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STKGroup.m
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STKGroup.m
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#import "STKGroup.h"
#import "STKConstants.h"
#import <objc/runtime.h>
#import <UIKit/UIKit.h>
#import <SpringBoard/SpringBoard.h>
NSString * const STKGroupCentralIconKey = @"centralIcon";
NSString * const STKGroupLayoutKey = @"layout";
NSString * const STKGroupCoordinateKey = @"coordinate";
@implementation STKGroup
{
STKGroupLayout *_layout;
STKGroupLayout *_placeholderLayout;
NSHashTable *_observers;
}
- (instancetype)initWithCentralIcon:(SBIcon *)icon layout:(STKGroupLayout *)layout
{
if ((self = [super init])) {
self.centralIcon = icon;
_layout = [layout retain];
[self _commonInit];
}
return self;
}
- (instancetype)initWithDictionary:(NSDictionary *)repr
{
NSParameterAssert([repr allKeys].count > 0);
if ((self = [super init])) {
NSString *iconID = repr[STKGroupCentralIconKey];
self.centralIcon = [(SBIconModel *)[[CLASS(SBIconController) sharedInstance] model] expectedIconForDisplayIdentifier:iconID];
_layout = [[STKGroupLayout alloc] initWithIdentifierDictionary:repr[STKGroupLayoutKey]];
_lastKnownCoordinate = STKCoordinateFromDictionary(repr[STKGroupCoordinateKey]);
[self _commonInit];
}
return self;
}
- (void)_commonInit
{
_observers = [[NSHashTable alloc] initWithOptions:NSHashTableWeakMemory capacity:0];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_editingEnded:) name:STKEditingEndedNotificationName object:nil];
if (!self.empty) {
// Ensure icon images are cached
for (SBIcon *icon in _layout) {
[icon getIconImage:2];
}
}
}
- (void)dealloc
{
[_layout release];
[_placeholderLayout release];
[_observers removeAllObjects];
[_observers release];
[_centralIcon release];
[[NSNotificationCenter defaultCenter] removeObserver:self];
[super dealloc];
}
- (NSString *)description
{
return [NSString stringWithFormat:@"<%@ %p centralIcon: %@ layout: %@ observers: %zd>", [self class], self, _centralIcon.leafIdentifier, _layout, _observers.count];
}
- (NSDictionary *)dictionaryRepresentation
{
return @{
STKGroupCentralIconKey: [self.centralIcon leafIdentifier] ?: @"",
STKGroupLayoutKey: [_layout identifierDictionary] ?: @{},
STKGroupCoordinateKey: STKDictionaryFromCoordinate(_lastKnownCoordinate)
};
}
- (BOOL)hasPlaceholders
{
return !!(_placeholderLayout);
}
- (BOOL)empty
{
return (_state == STKGroupStateEmpty);
}
- (void)relayoutForNewCoordinate:(SBIconCoordinate)coordinate
{
if ((coordinate.row == _lastKnownCoordinate.row && coordinate.col == _lastKnownCoordinate.col)) {
return;
}
_lastKnownCoordinate = coordinate;
[self forceRelayout];
}
- (void)forceRelayout
{
if (_state == STKGroupStateEmpty) {
[_layout release];
_layout = nil;
_layout = [[STKGroupLayoutHandler emptyLayoutForIconAtLocation:[STKGroupLayoutHandler locationForIcon:self.centralIcon]] retain];
}
else {
STKGroupLayout *newLayout = [STKGroupLayoutHandler correctLayoutForGroupIfNecessary:self];
if (newLayout) {
[_layout release];
_layout = [newLayout retain];
}
}
self.centralIcon = [[(SBIconController *)[CLASS(SBIconController) sharedInstance] model] expectedIconForDisplayIdentifier:_centralIcon.leafIdentifier];
// Notify observers irrespective of whether we needed to relayout
[self _enumerateObserversUsingBlock:^(id<STKGroupObserver> obs) {
[obs groupDidRelayout:self];
} forSelector:@selector(groupDidRelayout:)];
}
- (void)replaceIconInSlot:(STKGroupSlot)slot withIcon:(SBIcon *)icon
{
SBIcon *iconToReplace = [[[_layout iconInSlot:slot] retain] autorelease];
[_layout setIcon:icon inSlot:slot];
BOOL iconToAddIsPlaceholder = ![icon isLeafIcon];
if (iconToAddIsPlaceholder) {
[_placeholderLayout addIcon:icon toIconsAtPosition:slot.position];
}
[self _updateState];
[self _enumerateObserversUsingBlock:^(id<STKGroupObserver> obs) {
[obs group:self replacedIcon:iconToReplace inSlot:slot withIcon:icon];
} forSelector:@selector(group:replacedIcon:inSlot:withIcon:)];
}
- (void)removeIconInSlot:(STKGroupSlot)slot
{
SBIcon *removedIcon = [[[_layout iconInSlot:slot] retain] autorelease];
[_layout removeIcon:removedIcon fromIconsAtPosition:slot.position];
_state = STKGroupStateDirty;
[self _enumerateObserversUsingBlock:^(id<STKGroupObserver> obs) {
[obs group:self removedIcon:removedIcon inSlot:slot];
} forSelector:@selector(group:removedIcon:inSlot:)];
}
- (void)addPlaceholders
{
if (_placeholderLayout) {
return;
}
_state = STKGroupStateDirty;
_placeholderLayout = [[STKGroupLayoutHandler placeholderLayoutForGroup:self] retain];
for (STKLayoutPosition pos = STKPositionTop; pos <= STKPositionRight; pos++) {
[_layout addIcons:_placeholderLayout[pos] toIconsAtPosition:pos];
}
[self _enumerateObserversUsingBlock:^(id<STKGroupObserver> obs) {
[obs groupDidAddPlaceholders:self];
} forSelector:@selector(groupDidAddPlaceholders:)];
}
- (void)removePlaceholders
{
if (_state != STKGroupStateDirty) {
return;
}
[self _forceUdpateState];
if (_state == STKGroupStateEmpty) {
[_placeholderLayout release];
_placeholderLayout = nil;
}
[self _enumerateObserversUsingBlock:^(id<STKGroupObserver> obs) {
[obs groupWillRemovePlaceholders:self];
} forSelector:@selector(groupWillRemovePlaceholders:)];
for (STKLayoutPosition pos = STKPositionTop; pos <= STKPositionRight; pos++) {
[_layout removeIcons:_placeholderLayout[pos] fromIconsAtPosition:pos];
}
[_placeholderLayout release];
_placeholderLayout = nil;
[self _enumerateObserversUsingBlock:^(id<STKGroupObserver> obs) {
[obs groupDidRemovePlaceholders:self];
} forSelector:@selector(groupDidRemovePlaceholders:)];
}
- (void)finalizeState
{
if (_state != STKGroupStateDirty) {
STKLog(@"Group state is not dirty, simply notifying observers.");
goto notifyObservers;
}
STKGroupLayout *newLayout = [[STKGroupLayout alloc] init];
// keep only the leaf icons
[_layout enumerateIconsUsingBlockWithIndexes:^(SBIcon *icon, STKLayoutPosition position, NSArray *currentArray, NSUInteger index, BOOL *stop) {
if ([icon isLeafIcon]) {
CLog(@"Finalization: Adding %@ to new layout", icon);
[newLayout addIcon:icon toIconsAtPosition:position];
}
}];
if ([newLayout allIcons].count > 0) {
// move to newLayout only if it has any icons
CLog(@"Finalization: Using new layout");
[_layout release];
_layout = newLayout;
_state = STKGroupStateNormal;
}
else {
// If newLayout doesn't have any icons, we transition to STKGroupStateEmpty!
CLog(@"Finalization: New layout is empty, adjusting state to match");
[newLayout release];
_state = STKGroupStateEmpty;
[self forceRelayout];
}
[_placeholderLayout release];
_placeholderLayout = nil;
notifyObservers:
[self _enumerateObserversUsingBlock:^(id<STKGroupObserver> obs) {
[obs groupDidFinalizeState:self];
} forSelector:@selector(groupDidFinalizeState:)];
}
- (void)_editingEnded:(NSNotification *)notf
{
self.centralIcon = [[(SBIconController *)[CLASS(SBIconController) sharedInstance] model] expectedIconForDisplayIdentifier:_centralIcon.leafIdentifier];
SBIconCoordinate coord = [STKGroupLayoutHandler coordinateForIcon:self.centralIcon];
[self relayoutForNewCoordinate:coord];
}
- (void)addObserver:(id<STKGroupObserver>)observer
{
[_observers addObject:observer];
}
- (void)removeObserver:(id<STKGroupObserver>)observer
{
[_observers removeObject:observer];
}
- (void)_updateState
{
if (_state == STKGroupStateDirty) {
return;
}
[self _forceUdpateState];
}
- (void)_forceUdpateState
{
NSUInteger emptyIconCount = 0;
NSUInteger realIconCount = 0;
for (SBIcon *icon in _layout) {
if (![icon isLeafIcon]) {
emptyIconCount++;
}
else {
realIconCount++;
}
}
if (realIconCount > 0 && emptyIconCount > 0) {
// we need to process the icons to get rid of the empty placeholders
_state = STKGroupStateDirty;
}
else if (realIconCount > 0 && emptyIconCount == 0) {
_state = STKGroupStateNormal;
}
else {
_state = STKGroupStateEmpty;
}
}
- (void)_enumerateObserversUsingBlock:(void(^)(id<STKGroupObserver>))block forSelector:(SEL)sel
{
for (id<STKGroupObserver> obs in [_observers allObjects]) {
if ([obs respondsToSelector:sel]) {
block(obs);
}
}
}
@end