source: viewwin.c @ fa23002

release-1.7release-1.8release-1.9
Last change on this file since fa23002 was fa23002, checked in by David Benjamin <davidben@mit.edu>, 11 years ago
Never move the screen up when during an owl_viewwin_down We already can get in such a state, and a searchable popwin will be even easier. Mimic less's behavior here.
  • Property mode set to 100644
File size: 5.1 KB
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1#include <string.h>
2#include "owl.h"
3
4#define BOTTOM_OFFSET 1
5
6static void owl_viewwin_redraw(owl_window *w, WINDOW *curswin, void *user_data);
7static void owl_viewwin_set_window(owl_viewwin *v, owl_window *w);
8
9/* Create a viewwin.  'win' is an already initialized owl_window that
10 * will be used by the viewwin
11 */
12owl_viewwin *owl_viewwin_new_text(owl_window *win, const char *text)
13{
14  owl_viewwin *v = owl_malloc(sizeof(owl_viewwin));
15  memset(v, 0, sizeof(*v));
16  owl_fmtext_init_null(&(v->fmtext));
17  if (text) {
18    owl_fmtext_append_normal(&(v->fmtext), text);
19    if (text[0] != '\0' && text[strlen(text) - 1] != '\n') {
20      owl_fmtext_append_normal(&(v->fmtext), "\n");
21    }
22    v->textlines=owl_fmtext_num_lines(&(v->fmtext));
23  }
24  v->topline=0;
25  v->rightshift=0;
26  v->onclose_hook = NULL;
27
28  owl_viewwin_set_window(v, win);
29  return v;
30}
31
32void owl_viewwin_append_text(owl_viewwin *v, const char *text) {
33    owl_fmtext_append_normal(&(v->fmtext), text);
34    v->textlines=owl_fmtext_num_lines(&(v->fmtext));
35    owl_viewwin_dirty(v);
36}
37
38/* Schedule a redraw of 'v'. Exported for hooking into the search
39   string; when we have some way of listening for changes, this can be
40   removed. */
41void owl_viewwin_dirty(owl_viewwin *v)
42{
43  if (v->window)
44    owl_window_dirty(v->window);
45}
46
47/* Create a viewwin.  'win' is an already initialized owl_window that
48 * will be used by the viewwin
49 */
50owl_viewwin *owl_viewwin_new_fmtext(owl_window *win, const owl_fmtext *fmtext)
51{
52  char *text;
53  owl_viewwin *v = owl_malloc(sizeof(owl_viewwin));
54  memset(v, 0, sizeof(*v));
55
56  owl_fmtext_copy(&(v->fmtext), fmtext);
57  text = owl_fmtext_print_plain(fmtext);
58  if (text[0] != '\0' && text[strlen(text) - 1] != '\n') {
59      owl_fmtext_append_normal(&(v->fmtext), "\n");
60  }
61  owl_free(text);
62  v->textlines=owl_fmtext_num_lines(&(v->fmtext));
63  v->topline=0;
64  v->rightshift=0;
65
66  owl_viewwin_set_window(v, win);
67  return v;
68}
69
70static void owl_viewwin_set_window(owl_viewwin *v, owl_window *w)
71{
72  v->window = w;
73  if (w) {
74    g_object_ref(v->window);
75    v->sig_redraw_id = g_signal_connect(w, "redraw", G_CALLBACK(owl_viewwin_redraw), v);
76  }
77}
78
79void owl_viewwin_set_onclose_hook(owl_viewwin *v, void (*onclose_hook) (owl_viewwin *vwin, void *data), void *onclose_hook_data) {
80  v->onclose_hook = onclose_hook;
81  v->onclose_hook_data = onclose_hook_data;
82}
83
84/* regenerate text on the curses window. */
85static void owl_viewwin_redraw(owl_window *w, WINDOW *curswin, void *user_data)
86{
87  owl_fmtext fm1, fm2;
88  owl_viewwin *v = user_data;
89  int winlines, wincols;
90
91  owl_window_get_position(w, &winlines, &wincols, 0, 0);
92 
93  werase(curswin);
94  wmove(curswin, 0, 0);
95
96  owl_fmtext_init_null(&fm1);
97  owl_fmtext_init_null(&fm2);
98 
99  owl_fmtext_truncate_lines(&(v->fmtext), v->topline, winlines-BOTTOM_OFFSET, &fm1);
100  owl_fmtext_truncate_cols(&fm1, v->rightshift, wincols-1+v->rightshift, &fm2);
101
102  owl_fmtext_curs_waddstr(&fm2, curswin);
103
104  /* print the message at the bottom */
105  wmove(curswin, winlines-1, 0);
106  wattrset(curswin, A_REVERSE);
107  if (v->textlines - v->topline > winlines-BOTTOM_OFFSET) {
108    waddstr(curswin, "--More-- (Space to see more, 'q' to quit)");
109  } else {
110    waddstr(curswin, "--End-- (Press 'q' to quit)");
111  }
112  wattroff(curswin, A_REVERSE);
113
114  owl_fmtext_cleanup(&fm1);
115  owl_fmtext_cleanup(&fm2);
116}
117
118void owl_viewwin_down(owl_viewwin *v, int amount) {
119  int winlines;
120  owl_window_get_position(v->window, &winlines, 0, 0, 0);
121  /* Don't scroll past the bottom. */
122  amount = MIN(amount, v->textlines - (v->topline + winlines - BOTTOM_OFFSET));
123  /* But if we're already past the bottom, don't back up either. */
124  if (amount > 0) {
125    v->topline += amount;
126    owl_viewwin_dirty(v);
127  }
128}
129
130void owl_viewwin_up(owl_viewwin *v, int amount)
131{
132  v->topline -= amount;
133  if (v->topline<0) v->topline=0;
134  owl_viewwin_dirty(v);
135}
136
137void owl_viewwin_pagedown(owl_viewwin *v)
138{
139  int winlines;
140  owl_window_get_position(v->window, &winlines, 0, 0, 0);
141  owl_viewwin_down(v, winlines - BOTTOM_OFFSET);
142}
143
144void owl_viewwin_linedown(owl_viewwin *v)
145{
146  owl_viewwin_down(v, 1);
147}
148
149void owl_viewwin_pageup(owl_viewwin *v)
150{
151  int winlines;
152  owl_window_get_position(v->window, &winlines, 0, 0, 0);
153  owl_viewwin_up(v, winlines - BOTTOM_OFFSET);
154}
155
156void owl_viewwin_lineup(owl_viewwin *v)
157{
158  owl_viewwin_up(v, 1);
159}
160
161void owl_viewwin_right(owl_viewwin *v, int n)
162{
163  v->rightshift+=n;
164  owl_viewwin_dirty(v);
165}
166
167void owl_viewwin_left(owl_viewwin *v, int n)
168{
169  v->rightshift-=n;
170  if (v->rightshift<0) v->rightshift=0;
171  owl_viewwin_dirty(v);
172}
173
174void owl_viewwin_top(owl_viewwin *v)
175{
176  v->topline=0;
177  v->rightshift=0;
178  owl_viewwin_dirty(v);
179}
180
181void owl_viewwin_bottom(owl_viewwin *v)
182{
183  int winlines;
184  owl_window_get_position(v->window, &winlines, 0, 0, 0);
185  v->topline = v->textlines - winlines + BOTTOM_OFFSET;
186  owl_viewwin_dirty(v);
187}
188
189void owl_viewwin_delete(owl_viewwin *v)
190{
191  if (v->onclose_hook) {
192    v->onclose_hook(v, v->onclose_hook_data);
193    v->onclose_hook = NULL;
194    v->onclose_hook_data = NULL;
195  }
196  if (v->window) {
197    g_signal_handler_disconnect(v->window, v->sig_redraw_id);
198    g_object_unref(v->window);
199    v->window = NULL;
200  }
201  owl_fmtext_cleanup(&(v->fmtext));
202  owl_free(v);
203}
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