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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) 1995-2018 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU Lesser General Public License, as published by the Free Software
* Foundation; either version 2.1 of the License, or (at your option) any
* later version. Please see the file LICENSE-LGPL for details.
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*
* Web Page: http://brltty.com/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
/* scr.cc - The screen reading library
*
* Note: Although C++, this code requires no standard C++ library.
* This is important as BRLTTY *must not* rely on too many
* run-time shared libraries, nor be a huge executable.
*/
#include "prologue.h"
#include "log.h"
#include "scr.h"
#include "scr_special.h"
#include "update.h"
#include "message.h"
#include "scr_frozen.h"
static FrozenScreen frozenScreen;
static int
frozenScreen_construct (void) {
return frozenScreen.construct(&mainScreen.base);
}
#include "scr_help.h"
static HelpScreen helpScreen;
static int
helpScreen_construct (void) {
return helpScreen.construct();
}
#include "scr_menu.h"
#include "menu_prefs.h"
static MenuScreen menuScreen;
static int
menuScreen_construct (void) {
Menu *menu = getPreferencesMenu();
if (!menu) return 0;
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return menuScreen.construct(menu);
}
typedef struct {
const char *const name;
int (*const construct) (void);
void (**const destruct) (void);
BaseScreen *const base;
const unsigned autoDestruct:1;
unsigned isConstructed:1;
unsigned isActive:1;
} SpecialScreenEntry;
#define SPECIAL_SCREEN_INITIALIZER(type) \
.name = #type, \
.construct = type ## Screen_construct, \
.destruct = &type ## Screen.destruct, \
.base = &type ## Screen.base
static SpecialScreenEntry specialScreenTable[] = {
[SCR_FROZEN] = {
SPECIAL_SCREEN_INITIALIZER(frozen),
.autoDestruct = 1
},
[SCR_HELP] = {
SPECIAL_SCREEN_INITIALIZER(help)
},
[SCR_MENU] = {
SPECIAL_SCREEN_INITIALIZER(menu)
},
};
static const unsigned char specialScreenCount = ARRAY_COUNT(specialScreenTable);
static SpecialScreenEntry *
getSpecialScreenEntry (SpecialScreenType type) {
return &specialScreenTable[type];
}
static void
logScreenAction (const char *type, const char *name, const char *action) {
logMessage(LOG_DEBUG, "%s %s screen: %s", action, type, name);
}
static void
logMainScreenAction (const char *action) {
logScreenAction("main", screen->definition.name, action);
}
static void
logSpecialScreenAction (const SpecialScreenEntry *sse, const char *action) {
logScreenAction("special", sse->name, action);
}
static int
constructSpecialScreen (SpecialScreenEntry *sse) {
if (sse->isConstructed) return !sse->autoDestruct;
logSpecialScreenAction(sse, "constructing");
if (!sse->construct()) return 0;
sse->isConstructed = 1;
return 1;
}
static void
destructSpecialScreen (SpecialScreenEntry *sse) {
if (sse->isConstructed) {
logSpecialScreenAction(sse, "destructing");
(*sse->destruct)();
sse->isConstructed = 0;
}
}
void
beginSpecialScreens (void) {
initializeFrozenScreen(&frozenScreen);
initializeMenuScreen(&menuScreen);
initializeHelpScreen(&helpScreen);
}
void
endSpecialScreens (void) {
SpecialScreenEntry *sse = specialScreenTable;
SpecialScreenEntry *end = sse + specialScreenCount;
while (sse < end) {
destructSpecialScreen(sse);
sse += 1;
}
}
static void
announceCurrentScreen (void) {
const char *title = currentScreen->getTitle();
if (title) message(NULL, title, 0);
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}
static void
setCurrentScreen (BaseScreen *screen) {
currentScreen = screen;
scheduleUpdate("new screen selected");
announceCurrentScreen();
}
static void
setSpecialScreen (const SpecialScreenEntry *sse) {
logSpecialScreenAction(sse, "selecting");
setCurrentScreen(sse->base);
}
static void
selectCurrentScreen (void) {
const SpecialScreenEntry *sse = specialScreenTable;
const SpecialScreenEntry *end = sse + specialScreenCount;
while (sse < end) {
if (sse->isActive) break;
sse += 1;
}
if (sse == end) {
logMainScreenAction("selecting");
setCurrentScreen(&mainScreen.base);
} else {
setSpecialScreen(sse);
}
}
int
activateSpecialScreen (SpecialScreenType type) {
SpecialScreenEntry *sse = getSpecialScreenEntry(type);
if (!constructSpecialScreen(sse)) return 0;
logSpecialScreenAction(sse, "activating");
sse->isActive = 1;
setSpecialScreen(sse);
return 1;
}
void
deactivateSpecialScreen (SpecialScreenType type) {
SpecialScreenEntry *sse = getSpecialScreenEntry(type);
logSpecialScreenAction(sse, "deactivating");
sse->isActive = 0;
if (sse->autoDestruct) destructSpecialScreen(sse);
selectCurrentScreen();
}
int
haveSpecialScreen (SpecialScreenType type) {
return getSpecialScreenEntry(type)->isActive;
}
int
isSpecialScreen (SpecialScreenType type) {
return currentScreen == getSpecialScreenEntry(type)->base;
}
int
constructHelpScreen (void) {
SpecialScreenEntry *sse = getSpecialScreenEntry(SCR_HELP);
return constructSpecialScreen(sse);
}
int
addHelpPage (void) {
return helpScreen.addPage();
}
unsigned int
getHelpPageCount (void) {
return helpScreen.getPageCount();
}
unsigned int
getHelpPageNumber (void) {
return helpScreen.getPageNumber();
}
int
setHelpPageNumber (unsigned int number) {
return helpScreen.setPageNumber(number);
}
int
clearHelpPage (void) {
return helpScreen.clearPage();
}
int
addHelpLine (const wchar_t *characters) {
return helpScreen.addLine(characters);
}
unsigned int
getHelpLineCount (void) {
return helpScreen.getLineCount();
}