[orx-gui] Fix multi-window support. Add WindowedGUI

orx-jvm/orx-gui/src/main/kotlin/WindowedGUI.kt

@@ -0,0 +1,31 @@
+package org.openrndr.extra.gui
+
+import org.openrndr.Extension
+import org.openrndr.Program
+import org.openrndr.WindowConfiguration
+import org.openrndr.extra.parameters.title
+import org.openrndr.math.IntVector2
+import org.openrndr.panel.style.StyleSheet
+import org.openrndr.panel.style.defaultStyles
+import org.openrndr.window
+
+class WindowedGUI(val appearance: GUIAppearance = GUIAppearance(), val defaultStyles: List<StyleSheet> = defaultStyles()) : Extension {
+    override var enabled: Boolean = true
+
+    val addedObjects = mutableListOf<Pair<Any, String?>>()
+    fun <T : Any> add(objectWithParameters: T, label: String? = objectWithParameters.title()): T {
+        addedObjects.add(Pair(objectWithParameters, label))
+        return objectWithParameters
+    }
+
+
+    override fun setup(program: Program) {
+        program.window(WindowConfiguration(width = 200, height = program.height, position = program.window.position.toInt() - IntVector2(200,0) )) {
+            val gui = GUI(appearance, defaultStyles)
+            for ((obj, label) in addedObjects) {
+                gui.add(obj, label)
+            }
+            extend(gui)
+        }
+    }
+}