Fix compiling with --disable-locale

[ncmpc.git] / src / hscroll.c

diff --git a/src/hscroll.c b/src/hscroll.c
index 109293d3364254666aae645fb1c1c756fa739bf3..32988d0fdf6b1b895415079a7610e56577413114 100644 (file)
--- a/src/hscroll.c
+++ b/src/hscroll.c
@@ -28,32 +28,107 @@ strscroll(struct hscroll *hscroll, const char *str, const char *separator,
          unsigned width)
 {
        gchar *tmp, *buf;
-       gsize len, size, ulen;
 
        assert(hscroll != NULL);
        assert(str != NULL);
        assert(separator != NULL);
 
-       if (hscroll->offset == 0)
-               return g_strdup(str);
-
        /* create a buffer containing the string and the separator */
-       tmp = replace_locale_to_utf8(g_strconcat(str, separator, NULL));
-       len = utf8_width(tmp);
+       tmp = replace_locale_to_utf8(g_strconcat(str, separator,
+                                                str, separator, NULL));
 
-       if (hscroll->offset >= len)
+       if (hscroll->offset >= (unsigned)g_utf8_strlen(tmp, -1) / 2)
                hscroll->offset = 0;
 
        /* create the new scrolled string */
-       size = width+1;
-       buf = g_malloc(size * 6);// max length of utf8 char is 6
-       g_utf8_strncpy(buf, g_utf8_offset_to_pointer(tmp,
-                                                    hscroll->offset), size);
-       if ((ulen = g_utf8_strlen(buf, -1)) < width)
-               g_utf8_strncpy(buf + strlen(buf), tmp, size - ulen - 1);
+       buf = g_utf8_offset_to_pointer(tmp, hscroll->offset);
+       utf8_cut_width(buf, width);
 
+       /* convert back to locale */
+       buf = utf8_to_locale(buf);
        g_free(tmp);
-       tmp = utf8_to_locale(buf);
-       g_free(buf);
-       return tmp;
+       return buf;
+}
+
+/**
+ * This timer scrolls the area by one and redraws.
+ */
+static gboolean
+hscroll_timer_callback(gpointer data)
+{
+       struct hscroll *hscroll = data;
+
+       hscroll_step(hscroll);
+       hscroll_draw(hscroll);
+       wrefresh(hscroll->w);
+       return true;
+}
+
+void
+hscroll_set(struct hscroll *hscroll, unsigned x, unsigned y, unsigned width,
+           const char *text)
+{
+       assert(hscroll != NULL);
+       assert(hscroll->w != NULL);
+       assert(text != NULL);
+
+       if (hscroll->text != NULL && hscroll->x == x && hscroll->y == y &&
+           hscroll->width == width && strcmp(hscroll->text, text) == 0)
+               /* no change, do nothing (and, most importantly, do
+                  not reset the current offset!) */
+               return;
+
+       hscroll_clear(hscroll);
+
+       hscroll->x = x;
+       hscroll->y = y;
+       hscroll->width = width;
+
+       /* obtain the ncurses attributes and the current color, store
+          them */
+       wattr_get(hscroll->w, &hscroll->attrs, &hscroll->pair, NULL);
+
+       hscroll->text = g_strdup(text);
+       hscroll->offset = 0;
+       hscroll->source_id = g_timeout_add_seconds(1, hscroll_timer_callback,
+                                                  hscroll);
+}
+
+void
+hscroll_clear(struct hscroll *hscroll)
+{
+       assert(hscroll != NULL);
+
+       if (hscroll->text == NULL)
+               return;
+
+       g_source_remove(hscroll->source_id);
+
+       g_free(hscroll->text);
+       hscroll->text = NULL;
+}
+
+void
+hscroll_draw(struct hscroll *hscroll)
+{
+       attr_t old_attrs;
+       short old_pair;
+       char *p;
+
+       assert(hscroll != NULL);
+       assert(hscroll->w != NULL);
+       assert(hscroll->text != NULL);
+
+       /* set stored attributes and color */
+       wattr_get(hscroll->w, &old_attrs, &old_pair, NULL);
+       wattr_set(hscroll->w, hscroll->attrs, hscroll->pair, NULL);
+
+       /* scroll the string, and draw it */
+       p = strscroll(hscroll, hscroll->text, hscroll->separator,
+                     hscroll->width);
+       mvwaddstr(hscroll->w, hscroll->y, hscroll->x, p);
+       g_free(p);
+
+       /* restore previous attributes and color */
+       wattr_set(hscroll->w, old_attrs, old_pair, NULL);
 }