renderer: add support for floating-titlebars (#4)

Reviewed-on: https://git.kosslan.dev/wry/jay/pulls/4

jay-config/src/_private/client.rs

@@ -1057,6 +1057,16 @@ impl ConfigClient {
         show
     }
 
+    pub fn set_floating_titles(&self, floating: bool) {
+        self.send(&ClientMessage::SetFloatingTitles { floating });
+    }
+
+    pub fn get_floating_titles(&self) -> bool {
+        let res = self.send_with_response(&ClientMessage::GetFloatingTitles);
+        get_response!(res, false, GetFloatingTitles { floating });
+        floating
+    }
+
     pub fn set_bar_position(&self, position: BarPosition) {
         self.send(&ClientMessage::SetBarPosition { position });
     }

jay-config/src/_private/ipc.rs

@@ -812,6 +812,10 @@ pub enum ClientMessage<'a> {
         show: bool,
     },
     GetShowTitles,
+    SetFloatingTitles {
+        floating: bool,
+    },
+    GetFloatingTitles,
     GetWorkspaceConnector {
         workspace: Workspace,
     },
@@ -1114,6 +1118,9 @@ pub enum Response {
     GetShowTitles {
         show: bool,
     },
+    GetFloatingTitles {
+        floating: bool,
+    },
     GetWorkspaceConnector {
         connector: Connector,
     },

jay-config/src/lib.rs

@@ -361,6 +361,27 @@ pub fn toggle_show_titles() {
     get.set_show_titles(!get.get_show_titles());
 }
 
+/// Sets whether title bars float above window content instead of being attached.
+///
+/// When enabled, title bars are rendered on top of window content without consuming
+/// layout space. Window borders do not extend to include the title bar area.
+///
+/// The default is `false`.
+pub fn set_floating_titles(floating: bool) {
+    get!().set_floating_titles(floating)
+}
+
+/// Returns whether title bars float above window content.
+pub fn get_floating_titles() -> bool {
+    get!(false).get_floating_titles()
+}
+
+/// Toggles whether title bars float above window content.
+pub fn toggle_floating_titles() {
+    let get = get!();
+    get.set_floating_titles(!get.get_floating_titles());
+}
+
 /// Sets a callback to run when this config is unloaded.
 ///
 /// Only one callback can be set at a time. If another callback is already set, it will be

jay-config/src/theme.rs

@@ -370,5 +370,9 @@ pub mod sized {
         ///
         /// Default: 0
         const 05 => GAP,
+        /// The gap between the titlebar and the window content in pixels.
+        ///
+        /// Default: 0
+        const 06 => TITLE_GAP,
     }
 }