support submit2 for EditFields

docs/Lua API.rst

@@ -3882,6 +3882,7 @@ Attributes:
           If it returns false, the character is ignored.
 :on_change: Change notification callback; used as ``on_change(new_text,old_text)``.
 :on_submit: Enter key callback; if set the field will handle the key and call ``on_submit(text)``.
+:on_submit2: Shift-Enter key callback; if set the field will handle the key and call ``on_submit2(text)``.
 :key: If specified, the field is disabled until this key is pressed. Must be given as a string.
 :key_sep: If specified, will be used to customize how the activation key is
           displayed. See ``token.key_sep`` in the ``Label`` documentation below.

library/lua/gui/widgets.lua

@@ -184,6 +184,7 @@ EditField.ATTRS{
     on_char = DEFAULT_NIL,
     on_change = DEFAULT_NIL,
     on_submit = DEFAULT_NIL,
+    on_submit2 = DEFAULT_NIL,
     key = DEFAULT_NIL,
     key_sep = DEFAULT_NIL,
     frame = {h=1},
@@ -253,6 +254,17 @@ function EditField:onInput(keys)
         return not not self.key
     end
 
+    if keys.SEC_SELECT then
+        if self.key then
+            self:setFocus(false)
+        end
+        if self.on_submit2 then
+            self.on_submit2(self.text)
+            return true
+        end
+        return not not self.key
+    end
+
     if keys._STRING then
         local old = self.text
         if keys._STRING == 0 then