Add ConfirmableClickBehaviour

src/main/kotlin/graphics/scenery/controls/behaviours/ConfirmableClickBehaviour.kt

@@ -0,0 +1,33 @@
+package graphics.scenery.controls.behaviours
+
+import org.scijava.ui.behaviour.ClickBehaviour
+import kotlin.concurrent.thread
+
+/**
+ * [ClickBehaviour] that waits [timeout] for confirmation by re-executing the behaviour.
+ * Executes [armedAction] on first invocation, and [confirmAction] on second invocation, if
+ * it happens within [timeout].
+ *
+ * @author Ulrik Guenther <[email protected]>
+ */
+class ConfirmableClickBehaviour(val armedAction: (Long) -> Any, val confirmAction: (Long) -> Any, var timeout: Long = 3000): ClickBehaviour {
+    /** Whether the action is armed at the moment. Action becomes disarmed after [timeout]. */
+    private var armed: Boolean = false
+
+    /**
+     * Action fired at position [x]/[y]. Parameters not used in VR actions.
+     */
+    override fun click(x : Int, y : Int) {
+        if(!armed) {
+            armed = true
+            armedAction.invoke(timeout)
+
+            thread {
+                Thread.sleep(timeout)
+                armed = false
+            }
+        } else {
+            confirmAction.invoke(timeout)
+        }
+    }
+}