auto-hide log messages

src/hud.rs

@@ -2,10 +2,12 @@ use crate::{settings, actor};
 use bevy::prelude::*;
 use bevy::diagnostic::{DiagnosticsStore, FrameTimeDiagnosticsPlugin};
 use std::collections::VecDeque;
+use std::time::SystemTime;
 
 const HUD_REFRESH_TIME: f32 = 0.5;
 const FONT: &str = "tmp/fonts/NotoSansSC-Thin.ttf";
 const LOG_MAX: usize = 5;
+const LOG_MAX_TIME_S: u64 = 3;
 
 pub struct HudPlugin;
 impl Plugin for HudPlugin {
@@ -24,9 +26,14 @@ struct GaugesText;
 #[derive(Resource)]
 struct FPSUpdateTimer(Timer);
 
+struct Message {
+    text: String,
+    time: u64,
+}
+
 #[derive(Resource)]
 struct Log {
-    logs: VecDeque<String>,
+    logs: VecDeque<Message>,
 }
 
 impl Log {
@@ -34,7 +41,22 @@ impl Log {
         if self.logs.len() == LOG_MAX {
             self.logs.pop_front();
         }
-        self.logs.push_back(message);
+        if let Ok(epoch) = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH) {
+            self.logs.push_back(Message {
+                text: message,
+                time: epoch.as_secs(),
+            });
+        }
+    }
+
+    pub fn remove_old(&mut self) {
+        if let Some(message) = self.logs.front() {
+            if let Ok(epoch) = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH) {
+                if epoch.as_secs() - message.time > LOG_MAX_TIME_S {
+                    self.logs.pop_front();
+                }
+            }
+        }
     }
 }
 
@@ -156,7 +178,7 @@ fn setup(
 fn update(
     diagnostics: Res<DiagnosticsStore>,
     time: Res<Time>,
-    log: Res<Log>,
+    mut log: ResMut<Log>,
     player: Query<(&actor::Suit, &actor::LifeForm), With<actor::Player>>,
     mut timer: ResMut<FPSUpdateTimer>,
     mut query: Query<&mut Text, With<GaugesText>>,
@@ -182,9 +204,10 @@ fn update(
             }
         }
         for mut text in &mut query {
-            let logs_vec: Vec<&str> = log.logs.iter().map(|s| s.as_str()).collect();
+            let logs_vec: Vec<&str> = log.logs.iter().map(|s| s.text.as_str()).collect();
             text.sections[9].value = logs_vec.join("\n");
         }
+        log.remove_old();
     }
 }