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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <xcb/xcb.h>
const int ESC_BUTTON = 9;
typedef struct xhorse_position
{
int32_t x, y;
} xhorse_position_t;
typedef struct xhorse_size
{
int32_t w, h;
} xhorse_size_t;
typedef struct xhorse
{
xcb_connection_t *conn;
xcb_screen_t *scr;
xcb_window_t win;
xhorse_position_t p_root, p_win;
xhorse_size_t s_win;
bool f_running, f_dragging;
} xhorse_t;
bool xh_connect(xhorse_t *xh)
{
xh->conn = xcb_connect(NULL, NULL);
if (!xh->conn || xcb_connection_has_error(xh->conn))
{
return false;
}
return true;
}
void xh_disconnect(xhorse_t *xh)
{
xcb_unmap_window(xh->conn, xh->win);
xcb_flush(xh->conn);
xcb_disconnect(xh->conn);
}
void xh_update_window_state(xhorse_t *xh)
{
xcb_translate_coordinates_cookie_t coords_c;
xcb_get_geometry_cookie_t geom_c;
xcb_translate_coordinates_reply_t *coords_r;
xcb_get_geometry_reply_t *geom_r;
coords_c = xcb_translate_coordinates(xh->conn, xh->win, xh->scr->root, 0, 0);
coords_r = xcb_translate_coordinates_reply(xh->conn, coords_c, NULL);
geom_c = xcb_get_geometry(xh->conn, xh->win);
geom_r = xcb_get_geometry_reply(xh->conn, geom_c, NULL);
if (NULL != coords_r)
{
xh->p_win.x = coords_r->dst_x;
xh->p_win.y = coords_r->dst_y;
free(coords_r);
}
if (NULL != geom_r)
{
xh->s_win.w = geom_r->width;
xh->s_win.h = geom_r->height;
free(geom_r);
}
}
void xh_setup(xhorse_t *xh)
{
const xcb_setup_t *set = xcb_get_setup(xh->conn);
xh->scr = xcb_setup_roots_iterator(set).data;
uint32_t mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
uint32_t vals[] = {
xh->scr->white_pixel,
XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_KEY_PRESS |
XCB_EVENT_MASK_BUTTON_PRESS | XCB_EVENT_MASK_BUTTON_RELEASE |
XCB_EVENT_MASK_BUTTON_MOTION
};
xh->win = xcb_generate_id(xh->conn);
xcb_void_cookie_t cookie = xcb_create_window(xh->conn, /* depth */ XCB_COPY_FROM_PARENT, xh->win, xh->scr->root,
/* x */ 0, /* y */ 0, /* w */ 150, /* h */ 75,
/* border width*/ 10, XCB_WINDOW_CLASS_INPUT_OUTPUT,
xh->scr->root_visual, mask, vals);
xcb_map_window(xh->conn, xh->win);
xh->f_running = true;
xh_update_window_state(xh);
}
void xh_handle_btn_press(xhorse_t *xh, xcb_generic_event_t *ev)
{
xh_update_window_state(xh);
if (false == xh->f_dragging)
xh->f_dragging = true;
xcb_key_press_event_t *kp_ev = (xcb_key_press_event_t *)ev;
xh->p_root.x = kp_ev->root_x;
xh->p_root.y = kp_ev->root_y;
}
void xh_handle_btn_release(xhorse_t *xh, xcb_generic_event_t *ev)
{
if (true == xh->f_dragging)
xh->f_dragging = false;
}
void xh_handle_key_press(xhorse_t *xh, xcb_generic_event_t *ev)
{
xcb_keycode_t btn = ((xcb_key_press_event_t *)ev)->detail;
if (ESC_BUTTON == btn)
xh->f_running = false;
}
void xh_handle_motion(xhorse_t *xh, xcb_generic_event_t *generic_ev)
{
if (!xh->f_dragging) return;
xcb_motion_notify_event_t *motion_ev = (xcb_motion_notify_event_t *)generic_ev;
int32_t pos[2] = {
xh->p_win.x + (motion_ev->root_x - xh->p_root.x),
xh->p_win.y + (motion_ev->root_y - xh->p_root.y)
};
xcb_configure_window(xh->conn, xh->win, XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y, pos);
xcb_flush(xh->conn);
}
void xh_poll_for_events(xhorse_t *xh)
{
xcb_generic_event_t *ev;
while (NULL != (ev = xcb_poll_for_event(xh->conn)))
{
switch (ev->response_type & ~0x80)
{
case XCB_BUTTON_PRESS:
xh_handle_btn_press(xh, ev);
break;
case XCB_BUTTON_RELEASE:
xh_handle_btn_release(xh, ev);
break;
case XCB_KEY_PRESS:
xh_handle_key_press(xh, ev);
break;
case XCB_MOTION_NOTIFY:
xh_handle_motion(xh, ev);
break;
}
free(ev);
}
}
int main(void)
{
xhorse_t *xh = malloc(sizeof(xhorse_t));
if (false == xh_connect(xh)) {
puts("can't connect to X");
return EXIT_FAILURE;
}
xh_setup(xh);
xcb_flush(xh->conn);
while (xh->f_running)
{
xh_poll_for_events(xh);
// xh_gravity_step(xh)
}
xh_disconnect(xh);
free(xh);
return EXIT_SUCCESS;
}
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