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AGEmojiKeyBoardView.m
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AGEmojiKeyBoardView.m
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//
// AGEmojiKeyboardView.m
// AGEmojiKeyboard
//
// Created by Ayush on 09/05/13.
// Copyright (c) 2013 Ayush. All rights reserved.
//
#import "AGEmojiKeyBoardView.h"
#import "AGEmojiPageView.h"
static const CGFloat ButtonWidth = 45;
static const CGFloat ButtonHeight = 37;
static const NSUInteger DefaultRecentEmojisMaintainedCount = 50;
static NSString *const segmentRecentName = @"Recent";
NSString *const RecentUsedEmojiCharactersKey = @"RecentUsedEmojiCharactersKey";
@interface AGEmojiKeyboardView () <UIScrollViewDelegate, AGEmojiPageViewDelegate>
@property (nonatomic) UISegmentedControl *segmentsBar;
@property (nonatomic) UIPageControl *pageControl;
@property (nonatomic) UIScrollView *emojiPagesScrollView;
@property (nonatomic) NSDictionary *emojis;
@property (nonatomic) NSMutableArray *pageViews;
@property (nonatomic) NSString *category;
@end
@implementation AGEmojiKeyboardView
- (NSDictionary *)emojis {
if (!_emojis) {
NSBundle *selfBundle = [NSBundle bundleForClass:[self class]];
NSString *plistPath = [selfBundle pathForResource:@"EmojisList"
ofType:@"plist"];
_emojis = [[NSDictionary dictionaryWithContentsOfFile:plistPath] copy];
}
return _emojis;
}
- (NSString *)categoryNameAtIndex:(NSUInteger)index {
NSArray *categoryList = @[segmentRecentName, @"People", @"Objects", @"Nature", @"Places", @"Symbols"];
return categoryList[index];
}
- (AGEmojiKeyboardViewCategoryImage)defaultSelectedCategory {
if ([self.dataSource respondsToSelector:@selector(defaultCategoryForEmojiKeyboardView:)]) {
return [self.dataSource defaultCategoryForEmojiKeyboardView:self];
}
return AGEmojiKeyboardViewCategoryImageRecent;
}
- (NSUInteger)recentEmojisMaintainedCount {
if ([self.dataSource respondsToSelector:@selector(recentEmojisMaintainedCountForEmojiKeyboardView:)]) {
return [self.dataSource recentEmojisMaintainedCountForEmojiKeyboardView:self];
}
return DefaultRecentEmojisMaintainedCount;
}
- (NSArray *)imagesForSelectedSegments {
static NSMutableArray *array;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
array = [NSMutableArray array];
for (AGEmojiKeyboardViewCategoryImage i = AGEmojiKeyboardViewCategoryImageRecent;
i <= AGEmojiKeyboardViewCategoryImageCharacters;
++i) {
[array addObject:[self.dataSource emojiKeyboardView:self imageForSelectedCategory:i]];
}
});
return array;
}
- (NSArray *)imagesForNonSelectedSegments {
static NSMutableArray *array;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
array = [NSMutableArray array];
for (AGEmojiKeyboardViewCategoryImage i = AGEmojiKeyboardViewCategoryImageRecent;
i <= AGEmojiKeyboardViewCategoryImageCharacters;
++i) {
[array addObject:[self.dataSource emojiKeyboardView:self imageForNonSelectedCategory:i]];
}
});
return array;
}
// recent emojis are backed in NSUserDefaults to save them across app restarts.
- (NSMutableArray *)recentEmojis {
NSArray *emojis = [[NSUserDefaults standardUserDefaults] arrayForKey:RecentUsedEmojiCharactersKey];
NSMutableArray *recentEmojis = [emojis mutableCopy];
if (recentEmojis == nil) {
recentEmojis = [NSMutableArray array];
}
return recentEmojis;
}
- (void)setRecentEmojis:(NSMutableArray *)recentEmojis {
// remove emojis if they cross the cache maintained limit
if ([recentEmojis count] > self.recentEmojisMaintainedCount) {
NSRange indexRange = NSMakeRange(self.recentEmojisMaintainedCount,
[recentEmojis count] - self.recentEmojisMaintainedCount);
NSIndexSet *indexesToBeRemoved = [NSIndexSet indexSetWithIndexesInRange:indexRange];
[recentEmojis removeObjectsAtIndexes:indexesToBeRemoved];
}
[[NSUserDefaults standardUserDefaults] setObject:recentEmojis forKey:RecentUsedEmojiCharactersKey];
}
- (instancetype)initWithFrame:(CGRect)frame dataSource:(id<AGEmojiKeyboardViewDataSource>)dataSource {
self = [super initWithFrame:frame];
if (self) {
// initialize category
_dataSource = dataSource;
self.category = [self categoryNameAtIndex:self.defaultSelectedCategory];
self.segmentsBar = [[UISegmentedControl alloc] initWithItems:self.imagesForSelectedSegments];
self.segmentsBar.frame = CGRectMake(0,
0,
CGRectGetWidth(self.bounds),
CGRectGetHeight(self.segmentsBar.bounds));
self.segmentsBar.autoresizingMask = UIViewAutoresizingFlexibleWidth;
[self.segmentsBar addTarget:self
action:@selector(categoryChangedViaSegmentsBar:)
forControlEvents:UIControlEventValueChanged];
[self setSelectedCategoryImageInSegmentControl:self.segmentsBar
atIndex:self.defaultSelectedCategory];
self.segmentsBar.selectedSegmentIndex = self.defaultSelectedCategory;
[self addSubview:self.segmentsBar];
self.pageControl = [[UIPageControl alloc] init];
self.pageControl.hidesForSinglePage = YES;
self.pageControl.currentPage = 0;
self.pageControl.backgroundColor = [UIColor clearColor];
CGSize pageControlSize = [self.pageControl sizeForNumberOfPages:3];
CGSize frameSize = CGSizeMake(CGRectGetWidth(self.bounds),
CGRectGetHeight(self.bounds) - CGRectGetHeight(self.segmentsBar.bounds) - pageControlSize.height);
NSUInteger numberOfPages = [self numberOfPagesForCategory:self.category
inFrameSize:frameSize];
self.pageControl.numberOfPages = numberOfPages;
pageControlSize = [self.pageControl sizeForNumberOfPages:numberOfPages];
CGRect pageControlFrame = CGRectMake((CGRectGetWidth(self.bounds) - pageControlSize.width) / 2,
CGRectGetHeight(self.bounds) - pageControlSize.height,
pageControlSize.width,
pageControlSize.height);
self.pageControl.frame = CGRectIntegral(pageControlFrame);
[self.pageControl addTarget:self
action:@selector(pageControlTouched:)
forControlEvents:UIControlEventValueChanged];
[self addSubview:self.pageControl];
CGRect scrollViewFrame = CGRectMake(0,
CGRectGetHeight(self.segmentsBar.bounds),
CGRectGetWidth(self.bounds),
CGRectGetHeight(self.bounds) - CGRectGetHeight(self.segmentsBar.bounds) - pageControlSize.height);
self.emojiPagesScrollView = [[UIScrollView alloc] initWithFrame:scrollViewFrame];
self.emojiPagesScrollView.pagingEnabled = YES;
self.emojiPagesScrollView.showsHorizontalScrollIndicator = NO;
self.emojiPagesScrollView.showsVerticalScrollIndicator = NO;
self.emojiPagesScrollView.delegate = self;
[self addSubview:self.emojiPagesScrollView];
}
return self;
}
- (void)layoutSubviews {
CGSize pageControlSize = [self.pageControl sizeForNumberOfPages:3];
NSUInteger numberOfPages = [self numberOfPagesForCategory:self.category
inFrameSize:CGSizeMake(CGRectGetWidth(self.bounds), CGRectGetHeight(self.bounds) - CGRectGetHeight(self.segmentsBar.bounds) - pageControlSize.height)];
NSInteger currentPage = (self.pageControl.currentPage > numberOfPages) ? numberOfPages : self.pageControl.currentPage;
// if (currentPage > numberOfPages) it is set implicitly to max pageNumber available
self.pageControl.numberOfPages = numberOfPages;
pageControlSize = [self.pageControl sizeForNumberOfPages:numberOfPages];
CGRect pageControlFrame = CGRectMake((CGRectGetWidth(self.bounds) - pageControlSize.width) / 2,
CGRectGetHeight(self.bounds) - pageControlSize.height,
pageControlSize.width,
pageControlSize.height);
self.pageControl.frame = CGRectIntegral(pageControlFrame);
self.emojiPagesScrollView.frame = CGRectMake(0,
CGRectGetHeight(self.segmentsBar.bounds),
CGRectGetWidth(self.bounds),
CGRectGetHeight(self.bounds) - CGRectGetHeight(self.segmentsBar.bounds) - pageControlSize.height);
[self.emojiPagesScrollView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
self.emojiPagesScrollView.contentOffset = CGPointMake(CGRectGetWidth(self.emojiPagesScrollView.bounds) * currentPage, 0);
self.emojiPagesScrollView.contentSize = CGSizeMake(CGRectGetWidth(self.emojiPagesScrollView.bounds) * numberOfPages,
CGRectGetHeight(self.emojiPagesScrollView.bounds));
[self purgePageViews];
self.pageViews = [NSMutableArray array];
[self setPage:currentPage];
}
#pragma mark event handlers
- (void)setSelectedCategoryImageInSegmentControl:(UISegmentedControl *)segmentsBar
atIndex:(NSInteger)index {
for (int i=0; i < self.segmentsBar.numberOfSegments; ++i) {
[segmentsBar setImage:self.imagesForNonSelectedSegments[i] forSegmentAtIndex:i];
}
[segmentsBar setImage:self.imagesForSelectedSegments[index] forSegmentAtIndex:index];
}
- (void)categoryChangedViaSegmentsBar:(UISegmentedControl *)sender {
// recalculate number of pages for new category and recreate emoji pages
self.category = [self categoryNameAtIndex:sender.selectedSegmentIndex];
[self setSelectedCategoryImageInSegmentControl:sender
atIndex:sender.selectedSegmentIndex];
self.pageControl.currentPage = 0;
[self setNeedsLayout];
}
- (void)pageControlTouched:(UIPageControl *)sender {
CGRect bounds = self.emojiPagesScrollView.bounds;
bounds.origin.x = CGRectGetWidth(bounds) * sender.currentPage;
bounds.origin.y = 0;
// scrollViewDidScroll is called here. Page set at that time.
[self.emojiPagesScrollView scrollRectToVisible:bounds animated:YES];
}
// Track the contentOffset of the scroll view, and when it passes the mid
// point of the current view’s width, the views are reconfigured.
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
CGFloat pageWidth = CGRectGetWidth(scrollView.frame);
NSInteger newPageNumber = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
if (self.pageControl.currentPage == newPageNumber) {
return;
}
self.pageControl.currentPage = newPageNumber;
[self setPage:self.pageControl.currentPage];
}
#pragma mark change a page on scrollView
// Check if setting pageView for an index is required
- (BOOL)requireToSetPageViewForIndex:(NSUInteger)index {
if (index >= self.pageControl.numberOfPages) {
return NO;
}
for (AGEmojiPageView *page in self.pageViews) {
if ((page.frame.origin.x / CGRectGetWidth(self.emojiPagesScrollView.bounds)) == index) {
return NO;
}
}
return YES;
}
// Create a pageView and add it to the scroll view.
- (AGEmojiPageView *)synthesizeEmojiPageView {
NSUInteger rows = [self numberOfRowsForFrameSize:self.emojiPagesScrollView.bounds.size];
NSUInteger columns = [self numberOfColumnsForFrameSize:self.emojiPagesScrollView.bounds.size];
CGRect pageViewFrame = CGRectMake(0,
0,
CGRectGetWidth(self.emojiPagesScrollView.bounds),
CGRectGetHeight(self.emojiPagesScrollView.bounds));
AGEmojiPageView *pageView = [[AGEmojiPageView alloc] initWithFrame: pageViewFrame
backSpaceButtonImage:[self.dataSource backSpaceButtonImageForEmojiKeyboardView:self]
buttonSize:CGSizeMake(ButtonWidth, ButtonHeight)
rows:rows
columns:columns];
pageView.delegate = self;
[self.pageViews addObject:pageView];
[self.emojiPagesScrollView addSubview:pageView];
return pageView;
}
// return a pageView that can be used in the current scrollView.
// look for an available pageView in current pageView-s on scrollView.
// If all are in use i.e. are of current page or neighbours
// of current page, we create a new one
- (AGEmojiPageView *)usableEmojiPageView {
AGEmojiPageView *pageView = nil;
for (AGEmojiPageView *page in self.pageViews) {
NSUInteger pageNumber = page.frame.origin.x / CGRectGetWidth(self.emojiPagesScrollView.bounds);
if (abs((int)(pageNumber - self.pageControl.currentPage)) > 1) {
pageView = page;
break;
}
}
if (!pageView) {
pageView = [self synthesizeEmojiPageView];
}
return pageView;
}
// Set emoji page view for given index.
- (void)setEmojiPageViewInScrollView:(UIScrollView *)scrollView atIndex:(NSUInteger)index {
if (![self requireToSetPageViewForIndex:index]) {
return;
}
AGEmojiPageView *pageView = [self usableEmojiPageView];
NSUInteger rows = [self numberOfRowsForFrameSize:scrollView.bounds.size];
NSUInteger columns = [self numberOfColumnsForFrameSize:scrollView.bounds.size];
NSUInteger startingIndex = index * (rows * columns - 1);
NSUInteger endingIndex = (index + 1) * (rows * columns - 1);
NSMutableArray *buttonTexts = [self emojiTextsForCategory:self.category
fromIndex:startingIndex
toIndex:endingIndex];
[pageView setButtonTexts:buttonTexts];
pageView.frame = CGRectMake(index * CGRectGetWidth(scrollView.bounds),
0,
CGRectGetWidth(scrollView.bounds),
CGRectGetHeight(scrollView.bounds));
}
// Set the current page.
// sets neightbouring pages too, as they are viewable by part scrolling.
- (void)setPage:(NSInteger)page {
[self setEmojiPageViewInScrollView:self.emojiPagesScrollView atIndex:page - 1];
[self setEmojiPageViewInScrollView:self.emojiPagesScrollView atIndex:page];
[self setEmojiPageViewInScrollView:self.emojiPagesScrollView atIndex:page + 1];
}
- (void)purgePageViews {
for (AGEmojiPageView *page in self.pageViews) {
page.delegate = nil;
}
self.pageViews = nil;
}
#pragma mark data methods
- (NSUInteger)numberOfColumnsForFrameSize:(CGSize)frameSize {
return (NSUInteger)floor(frameSize.width / ButtonWidth);
}
- (NSUInteger)numberOfRowsForFrameSize:(CGSize)frameSize {
return (NSUInteger)floor(frameSize.height / ButtonHeight);
}
- (NSArray *)emojiListForCategory:(NSString *)category {
if ([category isEqualToString:segmentRecentName]) {
return [self recentEmojis];
}
return [self.emojis objectForKey:category];
}
// for a given frame size of scroll view, return the number of pages
// required to show all the emojis for a category
- (NSUInteger)numberOfPagesForCategory:(NSString *)category inFrameSize:(CGSize)frameSize {
if ([category isEqualToString:segmentRecentName]) {
return 1;
}
NSUInteger emojiCount = [[self emojiListForCategory:category] count];
NSUInteger numberOfRows = [self numberOfRowsForFrameSize:frameSize];
NSUInteger numberOfColumns = [self numberOfColumnsForFrameSize:frameSize];
NSUInteger numberOfEmojisOnAPage = (numberOfRows * numberOfColumns) - 1;
NSUInteger numberOfPages = (NSUInteger)ceil((float)emojiCount / numberOfEmojisOnAPage);
return numberOfPages;
}
// return the emojis for a category, given a staring and an ending index
- (NSMutableArray *)emojiTextsForCategory:(NSString *)category
fromIndex:(NSUInteger)start
toIndex:(NSUInteger)end {
NSArray *emojis = [self emojiListForCategory:category];
end = ([emojis count] > end)? end : [emojis count];
NSIndexSet *index = [[NSIndexSet alloc] initWithIndexesInRange:NSMakeRange(start, end-start)];
return [[emojis objectsAtIndexes:index] mutableCopy];
}
#pragma mark EmojiPageViewDelegate
- (void)setInRecentsEmoji:(NSString *)emoji {
NSAssert(emoji != nil, @"Emoji can't be nil");
NSMutableArray *recentEmojis = [self recentEmojis];
for (int i = 0; i < [recentEmojis count]; ++i) {
if ([recentEmojis[i] isEqualToString:emoji]) {
[recentEmojis removeObjectAtIndex:i];
}
}
[recentEmojis insertObject:emoji atIndex:0];
[self setRecentEmojis:recentEmojis];
}
// add the emoji to recents
- (void)emojiPageView:(AGEmojiPageView *)emojiPageView didUseEmoji:(NSString *)emoji {
[self setInRecentsEmoji:emoji];
[self.delegate emojiKeyBoardView:self didUseEmoji:emoji];
}
- (void)emojiPageViewDidPressBackSpace:(AGEmojiPageView *)emojiPageView {
[self.delegate emojiKeyBoardViewDidPressBackSpace:self];
}
@end