[Xcb-commit] tutorial
XCB site
xcb at freedesktop.org
Mon Nov 12 02:53:32 PST 2007
tutorial/mousecursors.mdwn | 852 ++++++++++++++++++++++-----------------------
1 file changed, 432 insertions(+), 420 deletions(-)
New commits:
commit cfae850759c2631a57c9cf6420200ffbf7f60384
Author: brian.thomas.will <brian.thomas.will at gmail.com>
Date: Mon Nov 12 02:53:31 2007 -0800
did code formatting, but still needs refactoring to be more readable
diff --git a/tutorial/mousecursors.mdwn b/tutorial/mousecursors.mdwn
index 6e16c88..7551e3f 100644
--- a/tutorial/mousecursors.mdwn
+++ b/tutorial/mousecursors.mdwn
@@ -1,449 +1,461 @@
-# 17. Messing with the mouse cursor
+# Messing with the mouse cursor
-It it possible to modify the shape of the mouse pointer (also called the X pointer) when in certain states, as we otfen see in programs. For example, a busy application would often display the sand clock over its main window, to give the user a visual hint that he should wait. Let's see how we can change the mouse cursor of our windows.
+It it possible to modify the shape of the mouse pointer (also called the X pointer) when in certain states, as we often see in programs. For example, a busy application would often display the sand clock over its main window, to give the user a visual hint that he should wait. Let's see how we can change the mouse cursor of our windows.
-### 17.1 Creating and destroying a mouse cursor
+### 1. Creating and destroying a mouse cursor
There are two methods for creating cursors. One of them is by using a set of predefined cursors, that are supplied by the X server, the other is by using a user-supplied bitmap.
-In the first method, we use a special font named "cursor", and the function xcb_create_glyph_cursor:
-
- xcb_void_cookie_t xcb_create_glyph_cursor (xcb_connection_t *c,
- xcb_cursor_t cid,
- xcb_font_t source_font, /* font for the source glyph */
- xcb_font_t mask_font, /* font for the mask glyph or XCB_NONE */
- uint16_t source_char, /* character glyph for the source */
- uint16_t mask_char, /* character glyph for the mask */
- uint16_t fore_red, /* red value for the foreground of the source */
- uint16_t fore_green, /* green value for the foreground of the source */
- uint16_t fore_blue, /* blue value for the foreground of the source */
- uint16_t back_red, /* red value for the background of the source */
- uint16_t back_green, /* green value for the background of the source */
- uint16_t back_blue) /* blue value for the background of the source */
+In the first method, we use a special font named "cursor", and the function xcb\_create\_glyph\_cursor:
+
+ xcb_void_cookie_t
+ xcb_create_glyph_cursor (xcb_connection_t *connection,
+ xcb_cursor_t cursorId,
+ xcb_font_t source_font, /* font for the source glyph */
+ xcb_font_t mask_font, /* font for the mask glyph or XCB_NONE */
+ uint16_t source_char, /* character glyph for the source */
+ uint16_t mask_char, /* character glyph for the mask */
+ uint16_t fore_red, /* red value for the foreground of the source */
+ uint16_t fore_green, /* green value for the foreground of the source */
+ uint16_t fore_blue, /* blue value for the foreground of the source */
+ uint16_t back_red, /* red value for the background of the source */
+ uint16_t back_green, /* green value for the background of the source */
+ uint16_t back_blue ); /* blue value for the background of the source */
TODO: Describe source_char and mask_char, for example by giving an example on how to get the values. There is a list there: X Font Cursors
-So we first open that font (see Loading a Font) and create the new cursor. As for every X ressource, we have to ask for an X id with xcb_generate_id first:
+So we first open that font (see Loading a Font) and create the new cursor. As for every X ressource, we have to ask for an X id with xcb\_generate\_id first:
- xcb_font_t font;
- xcb_cursor_t cursor;
+ font;
+ xcb_cursor_t cursor;
- /* The connection is set */
- font = xcb_generate_id (conn);
- xcb_open_font (conn, font, strlen ("cursor"), "cursor");
- cursor = xcb_generate_id (conn);
- xcb_create_glyph_cursor (conn, cursor, font, font,
- 58, 58 + 1,
- 0, 0, 0,
- 0, 0, 0);
+ xcb_font_t font = xcb_generate_id (connection);
+ xcb_open_font (connection, font, strlen ("cursor"), "cursor");
-We have created the cursor "right hand" by specifying 58 to the source_font argument and 58 + 1 to the mask_font.
+ cursor = xcb_generate_id (connection);
+ xcb_create_glyph_cursor (connection,
+ cursor, // cursor id
+ font, // source glyph font
+ font, // mask glyph font
+ 58, // source character glyph
+ 58 + 1, // mask character glyph
+ 0, 0, 0, 0, 0, 0); // r b g r b g
-The cursor is destroyed by using the function
+We have created the cursor "right hand" by specifying 58 to the source\_font argument and 58 + 1 to the mask\_font.
- xcb_void_cookie_t xcb_free_cursor (xcb_connection_t *c,
- xcb_cursor_t cursor);
+The cursor is freed by using the function:
-In the second method, we create a new cursor by using a pair of pixmaps, with depth of one (that is, two colors pixmaps). One pixmap defines the shape of the cursor, while the other works as a mask, specifying which pixels of the cursor will be actually drawn. The rest of the pixels will be transparent.
+ xcb_void_cookie_t
+ xcb_free_cursor (xcb_connection_t *connection,
+ xcb_cursor_t cursor );
-TODO: give an example.
+In the second method, we create a new cursor by using a pair of pixmaps with bit depth of one (that is, two-color pixmaps). One pixmap defines the shape of the cursor while the other works as a mask that specifies which pixels of the cursor will be actually drawn (the rest of the pixels will be transparent).
-### 17.2 Setting a window's mouse cursor
+TODO: give an example.
-Once the cursor is created, we can modify the cursor of our window by using xcb_change_window_attributes and using the XCB_CWCURSOR attribute:
+### 2. Setting a window's mouse cursor
- uint32_t mask;
- uint32_t value_list;
+Once the cursor is created, we can modify the cursor of our window by using xcb\_change\_window_attributes and using the XCB\_CW\_CURSOR attribute:
- /* The connection and window are set */
- /* The cursor is already created */
+ /* ...assume cursor created here... */
- mask = XCB_CWCURSOR;
- value_list = cursor;
- xcb_change_window_attributes (conn, window, mask, &value_list);
+ uint32_t mask = XCB_CWCURSOR;
+ uint32_t value_list = cursor;
+ xcb_change_window_attributes (connection, window, mask, &value_list);
Of course, the cursor and the font must be freed.
-### 17.3 Complete example
+### 3. Complete example
The following example displays a window with a button. When entering the window, the window cursor is changed to an arrow. When clicking once on the button, the cursor is changed to a hand. When clicking again on the button, the cursor window gets back to the arrow. The Esc key exits the application.
- #include <stdlib.h>
- #include <stdio.h>
- #include <string.h>
-
- #include <xcb/xcb.h>
-
- #define WIDTH 300
- #define HEIGHT 150
-
-
-
- static xcb_gc_t gc_font_get (xcb_connection_t *c,
- xcb_screen_t *screen,
- xcb_window_t window,
- const char *font_name);
-
- static void button_draw (xcb_connection_t *c,
- xcb_screen_t *screen,
- xcb_window_t window,
- int16_t x1,
- int16_t y1,
- const char *label);
-
- static void text_draw (xcb_connection_t *c,
- xcb_screen_t *screen,
- xcb_window_t window,
- int16_t x1,
- int16_t y1,
- const char *label);
-
- static void cursor_set (xcb_connection_t *c,
- xcb_screen_t *screen,
- xcb_window_t window,
- int cursor_id);
-
-
- static void
- button_draw (xcb_connection_t *c,
- xcb_screen_t *screen,
- xcb_window_t window,
- int16_t x1,
- int16_t y1,
- const char *label)
- {
- xcb_point_t points[5];
- xcb_void_cookie_t cookie_gc;
- xcb_void_cookie_t cookie_line;
- xcb_void_cookie_t cookie_text;
- xcb_generic_error_t *error;
- xcb_gcontext_t gc;
- int16_t width;
- int16_t height;
- uint8_t length;
- int16_t inset;
-
- length = strlen (label);
- inset = 2;
-
- gc = gc_font_get(c, screen, window, "7x13");
-
- width = 7 * length + 2 * (inset + 1);
- height = 13 + 2 * (inset + 1);
- 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;
- cookie_line = xcb_poly_line_checked (c, XCB_COORD_MODE_ORIGIN,
- window, gc, 5, points);
-
- error = xcb_request_check (c, cookie_line);
- if (error) {
- fprintf (stderr, "ERROR: can't draw lines : %d\n", error->error_code);
- xcb_disconnect (c);
- exit (-1);
- }
-
- cookie_text = xcb_image_text_8_checked (c, length, window, gc,
- x1 + inset + 1,
- y1 - inset - 1, label);
- error = xcb_request_check (c, cookie_text);
- if (error) {
- fprintf (stderr, "ERROR: can't paste text : %d\n", error->error_code);
- xcb_disconnect (c);
- exit (-1);
- }
-
- cookie_gc = xcb_free_gc (c, gc);
- error = xcb_request_check (c, cookie_gc);
- if (error) {
- fprintf (stderr, "ERROR: can't free gc : %d\n", error->error_code);
- xcb_disconnect (c);
- exit (-1);
- }
- }
-
- static void
- text_draw (xcb_connection_t *c,
- xcb_screen_t *screen,
- xcb_window_t window,
- int16_t x1,
- int16_t y1,
- const char *label)
- {
- xcb_void_cookie_t cookie_gc;
- xcb_void_cookie_t cookie_text;
- xcb_generic_error_t *error;
- xcb_gcontext_t gc;
- uint8_t length;
-
- length = strlen (label);
-
- gc = gc_font_get(c, screen, window, "7x13");
-
- cookie_text = xcb_image_text_8_checked (c, length, window, gc,
- x1,
- y1, label);
- error = xcb_request_check (c, cookie_text);
- if (error) {
- fprintf (stderr, "ERROR: can't paste text : %d\n", error->error_code);
- xcb_disconnect (c);
- exit (-1);
- }
-
- cookie_gc = xcb_free_gc (c, gc);
- error = xcb_request_check (c, cookie_gc);
- if (error) {
- fprintf (stderr, "ERROR: can't free gc : %d\n", error->error_code);
- xcb_disconnect (c);
- exit (-1);
- }
- }
-
- static xcb_gc_t
- gc_font_get (xcb_connection_t *c,
- xcb_screen_t *screen,
- xcb_window_t window,
- const char *font_name)
- {
- uint32_t value_list[3];
- xcb_void_cookie_t cookie_font;
- xcb_void_cookie_t cookie_gc;
- xcb_generic_error_t *error;
- xcb_font_t font;
- xcb_gcontext_t gc;
- uint32_t mask;
-
- font = xcb_generate_id (c);
- cookie_font = xcb_open_font_checked (c, font,
- strlen (font_name),
- font_name);
-
- error = xcb_request_check (c, cookie_font);
- if (error) {
- fprintf (stderr, "ERROR: can't open font : %d\n", error->error_code);
- xcb_disconnect (c);
- return -1;
- }
-
- gc = xcb_generate_id (c);
- mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND | XCB_GC_FONT;
- value_list[0] = screen->black_pixel;
- value_list[1] = screen->white_pixel;
- value_list[2] = font;
- cookie_gc = xcb_create_gc_checked (c, gc, window, mask, value_list);
- error = xcb_request_check (c, cookie_gc);
- if (error) {
- fprintf (stderr, "ERROR: can't create gc : %d\n", error->error_code);
- xcb_disconnect (c);
- exit (-1);
- }
-
- cookie_font = xcb_close_font_checked (c, font);
- error = xcb_request_check (c, cookie_font);
- if (error) {
- fprintf (stderr, "ERROR: can't close font : %d\n", error->error_code);
- xcb_disconnect (c);
- exit (-1);
- }
-
- return gc;
- }
-
- static void
- cursor_set (xcb_connection_t *c,
- xcb_screen_t *screen,
- xcb_window_t window,
- int cursor_id)
- {
- uint32_t values_list[3];
- xcb_void_cookie_t cookie_font;
- xcb_void_cookie_t cookie_gc;
- xcb_generic_error_t *error;
- xcb_font_t font;
- xcb_cursor_t cursor;
- xcb_gcontext_t gc;
- uint32_t mask;
- uint32_t value_list;
-
- font = xcb_generate_id (c);
- cookie_font = xcb_open_font_checked (c, font,
- strlen ("cursor"),
- "cursor");
- error = xcb_request_check (c, cookie_font);
- if (error) {
- fprintf (stderr, "ERROR: can't open font : %d\n", error->error_code);
- xcb_disconnect (c);
- exit (-1);
- }
-
- cursor = xcb_generate_id (c);
- xcb_create_glyph_cursor (c, cursor, font, font,
- cursor_id, cursor_id + 1,
- 0, 0, 0,
- 0, 0, 0);
-
- gc = xcb_generate_id (c);
- mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND | XCB_GC_FONT;
- values_list[0] = screen->black_pixel;
- values_list[1] = screen->white_pixel;
- values_list[2] = font;
- cookie_gc = xcb_create_gc_checked (c, gc, window, mask, values_list);
- error = xcb_request_check (c, cookie_gc);
- if (error) {
- fprintf (stderr, "ERROR: can't create gc : %d\n", error->error_code);
- xcb_disconnect (c);
- exit (-1);
- }
-
- mask = XCB_CW_CURSOR;
- value_list = cursor;
- xcb_change_window_attributes (c, window, mask, &value_list);
-
- xcb_free_cursor (c, cursor);
-
- cookie_font = xcb_close_font_checked (c, font);
- error = xcb_request_check (c, cookie_font);
- if (error) {
- fprintf (stderr, "ERROR: can't close font : %d\n", error->error_code);
- xcb_disconnect (c);
- exit (-1);
- }
- }
-
- int main ()
- {
- xcb_screen_iterator_t screen_iter;
- xcb_connection_t *c;
- const xcb_setup_t *setup;
- xcb_screen_t *screen;
- xcb_generic_event_t *e;
- xcb_generic_error_t *error;
- xcb_void_cookie_t cookie_window;
- xcb_void_cookie_t cookie_map;
- xcb_window_t window;
- uint32_t mask;
- uint32_t values[2];
- int screen_number;
- uint8_t is_hand = 0;
-
- /* getting the connection */
- c = xcb_connect (NULL, &screen_number);
- if (!c) {
- fprintf (stderr, "ERROR: can't connect to an X server\n");
- return -1;
- }
-
- /* getting the current screen */
- setup = xcb_get_setup (c);
-
- screen = NULL;
- screen_iter = xcb_setup_roots_iterator (setup);
- for (; screen_iter.rem != 0; --screen_number, xcb_screen_next (&screen_iter))
- if (screen_number == 0)
- {
- screen = screen_iter.data;
- break;
- }
- if (!screen) {
- fprintf (stderr, "ERROR: can't get the current screen\n");
- xcb_disconnect (c);
- return -1;
- }
-
- /* creating the window */
- window = xcb_generate_id (c);
- mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
- 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;
- cookie_window = xcb_create_window_checked (c,
- screen->root_depth,
- window, screen->root,
- 20, 200, WIDTH, HEIGHT,
- 0, XCB_WINDOW_CLASS_INPUT_OUTPUT,
- screen->root_visual,
- mask, values);
- cookie_map = xcb_map_window_checked (c, window);
-
- /* error managing */
- error = xcb_request_check (c, cookie_window);
- if (error) {
- fprintf (stderr, "ERROR: can't create window : %d\n", error->error_code);
- xcb_disconnect (c);
- return -1;
- }
- error = xcb_request_check (c, cookie_map);
- if (error) {
- fprintf (stderr, "ERROR: can't map window : %d\n", error->error_code);
- xcb_disconnect (c);
- return -1;
- }
-
- cursor_set (c, screen, window, 68);
-
- xcb_flush(c);
-
- while (1) {
- e = xcb_poll_for_event(c);
- if (e) {
- switch (e->response_type & ~0x80) {
- case XCB_EXPOSE: {
- char *text;
-
- text = "click here to change cursor";
- button_draw (c, screen, window,
- (WIDTH - 7 * strlen(text)) / 2,
- (HEIGHT - 16) / 2, text);
-
- text = "Press ESC key to exit...";
- text_draw (c, screen, window, 10, HEIGHT - 10, text);
- break;
- }
- case XCB_BUTTON_PRESS: {
- xcb_button_press_event_t *ev;
- int length;
-
- ev = (xcb_button_press_event_t *)e;
- length = strlen ("click here to change cursor");
-
- if ((ev->event_x >= (WIDTH - 7 * length) / 2) &&
- (ev->event_x <= ((WIDTH - 7 * length) / 2 + 7 * length + 6)) &&
- (ev->event_y >= (HEIGHT - 16) / 2 - 19) &&
- (ev->event_y <= ((HEIGHT - 16) / 2)))
- is_hand = 1 - is_hand;
-
- is_hand ? cursor_set (c, screen, window, 58) : cursor_set (c, screen, window, 68);
- }
- case XCB_KEY_RELEASE: {
- xcb_key_release_event_t *ev;
-
- ev = (xcb_key_release_event_t *)e;
-
- switch (ev->detail) {
- /* ESC */
- case 9:
- free (e);
- xcb_disconnect (c);
- return 0;
- }
- }
- }
- free (e);
- }
- }
-
- return 0;
- }
+ #include <stdlib.h>
+ #include <stdio.h>
+ #include <string.h>
+
+ #include <xcb/xcb.h>
+
+ #define WIDTH 300
+ #define HEIGHT 150
+
+
+ static xcb_gc_t
+ gc_font_get (xcb_connection_t *connection,
+ xcb_screen_t *screen,
+ xcb_window_t window,
+ const char *font_name );
+
+ static void
+ button_draw (xcb_connection_t *connection,
+ xcb_screen_t *screen,
+ xcb_window_t window,
+ int16_t x1,
+ int16_t y1,
+ const char *label );
+
+ static void
+ text_draw (xcb_connection_t *connection,
+ xcb_screen_t *screen,
+ xcb_window_t window,
+ int16_t x1,
+ int16_t y1,
+ const char *label );
+
+ static void
+ cursor_set (xcb_connection_t *connection,
+ xcb_screen_t *screen,
+ xcb_window_t window,
+ int cursor_id );
+
+
+ static void
+ button_draw (xcb_connection_t *connection,
+ xcb_screen_t *screen,
+ xcb_window_t window,
+ int16_t x1,
+ int16_t y1,
+ const char *label )
+ {
+ xcb_point_t points[5];
+ xcb_void_cookie_t cookie_gc;
+ xcb_void_cookie_t cookie_line;
+ xcb_void_cookie_t cookie_text;
+ xcb_generic_error_t *error;
+ xcb_gcontext_t gc;
+ int16_t width;
+ int16_t height;
+ uint8_t length;
+ int16_t inset;
+
+ length = strlen (label);
+ inset = 2;
+
+ gc = gc_font_get(c, screen, window, "7x13");
+
+ width = 7 * length + 2 * (inset + 1);
+ height = 13 + 2 * (inset + 1);
+ 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;
+ cookie_line = xcb_poly_line_checked (c, XCB_COORD_MODE_ORIGIN,
+ window, gc, 5, points);
+
+ error = xcb_request_check (c, cookie_line);
+ if (error) {
+ fprintf (stderr, "ERROR: can't draw lines : %d\n", error->error_code);
+ xcb_disconnect (c);
+ exit (-1);
+ }
+
+ cookie_text = xcb_image_text_8_checked (c, length, window, gc,
+ x1 + inset + 1,
+ y1 - inset - 1, label);
+
+ error = xcb_request_check (c, cookie_text);
+ if (error) {
+ fprintf (stderr, "ERROR: can't paste text : %d\n", error->error_code);
+ xcb_disconnect (c);
+ exit (-1);
+ }
+
+ cookie_gc = xcb_free_gc (c, gc);
+ error = xcb_request_check (c, cookie_gc);
+ if (error) {
+ fprintf (stderr, "ERROR: can't free gc : %d\n", error->error_code);
+ xcb_disconnect (c);
+ exit (-1);
+ }
+ }
+
+ /*
+ */
+ static void
+ text_draw (xcb_connection_t *connection,
+ xcb_screen_t *screen,
+ xcb_window_t window,
+ int16_t x1,
+ int16_t y1,
+ const char *label )
+ {
+ xcb_void_cookie_t cookie_gc;
+ xcb_void_cookie_t cookie_text;
+ xcb_generic_error_t *error;
+ xcb_gcontext_t gc;
+ uint8_t length;
+
+ length = strlen (label);
+
+ gc = gc_font_get(c, screen, window, "7x13");
+
+ cookie_text = xcb_image_text_8_checked (c, length, window, gc,
+ x1,
+ y1, label);
+ error = xcb_request_check (c, cookie_text);
+ if (error) {
+ fprintf (stderr, "ERROR: can't paste text : %d\n", error->error_code);
+ xcb_disconnect (c);
+ exit (-1);
+ }
+
+ cookie_gc = xcb_free_gc (c, gc);
+ error = xcb_request_check (c, cookie_gc);
+ if (error) {
+ fprintf (stderr, "ERROR: can't free gc : %d\n", error->error_code);
+ xcb_disconnect (c);
+ exit (-1);
+ }
+ }
+
+ /*
+ */
+ static xcb_gc_t
+ gc_font_get (xcb_connection_t *connection,
+ xcb_screen_t *screen,
+ xcb_window_t window,
+ const char *font_name )
+ {
+ uint32_t value_list[3];
+ xcb_void_cookie_t cookie_font;
+ xcb_void_cookie_t cookie_gc;
+ xcb_generic_error_t *error;
+ xcb_font_t font;
+ xcb_gcontext_t gc;
+ uint32_t mask;
+
+ font = xcb_generate_id (c);
+ cookie_font = xcb_open_font_checked (c, font,
+ strlen (font_name),
+ font_name);
+
+ error = xcb_request_check (c, cookie_font);
+ if (error) {
+ fprintf (stderr, "ERROR: can't open font : %d\n", error->error_code);
+ xcb_disconnect (c);
+ return -1;
+ }
+
+ gc = xcb_generate_id (c);
+ mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND | XCB_GC_FONT;
+ value_list[0] = screen->black_pixel;
+ value_list[1] = screen->white_pixel;
+ value_list[2] = font;
+ cookie_gc = xcb_create_gc_checked (c, gc, window, mask, value_list);
+ error = xcb_request_check (c, cookie_gc);
+ if (error) {
+ fprintf (stderr, "ERROR: can't create gc : %d\n", error->error_code);
+ xcb_disconnect (c);
+ exit (-1);
+ }
+
+ cookie_font = xcb_close_font_checked (c, font);
+ error = xcb_request_check (c, cookie_font);
+ if (error) {
+ fprintf (stderr, "ERROR: can't close font : %d\n", error->error_code);
+ xcb_disconnect (c);
+ exit (-1);
+ }
+
+ return gc;
+ }
+
+ /*
+ */
+ static void
+ cursor_set (xcb_connection_t *connection,
+ xcb_screen_t *screen,
+ xcb_window_t window,
+ int cursor_id )
+ {
+ uint32_t values_list[3];
+ xcb_void_cookie_t cookie_font;
+ xcb_void_cookie_t cookie_gc;
+ xcb_generic_error_t *error;
+ xcb_font_t font;
+ xcb_cursor_t cursor;
+ xcb_gcontext_t gc;
+ uint32_t mask;
+ uint32_t value_list;
+
+ font = xcb_generate_id (c);
+ cookie_font = xcb_open_font_checked (c, font,
+ strlen ("cursor"),
+ "cursor");
+ error = xcb_request_check (c, cookie_font);
+ if (error) {
+ fprintf (stderr, "ERROR: can't open font : %d\n", error->error_code);
+ xcb_disconnect (c);
+ exit (-1);
+ }
+
+ cursor = xcb_generate_id (c);
+ xcb_create_glyph_cursor (c, cursor, font, font,
+ cursor_id, cursor_id + 1,
+ 0, 0, 0,
+ 0, 0, 0);
+
+ gc = xcb_generate_id (c);
+ mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND | XCB_GC_FONT;
+ values_list[0] = screen->black_pixel;
+ values_list[1] = screen->white_pixel;
+ values_list[2] = font;
+ cookie_gc = xcb_create_gc_checked (c, gc, window, mask, values_list);
+ error = xcb_request_check (c, cookie_gc);
+ if (error) {
+ fprintf (stderr, "ERROR: can't create gc : %d\n", error->error_code);
+ xcb_disconnect (c);
+ exit (-1);
+ }
+
+ mask = XCB_CW_CURSOR;
+ value_list = cursor;
+ xcb_change_window_attributes (c, window, mask, &value_list);
+
+ xcb_free_cursor (c, cursor);
+
+ cookie_font = xcb_close_font_checked (c, font);
+ error = xcb_request_check (c, cookie_font);
+ if (error) {
+ fprintf (stderr, "ERROR: can't close font : %d\n", error->error_code);
+ xcb_disconnect (c);
+ exit (-1);
+ }
+ }
+
+ /*
+ */
+ int
+ main ()
+ {
+ xcb_screen_iterator_t screen_iter;
+ xcb_connection_t *c;
+ const xcb_setup_t *setup;
+ xcb_screen_t *screen;
+ xcb_generic_event_t *e;
+ xcb_generic_error_t *error;
+ xcb_void_cookie_t cookie_window;
+ xcb_void_cookie_t cookie_map;
+ xcb_window_t window;
+ uint32_t mask;
+ uint32_t values[2];
+ int screen_number;
+ uint8_t is_hand = 0;
+
+ /* getting the connection */
+ c = xcb_connect (NULL, &screen_number);
+ if (!c) {
+ fprintf (stderr, "ERROR: can't connect to an X server\n");
+ return -1;
+ }
+
+ /* getting the current screen */
+ setup = xcb_get_setup (c);
+
+ screen = NULL;
+ screen_iter = xcb_setup_roots_iterator (setup);
+ for (; screen_iter.rem != 0; --screen_number, xcb_screen_next (&screen_iter))
+ if (screen_number == 0)
+ {
+ screen = screen_iter.data;
+ break;
+ }
+ if (!screen) {
+ fprintf (stderr, "ERROR: can't get the current screen\n");
+ xcb_disconnect (c);
+ return -1;
+ }
+
+ /* creating the window */
+ window = xcb_generate_id (c);
+ mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
+ 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;
+ cookie_window = xcb_create_window_checked (c,
+ screen->root_depth,
+ window, screen->root,
+ 20, 200, WIDTH, HEIGHT,
+ 0, XCB_WINDOW_CLASS_INPUT_OUTPUT,
+ screen->root_visual,
+ mask, values);
+ cookie_map = xcb_map_window_checked (c, window);
+
+ /* error managing */
+ error = xcb_request_check (c, cookie_window);
+ if (error) {
+ fprintf (stderr, "ERROR: can't create window : %d\n", error->error_code);
+ xcb_disconnect (c);
+ return -1;
+ }
+ error = xcb_request_check (c, cookie_map);
+ if (error) {
+ fprintf (stderr, "ERROR: can't map window : %d\n", error->error_code);
+ xcb_disconnect (c);
+ return -1;
+ }
+
+ cursor_set (c, screen, window, 68);
+
+ xcb_flush(c);
+
+ while (1) {
+ e = xcb_poll_for_event(c);
+ if (e) {
+ switch (e->response_type & ~0x80) {
+ case XCB_EXPOSE: {
+ char *text;
+
+ text = "click here to change cursor";
+ button_draw (c, screen, window,
+ (WIDTH - 7 * strlen(text)) / 2,
+ (HEIGHT - 16) / 2, text);
+
+ text = "Press ESC key to exit...";
+ text_draw (c, screen, window, 10, HEIGHT - 10, text);
+ break;
+ }
+ case XCB_BUTTON_PRESS: {
+ xcb_button_press_event_t *ev;
+ int length;
+
+ ev = (xcb_button_press_event_t *)e;
+ length = strlen ("click here to change cursor");
+
+ if ((ev->event_x >= (WIDTH - 7 * length) / 2) &&
+ (ev->event_x <= ((WIDTH - 7 * length) / 2 + 7 * length + 6)) &&
+ (ev->event_y >= (HEIGHT - 16) / 2 - 19) &&
+ (ev->event_y <= ((HEIGHT - 16) / 2)))
+ is_hand = 1 - is_hand;
+
+ is_hand ? cursor_set (c, screen, window, 58) : cursor_set (c, screen, window, 68);
+ }
+ case XCB_KEY_RELEASE: {
+ xcb_key_release_event_t *ev = (xcb_key_release_event_t *)e;
+
+ switch (ev->detail) {
+ /* ESC */
+ case 9:
+ free (e);
+ xcb_disconnect (c);
+ return 0;
+ }
+ }
+ }
+ free (e);
+ }
+ }
+
+ return 0;
+ }
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