#import "ScriptEditorViewController.h"

#import "TKAlertView.h"

#import "UIViewAdditions.h"

@interface ScriptEditorViewController ()<UITextViewDelegate>

@property (nonatomic, strong) NSString *scriptPath;

@property (nonatomic, strong) UITextView *textView;

@property (nonatomic, assign) BOOL hasChange;

@property (nonatomic, strong) dispatch_source_t source;

@implementation ScriptEditorViewController

- (id)initWithScriptPath:(NSString *)scriptPath {

self = [super init];

if (self) {

self.scriptPath = scriptPath;

self.title = [scriptPath lastPathComponent];

self.hasChange = NO;

}

return self;

}

-(void)viewWillAppear:(BOOL)animated{

[super viewWillAppear:animated];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrameNotification:) name:UIKeyboardWillChangeFrameNotification object:nil];

}

-(void)viewWillDisappear:(BOOL)animated{

[super viewWillDisappear:animated];

[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillChangeFrameNotification object:nil];

}

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view.

UITextView *textView = [[UITextView alloc] initWithFrame:self.view.bounds];

textView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

textView.alwaysBounceVertical = YES;

textView.delegate = self;

textView.backgroundColor = [UIColor whiteColor];

textView.font = [UIFont systemFontOfSize:14];

textView.text = [NSString stringWithContentsOfFile:self.scriptPath usedEncoding:nil error:nil];

[self.view addSubview:textView];

self.textView = textView;

UIButton *backButton = [UIButton buttonWithType:UIButtonTypeSystem];

backButton.titleLabel.font = [UIFont systemFontOfSize:17];

[backButton setTitle:@"返回" forState:UIControlStateNormal];

[backButton setImage:[UIImage imageNamed:@"back_indicator_image"] forState:UIControlStateNormal];

[backButton setFrame:CGRectMake(0, 0, 25 + 22 + backButton.imageView.frame.size.width , 44)];

[backButton setClipsToBounds:NO];

[backButton setImageEdgeInsets:UIEdgeInsetsMake(0, - 15, 0, 0)];

[backButton setTitleEdgeInsets:UIEdgeInsetsMake(0, backButton.imageEdgeInsets.left+15, 0, 0)];

[backButton addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];

self.navigationItem.leftBarButtonItem = backItem;

UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"保存"

style:UIBarButtonItemStylePlain

target:self

action:@selector(save)];

self.navigationItem.rightBarButtonItem = barButtonItem;

[self startMonitorForFilePath:self.scriptPath];

}

- (void)save {

NSError *error = nil;

BOOL success = [self.textView.text writeToFile:self.scriptPath atomically:YES encoding:NSUTF8StringEncoding error:&error];

if (success) {

self.hasChange = NO;

} else {

TKAlertView * alertView = [TKAlertView alertWithTitle:@"保存出错" message:[error description]];

[alertView addButtonWithTitle:@"确定" block:nil];

[alertView show];

}

}

- (void)back {

if (self.hasChange) {

TKAlertView * alertView = [TKAlertView alertWithTitle:nil message:@"确定要放弃所有修改吗？"];

[alertView addButtonWithTitle:@"确定" block:^{

[self.navigationController popViewControllerAnimated:YES];

}];

[alertView addButtonWithTitle:@"取消" block:nil];

[alertView show];

} else {

[self.navigationController popViewControllerAnimated:YES];

}

}

- (void)dealloc {

[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillChangeFrameNotification object:nil];

[self stopMonitor];

}

#pragma mark - UITextViewDelegate

- (void)textViewDidChange:(UITextView *)textView {

self.hasChange = YES;

}

-(void) keyboardWillChangeFrameNotification:(NSNotification *)note{

// // get keyboard size and loctaion

// CGRect keyboardBounds;

// [[note.userInfo valueForKey:UIKeyboardFrameEndUserInfoKey] getValue: &keyboardBounds];

//

// // Need to translate the bounds to account for rotation.

// keyboardBounds = [self.view convertRect:keyboardBounds toView:nil];

// self.view.bottom = [UIScreen mainScreen].bounds.size.height - keyboardBounds.size.height;

//

// get keyboard size and loctaion

CGRect keyboardBounds;

[[note.userInfo valueForKey:UIKeyboardFrameEndUserInfoKey] getValue: &keyboardBounds];

NSNumber *duration = [note.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];

NSNumber *curve = [note.userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey];

// Need to translate the bounds to account for rotation.

keyboardBounds = [self.view convertRect:keyboardBounds toView:nil];

if ([duration doubleValue]) {

// animations settings

[UIView beginAnimations:nil context:NULL];

[UIView setAnimationBeginsFromCurrentState:YES];

[UIView setAnimationDuration:[duration doubleValue]];

[UIView setAnimationCurve:[curve integerValue]];

[UIView setAnimationDelegate:self];

}

// set views with new info

self.textView.height = self.view.height - keyboardBounds.size.height;

if ([duration doubleValue]) {

// commit animations

[UIView commitAnimations];

}

}

- (void)startMonitorForFilePath:(NSString *)filePath

{

[self stopMonitor];

int fd = open(filePath.UTF8String, O_EVTONLY);

if (fd == -1)

return;

dispatch_queue_t queue = dispatch_get_main_queue();

dispatch_source_t source = dispatch_source_create(DISPATCH_SOURCE_TYPE_VNODE, fd, DISPATCH_VNODE_WRITE | DISPATCH_VNODE_DELETE, queue);

self.source = source;

if (source)

{

dispatch_source_set_event_handler(source, ^{

self.textView.text = [NSString stringWithContentsOfFile:self.scriptPath usedEncoding:nil error:nil];

});

dispatch_source_set_cancel_handler(source, ^{

close(fd);

});

dispatch_resume(source);

} else {

close(fd);

}

}

- (void)stopMonitor {

if (self.source) {

dispatch_source_cancel(self.source);

self.source = nil;

}

}