Add appearance="multiline" to parameters of type string

Renders a Gtk::TextView that automatically fills the available
space in the extension's preferences dialog and can be used
to accept longer multi-line strings.

Newlines in the string value will be passed as "\\n" to the
extension script (i.e. literal '\n' with the backspace escaped).

1 files changed, 8 insertions, 2 deletions

diff --git a/src/extension/prefdialog/parameter-string.h b/src/extension/prefdialog/parameter-string.h
index ef1d48821..3af83111d 100644
--- a/src/extension/prefdialog/parameter-string.h
+++ b/src/extension/prefdialog/parameter-string.h
@@ -20,6 +20,10 @@ namespace Extension {
 
 class ParamString : public InxParameter {
 public:
+    enum AppearanceMode {
+        DEFAULT, MULTILINE
+    };
+
     ParamString(Inkscape::XML::Node *xml, Inkscape::Extension::Extension *ext);
 
     /** \brief  Returns \c _value, with a \i const to protect it. */
@@ -37,8 +41,10 @@ private:
     /** \brief  Internal value. */
     Glib::ustring _value;
 
-    /** \brief Maximum length of the string in characters (zero meaning unlimited).
-      */
+    /** appearance mode **/
+    AppearanceMode _mode = DEFAULT;
+
+    /** \brief Maximum length of the string in characters (zero meaning unlimited). */
     int _max_length = 0;
 };