Btk

Fast, lightweight and easy to use UIToolkit for building user interfaces.

Written in C++17

Its goal is less dependency and mini

CI

Platform	CI Status
Linux	CI TODO
Windows

ScreenShoot

Example

Create a button on window

#include <Btk/context.hpp> //< For UIContext
#include <Btk/comctl.hpp> //< Base widget & comctl

using namespace BTK_NAMESPACE; //< The namespace is configurable, default in Btk

class App : public Widget {
    public:
        App() {
            set_window_title("My Window");

            btn.set_text("Hello,click to close the window");
            btn.signal_clicked().connect(&App::on_button_clicked, this);
            // Also it can connect to lambda function or a callable
        }
        void on_button_clicked() {
            close();
        }
    private:
        // Add some widget on the root
        Button btn{this};
        // Or new like this
        // new Button(this);
};

int main() {

#if 0
    auto your_graphics_driver = new YourDriver();
    UIContext ctxt(your_graphics_driver);
#else
    UIContext ctxt;
#endif

    App app;
    app.show();

    return ctxt.run();
}

Features

• Utf8 support
• Cross platform
• Template based signal system
• HI-DPI Support
• No external dependencies on windows

Add this packages

In XMake

add_repositories("btk-project https://github.com/Btk-Project/xmake-repo")
add_requires("btk")
add_packages("btk")

Painter backend

Name	Platform	Description
Direct2D	Windows	Native painter on windows
Cairo	X11 (Xlib)	Unix painter
Nanovg	OpenGL	Cross platform painter (imcompeleted)

Font backend

Name	Platform	Description
DWrite	Windows	Native font backend on windows
Freetype	Any	In Progress

Window system backend

Name	Platform	Description
Win32	Windows
SDL2	Any

Widgets

Name	Done	TODO / Description
Button
RadioButton
ComboBox
TextEdit	Half	Single line, need multi support
Slider
ScrollBar
ProgressBar
Label
ImageView		Can play gif
PopupWidget
PopupMenu
FileDialog
Menu
MenuBar
MainWindow
TabWidget
TabBar
StackedWidget
GLWidget		For use OpenGL
ListBox		Display string items
VideoWidget		Video output for MediaPlayer (multimedia plugin)
WebView		CoreWebView2 on Win32 (webview plugin)

Existing bugs

• IME disappearence when has Win32 child window (SDL backend)
• Focus does gained for once mouse click when has Win32 child window (SDL backend)
• Render Wrong on clip, maybe matrix or paint backend has bug?

Todo List

• Compelete PainterEffect, refactorying it
• Compelete Nanovg Painter
• Improve Style
• Focus Conflict for System Window System & Logical Widget System (We used a dirty way to handle it)

Install

• Linux

$ apt install libcairo2-dev libpango1.0-dev libsdl2-dev

LICENSE

MIT License