From cdab8f90fb525c509e0a15bb1d0b3d7213e176f3 Mon Sep 17 00:00:00 2001
From: Cory Forsstrom <cforsstrom18@gmail.com>
Date: Thu, 8 Apr 2021 12:58:08 -0700
Subject: [PATCH] add window visibility

---
 src/application.rs             | 11 +++++++++++
 winit/src/application.rs       |  8 ++++++++
 winit/src/application/state.rs | 12 ++++++++++++
 winit/src/settings.rs          |  4 +++-
 4 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/src/application.rs b/src/application.rs
index 7b7de6d4..317f9801 100644
--- a/src/application.rs
+++ b/src/application.rs
@@ -191,6 +191,13 @@ pub trait Application: Sized {
         false
     }
 
+    /// Returns whether the [`Application`] should be visible or not
+    ///
+    /// By default, it returns `true`.
+    fn visible(&self) -> bool {
+        true
+    }
+
     /// Runs the [`Application`].
     ///
     /// On native platforms, this method will take control of the current thread
@@ -295,6 +302,10 @@ where
     fn should_exit(&self) -> bool {
         self.0.should_exit()
     }
+
+    fn visible(&self) -> bool {
+        self.0.visible()
+    }
 }
 
 #[cfg(target_arch = "wasm32")]
diff --git a/winit/src/application.rs b/winit/src/application.rs
index 106d5218..e73f3df1 100644
--- a/winit/src/application.rs
+++ b/winit/src/application.rs
@@ -98,6 +98,13 @@ pub trait Application: Program<Clipboard = Clipboard> {
     fn should_exit(&self) -> bool {
         false
     }
+
+    /// Returns whether the [`Application`] should be visible or not
+    ///
+    /// By default, it returns `true`.
+    fn visible(&self) -> bool {
+        true
+    }
 }
 
 /// Runs an [`Application`] with an executor, compositor, and the provided
@@ -145,6 +152,7 @@ where
         .into_builder(
             &application.title(),
             application.mode(),
+            application.visible(),
             event_loop.primary_monitor(),
         )
         .build(&event_loop)
diff --git a/winit/src/application/state.rs b/winit/src/application/state.rs
index 46297370..d157211a 100644
--- a/winit/src/application/state.rs
+++ b/winit/src/application/state.rs
@@ -12,6 +12,7 @@ pub struct State<A: Application> {
     mode: Mode,
     background_color: Color,
     scale_factor: f64,
+    visible: bool,
     viewport: Viewport,
     viewport_version: usize,
     cursor_position: winit::dpi::PhysicalPosition<f64>,
@@ -26,6 +27,7 @@ impl<A: Application> State<A> {
         let mode = application.mode();
         let background_color = application.background_color();
         let scale_factor = application.scale_factor();
+        let visible = application.visible();
 
         let viewport = {
             let physical_size = window.inner_size();
@@ -41,6 +43,7 @@ impl<A: Application> State<A> {
             mode,
             background_color,
             scale_factor,
+            visible,
             viewport,
             viewport_version: 0,
             // TODO: Encode cursor availability in the type-system
@@ -201,5 +204,14 @@ impl<A: Application> State<A> {
 
             self.scale_factor = new_scale_factor;
         }
+
+        // Update window visibility
+        let new_visible = application.visible();
+
+        if self.visible != new_visible {
+            window.set_visible(new_visible);
+
+            self.visible = new_visible;
+        }
     }
 }
diff --git a/winit/src/settings.rs b/winit/src/settings.rs
index 9ce5cfc5..56be1e07 100644
--- a/winit/src/settings.rs
+++ b/winit/src/settings.rs
@@ -66,6 +66,7 @@ impl Window {
         self,
         title: &str,
         mode: Mode,
+        visible: bool,
         primary_monitor: Option<MonitorHandle>,
     ) -> WindowBuilder {
         let mut window_builder = WindowBuilder::new();
@@ -80,7 +81,8 @@ impl Window {
             .with_transparent(self.transparent)
             .with_window_icon(self.icon)
             .with_always_on_top(self.always_on_top)
-            .with_fullscreen(conversion::fullscreen(primary_monitor, mode));
+            .with_fullscreen(conversion::fullscreen(primary_monitor, mode))
+            .with_visible(visible);
 
         if let Some((width, height)) = self.min_size {
             window_builder = window_builder