Blueprint

A markup language for GTK user interface files.

Motivation

GtkBuilder XML format is quite verbose, and many app developers don't like using WYSIWYG editors for creating UIs. Blueprint files are intended to be a concise, easy-to-read format that makes it easier to create and edit GTK UIs.

Internally, it compiles to GtkBuilder XML as part of an app's build system. It adds no new features, just makes the features that exist more accessible.

Another goal is to have excellent developer tooling--including a language server--so that less knowledge of the format is required. Hopefully this will increase adoption of cool advanced features like GtkExpression.

Example

Here is what the libshumate demo's UI definition looks like ported to this new format:

using Gtk 4.0;
using Shumate 1.0;

template ShumateDemoWindow : Gtk.ApplicationWindow {
  can-focus: yes;
  title: _("Shumate Demo");
  default-width: 800;
  default-height: 600;

  [titlebar]
  Gtk.HeaderBar {
    Gtk.DropDown layers_dropdown {
      notify::selected => on_layers_dropdown_notify_selected() swapped;
    }
  }

  Gtk.Overlay overlay {
    vexpand: true;
    Shumate.Map map {}

    [overlay]
    Shumate.Scale scale {
      halign: start;
      valign: end;
    }

    [overlay]
    Gtk.Box {
      orientation: vertical;
      halign: end;
      valign: end;

      Shumate.Compass compass {
        halign: end;
        map: map;
      }
      Shumate.License license {
        halign: end;
      }
    }
  }
}

License

Copyright (C) 2021 James Westman james@jwestman.net

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this program. If not, see https://www.gnu.org/licenses/.

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