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xcb-demo-03.cpp
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xcb-demo-03.cpp
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// This is a sample program retyped from the libxcb tutorial here:
// http://www.x.org/releases/X11R7.7/doc/libxcb/tutorial/index.html
#include <cstdlib>
#include <cstdio>
#include <xcb/xcb.h>
void print_modifiers ( uint32_t mask ) {
const char ** mod, * mods[] = {
"Shift", "Lock", "Ctrl", "Alt",
"Mod2", "Mod3", "Mod4", "Mod5",
"Button1", "Button2", "Button3", "Button4", "Button5"
};
printf( "Modifier mask: " );
for ( mod = mods; mask; mask >>= 1, mod++ ) {
if ( mask & 1 ) {
fputs( *mod, stdout );
}
}
putchar( '\n' );
}
int main () {
xcb_connection_t *c;
xcb_screen_t *screen;
xcb_window_t win;
xcb_generic_event_t *e;
uint32_t mask = 0;
uint32_t values[2];
/* Open the connection to the X server */
c = xcb_connect( NULL, NULL );
/* Get the first screen */
screen = xcb_setup_roots_iterator( xcb_get_setup( c ) ).data;
/* Ask for our window's Id */
win = xcb_generate_id( c );
/* Create the window */
mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
values[0] = screen->white_pixel;
values[1] = XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS |
XCB_EVENT_MASK_BUTTON_RELEASE | XCB_EVENT_MASK_POINTER_MOTION |
XCB_EVENT_MASK_ENTER_WINDOW | XCB_EVENT_MASK_LEAVE_WINDOW |
XCB_EVENT_MASK_KEY_PRESS | XCB_EVENT_MASK_KEY_RELEASE;
xcb_create_window( c, /* connection */
0, /* depth */
win, /* window Id */
screen->root, /* parent window */
0, 0, /* x, y */
150, 150, /* width, height */
10, /* border_width */
XCB_WINDOW_CLASS_INPUT_OUTPUT, /* class */
screen->root_visual, /* visual */
mask, values /* masks */
);
/* Map the window on the screen */
xcb_map_window( c, win );
xcb_flush( c );
while ( ( e = xcb_wait_for_event( c ) ) ) {
switch ( e->response_type & ~0x80 ) {
case XCB_EXPOSE: {
xcb_expose_event_t *ev = (xcb_expose_event_t *) e;
printf( "Window %u exposed. Region to be redrawn at location (%d,%d)\n",
ev->window, ev->x, ev->y, ev->width, ev->height );
break;
}
case XCB_BUTTON_PRESS: {
xcb_button_press_event_t *ev = (xcb_button_press_event_t *) e;
print_modifiers( ev->state );
switch ( ev->detail ) {
case 4:
printf( "Wheel Button up in window %u, at coordinates (%d,%d)\n",
ev->event, ev->event_x, ev->event_y );
break;
case 5:
printf( "Wheel Button down in window %u at coordinates (%d,%d)\n",
ev->event, ev->event_x, ev->event_y );
break;
default:
printf( "Button %d pressed in window %u, at coordinates (%d,%d)\n",
ev->detail, ev->event, ev->event_x, ev->event_y );
break;
}
break;
}
case XCB_BUTTON_RELEASE: {
xcb_button_release_event_t *ev = (xcb_button_release_event_t *) e;
print_modifiers( ev->state );
printf( "Button %d released in window %u, at coordinates (%d,%d)\n",
ev->detail, ev->event, ev->event_x, ev->event_y );
break;
}
case XCB_MOTION_NOTIFY: {
xcb_motion_notify_event_t *ev = (xcb_motion_notify_event_t *) e;
printf( "Mouse moved in window %u, at coordinates (%d,%d)\n",
ev->event, ev->event_x, ev->event_y );
break;
}
case XCB_ENTER_NOTIFY: {
xcb_enter_notify_event_t *ev = (xcb_enter_notify_event_t *) e;
printf( "Mouse entered window %u, at coordinates (%d,%d)\n",
ev->event, ev->event_x, ev->event_y );
break;
}
case XCB_LEAVE_NOTIFY: {
xcb_leave_notify_event_t *ev = (xcb_leave_notify_event_t *) e;
printf( "Mouse left window %u, at coordinates (%d,%d)\n",
ev->event, ev->event_x, ev->event_y );
break;
}
case XCB_KEY_PRESS: {
xcb_key_press_event_t *ev = (xcb_key_press_event_t *) e;
print_modifiers( ev->state );
printf( "Key %u pressed in window %u\n", ev->detail, ev->event );
break;
}
case XCB_KEY_RELEASE: {
xcb_key_release_event_t *ev = (xcb_key_release_event_t *) e;
print_modifiers( ev->state );
printf( "Key %u released in window %u\n", ev->detail, ev->event );
break;
}
default: {
/* Unknown event type, ignore it */
printf( "Unknown event: %d\n", e->response_type );
break;
}
}
/* Free the Generic Event */
free( e );
}
return 0;
}