EditorSelectionController.m

/*
 Generic controller to select a single item from a list of options
 
 Copyright 2013 Thincast Technologies GmbH, Author: Martin Fleisz
 
 This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
 If a copy of the MPL was not distributed with this file, You can obtain one at
 http://mozilla.org/MPL/2.0/.
 */
 
#import "EditorSelectionController.h"
#import "ConnectionParams.h"
#import "OrderedDictionary.h"
 
@interface EditorSelectionController (Private)
- (OrderedDictionary *)selectionForIndex:(int)index;
@end
 
@implementation EditorSelectionController
 
- (id)initWithConnectionParams:(ConnectionParams *)params
                       entries:(NSArray *)entries
                    selections:(NSArray *)selections
{
  self = [super initWithStyle:UITableViewStyleGrouped];
  if (self)
  {
    _params = [params retain];
    _entries = [entries retain];
    _selections = [selections retain];
 
    // allocate and init current selections array
    _cur_selections = [[NSMutableArray alloc] initWithCapacity:[_entries count]];
    for (int i = 0; i < [entries count]; ++i)
    {
      NSString *entry = [entries objectAtIndex:i];
      if ([_params hasValueForKeyPath:entry])
      {
        NSUInteger idx = [(OrderedDictionary *)[selections objectAtIndex:i]
            indexForValue:[NSNumber numberWithInt:[_params intForKeyPath:entry]]];
        [_cur_selections addObject:[NSNumber numberWithInt:(idx != NSNotFound ? idx : 0)]];
      }
      else
        [_cur_selections addObject:[NSNumber numberWithInt:0]];
    }
  }
  return self;
}
 
- (void)didReceiveMemoryWarning
{
  // Releases the view if it doesn't have a superview.
  [super didReceiveMemoryWarning];
 
  // Release any cached data, images, etc that aren't in use.
  [_params autorelease];
  [_entries autorelease];
  [_selections autorelease];
  [_cur_selections autorelease];
}
 
#pragma mark - View lifecycle
 
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
  // Return YES for supported orientations
  return YES;
}
 
#pragma mark - Table view data source
 
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
  // Return the number of sections.
  return [_entries count];
}
 
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
  // Return the number of rows in the section.
  return [[self selectionForIndex:section] count];
}
 
- (UITableViewCell *)tableView:(UITableView *)tableView
         cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
  UITableViewCell *cell = [self tableViewCellFromIdentifier:TableCellIdentifierMultiChoice];
 
  // get selection
  OrderedDictionary *selection = [self selectionForIndex:[indexPath section]];
 
  // set cell properties
  [[cell textLabel] setText:[selection keyAtIndex:[indexPath row]]];
 
  // set default checkmark
  if ([indexPath row] == [[_cur_selections objectAtIndex:[indexPath section]] intValue])
    [cell setAccessoryType:UITableViewCellAccessoryCheckmark];
  else
    [cell setAccessoryType:UITableViewCellAccessoryNone];
 
  return cell;
}
 
#pragma mark - Table view delegate
 
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
  // has selection change?
  int cur_selection = [[_cur_selections objectAtIndex:[indexPath section]] intValue];
  if ([indexPath row] != cur_selection)
  {
    [tableView deselectRowAtIndexPath:indexPath animated:NO];
 
    NSIndexPath *oldIndexPath = [NSIndexPath indexPathForRow:cur_selection
                                                   inSection:[indexPath section]];
 
    // clear old checkmark
    UITableViewCell *old_sel_cell = [tableView cellForRowAtIndexPath:oldIndexPath];
    old_sel_cell.accessoryType = UITableViewCellAccessoryNone;
 
    // set new checkmark
    UITableViewCell *new_sel_cell = [tableView cellForRowAtIndexPath:indexPath];
    new_sel_cell.accessoryType = UITableViewCellAccessoryCheckmark;
 
    // get value from selection dictionary
    OrderedDictionary *dict = [self selectionForIndex:[indexPath section]];
    int sel_value = [[dict valueForKey:[dict keyAtIndex:[indexPath row]]] intValue];
 
    // update selection index and params value
    [_cur_selections replaceObjectAtIndex:[indexPath section]
                               withObject:[NSNumber numberWithInt:[indexPath row]]];
    [_params setInt:sel_value forKeyPath:[_entries objectAtIndex:[indexPath section]]];
  }
}
 
#pragma mark - Convenience functions
 
- (OrderedDictionary *)selectionForIndex:(int)index
{
  return (OrderedDictionary *)[_selections objectAtIndex:index];
}
 
@end