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//! A box for getting a line of text input.
//!
//! To create a prompt widget, make a `PromptBuilder`, optionally modify
//! properties, and then use its `create` method to create a `Prompt` object.
use std::ptr;
use crate::bindings;
use crate::core::Screen;
use crate::util;
pub struct Prompt {
ptr: *mut bindings::Promptwidget,
}
pub struct PromptBuilder<'a, 'b> {
_screen: &'a Screen<'b>,
lefttop: (u32, u32),
width: u32,
title: Option<&'a str>,
}
impl<'a, 'b> PromptBuilder<'a, 'b> {
pub fn new(screen: &'a Screen<'b>, lefttop: (u32, u32), width: u32) -> Self {
PromptBuilder {
_screen: screen,
lefttop, width,
title: None,
}
}
pub fn add_title<'s: 'a>(&mut self, title: &'s str)
-> &mut Self {
self.title = Some(title);
self
}
pub fn create(&self) -> Prompt {
Prompt {
ptr: unsafe {
bindings::prw_make(
self.lefttop.0 as i32, self.lefttop.1 as i32,
self.width as i32,
match self.title {
None => ptr::null(),
Some(s) => s.as_ptr() as *const i8,
})
}
}
}
}
impl Prompt {
/// Called automatically; should only be needed if something else overwrote
/// the widget.
pub fn redraw(&self) {
unsafe { bindings::prw_redraw(self.ptr); }
}
/// Input string if <enter>, None otherwise.
///
/// The key should be a return value from `Keyboard::get_key()`.
pub fn handle_key(&mut self, key: i32) -> Option<String> {
let ptr = unsafe { bindings::prw_handlekey(self.ptr, key) };
if ptr.is_null() {
None
} else {
unsafe { Some(util::string_from_utf8_charp(ptr)) }
}
}
pub fn change_title(&mut self, title: &str) {
unsafe { bindings::prw_changetitle(self.ptr, title.as_ptr() as *const i8); }
}
}
impl Drop for Prompt {
fn drop(&mut self) {
unsafe { bindings::prw_destroy(self.ptr); }
}
}
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