diff options
Diffstat (limited to 'crawl-ref/source/menu.cc')
-rw-r--r-- | crawl-ref/source/menu.cc | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/crawl-ref/source/menu.cc b/crawl-ref/source/menu.cc index 7d35711662..4531e35766 100644 --- a/crawl-ref/source/menu.cc +++ b/crawl-ref/source/menu.cc @@ -1161,6 +1161,67 @@ bool formatted_scroller::jump_to( int i ) return true; } +// Don't scroll past MEL_TITLE entries +bool formatted_scroller::page_down() +{ + const int old_first = first_entry; + + if ( (int)items.size() <= first_entry + pagesize ) + return false; + + // If, when scrolling forward, we encounter a MEL_TITLE + // somewhere in the newly displayed page, stop scrolling + // just before it becomes visible + int target; + for (target = first_entry; target < first_entry + pagesize; ++target ) + { + const int offset = target + pagesize - 1; + if (offset < (int)items.size() && items[offset]->level == MEL_TITLE) + break; + } + first_entry = target; + return (old_first != first_entry); +} + +bool formatted_scroller::page_up() +{ + int old_first = first_entry; + + // If, when scrolling backward, we encounter a MEL_TITLE + // somewhere in the newly displayed page, stop scrolling + // just before it becomes visible + + + for ( int i = 0; i < pagesize; ++i ) + { + if (first_entry == 0 || items[first_entry-1]->level == MEL_TITLE) + break; + --first_entry; + } + return (old_first != first_entry); +} + +bool formatted_scroller::line_down() +{ + if (first_entry + pagesize < (int) items.size() && + items[first_entry + pagesize]->level != MEL_TITLE ) + { + ++first_entry; + return true; + } + return false; +} + +bool formatted_scroller::line_up() +{ + if (first_entry > 0 && items[first_entry-1]->level != MEL_TITLE) + { + --first_entry; + return true; + } + return false; +} + bool formatted_scroller::process_key( int keyin ) { |