newt 0.6.4

Rust bindings for the Newt console UI library
Documentation 
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//
// Copyright (C) 2019 Robert Gill <locke@sdf.org>
//
// This file is a part of newt-rs.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License version 2.1 as published by the Free Software Foundation.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//

use libc::c_void;
use std::cell::Cell;
use std::mem::size_of;

use newt_sys::*;
use crate::component::Component;
use crate::intern::{asm,Parent};
use crate::widgets::Button;

///
/// Creates a row of buttons.
///
#[derive(Grid)]
pub struct ButtonBar {
    grid: Cell<newtGrid>,
    added_to_parent: Cell<bool>,
    children: Vec<Button>
}

impl ButtonBar {
    ///
    /// Create a new grid containing a row of buttons. The buttons will
    /// be labeled with the strings provided in `buttons`.
    ///
    /// * `buttons` - A list of strings to use as button labels.
    ///
    pub fn new(buttons: &[&str]) -> ButtonBar {
        unsafe {
            let size = size_of::<newtComponent>() * (buttons.len());
            let buttons_buf = libc::malloc(size) as *mut newtComponent;
            libc::memset(buttons_buf as *mut c_void, 0, size);
            let grid = asm::button_bar_new(buttons, buttons_buf);

            let num_buttons = buttons.len();
            let mut buttons = Vec::new();
            let mut button_co = *buttons_buf.add(num_buttons - 1);
            buttons.push(Button::new_co(button_co));
            for i in (0..num_buttons - 1).rev() {
                button_co = *buttons_buf.add(i);
                buttons.push(Button::new_co(button_co));
            }
            libc::free(buttons_buf as *mut c_void);

            ButtonBar {
                grid: Cell::new(grid),
                added_to_parent: Cell::new(false),
                children: buttons
            }
        }
    }

    ///
    /// Return the array of buttons contained by the grid.
    ///
    pub fn buttons(&self) -> &[Button] {
        return self.children.as_slice();
    }
}

impl Parent for ButtonBar {
    fn children(&self) -> Vec<&dyn Component> {
        let mut vec: Vec<&dyn Component> = Vec::new();
        for child in self.children.iter() {
            vec.push(child);
        }
        vec
    }
}