First display!

src/bin/main.rs

@@ -102,7 +102,7 @@ fn main() -> Result<()> {
     // TODO: [Threads, Panic] Make this close all the child threads too!
     panic::set_hook(Box::new(|info| panic_hook(info)));
 
-    tuice::launch_with_application(app, receiver);
+    tuice::launch_with_application(app, receiver, &mut terminal)?; // FIXME: Move terminal construction INSIDE
 
     // I think doing it in this order is safe...
     *thread_termination_lock.lock().unwrap() = true;

src/tuice/application.rs

@@ -1,5 +1,7 @@
 use std::{fmt::Debug, sync::mpsc::Receiver};
 
+use tui::Terminal;
+
 use super::{
     runtime::{self, RuntimeEvent},
     Element, Event,
@@ -32,9 +34,13 @@ pub trait Application: Sized {
     fn global_event_handler(&mut self, event: Event, messages: &mut Vec<Self::Message>) {}
 }
 
-/// Launches some application with tuice.
-pub fn launch_with_application<A: Application + 'static>(
-    application: A, receiver: Receiver<RuntimeEvent<A::Message>>,
-) {
-    runtime::launch(application, receiver);
+/// Launches some application with tuice. Note this will take over the calling thread.
+pub fn launch_with_application<A, B>(
+    application: A, receiver: Receiver<RuntimeEvent<A::Message>>, terminal: &mut Terminal<B>,
+) -> anyhow::Result<()>
+where
+    A: Application + 'static,
+    B: tui::backend::Backend,
+{
+    runtime::launch(application, receiver, terminal)
 }

src/tuice/component/base/flex.rs

@@ -49,7 +49,7 @@ impl<'a, Message> FlexElement<'a, Message> {
     }
 
     pub(crate) fn layout(&self, bounds: Bounds, node: &mut LayoutNode) -> Size {
-        todo!()
+        self.element.layout(bounds, node)
     }
 }
 

src/tuice/context.rs

@@ -8,7 +8,13 @@ pub struct DrawContext<'a> {
 }
 
 impl<'a> DrawContext<'_> {
-    pub(crate) fn new() {}
+    /// Creates a new [`DrawContext`], with the offset set to `(0, 0)`.
+    pub(crate) fn root(root: &'a LayoutNode) -> DrawContext<'a> {
+        DrawContext {
+            current_node: root,
+            current_offset: (0, 0),
+        }
+    }
 
     pub(crate) fn rect(&self) -> Rect {
         self.current_node.rect

src/tuice/layout/build_layout.rs

@@ -2,13 +2,13 @@ use tui::layout::Rect;
 
 use crate::tuice::{Bounds, Element, LayoutNode, TmpComponent};
 
-pub fn build_layout_tree<Message>(area: Rect, root: &Element<'_, Message>) -> LayoutNode {
-    let mut root_layout_node = LayoutNode::from_rect(area);
+pub fn build_layout_tree<Message>(rect: Rect, root: &Element<'_, Message>) -> LayoutNode {
+    let mut root_layout_node = LayoutNode::from_rect(rect);
     let bounds = Bounds {
         min_width: 0,
         min_height: 0,
-        max_width: area.width,
-        max_height: area.height,
+        max_width: rect.width,
+        max_height: rect.height,
     };
 
     let _ = root.layout(bounds, &mut root_layout_node);

src/tuice/runtime.rs

@@ -1,10 +1,10 @@
 use std::sync::mpsc::Receiver;
 
-use tui::layout::Rect;
+use tui::{backend::Backend, layout::Rect, Terminal};
 
 use crate::tuice::Status;
 
-use super::{Application, Event, TmpComponent};
+use super::{build_layout_tree, Application, Element, Event, TmpComponent};
 
 #[derive(Clone, Copy, Debug)]
 pub enum RuntimeEvent<Message> {
@@ -13,10 +13,15 @@ pub enum RuntimeEvent<Message> {
     Custom(Message),
 }
 
-pub(crate) fn launch<A: Application + 'static>(
-    mut application: A, receiver: Receiver<RuntimeEvent<A::Message>>,
-) {
+pub(crate) fn launch<A, B>(
+    mut application: A, receiver: Receiver<RuntimeEvent<A::Message>>, terminal: &mut Terminal<B>,
+) -> anyhow::Result<()>
+where
+    A: Application + 'static,
+    B: Backend,
+{
     let mut user_interface = application.view();
+    draw(&mut user_interface, terminal)?;
 
     while !application.is_terminated() {
         if let Ok(event) = receiver.recv() {
@@ -38,7 +43,7 @@ pub(crate) fn launch<A: Application + 'static>(
                     }
 
                     user_interface = application.view();
-                    // FIXME: Draw!
+                    draw(&mut user_interface, terminal)?;
                 }
                 RuntimeEvent::Custom(message) => {
                     application.update(message);
@@ -48,6 +53,8 @@ pub(crate) fn launch<A: Application + 'static>(
                     height: _,
                 } => {
                     user_interface = application.view();
+                    // FIXME: Also nuke any cache and the like...
+                    draw(&mut user_interface, terminal)?;
                 }
             }
         } else {
@@ -56,4 +63,21 @@ pub(crate) fn launch<A: Application + 'static>(
     }
 
     application.destroy();
+
+    Ok(())
+}
+
+fn draw<M, B>(user_interface: &mut Element<'_, M>, terminal: &mut Terminal<B>) -> anyhow::Result<()>
+where
+    B: Backend,
+{
+    terminal.draw(|frame| {
+        let rect = frame.size();
+        let layout = build_layout_tree(rect, &user_interface);
+        let context = super::DrawContext::root(&layout);
+
+        user_interface.draw(context, frame);
+    })?;
+
+    Ok(())
 }