Add simple tooltip placement example

Cargo.toml

@@ -32,6 +32,9 @@ bevy_ui = { version = "0.15.0-rc.3", default-features = false, features = [
 bevy_window = { version = "0.15.0-rc.3", default-features = false }
 tiny_bail = "0.4"
 
+[dev-dependencies]
+bevy = "0.15.0-rc.3"
+
 [lints.rust]
 missing_docs = "deny"
 

examples/placement.rs

@@ -0,0 +1,71 @@
+//! A demonstration of some tooltip placement options.
+
+use bevy::prelude::*;
+use bevy::sprite::Anchor;
+use bevy::ui::Val::*;
+use pyri_tooltip::prelude::*;
+
+fn main() {
+    let mut app = App::new();
+    app.add_plugins((DefaultPlugins, TooltipPlugin::default()));
+    app.add_systems(Startup, spawn_scene);
+    app.add_systems(Update, highlight_hovered_tile);
+    app.run();
+}
+
+fn spawn_scene(mut commands: Commands) {
+    commands.spawn(Camera2d::default());
+    commands
+        .spawn(Node {
+            display: Display::Grid,
+            align_self: AlignSelf::Center,
+            justify_self: JustifySelf::Center,
+            row_gap: Px(8.0),
+            column_gap: Px(8.0),
+            grid_template_columns: RepeatedGridTrack::auto(3),
+            ..default()
+        })
+        .with_children(|parent| {
+            let tile = (
+                Node {
+                    width: Px(64.0),
+                    height: Px(64.0),
+                    border: UiRect::all(Px(4.0)),
+                    ..default()
+                },
+                BackgroundColor(Color::WHITE),
+                BorderColor(Color::BLACK),
+                BorderRadius::all(Px(8.0)),
+            );
+
+            // Demonstrate fixed placement.
+            for anchor in [
+                Anchor::TopLeft,
+                Anchor::TopCenter,
+                Anchor::TopRight,
+                Anchor::CenterLeft,
+                Anchor::Center,
+                Anchor::CenterRight,
+                Anchor::BottomLeft,
+                Anchor::BottomCenter,
+                Anchor::BottomRight,
+            ] {
+                parent.spawn((
+                    tile.clone(),
+                    Tooltip::fixed(anchor, format!("Tooltip::fixed({:?}, text)", anchor)),
+                ));
+            }
+
+            // Demonstrate cursor placement.
+            parent.spawn((tile.clone(), Tooltip::cursor("Tooltip::cursor(text)")));
+        });
+}
+
+fn highlight_hovered_tile(mut tile_query: Query<(&Interaction, &mut BackgroundColor)>) {
+    for (interaction, mut background_color) in &mut tile_query {
+        background_color.0 = match interaction {
+            Interaction::None => Color::NONE,
+            _ => Color::WHITE,
+        }
+    }
+}