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FBGraphObjectTableSelection.m
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FBGraphObjectTableSelection.m
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/*
* Copyright 2012 Facebook
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#import "FBGraphObjectTableSelection.h"
#import "FBUtility.h"
@interface FBGraphObjectTableSelection() <UITableViewDelegate, FBGraphObjectSelectionQueryDelegate>
@property (nonatomic, retain) FBGraphObjectTableDataSource *dataSource;
@property (nonatomic, retain) NSArray *selection;
- (void)selectItem:(FBGraphObject *)item
cell:(UITableViewCell *)cell;
- (void)deselectItem:(FBGraphObject *)item
cell:(UITableViewCell *)cell;
- (void)selectionChanged;
@end
@implementation FBGraphObjectTableSelection
@synthesize dataSource = _dataSource;
@synthesize delegate = _delegate;
@synthesize selection = _selection;
@synthesize allowsMultipleSelection = _allowMultipleSelection;
- (id)initWithDataSource:(FBGraphObjectTableDataSource *)dataSource
{
self = [super init];
if (self) {
dataSource.selectionDelegate = self;
self.dataSource = dataSource;
self.allowsMultipleSelection = YES;
NSArray *selection = [[NSArray alloc] init];
self.selection = selection;
[selection release];
}
return self;
}
- (void)dealloc
{
_dataSource.selectionDelegate = nil;
[_dataSource release];
[_selection release];
[super dealloc];
}
- (void)selectItem:(FBGraphObject *)item
cell:(UITableViewCell *)cell
{
if ([FBUtility graphObjectInArray:self.selection withSameIDAs:item] == nil) {
NSMutableArray *selection = [[NSMutableArray alloc] initWithArray:self.selection];
[selection addObject:item];
self.selection = selection;
[selection release];
}
cell.accessoryType = UITableViewCellAccessoryCheckmark;
[self selectionChanged];
}
- (void)deselectItem:(FBGraphObject *)item
cell:(UITableViewCell *)cell
{
id<FBGraphObject> selectedItem = [FBUtility graphObjectInArray:self.selection withSameIDAs:item];
if (selectedItem) {
NSMutableArray *selection = [[NSMutableArray alloc] initWithArray:self.selection];
[selection removeObject:selectedItem];
self.selection = selection;
[selection release];
}
cell.accessoryType = UITableViewCellAccessoryNone;
[self selectionChanged];
}
- (void)selectionChanged
{
if ([self.delegate respondsToSelector:
@selector(graphObjectTableSelectionDidChange:)]) {
[self.delegate graphObjectTableSelectionDidChange:self];
}
}
- (BOOL)selectionIncludesItem:(id<FBGraphObject>)item
{
return [FBUtility graphObjectInArray:self.selection withSameIDAs:item] != nil;
}
#pragma mark - FBGraphObjectSelectionDelegate
- (BOOL)graphObjectTableDataSource:(FBGraphObjectTableDataSource *)dataSource
selectionIncludesItem:(id<FBGraphObject>)item
{
return [self selectionIncludesItem:item];
}
#pragma mark - UITableViewDelegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
// cell may be nil, which is okay, it will pick up the right selected state when it is created.
FBGraphObject *item = [self.dataSource itemAtIndexPath:indexPath];
// We want to support multi-select on iOS <5.0, so rather than rely on the table view's notion
// of selection, just treat this as a toggle. If it is already selected, deselect it, and vice versa.
// Note: we only care about allowMultipleSelection in didDeselect, as that's what has to worry about
// de-selecting the previously-selected item, if any.
if (![self selectionIncludesItem:item]) {
[self selectItem:item cell:cell];
} else {
[self deselectItem:item cell:cell];
}
}
- (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath
{
if (self.allowsMultipleSelection == NO) {
// Only deselect if we are not allowing multi select. Otherwise, the user will manually
// deselect this item by clicking on it again.
// cell may be nil, which is okay, it will pick up the right selected state when it is created.
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
NSLog(@"didDeselect: indexPath = %@", indexPath.description);
FBGraphObject *item = [self.dataSource itemAtIndexPath:indexPath];
[self deselectItem:item cell:cell];
}
}
@end