patch/acme-moveto-undo/moveto.c


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#include <u.h>
#include <libc.h>
#include <draw.h>
#include <thread.h>
#include <cursor.h>
#include <mouse.h>
#include <keyboard.h>
#include <frame.h>
#include <fcall.h>
#include <plumb.h>
#include "dat.h"

static	Point		newmouse;
static	Point		oldmouse;

/* call moveto, but record old and new mouse positions */
void
recmoveto(Mousectl *mc, Point pt){
	static vlong prevtime = 0;
	vlong curtime = nsec();
	if(curtime-prevtime>500000000){ /* 500ms */
		newmouse = pt;
		oldmouse = mouse->xy;
	}
	prevtime = curtime;
	moveto(mc, pt);
}

void
undomoveto(Mousectl *mc){
	Point tmp;
	moveto(mc, oldmouse);
	tmp = newmouse;
	newmouse = oldmouse;
	oldmouse = tmp;
}