PDP-8-E-Simulator/ASR33/TypeaheadBuffer.m

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/*
* PDP-8/E Simulator
*
* Copyright © 1994-2015 Bernhard Baehr
*
* TypeaheadBuffer.m - Typeahead buffer for a keyboard input device
*
* This file is part of PDP-8/E Simulator.
*
* PDP-8/E Simulator is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#import <Cocoa/Cocoa.h>
#import "PluginFramework/Utilities.h"
#import "PluginFramework/InputConsumerProtocol.h"
#import "TypeaheadBuffer.h"
@implementation TypeaheadBuffer
#define MIN_LENGTH_TO_SHOW_FLUSH_TYPEAHEAD_BUTTON 5
- (IBAction) flush:(id)sender
{
[typeaheadBuffer deleteCharactersInRange:NSMakeRange(0, [typeaheadBuffer length])];
[flushTypeaheadBufferButton setHidden:YES];
}
- (BOOL) hasCharacters
{
return [typeaheadBuffer length] > 0;
}
- (signed short) getNextChar
{
signed short c = 0;
int length = [typeaheadBuffer length];
if (length < MIN_LENGTH_TO_SHOW_FLUSH_TYPEAHEAD_BUTTON)
[flushTypeaheadBufferButton setHidden:YES];
if (length > 0) {
c = [typeaheadBuffer characterAtIndex:0];
[typeaheadBuffer deleteCharactersInRange:NSMakeRange(0, 1)];
}
return c;
}
- (void) typeahead:(NSString *)string
{
int length = [typeaheadBuffer length];
[typeaheadBuffer appendString:string];
if ([typeaheadBuffer length] >= MIN_LENGTH_TO_SHOW_FLUSH_TYPEAHEAD_BUTTON)
[flushTypeaheadBufferButton setHidden:NO];
if (length == 0)
[inputConsumer canContinueInput];
}
- (void) awakeFromNib
{
if (runningOnTiger()) {
NSPoint p = [flushTypeaheadBufferButton frame].origin;
p.x += 2; p.y += 1;
[flushTypeaheadBufferButton setFrameOrigin:p];
[flushTypeaheadBufferButton setBezelStyle:NSRoundRectBezelStyle];
[flushTypeaheadBufferButton setShowsBorderOnlyWhileMouseInside:NO];
[[flushTypeaheadBufferButton cell] setImagePosition:NSNoImage];
}
typeaheadBuffer = [[NSMutableString stringWithCapacity:128] retain];
}
@end