static void gui_vfslist_cursor_adjust ( struct gui_vfslist * gv ) [static]

Make sure the cursor resides inside the viewport. Move the viewport if not.

Definition at line 50 of file gui_vfslist.c.

00051 {
00052         struct vfsref *vr;
00053 
00054         /* Shortcut - nothing to adjust when the list is empty */
00055         if (gv->vr_selected == NULL)
00056                 return;
00057 
00058         /* Three possible cases here */
00059         if (gv->idx_top > gv->idx_selected) {
00060                 /*
00061                  * The entry is above the viewport. Move the viewport up
00062                  * so we can see it.
00063                  */
00064                 gv->vr_top = gv->vr_selected;
00065                 gv->idx_top = gv->idx_selected;
00066         } else if (gv->idx_top + gv->winheight <= gv->idx_selected) {
00067                 /*
00068                  * The entry is below the viewport. Start counting
00069                  * backward from the selected entry, so we can keep it
00070                  * just in screen. This is faster than counting forward,
00071                  * because there could be a lot of items in between.
00072                  */
00073                 gv->vr_top = gv->vr_selected;
00074                 gv->idx_top = gv->idx_selected;
00075                 do {
00076                         vr = vfs_list_prev(gv->vr_top);
00077                         if (vr == NULL)
00078                                 break;
00079                         gv->vr_top = vr;
00080                         gv->idx_top--;
00081                 } while (gv->idx_top + gv->winheight - 1 > gv->idx_selected);
00082         } else {
00083                 /*
00084                  * The item is in reach, but it could be possible that
00085                  * there is some blank space at the bottom. Move the
00086                  * viewport up, so we fill the terminal as much as
00087                  * possible.
00088                  */
00089                 while (gv->idx_top + gv->winheight - 1 > vfs_list_items(gv->list)) {
00090                         vr = vfs_list_prev(gv->vr_top);
00091                         if (vr == NULL)
00092                                 break;
00093                         gv->vr_top = vr;
00094                         gv->idx_top--;
00095                 }
00096         }
00097 }

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