experiments/objcFramework/EDObservation.m

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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.

// This file comes from the portion of the UX Write editor that
// works on both Apple platforms (that is, it can run on either
// OS X or iOS). It's in the repository for illustrative purposes
// only, to assist with the creation of the framework for the
// Corinthia editor UI. The code does not compile independently in
// its present form.

#import "EDObservation.h"
#import <objc/runtime.h>

static NSArray *getPropertyNames(Class cls)
{
    NSMutableArray *propertyNames = [NSMutableArray arrayWithCapacity: 0];
    while ((cls != nil) && (cls != [NSObject class])) {

        unsigned int propertyCount;
        objc_property_t *properties = class_copyPropertyList(cls,&propertyCount);
        for (unsigned int i = 0; i < propertyCount; i++) {
            const char *name = property_getName(properties[i]);
            [propertyNames addObject: [NSString stringWithCString: name encoding: NSUTF8StringEncoding]];
        }
        free(properties);
        cls = class_getSuperclass(cls);
    }
    return propertyNames;
}

void addObserverForAllProperties(NSObject *target, NSObject *anObserver,
                                 NSKeyValueObservingOptions options, void *context)
{
    for (NSString *property in getPropertyNames(target.class))
        [target addObserver: anObserver forKeyPath: property options: options context: nil];
}

void removeObserverForAllProperties(NSObject *target, NSObject *anObserver)
{
    for (NSString *property in getPropertyNames(target.class))
        [target removeObserver: anObserver forKeyPath: property];
}