RetroArch/input/input_keyboard.c
2016-10-24 07:06:59 +02:00

299 lines
8.0 KiB
C

/* RetroArch - A frontend for libretro.
* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
* Copyright (C) 2011-2016 - Daniel De Matteis
*
* RetroArch 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 Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* RetroArch 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 RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "input_keyboard.h"
#include "../configuration.h"
#include "../runloop.h"
struct input_keyboard_line
{
char *buffer;
size_t ptr;
size_t size;
/** Line complete callback.
* Calls back after return is
* pressed with the completed line.
* Line can be NULL.
**/
input_keyboard_line_complete_t cb;
void *userdata;
};
static input_keyboard_line_t *g_keyboard_line;
static input_keyboard_press_t g_keyboard_press_cb;
static void *g_keyboard_press_data;
static void input_keyboard_line_toggle_osk(bool enable)
{
settings_t *settings = config_get_ptr();
if (!settings->osk.enable)
return;
if (enable)
input_keyboard_ctl(RARCH_INPUT_KEYBOARD_CTL_SET_LINEFEED_ENABLED, NULL);
else
input_keyboard_ctl(RARCH_INPUT_KEYBOARD_CTL_UNSET_LINEFEED_ENABLED, NULL);
}
/**
* input_keyboard_line_free:
* @state : Input keyboard line handle.
*
* Frees input keyboard line handle.
**/
static void input_keyboard_line_free(input_keyboard_line_t *state)
{
if (!state)
return;
free(state->buffer);
free(state);
input_keyboard_line_toggle_osk(false);
}
/**
* input_keyboard_line_new:
* @userdata : Userdata.
* @cb : Callback function.
*
* Creates and initializes input keyboard line handle.
* Also sets callback function for keyboard line handle
* to provided callback @cb.
*
* Returns: keyboard handle on success, otherwise NULL.
**/
static input_keyboard_line_t *input_keyboard_line_new(void *userdata,
input_keyboard_line_complete_t cb)
{
input_keyboard_line_t *state = (input_keyboard_line_t*)
calloc(1, sizeof(*state));
if (!state)
return NULL;
state->cb = cb;
state->userdata = userdata;
input_keyboard_line_toggle_osk(true);
return state;
}
/**
* input_keyboard_line_event:
* @state : Input keyboard line handle.
* @character : Inputted character.
*
* Called on every keyboard character event.
*
* Returns: true (1) on success, otherwise false (0).
**/
static bool input_keyboard_line_event(
input_keyboard_line_t *state, uint32_t character)
{
char c = character >= 128 ? '?' : character;
/* Treat extended chars as ? as we cannot support
* printable characters for unicode stuff. */
if (c == '\r' || c == '\n')
{
state->cb(state->userdata, state->buffer);
return true;
}
if (c == '\b' || c == '\x7f') /* 0x7f is ASCII for del */
{
if (state->ptr)
{
memmove(state->buffer + state->ptr - 1,
state->buffer + state->ptr,
state->size - state->ptr + 1);
state->ptr--;
state->size--;
}
}
else if (isprint((int)c))
{
/* Handle left/right here when suitable */
char *newbuf = (char*)
realloc(state->buffer, state->size + 2);
if (!newbuf)
return false;
memmove(newbuf + state->ptr + 1,
newbuf + state->ptr,
state->size - state->ptr + 1);
newbuf[state->ptr] = c;
state->ptr++;
state->size++;
newbuf[state->size] = '\0';
state->buffer = newbuf;
}
return false;
}
/**
* input_keyboard_start_line:
* @userdata : Userdata.
* @cb : Line complete callback function.
*
* Sets function pointer for keyboard line handle.
*
* The underlying buffer can be reallocated at any time
* (or be NULL), but the pointer to it remains constant
* throughout the objects lifetime.
*
* Returns: underlying buffer of the keyboard line.
**/
const char **input_keyboard_start_line(void *userdata,
input_keyboard_line_complete_t cb)
{
input_keyboard_ctl(RARCH_INPUT_KEYBOARD_CTL_LINE_FREE, NULL);
g_keyboard_line = input_keyboard_line_new(userdata, cb);
/* While reading keyboard line input, we have to block all hotkeys. */
input_driver_keyboard_mapping_set_block(true);
return (const char**)&g_keyboard_line->buffer;
}
/**
* input_keyboard_event:
* @down : Keycode was pressed down?
* @code : Keycode.
* @character : Character inputted.
* @mod : TODO/FIXME: ???
*
* Keyboard event utils. Called by drivers when keyboard events are fired.
* This interfaces with the global system driver struct and libretro callbacks.
**/
void input_keyboard_event(bool down, unsigned code,
uint32_t character, uint16_t mod, unsigned device)
{
static bool deferred_wait_keys;
if (deferred_wait_keys)
{
if (down)
return;
input_keyboard_ctl(RARCH_INPUT_KEYBOARD_CTL_CANCEL_WAIT_KEYS, NULL);
deferred_wait_keys = false;
}
else if (g_keyboard_press_cb)
{
if (!down || code == RETROK_UNKNOWN)
return;
if (g_keyboard_press_cb(g_keyboard_press_data, code))
return;
deferred_wait_keys = true;
}
else if (g_keyboard_line)
{
if (!down)
return;
switch (device)
{
case RETRO_DEVICE_POINTER:
if (code != 0x12d)
character = (char)code;
/* fall-through */
default:
if (!input_keyboard_line_event(g_keyboard_line, character))
return;
break;
}
/* Line is complete, can free it now. */
input_keyboard_ctl(RARCH_INPUT_KEYBOARD_CTL_LINE_FREE, NULL);
/* Unblock all hotkeys. */
input_driver_keyboard_mapping_set_block(false);
}
else
{
retro_keyboard_event_t *key_event = NULL;
runloop_ctl(RUNLOOP_CTL_KEY_EVENT_GET, &key_event);
if (key_event && *key_event)
(*key_event)(down, code, character, mod);
}
}
bool input_keyboard_ctl(enum rarch_input_keyboard_ctl_state state, void *data)
{
static bool input_driver_keyboard_linefeed_enable = false;
switch (state)
{
case RARCH_INPUT_KEYBOARD_CTL_LINE_FREE:
if (g_keyboard_line)
input_keyboard_line_free(g_keyboard_line);
g_keyboard_line = NULL;
break;
case RARCH_INPUT_KEYBOARD_CTL_START_WAIT_KEYS:
{
input_keyboard_ctx_wait_t *keys = (input_keyboard_ctx_wait_t*)data;
if (!keys)
return false;
g_keyboard_press_cb = keys->cb;
g_keyboard_press_data = keys->userdata;
}
/* While waiting for input, we have to block all hotkeys. */
input_driver_keyboard_mapping_set_block(true);
break;
case RARCH_INPUT_KEYBOARD_CTL_CANCEL_WAIT_KEYS:
g_keyboard_press_cb = NULL;
g_keyboard_press_data = NULL;
input_driver_keyboard_mapping_set_block(false);
break;
case RARCH_INPUT_KEYBOARD_CTL_DESTROY:
input_driver_keyboard_linefeed_enable = false;
break;
case RARCH_INPUT_KEYBOARD_CTL_SET_LINEFEED_ENABLED:
input_driver_keyboard_linefeed_enable = true;
break;
case RARCH_INPUT_KEYBOARD_CTL_UNSET_LINEFEED_ENABLED:
input_driver_keyboard_linefeed_enable = false;
break;
case RARCH_INPUT_KEYBOARD_CTL_IS_LINEFEED_ENABLED:
return input_driver_keyboard_linefeed_enable;
case RARCH_INPUT_KEYBOARD_CTL_NONE:
default:
break;
}
return true;
}