#include #include #include #include "xcb/xcb.h" #define WIDTH 300 #define HEIGHT 150 static xcb_gc_t getFontGC (xcb_connection_t *connection, xcb_screen_t *screen, xcb_window_t window, const char *fontName ); static void testCookie (xcb_void_cookie_t cookie, xcb_connection_t *connection, char *errMessage ) { xcb_generic_error_t *error = xcb_request_check (connection, cookie); if (error) { fprintf (stderr, "ERROR: %s : %d\n", errMessage , error->error_code); xcb_disconnect (connection); exit (-1); } } static void drawButton (xcb_connection_t *connection, xcb_screen_t *screen, xcb_window_t window, int16_t x1, int16_t y1, const char *label ) { uint8_t length = strlen (label); int16_t inset = 2; int16_t width = 7 * length + 2 * (inset + 1); int16_t height = 13 + 2 * (inset + 1); xcb_point_t points[5]; points[0].x = x1; points[0].y = y1; points[1].x = x1 + width; points[1].y = y1; points[2].x = x1 + width; points[2].y = y1 - height; points[3].x = x1; points[3].y = y1 - height; points[4].x = x1; points[4].y = y1; xcb_gcontext_t gc = getFontGC (connection, screen, window, "7x13"); xcb_void_cookie_t lineCookie = xcb_poly_line_checked (connection, XCB_COORD_MODE_ORIGIN, window, gc, 5, points ); testCookie (lineCookie, connection, "can't draw lines"); xcb_void_cookie_t textCookie = xcb_image_text_8_checked (connection, length, window, gc, x1 + inset + 1, y1 - inset - 1, label ); testCookie (textCookie, connection, "can't paste text"); xcb_void_cookie_t gcCookie = xcb_free_gc (connection, gc); testCookie (gcCookie, connection, "can't free gc"); } static void drawText (xcb_connection_t *connection, xcb_screen_t *screen, xcb_window_t window, int16_t x1, int16_t y1, const char *label ) { xcb_gcontext_t gc = getFontGC (connection, screen, window, "7x13"); xcb_void_cookie_t textCookie = xcb_image_text_8_checked (connection, strlen (label), window, gc, x1, y1, label ); testCookie(textCookie, connection, "can't paste text"); xcb_void_cookie_t gcCookie = xcb_free_gc (connection, gc); testCookie (gcCookie, connection, "can't free gc"); } static xcb_gc_t getFontGC (xcb_connection_t *connection, xcb_screen_t *screen, xcb_window_t window, const char *fontName ) { xcb_font_t font = xcb_generate_id (connection); xcb_void_cookie_t fontCookie = xcb_open_font_checked (connection, font, strlen (fontName), fontName ); testCookie (fontCookie, connection, "can't open font"); xcb_gcontext_t gc = xcb_generate_id (connection); uint32_t mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND | XCB_GC_FONT; uint32_t value_list[3]; value_list[0] = screen->black_pixel; value_list[1] = screen->white_pixel; value_list[2] = font; xcb_void_cookie_t gcCookie = xcb_create_gc_checked (connection, gc, window, mask, value_list ); testCookie (gcCookie, connection, "can't create gc"); fontCookie = xcb_close_font_checked (connection, font); testCookie (fontCookie, connection, "can't close font"); return gc; } static void setCursor (xcb_connection_t *connection, xcb_screen_t *screen, xcb_window_t window, int cursorId ) { uint32_t mask; xcb_font_t font = xcb_generate_id (connection); xcb_void_cookie_t fontCookie = xcb_open_font_checked (connection, font, strlen ("cursor"), "cursor" ); testCookie (fontCookie, connection, "can't open font"); xcb_cursor_t cursor = xcb_generate_id (connection); xcb_create_glyph_cursor (connection, cursor, font, font, cursorId, cursorId + 1, 0, 0, 0, 0, 0, 0 ); xcb_gcontext_t gc = xcb_generate_id (connection); mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND | XCB_GC_FONT; uint32_t values_list[3]; values_list[0] = screen->black_pixel; values_list[1] = screen->white_pixel; values_list[2] = font; xcb_void_cookie_t gcCookie = xcb_create_gc_checked (connection, gc, window, mask, values_list); testCookie (gcCookie, connection, "can't create gc"); mask = XCB_CW_CURSOR; uint32_t value_list = cursor; xcb_change_window_attributes (connection, window, mask, &value_list); xcb_free_cursor (connection, cursor); fontCookie = xcb_close_font_checked (connection, font); testCookie (fontCookie, connection, "can't close font"); } int main () { int screenNum,i; xcb_connection_t *connection = xcb_connect ("127.0.0.1:0.0", &screenNum); if (!connection) { fprintf (stderr, "ERROR: can't connect to an X server\n"); return -1; } xcb_screen_iterator_t iter = xcb_setup_roots_iterator (xcb_get_setup (connection)); for (i = 0; i < screenNum; ++i) { xcb_screen_next (&iter); } xcb_screen_t *screen = iter.data; if (!screen) { fprintf (stderr, "ERROR: can't get the current screen\n"); xcb_disconnect (connection); return -1; } xcb_window_t window = xcb_generate_id (connection); uint32_t mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK; uint32_t values[2]; values[0] = screen->white_pixel; values[1] = XCB_EVENT_MASK_KEY_RELEASE | XCB_EVENT_MASK_BUTTON_PRESS | XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_POINTER_MOTION; xcb_void_cookie_t windowCookie = xcb_create_window_checked (connection, screen->root_depth, window, screen->root, 20, 200, WIDTH, HEIGHT, 0, XCB_WINDOW_CLASS_INPUT_OUTPUT, screen->root_visual, mask, values ); testCookie (windowCookie, connection, "can't create window"); xcb_void_cookie_t mapCookie = xcb_map_window_checked (connection, window); testCookie (mapCookie, connection, "can't map window"); setCursor (connection, screen, window, 68); xcb_flush(connection); uint8_t isHand = 0; while (1) { xcb_generic_event_t *event = xcb_poll_for_event (connection); if (event) { switch (event->response_type & ~0x80) { case XCB_EXPOSE: { char *text = "click here to change cursor"; drawButton (connection, screen, window, (WIDTH - 7 * strlen(text)) / 2, (HEIGHT - 16) / 2, text ); text = "Press ESC key to exit..."; drawText (connection, screen, window, 10, HEIGHT - 10, text ); break; } case XCB_BUTTON_PRESS: { xcb_button_press_event_t *press = (xcb_button_press_event_t *)event; int length = strlen ("click here to change cursor"); if ((press->event_x >= (WIDTH - 7 * length) / 2) && (press->event_x <= ((WIDTH - 7 * length) / 2 + 7 * length + 6)) && (press->event_y >= (HEIGHT - 16) / 2 - 19) && (press->event_y <= ((HEIGHT - 16) / 2))) { isHand = 1 - isHand; } if (isHand) { setCursor (connection, screen, window, 58); } else { setCursor (connection, screen, window, 68); } } case XCB_KEY_RELEASE: { xcb_key_release_event_t *kr = (xcb_key_release_event_t *)event; switch (kr->detail) { case 9: free (event); xcb_disconnect (connection); return 0; } } } free (event); } } return 0; }