Vendor dependencies for 0.3.0 release

vendor/bevy/examples/input/mouse_grab.rs

@@ -0,0 +1,28 @@
+//! Demonstrates how to grab and hide the mouse cursor.
+
+use bevy::{prelude::*, window::CursorGrabMode};
+
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins)
+        .add_systems(Update, grab_mouse)
+        .run();
+}
+
+// This system grabs the mouse when the left mouse button is pressed
+// and releases it when the escape key is pressed
+fn grab_mouse(
+    mut window: Single<&mut Window>,
+    mouse: Res<ButtonInput<MouseButton>>,
+    key: Res<ButtonInput<KeyCode>>,
+) {
+    if mouse.just_pressed(MouseButton::Left) {
+        window.cursor_options.visible = false;
+        window.cursor_options.grab_mode = CursorGrabMode::Locked;
+    }
+
+    if key.just_pressed(KeyCode::Escape) {
+        window.cursor_options.visible = true;
+        window.cursor_options.grab_mode = CursorGrabMode::None;
+    }
+}