macos: support disabling the titlebar

This isn't fully baked yet, so I'm not documenting it yet.

config/src/lib.rs

@@ -636,6 +636,9 @@ pub struct Config {
     #[serde(default)]
     pub allow_square_glyphs_to_overflow_width: AllowSquareGlyphOverflow,
 
+    #[serde(default)]
+    pub window_decorations: WindowDecorations,
+
     /// When using FontKitXXX font systems, a set of directories to
     /// search ahead of the standard font locations for fonts.
     /// Relative paths are taken to be relative to the directory
@@ -1157,6 +1160,18 @@ pub struct LoadedConfig {
     lua: Option<mlua::Lua>,
 }
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+pub enum WindowDecorations {
+    Full,
+    None,
+}
+
+impl Default for WindowDecorations {
+    fn default() -> Self {
+        Self::Full
+    }
+}
+
 struct PathPossibility {
     path: PathBuf,
     is_required: bool,

wezterm-gui/src/window_config.rs

@@ -48,4 +48,13 @@ impl WindowConfiguration for ConfigBridge {
     fn window_background_opacity(&self) -> f32 {
         configuration().window_background_opacity
     }
+
+    fn decorations(&self) -> ::window::WindowDecorations {
+        use ::config::WindowDecorations as CWD;
+        use ::window::WindowDecorations as WD;
+        match configuration().window_decorations {
+            CWD::Full => WD::Full,
+            CWD::None => WD::None,
+        }
+    }
 }

window/src/configuration.rs

@@ -1,3 +1,4 @@
+use crate::WindowDecorations;
 use std::sync::{Arc, Mutex};
 
 pub trait WindowConfiguration {
@@ -44,6 +45,10 @@ pub trait WindowConfiguration {
     fn window_background_opacity(&self) -> f32 {
         1.0
     }
+
+    fn decorations(&self) -> WindowDecorations {
+        WindowDecorations::default()
+    }
 }
 
 lazy_static::lazy_static! {

window/src/lib.rs

@@ -78,6 +78,18 @@ pub enum MouseCursor {
     SizeLeftRight,
 }
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum WindowDecorations {
+    Full,
+    None,
+}
+
+impl Default for WindowDecorations {
+    fn default() -> Self {
+        Self::Full
+    }
+}
+
 #[allow(unused_variables)]
 pub trait WindowCallbacks: Any {
     /// Called when the window close button is clicked.

window/src/os/macos/window.rs

@@ -6,7 +6,7 @@ use crate::connection::ConnectionOps;
 use crate::{
     config, Clipboard, Connection, Dimensions, KeyCode, KeyEvent, Modifiers, MouseButtons,
     MouseCursor, MouseEvent, MouseEventKind, MousePress, Point, Rect, ScreenPoint, Size,
-    WindowCallbacks, WindowOps, WindowOpsMut,
+    WindowCallbacks, WindowDecorations, WindowOps, WindowOpsMut,
 };
 use anyhow::{anyhow, bail, ensure};
 use cocoa::appkit::{
@@ -358,10 +358,7 @@ impl Window {
         callbacks: Box<dyn WindowCallbacks>,
     ) -> anyhow::Result<Window> {
         unsafe {
-            let style_mask = NSWindowStyleMask::NSTitledWindowMask
-                | NSWindowStyleMask::NSClosableWindowMask
-                | NSWindowStyleMask::NSMiniaturizableWindowMask
-                | NSWindowStyleMask::NSResizableWindowMask;
+            let style_mask = decoration_to_mask(config().decorations());
             let rect = NSRect::new(
                 NSPoint::new(0., 0.),
                 NSSize::new(width as f64, height as f64),
@@ -618,6 +615,35 @@ fn screen_point_to_cartesian(point: ScreenPoint) -> NSPoint {
 }
 
 impl WindowInner {
+    fn is_fullscreen(&mut self) -> bool {
+        if self.is_native_fullscreen() {
+            true
+        } else if let Some(window_view) = WindowView::get_this(unsafe { &**self.view }) {
+            window_view.inner.borrow().fullscreen.is_some()
+        } else {
+            false
+        }
+    }
+
+    fn apply_decorations(&mut self) {
+        if !self.is_fullscreen() {
+            let mask = decoration_to_mask(config().decorations());
+            unsafe {
+                self.window.setStyleMask_(mask);
+                /*
+                NSWindow::setMovableByWindowBackground_(
+                    *self.window,
+                    if mask == NSWindowStyleMask::NSResizableWindowMask {
+                        YES
+                    } else {
+                        NO
+                    },
+                );
+                */
+            }
+        }
+    }
+
     fn toggle_native_fullscreen(&mut self) {
         unsafe {
             NSWindow::toggleFullScreen_(*self.window, nil);
@@ -663,13 +689,8 @@ impl WindowInner {
                 Some(saved_rect) => unsafe {
                     // Restore prior dimensions
                     self.window.orderOut_(nil);
-                    self.window.setStyleMask_(
-                        NSWindowStyleMask::NSTitledWindowMask
-                            | NSWindowStyleMask::NSClosableWindowMask
-                            | NSWindowStyleMask::NSMiniaturizableWindowMask
-                            | NSWindowStyleMask::NSResizableWindowMask,
-                    );
-
+                    self.window
+                        .setStyleMask_(decoration_to_mask(config().decorations()));
                     self.window.setFrame_display_(saved_rect, YES);
                     self.window.makeKeyAndOrderFront_(nil);
                     self.window.setOpaque_(NO);
@@ -833,6 +854,19 @@ impl WindowOpsMut for WindowInner {
 
     fn config_did_change(&mut self) {
         self.update_window_shadow();
+        self.apply_decorations();
+    }
+}
+
+fn decoration_to_mask(decorations: WindowDecorations) -> NSWindowStyleMask {
+    match decorations {
+        WindowDecorations::Full => {
+            NSWindowStyleMask::NSTitledWindowMask
+                | NSWindowStyleMask::NSClosableWindowMask
+                | NSWindowStyleMask::NSMiniaturizableWindowMask
+                | NSWindowStyleMask::NSResizableWindowMask
+        }
+        WindowDecorations::None => NSWindowStyleMask::NSResizableWindowMask,
     }
 }