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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2014 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU General Public License, as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any
* later version. Please see the file LICENSE-GPL for details.
*
* Web Page: http://mielke.cc/brltty/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#include "prologue.h"
#include "blink.h"
#include "prefs.h"
#include "async_alarm.h"
#include "update.h"
#include "brltty.h"
struct BlinkDescriptorStruct {
const char *const name;
const unsigned char *const isEnabled;
const unsigned char *const visibleTime;
const unsigned char *const invisibleTime;
unsigned isRequired:1;
unsigned isVisible:1;
AsyncHandle alarmHandle;
};
BlinkDescriptor screenCursorBlinkDescriptor = {
.name = "screen cursor",
.isEnabled = &prefs.blinkingCursor,
.visibleTime = &prefs.cursorVisibleTime,
.invisibleTime = &prefs.cursorInvisibleTime
};
BlinkDescriptor attributesUnderlineBlinkDescriptor = {
.name = "attributes underline",
.isEnabled = &prefs.blinkingAttributes,
.visibleTime = &prefs.attributesVisibleTime,
.invisibleTime = &prefs.attributesInvisibleTime
};
BlinkDescriptor uppercaseLettersBlinkDescriptor = {
.name = "uppercase letters",
.isEnabled = &prefs.blinkingCapitals,
.visibleTime = &prefs.capitalsVisibleTime,
.invisibleTime = &prefs.capitalsInvisibleTime
};
BlinkDescriptor speechCursorBlinkDescriptor = {
.name = "speech cursor",
.isEnabled = &prefs.blinkingSpeechCursor,
.visibleTime = &prefs.speechCursorVisibleTime,
.invisibleTime = &prefs.speechCursorInvisibleTime
};
static BlinkDescriptor *const blinkDescriptors[] = {
&screenCursorBlinkDescriptor,
&attributesUnderlineBlinkDescriptor,
&uppercaseLettersBlinkDescriptor,
&speechCursorBlinkDescriptor,
NULL
};
int
isBlinkVisible (const BlinkDescriptor *blink) {
if (!*blink->isEnabled) return 1;
return blink->isVisible;
}
static int
getBlinkDuration (const BlinkDescriptor *blink) {
return PREFERENCES_TIME(blink->isVisible? *blink->visibleTime: *blink->invisibleTime);
}
void
setBlinkState (BlinkDescriptor *blink, int visible) {
int changed = visible != blink->isVisible;
blink->isVisible = visible;
if (blink->alarmHandle) {
asyncResetAlarmIn(blink->alarmHandle, getBlinkDuration(blink));
if (changed) scheduleUpdate("blink state set");
}
}
static void setBlinkAlarm (BlinkDescriptor *blink);
ASYNC_ALARM_CALLBACK(handleBlinkAlarm) {
BlinkDescriptor *blink = parameters->data;
asyncDiscardHandle(blink->alarmHandle);
blink->alarmHandle = NULL;
blink->isVisible = !blink->isVisible;
setBlinkAlarm(blink);
scheduleUpdate("blink state changed");
}
static void
setBlinkAlarm (BlinkDescriptor *blink) {
asyncSetAlarmIn(&blink->alarmHandle, getBlinkDuration(blink), handleBlinkAlarm, blink);
}
static void
forEachBlinkDescriptor (void (*handleBlinkDescriptor) (BlinkDescriptor *blink)) {
BlinkDescriptor *const *blink = blinkDescriptors;
while (*blink) handleBlinkDescriptor(*blink++);
}
static void
unrequireBlinkDescriptor (BlinkDescriptor *blink) {
blink->isRequired = 0;
}
void
unrequireAllBlinkDescriptors (void) {
forEachBlinkDescriptor(unrequireBlinkDescriptor);
}
void
requireBlinkDescriptor (BlinkDescriptor *blink) {
blink->isRequired = 1;
}
static void
stopBlinkDescriptor (BlinkDescriptor *blink) {
if (blink->alarmHandle) {
asyncCancelRequest(blink->alarmHandle);
blink->alarmHandle = NULL;
}
}
void
stopAllBlinkDescriptors (void) {
forEachBlinkDescriptor(stopBlinkDescriptor);
}
static void
resetBlinkDescriptor (BlinkDescriptor *blink) {
if (!(*blink->isEnabled && blink->isRequired)) {
stopBlinkDescriptor(blink);
} else if (!blink->alarmHandle) {
setBlinkAlarm(blink);
}
}
void
resetAllBlinkDescriptors (void) {
forEachBlinkDescriptor(resetBlinkDescriptor);
}
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