feat: LaunchConfig::with_visible (#935)

* feat: `LaunchConfig::with_visible`

* fix: Typo

crates/renderer/src/config.rs

@@ -38,6 +38,8 @@ pub struct WindowConfig {
     pub transparent: bool,
     /// Background color of the Window.
     pub background: Color,
+    /// Window visibility. Default to `true`.
+    pub visible: bool,
     /// The Icon of the Window.
     pub icon: Option<Icon>,
     /// Setup callback.
@@ -58,6 +60,7 @@ impl Default for WindowConfig {
             title: "Freya app",
             transparent: false,
             background: Color::WHITE,
+            visible: true,
             icon: None,
             on_setup: None,
             on_exit: None,
@@ -159,6 +162,12 @@ impl<'a, T: Clone> LaunchConfig<'a, T> {
         self
     }
 
+    /// Specify the Window visibility at launch.
+    pub fn with_visible(mut self, visible: bool) -> Self {
+        self.window_config.visible = visible;
+        self
+    }
+
     /// Embed a font.
     pub fn with_font(mut self, font_name: &'a str, font: &'a [u8]) -> Self {
         self.embedded_fonts.push((font_name, font));

crates/renderer/src/window_state.rs

@@ -75,6 +75,7 @@ impl<'a, State: Clone + 'a> WindowState<'a, State> {
         };
 
         let mut window_attributes = Window::default_attributes()
+            .with_visible(false)
             .with_title(config.window_config.title)
             .with_decorations(config.window_config.decorations)
             .with_transparent(config.window_config.transparent)
@@ -100,6 +101,10 @@ impl<'a, State: Clone + 'a> WindowState<'a, State> {
         let (graphics_driver, window, mut surface) =
             GraphicsDriver::new(event_loop, window_attributes, &config);
 
+        if config.window_config.visible {
+            window.set_visible(true);
+        }
+
         // Allow IME
         window.set_ime_allowed(true);