diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/Fl_Tree.cxx | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/Fl_Tree.cxx b/src/Fl_Tree.cxx index 7704de04d..7b8ffdc75 100644 --- a/src/Fl_Tree.cxx +++ b/src/Fl_Tree.cxx @@ -520,6 +520,7 @@ int Fl_Tree::handle(int e) { case FL_KP_Enter: if ( when() & ~FL_WHEN_ENTER_KEY) { select_only(_item_focus); + show_item(_item_focus); // STR #2426 return(1); } break; @@ -789,6 +790,27 @@ void Fl_Tree::show_item(Fl_Tree_Item *item, int yoff) { redraw(); } +/// See if \p item is currently displayed on-screen (visible within the widget). +/// This can be used to detect if the item is scrolled off-screen. +/// Checks to see if the item's vertical position is within the top and bottom +/// edges of the display window. This does NOT take into account the hide()/show() +/// status of the item. +/// +int Fl_Tree::displayed(Fl_Tree_Item *item) { + return( (item->y() >= y() && item->y() <= (y()+h()-item->h())) ? 1 : 0); +} + +/// Adjust the vertical scroll bar to show \p item at the top +/// of the display IF it is currently off-screen (eg. show_item_top()). +/// If it is already on-screen, no change is made. +/// +/// \see show_item_top(), show_item_middle(), show_item_bottom() +/// +void Fl_Tree::show_item(Fl_Tree_Item *item) { + if ( displayed(item) ) return; + show_item_top(item); +} + /// Adjust the vertical scrollbar so that \p item is at the top of the display. void Fl_Tree::show_item_top(Fl_Tree_Item *item) { item = item ? item : first(); |