project_files/HedgewarsMobile/Classes/MapPreviewButtonView.m
author alfadur
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/*
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 * Hedgewars-iOS, a Hedgewars port for iOS devices
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 * Copyright (c) 2009-2012 Vittorio Giovara <vittorio.giovara@gmail.com>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; version 2 of the License
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA.
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 */
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#import "MapPreviewButtonView.h"
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#import <pthread.h>
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#import <QuartzCore/QuartzCore.h>
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#define INDICATOR_TAG 7654
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@interface MapPreviewButtonView ()
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@property (nonatomic) NSInteger port;
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@end
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@implementation MapPreviewButtonView
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@synthesize delegate;
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- (id)initWithFrame:(CGRect)frame {
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    if ((self = [super initWithFrame:frame])) {
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        delegate = nil;
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        self.backgroundColor = [UIColor whiteColor];
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        self.layer.cornerRadius = 12;
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    }
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    return self;
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}
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#pragma mark -
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#pragma mark image wrappers
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- (void)setImageRounded:(UIImage *)image forState:(UIControlState)controlState {
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    [self setImage:[image makeRoundCornersOfSize:CGSizeMake(12, 12)] forState:controlState];
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}
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- (void)setImageRounded:(UIImage *)image {
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    [self setImageRounded:image forState:UIControlStateNormal];
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}
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#pragma mark -
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#pragma mark preview
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-(int) sendToEngine:(NSString *)string {
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    unsigned char length = [string lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
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    SDLNet_TCP_Send(csd, &length, 1);
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    return SDLNet_TCP_Send(csd, [string UTF8String], length);
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}
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- (void)engineProtocol:(uint8_t *)unpackedMap {
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    IPaddress ip;
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    BOOL serverQuit = NO;
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    uint8_t packedMap[128*32];
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    self.port = [HWUtils randomPort];
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    if (SDLNet_Init() < 0) {
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        DLog(@"SDLNet_Init: %s", SDLNet_GetError());
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        serverQuit = YES;
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    }
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    // Resolving the host using NULL make network interface to listen
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    if (SDLNet_ResolveHost(&ip, NULL, self.port) < 0) {
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        DLog(@"SDLNet_ResolveHost: %s\n", SDLNet_GetError());
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        serverQuit = YES;
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    }
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    // Open a connection with the IP provided (listen on the host's port)
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    if (!(sd = SDLNet_TCP_Open(&ip))) {
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        DLog(@"SDLNet_TCP_Open: %s %ld\n", SDLNet_GetError(), (long)self.port);
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        serverQuit = YES;
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    }
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    // launch the preview in background here so that we're sure the tcp channel is open
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    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0), ^{
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        NSString *ipcString = [[NSString alloc] initWithFormat:@"%ld", (long)self.port];
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        NSString *documentsDirectory = DOCUMENTS_FOLDER();
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        NSMutableArray *gameParameters = [[NSMutableArray alloc] initWithObjects:
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                                          @"--internal",
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                                          @"--port", ipcString,
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                                          @"--user-prefix", documentsDirectory,
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                                          @"--landpreview",
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                                          nil];
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        int argc = [gameParameters count];
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        const char **argv = (const char **)malloc(sizeof(const char*)*argc);
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        for (int i = 0; i < argc; i++)
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            argv[i] = strdup([[gameParameters objectAtIndex:i] UTF8String]);
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        RunEngine(argc, argv);
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        // cleanup
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        for (int i = 0; i < argc; i++)
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            free((void *)argv[i]);
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        free(argv);
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    });
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    DLog(@"Waiting for a client on port %ld", (long)self.port);
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    while (!serverQuit) {
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        /* This check the sd if there is a pending connection.
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         * If there is one, accept that, and open a new socket for communicating */
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        csd = SDLNet_TCP_Accept(sd);
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        if (NULL != csd) {
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            DLog(@"Client found");
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            NSDictionary *dictForEngine = [self getDataForEngine];
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            [self sendToEngine:[dictForEngine objectForKey:@"seedCommand"]];
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            [self sendToEngine:[dictForEngine objectForKey:@"templateFilterCommand"]];
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            [self sendToEngine:[dictForEngine objectForKey:@"mapGenCommand"]];
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            [self sendToEngine:[dictForEngine objectForKey:@"mazeSizeCommand"]];
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            [self sendToEngine:@"!"];
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            memset(packedMap, 0, 128*32);
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            SDLNet_TCP_Recv(csd, packedMap, 128*32);
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            SDLNet_TCP_Recv(csd, &maxHogs, sizeof(uint8_t));
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            SDLNet_TCP_Close(csd);
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            serverQuit = YES;
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        }
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    }
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    [HWUtils freePort:self.port];
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    SDLNet_TCP_Close(sd);
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    SDLNet_Quit();
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    // spread the packed bits in an array of bytes (one pixel per element, 0= transparent 1= color)
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    int k = 0;
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    memset(unpackedMap, 255, 128*32*8);     // 255 is white
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    for (int i = 0; i < 32*128; i++) {
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        for (int j = 7; j >= 0; j--) {
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            if (((packedMap[i] >> j) & 0x01) != 0)
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                unpackedMap[k] = 170;       // level of gray [0-255]
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            k++;
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        }
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    }
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    return;
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}
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- (void)drawingThread {
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    @autoreleasepool {
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    uint8_t unpackedMap[128*32*8];
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    [self engineProtocol:unpackedMap];
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    // http://developer.apple.com/mac/library/qa/qa2001/qa1037.html
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    CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceGray();
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    CGContextRef bitmapImage = CGBitmapContextCreate(unpackedMap, 256, 128, 8, 256, colorspace, (CGBitmapInfo)kCGImageAlphaNone);
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    CGColorSpaceRelease(colorspace);
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    CGImageRef previewCGImage = CGBitmapContextCreateImage(bitmapImage);
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    CGContextRelease(bitmapImage);
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    UIImage *previewImage = [[UIImage alloc] initWithCGImage:previewCGImage];
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    CGImageRelease(previewCGImage);
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    // all these are performed on the main thread to prevent a leak
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    [self performSelectorOnMainThread:@selector(setImageRounded:)
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                           withObject:previewImage
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                        waitUntilDone:NO];
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    [self performSelectorOnMainThread:@selector(setLabelText:)
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                           withObject:[NSString stringWithFormat:@"%ld", (long)maxHogs]
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                        waitUntilDone:NO];
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    [self performSelectorOnMainThread:@selector(turnOnWidgets)
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                           withObject:nil
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                        waitUntilDone:NO];
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    [self performSelectorOnMainThread:@selector(removeIndicator)
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                           withObject:nil
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                        waitUntilDone:NO];
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    }
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}
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- (void)updatePreviewWithSeed:(NSString *)seed {
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    // remove the current preview and title
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    [self setImage:nil forState:UIControlStateNormal];
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    [self setTitle:nil forState:UIControlStateNormal];
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    // don't display preview on slower device, too slow and memory hog
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    if (IS_NOT_POWERFUL([HWUtils modelType])) {
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        [self setTitle:NSLocalizedString(@"Preview not available",@"") forState:UIControlStateNormal];
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        [self turnOnWidgets];
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    } else {
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        // add a very nice spinning wheel
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        UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc]
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                                              initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
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        indicator.center = CGPointMake(self.bounds.size.width / 2, self.bounds.size.height / 2);
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        indicator.tag = INDICATOR_TAG;
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        [indicator startAnimating];
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        [self addSubview:indicator];
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        // let's draw in a separate thread so the gui can work; at the end it restore other widgets
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        [NSThread detachNewThreadSelector:@selector(drawingThread) toTarget:self withObject:nil];
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    }
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}
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- (void)updatePreviewWithFile:(NSString *)filePath {
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    UIImage *image = [[UIImage alloc] initWithContentsOfFile:filePath];
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    [self setImageRounded:image forState:UIControlStateNormal];
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    self.backgroundColor = [UIColor whiteColor];
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    self.layer.cornerRadius = 12;
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}
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- (void)removeIndicator {
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    UIActivityIndicatorView *indicator = (UIActivityIndicatorView *)[self viewWithTag:INDICATOR_TAG];
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    if (indicator) {
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        [indicator stopAnimating];
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        [indicator removeFromSuperview];
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    }
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}
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#pragma mark -
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#pragma mark delegate
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- (void)turnOnWidgets {
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    if ([self.delegate respondsToSelector:@selector(turnOnWidgets)])
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        [self.delegate turnOnWidgets];
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}
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- (void)setLabelText:(NSString *)string {
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    if ([self.delegate respondsToSelector:@selector(setMaxLabelText:)])
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        [self.delegate setMaxLabelText:string];
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}
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- (NSDictionary *)getDataForEngine {
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    if ([self.delegate respondsToSelector:@selector(getDataForEngine)])
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        return [self.delegate getDataForEngine];
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    return nil;
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}
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@end