components/Snackbar/examples/SnackbarSuspensionExample.m

// Copyright 2016-present the Material Components for iOS authors. All Rights Reserved.
//
// 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 <UIKit/UIKit.h>

#import "supplemental/SnackbarExampleSupplemental.h"
#import "MDCCollectionViewTextCell.h"
#import "MDCCollectionViewController.h"
#import "MDCSnackbarManager.h"
#import "MDCSnackbarMessage.h"
#import "MDCSemanticColorScheme.h"
#import "MDCTypographyScheme.h"

NS_ASSUME_NONNULL_BEGIN

static NSString *const kCategoryA = @"CategoryA";
static NSString *const kCategoryB = @"CategoryB";

@interface SnackbarSuspensionExample : SnackbarExample

- (void)handleSuspendStateChanged:(UISwitch *)sender;

/** The current suspension token. */
@property(nullable, nonatomic) id<MDCSnackbarSuspensionToken> allMessagesToken;

/** Token held when suspending messages from Group A. */
@property(nullable, nonatomic) id<MDCSnackbarSuspensionToken> groupAToken;

/** Token held when suspending messages from Group B. */
@property(nullable, nonatomic) id<MDCSnackbarSuspensionToken> groupBToken;

@end

@implementation SnackbarSuspensionExample

- (void)viewDidLoad {
  [super viewDidLoad];

  if (!self.colorScheme) {
    self.colorScheme =
        [[MDCSemanticColorScheme alloc] initWithDefaults:MDCColorSchemeDefaultsMaterial201804];
  }
  if (!self.typographyScheme) {
    self.typographyScheme =
        [[MDCTypographyScheme alloc] initWithDefaults:MDCTypographySchemeDefaultsMaterial201804];
  }
  [self setupExampleViews:@[
    @"Show Category A Message", @"Show Category B Message", @"Show Message with no category",
    @"Suspend Category A", @"Suspend Category B", @"Suspend All"
  ]];
  self.title = @"Message Suspension";
}

- (void)showMessageWithPrefix:(NSString *)prefix category:(nullable NSString *)category {
  MDCSnackbarMessage *message = [[MDCSnackbarMessage alloc] init];
  NSMutableAttributedString *attributedMessage = [[NSMutableAttributedString alloc] init];
  NSString *formattedPrefix = [NSString stringWithFormat:@"%@ : ", prefix];
  NSAttributedString *attributedString =
      [[NSAttributedString alloc] initWithString:formattedPrefix
                                      attributes:@{MDCSnackbarMessageBoldAttributeName : @YES}];
  [attributedMessage appendAttributedString:attributedString];

  NSAttributedString *attributedStringID =
      [[NSAttributedString alloc] initWithString:[NSUUID UUID].UUIDString];
  [attributedMessage appendAttributedString:attributedStringID];
  message.attributedText = attributedMessage;
  message.category = category;
  [MDCSnackbarManager.defaultManager showMessage:message];
}

#pragma mark - Suspend/Resume

- (void)setSuspendedGroupA:(BOOL)suspended {
  if (suspended && self.groupAToken == nil) {
    self.groupAToken = [MDCSnackbarManager.defaultManager suspendMessagesWithCategory:kCategoryA];
  } else if (!suspended && self.groupAToken != nil) {
    [MDCSnackbarManager.defaultManager resumeMessagesWithToken:self.groupAToken];
    self.groupAToken = nil;
  }
}

- (void)setSuspendedGroupB:(BOOL)suspended {
  if (suspended && self.groupBToken == nil) {
    self.groupBToken = [MDCSnackbarManager.defaultManager suspendMessagesWithCategory:kCategoryB];
  } else if (!suspended && self.groupBToken != nil) {
    [MDCSnackbarManager.defaultManager resumeMessagesWithToken:self.groupBToken];
    self.groupBToken = nil;
  }
}

- (void)setSuspendedAllMessages:(BOOL)suspended {
  if (suspended && self.allMessagesToken == nil) {
    self.allMessagesToken = [MDCSnackbarManager.defaultManager suspendAllMessages];
  } else if (!suspended && self.allMessagesToken != nil) {
    [MDCSnackbarManager.defaultManager resumeMessagesWithToken:self.allMessagesToken];
    self.allMessagesToken = nil;
  }
}

#pragma mark - Event Handling

- (void)collectionView:(UICollectionView *)collectionView
    didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
  [super collectionView:collectionView didSelectItemAtIndexPath:indexPath];
  switch (indexPath.row) {
    case 0:
      [self showMessageWithPrefix:@"Category A Message" category:kCategoryA];
      break;
    case 1:
      [self showMessageWithPrefix:@"Category B Message" category:kCategoryB];
      break;
    case 2:
      [self showMessageWithPrefix:@"No Category Message" category:nil];
      break;
    case 3: {
      UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
      if ([cell isKindOfClass:[MDCCollectionViewTextCell class]]) {
        MDCCollectionViewTextCell *mdcCell = (MDCCollectionViewTextCell *)cell;
        UIView *accessoryView = mdcCell.accessoryView;
        if ([accessoryView isKindOfClass:[UISwitch class]]) {
          UISwitch *theSwitch = (UISwitch *)accessoryView;
          [theSwitch setOn:!theSwitch.isOn animated:YES];
          cell.accessibilityValue = theSwitch.isOn ? @"on" : @"off";
          cell.accessibilityLabel = mdcCell.textLabel.text;
          [self setSuspendedGroupA:theSwitch.isOn];
        }
      }
      break;
    }
    case 4: {
      UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
      if ([cell isKindOfClass:[MDCCollectionViewTextCell class]]) {
        MDCCollectionViewTextCell *mdcCell = (MDCCollectionViewTextCell *)cell;
        UIView *accessoryView = mdcCell.accessoryView;
        if ([accessoryView isKindOfClass:[UISwitch class]]) {
          UISwitch *theSwitch = (UISwitch *)accessoryView;
          [theSwitch setOn:!theSwitch.isOn animated:YES];
          cell.accessibilityValue = theSwitch.isOn ? @"on" : @"off";
          cell.accessibilityLabel = mdcCell.textLabel.text;
          [self setSuspendedGroupB:theSwitch.isOn];
        }
      }
      break;
    }
    case 5: {
      UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
      if ([cell isKindOfClass:[MDCCollectionViewTextCell class]]) {
        MDCCollectionViewTextCell *mdcCell = (MDCCollectionViewTextCell *)cell;
        UIView *accessoryView = mdcCell.accessoryView;
        if ([accessoryView isKindOfClass:[UISwitch class]]) {
          UISwitch *theSwitch = (UISwitch *)accessoryView;
          [theSwitch setOn:!theSwitch.isOn animated:YES];
          cell.accessibilityValue = theSwitch.isOn ? @"on" : @"off";
          cell.accessibilityLabel = mdcCell.textLabel.text;
          [self setSuspendedAllMessages:theSwitch.isOn];
        }
      }
      break;
    }
    default:
      break;
  }
}

- (void)handleSuspendStateChanged:(UISwitch *)sender {
  BOOL suspended = sender.on;

  // Figure out which token we're dealing with based on which switch sent this message.
  if (sender.tag == 3) {
    [self setSuspendedGroupA:suspended];
  } else if (sender.tag == 4) {
    [self setSuspendedGroupB:suspended];
  } else if (sender.tag == 5) {
    [self setSuspendedAllMessages:suspended];
  }
}

@end

@implementation SnackbarSuspensionExample (CollectionView)

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
                  cellForItemAtIndexPath:(NSIndexPath *)indexPath {
  MDCCollectionViewTextCell *cell =
      [collectionView dequeueReusableCellWithReuseIdentifier:kSnackbarExamplesCellIdentifier
                                                forIndexPath:indexPath];

  cell.textLabel.text = self.choices[indexPath.row];
  cell.isAccessibilityElement = YES;
  cell.accessibilityTraits = cell.accessibilityTraits | UIAccessibilityTraitButton;
  cell.accessibilityLabel = cell.textLabel.text;
  if (indexPath.row > 2) {
    UISwitch *editingSwitch = [[UISwitch alloc] initWithFrame:CGRectZero];
    [editingSwitch setTag:indexPath.row];
    [editingSwitch addTarget:self
                      action:@selector(handleSuspendStateChanged:)
            forControlEvents:UIControlEventValueChanged];
    cell.accessoryView = editingSwitch;
    cell.accessibilityValue = editingSwitch.isOn ? @"on" : @"off";
  } else {
    cell.accessoryView = nil;
    cell.accessibilityValue = nil;
  }

  return cell;
}

@end

@implementation SnackbarSuspensionExample (CatalogByConvention)

+ (NSDictionary *)catalogMetadata {
  return @{
    @"breadcrumbs" : @[ @"Snackbar", @"Snackbar Suspension" ],
    @"primaryDemo" : @NO,
    @"presentable" : @YES,
    @"snapshotDelay" : @1.0,
  };
}

@end

NS_ASSUME_NONNULL_END