[Editor] Create basic undo/redo system

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/command/model/Command.kt

@@ -0,0 +1,5 @@
+package com.bartlomiejpluta.base.editor.command.model
+
+interface Command {
+    fun execute()
+}

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/command/model/SimpleCommand.kt

@@ -0,0 +1,21 @@
+package com.bartlomiejpluta.base.editor.command.model
+
+class SimpleCommand<T>(
+    override val commandName: String,
+    private val formerValue: T,
+    private val value: T,
+    private val execute: (T) -> Unit
+) : Undoable, Command {
+
+    override fun undo() {
+        execute(formerValue)
+    }
+
+    override fun redo() {
+        execute()
+    }
+
+    override fun execute() {
+        execute(value)
+    }
+}

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/command/model/Undoable.kt

@@ -0,0 +1,7 @@
+package com.bartlomiejpluta.base.editor.command.model
+
+interface Undoable {
+    fun undo()
+    fun redo()
+    val commandName: String
+}

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/command/service/DefaultUndoRedoService.kt

@@ -0,0 +1,61 @@
+package com.bartlomiejpluta.base.editor.command.service
+
+import com.bartlomiejpluta.base.editor.command.model.Undoable
+import org.springframework.stereotype.Service
+import java.util.*
+
+@Service
+class DefaultUndoRedoService : UndoRedoService {
+    private val undo: Deque<Undoable> = ArrayDeque()
+    private val redo: Deque<Undoable> = ArrayDeque()
+
+    override var sizeMax = 30
+        set(value) {
+            if(value >= 0) {
+                for(i in 0 until undo.size - value) {
+                    undo.removeLast()
+                }
+
+                field = value
+            }
+        }
+
+    override fun push(undoable: Undoable) {
+        if(undo.size == sizeMax) {
+            undo.removeLast()
+        }
+
+        undo.push(undoable)
+        redo.clear()
+    }
+
+    override fun undo() {
+        if(undo.isNotEmpty()) {
+            undo.pop().let {
+                it.undo()
+                redo.push(it)
+            }
+        }
+    }
+
+    override fun redo() {
+        if(redo.isNotEmpty()) {
+            redo.pop().let {
+                it.redo()
+                undo.push(it)
+            }
+        }
+    }
+
+    override val lastUndoable: Undoable?
+        get() = undo.last
+
+    override val lastRedoable: Undoable?
+        get() = redo.last
+
+    override val undoCommandName: String
+        get() = undo.last?.commandName ?: ""
+
+    override val redoCommandName: String
+        get() = redo.last?.commandName ?: ""
+}

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/command/service/UndoRedoService.kt

@@ -0,0 +1,15 @@
+package com.bartlomiejpluta.base.editor.command.service
+
+import com.bartlomiejpluta.base.editor.command.model.Undoable
+
+interface UndoRedoService {
+    fun push(undoable: Undoable)
+    fun undo()
+    fun redo()
+
+    val lastUndoable: Undoable?
+    val lastRedoable: Undoable?
+    val undoCommandName: String
+    val redoCommandName: String
+    var sizeMax: Int
+}