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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
{
xcb_connection_t *conn;
xcb_screen_t *scr;
xcb_window_t win;
int16_t root_x, root_y;
int16_t win_x, win_y;
bool 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_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);
xh->win_x = xh->win_y = 0;
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);
}
void xh_update_current_position(xhorse_t *xh)
{
xcb_translate_coordinates_cookie_t cookie =
xcb_translate_coordinates(xh->conn, xh->win, xh->scr->root, 0, 0);
xcb_translate_coordinates_reply_t *reply =
xcb_translate_coordinates_reply(xh->conn, cookie, NULL);
if (reply)
{
xh->win_x = reply->dst_x;
xh->win_y = reply->dst_y;
free(reply);
}
}
void xh_handle_motion(xhorse_t *xh, xcb_generic_event_t *generic_ev)
{
if (!xh->dragging) return;
xcb_motion_notify_event_t *motion_ev = (xcb_motion_notify_event_t *)generic_ev;
int32_t pos[2] = {
xh->win_x + (motion_ev->root_x - xh->root_x),
xh->win_y + (motion_ev->root_y - xh->root_y)
};
xcb_configure_window(xh->conn, xh->win, XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y, pos);
xcb_flush(xh->conn);
}
void xh_event_loop(xhorse_t *xh)
{
xcb_generic_event_t *generic_ev;
while ((generic_ev = xcb_wait_for_event(xh->conn)))
{
uint8_t response_type = generic_ev->response_type & ~0x80;
switch (response_type)
{
case XCB_EXPOSE:
case XCB_BUTTON_RELEASE:
xh->dragging = false;
break;
case XCB_KEY_PRESS:
{
xcb_key_press_event_t *press_ev = (xcb_key_press_event_t *)generic_ev;
if (ESC_BUTTON == press_ev->detail)
return;
break;
}
case XCB_BUTTON_PRESS:
{
xcb_button_press_event_t *mouse_ev = (xcb_button_press_event_t *)generic_ev;
xh_update_current_position(xh);
xh->root_x = mouse_ev->root_x;
xh->root_y = mouse_ev->root_y;
xh->dragging = true;
break;
}
case XCB_MOTION_NOTIFY:
{
xh_handle_motion(xh, generic_ev);
break;
}
}
free(generic_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);
xh_event_loop(xh);
xh_disconnect(xh);
free(xh);
return EXIT_SUCCESS;
}
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