Add methods WindowHandle::is_resizable etc

druid-shell/src/backend/gtk/window.rs

@@ -974,12 +974,30 @@ impl WindowHandle {
         }
     }
 
+    pub fn is_resizable(&self) -> bool {
+        self.state
+            .upgrade()
+            .map(true, |state| state.window.is_resizable())
+    }
+
+    pub fn is_transparent(&self) -> bool {
+        self.state
+            .upgrade()
+            .map_or(false, |state| state.is_transparent)
+    }
+
     pub fn show_titlebar(&self, show_titlebar: bool) {
         if let Some(state) = self.state.upgrade() {
             state.window.set_decorated(show_titlebar)
         }
     }
 
+    pub fn has_titlebar(&self) -> bool {
+        self.state
+            .upgrade()
+            .map(true, |state| state.window.is_decorated())
+    }
+
     pub fn set_position(&self, mut position: Point) {
         if let Some(state) = self.state.upgrade() {
             if let Some(parent_state) = &state.parent {

druid-shell/src/backend/mac/window.rs

@@ -1223,6 +1223,11 @@ impl WindowHandle {
     // TODO: Implement this
     pub fn show_titlebar(&self, _show_titlebar: bool) {}
 
+    pub fn has_titlebar(&self) -> bool {
+        tracing::warn!("WindowHandle::has_titlebar is currently unimplemented for Mac.");
+        true
+    }
+
     // Need to translate mac y coords, as they start from bottom left
     pub fn set_position(&self, mut position: Point) {
         // TODO: Maybe @cmyr can get this into a state where modal windows follow the parent?
@@ -1371,6 +1376,16 @@ impl WindowHandle {
         }
     }
 
+    pub fn is_resizable(&self) -> bool {
+        tracing::warn!("WindowHandle::is_resizable is currently unimplemented for Mac.");
+        true
+    }
+
+    pub fn is_transparent(&self) -> bool {
+        tracing::warn!("WindowHandle::is_transparent is currently unimplemented for Mac.");
+        false
+    }
+
     pub fn set_menu(&self, menu: Menu) {
         unsafe {
             NSApp().setMainMenu_(menu.menu);

druid-shell/src/backend/wayland/window.rs

@@ -106,10 +106,25 @@ impl WindowHandle {
         tracing::warn!("resizable is unimplemented on wayland");
     }
 
+    pub fn is_resizable(&self) -> bool {
+        tracing::warn!("is_resizable is unimplemented on wayland");
+        true
+    }
+
+    pub fn is_transparent(&self) -> bool {
+        tracing::warn!("is_transparent is unimplemented on wayland");
+        false
+    }
+
     pub fn show_titlebar(&self, _show_titlebar: bool) {
         tracing::warn!("show_titlebar is unimplemented on wayland");
     }
 
+    pub fn has_titlebar(&self) -> bool {
+        tracing::warn!("has_titlebar is unimplemented on wayland");
+        true
+    }
+
     pub fn set_position(&self, _position: Point) {
         tracing::warn!("set_position is unimplemented on wayland");
     }

druid-shell/src/backend/web/window.rs

@@ -377,14 +377,29 @@ impl WindowBuilder {
         // Ignored
     }
 
+    pub fn is_resizable(&self) -> bool {
+        warn!("is_resizable is unimplemented on web");
+        true
+    }
+
     pub fn show_titlebar(&mut self, _show_titlebar: bool) {
         // Ignored
     }
 
+    pub fn has_titlebar(&self) -> bool {
+        warn!("has_titlebar is unimplemented on web");
+        true
+    }
+
     pub fn set_transparent(&mut self, _transparent: bool) {
         // Ignored
     }
 
+    pub fn is_transparent(&self) -> bool {
+        warn!("is_transparent is unimplemented on web");
+        true
+    }
+
     pub fn set_position(&mut self, _position: Point) {
         // Ignored
     }

druid-shell/src/backend/windows/window.rs

@@ -1880,6 +1880,13 @@ impl WindowHandle {
         self.defer(DeferredOp::ShowTitlebar(show_titlebar));
     }
 
+    pub fn has_titlebar(&self) -> bool {
+        self.state
+            .upgrade()
+            .map(|state| state.has_titlebar.get())
+            .unwrap_or_default()
+    }
+
     pub fn set_position(&self, position: Point) {
         self.defer(DeferredOp::SetWindowState(window::WindowState::Restored));
         if let Some(w) = self.state.upgrade() {
@@ -1986,6 +1993,20 @@ impl WindowHandle {
         self.defer(DeferredOp::SetResizable(resizable));
     }
 
+    pub fn is_resizable(&self) -> bool {
+        self.state
+            .upgrade()
+            .map(|state| state.is_resizable.get())
+            .unwrap_or_default()
+    }
+
+    pub fn is_transparent(&self) -> bool {
+        self.state
+            .upgrade()
+            .map(|state| state.is_transparent.get())
+            .unwrap_or_default()
+    }
+
     // Sets the window state.
     pub fn set_window_state(&self, state: window::WindowState) {
         self.defer(DeferredOp::SetWindowState(state));

druid-shell/src/backend/x11/window.rs

@@ -1610,6 +1610,16 @@ impl WindowHandle {
         }
     }
 
+    pub fn is_resizable(&self) -> bool {
+        warn!("is_resizable is unimplemented on x11");
+        true
+    }
+
+    pub fn is_transparent(&self) -> bool {
+        warn!("is_transparent is unimplemented on x11");
+        false
+    }
+
     pub fn show_titlebar(&self, show_titlebar: bool) {
         if let Some(w) = self.window.upgrade() {
             w.show_titlebar(show_titlebar);
@@ -1618,6 +1628,11 @@ impl WindowHandle {
         }
     }
 
+    pub fn has_titlebar(&self) -> bool {
+        warn!("has_titlebar is unimplemented on x11");
+        true
+    }
+
     pub fn set_position(&self, position: Point) {
         if let Some(w) = self.window.upgrade() {
             w.set_position(position);

druid-shell/src/window.rs

@@ -191,6 +191,16 @@ impl WindowHandle {
         self.0.resizable(resizable)
     }
 
+    /// Get whether the window is resizable
+    pub fn is_resizable(&self) -> bool {
+        self.0.is_resizable()
+    }
+
+    /// Get whether the window is transparent
+    pub fn is_transparent(&self) -> bool {
+        self.0.is_transparent()
+    }
+
     /// Sets the state of the window.
     pub fn set_window_state(&mut self, state: WindowState) {
         self.0.set_window_state(state);
@@ -216,6 +226,11 @@ impl WindowHandle {
         self.0.show_titlebar(show_titlebar)
     }
 
+    /// Get whether the window has titlebar.
+    pub fn has_titlebar(&self) -> bool {
+        self.0.has_titlebar()
+    }
+
     /// Sets the position of the window.
     ///
     /// The position is given in [display points], measured relative to the parent window if there