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/**
* @file lv_x11_input.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_x11.h"
#if LV_USE_X11
#include <stdbool.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include "../../stdlib/lv_string.h"
#include "../../widgets/image/lv_image.h"
#include "../../core/lv_obj.h"
/*********************
* DEFINES
*********************/
#define MIN(A, B) ((A) < (B) ? (A) : (B))
/**********************
* TYPEDEFS
**********************/
typedef struct _x11_inp_data {
/* LVGL related information */
lv_group_t * inp_group; /**< input group for X input elements */
lv_indev_t * keyboard; /**< keyboard input device object */
lv_indev_t * mousepointer; /**< mouse input device object */
lv_indev_t * mousewheel; /**< encoder input device object */
lv_timer_t * timer; /**< timer object for @ref x11_event_handler */
/* user input related information */
char kb_buffer[32]; /**< keyboard buffer for X keyboard inpputs */
lv_point_t mouse_pos; /**< current reported mouse position */
bool left_mouse_btn; /**< current state of left mouse button */
bool right_mouse_btn; /**< current state of right mouse button */
bool wheel_mouse_btn; /**< current state of wheel (=middle) mouse button */
int16_t wheel_cnt; /**< mouse wheel increments */
} x11_inp_data_t;
/**********************
* STATIC VARIABLES
**********************/
/**********************
* MACROS
**********************/
/**********************
* STATIC FUNCTIONS
**********************/
/**
* X11 input event handler, predicated to fetch and handle only input related events
* (MotionNotify, ButtonPress/Release, KeyPress/Release)
*/
static int is_inp_event(Display * disp, XEvent * event, XPointer arg)
{
LV_UNUSED(disp);
LV_UNUSED(arg);
return !(event->type == Expose
|| (event->type >= DestroyNotify && event->type <= CirculateNotify) /* events from StructureNotifyMask */
|| event->type == ClientMessage);
}
static void x11_inp_event_handler(lv_timer_t * t)
{
lv_display_t * disp = lv_timer_get_user_data(t);
_x11_user_hdr_t * disp_hdr = lv_display_get_driver_data(disp);
x11_inp_data_t * xd = disp_hdr->inp_data;
/* handle all outstanding X events */
XEvent event;
while(XCheckIfEvent(disp_hdr->display, &event, is_inp_event, NULL)) {
LV_LOG_TRACE("Input Event %d", event.type);
switch(event.type) {
case MotionNotify:
xd->mouse_pos.x = event.xmotion.x;
xd->mouse_pos.y = event.xmotion.y;
break;
case ButtonPress:
switch(event.xbutton.button) {
case Button1:
xd->left_mouse_btn = true;
break;
case Button2:
xd->wheel_mouse_btn = true;
break;
case Button3:
xd->right_mouse_btn = true;
break;
case Button4: /* Scrolled up */
xd->wheel_cnt--;
break;
case Button5: /* Scrolled down */
xd->wheel_cnt++;
break;
default:
LV_LOG_WARN("unhandled button press : %d", event.xbutton.button);
}
break;
case ButtonRelease:
switch(event.xbutton.button) {
case Button1:
xd->left_mouse_btn = false;
break;
case Button2:
xd->wheel_mouse_btn = false;
break;
case Button3:
xd->right_mouse_btn = false;
break;
}
break;
case KeyPress: {
size_t len = strlen(xd->kb_buffer);
if(len < (sizeof(xd->kb_buffer) - 2 /* space for 1 char + '\0' */)) {
KeySym key;
int n = XLookupString(&event.xkey, &xd->kb_buffer[len], sizeof(xd->kb_buffer) - (len + 1), &key, NULL);
n += !!key;
switch(key) {
case XK_Home:
case XK_KP_Home:
xd->kb_buffer[len] = LV_KEY_HOME;
break;
case XK_Left:
case XK_KP_Left:
xd->kb_buffer[len] = LV_KEY_LEFT;
break;
case XK_Up:
case XK_KP_Up:
xd->kb_buffer[len] = LV_KEY_UP;
break;
case XK_Right:
case XK_KP_Right:
xd->kb_buffer[len] = LV_KEY_RIGHT;
break;
case XK_Down:
case XK_KP_Down:
xd->kb_buffer[len] = LV_KEY_DOWN;
break;
case XK_Prior:
case XK_KP_Prior:
xd->kb_buffer[len] = LV_KEY_PREV;
break;
case XK_Next:
case XK_KP_Next:
xd->kb_buffer[len] = LV_KEY_NEXT;
break;
case XK_End:
case XK_KP_End:
xd->kb_buffer[len] = LV_KEY_END;
break;
case XK_BackSpace:
xd->kb_buffer[len] = LV_KEY_BACKSPACE;
break;
case XK_Escape:
xd->kb_buffer[len] = LV_KEY_ESC;
break;
case XK_Delete:
case XK_KP_Delete:
xd->kb_buffer[len] = LV_KEY_DEL;
break;
case XK_KP_Enter:
xd->kb_buffer[len] = LV_KEY_ENTER;
break;
}
xd->kb_buffer[len + n] = '\0';
}
}
break;
case KeyRelease:
break;
default:
LV_LOG_WARN("unhandled x11 event: %d", event.type);
}
}
}
/**
* event callbed by lvgl display if display has been closed (@ref lv_display_delete has been called)
* @param[in] e event data, containing lv_display_t object
*/
static void x11_inp_delete_evt_cb(lv_event_t * e)
{
x11_inp_data_t * xd = (x11_inp_data_t *)lv_event_get_user_data(e);
lv_timer_delete(xd->timer);
lv_free(xd);
}
/**
* create the local data/timers for the X11 input functionality.
* extracts the user data information from lv_display_t object and initializes the input user object on 1st use.
* @param[in] disp the created X11 display object from @lv_x11_window_create
* @return pointer to the local user data object @x11_inp_data_t
*/
static x11_inp_data_t * x11_input_get_user_data(lv_display_t * disp)
{
_x11_user_hdr_t * disp_hdr = lv_display_get_driver_data(disp);
LV_ASSERT_NULL(disp_hdr);
x11_inp_data_t ** inp_data = &disp_hdr->inp_data;
/* create input data set if initial call */
if(NULL == *inp_data) {
*inp_data = lv_malloc_zeroed(sizeof(x11_inp_data_t));
LV_ASSERT_MALLOC(*inp_data);
if(NULL != *inp_data) {
/* initialize timer callback for X11 kb/mouse input event reading */
(*inp_data)->timer = lv_timer_create(x11_inp_event_handler, 1, disp);
lv_display_add_event_cb(disp, x11_inp_delete_evt_cb, LV_EVENT_DELETE, *inp_data);
}
}
return *inp_data;
}
static void x11_keyboard_read_cb(lv_indev_t * indev, lv_indev_data_t * data)
{
lv_display_t * disp = lv_indev_get_driver_data(indev);
x11_inp_data_t * xd = x11_input_get_user_data(disp);
size_t len = strlen(xd->kb_buffer);
if(len > 0) {
data->state = LV_INDEV_STATE_PRESSED;
data->key = xd->kb_buffer[0];
memmove(xd->kb_buffer, xd->kb_buffer + 1, len);
data->continue_reading = (len > 0);
}
else {
data->state = LV_INDEV_STATE_RELEASED;
}
}
static void x11_mouse_read_cb(lv_indev_t * indev, lv_indev_data_t * data)
{
lv_display_t * disp = lv_indev_get_driver_data(indev);
x11_inp_data_t * xd = x11_input_get_user_data(disp);
int32_t hor_res = lv_display_get_horizontal_resolution(disp);
int32_t ver_res = lv_display_get_vertical_resolution(disp);
xd->mouse_pos.x = MIN(xd->mouse_pos.x, hor_res - 1);
xd->mouse_pos.y = MIN(xd->mouse_pos.y, ver_res - 1);
data->point = xd->mouse_pos;
data->state = xd->left_mouse_btn ? LV_INDEV_STATE_PRESSED : LV_INDEV_STATE_RELEASED;
}
static void x11_mousewheel_read_cb(lv_indev_t * indev, lv_indev_data_t * data)
{
lv_display_t * disp = lv_indev_get_driver_data(indev);
x11_inp_data_t * xd = x11_input_get_user_data(disp);
data->state = xd->wheel_mouse_btn ? LV_INDEV_STATE_PRESSED : LV_INDEV_STATE_RELEASED;
data->enc_diff = xd->wheel_cnt;
xd->wheel_cnt = 0;
}
static lv_indev_t * lv_x11_keyboard_create(lv_display_t * disp)
{
lv_indev_t * indev = lv_indev_create();
LV_ASSERT_NULL(indev);
if(NULL != indev) {
lv_indev_set_type(indev, LV_INDEV_TYPE_KEYPAD);
lv_indev_set_read_cb(indev, x11_keyboard_read_cb);
lv_indev_set_driver_data(indev, disp);
}
return indev;
}
static lv_indev_t * lv_x11_mouse_create(lv_display_t * disp, lv_image_dsc_t const * symb)
{
lv_indev_t * indev = lv_indev_create();
LV_ASSERT_OBJ(indev, MY_CLASS);
if(NULL != indev) {
lv_indev_set_type(indev, LV_INDEV_TYPE_POINTER);
lv_indev_set_read_cb(indev, x11_mouse_read_cb);
lv_indev_set_driver_data(indev, disp);
/* optional mouse cursor symbol */
if(NULL != symb) {
lv_obj_t * mouse_cursor = lv_image_create(lv_screen_active());
lv_image_set_src(mouse_cursor, symb);
lv_indev_set_cursor(indev, mouse_cursor);
}
}
return indev;
}
static lv_indev_t * lv_x11_mousewheel_create(lv_display_t * disp)
{
lv_indev_t * indev = lv_indev_create();
LV_ASSERT_OBJ(indev, MY_CLASS);
if(NULL != indev) {
lv_indev_set_type(indev, LV_INDEV_TYPE_ENCODER);
lv_indev_set_read_cb(indev, x11_mousewheel_read_cb);
lv_indev_set_driver_data(indev, disp);
}
return indev;
}
/**********************
* GLOBAL FUNCTIONS
**********************/
void lv_x11_inputs_create(lv_display_t * disp, lv_image_dsc_t const * mouse_img)
{
x11_inp_data_t * xd = x11_input_get_user_data(disp);
LV_ASSERT_NULL(xd);
xd->inp_group = lv_group_create();
lv_group_set_default(xd->inp_group);
xd->mousepointer = lv_x11_mouse_create(disp, mouse_img);
lv_indev_set_group(xd->mousepointer, xd->inp_group);
xd->mousewheel = lv_x11_mousewheel_create(disp);
lv_indev_set_group(xd->mousewheel, xd->inp_group);
xd->keyboard = lv_x11_keyboard_create(disp);
lv_indev_set_group(xd->keyboard, xd->inp_group);
}
#endif /*LV_USE_X11*/
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