Gradience/data/ui/presets_manager_window.blp

using Gtk 4.0;
using Adw 1;

template GradiencePresetWindow : Adw.Window {
  title: _("Presets");
  default-width: 700;
  default-height: 550;

  Adw.ToastOverlay toast_overlay {
    Adw.Leaflet leaflet {
      can-navigate-back: true;
      can-unfold: false;

      Gtk.Box main_view {
        orientation: vertical;

        Adw.HeaderBar titlebar {
          centering-policy: strict;

          [start]
          Button import_button {
            styles ["suggested-action"]
            label: _("Import");
            tooltip-text: _("Import a Preset File");
            clicked => on_import_button_clicked();
          }

          [start]
          Button remove_button {
            styles ["danger"]
            label: _("Delete");
            visible: false;
          }

          [title]
          Adw.ViewSwitcherTitle title {
            stack: view_stack;
          }

          [end]
          Button file_manager_button {
            tooltip-text: _("Open in File Manager");
            clicked => on_file_manager_button_clicked();
            Adw.ButtonContent {
              icon-name: "folder-symbolic";
            }
          }

        }

        Gtk.Box {
          orientation: vertical;

          Adw.ViewStack view_stack {
            vexpand: true;
            hexpand: true;

            Adw.ViewStackPage {
              name: "installed";
              title: _("Installed");
              icon-name: "larger-brush-symbolic";

              child: Adw.PreferencesPage installed { };

            }

            Adw.ViewStackPage {
              name: "explore";
              title: _("Explore");
              icon-name: "web-browser-symbolic";

              child: Gtk.ScrolledWindow {
                Adw.StatusPage {
                  title: _("Search for presets");
                  description: _("Enter a keyword to search on <a href=\"https://gradienceteam.github.io/presets\">GradienceTeam/Community</a>.");
                  valign: start;
                  Adw.Clamp {
                    styles ["clamp"]

                    Gtk.Box {
                      orientation: vertical;

                      Gtk.Box {
                        styles ["linked"]

                        Gtk.SearchEntry search_entry {
                          hexpand: true;
                          placeholder-text: _("e.g. \"Pretty Purple\"");
                        }

                        Gtk.DropDown search_dropdown {
                          model: StringList search_string_list {
                            strings [_("All")]
                          };
                        }
                      }

                      Gtk.Stack search_stack {
                        Gtk.StackPage {
                          name: "page_spinner";
                          child: Gtk.Spinner search_spinner {
                            valign: start;
                            halign: center;
                            spinning: true;
                          };
                        }

                        Gtk.StackPage {
                          name: "page_results";
                          child: Gtk.ListBox search_results {
                            styles ["boxed-list"]
                            valign: start;
                            selection-mode: none;
                          };
                        }

                        Gtk.StackPage {
                          name: "page_empty";
                          child: Adw.StatusPage {
                            icon-name: "system-search-symbolic";
                            title: _("No Results Found");
                          };
                        }

                        Gtk.StackPage {
                          name: "page_offline";
                          child: Adw.StatusPage {
                            icon-name: "network-wireless-offline-symbolic";
                            title: _("Offline");
                          };
                        }
                      }
                    }
                  }
                }
              };
            }

            Adw.ViewStackPage {
              name: "repos";
              title: _("Repositories");
              icon-name: "folder-symbolic";

              child: Adw.PreferencesPage repos { };

            }
          }

          Adw.ViewSwitcherBar {
            stack: view_stack;
            reveal: bind title.title-visible;
          }
        }
      }
    }
  }
}

Gtk.FileChooserNative import_file_chooser {
  title: _("Import a Preset File (*.json)");
  modal: true;
}

Gtk.FileFilter all_filter {
  name: _("All files");
  mime-types ["application/octet-stream"]
}

Gtk.FileFilter json_filter {
  name: _("JSON file (*.json)");
  mime-types ["application/json"]
}