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top: normalize vertical scrolling for hidden processes

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To my knowledge, nobody has ever complained about some
anomalies when scrolling vertically if tasks should be
hidden from view. This can happen with the user filter
('u/U') or other filter ('o/O') features. And although
some tasks are not shown, they still impact scrolling.

This is most apparent when that scroll coordinates msg
is on ('C') & up/down arrow keys used (vs. pgup/pgdn).

Now that we can collapse/expand forked children, there
is a potential for yet more of those hidden processes.

So this commit normalizes vertical scrolling providing
an expected behavior. In other words, the up/down keys
skip the unseen tasks to reposition on a visible task.

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner 2018-06-20 00:00:00 -05:00 committed by Craig Small
parent a8dc1a6e5a
commit 6aedeac667
2 changed files with 61 additions and 16 deletions
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73
top/top.c
View File

@ -3919,9 +3919,9 @@ static void win_names (WIN_t *q, const char *name) {
static void win_reset (WIN_t *q) {
SETw(q, Show_IDLEPS | Show_TASKON);
#ifndef SCROLLVAR_NO
q->rc.maxtasks = q->usrseltyp = q->begpflg = q->begtask = q->varcolbeg = 0;
q->rc.maxtasks = q->usrseltyp = q->begpflg = q->begtask = q->begnext = q->varcolbeg = 0;
#else
q->rc.maxtasks = q->usrseltyp = q->begpflg = q->begtask = 0;
q->rc.maxtasks = q->usrseltyp = q->begpflg = q->begtask = q->begnext = 0;
#endif
Monpidsidx = 0;
osel_clear(q);
@ -4408,7 +4408,7 @@ static void find_string (int ch) {
#endif
}
if (Curwin->findstr[0]) {
SETw(Curwin, INFINDS_xxx);
SETw(Curwin, NOPRINT_xxx);
for (i = Curwin->begtask; i < PIDSmaxt; i++) {
const char *row = task_show(Curwin, Curwin->ppt[i]);
if (*row && -1 < find_ofs(Curwin, row)) {
@ -4990,10 +4990,10 @@ static void keys_window (int ch) {
}
break;
case kbd_UP:
if (VIZCHKw(w)) if (CHKw(w, Show_IDLEPS) && 0 < w->begtask) w->begtask -= 1;
if (VIZCHKw(w)) if (CHKw(w, Show_IDLEPS)) w->begnext = -1;
break;
case kbd_DOWN:
if (VIZCHKw(w)) if (CHKw(w, Show_IDLEPS) && (w->begtask < PIDSmaxt - 1)) w->begtask += 1;
if (VIZCHKw(w)) if (CHKw(w, Show_IDLEPS)) w->begnext = +1;
break;
#ifdef USE_X_COLHDR // ------------------------------------
case kbd_LEFT:
@ -5063,17 +5063,14 @@ static void keys_window (int ch) {
case kbd_PGUP:
if (VIZCHKw(w)) {
if (CHKw(w, Show_IDLEPS) && 0 < w->begtask) {
w->begtask -= (w->winlines - 1);
if (0 > w->begtask) w->begtask = 0;
w->begnext = -(w->winlines - 1);
}
}
break;
case kbd_PGDN:
if (VIZCHKw(w)) {
if (CHKw(w, Show_IDLEPS) && w->begtask < PIDSmaxt - 1) {
w->begtask += (w->winlines - 1);
if (w->begtask > PIDSmaxt - 1) w->begtask = PIDSmaxt - 1;
if (0 > w->begtask) w->begtask = 0;
w->begnext = +(w->winlines - 1);
}
}
break;
@ -5087,8 +5084,7 @@ static void keys_window (int ch) {
case kbd_END:
if (VIZCHKw(w)) {
if (CHKw(w, Show_IDLEPS)) {
w->begtask = (PIDSmaxt - w->winlines) + 1;
if (0 > w->begtask) w->begtask = 0;
w->begnext = (PIDSmaxt - w->winlines) + 1;
w->begpflg = w->endpflg;
#ifndef SCROLLVAR_NO
w->varcolbeg = 0;
@ -5507,7 +5503,7 @@ static const char *task_show (const WIN_t *q, struct pids_stack *p) {
case EU_XOF:
case EU_XON:
cp = NULL;
if (!CHKw(q, INFINDS_xxx | NOHIFND_xxx | NOHISEL_xxx)) {
if (!CHKw(q, NOPRINT_xxx | NOHIFND_xxx | NOHISEL_xxx)) {
/* treat running tasks specially - entire row may get highlighted
so we needn't turn it on and we MUST NOT turn it off */
if (!('R' == rSv(EU_STA, s_ch) && CHKw(q, Show_HIROWS)))
@ -5662,7 +5658,7 @@ static const char *task_show (const WIN_t *q, struct pids_stack *p) {
#undef Jn
} // end: for 'maxpflgs'
if (!CHKw(q, INFINDS_xxx)) {
if (!CHKw(q, NOPRINT_xxx)) {
const char *cap = ((CHKw(q, Show_HIROWS) && 'R' == rSv(EU_STA, s_ch)))
? q->capclr_rowhigh : q->capclr_rownorm;
char *row = rbuf;
@ -5693,6 +5689,51 @@ static const char *task_show (const WIN_t *q, struct pids_stack *p) {
} // end: task_show
/*
* A window_show *Helper* function ensuring that Curwin's 'begtask'
* represents a visible process (not any hidden/filtered-out task).
* In reality, this function is called:
* 1) exclusively for the current window
* 2) immediately after interacting with a user
* 3) with the only key stuck: up, down, pgup, pgdn or end */
static void window_hlp (void) {
WIN_t *w = Curwin; // avoid gcc bloat with a local copy
int i;
SETw(w, NOPRINT_xxx);
w->begtask += w->begnext;
if (w->begtask < 0) w->begtask = 0;
if (w->begtask >= PIDSmaxt) w->begtask = PIDSmaxt - 1;
// potentially scroll forward ...
if (w->begnext > 0) {
for (i = w->begtask; i < PIDSmaxt; i++) {
if (wins_usrselect(w, w->ppt[i])
&& (*task_show(w, w->ppt[i])))
break;
}
if (i < PIDSmaxt) {
w->begtask = i;
goto wrap_up;
}
// no luck forward, so let's try backward
w->begtask = PIDSmaxt - 1;
}
// potentially scroll backward ...
for (i = w->begtask; i > 0; i--) {
if (wins_usrselect(w, w->ppt[i])
&& (*task_show(w, w->ppt[i])))
break;
}
w->begtask = i;
wrap_up:
w->begnext = 0;
OFFw(w, NOPRINT_xxx);
} // end: window_hlp
static int window_show (WIN_t *q, int wmax) {
#define sORDER CHKw(q, Qsrt_NORMAL) ? PIDS_SORT_DESCEND : PIDS_SORT_ASCEND
/* the isBUSY macro determines if a task is 'active' --
@ -5717,6 +5758,9 @@ static int window_show (WIN_t *q, int wmax) {
error_exit(fmtmk(N_fmt(LIB_errorpid_fmt),__LINE__, strerror(errno)));
}
if (q->begnext) window_hlp();
else OFFw(q, NOPRINT_xxx);
i = q->begtask;
lwin = 1; // 1 for the column header
wmax = winMIN(wmax, q->winlines + 1); // ditto for winlines, too
@ -5807,7 +5851,6 @@ static void frame_make (void) {
Tree_idx = Pseudo_row = Msg_row = scrlins = 0;
summary_show();
Max_lines = (Screen_rows - Msg_row) - 1;
OFFw(w, INFINDS_xxx);
// we're now on Msg_row so clear out any residual messages ...
putp(Cap_clr_eol);

4
top/top.h
View File

@ -245,7 +245,7 @@ typedef long long SIC_t;
#define Show_JRSTRS 0x040000 // 'j' - right justify "string" data cols
#define Show_JRNUMS 0x020000 // 'J' - right justify "numeric" data cols
// these flag(s) have no command as such - they're for internal use
#define INFINDS_xxx 0x010000 // build rows for find_string, not display
#define NOPRINT_xxx 0x010000 // build task rows only (not for display)
#define EQUWINS_xxx 0x000001 // rebalance all wins & tasks (off i,n,u/U)
#ifndef USE_X_COLHDR
#define NOHISEL_xxx 0x200000 // restrict Show_HICOLS for osel temporarily
@ -325,6 +325,7 @@ typedef struct WIN_t {
begpflg, // scrolled beginning pos into pflgsall array
endpflg, // scrolled ending pos into pflgsall array
begtask, // scrolled beginning pos into total tasks
begnext, // new scrolled delta for next frame's begtask
#ifndef SCROLLVAR_NO
varcolbeg, // scrolled position within variable width col
#endif
@ -665,6 +666,7 @@ typedef struct WIN_t {
//atic void summary_hlp (struct stat_stack *this, const char *pfx);
//atic void summary_show (void);
//atic const char *task_show (const WIN_t *q, struct pids_stack *p);
//atic void window_hlp (void);
//atic int window_show (WIN_t *q, int wmax);
/*------ Entry point plus two ------------------------------------------*/
//atic void frame_hlp (int wix, int max);