Commit | Line | Data |
---|---|---|
f5bcab4b WJ |
1 | /* move4.c */ |
2 | ||
3 | /* Author: | |
4 | * Steve Kirkendall | |
5 | * 14407 SW Teal Blvd. #C | |
6 | * Beaverton, OR 97005 | |
7 | * kirkenda@cs.pdx.edu | |
8 | */ | |
9 | ||
10 | ||
11 | /* This file contains movement functions which are screen-relative */ | |
12 | ||
13 | #include "config.h" | |
14 | #include "vi.h" | |
15 | ||
16 | /* This moves the cursor to a particular row on the screen */ | |
17 | /*ARGSUSED*/ | |
18 | MARK m_row(m, cnt, key) | |
19 | MARK m; /* the cursor position */ | |
20 | long cnt; /* the row we'll move to */ | |
21 | int key; /* the keystroke of this move - H/L/M */ | |
22 | { | |
23 | DEFAULT(1); | |
24 | ||
25 | /* calculate destination line based on key */ | |
26 | cnt--; | |
27 | switch (key) | |
28 | { | |
29 | case 'H': | |
30 | cnt = topline + cnt; | |
31 | break; | |
32 | ||
33 | case 'M': | |
34 | cnt = topline + (LINES - 1) / 2; | |
35 | break; | |
36 | ||
37 | case 'L': | |
38 | cnt = botline - cnt; | |
39 | break; | |
40 | } | |
41 | ||
42 | /* return the mark of the destination line */ | |
43 | return MARK_AT_LINE(cnt); | |
44 | } | |
45 | ||
46 | ||
47 | /* This function repositions the current line to show on a given row */ | |
48 | MARK m_z(m, cnt, key) | |
49 | MARK m; /* the cursor */ | |
50 | long cnt; /* the line number we're repositioning */ | |
51 | int key; /* key struck after the z */ | |
52 | { | |
53 | long newtop; | |
54 | int i; | |
55 | ||
56 | /* Which line are we talking about? */ | |
57 | if (cnt < 0 || cnt > nlines) | |
58 | { | |
59 | return MARK_UNSET; | |
60 | } | |
61 | if (cnt) | |
62 | { | |
63 | m = MARK_AT_LINE(cnt); | |
64 | newtop = cnt; | |
65 | } | |
66 | else | |
67 | { | |
68 | newtop = markline(m); | |
69 | } | |
70 | ||
71 | /* allow a "window size" number to be entered */ | |
72 | for (i = 0; key >= '0' && key <= '9'; key = getkey(0)) | |
73 | { | |
74 | i = i * 10 + key - '0'; | |
75 | } | |
76 | #ifndef CRUNCH | |
77 | if (i > 0 && i <= LINES - 1) | |
78 | { | |
79 | *o_window = i; | |
80 | wset = TRUE; | |
81 | } | |
82 | #else | |
83 | /* the number is ignored if -DCRUNCH */ | |
84 | #endif | |
85 | ||
86 | /* figure out which line will have to be at the top of the screen */ | |
87 | switch (key) | |
88 | { | |
89 | case '\n': | |
90 | #if OSK | |
91 | case '\l': | |
92 | #else | |
93 | case '\r': | |
94 | #endif | |
95 | case '+': | |
96 | break; | |
97 | ||
98 | case '.': | |
99 | case 'z': | |
100 | newtop -= LINES / 2; | |
101 | break; | |
102 | ||
103 | case '-': | |
104 | newtop -= LINES - 1; | |
105 | break; | |
106 | ||
107 | default: | |
108 | return MARK_UNSET; | |
109 | } | |
110 | ||
111 | /* make the new topline take effect */ | |
112 | redraw(MARK_UNSET, FALSE); | |
113 | if (newtop >= 1) | |
114 | { | |
115 | topline = newtop; | |
116 | } | |
117 | else | |
118 | { | |
119 | topline = 1L; | |
120 | } | |
121 | redrawrange(0L, INFINITY, INFINITY); | |
122 | ||
123 | /* The cursor doesn't move */ | |
124 | return m; | |
125 | } | |
126 | ||
127 | ||
128 | /* This function scrolls the screen. It does this by calling redraw() with | |
129 | * an off-screen line as the argument. It will move the cursor if necessary | |
130 | * so that the cursor is on the new screen. | |
131 | */ | |
132 | /*ARGSUSED*/ | |
133 | MARK m_scroll(m, cnt, key) | |
134 | MARK m; /* the cursor position */ | |
135 | long cnt; /* for some keys: the number of lines to scroll */ | |
136 | int key; /* keystroke that causes this movement */ | |
137 | { | |
138 | MARK tmp; /* a temporary mark, used as arg to redraw() */ | |
139 | ||
140 | /* adjust cnt, and maybe *o_scroll, depending of key */ | |
141 | switch (key) | |
142 | { | |
143 | case ctrl('F'): | |
144 | case ctrl('B'): | |
145 | DEFAULT(1); | |
146 | redrawrange(0L, INFINITY, INFINITY); /* force complete redraw */ | |
147 | cnt = cnt * (LINES - 1) - 2; /* keeps two old lines on screen */ | |
148 | break; | |
149 | ||
150 | case ctrl('E'): | |
151 | case ctrl('Y'): | |
152 | DEFAULT(1); | |
153 | break; | |
154 | ||
155 | case ctrl('U'): | |
156 | case ctrl('D'): | |
157 | if (cnt == 0) /* default */ | |
158 | { | |
159 | cnt = *o_scroll; | |
160 | } | |
161 | else | |
162 | { | |
163 | if (cnt > LINES - 1) | |
164 | { | |
165 | cnt = LINES - 1; | |
166 | } | |
167 | *o_scroll = cnt; | |
168 | } | |
169 | break; | |
170 | } | |
171 | ||
172 | /* scroll up or down, depending on key */ | |
173 | switch (key) | |
174 | { | |
175 | case ctrl('B'): | |
176 | case ctrl('Y'): | |
177 | case ctrl('U'): | |
178 | cnt = topline - cnt; | |
179 | if (cnt < 1L) | |
180 | { | |
181 | cnt = 1L; | |
182 | m = MARK_FIRST; | |
183 | } | |
184 | tmp = MARK_AT_LINE(cnt) + markidx(m); | |
185 | redraw(tmp, FALSE); | |
186 | if (markline(m) > botline) | |
187 | { | |
188 | m = MARK_AT_LINE(botline); | |
189 | } | |
190 | break; | |
191 | ||
192 | case ctrl('F'): | |
193 | case ctrl('E'): | |
194 | case ctrl('D'): | |
195 | cnt = botline + cnt; | |
196 | if (cnt > nlines) | |
197 | { | |
198 | cnt = nlines; | |
199 | m = MARK_LAST; | |
200 | } | |
201 | tmp = MARK_AT_LINE(cnt) + markidx(m); | |
202 | redraw(tmp, FALSE); | |
203 | if (markline(m) < topline) | |
204 | { | |
205 | m = MARK_AT_LINE(topline); | |
206 | } | |
207 | break; | |
208 | } | |
209 | ||
210 | return m; | |
211 | } |