Implement fullscreen

Program windows can choose to show as fullscreen or windowed.

2 files changed, 15 insertions, 1 deletions

diff --git a/src/window.rs b/src/window.rs
index 1949387..882d0b8 100644
--- a/src/window.rs
+++ b/src/window.rs
@@ -3,7 +3,7 @@ use crate::*;
 use buffer::HasDimensions;
 use winit::dpi::{Size, PhysicalSize};
 use winit::event_loop::EventLoopWindowTarget;
-use winit::window::WindowId;
+use winit::window::{Fullscreen, WindowId};
 
 pub struct Window {
     pub controller: Box<dyn WindowController>,
@@ -86,6 +86,19 @@ impl Window {
     /// alter any buffer sizes or struct fields. When the window size eventually
     /// changes, the state updates are handled by `resize_buffer_and_surface`.
     pub fn update_window_size(&mut self) {
+        let fullscreen = self.controller.fullscreen();
+        if fullscreen != self.window.fullscreen().is_some() {
+            if fullscreen {
+                if let Some(monitor) = self.window.current_monitor() {
+                    if let Some(mode) = monitor.video_modes().nth(0) {
+                        self.window.set_fullscreen(Some(Fullscreen::Exclusive(mode)));
+                    }
+                };
+            } else {
+                self.window.set_fullscreen(None);
+            }
+        }
+
         let pixel_scale = self.controller.pixel_scale().get();
         if let Some(dimensions) = self.controller.exact_size() {
             // Without this early return, the constant re-setting of the window
diff --git a/src/window_controller.rs b/src/window_controller.rs
index c655d5d..fe23f53 100644
--- a/src/window_controller.rs
+++ b/src/window_controller.rs
@@ -10,6 +10,7 @@ pub trait WindowController {
     fn minimum_size(&self) -> Option<Dimensions> { None }
     fn maximum_size(&self) -> Option<Dimensions> { None }
     fn exact_size(&self) -> Option<Dimensions> { None }
+    fn fullscreen(&self) -> bool { false }
     fn pixel_scale(&self) -> NonZeroU32 { NON_ZERO_ONE }
 
     fn cursor_icon(&mut self) -> Option<CursorIcon> { None }