feat(macos): add document edited apis, closes #268 (#287)

* Add API for MacOS NSWindow::isDocumentEdited()

This fixes #268 and therefore tauri-apps/tauri#3125

The setter API is added upstream in the cocoa crate
(servo/core-foundation-rs PR #493)

* use objc directly

* fmt

* cast to i8

* Update src/platform/macos.rs

.changes/macos-decoumen-edited.md

@@ -0,0 +1,5 @@
+---
+"tao": patch
+---
+
+Add `WindowExtMacOS::is_doucmented_edited` and `WindowExtMacOS::set_is_doucmented_edited` on macOS.

src/platform/macos.rs

@@ -55,6 +55,14 @@ pub trait WindowExtMacOS {
 
   /// Sets whether or not the window has shadow.
   fn set_has_shadow(&self, has_shadow: bool);
+
+  /// Put the window in a state which indicates a file save is required.
+  ///
+  /// <https://developer.apple.com/documentation/appkit/nswindow/1419311-isdocumentedited>
+  fn set_is_document_edited(&self, edited: bool);
+
+  /// Get the window's edit state
+  fn is_document_edited(&self) -> bool;
 }
 
 impl WindowExtMacOS for Window {
@@ -87,6 +95,16 @@ impl WindowExtMacOS for Window {
   fn set_has_shadow(&self, has_shadow: bool) {
     self.window.set_has_shadow(has_shadow)
   }
+
+  #[inline]
+  fn set_is_document_edited(&self, edited: bool) {
+    self.window.set_is_document_edited(edited)
+  }
+
+  #[inline]
+  fn is_document_edited(&self) -> bool {
+    self.window.is_document_edited()
+  }
 }
 
 /// Corresponds to `NSApplicationActivationPolicy`.

src/platform_impl/macos/window.rs

@@ -1379,6 +1379,19 @@ impl WindowExtMacOS for UnownedWindow {
         .setHasShadow_(if has_shadow { YES } else { NO })
     }
   }
+
+  #[inline]
+  fn set_is_document_edited(&self, edited: bool) {
+    unsafe { self.ns_window.setDocumentEdited_(edited as i8) }
+  }
+
+  #[inline]
+  fn is_document_edited(&self) -> bool {
+    unsafe {
+      let is_document_edited: BOOL = msg_send![*self.ns_window, isDocumentEdited];
+      is_document_edited == YES
+    }
+  }
 }
 
 impl Drop for UnownedWindow {