From be3c02104600e5bba8e3af7bc9787e62cba30183 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bla=C5=BE=20Hrastnik?= <blaz@mxxn.io>
Date: Mon, 7 Dec 2020 15:18:37 +0900
Subject: [PATCH] snapshot

---
 helix-term/src/application.rs | 14 ++++++++------
 helix-term/src/compositor.rs  | 10 +++++++++-
 2 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/helix-term/src/application.rs b/helix-term/src/application.rs
index 30258c1d5..506735e8e 100644
--- a/helix-term/src/application.rs
+++ b/helix-term/src/application.rs
@@ -8,7 +8,7 @@ use helix_view::{
     Document, Editor, Theme, View,
 };
 
-use crate::compositor::{Component, Compositor};
+use crate::compositor::{Component, Compositor, EventResult};
 
 use log::{debug, info};
 
@@ -383,7 +383,7 @@ impl EditorView {
 }
 
 impl Component for EditorView {
-    fn handle_event(&mut self, event: Event, executor: &smol::Executor) -> bool {
+    fn handle_event(&mut self, event: Event, executor: &smol::Executor) -> EventResult {
         match event {
             Event::Resize(width, height) => {
                 // TODO: simplistic ensure cursor in view for now
@@ -392,6 +392,7 @@ impl Component for EditorView {
                     view.size = (width, height);
                     view.ensure_cursor_in_view()
                 };
+                EventResult::Consumed(None)
             }
             Event::Key(event) => {
                 // if there's a prompt, it takes priority
@@ -400,6 +401,7 @@ impl Component for EditorView {
                         .as_mut()
                         .unwrap()
                         .handle_input(event, &mut self.editor);
+                    EventResult::Consumed(None)
                 } else if let Some(view) = self.editor.view_mut() {
                     let keys = vec![event];
                     // TODO: sequences (`gg`)
@@ -511,12 +513,13 @@ impl Component for EditorView {
                             }
                         }
                     }
+                    EventResult::Consumed(None)
+                } else {
+                    EventResult::Ignored
                 }
             }
-            Event::Mouse(_) => (),
+            Event::Mouse(_) => EventResult::Ignored,
         }
-
-        true
     }
     fn render(&mut self, renderer: &mut Renderer) {
         const OFFSET: u16 = 7; // 1 diagnostic + 5 linenr + 1 gutter
@@ -569,7 +572,6 @@ impl<'a> Application<'a> {
     }
 
     fn render(&mut self) {
-        // v2:
         self.renderer.surface.reset(); // reset is faster than allocating new empty surface
         self.compositor.render(&mut self.renderer); // viewport,
         self.renderer.draw_and_swap();
diff --git a/helix-term/src/compositor.rs b/helix-term/src/compositor.rs
index 187c56926..f859f9479 100644
--- a/helix-term/src/compositor.rs
+++ b/helix-term/src/compositor.rs
@@ -18,9 +18,17 @@ use crossterm::event::Event;
 use smol::Executor;
 use tui::buffer::Buffer as Surface;
 
+pub(crate) type Callback = Box<dyn Fn(&mut Compositor)>;
+
+// Cursive-inspired
+pub(crate) enum EventResult {
+    Ignored,
+    Consumed(Option<Callback>),
+}
+
 pub(crate) trait Component {
     /// Process input events, return true if handled.
-    fn handle_event(&mut self, event: Event, executor: &Executor) -> bool;
+    fn handle_event(&mut self, event: Event, executor: &Executor) -> EventResult;
     // , args: ()
 
     /// Should redraw? Useful for saving redraw cycles if we know component didn't change.