project_files/HedgewarsMobile/Classes/EditableCellView.m
author koda
Sat, 13 Nov 2010 01:24:39 +0100
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permissions -rw-r--r--
some interface tricks for iphone as well
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/*
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 * Hedgewars-iOS, a Hedgewars port for iOS devices
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 * Copyright (c) 2009-2010 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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 *
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 * File created on 03/07/2010.
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 */
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#import "EditableCellView.h"
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#import "CommodityFunctions.h"
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@implementation EditableCellView
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@synthesize delegate, textField, titleLabel, minimumCharacters, maximumCharacters, respectEditing, oldValue;
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-(id) initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
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    if ((self = [super initWithStyle:style reuseIdentifier:reuseIdentifier])) {
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        delegate = nil;
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        textField = [[UITextField alloc] initWithFrame:CGRectZero];
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        textField.backgroundColor = [UIColor clearColor];
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        textField.delegate = self;
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        textField.clearButtonMode = UITextFieldViewModeWhileEditing;
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        textField.clearsOnBeginEditing = NO;
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        textField.returnKeyType = UIReturnKeyDone;
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        textField.adjustsFontSizeToFitWidth = YES;
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        textField.userInteractionEnabled = YES;
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        textField.font = [UIFont boldSystemFontOfSize:[UIFont labelFontSize]];
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        [textField addTarget:self action:@selector(save:) forControlEvents:UIControlEventEditingDidEndOnExit];
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        [self.contentView addSubview:textField];
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        //[textField release];
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        titleLabel = [[UILabel alloc] init];
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        titleLabel.textAlignment = UITextAlignmentLeft;
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        titleLabel.backgroundColor = [UIColor clearColor];
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        titleLabel.font = [UIFont boldSystemFontOfSize:[UIFont labelFontSize]];
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        [self.contentView addSubview:titleLabel];
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        //[titleLabel release];
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        minimumCharacters = 1;
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        maximumCharacters = 64;
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        respectEditing = NO;
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        oldValue = nil;
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    }
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    return self;
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}
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-(void) layoutSubviews {
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    [super layoutSubviews];
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    CGRect contentRect = self.contentView.bounds;
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    CGFloat boundsX = contentRect.origin.x;
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    int offset = 0;
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    int skew = 0;
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    if (self.imageView != nil)
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        offset += self.imageView.frame.size.width;
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    if ([self.titleLabel.text length] == 0)
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        titleLabel.frame = CGRectZero;
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    else {
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        titleLabel.frame = CGRectMake(boundsX+offset+10, 10, 100, [UIFont labelFontSize] + 4);
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        offset += 100;
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        skew +=2;
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    }
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    textField.frame = CGRectMake(boundsX+offset+10, skew+10, 300, [UIFont labelFontSize] + 4);
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}
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-(void) setSelected:(BOOL)selected animated:(BOOL)animated {
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    [super setSelected:selected animated:animated];
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    // Configure the view for the selected state
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}
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-(void) dealloc {
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    self.delegate = nil;
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    releaseAndNil(oldValue);
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    releaseAndNil(titleLabel);
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    releaseAndNil(textField);
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    [super dealloc];
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}
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#pragma mark -
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#pragma mark textField delegate
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// limit the size of the field to 64 characters like in original frontend
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-(BOOL) textField:(UITextField *)aTextField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
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    return !([aTextField.text length] > self.maximumCharacters && [string length] > range.length);
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}
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// allow editing only if delegate is set and conformant to protocol, and if editableOnlyWhileEditing
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-(BOOL) textFieldShouldBeginEditing:(UITextField *)aTextField {
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    return (delegate != nil) &&
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           [delegate respondsToSelector:@selector(saveTextFieldValue:withTag:)] &&
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           (respectEditing) ? ((UITableView*)[self superview]).editing : YES;
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}
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// the textfield is being modified, update the navigation controller
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-(void) textFieldDidBeginEditing:(UITextField *)aTextField{
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    // don't interact with table below
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    ((UITableView*)[self superview]).scrollEnabled = NO;
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    self.oldValue = self.textField.text;
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    UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"Cancel",@"")
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                                                                     style:UIBarButtonItemStylePlain
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                                                                    target:self
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                                                                    action:@selector(cancel:)];
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    [(UITableViewController *)delegate navigationItem].leftBarButtonItem = cancelButton;
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    [cancelButton release];
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    UIBarButtonItem *saveButton = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"Save",@"")
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                                                                     style:UIBarButtonItemStyleDone
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                                                                    target:self
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                                                                    action:@selector(save:)];
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    [(UITableViewController *)delegate navigationItem].rightBarButtonItem = saveButton;
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    [saveButton release];
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}
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/* with this a field might remain in editing status even if the view moved;
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   use method below instead that allows some more interaction
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// don't accept 0-length strings
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-(BOOL) textFieldShouldEndEditing:(UITextField *)aTextField {
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    return ([aTextField.text length] > 0);
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}
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*/
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-(BOOL) textFieldShouldReturn:(UITextField *)aTextField {
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    return ([aTextField.text length] >= self.minimumCharacters);
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}
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// the textfield has been modified, tell the delegate to do something
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-(void) textFieldDidEndEditing:(UITextField *)aTextField {
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    // this forces a save when user selects a new field
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    if ([self.textField.text isEqualToString:self.oldValue] == NO)
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        [self save:aTextField];
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    // restores default behaviour on caller
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    ((UITableView*)[self superview]).scrollEnabled = YES;
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    [(UITableViewController *)delegate navigationItem].rightBarButtonItem = [(UITableViewController *)delegate navigationItem].backBarButtonItem;
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    [(UITableViewController *)delegate navigationItem].leftBarButtonItem = nil;
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}
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#pragma mark -
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#pragma mark instance methods
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// the user wants to show the keyboard
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-(void) replyKeyboard {
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    [self.textField becomeFirstResponder];
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}
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// the user pressed cancel so hide keyboard
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-(void) cancel:(id) sender {
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    // reverts any changes and performs a fake save for removing the keyboard
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    self.textField.text = self.oldValue;
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    [self save:sender];
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}
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// send the value to the delegate (called before textFieldDidEndEditing)
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-(void) save:(id) sender {
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    if (delegate == nil || [delegate respondsToSelector:@selector(saveTextFieldValue:withTag:)] == NO)
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        return;
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    // don't save if the textfield is invalid
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    if ([self textFieldShouldReturn:textField] == NO)
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        return;
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    [delegate saveTextFieldValue:self.textField.text withTag:self.tag];
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    [self.textField resignFirstResponder];
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    self.oldValue = nil;
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}
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// when field is editable only when the tableview is editable, resign responder when exiting editing mode
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-(void) willTransitionToState:(UITableViewCellStateMask)state {
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    if (respectEditing && state == UITableViewCellStateDefaultMask)
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        [self save:nil];
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    [super willTransitionToState:state];
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}
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@end