confirmation added for exit game and return to main menu

src/net/torvald/terrarum/ui/UIItem.kt

@@ -57,6 +57,8 @@ abstract class UIItem(var parentUI: UICanvas, val initialX: Int, val initialY: I
     abstract val width: Int
     abstract val height: Int
 
+    private val mouseButton = App.getConfigInt("config_mouseprimary")
+
     /** This variable is NOT updated on its own.
      * ```
      * val posXDelta = posX - oldPosX
@@ -88,9 +90,20 @@ abstract class UIItem(var parentUI: UICanvas, val initialX: Int, val initialY: I
         get() = relativeMouseX in 0..width - 1 && relativeMouseY in 0..height - 1
     /** If mouse is hovering over it and mouse is down */
     open val mousePushed: Boolean
-        get() = mouseUp && Gdx.input.isButtonPressed(App.getConfigInt("config_mouseprimary"))
+        get() = mouseUp && Gdx.input.isButtonPressed(mouseButton)
+    /** If mouse is just pushed */
+    open val mouseJustPushed: Boolean
+        get() {
+            if (mouseUp && !mouseLatched && Gdx.input.isButtonJustPressed(mouseButton)) {
+                mouseLatched = true
+                return true
+            }
+            return false
+        }
 
 
+    private var mouseLatched = false
+
     /** UI to call (show up) while mouse is up */
     open val mouseOverCall: UICanvas? = null
 
@@ -139,6 +152,8 @@ abstract class UIItem(var parentUI: UICanvas, val initialX: Int, val initialY: I
                 if (mouseOverCall?.isVisible ?: false) {
                     mouseOverCall?.setAsClose()
                 }
+
+                mouseLatched = false
             }
         }
     }

src/net/torvald/terrarum/ui/UIItemTextButtonList.kt

@@ -3,9 +3,11 @@ package net.torvald.terrarum.ui
 import com.badlogic.gdx.graphics.Camera
 import com.badlogic.gdx.graphics.Color
 import com.badlogic.gdx.graphics.g2d.SpriteBatch
-import net.torvald.terrarum.*
+import net.torvald.terrarum.BlendMode
+import net.torvald.terrarum.Second
+import net.torvald.terrarum.fillRect
+import net.torvald.terrarum.toInt
 import net.torvald.terrarumsansbitmap.gdx.TextureRegionPack
-import kotlin.math.roundToInt
 
 /**
  * Created by minjaesong on 2017-03-13.
@@ -186,7 +188,7 @@ class UIItemTextButtonList(
             btn.update(delta)
 
 
-            if (btn.mousePushed && index != selectedIndex) {
+            if (btn.mouseJustPushed && index != selectedIndex) {
                 val oldIndex = selectedIndex
 
                 if (kinematic) {