diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/dispextern.h | 1 | ||||
| -rw-r--r-- | src/window.c | 53 | ||||
| -rw-r--r-- | src/window.h | 2 | ||||
| -rw-r--r-- | src/xdisp.c | 104 |
4 files changed, 84 insertions, 76 deletions
diff --git a/src/dispextern.h b/src/dispextern.h index 51222e636be..eb71a82311c 100644 --- a/src/dispextern.h +++ b/src/dispextern.h @@ -3263,6 +3263,7 @@ void move_it_past_eol (struct it *); void move_it_in_display_line (struct it *it, ptrdiff_t to_charpos, int to_x, enum move_operation_enum op); +int partial_line_height (struct it *it_origin); bool in_display_vector_p (struct it *); int frame_mode_line_height (struct frame *); extern bool redisplaying_p; diff --git a/src/window.c b/src/window.c index bc3f488f37f..95690443f8e 100644 --- a/src/window.c +++ b/src/window.c @@ -4790,6 +4790,36 @@ window_scroll (Lisp_Object window, EMACS_INT n, bool whole, bool noerror) XWINDOW (window)->window_end_valid = false; } +/* Compute scroll margin for WINDOW. + We scroll when point is within this distance from the top or bottom + of the window. The result is measured in lines or in pixels + depending on the second parameter. */ +int +window_scroll_margin (struct window *window, enum margin_unit unit) +{ + if (scroll_margin > 0) + { + int frame_line_height = default_line_pixel_height (window); + int window_lines = window_box_height (window) / frame_line_height; + + double ratio = 0.25; + if (FLOATP (Vmaximum_scroll_margin)) + { + ratio = XFLOAT_DATA (Vmaximum_scroll_margin); + ratio = max (0.0, ratio); + ratio = min (ratio, 0.5); + } + int max_margin = min ((window_lines - 1)/2, + (int) (window_lines * ratio)); + int margin = clip_to_bounds (0, scroll_margin, max_margin); + return (unit == MARGIN_IN_PIXELS) + ? margin * frame_line_height + : margin; + } + else + return 0; +} + /* Implementation of window_scroll that works based on pixel line heights. See the comment of window_scroll for parameter @@ -4806,7 +4836,6 @@ window_scroll_pixel_based (Lisp_Object window, int n, bool whole, bool noerror) bool vscrolled = false; int x, y, rtop, rbot, rowh, vpos; void *itdata = NULL; - int window_total_lines; int frame_line_height = default_line_pixel_height (w); bool adjust_old_pointm = !NILP (Fequal (Fwindow_point (window), Fwindow_old_point (window))); @@ -5062,12 +5091,7 @@ window_scroll_pixel_based (Lisp_Object window, int n, bool whole, bool noerror) /* Move PT out of scroll margins. This code wants current_y to be zero at the window start position even if there is a header line. */ - window_total_lines - = w->total_lines * WINDOW_FRAME_LINE_HEIGHT (w) / frame_line_height; - this_scroll_margin = max (0, scroll_margin); - this_scroll_margin - = min (this_scroll_margin, window_total_lines / 4); - this_scroll_margin *= frame_line_height; + this_scroll_margin = window_scroll_margin (w, MARGIN_IN_PIXELS); if (n > 0) { @@ -5123,7 +5147,7 @@ window_scroll_pixel_based (Lisp_Object window, int n, bool whole, bool noerror) in the scroll margin at the bottom. */ move_it_to (&it, PT, -1, (it.last_visible_y - WINDOW_HEADER_LINE_HEIGHT (w) - - this_scroll_margin - 1), + - partial_line_height (&it) - this_scroll_margin - 1), -1, MOVE_TO_POS | MOVE_TO_Y); @@ -5290,9 +5314,7 @@ window_scroll_line_based (Lisp_Object window, int n, bool whole, bool noerror) if (pos < ZV) { - /* Don't use a scroll margin that is negative or too large. */ - int this_scroll_margin = - max (0, min (scroll_margin, w->total_lines / 4)); + int this_scroll_margin = window_scroll_margin (w, MARGIN_IN_LINES); set_marker_restricted_both (w->start, w->contents, pos, pos_byte); w->start_at_line_beg = !NILP (bolp); @@ -5722,8 +5744,7 @@ and redisplay normally--don't erase and redraw the frame. */) /* Do this after making BUF current in case scroll_margin is buffer-local. */ - this_scroll_margin - = max (0, min (scroll_margin, w->total_lines / 4)); + this_scroll_margin = window_scroll_margin (w, MARGIN_IN_LINES); /* Don't use redisplay code for initial frames, as the necessary data structures might not be set up yet then. */ @@ -5962,10 +5983,6 @@ from the top of the window. */) lines = displayed_window_lines (w); -#if false - this_scroll_margin = max (0, min (scroll_margin, lines / 4)); -#endif - if (NILP (arg)) XSETFASTINT (arg, lines / 2); else @@ -5981,6 +5998,8 @@ from the top of the window. */) it is probably better not to install it. However, it is here inside #if false so as not to lose it. -- rms. */ + this_scroll_margin = window_scroll_margin (w, MARGIN_IN_LINES); + /* Don't let it get into the margin at either top or bottom. */ iarg = max (iarg, this_scroll_margin); iarg = min (iarg, lines - this_scroll_margin - 1); diff --git a/src/window.h b/src/window.h index 061cf244943..acb8a5cabfa 100644 --- a/src/window.h +++ b/src/window.h @@ -1120,6 +1120,8 @@ extern bool compare_window_configurations (Lisp_Object, Lisp_Object, bool); extern void mark_window_cursors_off (struct window *); extern int window_internal_height (struct window *); extern int window_body_width (struct window *w, bool); +enum margin_unit { MARGIN_IN_LINES, MARGIN_IN_PIXELS }; +extern int window_scroll_margin (struct window *, enum margin_unit); extern void temp_output_buffer_show (Lisp_Object); extern void replace_buffer_in_windows (Lisp_Object); extern void replace_buffer_in_windows_safely (Lisp_Object); diff --git a/src/xdisp.c b/src/xdisp.c index 33661c882cd..0e329dfe6e9 100644 --- a/src/xdisp.c +++ b/src/xdisp.c @@ -9859,6 +9859,32 @@ move_it_by_lines (struct it *it, ptrdiff_t dvpos) } } +int +partial_line_height (struct it *it_origin) +{ + int partial_height; + void *it_data = NULL; + struct it it; + SAVE_IT (it, *it_origin, it_data); + move_it_to (&it, ZV, -1, it.last_visible_y, -1, + MOVE_TO_POS | MOVE_TO_Y); + if (it.what == IT_EOB) + { + int vis_height = it.last_visible_y - it.current_y; + int height = it.ascent + it.descent; + partial_height = (vis_height < height) ? vis_height : 0; + } + else + { + int last_line_y = it.current_y; + move_it_by_lines (&it, 1); + partial_height = (it.current_y > it.last_visible_y) + ? it.last_visible_y - last_line_y : 0; + } + RESTORE_IT (&it, &it, it_data); + return partial_height; +} + /* Return true if IT points into the middle of a display vector. */ bool @@ -15316,7 +15342,6 @@ try_scrolling (Lisp_Object window, bool just_this_one_p, bool temp_scroll_step, bool last_line_misfit) { struct window *w = XWINDOW (window); - struct frame *f = XFRAME (w->frame); struct text_pos pos, startp; struct it it; int this_scroll_margin, scroll_max, rc, height; @@ -15327,8 +15352,6 @@ try_scrolling (Lisp_Object window, bool just_this_one_p, /* We will never try scrolling more than this number of lines. */ int scroll_limit = SCROLL_LIMIT; int frame_line_height = default_line_pixel_height (w); - int window_total_lines - = WINDOW_TOTAL_LINES (w) * FRAME_LINE_HEIGHT (f) / frame_line_height; #ifdef GLYPH_DEBUG debug_method_add (w, "try_scrolling"); @@ -15336,13 +15359,7 @@ try_scrolling (Lisp_Object window, bool just_this_one_p, SET_TEXT_POS_FROM_MARKER (startp, w->start); - /* Compute scroll margin height in pixels. We scroll when point is - within this distance from the top or bottom of the window. */ - if (scroll_margin > 0) - this_scroll_margin = min (scroll_margin, window_total_lines / 4) - * frame_line_height; - else - this_scroll_margin = 0; + this_scroll_margin = window_scroll_margin (w, MARGIN_IN_PIXELS); /* Force arg_scroll_conservatively to have a reasonable value, to avoid scrolling too far away with slow move_it_* functions. Note @@ -15377,7 +15394,8 @@ try_scrolling (Lisp_Object window, bool just_this_one_p, /* Compute the pixel ypos of the scroll margin, then move IT to either that ypos or PT, whichever comes first. */ start_display (&it, w, startp); - scroll_margin_y = it.last_visible_y - this_scroll_margin + scroll_margin_y = it.last_visible_y - partial_line_height (&it) + - this_scroll_margin - frame_line_height * extra_scroll_margin_lines; move_it_to (&it, PT, -1, scroll_margin_y - 1, -1, (MOVE_TO_POS | MOVE_TO_Y)); @@ -15816,23 +15834,12 @@ try_cursor_movement (Lisp_Object window, struct text_pos startp, { int this_scroll_margin, top_scroll_margin; struct glyph_row *row = NULL; - int frame_line_height = default_line_pixel_height (w); - int window_total_lines - = WINDOW_TOTAL_LINES (w) * FRAME_LINE_HEIGHT (f) / frame_line_height; #ifdef GLYPH_DEBUG debug_method_add (w, "cursor movement"); #endif - /* Scroll if point within this distance from the top or bottom - of the window. This is a pixel value. */ - if (scroll_margin > 0) - { - this_scroll_margin = min (scroll_margin, window_total_lines / 4); - this_scroll_margin *= frame_line_height; - } - else - this_scroll_margin = 0; + this_scroll_margin = window_scroll_margin (w, MARGIN_IN_PIXELS); top_scroll_margin = this_scroll_margin; if (WINDOW_WANTS_HEADER_LINE_P (w)) @@ -16280,7 +16287,7 @@ redisplay_window (Lisp_Object window, bool just_this_one_p) int centering_position = -1; bool last_line_misfit = false; ptrdiff_t beg_unchanged, end_unchanged; - int frame_line_height; + int frame_line_height, margin; bool use_desired_matrix; void *itdata = NULL; @@ -16310,6 +16317,8 @@ redisplay_window (Lisp_Object window, bool just_this_one_p) restart: reconsider_clip_changes (w); frame_line_height = default_line_pixel_height (w); + margin = window_scroll_margin (w, MARGIN_IN_LINES); + /* Has the mode line to be updated? */ update_mode_line = (w->update_mode_line @@ -16614,10 +16623,7 @@ redisplay_window (Lisp_Object window, bool just_this_one_p) /* Some people insist on not letting point enter the scroll margin, even though this part handles windows that didn't scroll at all. */ - int window_total_lines - = WINDOW_TOTAL_LINES (w) * FRAME_LINE_HEIGHT (f) / frame_line_height; - int margin = min (scroll_margin, window_total_lines / 4); - int pixel_margin = margin * frame_line_height; + int pixel_margin = margin * frame_line_height; bool header_line = WINDOW_WANTS_HEADER_LINE_P (w); /* Note: We add an extra FRAME_LINE_HEIGHT, because the loop @@ -16901,12 +16907,6 @@ redisplay_window (Lisp_Object window, bool just_this_one_p) it.current_y = it.last_visible_y; if (centering_position < 0) { - int window_total_lines - = WINDOW_TOTAL_LINES (w) * FRAME_LINE_HEIGHT (f) / frame_line_height; - int margin - = scroll_margin > 0 - ? min (scroll_margin, window_total_lines / 4) - : 0; ptrdiff_t margin_pos = CHARPOS (startp); Lisp_Object aggressive; bool scrolling_up; @@ -17150,10 +17150,6 @@ redisplay_window (Lisp_Object window, bool just_this_one_p) { int window_total_lines = WINDOW_TOTAL_LINES (w) * FRAME_LINE_HEIGHT (f) / frame_line_height; - int margin = - scroll_margin > 0 - ? min (scroll_margin, window_total_lines / 4) - : 0; bool move_down = w->cursor.vpos >= window_total_lines / 2; move_it_by_lines (&it, move_down ? margin + 1 : -(margin + 1)); @@ -17359,7 +17355,6 @@ try_window (Lisp_Object window, struct text_pos pos, int flags) struct it it; struct glyph_row *last_text_row = NULL; struct frame *f = XFRAME (w->frame); - int frame_line_height = default_line_pixel_height (w); /* Make POS the new window start. */ set_marker_both (w->start, Qnil, CHARPOS (pos), BYTEPOS (pos)); @@ -17385,17 +17380,7 @@ try_window (Lisp_Object window, struct text_pos pos, int flags) if ((flags & TRY_WINDOW_CHECK_MARGINS) && !MINI_WINDOW_P (w)) { - int this_scroll_margin; - int window_total_lines - = WINDOW_TOTAL_LINES (w) * FRAME_LINE_HEIGHT (f) / frame_line_height; - - if (scroll_margin > 0) - { - this_scroll_margin = min (scroll_margin, window_total_lines / 4); - this_scroll_margin *= frame_line_height; - } - else - this_scroll_margin = 0; + int this_scroll_margin = window_scroll_margin (w, MARGIN_IN_PIXELS); if ((w->cursor.y >= 0 /* not vscrolled */ && w->cursor.y < this_scroll_margin @@ -18679,15 +18664,8 @@ try_window_id (struct window *w) /* Don't let the cursor end in the scroll margins. */ { - int this_scroll_margin, cursor_height; - int frame_line_height = default_line_pixel_height (w); - int window_total_lines - = WINDOW_TOTAL_LINES (w) * FRAME_LINE_HEIGHT (it.f) / frame_line_height; - - this_scroll_margin = - max (0, min (scroll_margin, window_total_lines / 4)); - this_scroll_margin *= frame_line_height; - cursor_height = MATRIX_ROW (w->desired_matrix, w->cursor.vpos)->height; + int this_scroll_margin = window_scroll_margin (w, MARGIN_IN_PIXELS); + int cursor_height = MATRIX_ROW (w->desired_matrix, w->cursor.vpos)->height; if ((w->cursor.y < this_scroll_margin && CHARPOS (start) > BEGV) @@ -31569,6 +31547,14 @@ Recenter the window whenever point gets within this many lines of the top or bottom of the window. */); scroll_margin = 0; + DEFVAR_LISP ("maximum-scroll-margin", Vmaximum_scroll_margin, + doc: /* Maximum effective value of `scroll-margin'. +Given as a fraction of the current window's lines. The value should +be a floating point number between 0.0 and 0.5. The effective maximum +is limited to (/ (1- window-lines) 2). Non-float values for this +variable are ignored and the default 0.25 is used instead. */); + Vmaximum_scroll_margin = make_float (0.25); + DEFVAR_LISP ("display-pixels-per-inch", Vdisplay_pixels_per_inch, doc: /* Pixels per inch value for non-window system displays. Value is a number or a cons (WIDTH-DPI . HEIGHT-DPI). */); |