Fix critical macOS crash and add icon size configuration

crates/drag/src/lib.rs

@@ -163,6 +163,10 @@ unsafe impl objc::Encode for DragMode {
 pub struct Options {
     pub skip_animatation_on_cancel_or_failure: bool,
     pub mode: DragMode,
+    /// Optional icon size (width, height) in pixels.
+    /// If set, the drag preview icon will be scaled to this size.
+    /// If None, the original image size will be used.
+    pub icon_size: Option<(u32, u32)>,
 }
 
 /// An image definition.

crates/drag/src/platform_impl/macos/mod.rs

@@ -67,7 +67,8 @@ pub fn start_drag<W: HasWindowHandle, F: Fn(DragResult, CursorPosition) + Send +
             let ns_view: id = msg_send![window, contentView];
 
             let mouse_location: NSPoint = msg_send![window, mouseLocationOutsideOfEventStream];
-            let current_position: NSPoint = msg_send![ns_view, backingAlignedRect: NSRect::new(mouse_location, NSSize::new(0., 0.)) options: NSAlignmentOptions::NSAlignAllEdgesOutward];
+            let rect: NSRect = msg_send![ns_view, backingAlignedRect: NSRect::new(mouse_location, NSSize::new(0., 0.)) options: NSAlignmentOptions::NSAlignAllEdgesOutward];
+            let current_position = rect.origin;
 
             let img: id = msg_send![class!(NSImage), alloc];
             let img: id = match image {
@@ -86,7 +87,15 @@ pub fn start_drag<W: HasWindowHandle, F: Fn(DragResult, CursorPosition) + Send +
                     NSImage::initWithData_(NSImage::alloc(nil), data)
                 }
             };
-            let image_size: NSSize = img.size();
+
+            // Apply icon size if specified in options
+            let image_size: NSSize = if let Some((width, height)) = options.icon_size {
+                let new_size = NSSize::new(width as f64, height as f64);
+                let _: () = msg_send![img, setSize: new_size];
+                new_size
+            } else {
+                img.size()
+            };
             let image_rect = NSRect::new(
                 NSPoint::new(
                     current_position.x - image_size.width / 2.,
@@ -261,15 +270,15 @@ pub fn start_drag<W: HasWindowHandle, F: Fn(DragResult, CursorPosition) + Send +
 
                             let callback_closure =
                                 &*(*callback as *mut Box<dyn Fn(DragResult, CursorPosition)>);
-                                
+
                             if operation == 0 {
                                 // NSDragOperationNone
                                 callback_closure(DragResult::Cancel, mouse_location);
                             } else {
                                 callback_closure(DragResult::Dropped, mouse_location);
                             }
 
-                            drop(Box::from_raw(*callback as *mut Box<dyn Fn(DragResult)>));
+                            drop(Box::from_raw(*callback as *mut Box<dyn Fn(DragResult, CursorPosition)>));
                         }
                     }
 

crates/drag/src/platform_impl/windows/mod.rs

@@ -239,7 +239,7 @@ pub fn start_drag<W: HasWindowHandle, F: Fn(DragResult, CursorPosition) + Send +
                 let drop_source: IDropSource = DropSource::new().into();
 
                 unsafe {
-                    if let Some(drag_image) = get_drag_image(image) {
+                    if let Some(drag_image) = get_drag_image(image, options.icon_size) {
                         if let Ok(helper) =
                             create_instance::<IDragSourceHelper>(&CLSID_DragDropHelper)
                         {
@@ -280,7 +280,7 @@ pub fn start_drag<W: HasWindowHandle, F: Fn(DragResult, CursorPosition) + Send +
                 let drop_source: IDropSource = DummyDropSource::new().into();
 
                 unsafe {
-                    if let Some(drag_image) = get_drag_image(image) {
+                    if let Some(drag_image) = get_drag_image(image, options.icon_size) {
                         if let Ok(helper) =
                             create_instance::<IDragSourceHelper>(&CLSID_DragDropHelper)
                         {
@@ -312,15 +312,18 @@ pub fn start_drag<W: HasWindowHandle, F: Fn(DragResult, CursorPosition) + Send +
     }
 }
 
-fn get_drag_image(image: Image) -> Option<SHDRAGIMAGE> {
+fn get_drag_image(image: Image, icon_size: Option<(u32, u32)>) -> Option<SHDRAGIMAGE> {
     let hbitmap = match image {
         Image::Raw(bytes) => image::read_bytes_to_hbitmap(&bytes).ok(),
         Image::File(path) => image::read_path_to_hbitmap(&path).ok(),
     };
     hbitmap.map(|hbitmap| unsafe {
         // get image size
         let mut bitmap: BITMAP = BITMAP::default();
-        let (width, height) = if 0
+        let (width, height) = if let Some((w, h)) = icon_size {
+            // Use specified icon size
+            (w as i32, h as i32)
+        } else if 0
             == GetObjectW(
                 hbitmap,
                 std::mem::size_of::<BITMAP>() as i32,