From 62285bb2debd7226110df94f8971df0e97efe672 Mon Sep 17 00:00:00 2001 From: Po Lu Date: Tue, 16 Nov 2021 19:39:50 +0800 Subject: [PATCH] Expose pixel-wise wheel events to Lisp * doc/lispref/commands.texi (Misc Events): Document changes to wheel events. * src/keyboard.c (make_lispy_event): Handle wheel events with pixel delta data. * src/termhooks.h (WHEEL_EVENT): Document changes to WHEEL_EVENT args. * src/xfns.c (syms_of_xfns): Declare new symbols. * src/xterm.c (handle_one_xevent): Give wheel events pixel delta data. (x_coalesce_scroll_events): New user option. --- doc/lispref/commands.texi | 5 ++++- src/keyboard.c | 6 +++++- src/termhooks.h | 5 ++++- src/xfns.c | 1 + src/xterm.c | 41 ++++++++++++++++++++++++++++----------- 5 files changed, 44 insertions(+), 14 deletions(-) diff --git a/doc/lispref/commands.texi b/doc/lispref/commands.texi index 1509c200e0..a32548e9d5 100644 --- a/doc/lispref/commands.texi +++ b/doc/lispref/commands.texi @@ -1985,7 +1985,10 @@ Misc Events These kinds of event are generated by moving a mouse wheel. The @var{position} element is a mouse position list (@pxref{Click Events}), specifying the position of the mouse cursor when the event -occurred. +occurred. The event may have additional arguments after +@var{position}. The third argument after @var{position}, if present, +is a pair of the form @w{@code{(@var{x} . @var{y})}}, where @var{x} +and @var{y} are the number of pixels to scroll by in each axis. @vindex mouse-wheel-up-event @vindex mouse-wheel-down-event diff --git a/src/keyboard.c b/src/keyboard.c index c3bc8307d7..0c48790ce8 100644 --- a/src/keyboard.c +++ b/src/keyboard.c @@ -5980,7 +5980,11 @@ make_lispy_event (struct input_event *event) ASIZE (wheel_syms)); } - if (NUMBERP (event->arg)) + if (CONSP (event->arg)) + return list5 (head, position, make_fixnum (double_click_count), + XCAR (event->arg), Fcons (XCAR (XCDR (event->arg)), + XCAR (XCDR (XCDR (event->arg))))); + else if (NUMBERP (event->arg)) return list4 (head, position, make_fixnum (double_click_count), event->arg); else if (event->modifiers & (double_modifier | triple_modifier)) diff --git a/src/termhooks.h b/src/termhooks.h index e7539bbce2..b274be9e3c 100644 --- a/src/termhooks.h +++ b/src/termhooks.h @@ -119,7 +119,10 @@ #define EMACS_TERMHOOKS_H .timestamp gives a timestamp (in milliseconds) for the event. .arg may contain the number of - lines to scroll. */ + lines to scroll, or a list of + the form (NUMBER-OF-LINES . (X Y)) where + X and Y are the number of pixels + on each axis to scroll by. */ HORIZ_WHEEL_EVENT, /* A wheel event generated by a second horizontal wheel that is present on some mice. See WHEEL_EVENT. */ diff --git a/src/xfns.c b/src/xfns.c index b33b40b330..0ea43d1330 100644 --- a/src/xfns.c +++ b/src/xfns.c @@ -8085,6 +8085,7 @@ syms_of_xfns (void) #ifdef HAVE_XINPUT2 DEFSYM (Qxinput2, "xinput2"); + Fprovide (Qxinput2, Qnil); #endif diff --git a/src/xterm.c b/src/xterm.c index 63754a2cb6..ed3921f286 100644 --- a/src/xterm.c +++ b/src/xterm.c @@ -556,6 +556,7 @@ xi_reset_scroll_valuators_for_device_id (struct x_display_info *dpyinfo, int id) { valuator = &device->valuators[i]; valuator->invalid_p = true; + valuator->emacs_value = 0.0; } return; @@ -9921,8 +9922,6 @@ handle_one_xevent (struct x_display_info *dpyinfo, #endif goto XI_OTHER; case XI_Motion: - /* First test if there is some kind of scroll event - here! */ states = &xev->valuators; values = states->values; @@ -9932,10 +9931,8 @@ handle_one_xevent (struct x_display_info *dpyinfo, { if (XIMaskIsSet (states->mask, i)) { - block_input (); - struct xi_scroll_valuator_t *val; - double delta; + double delta, scroll_unit; delta = x_get_scroll_valuator_delta (dpyinfo, xev->deviceid, i, *values, &val); @@ -9943,6 +9940,7 @@ handle_one_xevent (struct x_display_info *dpyinfo, if (delta != DBL_MAX) { f = mouse_or_wdesc_frame (dpyinfo, xev->event); + scroll_unit = pow (FRAME_PIXEL_HEIGHT (f), 2.0 / 3.0); found_valuator = true; if (signbit (delta) != signbit (val->emacs_value)) @@ -9950,15 +9948,16 @@ handle_one_xevent (struct x_display_info *dpyinfo, val->emacs_value += delta; + if (x_coalesce_scroll_events + && (fabs (val->emacs_value) < 1)) + continue; + if (!f) { f = x_any_window_to_frame (dpyinfo, xev->event); if (!f) - { - unblock_input (); - goto XI_OTHER; - } + goto XI_OTHER; } bool s = signbit (val->emacs_value); @@ -9975,13 +9974,26 @@ handle_one_xevent (struct x_display_info *dpyinfo, inev.ie.modifiers |= x_x_to_emacs_modifiers (dpyinfo, xev->mods.effective); - inev.ie.arg = Qnil; + + if (val->horizontal) + { + inev.ie.arg + = list3 (Qnil, + make_float (val->emacs_value + * scroll_unit), + make_float (0)); + } + else + { + inev.ie.arg = list3 (Qnil, make_float (0), + make_float (val->emacs_value + * scroll_unit)); + } kbd_buffer_store_event_hold (&inev.ie, hold_quit); val->emacs_value = 0; } - unblock_input (); values++; } @@ -15048,4 +15060,11 @@ syms_of_xterm (void) consuming frame position adjustments. In newer versions of GTK, Emacs always uses gtk_window_move and ignores the value of this variable. */); x_gtk_use_window_move = true; + + DEFVAR_BOOL ("x-coalesce-scroll-events", x_coalesce_scroll_events, + doc: /* Non-nil means send a wheel event only for scrolling at least one screen line. +Otherwise, a wheel event will be sent every time the mouse wheel is +moved. This option is only effective when Emacs is built with XInput +2. */); + x_coalesce_scroll_events = true; } -- 2.31.1