Add navigation through Ocelot component log history

src/main/scala/ocelot/desktop/ui/widget/LogWidget.scala

@@ -222,12 +222,16 @@ object LogWidget {
 
   sealed trait LogEntry
 
+  sealed trait TextLogEntry extends LogEntry {
+    val message: String
+  }
+
   object LogEntry {
 
     /** A message received from a log source. */
-    case class Rx(message: String) extends LogEntry
+    case class Rx(message: String) extends TextLogEntry
 
     /** A message sent to a log source. */
-    case class Tx(message: String) extends LogEntry
+    case class Tx(message: String) extends TextLogEntry
   }
 }

src/main/scala/ocelot/desktop/ui/widget/TextInput.scala

@@ -34,7 +34,7 @@ class TextInput(val initialText: String = "") extends Widget with MouseHandler w
   private val prevCursorPosition = Register.sampling(cursor.position)
 
   // view
-  private var isFocused = false
+  protected var isFocused = false
   private var scroll = 0f
   private var blinkTimer = 0f
   private var cursorOffset = 0f

src/main/scala/ocelot/desktop/util/OcelotInterfaceLogStorage.scala

@@ -2,7 +2,7 @@ package ocelot.desktop.util
 
 import ocelot.desktop.entity.traits.OcelotInterface
 import ocelot.desktop.ui.event.{BrainEvent, EventAware}
-import ocelot.desktop.ui.widget.LogWidget.LogEntry
+import ocelot.desktop.ui.widget.LogWidget.{LogEntry, TextLogEntry}
 import ocelot.desktop.ui.widget.window.Windowed
 import ocelot.desktop.util.OcelotInterfaceLogStorage._
 import ocelot.desktop.windows.OcelotInterfaceWindow
@@ -121,6 +121,16 @@ trait OcelotInterfaceLogStorage extends EventAware with Persistable with Windowe
     window.onMessagesRemoved(count)
   }
 
+  def getEntry(index: Int): LogEntry = _entries(index)
+
+  def findFirstTextEntry(exclude: String, start: Int): Int = {
+    _entries.indexWhere(it => it.isInstanceOf[TextLogEntry] && it.asInstanceOf[TextLogEntry].message != exclude, start)
+  }
+
+  def findLastTextEntry(exclude: String, end: Int): Int = {
+    _entries.lastIndexWhere(it => it.isInstanceOf[TextLogEntry] && it.asInstanceOf[TextLogEntry].message != exclude, end)
+  }
+
   private def addEntry(entry: LogEntry): Unit = {
     ensureFreeSpace(1)
     _entries += entry

src/main/scala/ocelot/desktop/windows/OcelotInterfaceWindow.scala

@@ -1,11 +1,13 @@
 package ocelot.desktop.windows
 
 import ocelot.desktop.geometry.{Padding2D, Size2D}
+import ocelot.desktop.ui.event.KeyEvent
 import ocelot.desktop.ui.layout.{AlignItems, Layout, LinearLayout}
-import ocelot.desktop.ui.widget.LogWidget.LogEntry
+import ocelot.desktop.ui.widget.LogWidget.{LogEntry, TextLogEntry}
 import ocelot.desktop.ui.widget.window.PanelWindow
 import ocelot.desktop.ui.widget.{Button, Checkbox, Filler, Label, LogWidget, PaddingBox, TextInput, Widget}
 import ocelot.desktop.util.{OcelotInterfaceLogStorage, Orientation}
+import org.lwjgl.input.Keyboard
 
 class OcelotInterfaceWindow(storage: OcelotInterfaceLogStorage) extends PanelWindow {
   override protected def title: String = s"${storage.name} ${storage.ocelotInterface.node.address}"
@@ -21,10 +23,36 @@ class OcelotInterfaceWindow(storage: OcelotInterfaceLogStorage) extends PanelWin
 
     children :+= logWidget
 
+    var historyPosition = 0
+    var unfinishedEntryBackup: Option[String] = None
+
     children :+= new TextInput() {
+      eventHandlers += {
+        case event @ KeyEvent(KeyEvent.State.Press | KeyEvent.State.Repeat, Keyboard.KEY_UP | Keyboard.KEY_DOWN, _) if this.isFocused =>
+          val currentInput = text
+          val index = if (event.code == Keyboard.KEY_UP) {
+            storage.findLastTextEntry(currentInput, storage.entryCount - historyPosition)
+          } else {
+            storage.findFirstTextEntry(currentInput, storage.entryCount - historyPosition + 1)
+          }
+          if (index != -1) {
+            if (unfinishedEntryBackup.isEmpty) {
+              unfinishedEntryBackup = Some(currentInput)
+            }
+            historyPosition = storage.entryCount - index
+            text = storage.getEntry(index).asInstanceOf[TextLogEntry].message
+            event.consume()
+          } else if (event.code == Keyboard.KEY_DOWN && unfinishedEntryBackup.nonEmpty) {
+            text = unfinishedEntryBackup.get
+            unfinishedEntryBackup = None
+          }
+      }
+
       override def onConfirm(): Unit = {
         pushLine(text)
         text = ""
+        unfinishedEntryBackup = None
+        historyPosition = 0
       }
     }
 
@@ -75,7 +103,11 @@ class OcelotInterfaceWindow(storage: OcelotInterfaceLogStorage) extends PanelWin
 
       children :+= new Button {
         override def text: String = "Clear"
-        override def onClick(): Unit = clear()
+        override def onClick(): Unit = {
+          unfinishedEntryBackup = None
+          historyPosition = 0
+          clear()
+        }
       }
     }
   })