On Web, fix setting cursor icon overriding cursor visibility (#3269)

CHANGELOG.md

@@ -26,6 +26,7 @@ Unreleased` header.
 - On X11, fix `Xft.dpi` detection from Xresources.
 - On Windows, fix consecutive calls to `window.set_fullscreen(Some(Fullscreen::Borderless(None)))` resulting in losing previous window state when eventually exiting fullscreen using `window.set_fullscreen(None)`.
 - On Web, remove queuing fullscreen request in absence of transient activation.
+- On Web, fix setting cursor icon overriding cursor visibility.
 
 # 0.29.4
 

src/platform_impl/web/cursor.rs

@@ -1,5 +1,5 @@
 use std::{
-    cell::RefCell,
+    cell::{Cell, RefCell},
     ops::Deref,
     rc::{Rc, Weak},
 };
@@ -44,6 +44,7 @@ impl WebCustomCursor {
         document: &Document,
         style: &Style,
         previous: SelectedCursor,
+        cursor_visible: Rc<Cell<bool>>,
     ) -> SelectedCursor {
         let previous = previous.into();
 
@@ -54,6 +55,7 @@ impl WebCustomCursor {
                 style.clone(),
                 image,
                 previous,
+                cursor_visible,
             )),
             WebCustomCursor::Url {
                 url,
@@ -61,7 +63,11 @@ impl WebCustomCursor {
                 hotspot_y,
             } => {
                 let value = previous.style_with_url(url, *hotspot_x, *hotspot_y);
-                style.set("cursor", &value);
+
+                if cursor_visible.get() {
+                    style.set("cursor", &value);
+                }
+
                 SelectedCursor::Url {
                     style: value,
                     previous,
@@ -200,6 +206,7 @@ impl From<SelectedCursor> for Previous {
 pub enum CursorImageState {
     Loading {
         style: Style,
+        cursor_visible: Rc<Cell<bool>>,
         previous: Previous,
         hotspot_x: u16,
         hotspot_y: u16,
@@ -219,6 +226,7 @@ impl CursorImageState {
         style: Style,
         image: &CursorImage,
         previous: Previous,
+        cursor_visible: Rc<Cell<bool>>,
     ) -> Rc<RefCell<Option<Self>>> {
         // Can't create array directly when backed by SharedArrayBuffer.
         // Adapted from https://github.com/rust-windowing/softbuffer/blob/ab7688e2ed2e2eca51b3c4e1863a5bd7fe85800e/src/web.rs#L196-L223
@@ -261,6 +269,7 @@ impl CursorImageState {
 
         let state = Rc::new(RefCell::new(Some(Self::Loading {
             style,
+            cursor_visible,
             previous,
             hotspot_x: image.hotspot_x,
             hotspot_y: image.hotspot_y,
@@ -305,7 +314,7 @@ impl CursorImageState {
                             };
                             let mut state = state.borrow_mut();
                             // Extract old state.
-                            let CursorImageState::Loading { style, previous, hotspot_x, hotspot_y, .. } = state.take().unwrap() else {
+                            let CursorImageState::Loading { style, cursor_visible, previous, hotspot_x, hotspot_y, .. } = state.take().unwrap() else {
                                 unreachable!("found invalid state")
                             };
 
@@ -316,7 +325,11 @@ impl CursorImageState {
                             let data_url = Url::create_object_url_with_blob(&blob).unwrap();
 
                             let value = previous.style_with_url(&data_url, hotspot_x, hotspot_y);
-                            style.set("cursor", &value);
+
+                            if cursor_visible.get() {
+                                style.set("cursor", &value);
+                            }
+
                             *state = Some(
                                 CursorImageState::Ready {
                                     style: value,

src/platform_impl/web/window.rs

@@ -13,7 +13,7 @@ use super::r#async::Dispatcher;
 use super::{backend, monitor::MonitorHandle, EventLoopWindowTarget, Fullscreen};
 use web_sys::HtmlCanvasElement;
 
-use std::cell::RefCell;
+use std::cell::{Cell, RefCell};
 use std::collections::VecDeque;
 use std::rc::Rc;
 
@@ -26,6 +26,7 @@ pub struct Inner {
     pub window: web_sys::Window,
     canvas: Rc<RefCell<backend::Canvas>>,
     selected_cursor: RefCell<SelectedCursor>,
+    cursor_visible: Rc<Cell<bool>>,
     destroy_fn: Option<Box<dyn FnOnce()>>,
 }
 
@@ -55,6 +56,7 @@ impl Window {
             window: window.clone(),
             canvas,
             selected_cursor: Default::default(),
+            cursor_visible: Rc::new(Cell::new(true)),
             destroy_fn: Some(destroy_fn),
         };
 
@@ -197,7 +199,10 @@ impl Inner {
     #[inline]
     pub fn set_cursor_icon(&self, cursor: CursorIcon) {
         *self.selected_cursor.borrow_mut() = SelectedCursor::Named(cursor);
-        self.canvas.borrow().style().set("cursor", cursor.name());
+
+        if self.cursor_visible.get() {
+            self.canvas.borrow().style().set("cursor", cursor.name());
+        }
     }
 
     #[inline]
@@ -208,6 +213,7 @@ impl Inner {
             canvas.document(),
             canvas.style(),
             self.selected_cursor.take(),
+            self.cursor_visible.clone(),
         );
         *self.selected_cursor.borrow_mut() = new_cursor;
     }
@@ -235,12 +241,14 @@ impl Inner {
 
     #[inline]
     pub fn set_cursor_visible(&self, visible: bool) {
-        if !visible {
+        if !visible && self.cursor_visible.get() {
             self.canvas.borrow().style().set("cursor", "none");
-        } else {
+            self.cursor_visible.set(false);
+        } else if visible && !self.cursor_visible.get() {
             self.selected_cursor
                 .borrow()
                 .set_style(self.canvas.borrow().style());
+            self.cursor_visible.set(true);
         }
     }