//

//  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] = {   0.988, 0.988, 0.988, 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:0.7 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) / 2.0);

    gripRect.origin.y = ((rect.size.height - gripRect.size.height) / 2.0);

    float stripThickness = 1.0;

    UIColor *stripColor = [UIColor colorWithWhite:0.35 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