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author | Mystery Man <unknown@mandriva.org> | 2002-07-08 07:45:08 +0000 |
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committer | Mystery Man <unknown@mandriva.org> | 2002-07-08 07:45:08 +0000 |
commit | be128d0615965c467107adeb2c8cecd1125318a1 (patch) | |
tree | 998f5b6803ad85a1411491ef4c499fa8b9760bb2 /mdk-stage1/slang/slscroll.c | |
parent | 9555bb791920e8feace953f90cf908e864451b59 (diff) | |
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This commit was manufactured by cvs2svn to create tag 'V1_1_8_2mdk'.V1_1_8_2mdk
Diffstat (limited to 'mdk-stage1/slang/slscroll.c')
-rw-r--r-- | mdk-stage1/slang/slscroll.c | 450 |
1 files changed, 0 insertions, 450 deletions
diff --git a/mdk-stage1/slang/slscroll.c b/mdk-stage1/slang/slscroll.c deleted file mode 100644 index 358296116..000000000 --- a/mdk-stage1/slang/slscroll.c +++ /dev/null @@ -1,450 +0,0 @@ -/* SLang Scrolling Window Routines */ -/* Copyright (c) 1996, 1999, 2001 John E. Davis - * This file is part of the S-Lang library. - * - * You may distribute under the terms of either the GNU General Public - * License or the Perl Artistic License. - */ - -#include "slinclud.h" - -#include "slang.h" -#include "_slang.h" - -static void find_window_bottom (SLscroll_Window_Type *win) -{ - unsigned int nrows; - unsigned int hidden_mask; - SLscroll_Type *bot, *cline, *last_bot; - unsigned int row; - - nrows = win->nrows; - hidden_mask = win->hidden_mask; - cline = win->current_line; - - win->window_row = row = 0; - last_bot = bot = win->top_window_line; - - while (row < nrows) - { - if (bot == cline) - win->window_row = row; - - last_bot = bot; - - if (bot == NULL) - break; - - bot = bot->next; - - if (hidden_mask) - { - while ((bot != NULL) && (bot->flags & hidden_mask)) - bot = bot->next; - } - - row++; - } - - win->bot_window_line = last_bot; -} - -static int find_top_to_recenter (SLscroll_Window_Type *win) -{ - unsigned int nrows; - unsigned int hidden_mask; - SLscroll_Type *prev, *last_prev, *cline; - - nrows = win->nrows; - cline = win->current_line; - hidden_mask = win->hidden_mask; - - nrows = nrows / 2; - - last_prev = prev = cline; - - while (nrows && (prev != NULL)) - { - nrows--; - last_prev = prev; - do - { - prev = prev->prev; - } - while (hidden_mask - && (prev != NULL) - && (prev->flags & hidden_mask)); - } - - if (prev == NULL) prev = last_prev; - - win->top_window_line = prev; - find_window_bottom (win); - - return 0; -} - -#define HAS_BORDER_CODE 1 -int SLscroll_find_top (SLscroll_Window_Type *win) -{ - unsigned int i; - SLscroll_Type *cline, *prev, *next; - SLscroll_Type *top_window_line; - unsigned int nrows; - unsigned int hidden_mask; - int scroll_mode; - unsigned int border; - - cline = win->current_line; - nrows = win->nrows; - scroll_mode = win->cannot_scroll; - border = win->border; - if (scroll_mode == 2) - border = 0; - - if ((cline == NULL) || (nrows <= 1)) - { - win->top_window_line = cline; - find_window_bottom (win); - return 0; - } - - hidden_mask = win->hidden_mask; - - /* Note: top_window_line might be a bogus pointer. This means that I cannot - * access it unless it really corresponds to a pointer in the buffer. - */ - top_window_line = win->top_window_line; - - if (top_window_line == NULL) - return find_top_to_recenter (win); - - /* Chances are that the current line is visible in the window. This means - * that the top window line should be above it. - */ - prev = cline; - - i = 0; - - while ((i < nrows) && (prev != NULL)) - { - if (prev == top_window_line) - { - SLscroll_Type *twl = top_window_line; - int dir = 0; - - if (i < border) dir = -1; else if (i + border >= nrows) dir = 1; - - if (dir) while (border) - { - if (dir < 0) twl = twl->prev; - else twl = twl->next; - - if (twl == NULL) - { - twl = top_window_line; - break; - } - if ((hidden_mask == 0) - || (0 == (twl->flags & hidden_mask))) - border--; - } - - win->top_window_line = twl; - find_window_bottom (win); - return 0; - } - - do - { - prev = prev->prev; - } - while (hidden_mask - && (prev != NULL) - && (prev->flags & hidden_mask)); - i++; - } - - /* Now check the borders of the window. Perhaps the current line lies - * outsider the border by a line. Only do this if terminal can scroll. - */ - - if (scroll_mode == 1) - return find_top_to_recenter (win); - else if (scroll_mode == -1) - scroll_mode = 0; - - next = cline->next; - while (hidden_mask - && (next != NULL) - && (next->flags & hidden_mask)) - next = next->next; - - if ((next != NULL) - && (next == top_window_line)) - { - /* The current line is one line above the window. This means user - * has moved up past the top of the window. If scroll_mode is set - * to scroll by pages, we need to do a page up. - */ - - win->top_window_line = cline; - find_window_bottom (win); - - if (scroll_mode) return SLscroll_pageup (win); - - return 0; - } - - prev = cline->prev; - - while (hidden_mask - && (prev != NULL) - && (prev->flags & hidden_mask)) - prev = prev->prev; - - if ((prev == NULL) - || (prev != win->bot_window_line)) - return find_top_to_recenter (win); - - /* It looks like cline is below window by one line. See what line should - * be at top to scroll it into view. Only do this unless we are scrolling - * by pages. - */ - if (scroll_mode) - { - win->top_window_line = cline; - find_window_bottom (win); - return 0; - } - - i = 2; - while ((i < nrows) && (prev != NULL)) - { - do - { - prev = prev->prev; - } - while (hidden_mask - && (prev != NULL) - && (prev->flags & hidden_mask)); - i++; - } - - if (prev != NULL) - { - win->top_window_line = prev; - find_window_bottom (win); - return 0; - } - - return find_top_to_recenter (win); -} - -int SLscroll_find_line_num (SLscroll_Window_Type *win) -{ - SLscroll_Type *cline, *l; - unsigned int n; - unsigned int hidden_mask; - - if (win == NULL) return -1; - - hidden_mask = win->hidden_mask; - cline = win->current_line; - - n = 1; - - l = win->lines; - while (l != cline) - { - if ((hidden_mask == 0) - || (0 == (l->flags & hidden_mask))) - n++; - - l = l->next; - } - - win->line_num = n; - n--; - - while (l != NULL) - { - if ((hidden_mask == 0) - || (0 == (l->flags & hidden_mask))) - n++; - l = l->next; - } - win->num_lines = n; - - return 0; -} - -unsigned int SLscroll_next_n (SLscroll_Window_Type *win, unsigned int n) -{ - unsigned int i; - unsigned int hidden_mask; - SLscroll_Type *l, *cline; - - if ((win == NULL) - || (NULL == (cline = win->current_line))) - return 0; - - hidden_mask = win->hidden_mask; - l = cline; - i = 0; - while (i < n) - { - l = l->next; - while (hidden_mask - && (l != NULL) && (l->flags & hidden_mask)) - l = l->next; - - if (l == NULL) - break; - - i++; - cline = l; - } - - win->current_line = cline; - win->line_num += i; - return i; -} - -unsigned int SLscroll_prev_n (SLscroll_Window_Type *win, unsigned int n) -{ - unsigned int i; - unsigned int hidden_mask; - SLscroll_Type *l, *cline; - - if ((win == NULL) - || (NULL == (cline = win->current_line))) - return 0; - - hidden_mask = win->hidden_mask; - l = cline; - i = 0; - while (i < n) - { - l = l->prev; - while (hidden_mask - && (l != NULL) && (l->flags & hidden_mask)) - l = l->prev; - - if (l == NULL) - break; - - i++; - cline = l; - } - - win->current_line = cline; - win->line_num -= i; - return i; -} - -int SLscroll_pageup (SLscroll_Window_Type *win) -{ - SLscroll_Type *l, *top; - unsigned int nrows, hidden_mask; - unsigned int n; - - if (win == NULL) - return -1; - - (void) SLscroll_find_top (win); - - nrows = win->nrows; - - if ((NULL != (top = win->top_window_line)) - && (nrows > 2)) - { - n = 0; - hidden_mask = win->hidden_mask; - l = win->current_line; - while ((l != NULL) && (l != top)) - { - l = l->prev; - if ((hidden_mask == 0) - || ((l != NULL) && (0 == (l->flags & hidden_mask)))) - n++; - } - - if (l != NULL) - { - unsigned int save_line_num; - int ret = 0; - - win->current_line = l; - win->line_num -= n; - - /* Compute a new top/bottom header */ - save_line_num = win->line_num; - - if ((0 == SLscroll_prev_n (win, nrows - 1)) - && (n == 0)) - ret = -1; - - win->top_window_line = win->current_line; - win->current_line = l; - win->line_num = save_line_num; - - find_window_bottom (win); - return ret; - } - } - - if (nrows < 2) nrows++; - if (0 == SLscroll_prev_n (win, nrows - 1)) - return -1; - return 0; -} - -int SLscroll_pagedown (SLscroll_Window_Type *win) -{ - SLscroll_Type *l, *bot; - unsigned int nrows, hidden_mask; - unsigned int n; - - if (win == NULL) - return -1; - - (void) SLscroll_find_top (win); - - nrows = win->nrows; - - if ((NULL != (bot = win->bot_window_line)) - && (nrows > 2)) - { - n = 0; - hidden_mask = win->hidden_mask; - l = win->current_line; - while ((l != NULL) && (l != bot)) - { - l = l->next; - if ((hidden_mask == 0) - || ((l != NULL) && (0 == (l->flags & hidden_mask)))) - n++; - } - - if (l != NULL) - { - win->current_line = l; - win->top_window_line = l; - win->line_num += n; - - find_window_bottom (win); - - if (n || (bot != win->bot_window_line)) - return 0; - - return -1; - } - } - - if (nrows < 2) nrows++; - if (0 == SLscroll_next_n (win, nrows - 1)) - return -1; - return 0; -} - |