//

// THNotesTextView.m

// THNotesTextViewExample

//

// Created by Hannes Tribus on 12/05/14.

// Copyright (c) 2014 3Bus. All rights reserved.

//

#import "THNotesTextView.h"

#define DEFAULT_VERTICAL_COLOR [UIColor colorWithRed:178.0/255.0 green:210.0/255.0 blue:241.0/255.0 alpha:1.0f]

#define DEFAULT_HORIZONTAL_COLOR [UIColor colorWithRed:255.0/255.0 green:214.0/255.0 blue:207.0/255.0 alpha:1.0f]

#define DEFAULT_MARGINS UIEdgeInsetsMake(10.0f, 20.0f, 0.0f, 20.0f)

@implementation THNotesTextView

@synthesize horizontalLineColor = _horizontalLineColor;

@synthesize verticalLineColor = _verticalLineColor;

@synthesize dottedLines = _dottedLines;

+ (void)initialize {

if (self == [THNotesTextView class])

{

id appearance = [self appearance];

[appearance setContentMode:UIViewContentModeRedraw];

[appearance setHorizontalLineColor:DEFAULT_HORIZONTAL_COLOR];

[appearance setVerticalLineColor:DEFAULT_VERTICAL_COLOR];

[appearance setMargins:DEFAULT_MARGINS];

}

}

#pragma mark - Setup/Teardown

- (void)setup {

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textDidChangeNotification:) name:UITextViewTextDidChangeNotification object:nil];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidChangeFrame:) name:UIKeyboardDidChangeFrameNotification object:nil];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];

}

-(id)initWithFrame:(CGRect)frame {

self = [super initWithFrame:frame];

if (self) {

[self setup];

}

return self;

}

-(void)awakeFromNib {

[self setup];

}

-(void)dealloc {

[[NSNotificationCenter defaultCenter] removeObserver:self];

#if !__has_feature(objc_arc)

[super dealloc];

#endif

}

- (void)setContentSize:(CGSize)contentSize {

contentSize = (CGSize) {

.width = contentSize.width - self.margins.left - self.margins.right,

.height = contentSize.height

};

NSLog(@"width: %f, height %f",contentSize.width,contentSize.height);

[super setContentSize:contentSize];

}

- (void)setMargins:(UIEdgeInsets)margins {

_margins = margins;

self.contentInset = (UIEdgeInsets) {

.top = self.margins.top,

.left = self.margins.left,

.bottom = self.margins.bottom,

.right = self.margins.right - self.margins.left

};

self.textContainerInset = (UIEdgeInsets) {

.top = self.margins.top,

.left = 0,

.bottom = self.margins.bottom,

.right = self.margins.right + self.margins.left

};

[self setContentSize:self.contentSize];

}

- (void)scrollToCaretAnimated:(BOOL)animated {

CGRect rect = [self caretRectForPosition:self.selectedTextRange.end];

rect.size.height += self.textContainerInset.bottom;

[self scrollRectToVisible:rect animated:animated];

}

- (UIColor *)horizontalLineColor {

if (!_horizontalLineColor) _horizontalLineColor = DEFAULT_HORIZONTAL_COLOR;

return _horizontalLineColor;

}

- (UIColor *)verticalLineColor {

if (!_verticalLineColor) _verticalLineColor = DEFAULT_VERTICAL_COLOR;

return _verticalLineColor;

}

- (void)drawRect:(CGRect)rect {

CGContextRef context = UIGraphicsGetCurrentContext();

CGFloat lineSpacing = 1.01f;

if (self.horizontalLineColor) {

CGContextSetLineWidth(context, 1.0f);

if ([self isDottedLines]) {

CGFloat dash[] = {1.0, 1.0};

CGContextSetLineDash(context, 0.0, dash, 2);

}

CGContextBeginPath(context);

CGContextSetStrokeColorWithColor(context, self.horizontalLineColor.CGColor);

// Create un-mutated floats outside of the for loop.

// Reduces memory access.

CGFloat baseOffset = self.margins.top + self.font.descender + 1.0;

CGFloat screenScale = [UIScreen mainScreen].scale;

CGFloat boundsX = self.bounds.origin.x;

CGFloat boundsWidth = self.bounds.size.width;

// Only draw lines that are visible on the screen.

// (As opposed to throughout the entire view's contents)

NSInteger firstVisibleLine = MAX(1, (self.contentOffset.y / (self.font.lineHeight * lineSpacing)));

NSInteger lastVisibleLine = ceilf((self.contentOffset.y + self.bounds.size.height) / (self.font.lineHeight * lineSpacing));

for (NSInteger line = firstVisibleLine; line <= lastVisibleLine; ++line)

{

CGFloat linePointY = (baseOffset + (self.font.lineHeight * line * lineSpacing));

// Rounding the point to the nearest pixel.

// Greatly reduces drawing time.

CGFloat roundedLinePointY = roundf(linePointY * screenScale) / screenScale;

//NSLog(@"linePointYRounded %f (%f)",roundedLinePointY, linePointY);

CGContextMoveToPoint(context, boundsX, roundedLinePointY);

CGContextAddLineToPoint(context, boundsWidth, roundedLinePointY);

}

CGContextClosePath(context);

CGContextStrokePath(context);

}

if (self.verticalLineColor) {

if ([self isDottedLines]) {

CGFloat dash[] = {0.5, 1.5};

CGContextSetLineDash(context, 0.0, dash, 2);

}

// left

CGContextBeginPath(context);

CGContextSetStrokeColorWithColor(context, self.verticalLineColor.CGColor);

CGContextMoveToPoint(context, -1.0f, self.contentOffset.y);

CGContextAddLineToPoint(context, -1.0f, self.contentOffset.y + self.bounds.size.height);

CGContextClosePath(context);

CGContextStrokePath(context);

// right

CGContextBeginPath(context);

CGContextSetStrokeColorWithColor(context, self.verticalLineColor.CGColor);

CGContextMoveToPoint(context, -1.0f + self.contentSize.width, self.contentOffset.y);

CGContextAddLineToPoint(context, -1.0f + self.contentSize.width, self.contentOffset.y + self.bounds.size.height);

CGContextClosePath(context);

CGContextStrokePath(context);

}

}

#pragma mark - Notifications

- (void)textDidChangeNotification:(NSNotification*)notification {

[self scrollToCaretAnimated:NO];

}

- (void)keyboardWillHide:(NSNotification*)notification {

[self setMargins:DEFAULT_MARGINS];

}

- (void)keyboardDidChangeFrame:(NSNotification*)notification {

NSDictionary* keyboardInfo = [notification userInfo];

CGRect keyboardFrameBeginRect = [[keyboardInfo valueForKey:UIKeyboardFrameBeginUserInfoKey]CGRectValue];

UIEdgeInsets tmp = DEFAULT_MARGINS;

tmp.bottom = [[UIDevice currentDevice] orientation] == UIDeviceOrientationLandscapeLeft || [[UIDevice currentDevice] orientation] == UIDeviceOrientationLandscapeRight ?

keyboardFrameBeginRect.size.width : keyboardFrameBeginRect.size.height;

tmp.right = tmp.right - tmp.left;

[self setContentInset:tmp];

[self scrollToCaretAnimated:NO];

}

@end