Permalink
Switch branches/tags
Nothing to show
Find file
Fetching contributors…
Cannot retrieve contributors at this time
88 lines (68 sloc) 2.32 KB
// MDCStateContext.m
//
// Copyright (c) 2012 modocache
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#import "MDCStateContext.h"
@interface MDCStateContext ()
@property (nonatomic, strong) MDCState *nextState;
@end
@implementation MDCStateContext
#pragma mark - Object Lifecycle
- (id)initWithState:(MDCState *)state {
self = [super init];
if (self) {
_currentState = state;
if (_currentState.onEnter) {
_currentState.onEnter();
}
}
return self;
}
#pragma mark - Public Interface
- (void)transitionToState:(MDCState *)state force:(BOOL)force {
if (force) {
self.nextState = state;
if (self.currentState.onExit) {
self.currentState.onExit();
}
[self stateDidExit:self.currentState];
return;
}
if ([state isEqual:self.currentState] || self.nextState) {
return;
}
self.nextState = state;
if (self.currentState.onExit) {
self.currentState.onExit();
} else {
[self stateDidExit:self.currentState];
}
}
#pragma mark - MDCStateDelegate Protocol Methods
- (void)stateDidExit:(MDCState *)state {
_currentState = self.nextState;
if (self.nextState.onEnter) {
self.nextState.onEnter();
}
self.nextState = nil;
}
@end