Allow selecting current word by double click

src/main/scala/ocelot/desktop/ui/event/DoubleClickEvent.scala

@@ -0,0 +1,5 @@
+package ocelot.desktop.ui.event
+
+import ocelot.desktop.geometry.Vector2D
+
+case class DoubleClickEvent(button: MouseEvent.Button.Value, mousePos: Vector2D) extends Event

src/main/scala/ocelot/desktop/ui/event/handlers/MouseHandler.scala

@@ -2,8 +2,8 @@ package ocelot.desktop.ui.event.handlers
 
 import ocelot.desktop.geometry.Vector2D
 import ocelot.desktop.ui.UiHandler
-import ocelot.desktop.ui.event.handlers.MouseHandler.Tolerance
-import ocelot.desktop.ui.event.{ClickEvent, DragEvent, MouseEvent}
+import ocelot.desktop.ui.event.handlers.MouseHandler.{DoubleClickTime, Tolerance}
+import ocelot.desktop.ui.event.{ClickEvent, DoubleClickEvent, DragEvent, MouseEvent}
 import ocelot.desktop.ui.widget.Widget
 
 import scala.collection.mutable
@@ -13,13 +13,18 @@ trait MouseHandler extends Widget {
   private val prevPositions = new mutable.HashMap[MouseEvent.Button.Value, Vector2D]()
   private val dragButtons = new mutable.HashSet[MouseEvent.Button.Value]()
 
+  private var lastClickPosition: Vector2D = Vector2D.Zero
+  private var lastClickTime: Long = 0
+  private var lastClickButton = MouseEvent.Button.Left
+
   override def receiveMouseEvents: Boolean = receiveClickEvents || receiveDragEvents
 
   protected def receiveClickEvents: Boolean = false
 
   protected def receiveDragEvents: Boolean = false
 
-  /** If `true`, a [[ClickEvent]] will be registered even if the mouse button is released
+  /**
+    * If `true`, a [[ClickEvent]] will be registered even if the mouse button is released
     * outside the tolerance threshold, as long as it stays within the widget's bounds.
     */
   protected def allowClickReleaseOutsideThreshold: Boolean = !receiveDragEvents
@@ -39,7 +44,7 @@ trait MouseHandler extends Widget {
             if (allowClickReleaseOutsideThreshold) {
               clippedBounds.contains(mousePos)
             } else {
-              (p - mousePos).lengthSquared < Tolerance * Tolerance
+              withinTolerance(p, mousePos)
             }
           })
       )
@@ -50,11 +55,23 @@ trait MouseHandler extends Widget {
 
       if (clicked) {
         handleEvent(ClickEvent(button, mousePos))
+
+        val inTimeForDoubleClick = (System.currentTimeMillis() - lastClickTime) < DoubleClickTime * 1000
+        val sameButton = lastClickButton == button
+        val roughlySamePosition = withinTolerance(lastClickPosition, mousePos)
+        if (inTimeForDoubleClick && sameButton && roughlySamePosition) {
+          handleEvent(DoubleClickEvent(button, mousePos))
+        }
+        lastClickTime = System.currentTimeMillis()
+        lastClickPosition = mousePos
+        lastClickButton = button
       }
 
       startPositions.remove(button)
   }
 
+  private def withinTolerance(a: Vector2D, b: Vector2D): Boolean = (b - a).lengthSquared < Tolerance * Tolerance
+
   override def update(): Unit = {
     super.update()
 
@@ -65,7 +82,7 @@ trait MouseHandler extends Widget {
     val mousePos = UiHandler.mousePosition
 
     for ((button, startPos) <- startPositions) {
-      if (!dragButtons.contains(button) && (startPos - mousePos).lengthSquared > Tolerance * Tolerance) {
+      if (!dragButtons.contains(button) && !withinTolerance(startPos, mousePos)) {
         handleEvent(DragEvent(DragEvent.State.Start, button, mousePos, startPos, Vector2D(0, 0)))
         dragButtons += button
         prevPositions += (button -> mousePos)
@@ -90,4 +107,5 @@ trait MouseHandler extends Widget {
 
 object MouseHandler {
   private val Tolerance = 8
+  private val DoubleClickTime = 0.2
 }

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

@@ -7,7 +7,7 @@ import ocelot.desktop.graphics.{Font, Graphics, IconSource}
 import ocelot.desktop.ui.UiHandler
 import ocelot.desktop.ui.event.handlers.MouseHandler
 import ocelot.desktop.ui.event.sources.KeyEvents
-import ocelot.desktop.ui.event.{DragEvent, KeyEvent, MouseEvent}
+import ocelot.desktop.ui.event.{DoubleClickEvent, DragEvent, KeyEvent, MouseEvent}
 import ocelot.desktop.ui.widget.TextInput.{Cursor, Selector, Text}
 import ocelot.desktop.ui.widget.contextmenu.{ContextMenu, ContextMenuEntry}
 import ocelot.desktop.ui.widget.traits.HoverAnimation
@@ -15,6 +15,8 @@ import ocelot.desktop.util.{DrawUtils, Register, Watcher}
 import ocelot.desktop.util.animation.ColorAnimation
 import org.lwjgl.input.Keyboard
 
+import java.lang.Character.isWhitespace
+
 
 class TextInput(val initialText: String = "") extends Widget with MouseHandler with HoverAnimation {
   private val CursorBlinkTime = 2f
@@ -98,8 +100,12 @@ 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 def receiveAllMouseEvents = true
   override def receiveDragEvents: Boolean = true
+  override def receiveClickEvents: Boolean = true
+
+  private def mouseInBounds: Boolean = clippedBounds.contains(UiHandler.mousePosition)
 
   protected def font: Font = Font.NormalFont
 
@@ -121,7 +127,7 @@ class TextInput(val initialText: String = "") extends Widget with MouseHandler w
 
   eventHandlers += {
     case MouseEvent(MouseEvent.State.Pressed, MouseEvent.Button.Left) if enabled =>
-      val inBounds = clippedBounds.contains(UiHandler.mousePosition)
+      val inBounds = mouseInBounds
       if (isFocused && !inBounds) unfocus()
       if (!isFocused && inBounds) focus()
       if (isFocused) {
@@ -132,8 +138,7 @@ class TextInput(val initialText: String = "") extends Widget with MouseHandler w
       }
 
     case MouseEvent(MouseEvent.State.Pressed, MouseEvent.Button.Right) if isFocused =>
-      val inBounds = clippedBounds.contains(UiHandler.mousePosition)
-      if (inBounds) {
+      if (mouseInBounds) {
         val menu = new ContextMenu
         if (selector.active) {
           menu.addEntry(ContextMenuEntry("Cut", IconSource.Icons.Cut) { cutSelection() })
@@ -149,6 +154,12 @@ class TextInput(val initialText: String = "") extends Widget with MouseHandler w
         root.get.contextMenus.open(menu)
       }
 
+    case event @ DoubleClickEvent(MouseEvent.Button.Left, _) if isFocused =>
+      if (mouseInBounds) {
+        selectWord()
+        event.consume()
+      }
+
     case event @ DragEvent(DragEvent.State.Start, MouseEvent.Button.Left, mouse) if isFocused =>
       val pos = pixelToCursorPosition(mouse.x - bounds.x)
       selector.active = true
@@ -238,6 +249,11 @@ class TextInput(val initialText: String = "") extends Widget with MouseHandler w
       selectAll()
       event.consume()
 
+    case event @ KeyEvent(KeyEvent.State.Press | KeyEvent.State.Repeat, Keyboard.KEY_W, _)
+        if isFocused && KeyEvents.isControlDown =>
+      selectWord()
+      event.consume()
+
     case event @ KeyEvent(KeyEvent.State.Press | KeyEvent.State.Repeat, Keyboard.KEY_C, _)
         if isFocused && KeyEvents.isControlDown && selector.active =>
       copySelection()
@@ -288,6 +304,13 @@ class TextInput(val initialText: String = "") extends Widget with MouseHandler w
     selector.to = _text.chars.length
   }
 
+  private def selectWord(): Unit = {
+    selector.active = true
+    selector.from = 0 max (_text.chars.lastIndexWhere(isWhitespace, cursor.position - 1) + 1)
+    val to = _text.chars.indexWhere(isWhitespace, cursor.position)
+    selector.to = if (to >= 0 && to < _text.chars.length) to else _text.chars.length
+  }
+
   private def copySelection(): Unit = {
     UiHandler.clipboard = selectedText
   }