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master 191aef4f618 1/3: Implement new option 'mouse-prefer-closest-glyph
From: |
Eli Zaretskii |
Subject: |
master 191aef4f618 1/3: Implement new option 'mouse-prefer-closest-glyph' |
Date: |
Sat, 22 Jul 2023 11:50:16 -0400 (EDT) |
branch: master
commit 191aef4f618408c1be9f57459eaaa91b955fec18
Author: Moritz Maxeiner <mm@ucw.sh>
Commit: Eli Zaretskii <eliz@gnu.org>
Implement new option 'mouse-prefer-closest-glyph'
* src/dispnew.c (mouse_prefer_closest_glyph): New global
variable.
(buffer_posn_from_coords):
* src/xdisp.c (remember_mouse_glyph): Respect
'mouse_prefer_closest_glyph'.
(mouse_fine_grained_tracking): Update documentation to
include 'mouse_prefer_closest_glyph' effects.
* doc/lispref/commands.texi (Accessing Mouse): Update
documentation to say what the new option does when enabled.
* lisp/cus-start.el (standard): New user option
'mouse-prefer-closest-glyph'.
---
doc/lispref/commands.texi | 10 ++++++++++
lisp/cus-start.el | 1 +
src/dispnew.c | 18 ++++++++++++++++++
src/xdisp.c | 17 ++++++++++++++++-
4 files changed, 45 insertions(+), 1 deletion(-)
diff --git a/doc/lispref/commands.texi b/doc/lispref/commands.texi
index 037f42124cc..ad7ba1e8a82 100644
--- a/doc/lispref/commands.texi
+++ b/doc/lispref/commands.texi
@@ -2756,6 +2756,16 @@ If @var{whole} is non-@code{nil}, the @var{x} coordinate
is relative
to the entire window area including scroll bars, margins and fringes.
@end defun
+@defopt mouse-prefer-closest-glyph
+If this variable is non-@code{nil}, the @code{posn-point} of a mouse
+position list will be set to the position of the glyph whose left most
+position is closest to the mouse pointer, as opposed to the position of
+the glyph underneath the mouse pointer itself. For example, if
+@code{posn-at-x-y} is called with @var{x} set to @code{9}, which is
+contained within a character of width 10 positioned at column 0, the
+point saved within the mouse position list will be after that character.
+@end defopt
+
@node Accessing Scroll
@subsection Accessing Scroll Bar Events
@cindex scroll bar events, data in
diff --git a/lisp/cus-start.el b/lisp/cus-start.el
index 6ca7d7fcafd..6d83aaf4d14 100644
--- a/lisp/cus-start.el
+++ b/lisp/cus-start.el
@@ -231,6 +231,7 @@ Leaving \"Default\" unchecked is equivalent with specifying
a default of
(inverse-video display boolean)
(visible-bell display boolean)
(no-redraw-on-reenter display boolean)
+ (mouse-prefer-closest-glyph display boolean)
;; doc.c
(text-quoting-style display
diff --git a/src/dispnew.c b/src/dispnew.c
index 82524d8cb8d..821357c51c1 100644
--- a/src/dispnew.c
+++ b/src/dispnew.c
@@ -5636,6 +5636,15 @@ buffer_posn_from_coords (struct window *w, int *x, int
*y, struct display_pos *p
argument is ZV to prevent move_it_in_display_line from matching
based on buffer positions. */
move_it_in_display_line (&it, ZV, to_x, MOVE_TO_X);
+ if (mouse_prefer_closest_glyph)
+ {
+ int next_x = it.current_x + it.pixel_width;
+ int before_dx = to_x - it.current_x;
+ int after_dx = next_x - to_x;
+ if (before_dx > after_dx)
+ move_it_in_display_line (&it, ZV, next_x, MOVE_TO_X);
+ }
+
bidi_unshelve_cache (itdata, 0);
Fset_buffer (old_current_buffer);
@@ -6813,6 +6822,15 @@ predicates which report frame's specific UI-related
capabilities. */);
DEFVAR_BOOL ("cursor-in-echo-area", cursor_in_echo_area,
doc: /* Non-nil means put cursor in minibuffer, at end of any
message there. */);
+ DEFVAR_BOOL ("mouse-prefer-closest-glyph", mouse_prefer_closest_glyph,
+ doc: /* Non-nil means mouse position lists are reported relative
+to the glyph closest to their coordinates.
+
+ When non-nil, mouse position lists will be reported with their
+`posn-point' set to the position of the glyph closest to the mouse
+pointer, instead of the glyph immediately under. */);
+ mouse_prefer_closest_glyph = false;
+
DEFVAR_LISP ("glyph-table", Vglyph_table,
doc: /* Table defining how to output a glyph code to the frame.
If not nil, this is a vector indexed by glyph code to define the glyph.
diff --git a/src/xdisp.c b/src/xdisp.c
index 2eba42e3d90..1de6fcfd172 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -2759,6 +2759,7 @@ remember_mouse_glyph (struct frame *f, int gx, int gy,
NativeRectangle *rect)
enum window_part part;
enum glyph_row_area area;
int x, y, width, height;
+ int original_gx;
if (mouse_fine_grained_tracking)
{
@@ -2769,6 +2770,8 @@ remember_mouse_glyph (struct frame *f, int gx, int gy,
NativeRectangle *rect)
/* Try to determine frame pixel position and size of the glyph under
frame pixel coordinates X/Y on frame F. */
+ original_gx = gx;
+
if (window_resize_pixelwise)
{
width = height = 1;
@@ -2984,6 +2987,15 @@ remember_mouse_glyph (struct frame *f, int gx, int gy,
NativeRectangle *rect)
gy += WINDOW_TOP_EDGE_Y (w);
store_rect:
+ if (mouse_prefer_closest_glyph)
+ {
+ int half_width = width / 2;
+ width = half_width;
+
+ int bisection = gx + half_width;
+ if (original_gx > bisection)
+ gx = bisection;
+ }
STORE_NATIVE_RECT (*rect, gx, gy, width, height);
/* Visible feedback for debugging. */
@@ -37503,7 +37515,10 @@ may be more familiar to users. */);
DEFVAR_BOOL ("mouse-fine-grained-tracking", mouse_fine_grained_tracking,
doc: /* Non-nil for pixel-wise mouse-movement.
When nil, mouse-movement events will not be generated as long as the
-mouse stays within the extent of a single glyph (except for images). */);
+mouse stays within the extent of a single glyph (except for images).
+When nil and mouse-prefer-closest-glyph is non-nil, mouse-movement
+events will instead not be generated as long as the mouse stays within
+the extent of a single left/right half glyph (except for images). */);
mouse_fine_grained_tracking = false;
DEFVAR_BOOL ("tab-bar--dragging-in-progress", tab_bar__dragging_in_progress,