In the attached program, I've encountered two surprises.
1. ungetmouse() seems to work only once. Once I've retrieved the two
event I push onto the mouse event stack by typing 'z', my loop stops
behaving as I expect. Typing 'z' 3 times, I get:
16777216 524288 X X X X X X
(The integers are the values of get bstate member of the MEVENT
struct; "X" means that getmouse() returned ERR, that is, the mouse
event stack was empty.)
2. Multiple-clicking with a long mouse interval (set here to 1 second)
does not work as I expect. Here is what I see if I:
Left-triple-click then left-single-click within the interval, then
Left-triple-click then left-double-click within the interval, then
Left-triple-click then left-triple-click within the interval.
4 16 X 4 16 X 4 16 X
I expected either:
(a) the click count to "saturate" within the interval, and return
only BUTTON1_TRIPLE_CLICKED (16); or
(b) to receive one event of each kind, which only met my
expectations in the first case. So in that scenario I expected:
4 16 X 8 16 X 16 X
Can someone elucidate the model I should have in my head? It sounds
like I have the wrong one.
If it matters, I'm using stock ncurses v6_5_20250628 and XTerm(395) with
TERM=xterm-256color.
Regards,
Branden
#include <locale.h> // setlocale()
#include <stdlib.h> // EXIT_SUCCESS, exit()
#include <string.h> // strlen()
#include <curses.h>
int main(void) {
setlocale(LC_ALL, "");
initscr();
cbreak();
noecho();
intrflush(stdscr, FALSE);
keypad(stdscr, TRUE);
if (mousemask(ALL_MOUSE_EVENTS, NULL) == 0) {
endwin();
fputs("Mouse doesn't support any events.\n", stderr);
exit(EXIT_SUCCESS);
}
if (!has_mouse()) {
endwin();
fputs("No mouse is available.\n", stderr);
exit(EXIT_SUCCESS);
}
mouseinterval(1000);
char const message[] = "Oneko! Press 'q' to quit.";
(void) move((LINES / 2), ((COLS - strlen(message))/ 2));
(void) addstr(message);
(void) refresh();
(void) addch('\n');
int ch;
MEVENT evt;
while (TRUE) {
evt.bstate = 0;
ch = getch();
if ('q' == ch) {
break;
}
if (KEY_MOUSE == ch) {
while (getmouse(&evt) != ERR) {
(void) printw("%d ", evt.bstate);
}
(void) addstr("X ");
(void) refresh();
}
if ('z' == ch) {
evt.bstate = BUTTON4_TRIPLE_CLICKED;
if (ungetmouse(&evt) == ERR) {
(void) addstr("YYY ");
}
evt.bstate = BUTTON5_TRIPLE_CLICKED;
if (ungetmouse(&evt) == ERR) {
(void) addstr("ZZZ ");
}
}
}
endwin();
fprintf(stderr, "This has been a demo of ncurses mouse protocol"
" %d.\n", NCURSES_MOUSE_VERSION);
}
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