Add a selection_cleared signal to List

[libs/gltk.git] / source / list.cpp

diff --git a/source/list.cpp b/source/list.cpp
index f61d7c26dec8f3ba194058050a4411f423e6e646..0f887f3a6641316a6610da9f403a4bc5abefb7f4 100644 (file)
--- a/source/list.cpp
+++ b/source/list.cpp
@@ -147,13 +147,16 @@ void List::set_selected_index(int i)
        if(i>=static_cast<int>(data->size()))
                throw out_of_range("List::set_selected_index");
 
-       if(i==sel_index)
+       if(i==sel_index || (i<0 && sel_index<0))
                return;
 
        if(sel_index>=0)
                items[sel_index]->set_active(false);
        if(i<0)
+       {
                sel_index = -1;
+               signal_selection_cleared.emit();
+       }
        else
        {
                sel_index = i;
@@ -312,6 +315,7 @@ void List::DataObserver::item_added(unsigned i)
 
 void List::DataObserver::item_removed(unsigned i)
 {
+       bool had_selection = (list.sel_index>=0);
        if(list.sel_index>static_cast<int>(i))
                --list.sel_index;
        else if(list.sel_index==static_cast<int>(i))
@@ -320,6 +324,9 @@ void List::DataObserver::item_removed(unsigned i)
        delete list.items[i];
        list.items.erase(list.items.begin()+i);
        list.items_changed();
+
+       if(had_selection && list.sel_index<0)
+               list.signal_selection_cleared.emit();
 }
 
 void List::DataObserver::cleared()
@@ -329,6 +336,8 @@ void List::DataObserver::cleared()
                delete *i;
        list.items.clear();
        list.items_changed();
+
+       list.signal_selection_cleared.emit();
 }
 
 void List::DataObserver::refresh_item(unsigned i)