Class Button

src/Abyss/UI/Button.h:15–108

enum class ButtonState { Normal, Pressed, Disabled };

template <Concepts::Drawable T> class Button {
    T _drawable;
    ButtonDef _def;
    ButtonState _state;
    std::string _text;
    Label _label;
    std::function<void()> _onClick;
    bool _hasFocus{false};
    bool _canFocus{false};
    Streams::SoundEffect _clickSound;

    void handleMouse(const int x, const int y) {
        const auto mouseState = Singletons::getMouseProvider().getMouseState();
        int mouseX, mouseY;
        mouseState.getPosition(mouseX, mouseY);
        const auto leftMousePressed = mouseState.isButtonPressed(Enums::MouseButton::Left);

        mouseX -= x;
        mouseY -= y;
        const auto isMouseOver = mouseX >= _def.clickableRect.x && mouseX <= _def.clickableRect.x + _def.clickableRect.w && mouseY >= _def.clickableRect.y &&
                                 mouseY <= _def.clickableRect.y + _def.clickableRect.h;

        if (isMouseOver && !leftMousePressed && _hasFocus) {
            _onClick();
            _hasFocus = false;
            _state = ButtonState::Normal; // TODO: Disabled state
        }

        if (isMouseOver && leftMousePressed && !_hasFocus && _canFocus) {
            _hasFocus = true;
            _clickSound.play();
        }

        if (!_hasFocus)
            _canFocus = !leftMousePressed;

        if (!leftMousePressed) {
            _hasFocus = false;
            _canFocus = true;
        }

        _state = isMouseOver && leftMousePressed && _canFocus ? ButtonState::Pressed : ButtonState::Normal;
    }

  public:
    explicit Button(const ButtonDef &buttonDef, const std::string_view text, const Concepts::FontRenderer &fontRenderer, std::function<void()> onClick)
        : _drawable(buttonDef.resourceName), _def(buttonDef), _state(ButtonState::Normal), _text(text), _label(fontRenderer), _onClick(std::move(onClick)),
          _clickSound(std::make_unique<Streams::AudioStream>(Singletons::getFileProvider().loadFile(buttonDef.clickSound))) {
        _drawable.setPalette(_def.palette);
        _label.setText(_text);
    }

    auto draw(const int x, const int y) -> void {
        handleMouse(x, y);

        auto posX = x;
        auto posY = y;
        auto frameIdx = -1;