Btk

Btk is a C++ tiny retained mode GUI library based on SDL2 and nanovg.

It was written in morden C++,so it was very easy to use.

Still developing

CI

Platform	CI Status
Linux
Windows

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Tiny example

Just create a window and add widget on here

//Include all headers
#include <Btk.hpp>

using Btk::Library;
using Btk::Window;
using Btk::Button;

struct App:public Window{
    App():Window("Hello World",100,100){
        //Add a button and connect signal
        auto &btn = add<Button>("Close the window");
        //Or
        // auto *btn = new Button("Close the window");
        // add(btn);
        
        // Set the button's position and size
        btn.set_rect(0,0,100,100);

        //You can connect to a limbda
        // btn.signal_clicked().connect([this](){
        //     close();
        // });
        //Or connect to a member fucnction
        btn.signal_clicked().connect(
            &App::close,
            this
        );
        //when the object was destroyed,
        //The connection will be disconnected automatically
    }
};
int main(){
    Library lib;//< For initialize / Quit 
    //Or call Init() and Quit() explicitly
    App app;
    app.mainloop();
}

---

Features

• Almost no macro,the signal system was written in template
• The Library will use the font in os
• UTF-8 support

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TODO List

• Add more useful widgets
• MessageLoop need to be refactored
• Rewrite ImageView By OpenGL to implement AntiAlias
• Add CMake
• Add GLX and WGL OpenGL Adapter
• Add API to get system color and system metrics
• Widget Interface need to be refactored
• String Interface need to be refactored to fit STL
• Font need to be refactored,Current font backend is not good enough(need hb support)
• Renderer backend DPI support

---

Widgets List

Widgets	Done?	TODO	Description
Button
RadioButton
CheckButton
ImageView
TextBox		Refactoring
ProgressBar
EmbedWindow	No
ScrollBar
SilderBar
Canvas
GLCanvas
GLWidget	No
Label
Line
Layout
BoxLayout
StackedWidget

---

Renderer Backend

Backend	Done?	Description
Vulkan	No
Software		Has many bugs
OpenGLESv3
Direct3D11
SDLRender	No

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Building prerequisites

Linux

• G++ with C++17 support
• SDL2
• SDL2-image (optional)
• fontconfig (optional,for select font)
• libgif (optional,for display gif)
• freetype2 (optional)
• scons or xmake

Windows

• MINGW or vs2017
• SDL2
• SDL2-image (optional)
• freetype2 (optional)
• libgif (optional)
• scons or xmake

Android

• Still developing

---

Build

btk@btk:sudo apt install libsdl2-dev
btk@btk:scons

or

xmake

ThirdParty

SDL2 - For Event Handling
SDL_image (optional) - Load image
stb (optional) - Load image,render font,textbox edit etc...
nanovg - Render UI

etc...

License

MIT

Some md for dev

Folder strucutre