src/ui/text_filter.h

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 //
   3 // Text-matching filter
   4
   5 #ifndef _TEXTMATCHINGFILTER_H_
   6 #define _TEXTMATCHINGFILTER_H_
   7
   8 #include <glibmm/refptr.h>
   9 #include <glibmm/ustring.h>
  10 #include <gtkmm/boolfilter.h>
  11 #include <gtkmm/filter.h>
  12
  13 namespace Inkscape::UI {
  14
  15 class TextMatchingFilter {
  16 public:
  17     TextMatchingFilter(std::function<Glib::ustring (const Glib::RefPtr<Glib::ObjectBase>& item)> get_text_to_match):
  18         _get_text(std::move(get_text_to_match)) {
  19
  20         auto expression = Gtk::ClosureExpression<bool>::create([this](auto& item){
  21             if (_search_text.empty()) return true;
  22
  23             auto text = _get_text(item).lowercase();
  24             return text.find(_search_text) != Glib::ustring::npos;
  25         });
  26
  27         _filter = Gtk::BoolFilter::create(expression);
  28     }
  29
  30     void refilter(const Glib::ustring& search) {
  31         _search_text = search.lowercase();
  32         Gtk::Filter* f = _filter.get();
  33         gtk_filter_changed(f->gobj(), GtkFilterChange::GTK_FILTER_CHANGE_DIFFERENT);
  34     }
  35
  36     Glib::RefPtr<Gtk::Filter> get_filter() const {
  37         return _filter;
  38     }
  39
  40 private:
  41     std::function<Glib::ustring (const Glib::RefPtr<Glib::ObjectBase>& item)> _get_text;
  42     Glib::RefPtr<Gtk::BoolFilter> _filter;
  43     Glib::ustring _search_text;
  44 };
  45
  46 } // namespace
  47
  48 #endif