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Diffstat (limited to 'src/move.c')
| -rw-r--r-- | src/move.c | 3657 |
1 files changed, 3657 insertions, 0 deletions
diff --git a/src/move.c b/src/move.c new file mode 100644 index 0000000..861d84b --- /dev/null +++ b/src/move.c @@ -0,0 +1,3657 @@ +/* vi:set ts=8 sts=4 sw=4 noet: + * + * VIM - Vi IMproved by Bram Moolenaar + * + * Do ":help uganda" in Vim to read copying and usage conditions. + * Do ":help credits" in Vim to see a list of people who contributed. + * See README.txt for an overview of the Vim source code. + */ +/* + * move.c: Functions for moving the cursor and scrolling text. + * + * There are two ways to move the cursor: + * 1. Move the cursor directly, the text is scrolled to keep the cursor in the + * window. + * 2. Scroll the text, the cursor is moved into the text visible in the + * window. + * The 'scrolloff' option makes this a bit complicated. + */ + +#include "vim.h" + +static int scrolljump_value(void); +static int check_top_offset(void); +static void curs_rows(win_T *wp); + +typedef struct +{ + linenr_T lnum; // line number +#ifdef FEAT_DIFF + int fill; // filler lines +#endif + int height; // height of added line +} lineoff_T; + +static void topline_back(lineoff_T *lp); +static void botline_forw(lineoff_T *lp); + +/* + * Get the number of screen lines skipped with "wp->w_skipcol". + */ + int +adjust_plines_for_skipcol(win_T *wp) +{ + if (wp->w_skipcol == 0) + return 0; + + int width = wp->w_width - win_col_off(wp); + int w2 = width + win_col_off2(wp); + if (wp->w_skipcol >= width && w2 > 0) + return (wp->w_skipcol - width) / w2 + 1; + + return 0; +} + +/* + * Return how many lines "lnum" will take on the screen, taking into account + * whether it is the first line, whether w_skipcol is non-zero and limiting to + * the window height. + */ + static int +plines_correct_topline(win_T *wp, linenr_T lnum) +{ + int n; +#ifdef FEAT_DIFF + if (lnum == wp->w_topline) + n = plines_win_nofill(wp, lnum, FALSE) + wp->w_topfill; + else +#endif + n = plines_win(wp, lnum, FALSE); + if (lnum == wp->w_topline) + n -= adjust_plines_for_skipcol(wp); + if (n > wp->w_height) + n = wp->w_height; + return n; +} + +/* + * Compute wp->w_botline for the current wp->w_topline. Can be called after + * wp->w_topline changed. + */ + static void +comp_botline(win_T *wp) +{ + int n; + linenr_T lnum; + int done; +#ifdef FEAT_FOLDING + linenr_T last; + int folded; +#endif + + /* + * If w_cline_row is valid, start there. + * Otherwise have to start at w_topline. + */ + check_cursor_moved(wp); + if (wp->w_valid & VALID_CROW) + { + lnum = wp->w_cursor.lnum; + done = wp->w_cline_row; + } + else + { + lnum = wp->w_topline; + done = 0; + } + + for ( ; lnum <= wp->w_buffer->b_ml.ml_line_count; ++lnum) + { +#ifdef FEAT_FOLDING + last = lnum; + folded = FALSE; + if (hasFoldingWin(wp, lnum, NULL, &last, TRUE, NULL)) + { + n = 1; + folded = TRUE; + } + else +#endif + { + n = plines_correct_topline(wp, lnum); + } + if ( +#ifdef FEAT_FOLDING + lnum <= wp->w_cursor.lnum && last >= wp->w_cursor.lnum +#else + lnum == wp->w_cursor.lnum +#endif + ) + { + wp->w_cline_row = done; + wp->w_cline_height = n; +#ifdef FEAT_FOLDING + wp->w_cline_folded = folded; +#endif + redraw_for_cursorline(wp); + wp->w_valid |= (VALID_CROW|VALID_CHEIGHT); + } + if (done + n > wp->w_height) + break; + done += n; +#ifdef FEAT_FOLDING + lnum = last; +#endif + } + + // wp->w_botline is the line that is just below the window + wp->w_botline = lnum; + wp->w_valid |= VALID_BOTLINE|VALID_BOTLINE_AP; + + set_empty_rows(wp, done); +} + +/* + * Redraw when w_cline_row changes and 'relativenumber' or 'cursorline' is + * set. + */ + void +redraw_for_cursorline(win_T *wp) +{ + if ((wp->w_p_rnu +#ifdef FEAT_SYN_HL + || wp->w_p_cul +#endif + ) + && (wp->w_valid & VALID_CROW) == 0 + && !pum_visible()) + { + // win_line() will redraw the number column and cursorline only. + redraw_win_later(wp, UPD_VALID); + } +} + +#ifdef FEAT_SYN_HL +/* + * Redraw when w_virtcol changes and 'cursorcolumn' is set or 'cursorlineopt' + * contains "screenline". + */ + static void +redraw_for_cursorcolumn(win_T *wp) +{ + if ((wp->w_valid & VALID_VIRTCOL) == 0 && !pum_visible()) + { + // When 'cursorcolumn' is set need to redraw with UPD_SOME_VALID. + if (wp->w_p_cuc) + redraw_win_later(wp, UPD_SOME_VALID); + // When 'cursorlineopt' contains "screenline" need to redraw with + // UPD_VALID. + else if (wp->w_p_cul && (wp->w_p_culopt_flags & CULOPT_SCRLINE)) + redraw_win_later(wp, UPD_VALID); + } +} +#endif + +/* + * Calculates how much the 'listchars' "precedes" or 'smoothscroll' "<<<" + * marker overlaps with buffer text for window "wp". + * Parameter "extra2" should be the padding on the 2nd line, not the first + * line. + * Returns the number of columns of overlap with buffer text, excluding the + * extra padding on the ledge. + */ + int +sms_marker_overlap(win_T *wp, int extra2) +{ +#if defined(FEAT_LINEBREAK) + // There is no marker overlap when in showbreak mode, thus no need to + // account for it. See wlv_screen_line(). + if (*get_showbreak_value(wp) != NUL) + return 0; +#endif + // Overlap when 'list' and 'listchars' "precedes" are set is 1. + if (wp->w_p_list && wp->w_lcs_chars.prec) + return 1; + + return extra2 > 3 ? 0 : 3 - extra2; +} + +/* + * Calculates the skipcol offset for window "wp" given how many + * physical lines we want to scroll down. + */ + static int +skipcol_from_plines(win_T *wp, int plines_off) +{ + int width1 = wp->w_width - win_col_off(wp); + + int skipcol = 0; + if (plines_off > 0) + skipcol += width1; + if (plines_off > 1) + skipcol += (width1 + win_col_off2(wp)) * (plines_off - 1); + return skipcol; +} + +/* + * Set curwin->w_skipcol to zero and redraw later if needed. + */ + static void +reset_skipcol(void) +{ + if (curwin->w_skipcol == 0) + return; + + curwin->w_skipcol = 0; + + // Should use the least expensive way that displays all that changed. + // UPD_NOT_VALID is too expensive, UPD_REDRAW_TOP does not redraw + // enough when the top line gets another screen line. + redraw_later(UPD_SOME_VALID); +} + +/* + * Update curwin->w_topline and redraw if necessary. + * Used to update the screen before printing a message. + */ + void +update_topline_redraw(void) +{ + update_topline(); + if (must_redraw) + update_screen(0); +} + +/* + * Update curwin->w_topline to move the cursor onto the screen. + */ + void +update_topline(void) +{ + long line_count; + int halfheight; + int n; +#ifdef FEAT_FOLDING + linenr_T lnum; +#endif + int check_topline = FALSE; + int check_botline = FALSE; + long *so_ptr = curwin->w_p_so >= 0 ? &curwin->w_p_so : &p_so; + int save_so = *so_ptr; + + // Cursor is updated instead when this is TRUE for 'splitkeep'. + if (skip_update_topline) + return; + + // If there is no valid screen and when the window height is zero just use + // the cursor line. + if (!screen_valid(TRUE) || curwin->w_height == 0) + { + check_cursor_lnum(); + curwin->w_topline = curwin->w_cursor.lnum; + curwin->w_botline = curwin->w_topline; + curwin->w_scbind_pos = 1; + return; + } + + check_cursor_moved(curwin); + if (curwin->w_valid & VALID_TOPLINE) + return; + + // When dragging with the mouse, don't scroll that quickly + if (mouse_dragging > 0) + *so_ptr = mouse_dragging - 1; + + linenr_T old_topline = curwin->w_topline; +#ifdef FEAT_DIFF + int old_topfill = curwin->w_topfill; +#endif + + /* + * If the buffer is empty, always set topline to 1. + */ + if (BUFEMPTY()) // special case - file is empty + { + if (curwin->w_topline != 1) + redraw_later(UPD_NOT_VALID); + curwin->w_topline = 1; + curwin->w_botline = 2; + curwin->w_valid |= VALID_BOTLINE|VALID_BOTLINE_AP; + curwin->w_scbind_pos = 1; + } + + /* + * If the cursor is above or near the top of the window, scroll the window + * to show the line the cursor is in, with 'scrolloff' context. + */ + else + { + if (curwin->w_topline > 1 || curwin->w_skipcol > 0) + { + // If the cursor is above topline, scrolling is always needed. + // If the cursor is far below topline and there is no folding, + // scrolling down is never needed. + if (curwin->w_cursor.lnum < curwin->w_topline) + check_topline = TRUE; + else if (check_top_offset()) + check_topline = TRUE; + else if (curwin->w_skipcol > 0 + && curwin->w_cursor.lnum == curwin->w_topline) + { + colnr_T vcol; + + // Check that the cursor position is visible. Add columns for + // the marker displayed in the top-left if needed. + getvvcol(curwin, &curwin->w_cursor, &vcol, NULL, NULL); + int overlap = sms_marker_overlap(curwin, curwin_col_off() + - curwin_col_off2()); + if (curwin->w_skipcol + overlap > vcol) + check_topline = TRUE; + } + } +#ifdef FEAT_DIFF + // Check if there are more filler lines than allowed. + if (!check_topline && curwin->w_topfill > diff_check_fill(curwin, + curwin->w_topline)) + check_topline = TRUE; +#endif + + if (check_topline) + { + halfheight = curwin->w_height / 2 - 1; + if (halfheight < 2) + halfheight = 2; + +#ifdef FEAT_FOLDING + if (hasAnyFolding(curwin)) + { + // Count the number of logical lines between the cursor and + // topline + scrolloff (approximation of how much will be + // scrolled). + n = 0; + for (lnum = curwin->w_cursor.lnum; + lnum < curwin->w_topline + *so_ptr; ++lnum) + { + ++n; + // stop at end of file or when we know we are far off + if (lnum >= curbuf->b_ml.ml_line_count || n >= halfheight) + break; + (void)hasFolding(lnum, NULL, &lnum); + } + } + else +#endif + n = curwin->w_topline + *so_ptr - curwin->w_cursor.lnum; + + // If we weren't very close to begin with, we scroll to put the + // cursor in the middle of the window. Otherwise put the cursor + // near the top of the window. + if (n >= halfheight) + scroll_cursor_halfway(FALSE, FALSE); + else + { + scroll_cursor_top(scrolljump_value(), FALSE); + check_botline = TRUE; + } + } + + else + { +#ifdef FEAT_FOLDING + // Make sure topline is the first line of a fold. + (void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL); +#endif + check_botline = TRUE; + } + } + + /* + * If the cursor is below the bottom of the window, scroll the window + * to put the cursor on the window. + * When w_botline is invalid, recompute it first, to avoid a redraw later. + * If w_botline was approximated, we might need a redraw later in a few + * cases, but we don't want to spend (a lot of) time recomputing w_botline + * for every small change. + */ + if (check_botline) + { + if (!(curwin->w_valid & VALID_BOTLINE_AP)) + validate_botline(); + + if (curwin->w_botline <= curbuf->b_ml.ml_line_count) + { + if (curwin->w_cursor.lnum < curwin->w_botline) + { + if (((long)curwin->w_cursor.lnum + >= (long)curwin->w_botline - *so_ptr +#ifdef FEAT_FOLDING + || hasAnyFolding(curwin) +#endif + )) + { + lineoff_T loff; + + // Cursor is (a few lines) above botline, check if there are + // 'scrolloff' window lines below the cursor. If not, need to + // scroll. + n = curwin->w_empty_rows; + loff.lnum = curwin->w_cursor.lnum; +#ifdef FEAT_FOLDING + // In a fold go to its last line. + (void)hasFolding(loff.lnum, NULL, &loff.lnum); +#endif +#ifdef FEAT_DIFF + loff.fill = 0; + n += curwin->w_filler_rows; +#endif + loff.height = 0; + while (loff.lnum < curwin->w_botline +#ifdef FEAT_DIFF + && (loff.lnum + 1 < curwin->w_botline || loff.fill == 0) +#endif + ) + { + n += loff.height; + if (n >= *so_ptr) + break; + botline_forw(&loff); + } + if (n >= *so_ptr) + // sufficient context, no need to scroll + check_botline = FALSE; + } + else + // sufficient context, no need to scroll + check_botline = FALSE; + } + if (check_botline) + { +#ifdef FEAT_FOLDING + if (hasAnyFolding(curwin)) + { + // Count the number of logical lines between the cursor and + // botline - scrolloff (approximation of how much will be + // scrolled). + line_count = 0; + for (lnum = curwin->w_cursor.lnum; + lnum >= curwin->w_botline - *so_ptr; --lnum) + { + ++line_count; + // stop at end of file or when we know we are far off + if (lnum <= 0 || line_count > curwin->w_height + 1) + break; + (void)hasFolding(lnum, &lnum, NULL); + } + } + else +#endif + line_count = curwin->w_cursor.lnum - curwin->w_botline + + 1 + *so_ptr; + if (line_count <= curwin->w_height + 1) + scroll_cursor_bot(scrolljump_value(), FALSE); + else + scroll_cursor_halfway(FALSE, FALSE); + } + } + } + curwin->w_valid |= VALID_TOPLINE; + + /* + * Need to redraw when topline changed. + */ + if (curwin->w_topline != old_topline +#ifdef FEAT_DIFF + || curwin->w_topfill != old_topfill +#endif + ) + { + dollar_vcol = -1; + redraw_later(UPD_VALID); + + // When 'smoothscroll' is not set, should reset w_skipcol. + if (!curwin->w_p_sms) + reset_skipcol(); + else if (curwin->w_skipcol != 0) + redraw_later(UPD_SOME_VALID); + + // May need to set w_skipcol when cursor in w_topline. + if (curwin->w_cursor.lnum == curwin->w_topline) + validate_cursor(); + } + + *so_ptr = save_so; +} + +/* + * Return the scrolljump value to use for the current window. + * When 'scrolljump' is positive use it as-is. + * When 'scrolljump' is negative use it as a percentage of the window height. + */ + static int +scrolljump_value(void) +{ + if (p_sj >= 0) + return (int)p_sj; + return (curwin->w_height * -p_sj) / 100; +} + +/* + * Return TRUE when there are not 'scrolloff' lines above the cursor for the + * current window. + */ + static int +check_top_offset(void) +{ + lineoff_T loff; + int n; + long so = get_scrolloff_value(); + + if (curwin->w_cursor.lnum < curwin->w_topline + so +#ifdef FEAT_FOLDING + || hasAnyFolding(curwin) +#endif + ) + { + loff.lnum = curwin->w_cursor.lnum; +#ifdef FEAT_DIFF + loff.fill = 0; + n = curwin->w_topfill; // always have this context +#else + n = 0; +#endif + // Count the visible screen lines above the cursor line. + while (n < so) + { + topline_back(&loff); + // Stop when included a line above the window. + if (loff.lnum < curwin->w_topline +#ifdef FEAT_DIFF + || (loff.lnum == curwin->w_topline && loff.fill > 0) +#endif + ) + break; + n += loff.height; + } + if (n < so) + return TRUE; + } + return FALSE; +} + +/* + * Update w_curswant. + */ + void +update_curswant_force(void) +{ + validate_virtcol(); + curwin->w_curswant = curwin->w_virtcol +#ifdef FEAT_PROP_POPUP + - curwin->w_virtcol_first_char +#endif + ; + curwin->w_set_curswant = FALSE; +} + +/* + * Update w_curswant if w_set_curswant is set. + */ + void +update_curswant(void) +{ + if (curwin->w_set_curswant) + update_curswant_force(); +} + +/* + * Check if the cursor has moved. Set the w_valid flag accordingly. + */ + void +check_cursor_moved(win_T *wp) +{ + if (wp->w_cursor.lnum != wp->w_valid_cursor.lnum) + { + wp->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL + |VALID_CHEIGHT|VALID_CROW|VALID_TOPLINE + |VALID_BOTLINE|VALID_BOTLINE_AP); + wp->w_valid_cursor = wp->w_cursor; + wp->w_valid_leftcol = wp->w_leftcol; + wp->w_valid_skipcol = wp->w_skipcol; + } + else if (wp->w_skipcol != wp->w_valid_skipcol) + { + wp->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL + |VALID_CHEIGHT|VALID_CROW + |VALID_BOTLINE|VALID_BOTLINE_AP); + wp->w_valid_cursor = wp->w_cursor; + wp->w_valid_leftcol = wp->w_leftcol; + wp->w_valid_skipcol = wp->w_skipcol; + } + else if (wp->w_cursor.col != wp->w_valid_cursor.col + || wp->w_leftcol != wp->w_valid_leftcol + || wp->w_cursor.coladd != wp->w_valid_cursor.coladd) + { + wp->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL); + wp->w_valid_cursor.col = wp->w_cursor.col; + wp->w_valid_leftcol = wp->w_leftcol; + wp->w_valid_cursor.coladd = wp->w_cursor.coladd; + } +} + +/* + * Call this function when some window settings have changed, which require + * the cursor position, botline and topline to be recomputed and the window to + * be redrawn. E.g, when changing the 'wrap' option or folding. + */ + void +changed_window_setting(void) +{ + changed_window_setting_win(curwin); +} + + void +changed_window_setting_win(win_T *wp) +{ + wp->w_lines_valid = 0; + changed_line_abv_curs_win(wp); + wp->w_valid &= ~(VALID_BOTLINE|VALID_BOTLINE_AP|VALID_TOPLINE); + redraw_win_later(wp, UPD_NOT_VALID); +} + +#if defined(FEAT_PROP_POPUP) || defined(PROTO) +/* + * Call changed_window_setting_win() for every window containing "buf". + */ + void +changed_window_setting_buf(buf_T *buf) +{ + tabpage_T *tp; + win_T *wp; + + FOR_ALL_TAB_WINDOWS(tp, wp) + if (wp->w_buffer == buf) + changed_window_setting_win(wp); +} +#endif + +/* + * Set wp->w_topline to a certain number. + */ + void +set_topline(win_T *wp, linenr_T lnum) +{ +#ifdef FEAT_DIFF + linenr_T prev_topline = wp->w_topline; +#endif + +#ifdef FEAT_FOLDING + // go to first of folded lines + (void)hasFoldingWin(wp, lnum, &lnum, NULL, TRUE, NULL); +#endif + // Approximate the value of w_botline + wp->w_botline += lnum - wp->w_topline; + if (wp->w_botline > wp->w_buffer->b_ml.ml_line_count + 1) + wp->w_botline = wp->w_buffer->b_ml.ml_line_count + 1; + wp->w_topline = lnum; + wp->w_topline_was_set = TRUE; +#ifdef FEAT_DIFF + if (lnum != prev_topline) + // Keep the filler lines when the topline didn't change. + wp->w_topfill = 0; +#endif + wp->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE|VALID_TOPLINE); + // Don't set VALID_TOPLINE here, 'scrolloff' needs to be checked. + redraw_later(UPD_VALID); +} + +/* + * Call this function when the length of the cursor line (in screen + * characters) has changed, and the change is before the cursor. + * If the line length changed the number of screen lines might change, + * requiring updating w_topline. That may also invalidate w_crow. + * Need to take care of w_botline separately! + */ + void +changed_cline_bef_curs(void) +{ + curwin->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL|VALID_CROW + |VALID_CHEIGHT|VALID_TOPLINE); +} + + void +changed_cline_bef_curs_win(win_T *wp) +{ + wp->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL|VALID_CROW + |VALID_CHEIGHT|VALID_TOPLINE); +} + +/* + * Call this function when the length of a line (in screen characters) above + * the cursor have changed. + * Need to take care of w_botline separately! + */ + void +changed_line_abv_curs(void) +{ + curwin->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL|VALID_CROW + |VALID_CHEIGHT|VALID_TOPLINE); +} + + void +changed_line_abv_curs_win(win_T *wp) +{ + wp->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL|VALID_CROW + |VALID_CHEIGHT|VALID_TOPLINE); +} + +#if defined(FEAT_PROP_POPUP) || defined(PROTO) +/* + * Display of line has changed for "buf", invalidate cursor position and + * w_botline. + */ + void +changed_line_display_buf(buf_T *buf) +{ + win_T *wp; + + FOR_ALL_WINDOWS(wp) + if (wp->w_buffer == buf) + wp->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL + |VALID_CROW|VALID_CHEIGHT + |VALID_TOPLINE|VALID_BOTLINE|VALID_BOTLINE_AP); +} +#endif + +/* + * Make sure the value of curwin->w_botline is valid. + */ + void +validate_botline(void) +{ + validate_botline_win(curwin); +} + +/* + * Make sure the value of wp->w_botline is valid. + */ + void +validate_botline_win(win_T *wp) +{ + if (!(wp->w_valid & VALID_BOTLINE)) + comp_botline(wp); +} + +/* + * Mark curwin->w_botline as invalid (because of some change in the buffer). + */ + void +invalidate_botline(void) +{ + curwin->w_valid &= ~(VALID_BOTLINE|VALID_BOTLINE_AP); +} + + void +invalidate_botline_win(win_T *wp) +{ + wp->w_valid &= ~(VALID_BOTLINE|VALID_BOTLINE_AP); +} + + void +approximate_botline_win( + win_T *wp) +{ + wp->w_valid &= ~VALID_BOTLINE; +} + +/* + * Return TRUE if curwin->w_wrow and curwin->w_wcol are valid. + */ + int +cursor_valid(void) +{ + check_cursor_moved(curwin); + return ((curwin->w_valid & (VALID_WROW|VALID_WCOL)) == + (VALID_WROW|VALID_WCOL)); +} + +/* + * Validate cursor position. Makes sure w_wrow and w_wcol are valid. + * w_topline must be valid, you may need to call update_topline() first! + */ + void +validate_cursor(void) +{ + check_cursor_lnum(); + check_cursor_moved(curwin); + if ((curwin->w_valid & (VALID_WCOL|VALID_WROW)) != (VALID_WCOL|VALID_WROW)) + curs_columns(TRUE); +} + +#if defined(FEAT_GUI) || defined(PROTO) +/* + * validate w_cline_row. + */ + void +validate_cline_row(void) +{ + /* + * First make sure that w_topline is valid (after moving the cursor). + */ + update_topline(); + check_cursor_moved(curwin); + if (!(curwin->w_valid & VALID_CROW)) + curs_rows(curwin); +} +#endif + +/* + * Compute wp->w_cline_row and wp->w_cline_height, based on the current value + * of wp->w_topline. + */ + static void +curs_rows(win_T *wp) +{ + linenr_T lnum; + int i; + int all_invalid; + int valid; +#ifdef FEAT_FOLDING + long fold_count; +#endif + + // Check if wp->w_lines[].wl_size is invalid + all_invalid = (!redrawing() + || wp->w_lines_valid == 0 + || wp->w_lines[0].wl_lnum > wp->w_topline); + i = 0; + wp->w_cline_row = 0; + for (lnum = wp->w_topline; lnum < wp->w_cursor.lnum; ++i) + { + valid = FALSE; + if (!all_invalid && i < wp->w_lines_valid) + { + if (wp->w_lines[i].wl_lnum < lnum || !wp->w_lines[i].wl_valid) + continue; // skip changed or deleted lines + if (wp->w_lines[i].wl_lnum == lnum) + { +#ifdef FEAT_FOLDING + // Check for newly inserted lines below this row, in which + // case we need to check for folded lines. + if (!wp->w_buffer->b_mod_set + || wp->w_lines[i].wl_lastlnum < wp->w_cursor.lnum + || wp->w_buffer->b_mod_top + > wp->w_lines[i].wl_lastlnum + 1) +#endif + valid = TRUE; + } + else if (wp->w_lines[i].wl_lnum > lnum) + --i; // hold at inserted lines + } + if (valid + && (lnum != wp->w_topline || (wp->w_skipcol == 0 +#ifdef FEAT_DIFF + && !wp->w_p_diff +#endif + ))) + { +#ifdef FEAT_FOLDING + lnum = wp->w_lines[i].wl_lastlnum + 1; + // Cursor inside folded lines, don't count this row + if (lnum > wp->w_cursor.lnum) + break; +#else + ++lnum; +#endif + wp->w_cline_row += wp->w_lines[i].wl_size; + } + else + { +#ifdef FEAT_FOLDING + fold_count = foldedCount(wp, lnum, NULL); + if (fold_count) + { + lnum += fold_count; + if (lnum > wp->w_cursor.lnum) + break; + ++wp->w_cline_row; + } + else +#endif + { + wp->w_cline_row += plines_correct_topline(wp, lnum); + ++lnum; + } + } + } + + check_cursor_moved(wp); + if (!(wp->w_valid & VALID_CHEIGHT)) + { + if (all_invalid + || i == wp->w_lines_valid + || (i < wp->w_lines_valid + && (!wp->w_lines[i].wl_valid + || wp->w_lines[i].wl_lnum != wp->w_cursor.lnum))) + { +#ifdef FEAT_DIFF + if (wp->w_cursor.lnum == wp->w_topline) + wp->w_cline_height = plines_win_nofill(wp, wp->w_cursor.lnum, + TRUE) + wp->w_topfill; + else +#endif + wp->w_cline_height = plines_win(wp, wp->w_cursor.lnum, TRUE); +#ifdef FEAT_FOLDING + wp->w_cline_folded = hasFoldingWin(wp, wp->w_cursor.lnum, + NULL, NULL, TRUE, NULL); +#endif + } + else if (i > wp->w_lines_valid) + { + // a line that is too long to fit on the last screen line + wp->w_cline_height = 0; +#ifdef FEAT_FOLDING + wp->w_cline_folded = hasFoldingWin(wp, wp->w_cursor.lnum, + NULL, NULL, TRUE, NULL); +#endif + } + else + { + wp->w_cline_height = wp->w_lines[i].wl_size; +#ifdef FEAT_FOLDING + wp->w_cline_folded = wp->w_lines[i].wl_folded; +#endif + } + } + + redraw_for_cursorline(curwin); + wp->w_valid |= VALID_CROW|VALID_CHEIGHT; +} + +/* + * Validate curwin->w_virtcol only. + */ + void +validate_virtcol(void) +{ + validate_virtcol_win(curwin); +} + +/* + * Validate wp->w_virtcol only. + */ + void +validate_virtcol_win(win_T *wp) +{ + check_cursor_moved(wp); + + if (wp->w_valid & VALID_VIRTCOL) + return; + +#ifdef FEAT_PROP_POPUP + wp->w_virtcol_first_char = 0; +#endif + getvvcol(wp, &wp->w_cursor, NULL, &(wp->w_virtcol), NULL); +#ifdef FEAT_SYN_HL + redraw_for_cursorcolumn(wp); +#endif + wp->w_valid |= VALID_VIRTCOL; +} + +/* + * Validate curwin->w_cline_height only. + */ + void +validate_cheight(void) +{ + check_cursor_moved(curwin); + + if (curwin->w_valid & VALID_CHEIGHT) + return; + +#ifdef FEAT_DIFF + if (curwin->w_cursor.lnum == curwin->w_topline) + curwin->w_cline_height = plines_nofill(curwin->w_cursor.lnum) + + curwin->w_topfill; + else +#endif + curwin->w_cline_height = plines(curwin->w_cursor.lnum); +#ifdef FEAT_FOLDING + curwin->w_cline_folded = hasFolding(curwin->w_cursor.lnum, NULL, NULL); +#endif + curwin->w_valid |= VALID_CHEIGHT; +} + +/* + * Validate w_wcol and w_virtcol only. + */ + void +validate_cursor_col(void) +{ + colnr_T off; + colnr_T col; + int width; + + validate_virtcol(); + + if (curwin->w_valid & VALID_WCOL) + return; + + col = curwin->w_virtcol; + off = curwin_col_off(); + col += off; + width = curwin->w_width - off + curwin_col_off2(); + + // long line wrapping, adjust curwin->w_wrow + if (curwin->w_p_wrap + && col >= (colnr_T)curwin->w_width + && width > 0) + // use same formula as what is used in curs_columns() + col -= ((col - curwin->w_width) / width + 1) * width; + if (col > (int)curwin->w_leftcol) + col -= curwin->w_leftcol; + else + col = 0; + curwin->w_wcol = col; + + curwin->w_valid |= VALID_WCOL; +#ifdef FEAT_PROP_POPUP + curwin->w_flags &= ~WFLAG_WCOL_OFF_ADDED; +#endif +} + +/* + * Compute offset of a window, occupied by absolute or relative line number, + * fold column and sign column (these don't move when scrolling horizontally). + */ + int +win_col_off(win_T *wp) +{ + return (((wp->w_p_nu || wp->w_p_rnu) ? number_width(wp) + 1 : 0) + + (cmdwin_type == 0 || wp != curwin ? 0 : 1) +#ifdef FEAT_FOLDING + + wp->w_p_fdc +#endif +#ifdef FEAT_SIGNS + + (signcolumn_on(wp) ? 2 : 0) +#endif + ); +} + + int +curwin_col_off(void) +{ + return win_col_off(curwin); +} + +/* + * Return the difference in column offset for the second screen line of a + * wrapped line. It's positive if 'number' or 'relativenumber' is on and 'n' + * is in 'cpoptions'. + */ + int +win_col_off2(win_T *wp) +{ + if ((wp->w_p_nu || wp->w_p_rnu) && vim_strchr(p_cpo, CPO_NUMCOL) != NULL) + return number_width(wp) + 1; + return 0; +} + + int +curwin_col_off2(void) +{ + return win_col_off2(curwin); +} + +/* + * Compute curwin->w_wcol and curwin->w_virtcol. + * Also updates curwin->w_wrow and curwin->w_cline_row. + * Also updates curwin->w_leftcol. + */ + void +curs_columns( + int may_scroll) // when TRUE, may scroll horizontally +{ + int diff; + int extra; // offset for first screen line + int off_left, off_right; + int n; + int p_lines; + int width1; // text width for first screen line + int width2 = 0; // text width for second and later screen line + int new_leftcol; + colnr_T startcol; + colnr_T endcol; + colnr_T prev_skipcol; + long so = get_scrolloff_value(); + long siso = get_sidescrolloff_value(); + int did_sub_skipcol = FALSE; + + /* + * First make sure that w_topline is valid (after moving the cursor). + */ + update_topline(); + + /* + * Next make sure that w_cline_row is valid. + */ + if (!(curwin->w_valid & VALID_CROW)) + curs_rows(curwin); + +#ifdef FEAT_PROP_POPUP + // will be set by getvvcol() but not reset + curwin->w_virtcol_first_char = 0; +#endif + + /* + * Compute the number of virtual columns. + */ +#ifdef FEAT_FOLDING + if (curwin->w_cline_folded) + // In a folded line the cursor is always in the first column + startcol = curwin->w_virtcol = endcol = curwin->w_leftcol; + else +#endif + getvvcol(curwin, &curwin->w_cursor, + &startcol, &(curwin->w_virtcol), &endcol); + + // remove '$' from change command when cursor moves onto it + if (startcol > dollar_vcol) + dollar_vcol = -1; + + extra = curwin_col_off(); + curwin->w_wcol = curwin->w_virtcol + extra; + endcol += extra; + + /* + * Now compute w_wrow, counting screen lines from w_cline_row. + */ + curwin->w_wrow = curwin->w_cline_row; + + width1 = curwin->w_width - extra; + if (width1 <= 0) + { + // No room for text, put cursor in last char of window. + // If not wrapping, the last non-empty line. + curwin->w_wcol = curwin->w_width - 1; + if (curwin->w_p_wrap) + curwin->w_wrow = curwin->w_height - 1; + else + curwin->w_wrow = curwin->w_height - 1 - curwin->w_empty_rows; + } + else if (curwin->w_p_wrap && curwin->w_width != 0) + { + width2 = width1 + curwin_col_off2(); + + // skip columns that are not visible + if (curwin->w_cursor.lnum == curwin->w_topline + && curwin->w_skipcol > 0 + && curwin->w_wcol >= curwin->w_skipcol) + { + // Deduct by multiples of width2. This allows the long line + // wrapping formula below to correctly calculate the w_wcol value + // when wrapping. + if (curwin->w_skipcol <= width1) + curwin->w_wcol -= width2; + else + curwin->w_wcol -= width2 + * (((curwin->w_skipcol - width1) / width2) + 1); + + did_sub_skipcol = TRUE; + } + + // long line wrapping, adjust curwin->w_wrow + if (curwin->w_wcol >= curwin->w_width) + { + // this same formula is used in validate_cursor_col() + n = (curwin->w_wcol - curwin->w_width) / width2 + 1; + curwin->w_wcol -= n * width2; + curwin->w_wrow += n; + } + } + + // No line wrapping: compute curwin->w_leftcol if scrolling is on and line + // is not folded. + // If scrolling is off, curwin->w_leftcol is assumed to be 0 + else if (may_scroll +#ifdef FEAT_FOLDING + && !curwin->w_cline_folded +#endif + ) + { +#ifdef FEAT_PROP_POPUP + if (curwin->w_virtcol_first_char > 0) + { + int cols = (curwin->w_width - extra); + int rows = cols > 0 ? curwin->w_virtcol_first_char / cols : 1; + + // each "above" text prop shifts the text one row down + curwin->w_wrow += rows; + curwin->w_wcol -= rows * cols; + endcol -= rows * cols; + curwin->w_cline_height = rows + 1; + } +#endif + /* + * If Cursor is left of the screen, scroll rightwards. + * If Cursor is right of the screen, scroll leftwards + * If we get closer to the edge than 'sidescrolloff', scroll a little + * extra + */ + off_left = (int)startcol - (int)curwin->w_leftcol - siso; + off_right = (int)endcol - (int)(curwin->w_leftcol + curwin->w_width + - siso) + 1; + if (off_left < 0 || off_right > 0) + { + if (off_left < 0) + diff = -off_left; + else + diff = off_right; + + // When far off or not enough room on either side, put cursor in + // middle of window. + if (p_ss == 0 || diff >= width1 / 2 || off_right >= off_left) + new_leftcol = curwin->w_wcol - extra - width1 / 2; + else + { + if (diff < p_ss) + diff = p_ss; + if (off_left < 0) + new_leftcol = curwin->w_leftcol - diff; + else + new_leftcol = curwin->w_leftcol + diff; + } + if (new_leftcol < 0) + new_leftcol = 0; + if (new_leftcol != (int)curwin->w_leftcol) + { + curwin->w_leftcol = new_leftcol; + // screen has to be redrawn with new curwin->w_leftcol + redraw_later(UPD_NOT_VALID); + } + } + curwin->w_wcol -= curwin->w_leftcol; + } + else if (curwin->w_wcol > (int)curwin->w_leftcol) + curwin->w_wcol -= curwin->w_leftcol; + else + curwin->w_wcol = 0; + +#ifdef FEAT_DIFF + // Skip over filler lines. At the top use w_topfill, there + // may be some filler lines above the window. + if (curwin->w_cursor.lnum == curwin->w_topline) + curwin->w_wrow += curwin->w_topfill; + else + curwin->w_wrow += diff_check_fill(curwin, curwin->w_cursor.lnum); +#endif + + prev_skipcol = curwin->w_skipcol; + + p_lines = 0; + + if ((curwin->w_wrow >= curwin->w_height + || ((prev_skipcol > 0 + || curwin->w_wrow + so >= curwin->w_height) + && (p_lines = +#ifdef FEAT_DIFF + plines_win_nofill +#else + plines_win +#endif + (curwin, curwin->w_cursor.lnum, FALSE)) + - 1 >= curwin->w_height)) + && curwin->w_height != 0 + && curwin->w_cursor.lnum == curwin->w_topline + && width2 > 0 + && curwin->w_width != 0) + { + // Cursor past end of screen. Happens with a single line that does + // not fit on screen. Find a skipcol to show the text around the + // cursor. Avoid scrolling all the time. compute value of "extra": + // 1: Less than 'scrolloff' lines above + // 2: Less than 'scrolloff' lines below + // 3: both of them + extra = 0; + if (curwin->w_skipcol + so * width2 > curwin->w_virtcol) + extra = 1; + // Compute last display line of the buffer line that we want at the + // bottom of the window. + if (p_lines == 0) + p_lines = plines_win(curwin, curwin->w_cursor.lnum, FALSE); + --p_lines; + if (p_lines > curwin->w_wrow + so) + n = curwin->w_wrow + so; + else + n = p_lines; + if ((colnr_T)n >= curwin->w_height + curwin->w_skipcol / width2 - so) + extra += 2; + + if (extra == 3 || curwin->w_height <= so * 2) + { + // not enough room for 'scrolloff', put cursor in the middle + n = curwin->w_virtcol / width2; + if (n > curwin->w_height / 2) + n -= curwin->w_height / 2; + else + n = 0; + // don't skip more than necessary + if (n > p_lines - curwin->w_height + 1) + n = p_lines - curwin->w_height + 1; + if (n > 0) + curwin->w_skipcol = width1 + (n - 1) * width2; + else + curwin->w_skipcol = 0; + } + else if (extra == 1) + { + // less than 'scrolloff' lines above, decrease skipcol + extra = (curwin->w_skipcol + so * width2 - curwin->w_virtcol + + width2 - 1) / width2; + if (extra > 0) + { + if ((colnr_T)(extra * width2) > curwin->w_skipcol) + extra = curwin->w_skipcol / width2; + curwin->w_skipcol -= extra * width2; + } + } + else if (extra == 2) + { + // less than 'scrolloff' lines below, increase skipcol + endcol = (n - curwin->w_height + 1) * width2; + while (endcol > curwin->w_virtcol) + endcol -= width2; + if (endcol > curwin->w_skipcol) + curwin->w_skipcol = endcol; + } + + // adjust w_wrow for the changed w_skipcol + if (did_sub_skipcol) + curwin->w_wrow -= (curwin->w_skipcol - prev_skipcol) / width2; + else + curwin->w_wrow -= curwin->w_skipcol / width2; + + if (curwin->w_wrow >= curwin->w_height) + { + // small window, make sure cursor is in it + extra = curwin->w_wrow - curwin->w_height + 1; + curwin->w_skipcol += extra * width2; + curwin->w_wrow -= extra; + } + + extra = ((int)prev_skipcol - (int)curwin->w_skipcol) / width2; + if (extra > 0) + win_ins_lines(curwin, 0, extra, FALSE, FALSE); + else if (extra < 0) + win_del_lines(curwin, 0, -extra, FALSE, FALSE, 0); + } + else if (!curwin->w_p_sms) + curwin->w_skipcol = 0; + if (prev_skipcol != curwin->w_skipcol) + redraw_later(UPD_SOME_VALID); + +#ifdef FEAT_SYN_HL + redraw_for_cursorcolumn(curwin); +#endif +#if defined(FEAT_PROP_POPUP) && defined(FEAT_TERMINAL) + if (popup_is_popup(curwin) && curbuf->b_term != NULL) + { + curwin->w_wrow += popup_top_extra(curwin); + curwin->w_wcol += popup_left_extra(curwin); + curwin->w_flags |= WFLAG_WCOL_OFF_ADDED + WFLAG_WROW_OFF_ADDED; + } + else + curwin->w_flags &= ~(WFLAG_WCOL_OFF_ADDED + WFLAG_WROW_OFF_ADDED); +#endif + + // now w_leftcol and w_skipcol are valid, avoid check_cursor_moved() + // thinking otherwise + curwin->w_valid_leftcol = curwin->w_leftcol; + curwin->w_valid_skipcol = curwin->w_skipcol; + + curwin->w_valid |= VALID_WCOL|VALID_WROW|VALID_VIRTCOL; +} + +#if (defined(FEAT_EVAL) || defined(FEAT_PROP_POPUP)) || defined(PROTO) +/* + * Compute the screen position of text character at "pos" in window "wp" + * The resulting values are one-based, zero when character is not visible. + */ + void +textpos2screenpos( + win_T *wp, + pos_T *pos, + int *rowp, // screen row + int *scolp, // start screen column + int *ccolp, // cursor screen column + int *ecolp) // end screen column +{ + colnr_T scol = 0, ccol = 0, ecol = 0; + int row = 0; + colnr_T coloff = 0; + + if (pos->lnum >= wp->w_topline && pos->lnum <= wp->w_botline) + { + colnr_T col; + int width; + linenr_T lnum = pos->lnum; +#ifdef FEAT_FOLDING + int is_folded; + + is_folded = hasFoldingWin(wp, lnum, &lnum, NULL, TRUE, NULL); +#endif + row = plines_m_win(wp, wp->w_topline, lnum - 1, FALSE); + // "row" should be the screen line where line "lnum" begins, which can + // be negative if "lnum" is "w_topline" and "w_skipcol" is non-zero. + row -= adjust_plines_for_skipcol(wp); + +#ifdef FEAT_DIFF + // Add filler lines above this buffer line. + row += lnum == wp->w_topline ? wp->w_topfill + : diff_check_fill(wp, lnum); +#endif + + colnr_T off = win_col_off(wp); +#ifdef FEAT_FOLDING + if (is_folded) + { + row += W_WINROW(wp) + 1; + coloff = wp->w_wincol + 1 + off; + } + else +#endif + { + getvcol(wp, pos, &scol, &ccol, &ecol); + + // similar to what is done in validate_cursor_col() + col = scol; + col += off; + width = wp->w_width - off + win_col_off2(wp); + + // long line wrapping, adjust row + if (wp->w_p_wrap + && col >= (colnr_T)wp->w_width + && width > 0) + { + // use same formula as what is used in curs_columns() + int rowoff = ((col - wp->w_width) / width + 1); + col -= rowoff * width; + row += rowoff; + } + col -= wp->w_leftcol; + if (col >= wp->w_width) + col = -1; + if (col >= 0 && row >= 0 && row < wp->w_height) + { + coloff = col - scol + wp->w_wincol + 1; + row += W_WINROW(wp) + 1; + } + else + // character is out of the window + row = scol = ccol = ecol = 0; + } + } + *rowp = row; + *scolp = scol + coloff; + *ccolp = ccol + coloff; + *ecolp = ecol + coloff; +} +#endif + +#if defined(FEAT_EVAL) || defined(PROTO) +/* + * "screenpos({winid}, {lnum}, {col})" function + */ + void +f_screenpos(typval_T *argvars UNUSED, typval_T *rettv) +{ + dict_T *dict; + win_T *wp; + pos_T pos; + int row = 0; + int scol = 0, ccol = 0, ecol = 0; + + if (rettv_dict_alloc(rettv) == FAIL) + return; + dict = rettv->vval.v_dict; + + if (in_vim9script() + && (check_for_number_arg(argvars, 0) == FAIL + || check_for_number_arg(argvars, 1) == FAIL + || check_for_number_arg(argvars, 2) == FAIL)) + return; + + wp = find_win_by_nr_or_id(&argvars[0]); + if (wp == NULL) + return; + + pos.lnum = tv_get_number(&argvars[1]); + if (pos.lnum > wp->w_buffer->b_ml.ml_line_count) + { + semsg(_(e_invalid_line_number_nr), pos.lnum); + return; + } + pos.col = tv_get_number(&argvars[2]) - 1; + if (pos.col < 0) + pos.col = 0; + pos.coladd = 0; + textpos2screenpos(wp, &pos, &row, &scol, &ccol, &ecol); + + dict_add_number(dict, "row", row); + dict_add_number(dict, "col", scol); + dict_add_number(dict, "curscol", ccol); + dict_add_number(dict, "endcol", ecol); +} + +/* + * Convert a virtual (screen) column to a character column. The first column + * is one. For a multibyte character, the column number of the first byte is + * returned. + */ + static int +virtcol2col(win_T *wp, linenr_T lnum, int vcol) +{ + int offset = vcol2col(wp, lnum, vcol - 1, NULL); + char_u *line = ml_get_buf(wp->w_buffer, lnum, FALSE); + char_u *p = line + offset; + + if (*p == NUL) + { + if (p == line) // empty line + return 0; + // Move to the first byte of the last char. + MB_PTR_BACK(line, p); + } + return (int)(p - line + 1); +} + +/* + * "virtcol2col({winid}, {lnum}, {col})" function + */ + void +f_virtcol2col(typval_T *argvars UNUSED, typval_T *rettv) +{ + win_T *wp; + linenr_T lnum; + int screencol; + int error = FALSE; + + rettv->vval.v_number = -1; + + if (check_for_number_arg(argvars, 0) == FAIL + || check_for_number_arg(argvars, 1) == FAIL + || check_for_number_arg(argvars, 2) == FAIL) + return; + + wp = find_win_by_nr_or_id(&argvars[0]); + if (wp == NULL) + return; + + lnum = tv_get_number_chk(&argvars[1], &error); + if (error || lnum < 0 || lnum > wp->w_buffer->b_ml.ml_line_count) + return; + + screencol = tv_get_number_chk(&argvars[2], &error); + if (error || screencol < 0) + return; + + rettv->vval.v_number = virtcol2col(wp, lnum, screencol); +} +#endif + +/* + * Scroll the current window down by "line_count" logical lines. "CTRL-Y" + */ + void +scrolldown( + long line_count, + int byfold UNUSED) // TRUE: count a closed fold as one line +{ + long done = 0; // total # of physical lines done + int wrow; + int moved = FALSE; + int do_sms = curwin->w_p_wrap && curwin->w_p_sms; + int width1 = 0; + int width2 = 0; + + if (do_sms) + { + width1 = curwin->w_width - curwin_col_off(); + width2 = width1 + curwin_col_off2(); + } + +#ifdef FEAT_FOLDING + linenr_T first; + + // Make sure w_topline is at the first of a sequence of folded lines. + (void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL); +#endif + validate_cursor(); // w_wrow needs to be valid + for (int todo = line_count; todo > 0; --todo) + { +#ifdef FEAT_DIFF + if (curwin->w_topfill < diff_check(curwin, curwin->w_topline) + && curwin->w_topfill < curwin->w_height - 1) + { + ++curwin->w_topfill; + ++done; + } + else +#endif + { + // break when at the very top + if (curwin->w_topline == 1 + && (!do_sms || curwin->w_skipcol < width1)) + break; + if (do_sms && curwin->w_skipcol >= width1) + { + // scroll a screen line down + if (curwin->w_skipcol >= width1 + width2) + curwin->w_skipcol -= width2; + else + curwin->w_skipcol -= width1; + redraw_later(UPD_NOT_VALID); + ++done; + } + else + { + // scroll a text line down + --curwin->w_topline; + curwin->w_skipcol = 0; +#ifdef FEAT_DIFF + curwin->w_topfill = 0; +#endif +#ifdef FEAT_FOLDING + // A sequence of folded lines only counts for one logical line + if (hasFolding(curwin->w_topline, &first, NULL)) + { + ++done; + if (!byfold) + todo -= curwin->w_topline - first - 1; + curwin->w_botline -= curwin->w_topline - first; + curwin->w_topline = first; + } + else +#endif + if (do_sms) + { + int size = win_linetabsize(curwin, curwin->w_topline, + ml_get(curwin->w_topline), (colnr_T)MAXCOL); + if (size > width1) + { + curwin->w_skipcol = width1; + size -= width1; + redraw_later(UPD_NOT_VALID); + } + while (size > width2) + { + curwin->w_skipcol += width2; + size -= width2; + } + ++done; + } + else + done += PLINES_NOFILL(curwin->w_topline); + } + } + --curwin->w_botline; // approximate w_botline + invalidate_botline(); + } + curwin->w_wrow += done; // keep w_wrow updated + curwin->w_cline_row += done; // keep w_cline_row updated + +#ifdef FEAT_DIFF + if (curwin->w_cursor.lnum == curwin->w_topline) + curwin->w_cline_row = 0; + check_topfill(curwin, TRUE); +#endif + + /* + * Compute the row number of the last row of the cursor line + * and move the cursor onto the displayed part of the window. + */ + wrow = curwin->w_wrow; + if (curwin->w_p_wrap && curwin->w_width != 0) + { + validate_virtcol(); + validate_cheight(); + wrow += curwin->w_cline_height - 1 - + curwin->w_virtcol / curwin->w_width; + } + while (wrow >= curwin->w_height && curwin->w_cursor.lnum > 1) + { +#ifdef FEAT_FOLDING + if (hasFolding(curwin->w_cursor.lnum, &first, NULL)) + { + --wrow; + if (first == 1) + curwin->w_cursor.lnum = 1; + else + curwin->w_cursor.lnum = first - 1; + } + else +#endif + wrow -= plines(curwin->w_cursor.lnum--); + curwin->w_valid &= + ~(VALID_WROW|VALID_WCOL|VALID_CHEIGHT|VALID_CROW|VALID_VIRTCOL); + moved = TRUE; + } + if (moved) + { +#ifdef FEAT_FOLDING + // Move cursor to first line of closed fold. + foldAdjustCursor(); +#endif + coladvance(curwin->w_curswant); + } + + if (curwin->w_cursor.lnum == curwin->w_topline && do_sms) + { + long so = get_scrolloff_value(); + int scrolloff_cols = so == 0 ? 0 : width1 + (so - 1) * width2; + + // make sure the cursor is in the visible text + validate_virtcol(); + int col = curwin->w_virtcol - curwin->w_skipcol + scrolloff_cols; + int row = 0; + if (col >= width1) + { + col -= width1; + ++row; + } + if (col > width2 && width2 > 0) + { + row += col / width2; + // even so col is not used anymore, + // make sure it is correct, just in case + col = col % width2; + } + if (row >= curwin->w_height) + { + curwin->w_curswant = curwin->w_virtcol + - (row - curwin->w_height + 1) * width2; + coladvance(curwin->w_curswant); + } + } +} + +/* + * Scroll the current window up by "line_count" logical lines. "CTRL-E" + */ + void +scrollup( + long line_count, + int byfold UNUSED) // TRUE: count a closed fold as one line +{ + int do_sms = curwin->w_p_wrap && curwin->w_p_sms; + + if (do_sms +# ifdef FEAT_FOLDING + || (byfold && hasAnyFolding(curwin)) +# endif +# ifdef FEAT_DIFF + || (curwin->w_p_diff && !curwin->w_p_wrap) +# endif + ) + { + int width1 = curwin->w_width - curwin_col_off(); + int width2 = width1 + curwin_col_off2(); + int size = 0; + colnr_T prev_skipcol = curwin->w_skipcol; + + if (do_sms) + size = linetabsize(curwin, curwin->w_topline); + + // diff mode: first consume "topfill" + // 'smoothscroll': increase "w_skipcol" until it goes over the end of + // the line, then advance to the next line. + // folding: count each sequence of folded lines as one logical line. + for (int todo = line_count; todo > 0; --todo) + { +# ifdef FEAT_DIFF + if (curwin->w_topfill > 0) + --curwin->w_topfill; + else +# endif + { + linenr_T lnum = curwin->w_topline; + +# ifdef FEAT_FOLDING + if (byfold) + // for a closed fold: go to the last line in the fold + (void)hasFolding(lnum, NULL, &lnum); +# endif + if (lnum == curwin->w_topline && do_sms) + { + // 'smoothscroll': increase "w_skipcol" until it goes over + // the end of the line, then advance to the next line. + int add = curwin->w_skipcol > 0 ? width2 : width1; + curwin->w_skipcol += add; + if (curwin->w_skipcol >= size) + { + if (lnum == curbuf->b_ml.ml_line_count) + { + // at the last screen line, can't scroll further + curwin->w_skipcol -= add; + break; + } + ++lnum; + } + } + else + { + if (lnum >= curbuf->b_ml.ml_line_count) + break; + ++lnum; + } + + if (lnum > curwin->w_topline) + { + // approximate w_botline + curwin->w_botline += lnum - curwin->w_topline; + curwin->w_topline = lnum; +# ifdef FEAT_DIFF + curwin->w_topfill = diff_check_fill(curwin, lnum); +# endif + curwin->w_skipcol = 0; + if (todo > 1 && do_sms) + size = linetabsize(curwin, curwin->w_topline); + } + } + } + + if (prev_skipcol > 0 || curwin->w_skipcol > 0) + // need to redraw more, because wl_size of the (new) topline may + // now be invalid + redraw_later(UPD_NOT_VALID); + } + else + { + curwin->w_topline += line_count; + curwin->w_botline += line_count; // approximate w_botline + } + + if (curwin->w_topline > curbuf->b_ml.ml_line_count) + curwin->w_topline = curbuf->b_ml.ml_line_count; + if (curwin->w_botline > curbuf->b_ml.ml_line_count + 1) + curwin->w_botline = curbuf->b_ml.ml_line_count + 1; + +#ifdef FEAT_DIFF + check_topfill(curwin, FALSE); +#endif + +#ifdef FEAT_FOLDING + if (hasAnyFolding(curwin)) + // Make sure w_topline is at the first of a sequence of folded lines. + (void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL); +#endif + + curwin->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE); + if (curwin->w_cursor.lnum < curwin->w_topline) + { + curwin->w_cursor.lnum = curwin->w_topline; + curwin->w_valid &= + ~(VALID_WROW|VALID_WCOL|VALID_CHEIGHT|VALID_CROW|VALID_VIRTCOL); + coladvance(curwin->w_curswant); + } + if (curwin->w_cursor.lnum == curwin->w_topline + && do_sms && curwin->w_skipcol > 0) + { + int col_off = curwin_col_off(); + int col_off2 = curwin_col_off2(); + + int width1 = curwin->w_width - col_off; + int width2 = width1 + col_off2; + int extra2 = col_off - col_off2; + long so = get_scrolloff_value(); + int scrolloff_cols = so == 0 ? 0 : width1 + (so - 1) * width2; + int space_cols = (curwin->w_height - 1) * width2; + + // If we have non-zero scrolloff, just ignore the marker as we are + // going past it anyway. + int overlap = scrolloff_cols != 0 ? 0 + : sms_marker_overlap(curwin, extra2); + + // Make sure the cursor is in a visible part of the line, taking + // 'scrolloff' into account, but using screen lines. + // If there are not enough screen lines put the cursor in the middle. + if (scrolloff_cols > space_cols / 2) + scrolloff_cols = space_cols / 2; + validate_virtcol(); + if (curwin->w_virtcol < curwin->w_skipcol + overlap + scrolloff_cols) + { + colnr_T col = curwin->w_virtcol; + + if (col < width1) + col += width1; + while (col < curwin->w_skipcol + overlap + scrolloff_cols) + col += width2; + curwin->w_curswant = col; + coladvance(curwin->w_curswant); + + // validate_virtcol() marked various things as valid, but after + // moving the cursor they need to be recomputed + curwin->w_valid &= + ~(VALID_WROW|VALID_WCOL|VALID_CHEIGHT|VALID_CROW|VALID_VIRTCOL); + } + } +} + +/* + * Called after changing the cursor column: make sure that curwin->w_skipcol is + * valid for 'smoothscroll'. + */ + void +adjust_skipcol(void) +{ + if (!curwin->w_p_wrap + || !curwin->w_p_sms + || curwin->w_cursor.lnum != curwin->w_topline) + return; + + int width1 = curwin->w_width - curwin_col_off(); + if (width1 <= 0) + return; // no text will be displayed + + int width2 = width1 + curwin_col_off2(); + long so = get_scrolloff_value(); + int scrolloff_cols = so == 0 ? 0 : width1 + (so - 1) * width2; + int scrolled = FALSE; + + validate_cheight(); + if (curwin->w_cline_height == curwin->w_height + // w_cline_height may be capped at w_height, check there aren't + // actually more lines. + && plines_win(curwin, curwin->w_cursor.lnum, FALSE) + <= curwin->w_height) + { + // the line just fits in the window, don't scroll + reset_skipcol(); + return; + } + + validate_virtcol(); + int overlap = sms_marker_overlap(curwin, + curwin_col_off() - curwin_col_off2()); + while (curwin->w_skipcol > 0 + && curwin->w_virtcol < curwin->w_skipcol + overlap + scrolloff_cols) + { + // scroll a screen line down + if (curwin->w_skipcol >= width1 + width2) + curwin->w_skipcol -= width2; + else + curwin->w_skipcol -= width1; + scrolled = TRUE; + } + if (scrolled) + { + validate_virtcol(); + redraw_later(UPD_NOT_VALID); + return; // don't scroll in the other direction now + } + + int col = curwin->w_virtcol - curwin->w_skipcol + scrolloff_cols; + int row = 0; + if (col >= width1) + { + col -= width1; + ++row; + } + if (col > width2) + { + row += col / width2; + // col may no longer be used, but make + // sure it is correct anyhow, just in case + col = col % width2; + } + if (row >= curwin->w_height) + { + if (curwin->w_skipcol == 0) + { + curwin->w_skipcol += width1; + --row; + } + if (row >= curwin->w_height) + curwin->w_skipcol += (row - curwin->w_height) * width2; + redraw_later(UPD_NOT_VALID); + } +} + +#ifdef FEAT_DIFF +/* + * Don't end up with too many filler lines in the window. + */ + void +check_topfill( + win_T *wp, + int down) // when TRUE scroll down when not enough space +{ + int n; + + if (wp->w_topfill <= 0) + return; + + n = plines_win_nofill(wp, wp->w_topline, TRUE); + if (wp->w_topfill + n > wp->w_height) + { + if (down && wp->w_topline > 1) + { + --wp->w_topline; + wp->w_topfill = 0; + } + else + { + wp->w_topfill = wp->w_height - n; + if (wp->w_topfill < 0) + wp->w_topfill = 0; + } + } +} + +/* + * Use as many filler lines as possible for w_topline. Make sure w_topline + * is still visible. + */ + static void +max_topfill(void) +{ + int n; + + n = plines_nofill(curwin->w_topline); + if (n >= curwin->w_height) + curwin->w_topfill = 0; + else + { + curwin->w_topfill = diff_check_fill(curwin, curwin->w_topline); + if (curwin->w_topfill + n > curwin->w_height) + curwin->w_topfill = curwin->w_height - n; + } +} +#endif + +/* + * Scroll the screen one line down, but don't do it if it would move the + * cursor off the screen. + */ + void +scrolldown_clamp(void) +{ + int end_row; +#ifdef FEAT_DIFF + int can_fill = (curwin->w_topfill + < diff_check_fill(curwin, curwin->w_topline)); +#endif + + if (curwin->w_topline <= 1 +#ifdef FEAT_DIFF + && !can_fill +#endif + ) + return; + + validate_cursor(); // w_wrow needs to be valid + + /* + * Compute the row number of the last row of the cursor line + * and make sure it doesn't go off the screen. Make sure the cursor + * doesn't go past 'scrolloff' lines from the screen end. + */ + end_row = curwin->w_wrow; +#ifdef FEAT_DIFF + if (can_fill) + ++end_row; + else + end_row += plines_nofill(curwin->w_topline - 1); +#else + end_row += plines(curwin->w_topline - 1); +#endif + if (curwin->w_p_wrap && curwin->w_width != 0) + { + validate_cheight(); + validate_virtcol(); + end_row += curwin->w_cline_height - 1 - + curwin->w_virtcol / curwin->w_width; + } + if (end_row < curwin->w_height - get_scrolloff_value()) + { +#ifdef FEAT_DIFF + if (can_fill) + { + ++curwin->w_topfill; + check_topfill(curwin, TRUE); + } + else + { + --curwin->w_topline; + curwin->w_topfill = 0; + } +#else + --curwin->w_topline; +#endif +#ifdef FEAT_FOLDING + (void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL); +#endif + --curwin->w_botline; // approximate w_botline + curwin->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE); + } +} + +/* + * Scroll the screen one line up, but don't do it if it would move the cursor + * off the screen. + */ + void +scrollup_clamp(void) +{ + int start_row; + + if (curwin->w_topline == curbuf->b_ml.ml_line_count +#ifdef FEAT_DIFF + && curwin->w_topfill == 0 +#endif + ) + return; + + validate_cursor(); // w_wrow needs to be valid + + /* + * Compute the row number of the first row of the cursor line + * and make sure it doesn't go off the screen. Make sure the cursor + * doesn't go before 'scrolloff' lines from the screen start. + */ +#ifdef FEAT_DIFF + start_row = curwin->w_wrow - plines_nofill(curwin->w_topline) + - curwin->w_topfill; +#else + start_row = curwin->w_wrow - plines(curwin->w_topline); +#endif + if (curwin->w_p_wrap && curwin->w_width != 0) + { + validate_virtcol(); + start_row -= curwin->w_virtcol / curwin->w_width; + } + if (start_row >= get_scrolloff_value()) + { +#ifdef FEAT_DIFF + if (curwin->w_topfill > 0) + --curwin->w_topfill; + else +#endif + { +#ifdef FEAT_FOLDING + (void)hasFolding(curwin->w_topline, NULL, &curwin->w_topline); +#endif + ++curwin->w_topline; + } + ++curwin->w_botline; // approximate w_botline + curwin->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE); + } +} + +/* + * Add one line above "lp->lnum". This can be a filler line, a closed fold or + * a (wrapped) text line. Uses and sets "lp->fill". + * Returns the height of the added line in "lp->height". + * Lines above the first one are incredibly high: MAXCOL. + */ + static void +topline_back_winheight( + lineoff_T *lp, + int winheight) // when TRUE limit to window height +{ +#ifdef FEAT_DIFF + if (lp->fill < diff_check_fill(curwin, lp->lnum)) + { + // Add a filler line. + ++lp->fill; + lp->height = 1; + } + else +#endif + { + --lp->lnum; +#ifdef FEAT_DIFF + lp->fill = 0; +#endif + if (lp->lnum < 1) + lp->height = MAXCOL; + else +#ifdef FEAT_FOLDING + if (hasFolding(lp->lnum, &lp->lnum, NULL)) + // Add a closed fold + lp->height = 1; + else +#endif + lp->height = PLINES_WIN_NOFILL(curwin, lp->lnum, winheight); + } +} + + static void +topline_back(lineoff_T *lp) +{ + topline_back_winheight(lp, TRUE); +} + + +/* + * Add one line below "lp->lnum". This can be a filler line, a closed fold or + * a (wrapped) text line. Uses and sets "lp->fill". + * Returns the height of the added line in "lp->height". + * Lines below the last one are incredibly high. + */ + static void +botline_forw(lineoff_T *lp) +{ +#ifdef FEAT_DIFF + if (lp->fill < diff_check_fill(curwin, lp->lnum + 1)) + { + // Add a filler line. + ++lp->fill; + lp->height = 1; + } + else +#endif + { + ++lp->lnum; +#ifdef FEAT_DIFF + lp->fill = 0; +#endif + if (lp->lnum > curbuf->b_ml.ml_line_count) + lp->height = MAXCOL; + else +#ifdef FEAT_FOLDING + if (hasFolding(lp->lnum, NULL, &lp->lnum)) + // Add a closed fold + lp->height = 1; + else +#endif + lp->height = PLINES_NOFILL(lp->lnum); + } +} + +#ifdef FEAT_DIFF +/* + * Switch from including filler lines below lp->lnum to including filler + * lines above loff.lnum + 1. This keeps pointing to the same line. + * When there are no filler lines nothing changes. + */ + static void +botline_topline(lineoff_T *lp) +{ + if (lp->fill > 0) + { + ++lp->lnum; + lp->fill = diff_check_fill(curwin, lp->lnum) - lp->fill + 1; + } +} + +/* + * Switch from including filler lines above lp->lnum to including filler + * lines below loff.lnum - 1. This keeps pointing to the same line. + * When there are no filler lines nothing changes. + */ + static void +topline_botline(lineoff_T *lp) +{ + if (lp->fill > 0) + { + lp->fill = diff_check_fill(curwin, lp->lnum) - lp->fill + 1; + --lp->lnum; + } +} +#endif + +/* + * Recompute topline to put the cursor at the top of the window. + * Scroll at least "min_scroll" lines. + * If "always" is TRUE, always set topline (for "zt"). + */ + void +scroll_cursor_top(int min_scroll, int always) +{ + int scrolled = 0; + int extra = 0; + int used; + int i; + linenr_T top; // just above displayed lines + linenr_T bot; // just below displayed lines + linenr_T old_topline = curwin->w_topline; + int old_skipcol = curwin->w_skipcol; +#ifdef FEAT_DIFF + linenr_T old_topfill = curwin->w_topfill; +#endif + linenr_T new_topline; + int off = get_scrolloff_value(); + + if (mouse_dragging > 0) + off = mouse_dragging - 1; + + /* + * Decrease topline until: + * - it has become 1 + * - (part of) the cursor line is moved off the screen or + * - moved at least 'scrolljump' lines and + * - at least 'scrolloff' lines above and below the cursor + */ + validate_cheight(); + used = curwin->w_cline_height; // includes filler lines above + if (curwin->w_cursor.lnum < curwin->w_topline) + scrolled = used; + +#ifdef FEAT_FOLDING + if (hasFolding(curwin->w_cursor.lnum, &top, &bot)) + { + --top; + ++bot; + } + else +#endif + { + top = curwin->w_cursor.lnum - 1; + bot = curwin->w_cursor.lnum + 1; + } + new_topline = top + 1; + +#ifdef FEAT_DIFF + // "used" already contains the number of filler lines above, don't add it + // again. + // Hide filler lines above cursor line by adding them to "extra". + extra += diff_check_fill(curwin, curwin->w_cursor.lnum); +#endif + + /* + * Check if the lines from "top" to "bot" fit in the window. If they do, + * set new_topline and advance "top" and "bot" to include more lines. + */ + while (top > 0) + { +#ifdef FEAT_FOLDING + if (hasFolding(top, &top, NULL)) + // count one logical line for a sequence of folded lines + i = 1; + else +#endif + i = PLINES_NOFILL(top); + if (top < curwin->w_topline) + scrolled += i; + + // If scrolling is needed, scroll at least 'sj' lines. + if ((new_topline >= curwin->w_topline || scrolled > min_scroll) + && extra >= off) + break; + + used += i; + if (extra + i <= off && bot < curbuf->b_ml.ml_line_count) + { +#ifdef FEAT_FOLDING + if (hasFolding(bot, NULL, &bot)) + // count one logical line for a sequence of folded lines + ++used; + else +#endif + used += plines(bot); + } + if (used > curwin->w_height) + break; + + extra += i; + new_topline = top; + --top; + ++bot; + } + + /* + * If we don't have enough space, put cursor in the middle. + * This makes sure we get the same position when using "k" and "j" + * in a small window. + */ + if (used > curwin->w_height) + scroll_cursor_halfway(FALSE, FALSE); + else + { + /* + * If "always" is FALSE, only adjust topline to a lower value, higher + * value may happen with wrapping lines. + */ + if (new_topline < curwin->w_topline || always) + curwin->w_topline = new_topline; + if (curwin->w_topline > curwin->w_cursor.lnum) + curwin->w_topline = curwin->w_cursor.lnum; +#ifdef FEAT_DIFF + curwin->w_topfill = diff_check_fill(curwin, curwin->w_topline); + if (curwin->w_topfill > 0 && extra > off) + { + curwin->w_topfill -= extra - off; + if (curwin->w_topfill < 0) + curwin->w_topfill = 0; + } + check_topfill(curwin, FALSE); +#endif + if (curwin->w_topline != old_topline) + reset_skipcol(); + else if (curwin->w_topline == curwin->w_cursor.lnum) + { + validate_virtcol(); + if (curwin->w_skipcol >= curwin->w_virtcol) + // TODO: if the line doesn't fit may optimize w_skipcol instead + // of making it zero + reset_skipcol(); + } + if (curwin->w_topline != old_topline + || curwin->w_skipcol != old_skipcol +#ifdef FEAT_DIFF + || curwin->w_topfill != old_topfill +#endif + ) + curwin->w_valid &= + ~(VALID_WROW|VALID_CROW|VALID_BOTLINE|VALID_BOTLINE_AP); + curwin->w_valid |= VALID_TOPLINE; + } +} + +/* + * Set w_empty_rows and w_filler_rows for window "wp", having used up "used" + * screen lines for text lines. + */ + void +set_empty_rows(win_T *wp, int used) +{ +#ifdef FEAT_DIFF + wp->w_filler_rows = 0; +#endif + if (used == 0) + wp->w_empty_rows = 0; // single line that doesn't fit + else + { + wp->w_empty_rows = wp->w_height - used; +#ifdef FEAT_DIFF + if (wp->w_botline <= wp->w_buffer->b_ml.ml_line_count) + { + wp->w_filler_rows = diff_check_fill(wp, wp->w_botline); + if (wp->w_empty_rows > wp->w_filler_rows) + wp->w_empty_rows -= wp->w_filler_rows; + else + { + wp->w_filler_rows = wp->w_empty_rows; + wp->w_empty_rows = 0; + } + } +#endif + } +} + +/* + * Recompute topline to put the cursor at the bottom of the window. + * When scrolling scroll at least "min_scroll" lines. + * If "set_topbot" is TRUE, set topline and botline first (for "zb"). + * This is messy stuff!!! + */ + void +scroll_cursor_bot(int min_scroll, int set_topbot) +{ + int used; + int scrolled = 0; + int extra = 0; + int i; + linenr_T line_count; + linenr_T old_topline = curwin->w_topline; + int old_skipcol = curwin->w_skipcol; + lineoff_T loff; + lineoff_T boff; +#ifdef FEAT_DIFF + int old_topfill = curwin->w_topfill; + int fill_below_window; +#endif + linenr_T old_botline = curwin->w_botline; + linenr_T old_valid = curwin->w_valid; + int old_empty_rows = curwin->w_empty_rows; + linenr_T cln; // Cursor Line Number + long so = get_scrolloff_value(); + int do_sms = curwin->w_p_wrap && curwin->w_p_sms; + + cln = curwin->w_cursor.lnum; + if (set_topbot) + { + int set_skipcol = FALSE; + + used = 0; + curwin->w_botline = cln + 1; +#ifdef FEAT_DIFF + loff.fill = 0; +#endif + for (curwin->w_topline = curwin->w_botline; + curwin->w_topline > 1; + curwin->w_topline = loff.lnum) + { + loff.lnum = curwin->w_topline; + topline_back_winheight(&loff, FALSE); + if (loff.height == MAXCOL) + break; + if (used + loff.height > curwin->w_height) + { + if (do_sms) + { + // 'smoothscroll' and 'wrap' are set. The above line is + // too long to show in its entirety, so we show just a part + // of it. + if (used < curwin->w_height) + { + int plines_offset = used + loff.height + - curwin->w_height; + used = curwin->w_height; +#ifdef FEAT_DIFF + curwin->w_topfill = loff.fill; +#endif + curwin->w_topline = loff.lnum; + curwin->w_skipcol = skipcol_from_plines( + curwin, plines_offset); + set_skipcol = TRUE; + } + } + break; + } + used += loff.height; +#ifdef FEAT_DIFF + curwin->w_topfill = loff.fill; +#endif + } + set_empty_rows(curwin, used); + curwin->w_valid |= VALID_BOTLINE|VALID_BOTLINE_AP; + if (curwin->w_topline != old_topline +#ifdef FEAT_DIFF + || curwin->w_topfill != old_topfill +#endif + || set_skipcol + || curwin->w_skipcol != 0) + { + curwin->w_valid &= ~(VALID_WROW|VALID_CROW); + if (set_skipcol) + redraw_later(UPD_NOT_VALID); + else + reset_skipcol(); + } + } + else + validate_botline(); + + // The lines of the cursor line itself are always used. +#ifdef FEAT_DIFF + used = plines_nofill(cln); +#else + validate_cheight(); + used = curwin->w_cline_height; +#endif + + // If the cursor is on or below botline, we will at least scroll by the + // height of the cursor line, which is "used". Correct for empty lines, + // which are really part of botline. + if (cln >= curwin->w_botline) + { + scrolled = used; + if (cln == curwin->w_botline) + scrolled -= curwin->w_empty_rows; + if (do_sms) + { + // 'smoothscroll' and 'wrap' are set. + // Calculate how many screen lines the current top line of window + // occupies. If it is occupying more than the entire window, we + // need to scroll the additional clipped lines to scroll past the + // top line before we can move on to the other lines. + int top_plines = +#ifdef FEAT_DIFF + plines_win_nofill +#else + plines_win +#endif + (curwin, curwin->w_topline, FALSE); + int skip_lines = 0; + int width1 = curwin->w_width - curwin_col_off(); + if (width1 > 0) + { + int width2 = width1 + curwin_col_off2(); + // similar formula is used in curs_columns() + if (curwin->w_skipcol > width1) + skip_lines += (curwin->w_skipcol - width1) / width2 + 1; + else if (curwin->w_skipcol > 0) + skip_lines = 1; + + top_plines -= skip_lines; + if (top_plines > curwin->w_height) + { + scrolled += (top_plines - curwin->w_height); + } + } + } + } + + /* + * Stop counting lines to scroll when + * - hitting start of the file + * - scrolled nothing or at least 'sj' lines + * - at least 'scrolloff' lines below the cursor + * - lines between botline and cursor have been counted + */ +#ifdef FEAT_FOLDING + if (!hasFolding(curwin->w_cursor.lnum, &loff.lnum, &boff.lnum)) +#endif + { + loff.lnum = cln; + boff.lnum = cln; + } +#ifdef FEAT_DIFF + loff.fill = 0; + boff.fill = 0; + fill_below_window = diff_check_fill(curwin, curwin->w_botline) + - curwin->w_filler_rows; +#endif + + while (loff.lnum > 1) + { + // Stop when scrolled nothing or at least "min_scroll", found "extra" + // context for 'scrolloff' and counted all lines below the window. + if ((((scrolled <= 0 || scrolled >= min_scroll) + && extra >= (mouse_dragging > 0 ? mouse_dragging - 1 : so)) + || boff.lnum + 1 > curbuf->b_ml.ml_line_count) + && loff.lnum <= curwin->w_botline +#ifdef FEAT_DIFF + && (loff.lnum < curwin->w_botline + || loff.fill >= fill_below_window) +#endif + ) + break; + + // Add one line above + topline_back(&loff); + if (loff.height == MAXCOL) + used = MAXCOL; + else + used += loff.height; + if (used > curwin->w_height) + break; + if (loff.lnum >= curwin->w_botline +#ifdef FEAT_DIFF + && (loff.lnum > curwin->w_botline + || loff.fill <= fill_below_window) +#endif + ) + { + // Count screen lines that are below the window. + scrolled += loff.height; + if (loff.lnum == curwin->w_botline +#ifdef FEAT_DIFF + && loff.fill == 0 +#endif + ) + scrolled -= curwin->w_empty_rows; + } + + if (boff.lnum < curbuf->b_ml.ml_line_count) + { + // Add one line below + botline_forw(&boff); + used += boff.height; + if (used > curwin->w_height) + break; + if (extra < ( mouse_dragging > 0 ? mouse_dragging - 1 : so) + || scrolled < min_scroll) + { + extra += boff.height; + if (boff.lnum >= curwin->w_botline +#ifdef FEAT_DIFF + || (boff.lnum + 1 == curwin->w_botline + && boff.fill > curwin->w_filler_rows) +#endif + ) + { + // Count screen lines that are below the window. + scrolled += boff.height; + if (boff.lnum == curwin->w_botline +#ifdef FEAT_DIFF + && boff.fill == 0 +#endif + ) + scrolled -= curwin->w_empty_rows; + } + } + } + } + + // curwin->w_empty_rows is larger, no need to scroll + if (scrolled <= 0) + line_count = 0; + // more than a screenfull, don't scroll but redraw + else if (used > curwin->w_height) + line_count = used; + // scroll minimal number of lines + else + { + line_count = 0; +#ifdef FEAT_DIFF + boff.fill = curwin->w_topfill; +#endif + boff.lnum = curwin->w_topline - 1; + for (i = 0; i < scrolled && boff.lnum < curwin->w_botline; ) + { + botline_forw(&boff); + i += boff.height; + ++line_count; + } + if (i < scrolled) // below curwin->w_botline, don't scroll + line_count = 9999; + } + + /* + * Scroll up if the cursor is off the bottom of the screen a bit. + * Otherwise put it at 1/2 of the screen. + */ + if (line_count >= curwin->w_height && line_count > min_scroll) + scroll_cursor_halfway(FALSE, TRUE); + else if (line_count > 0) + { + if (do_sms) + scrollup(scrolled, TRUE); // TODO + else + scrollup(line_count, TRUE); + } + + /* + * If topline didn't change we need to restore w_botline and w_empty_rows + * (we changed them). + * If topline did change, update_screen() will set botline. + */ + if (curwin->w_topline == old_topline + && curwin->w_skipcol == old_skipcol + && set_topbot) + { + curwin->w_botline = old_botline; + curwin->w_empty_rows = old_empty_rows; + curwin->w_valid = old_valid; + } + curwin->w_valid |= VALID_TOPLINE; +} + +/* + * Recompute topline to put the cursor halfway the window + * If "atend" is TRUE, also put it halfway at the end of the file. + */ + void +scroll_cursor_halfway(int atend, int prefer_above) +{ + int above = 0; + linenr_T topline; + colnr_T skipcol = 0; +#ifdef FEAT_DIFF + int topfill = 0; +#endif + int below = 0; + int used; + lineoff_T loff; + lineoff_T boff; +#ifdef FEAT_DIFF + linenr_T old_topline = curwin->w_topline; +#endif + +#ifdef FEAT_PROP_POPUP + // if the width changed this needs to be updated first + may_update_popup_position(); +#endif + loff.lnum = boff.lnum = curwin->w_cursor.lnum; +#ifdef FEAT_FOLDING + (void)hasFolding(loff.lnum, &loff.lnum, &boff.lnum); +#endif +#ifdef FEAT_DIFF + used = plines_nofill(loff.lnum); + loff.fill = 0; + boff.fill = 0; +#else + used = plines(loff.lnum); +#endif + topline = loff.lnum; + + int want_height; + int do_sms = curwin->w_p_wrap && curwin->w_p_sms; + if (do_sms) + { + // 'smoothscroll' and 'wrap' are set + if (atend) + { + want_height = (curwin->w_height - used) / 2; + used = 0; + } + else + want_height = curwin->w_height; + } + + while (topline > 1) + { + // If using smoothscroll, we can precisely scroll to the + // exact point where the cursor is halfway down the screen. + if (do_sms) + { + topline_back_winheight(&loff, FALSE); + if (loff.height == MAXCOL) + break; + used += loff.height; + if (!atend && boff.lnum < curbuf->b_ml.ml_line_count) + { + botline_forw(&boff); + used += boff.height; + } + if (used > want_height) + { + if (used - loff.height < want_height) + { + topline = loff.lnum; +#ifdef FEAT_DIFF + topfill = loff.fill; +#endif + skipcol = skipcol_from_plines(curwin, used - want_height); + } + break; + } + topline = loff.lnum; +#ifdef FEAT_DIFF + topfill = loff.fill; +#endif + continue; + } + + // If not using smoothscroll, we have to iteratively find how many + // lines to scroll down to roughly fit the cursor. + // This may not be right in the middle if the lines' + // physical height > 1 (e.g. 'wrap' is on). + + // Depending on "prefer_above" we add a line above or below first. + // Loop twice to avoid duplicating code. + int done = FALSE; + for (int round = 1; round <= 2; ++round) + { + if (prefer_above ? (round == 2 && below < above) + : (round == 1 && below <= above)) + { + // add a line below the cursor + if (boff.lnum < curbuf->b_ml.ml_line_count) + { + botline_forw(&boff); + used += boff.height; + if (used > curwin->w_height) + { + done = TRUE; + break; + } + below += boff.height; + } + else + { + ++below; // count a "~" line + if (atend) + ++used; + } + } + + if (prefer_above ? (round == 1 && below >= above) + : (round == 1 && below > above)) + { + // add a line above the cursor + topline_back(&loff); + if (loff.height == MAXCOL) + used = MAXCOL; + else + used += loff.height; + if (used > curwin->w_height) + { + done = TRUE; + break; + } + above += loff.height; + topline = loff.lnum; +#ifdef FEAT_DIFF + topfill = loff.fill; +#endif + } + } + if (done) + break; + } + +#ifdef FEAT_FOLDING + if (!hasFolding(topline, &curwin->w_topline, NULL)) +#endif + { + if (curwin->w_topline != topline + || skipcol != 0 + || curwin->w_skipcol != 0) + { + curwin->w_topline = topline; + if (skipcol != 0) + { + curwin->w_skipcol = skipcol; + redraw_later(UPD_NOT_VALID); + } + else if (do_sms) + reset_skipcol(); + } + } +#ifdef FEAT_DIFF + curwin->w_topfill = topfill; + if (old_topline > curwin->w_topline + curwin->w_height) + curwin->w_botfill = FALSE; + check_topfill(curwin, FALSE); +#endif + curwin->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE|VALID_BOTLINE_AP); + curwin->w_valid |= VALID_TOPLINE; +} + +/* + * Correct the cursor position so that it is in a part of the screen at least + * 'scrolloff' lines from the top and bottom, if possible. + * If not possible, put it at the same position as scroll_cursor_halfway(). + * When called topline must be valid! + */ + void +cursor_correct(void) +{ + int above = 0; // screen lines above topline + linenr_T topline; + int below = 0; // screen lines below botline + linenr_T botline; + int above_wanted, below_wanted; + linenr_T cln; // Cursor Line Number + int max_off; + long so = get_scrolloff_value(); + + /* + * How many lines we would like to have above/below the cursor depends on + * whether the first/last line of the file is on screen. + */ + above_wanted = so; + below_wanted = so; + if (mouse_dragging > 0) + { + above_wanted = mouse_dragging - 1; + below_wanted = mouse_dragging - 1; + } + if (curwin->w_topline == 1) + { + above_wanted = 0; + max_off = curwin->w_height / 2; + if (below_wanted > max_off) + below_wanted = max_off; + } + validate_botline(); + if (curwin->w_botline == curbuf->b_ml.ml_line_count + 1 + && mouse_dragging == 0) + { + below_wanted = 0; + max_off = (curwin->w_height - 1) / 2; + if (above_wanted > max_off) + above_wanted = max_off; + } + + /* + * If there are sufficient file-lines above and below the cursor, we can + * return now. + */ + cln = curwin->w_cursor.lnum; + if (cln >= curwin->w_topline + above_wanted + && cln < curwin->w_botline - below_wanted +#ifdef FEAT_FOLDING + && !hasAnyFolding(curwin) +#endif + ) + return; + + if (curwin->w_p_sms && !curwin->w_p_wrap) + { + // 'smoothscroll' is active + if (curwin->w_cline_height == curwin->w_height) + { + // The cursor line just fits in the window, don't scroll. + reset_skipcol(); + return; + } + // TODO: If the cursor line doesn't fit in the window then only adjust + // w_skipcol. + } + + /* + * Narrow down the area where the cursor can be put by taking lines from + * the top and the bottom until: + * - the desired context lines are found + * - the lines from the top is past the lines from the bottom + */ + topline = curwin->w_topline; + botline = curwin->w_botline - 1; +#ifdef FEAT_DIFF + // count filler lines as context + above = curwin->w_topfill; + below = curwin->w_filler_rows; +#endif + while ((above < above_wanted || below < below_wanted) && topline < botline) + { + if (below < below_wanted && (below <= above || above >= above_wanted)) + { +#ifdef FEAT_FOLDING + if (hasFolding(botline, &botline, NULL)) + ++below; + else +#endif + below += plines(botline); + --botline; + } + if (above < above_wanted && (above < below || below >= below_wanted)) + { +#ifdef FEAT_FOLDING + if (hasFolding(topline, NULL, &topline)) + ++above; + else +#endif + above += PLINES_NOFILL(topline); +#ifdef FEAT_DIFF + // Count filler lines below this line as context. + if (topline < botline) + above += diff_check_fill(curwin, topline + 1); +#endif + ++topline; + } + } + if (topline == botline || botline == 0) + curwin->w_cursor.lnum = topline; + else if (topline > botline) + curwin->w_cursor.lnum = botline; + else + { + if (cln < topline && curwin->w_topline > 1) + { + curwin->w_cursor.lnum = topline; + curwin->w_valid &= + ~(VALID_WROW|VALID_WCOL|VALID_CHEIGHT|VALID_CROW); + } + if (cln > botline && curwin->w_botline <= curbuf->b_ml.ml_line_count) + { + curwin->w_cursor.lnum = botline; + curwin->w_valid &= + ~(VALID_WROW|VALID_WCOL|VALID_CHEIGHT|VALID_CROW); + } + } + curwin->w_valid |= VALID_TOPLINE; +} + +static void get_scroll_overlap(lineoff_T *lp, int dir); + +/* + * Move screen "count" pages up ("dir" is BACKWARD) or down ("dir" is FORWARD) + * and update the screen. + * + * Return FAIL for failure, OK otherwise. + */ + int +onepage(int dir, long count) +{ + long n; + int retval = OK; + lineoff_T loff; + linenr_T old_topline = curwin->w_topline; + long so = get_scrolloff_value(); + + if (curbuf->b_ml.ml_line_count == 1) // nothing to do + { + beep_flush(); + return FAIL; + } + + for ( ; count > 0; --count) + { + validate_botline(); + /* + * It's an error to move a page up when the first line is already on + * the screen. It's an error to move a page down when the last line + * is on the screen and the topline is 'scrolloff' lines from the + * last line. + */ + if (dir == FORWARD + ? ((curwin->w_topline >= curbuf->b_ml.ml_line_count - so) + && curwin->w_botline > curbuf->b_ml.ml_line_count) + : (curwin->w_topline == 1 +#ifdef FEAT_DIFF + && curwin->w_topfill == + diff_check_fill(curwin, curwin->w_topline) +#endif + )) + { + beep_flush(); + retval = FAIL; + break; + } + +#ifdef FEAT_DIFF + loff.fill = 0; +#endif + if (dir == FORWARD) + { + if (ONE_WINDOW && p_window > 0 && p_window < Rows - 1) + { + // Vi compatible scrolling + if (p_window <= 2) + ++curwin->w_topline; + else + curwin->w_topline += p_window - 2; + if (curwin->w_topline > curbuf->b_ml.ml_line_count) + curwin->w_topline = curbuf->b_ml.ml_line_count; + curwin->w_cursor.lnum = curwin->w_topline; + } + else if (curwin->w_botline > curbuf->b_ml.ml_line_count) + { + // at end of file + curwin->w_topline = curbuf->b_ml.ml_line_count; +#ifdef FEAT_DIFF + curwin->w_topfill = 0; +#endif + curwin->w_valid &= ~(VALID_WROW|VALID_CROW); + } + else + { + // For the overlap, start with the line just below the window + // and go upwards. + loff.lnum = curwin->w_botline; +#ifdef FEAT_DIFF + loff.fill = diff_check_fill(curwin, loff.lnum) + - curwin->w_filler_rows; +#endif + get_scroll_overlap(&loff, -1); + curwin->w_topline = loff.lnum; +#ifdef FEAT_DIFF + curwin->w_topfill = loff.fill; + check_topfill(curwin, FALSE); +#endif + curwin->w_cursor.lnum = curwin->w_topline; + curwin->w_valid &= ~(VALID_WCOL|VALID_CHEIGHT|VALID_WROW| + VALID_CROW|VALID_BOTLINE|VALID_BOTLINE_AP); + } + } + else // dir == BACKWARDS + { +#ifdef FEAT_DIFF + if (curwin->w_topline == 1) + { + // Include max number of filler lines + max_topfill(); + continue; + } +#endif + if (ONE_WINDOW && p_window > 0 && p_window < Rows - 1) + { + // Vi compatible scrolling (sort of) + if (p_window <= 2) + --curwin->w_topline; + else + curwin->w_topline -= p_window - 2; + if (curwin->w_topline < 1) + curwin->w_topline = 1; + curwin->w_cursor.lnum = curwin->w_topline + p_window - 1; + if (curwin->w_cursor.lnum > curbuf->b_ml.ml_line_count) + curwin->w_cursor.lnum = curbuf->b_ml.ml_line_count; + continue; + } + + // Find the line at the top of the window that is going to be the + // line at the bottom of the window. Make sure this results in + // the same line as before doing CTRL-F. + loff.lnum = curwin->w_topline - 1; +#ifdef FEAT_DIFF + loff.fill = diff_check_fill(curwin, loff.lnum + 1) + - curwin->w_topfill; +#endif + get_scroll_overlap(&loff, 1); + + if (loff.lnum >= curbuf->b_ml.ml_line_count) + { + loff.lnum = curbuf->b_ml.ml_line_count; +#ifdef FEAT_DIFF + loff.fill = 0; + } + else + { + botline_topline(&loff); +#endif + } + curwin->w_cursor.lnum = loff.lnum; + + // Find the line just above the new topline to get the right line + // at the bottom of the window. + n = 0; + while (n <= curwin->w_height && loff.lnum >= 1) + { + topline_back(&loff); + if (loff.height == MAXCOL) + n = MAXCOL; + else + n += loff.height; + } + if (loff.lnum < 1) // at begin of file + { + curwin->w_topline = 1; +#ifdef FEAT_DIFF + max_topfill(); +#endif + curwin->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE); + } + else + { + // Go two lines forward again. +#ifdef FEAT_DIFF + topline_botline(&loff); +#endif + botline_forw(&loff); + botline_forw(&loff); +#ifdef FEAT_DIFF + botline_topline(&loff); +#endif +#ifdef FEAT_FOLDING + // We're at the wrong end of a fold now. + (void)hasFolding(loff.lnum, &loff.lnum, NULL); +#endif + + // Always scroll at least one line. Avoid getting stuck on + // very long lines. + if (loff.lnum >= curwin->w_topline +#ifdef FEAT_DIFF + && (loff.lnum > curwin->w_topline + || loff.fill >= curwin->w_topfill) +#endif + ) + { +#ifdef FEAT_DIFF + // First try using the maximum number of filler lines. If + // that's not enough, backup one line. + loff.fill = curwin->w_topfill; + if (curwin->w_topfill < diff_check_fill(curwin, + curwin->w_topline)) + max_topfill(); + if (curwin->w_topfill == loff.fill) +#endif + { + --curwin->w_topline; +#ifdef FEAT_DIFF + curwin->w_topfill = 0; +#endif + curwin->w_valid &= ~(VALID_WROW|VALID_CROW); + } + comp_botline(curwin); + curwin->w_cursor.lnum = curwin->w_botline - 1; + curwin->w_valid &= + ~(VALID_WCOL|VALID_CHEIGHT|VALID_WROW|VALID_CROW); + } + else + { + curwin->w_topline = loff.lnum; +#ifdef FEAT_DIFF + curwin->w_topfill = loff.fill; + check_topfill(curwin, FALSE); +#endif + curwin->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE); + } + } + } + } +#ifdef FEAT_FOLDING + foldAdjustCursor(); +#endif + cursor_correct(); + check_cursor_col(); + if (retval == OK) + beginline(BL_SOL | BL_FIX); + curwin->w_valid &= ~(VALID_WCOL|VALID_WROW|VALID_VIRTCOL); + + if (retval == OK && dir == FORWARD) + { + // Avoid the screen jumping up and down when 'scrolloff' is non-zero. + // But make sure we scroll at least one line (happens with mix of long + // wrapping lines and non-wrapping line). + if (check_top_offset()) + { + scroll_cursor_top(1, FALSE); + if (curwin->w_topline <= old_topline + && old_topline < curbuf->b_ml.ml_line_count) + { + curwin->w_topline = old_topline + 1; +#ifdef FEAT_FOLDING + (void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL); +#endif + } + } +#ifdef FEAT_FOLDING + else if (curwin->w_botline > curbuf->b_ml.ml_line_count) + (void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL); +#endif + } + + redraw_later(UPD_VALID); + return retval; +} + +/* + * Decide how much overlap to use for page-up or page-down scrolling. + * This is symmetric, so that doing both keeps the same lines displayed. + * Three lines are examined: + * + * before CTRL-F after CTRL-F / before CTRL-B + * etc. l1 + * l1 last but one line ------------ + * l2 last text line l2 top text line + * ------------- l3 second text line + * l3 etc. + */ + static void +get_scroll_overlap(lineoff_T *lp, int dir) +{ + int h1, h2, h3, h4; + int min_height = curwin->w_height - 2; + lineoff_T loff0, loff1, loff2; + +#ifdef FEAT_DIFF + if (lp->fill > 0) + lp->height = 1; + else + lp->height = plines_nofill(lp->lnum); +#else + lp->height = plines(lp->lnum); +#endif + h1 = lp->height; + if (h1 > min_height) + return; // no overlap + + loff0 = *lp; + if (dir > 0) + botline_forw(lp); + else + topline_back(lp); + h2 = lp->height; + if (h2 == MAXCOL || h2 + h1 > min_height) + { + *lp = loff0; // no overlap + return; + } + + loff1 = *lp; + if (dir > 0) + botline_forw(lp); + else + topline_back(lp); + h3 = lp->height; + if (h3 == MAXCOL || h3 + h2 > min_height) + { + *lp = loff0; // no overlap + return; + } + + loff2 = *lp; + if (dir > 0) + botline_forw(lp); + else + topline_back(lp); + h4 = lp->height; + if (h4 == MAXCOL || h4 + h3 + h2 > min_height || h3 + h2 + h1 > min_height) + *lp = loff1; // 1 line overlap + else + *lp = loff2; // 2 lines overlap +} + +/* + * Scroll 'scroll' lines up or down. + */ + void +halfpage(int flag, linenr_T Prenum) +{ + long scrolled = 0; + int i; + int n; + int room; + + if (Prenum) + curwin->w_p_scr = (Prenum > curwin->w_height) ? + curwin->w_height : Prenum; + n = (curwin->w_p_scr <= curwin->w_height) ? + curwin->w_p_scr : curwin->w_height; + + update_topline(); + validate_botline(); + room = curwin->w_empty_rows; +#ifdef FEAT_DIFF + room += curwin->w_filler_rows; +#endif + if (flag) + { + /* + * scroll the text up + */ + while (n > 0 && curwin->w_botline <= curbuf->b_ml.ml_line_count) + { +#ifdef FEAT_DIFF + if (curwin->w_topfill > 0) + { + i = 1; + --n; + --curwin->w_topfill; + } + else +#endif + { + i = PLINES_NOFILL(curwin->w_topline); + n -= i; + if (n < 0 && scrolled > 0) + break; +#ifdef FEAT_FOLDING + (void)hasFolding(curwin->w_topline, NULL, &curwin->w_topline); +#endif + ++curwin->w_topline; +#ifdef FEAT_DIFF + curwin->w_topfill = diff_check_fill(curwin, curwin->w_topline); +#endif + + if (curwin->w_cursor.lnum < curbuf->b_ml.ml_line_count) + { + ++curwin->w_cursor.lnum; + curwin->w_valid &= + ~(VALID_VIRTCOL|VALID_CHEIGHT|VALID_WCOL); + } + } + curwin->w_valid &= ~(VALID_CROW|VALID_WROW); + scrolled += i; + + /* + * Correct w_botline for changed w_topline. + * Won't work when there are filler lines. + */ +#ifdef FEAT_DIFF + if (curwin->w_p_diff) + curwin->w_valid &= ~(VALID_BOTLINE|VALID_BOTLINE_AP); + else +#endif + { + room += i; + do + { + i = plines(curwin->w_botline); + if (i > room) + break; +#ifdef FEAT_FOLDING + (void)hasFolding(curwin->w_botline, NULL, + &curwin->w_botline); +#endif + ++curwin->w_botline; + room -= i; + } while (curwin->w_botline <= curbuf->b_ml.ml_line_count); + } + } + + /* + * When hit bottom of the file: move cursor down. + */ + if (n > 0) + { +# ifdef FEAT_FOLDING + if (hasAnyFolding(curwin)) + { + while (--n >= 0 + && curwin->w_cursor.lnum < curbuf->b_ml.ml_line_count) + { + (void)hasFolding(curwin->w_cursor.lnum, NULL, + &curwin->w_cursor.lnum); + ++curwin->w_cursor.lnum; + } + } + else +# endif + curwin->w_cursor.lnum += n; + check_cursor_lnum(); + } + } + else + { + /* + * scroll the text down + */ + while (n > 0 && curwin->w_topline > 1) + { +#ifdef FEAT_DIFF + if (curwin->w_topfill < diff_check_fill(curwin, curwin->w_topline)) + { + i = 1; + --n; + ++curwin->w_topfill; + } + else +#endif + { + i = PLINES_NOFILL(curwin->w_topline - 1); + n -= i; + if (n < 0 && scrolled > 0) + break; + --curwin->w_topline; +#ifdef FEAT_FOLDING + (void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL); +#endif +#ifdef FEAT_DIFF + curwin->w_topfill = 0; +#endif + } + curwin->w_valid &= ~(VALID_CROW|VALID_WROW| + VALID_BOTLINE|VALID_BOTLINE_AP); + scrolled += i; + if (curwin->w_cursor.lnum > 1) + { + --curwin->w_cursor.lnum; + curwin->w_valid &= ~(VALID_VIRTCOL|VALID_CHEIGHT|VALID_WCOL); + } + } + + /* + * When hit top of the file: move cursor up. + */ + if (n > 0) + { + if (curwin->w_cursor.lnum <= (linenr_T)n) + curwin->w_cursor.lnum = 1; + else +# ifdef FEAT_FOLDING + if (hasAnyFolding(curwin)) + { + while (--n >= 0 && curwin->w_cursor.lnum > 1) + { + --curwin->w_cursor.lnum; + (void)hasFolding(curwin->w_cursor.lnum, + &curwin->w_cursor.lnum, NULL); + } + } + else +# endif + curwin->w_cursor.lnum -= n; + } + } +# ifdef FEAT_FOLDING + // Move cursor to first line of closed fold. + foldAdjustCursor(); +# endif +#ifdef FEAT_DIFF + check_topfill(curwin, !flag); +#endif + cursor_correct(); + beginline(BL_SOL | BL_FIX); + redraw_later(UPD_VALID); +} + + void +do_check_cursorbind(void) +{ + static win_T *prev_curwin = NULL; + static pos_T prev_cursor = {0, 0, 0}; + + if (curwin == prev_curwin && EQUAL_POS(curwin->w_cursor, prev_cursor)) + return; + prev_curwin = curwin; + prev_cursor = curwin->w_cursor; + + linenr_T line = curwin->w_cursor.lnum; + colnr_T col = curwin->w_cursor.col; + colnr_T coladd = curwin->w_cursor.coladd; + colnr_T curswant = curwin->w_curswant; + int set_curswant = curwin->w_set_curswant; + win_T *old_curwin = curwin; + buf_T *old_curbuf = curbuf; + int old_VIsual_select = VIsual_select; + int old_VIsual_active = VIsual_active; + + /* + * loop through the cursorbound windows + */ + VIsual_select = VIsual_active = 0; + FOR_ALL_WINDOWS(curwin) + { + curbuf = curwin->w_buffer; + // skip original window and windows with 'nocursorbind' + if (curwin != old_curwin && curwin->w_p_crb) + { +# ifdef FEAT_DIFF + if (curwin->w_p_diff) + curwin->w_cursor.lnum = + diff_get_corresponding_line(old_curbuf, line); + else +# endif + curwin->w_cursor.lnum = line; + curwin->w_cursor.col = col; + curwin->w_cursor.coladd = coladd; + curwin->w_curswant = curswant; + curwin->w_set_curswant = set_curswant; + + // Make sure the cursor is in a valid position. Temporarily set + // "restart_edit" to allow the cursor to be beyond the EOL. + int restart_edit_save = restart_edit; + restart_edit = 'a'; + check_cursor(); + + // Avoid a scroll here for the cursor position, 'scrollbind' is + // more important. + if (!curwin->w_p_scb) + validate_cursor(); + + restart_edit = restart_edit_save; + // Correct cursor for multi-byte character. + if (has_mbyte) + mb_adjust_cursor(); + redraw_later(UPD_VALID); + + // Only scroll when 'scrollbind' hasn't done this. + if (!curwin->w_p_scb) + update_topline(); + curwin->w_redr_status = TRUE; + } + } + + /* + * reset current-window + */ + VIsual_select = old_VIsual_select; + VIsual_active = old_VIsual_active; + curwin = old_curwin; + curbuf = old_curbuf; +} |