin) {

		[super drawRect:rect];

	} else if (splitViewController.dividerStyle == MGSplitViewDividerStylePaneSplitter) {

		// Draw gradient background.

		CGRect bounds = self.bounds;

		CGColorSpaceRef rgb = CGColorSpaceCreateDeviceRGB();

		CGFloat locations[2] = {0, 1};

		CGFloat components[8] = {	0.988f, 0.988f, 0.988f, 1.0,  // light

									0.875, 0.875, 0.875, 1.0 };// dark

		CGGradientRef gradient = CGGradientCreateWithColorComponents (rgb, components, locations, 2);

		CGContextRef context = UIGraphicsGetCurrentContext();

		CGPoint start, end;

		if (splitViewController.vertical) {

			// Light left to dark right.

			start = CGPointMake(CGRectGetMinX(bounds), CGRectGetMidY(bounds));

			end = CGPointMake(CGRectGetMaxX(bounds), CGRectGetMidY(bounds));

		} else {

			// Light top to dark bottom.

			start = CGPointMake(CGRectGetMidX(bounds), CGRectGetMinY(bounds));

			end = CGPointMake(CGRectGetMidX(bounds), CGRectGetMaxY(bounds));

		}

		CGContextDrawLinearGradient(context, gradient, start, end, 0);

		CGColorSpaceRelease(rgb);

		CGGradientRelease(gradient);

		// Draw borders.

		float borderThickness = 1.0;

		[[UIColor colorWithWhite:0.7f alpha:1.0] set];

		CGRect borderRect = bounds;

		if (splitViewController.vertical) {

			borderRect.size.width = borderThickness;

			UIRectFill(borderRect);

			borderRect.origin.x = CGRectGetMaxX(bounds) - borderThickness;

			UIRectFill(borderRect);

		} else {

			borderRect.size.height = borderThickness;

			UIRectFill(borderRect);

			borderRect.origin.y = CGRectGetMaxY(bounds) - borderThickness;

			UIRectFill(borderRect);

		}

		// Draw grip.

		[self drawGripThumbInRect:bounds];

	}

}

- (void)drawGripThumbInRect:(CGRect)rect

{

	float width = 9.0;

	float height;

	if (splitViewController.vertical) {

		height = 30.0;

	} else {

		height = width;

		width = 30.0;

	}

	// Draw grip in centred in rect.

	CGRect gripRect = CGRectMake(0, 0, width, height);

	gripRect.origin.x = ((rect.size.width - gripRect.size.width) / 2.f);

	gripRect.origin.y = ((rect.size.height - gripRect.size.height) / 2.f);

	float stripThickness = 1.0;

	UIColor *stripColor = [UIColor colorWithWhite:0.35f alpha:1.0];

	UIColor *lightColor = [UIColor colorWithWhite:1.0 alpha:1.0];

	float space = 3.0;

	if (splitViewController.vertical) {

		gripRect.size.width = stripThickness;

		[stripColor set];

		UIRectFill(gripRect);

		gripRect.origin.x += stripThickness;

		gripRect.origin.y += 1;

		[lightColor set];

		UIRectFill(gripRect);

		gripRect.origin.x -= stripThickness;

		gripRect.origin.y -= 1;

		gripRect.origin.x += space + stripThickness;

		[stripColor set];

		UIRectFill(gripRect);

		gripRect.origin.x += stripThickness;

		gripRect.origin.y += 1;

		[lightColor set];

		UIRectFill(gripRect);

		gripRect.origin.x -= stripThickness;

		gripRect.origin.y -= 1;

		gripRect.origin.x += space + stripThickness;

		[stripColor set];

		UIRectFill(gripRect);

		gripRect.origin.x += stripThickness;

		gripRect.origin.y += 1;

		[lightColor set];

		UIRectFill(gripRect);

	} else {

		gripRect.size.height = stripThickness;

		[stripColor set];

		UIRectFill(gripRect);

		gripRect.origin.y += stripThickness;

		gripRect.origin.x -= 1;

		[lightColor set];

		UIRectFill(gripRect);

		gripRect.origin.y -= stripThickness;

		gripRect.origin.x += 1;

		gripRect.origin.y += space + stripThickness;

		[stripColor set];

		UIRectFill(gripRect);

		gripRect.origin.y += stripThickness;

		gripRect.origin.x -= 1;

		[lightColor set];

		UIRectFill(gripRect);

		gripRect.origin.y -= stripThickness;

		gripRect.origin.x += 1;

		gripRect.origin.y += space + stripThickness;

		[stripColor set];

		UIRectFill(gripRect);

		gripRect.origin.y += stripThickness;

		gripRect.origin.x -= 1;

		[lightColor set];

		UIRectFill(gripRect);

	}

}

#pragma mark -

#pragma mark Interaction

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event

{

	UITouch *touch = [touches anyObject];

	if (touch) {

		CGPoint lastPt = [touch previousLocationInView:self];

		CGPoint pt = [touch locationInView:self];

		float offset = (splitViewController.vertical) ? pt.x - lastPt.x : pt.y - lastPt.y;

		if (!splitViewController.masterBeforeDetail) {

			offset = -offset;

		}

		splitViewController.splitPosition = splitViewController.splitPosition + offset;

	}

}

#pragma mark -

#pragma mark Accessors and properties

- (void)setAllowsDragging:(BOOL)flag

{

	if (flag != allowsDragging) {

		allowsDragging = flag;

		self.userInteractionEnabled = allowsDragging;

	}

}

@synthesize splitViewController;

@synthesize allowsDragging;

@end