[drag-and-drop] Disable interactions with Tooltip layer

egui/src/containers/area.rs

@@ -53,10 +53,7 @@ impl Area {
     }
 
     pub fn layer(&self) -> LayerId {
-        LayerId {
-            order: self.order,
-            id: self.id,
-        }
+        LayerId::new(self.order, self.id)
     }
 
     /// moveable by dragging the area?

egui/src/context.rs

@@ -458,8 +458,8 @@ impl Context {
             .map(|id| self.memory().has_kb_focus(id))
             .unwrap_or(false);
 
-        if interaction_id.is_none() || sense == Sense::nothing() {
-            // Not interested in input:
+        if interaction_id.is_none() || sense == Sense::nothing() || !layer_id.allow_interaction() {
+            // Not interested or allowed input:
             return Response {
                 ctx: self.clone(),
                 sense,

egui/src/layers.rs

@@ -11,8 +11,10 @@ pub enum Order {
     /// Normal moveable windows that you reorder by click
     Middle,
     /// Popups, menus etc that should always be painted on top of windows
-    Foreground,
     /// Foreground objects can also have tooltips
+    Foreground,
+    /// Things floating on top of everything else, like tooltips.
+    /// You cannot interact with these.
     Tooltip,
     /// Debug layer, always painted last / on top
     Debug,
@@ -26,6 +28,13 @@ impl Order {
         Self::Tooltip,
         Self::Debug,
     ];
+
+    pub fn allow_interaction(&self) -> bool {
+        match self {
+            Self::Background | Self::Middle | Self::Foreground | Self::Debug => true,
+            Self::Tooltip => false,
+        }
+    }
 }
 
 /// An identifier for a paint layer.
@@ -38,6 +47,10 @@ pub struct LayerId {
 }
 
 impl LayerId {
+    pub fn new(order: Order, id: Id) -> Self {
+        Self { order, id }
+    }
+
     pub fn debug() -> Self {
         Self {
             order: Order::Debug,
@@ -51,6 +64,10 @@ impl LayerId {
             id: Id::background(),
         }
     }
+
+    pub fn allow_interaction(&self) -> bool {
+        self.order.allow_interaction()
+    }
 }
 
 /// A unique identifier of a specific `PaintCmd` in a `PaintList`.

egui/src/ui.rs

@@ -109,10 +109,7 @@ impl Ui {
         let mut ctx = Context::new();
         ctx.begin_frame(Default::default());
         let id = Id::new("__test");
-        let layer_id = LayerId {
-            order: Order::Middle,
-            id,
-        };
+        let layer_id = LayerId::new(Order::Middle, id);
         let rect = Rect::from_min_size(Pos2::new(0.0, 0.0), vec2(1000.0, 1000.0));
         Self::new(ctx, layer_id, id, rect, rect)
     }