turbo-vision 0.1.0

A Rust implementation of the classic Borland Turbo Vision text-mode UI framework
Documentation 
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use crate::core::geometry::Rect;
use crate::core::event::{Event, EventType, KB_ESC_ESC};
use crate::core::command::{CommandId, CM_CANCEL, CM_CLOSE};
use crate::terminal::Terminal;
use super::view::View;
use super::window::Window;
use std::time::Duration;

pub struct Dialog {
    window: Window,
    result: CommandId,
}

impl Dialog {
    pub fn new(bounds: Rect, title: &str) -> Self {
        Self {
            window: Window::new(bounds, title),
            result: CM_CANCEL,
        }
    }

    pub fn add(&mut self, view: Box<dyn View>) {
        self.window.add(view);
    }

    pub fn set_initial_focus(&mut self) {
        self.window.set_initial_focus();
    }

    /// Get the number of child views
    pub fn child_count(&self) -> usize {
        self.window.child_count()
    }

    /// Get a reference to a child view by index
    pub fn child_at(&self, index: usize) -> &dyn View {
        self.window.child_at(index)
    }

    /// Get a mutable reference to a child view by index
    pub fn child_at_mut(&mut self, index: usize) -> &mut dyn View {
        self.window.child_at_mut(index)
    }

    pub fn execute(&mut self, terminal: &mut Terminal) -> CommandId {
        self.result = CM_CANCEL;

        loop {
            // Draw
            self.draw(terminal);
            self.update_cursor(terminal);
            let _ = terminal.flush();

            // Get event
            if let Ok(Some(mut event)) = terminal.poll_event(Duration::from_millis(50)) {
                // Double ESC closes the dialog
                if event.what == EventType::Keyboard && event.key_code == KB_ESC_ESC {
                    self.result = CM_CANCEL;
                    break;
                }

                self.handle_event(&mut event);

                // Check if dialog should close
                if event.what == EventType::Command {
                    // CM_CLOSE from close button should be treated as CM_CANCEL
                    if event.command == CM_CLOSE {
                        self.result = CM_CANCEL;
                    } else {
                        self.result = event.command;
                    }
                    break;
                }
            }
        }

        self.result
    }
}

impl View for Dialog {
    fn bounds(&self) -> Rect {
        self.window.bounds()
    }

    fn set_bounds(&mut self, bounds: Rect) {
        self.window.set_bounds(bounds);
    }

    fn draw(&mut self, terminal: &mut Terminal) {
        self.window.draw(terminal);
    }

    fn update_cursor(&self, terminal: &mut Terminal) {
        self.window.update_cursor(terminal);
    }

    fn handle_event(&mut self, event: &mut Event) {
        self.window.handle_event(event);
    }
}