MultiClickRemoteBehavior.m

Go to the documentation of this file.

/* -*- Mode: ObjC; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*****************************************************************************
 * MultiClickRemoteBehavior.m
 * RemoteControlWrapper
 *
 * Created by Martin Kahr on 11.03.06 under a MIT-style license.
 * Copyright (c) 2006 martinkahr.com. All rights reserved.
 *
 * Code modified and adapted to OpenOffice.org
 * by Eric Bachard on 11.08.2008 under the same License
 *
 * 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 "MultiClickRemoteBehavior.h"
 
static const NSTimeInterval DEFAULT_MAXIMUM_CLICK_TIME_DIFFERENCE = 0.35;
static const NSTimeInterval HOLD_RECOGNITION_TIME_INTERVAL = 0.4;
 
@implementation MultiClickRemoteBehavior
 
- (id) init {
    if ( (self = [super init]) ) {
        maxClickTimeDifference = DEFAULT_MAXIMUM_CLICK_TIME_DIFFERENCE;
    }
    return self;
}
 
// Delegates are not retained!
// http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaFundamentals/CommunicatingWithObjects/chapter_6_section_4.html
// Delegating objects do not (and should not) retain their delegates.
// However, clients of delegating objects (applications, usually) are responsible for ensuring that their delegates are around
// to receive delegation messages. To do this, they may have to retain the delegate.
- (void) setDelegate: (id) _delegate {
    if ( _delegate && ( [_delegate respondsToSelector:@selector(remoteButton:pressedDown:clickCount:)] == NO )) return; // return what ?
 
    delegate = _delegate;
}
- (id) delegate {
    return delegate;
}
 
- (BOOL) simulateHoldEvent {
    return simulateHoldEvents;
}
- (void) setSimulateHoldEvent: (BOOL) value {
    simulateHoldEvents = value;
}
 
- (BOOL) simulatesHoldForButtonIdentifier: (RemoteControlEventIdentifier) identifier remoteControl: (RemoteControl*) remoteControl {
    // we do that check only for the normal button identifiers as we would check for hold support for hold events instead
    if (identifier > (1 << EVENT_TO_HOLD_EVENT_OFFSET)) return NO;
 
    return [self simulateHoldEvent] && [remoteControl sendsEventForButtonIdentifier: (identifier << EVENT_TO_HOLD_EVENT_OFFSET)]==NO;
}
 
- (BOOL) clickCountingEnabled {
    return clickCountEnabledButtons != 0;
}
- (void) setClickCountingEnabled: (BOOL) value {
    if (value) {
       [self setClickCountEnabledButtons: kRemoteButtonPlus | kRemoteButtonMinus | kRemoteButtonPlay | kRemoteButtonLeft | kRemoteButtonRight | kRemoteButtonMenu | kMetallicRemote2009ButtonPlay | kMetallicRemote2009ButtonMiddlePlay];
    } else {
        [self setClickCountEnabledButtons: 0];
    }
}
 
- (unsigned int) clickCountEnabledButtons {
    return clickCountEnabledButtons;
}
- (void) setClickCountEnabledButtons: (unsigned int)value {
    clickCountEnabledButtons = value;
}
 
- (NSTimeInterval) maximumClickCountTimeDifference {
    return maxClickTimeDifference;
}
- (void) setMaximumClickCountTimeDifference: (NSTimeInterval) timeDiff {
    maxClickTimeDifference = timeDiff;
}
 
- (void) sendSimulatedHoldEvent: (id) time {
    BOOL startSimulateHold = NO;
    RemoteControlEventIdentifier event = lastHoldEvent;
    @synchronized(self) {
        startSimulateHold = (lastHoldEvent>0 && lastHoldEventTime == [time doubleValue]);
    }
    if (startSimulateHold) {
        lastEventSimulatedHold = YES;
        event = (event << EVENT_TO_HOLD_EVENT_OFFSET);
        [delegate remoteButton:event pressedDown: YES clickCount: 1];
    }
}
 
- (void) executeClickCountEvent: (NSArray*) values {
    RemoteControlEventIdentifier event = [[values objectAtIndex: 0] unsignedIntValue];
    NSTimeInterval eventTimePoint = [[values objectAtIndex: 1] doubleValue];
 
    BOOL finishedClicking = NO;
    int finalClickCount = eventClickCount;
 
    @synchronized(self) {
        finishedClicking = (event != lastClickCountEvent || eventTimePoint == lastClickCountEventTime);
        if (finishedClicking) {
            eventClickCount = 0;
            lastClickCountEvent = 0;
            lastClickCountEventTime = 0;
        }
    }
 
    if (finishedClicking) {
        [delegate remoteButton:event pressedDown: YES clickCount:finalClickCount];
        // trigger a button release event, too
        [NSThread sleepUntilDate: [NSDate dateWithTimeIntervalSinceNow:0.1]];
        [delegate remoteButton:event pressedDown: NO clickCount:finalClickCount];
    }
}
 
- (void) sendRemoteButtonEvent: (RemoteControlEventIdentifier) event pressedDown: (BOOL) pressedDown remoteControl: (RemoteControl*) remoteControl {
    if (!delegate)  return;
 
    BOOL clickCountingForEvent = ([self clickCountEnabledButtons] & event) == event;
 
    if ([self simulatesHoldForButtonIdentifier: event remoteControl: remoteControl] && lastClickCountEvent==0) {
        if (pressedDown) {
            // wait to see if it is a hold
            lastHoldEvent = event;
            lastHoldEventTime = [NSDate timeIntervalSinceReferenceDate];
            [self performSelector:@selector(sendSimulatedHoldEvent:)
                       withObject:[NSNumber numberWithDouble:lastHoldEventTime]
                       afterDelay:HOLD_RECOGNITION_TIME_INTERVAL];
            return;
        } else {
            if (lastEventSimulatedHold) {
                // it was a hold
                // send an event for "hold release"
                event = (event << EVENT_TO_HOLD_EVENT_OFFSET);
                lastHoldEvent = 0;
                lastEventSimulatedHold = NO;
 
                [delegate remoteButton:event pressedDown: pressedDown clickCount:1];
                return;
            } else {
                RemoteControlEventIdentifier previousEvent = lastHoldEvent;
                @synchronized(self) {
                    lastHoldEvent = 0;
                }
 
                // in case click counting is enabled we have to setup the state for that, too
                if (clickCountingForEvent) {
                    lastClickCountEvent = previousEvent;
                    lastClickCountEventTime = lastHoldEventTime;
                    NSNumber* eventNumber;
                    NSNumber* timeNumber;
                    eventClickCount = 1;
                    timeNumber = [NSNumber numberWithDouble:lastClickCountEventTime];
                    eventNumber= [NSNumber numberWithUnsignedInt:previousEvent];
                    NSTimeInterval diffTime = maxClickTimeDifference-([NSDate timeIntervalSinceReferenceDate]-lastHoldEventTime);
                    [self performSelector: @selector(executeClickCountEvent:)
                               withObject: [NSArray arrayWithObjects:eventNumber, timeNumber, nil]
                               afterDelay: diffTime];
                    // we do not return here because we are still in the press-release event
                    // that will be consumed below
                } else {
                    // trigger the pressed down event that we consumed first
                    [delegate remoteButton:event pressedDown: YES clickCount:1];
                }
            }
        }
    }
 
    if (clickCountingForEvent) {
        if (pressedDown == NO) return;
 
        NSNumber* eventNumber;
        NSNumber* timeNumber;
        @synchronized(self) {
            lastClickCountEventTime = [NSDate timeIntervalSinceReferenceDate];
            if (lastClickCountEvent == event) {
                eventClickCount = eventClickCount + 1;
            } else {
                eventClickCount = 1;
            }
            lastClickCountEvent = event;
            timeNumber = [NSNumber numberWithDouble:lastClickCountEventTime];
            eventNumber= [NSNumber numberWithUnsignedInt:event];
        }
        [self performSelector: @selector(executeClickCountEvent:)
                   withObject: [NSArray arrayWithObjects:eventNumber, timeNumber, nil]
                   afterDelay: maxClickTimeDifference];
    } else {
        [delegate remoteButton:event pressedDown: pressedDown clickCount:1];
    }
 
}
 
@end
 
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */