Getting mouse clicks on xterm.

xterm_get_mouse_click_and_chars.c

#include <sys/ioctl.h>
#include <stdio.h>
#include <unistd.h>
#include <termios.h>

enum {
	KEYSTATE_NONE = 1024,
	KEYSTATE_ESCAPE,
	KEYSTATE_CONTROL,
	KEYSTATE_MOUSE_PROPS
};

enum {
	KEYSTATE_MOUSE_PRESSED,
	KEYSTATE_MOUSE_RELEASED,
	KEYSTATE_MOUSE_GOT_STATE,
	KEYSTATE_MOUSE_GOT_X,
	KEYSTATE_MOUSE_GOT_Y
};

int mygetch(void)
{
    struct termios oldt,newt;
    int ch;
    tcgetattr( STDIN_FILENO, &oldt );
    newt = oldt;
    newt.c_lflag &= ~( ICANON | ECHO );
    tcsetattr( STDIN_FILENO, TCSANOW, &newt );
    ch = getchar();
    tcsetattr( STDIN_FILENO, TCSANOW, &oldt );
    return ch;
}


int get_terminal_width(){
	struct winsize w;
	ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
	return w.ws_col;
}

int get_terminal_height(){
	struct winsize w;
	ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
	return w.ws_row;
}

int twidth, theight;
int mouse_state, mouse_x, mouse_y;

int main() {
	twidth  = get_terminal_width();
	theight = get_terminal_height()-5;
	
	printf("\033[?1000h");
	//printf("\033[?1006h");
	//printf("\e]12;black\a");
	
	printf ("lines %d\n", get_terminal_height());
	printf ("columns \e[41m%d\e[0m\n", get_terminal_width());
	
	char c;
	int special=KEYSTATE_NONE;
	
	while (c = mygetch()) {
		if (special == KEYSTATE_NONE && c == 27) { special = KEYSTATE_ESCAPE; continue; }
		if (special == KEYSTATE_ESCAPE && c == 91) { special = KEYSTATE_CONTROL; continue; }
		if (special == KEYSTATE_CONTROL) switch (c) {
			case 'A': printf("up\n");		special = KEYSTATE_NONE;	continue; break;
			case 'B': printf("down \n");	special = KEYSTATE_NONE;	continue; break;
			case 'D': printf("right\n");	special = KEYSTATE_NONE;	continue; break;
			case 'C': printf("left\n");	special = KEYSTATE_NONE;	continue; break;
		}
		
		if (c == 'M') { printf("mouse ");	special = KEYSTATE_MOUSE_PROPS; continue;}
		
		if (special==KEYSTATE_MOUSE_PROPS) { 
			if (c == 32) mouse_state = KEYSTATE_MOUSE_PRESSED;
			if (c == 35) mouse_state = KEYSTATE_MOUSE_RELEASED;
			special = KEYSTATE_MOUSE_GOT_STATE;
			continue; 
		}
		
		if (special==KEYSTATE_MOUSE_GOT_STATE) {
			mouse_x = c - 32;
			if (mouse_x < 0) mouse_x += 255;
			special = KEYSTATE_MOUSE_GOT_X;
			continue;
		}
		
		if (special==KEYSTATE_MOUSE_GOT_X) {
			mouse_y = c - 32;
			if (mouse_y < 0) mouse_y += 255;
			special = KEYSTATE_MOUSE_GOT_Y;
		}
		
		if (special == KEYSTATE_MOUSE_GOT_Y) {
			special = KEYSTATE_NONE;
			printf("Mouse: STATE=%d\tX=%d\tY=%d\n", mouse_state, mouse_x, mouse_y);
			continue;
		}
		
		printf("Char is ");
		if (c>='A') printf("%c (", c);
		printf("%d", c);
		if (c>='A') printf(")");
		printf("\n");
    }
    printf("\n");
	
	return 0;
}