lgui is a C++ 11/14 GUI currently coming with an Allegro 5 backend.

• easy to use signals & slots to connect widgets (just register something callable - a std::function)
• two pass layout system, Android style; separate widgets and layouts, nestable layouts
• drawing done in separate style classes
• internal drag and drop
• transformations
• animations
• modal widgets, GUI stacks
• event filters
• 9-patch images

Dark theme:

Bright theme:

React to button click:

button.on_activated.connect([this]() {
    do_something();    
});

Mirror text from a text input field in a text label somewhere else:

input.on_text_changed.connect([this](const std::string& text) {
    text_label.set_text(text);
});

Construct a relative layout:

using Constraint = lgui::RelativeLayout::Constraint;
lgui::RelativeLayout layout;
layout.add_item(bt1, { {Constraint::AlignParentTop} });
layout.add_item(bt2, { {Constraint::AlignLeft,  bt1}, {Constraint::Below, bt1} });
layout.add_item(bt3, { {Constraint::RightOf,    bt2}, {Constraint::Below, bt2} });
layout.add_item(bt4, { {Constraint::AlignRight, bt3}, {Constraint::Below, bt3},
                       {Constraint::AlignParentBottom } });
layout.add_item_ltrb(big_button, 0.7, 0.3, 0.9, 0.4);
container.set_layout(&layout);

You need to have Allegro5 and CMake installed; for the documentation, doxygen is needed as well.

The documentation has to be generated explicitly by issuing the make doc command from within your build directory.

Feel free to report any issues you might have. Or fix them right away ;) -- pull requests are welcome.