Merge pull request Catrobat#3692 from Rawbat/CATROID-569

CATROID-569 REFACTOR DeleteItemOfUserListAction to Kotlin

Author: christophsiegl

catroid/src/main/java/org/catrobat/catroid/content/actions/DeleteItemOfUserListAction.java

@@ -0,0 +1,51 @@
+/*
+ * Catroid: An on-device visual programming system for Android devices
+ * Copyright (C) 2010-2018 The Catrobat Team
+ * (<http://developer.catrobat.org/credits>)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * An additional term exception under section 7 of the GNU Affero
+ * General Public License, version 3, is available at
+ * http://developer.catrobat.org/license_additional_term
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.catrobat.catroid.content.actions
+
+import android.util.Log
+import com.badlogic.gdx.scenes.scene2d.actions.TemporalAction
+import org.catrobat.catroid.content.Sprite
+import org.catrobat.catroid.formulaeditor.Formula
+import org.catrobat.catroid.formulaeditor.InterpretationException
+import org.catrobat.catroid.formulaeditor.UserList
+
+class DeleteItemOfUserListAction : TemporalAction() {
+    var sprite: Sprite? = null
+    var formulaIndexToDelete: Formula? = null
+    var userList: UserList? = null
+
+    override fun update(percent: Float) {
+        val listSize = userList?.value?.size.takeUnless { it == 0 } ?: return
+
+        val indexToDelete = try {
+            formulaIndexToDelete?.interpretInteger(sprite)?.minus(1) ?: 0
+        } catch (exception: InterpretationException) {
+            Log.e(javaClass.simpleName, "Interpreting formula as integer failed", exception)
+            0
+        }
+
+        if (indexToDelete in 0 until listSize) {
+            userList!!.value.removeAt(indexToDelete)
+        }
+    }
+}