/*

File: MainViewController.m

Abstract: View controller for the interface. Manages the filtered image view and list of filters.

Version: 1.0

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*/

#import "MainViewController.h"

@implementation MainViewController

@synthesize filtersToApply = _filtersToApply;

@synthesize imageView = _imageView;

@synthesize tableView = _tableView;

//

// Action sent by the right navigation bar item.

// Removes all applied filters and updates the display.

- (IBAction)clearFilters:(id)sender

{

[_filtersToApply removeAllObjects];

// Instruct the filtered image view to refresh

[_imageView reloadData];

// Instruct the table to refresh. This will remove

// any checkmarks next to selected filters.

[_tableView reloadData];

}

//

// Private method to add a filter given it's name.

// Creates a new instance of the named filter and adds

// it to the list of filters to be applied, then

// updates the display.

- (void)addFilter:(NSString*)name

{

// Create a new filter with the given name.

CIFilter *newFilter = [CIFilter filterWithName:name];

// A nil value implies the filter is not available.

if (!newFilter) return;

// -setDefaults instructs the filter to configure its parameters

// with their specified default values.

[newFilter setDefaults];

// Our filter configuration method will attempt to configure the

// filter with random values.

[MainViewController configureFilter:newFilter];

[_filtersToApply addObject:newFilter];

// Instruct the filtered image view to refresh

[_imageView reloadData];

}

//

// Private method to add a filter given it's name.

// Updates the display when finished.

- (void)removeFilter:(NSString*)name

{

NSUInteger filterIndex = NSNotFound;

// Find the index named filter in the array.

for (CIFilter *filter in _filtersToApply)

if ([filter.name isEqualToString:name])

filterIndex = [_filtersToApply indexOfObject:filter];

// If it was found (which it always should be) remove it.

if (filterIndex != NSNotFound)

[_filtersToApply removeObjectAtIndex:filterIndex];

// Instruct the filtered image view to refresh

[_imageView reloadData];

}

#pragma mark - TableView

// Standard table view datasource/delegate code.

//

// Create a table view displaying all the filters named in the _availableFilters array.

// Only the names of the filters a stored in the _availableFilters array, the actual filter

// is created on demand when the user chooses to add it to the list of applied filters.

//

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

{

return 1;

}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

{

return [_availableFilters count];

}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

static NSString *filterCellID = @"filterCell";

UITableViewCell *cell;

cell = [tableView dequeueReusableCellWithIdentifier:filterCellID];

if(!cell)

cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:filterCellID];

cell.textLabel.text = [_availableFilters objectAtIndex:indexPath.row];

// Check if the filter named in this row is currently applied to the image. If it is,

// give this row a checkmark.

cell.accessoryType = UITableViewCellAccessoryNone;

for (CIFilter *filter in _filtersToApply)

if ([[filter name] isEqualToString:[_availableFilters objectAtIndex:indexPath.row]])

cell.accessoryType = UITableViewCellAccessoryCheckmark;

return cell;

}

- (NSString*)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section

{

return @"Select a Filter";

}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

{

UITableViewCell *selectedCell = [tableView cellForRowAtIndexPath:indexPath];

// Determine if the filter is or is not currently applied.

BOOL filterIsCurrentlyApplied = NO;

for (CIFilter *filter in _filtersToApply)

if ([[filter name] isEqualToString:selectedCell.textLabel.text])

filterIsCurrentlyApplied = YES;

// If the filter is currently being applied, remove it.

if (filterIsCurrentlyApplied) {

[self removeFilter:[_availableFilters objectAtIndex:indexPath.row]];

[tableView cellForRowAtIndexPath:indexPath].accessoryType = UITableViewCellAccessoryNone;

}

// Otherwise, add it.

else {

[self addFilter:[_availableFilters objectAtIndex:indexPath.row]];

[tableView cellForRowAtIndexPath:indexPath].accessoryType = UITableViewCellAccessoryCheckmark;

}

[tableView deselectRowAtIndexPath:indexPath animated:YES];

}

#pragma mark - View lifecycle

- (void)viewDidLoad

{

[super viewDidLoad];

_filtersToApply = [[NSMutableArray alloc] init];

_imageView.inputImage = [UIImage imageNamed:@"LakeDonPedro2.jpg"];

}

- (void)awakeFromNib

{

_availableFilters = [NSArray arrayWithObjects:@"CIColorInvert", @"CIColorControls", @"CIGammaAdjust", @"CIHueAdjust", nil];

}

@end