Small corrections and refactoring

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

@@ -7,9 +7,9 @@ import ocelot.desktop.graphics.{Font, Graphics}
 import ocelot.desktop.ui.UiHandler
 import ocelot.desktop.ui.event.handlers.MouseHandler
 import ocelot.desktop.ui.event.sources.KeyEvents
-import ocelot.desktop.ui.event.{ClickEvent, KeyEvent, MouseEvent}
+import ocelot.desktop.ui.event.{KeyEvent, MouseEvent}
 import ocelot.desktop.ui.widget.traits.HoverAnimation
-import ocelot.desktop.util.DrawUtils
+import ocelot.desktop.util.{DrawUtils, Register}
 import ocelot.desktop.util.animation.ColorAnimation
 import org.lwjgl.input.Keyboard
 
@@ -32,7 +32,8 @@ class TextInput(val initialText: String = "") extends Widget with MouseHandler w
   private var isFocused = false
   private var scroll = 0f
   private var blinkTimer = 0f
-  private var prevEnabled = enabled
+
+  private val enabledRegister = Register.sampling(enabled)
 
   private val foregroundAnimation = new ColorAnimation(targetForegroundColor, 7f)
   private val borderAnimation = new ColorAnimation(targetBorderColor, 7f)
@@ -81,22 +82,22 @@ class TextInput(val initialText: String = "") extends Widget with MouseHandler w
   // -------------------------------------------------------------------------------------------------------------------
   override def minimumSize: Size2D = Size2D(200, 24)
   override def maximumSize: Size2D = Size2D(Float.PositiveInfinity, 24)
-
-  override protected def receiveClickEvents: Boolean = true
-  override protected def receiveDragEvents: Boolean = true
-  override protected def allowClickReleaseOutsideThreshold: Boolean = false
   override def receiveAllMouseEvents = true
 
-  protected def font(): Font = Font.NormalFont
+  protected def font: Font = Font.NormalFont
 
-  private def charWidth(c: Char): Int = font().charWidth(c)
+  private def charWidth(c: Char): Int = font.charWidth(c)
 
-  private def charsWidth(chars: Array[Char]): Int = charsWidth(chars, 0, chars.length - 1)
-
-  private def charsWidth(chars: Array[Char], first: Int, last: Int): Int = {
+  /**
+    * Calculates given text width in pixels.
+    * @param from inclusive
+    * @param to   exclusive
+    */
+  //noinspection SameParameterValue
+  private def charsWidth(chars: Array[Char], from: Int, to: Int): Int = {
     var width = 0
-    for (index <- (first max 0) to (last min (chars.length - 1))) {
-      width += font().charWidth(chars(index))
+    for (index <- (from max 0) until (to min chars.length)) {
+      width += font.charWidth(chars(index))
     }
     width
   }
@@ -107,9 +108,9 @@ class TextInput(val initialText: String = "") extends Widget with MouseHandler w
         unfocus()
       }
 
-    case ClickEvent(MouseEvent.Button.Left, mouse) if enabled =>
+    case MouseEvent(MouseEvent.State.Pressed, MouseEvent.Button.Left) if enabled =>
       focus()
-      val absoluteX = mouse.x - bounds.x + scroll - 4
+      val absoluteX = UiHandler.mousePosition.x - bounds.x + scroll - 4
       var width = 0
       var pos = 0
       while (width < absoluteX && pos < chars.length) {
@@ -195,7 +196,7 @@ class TextInput(val initialText: String = "") extends Widget with MouseHandler w
 
   private def adjustCursor(position: Int): Unit = {
     cursorPos = position
-    cursorOffset = charsWidth(chars, 0, cursorPos - 1)
+    cursorOffset = charsWidth(chars, 0, cursorPos)
     blinkTimer = 0
     adjustScroll()
   }
@@ -210,22 +211,20 @@ class TextInput(val initialText: String = "") extends Widget with MouseHandler w
   override def update(): Unit = {
     super.update()
 
+    // process state changes
     if (textChanged) {
       onInput(text)
       updateAnimationTargets()
       textChanged = false
     }
-
-    val nextEnabled = enabled
-    if (nextEnabled != prevEnabled) {
+    if (enabledRegister.update()) {
       updateAnimationTargets()
-      prevEnabled = nextEnabled
     }
-
     if (isFocused && !enabled) {
       unfocus()
     }
 
+    // update everything
     foregroundAnimation.update()
     borderAnimation.update()
     blinkTimer = (blinkTimer + UiHandler.dt) % CursorBlinkTime

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

@@ -1,7 +1,5 @@
 package ocelot.desktop.util
 
-import ocelot.desktop.ui.widget.Updatable
-
 /**
   * Stores a value updated by calls to [[update]].
   */