Try to grab cursor

audulus · May 9, 2023 · 3ffbf67 · 3ffbf67
1 parent 673b4a6
commit 3ffbf67
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Showing 2 changed files with 16 additions and 6 deletions.
diff --git a/src/context.rs b/src/context.rs
@@ -114,6 +114,9 @@ pub struct Context {
 
     /// Lock the cursor in position. Useful for dragging knobs.
     pub(crate) grab_cursor: bool,
+
+    /// Value of grab_cursor before processing event.
+    pub(crate) prev_grab_cursor: bool,
 }
 
 impl Default for Context {
@@ -147,6 +150,7 @@ impl Context {
             render_dirty: false,
             access_node_classes: accesskit::NodeClassSet::default(),
             grab_cursor: false,
+            prev_grab_cursor: false,
         }
     }
 

diff --git a/src/winit_event_loop.rs b/src/winit_event_loop.rs
@@ -116,15 +116,21 @@ async fn setup(window: &Window) -> Setup {
 fn process_event(cx: &mut Context, view: &impl View, event: &Event, window: &Window) {
     cx.process(view, event);
 
-    if cx.grab_cursor {
-        //window.set_cursor_grab(winit::window::CursorGrabMode::Confined)
-        //    .or_else(|_e| window.set_cursor_grab(winit::window::CursorGrabMode::Locked))
-        //    .unwrap();
+    if cx.grab_cursor && !cx.prev_grab_cursor {
+        println!("grabbing cursor");
+        window.set_cursor_grab(winit::window::CursorGrabMode::Confined)
+           .or_else(|_e| window.set_cursor_grab(winit::window::CursorGrabMode::Locked))
+           .unwrap();
         window.set_cursor_visible(false);
-    } else {
-        // window.set_cursor_grab(winit::window::CursorGrabMode::None).unwrap();
+    }
+
+    if !cx.grab_cursor && cx.prev_grab_cursor {
+        println!("releasing cursor");
+        window.set_cursor_grab(winit::window::CursorGrabMode::None).unwrap();
         window.set_cursor_visible(true);
     }
+
+    cx.prev_grab_cursor = cx.grab_cursor;
 }
 
 /// Call this function to run your UI.