fltk-rs Align 文本对齐

   let mut main_win = window::DoubleWindow::default()
        .with_size(400, 300)
        .with_label("MainWin");
    let mut btn = button::Button::default()
        .with_size(300, 200)
        .center_of_parent()
        .with_label("FLTKRSFLTKRSFLTKRSFLTKRS");
    main_win.end();

btn.set_align(enums::Align::Left);

btn.set_align(enums::Align::Inside | enums::Align::Left);

    Bottom
    BottomLeft
    BottomRight
    Center
    Clip
    ImageBackdrop
    ImageMask
    ImageNextToText
    Inside
    Left
    LeftBottom
    LeftTop
    PositionMask
    Right
    RightBottom
    RightTop
    TextNextToImage
    TextOverImage
    Top
    TopLeft
    TopRight
    Wrap