Back button now acts like the "close" button, returning you to the upper-level screen (usually the world screen)

core/src/com/unciv/UnCivGame.kt

@@ -6,6 +6,7 @@ import com.badlogic.gdx.utils.Json
 import com.unciv.logic.GameInfo
 import com.unciv.logic.GameSaver
 import com.unciv.models.gamebasics.GameBasics
+import com.unciv.ui.utils.ImageGetter
 import com.unciv.ui.worldscreen.WorldScreen
 
 class UnCivGame : Game() {
@@ -24,6 +25,7 @@ class UnCivGame : Game() {
 
     override fun create() {
         Current = this
+        Gdx.input.isCatchBackKey=true
         GameBasics.run {  } // just to initialize
         settings = GameSaver().getGeneralSettings()
         if (GameSaver().getSave("Autosave").exists()) {
@@ -64,6 +66,12 @@ class UnCivGame : Game() {
         Gdx.input.inputProcessor = worldScreen.stage
     }
 
+    override fun resume() {
+        ImageGetter.refreshAltas()
+        worldScreen = WorldScreen()
+        setWorldScreen()
+    }
+
 
     companion object {
         lateinit var Current: UnCivGame

core/src/com/unciv/ui/EmpireOverviewScreen.kt

@@ -16,6 +16,7 @@ class EmpireOverviewScreen : CameraStageBaseScreen(){
 
     val civInfo = UnCivGame.Current.gameInfo.getPlayerCivilization()
     init {
+        onBackButtonClicked { UnCivGame.Current.setWorldScreen(); dispose() }
         val topTable = Table().apply { defaults().pad(10f) }
         val centerTable=Table().apply {  defaults().pad(20f) }
 

core/src/com/unciv/ui/cityscreen/CityScreen.kt

@@ -6,6 +6,7 @@ import com.badlogic.gdx.scenes.scene2d.InputEvent
 import com.badlogic.gdx.scenes.scene2d.ui.*
 import com.badlogic.gdx.scenes.scene2d.utils.ActorGestureListener
 import com.badlogic.gdx.utils.Align
+import com.unciv.UnCivGame
 import com.unciv.logic.HexMath
 import com.unciv.logic.city.CityInfo
 import com.unciv.logic.map.TileInfo
@@ -25,6 +26,7 @@ class CityScreen(internal val city: CityInfo) : CameraStageBaseScreen() {
     private var tileGroups = ArrayList<CityTileGroup>()
 
     init {
+        onBackButtonClicked { UnCivGame.Current.setWorldScreen(); dispose() }
         addTiles()
         stage.addActor(tileTable)
 

core/src/com/unciv/ui/pickerscreens/ConstructionPickerScreen.kt

@@ -33,6 +33,10 @@ class ConstructionPickerScreen(val city: CityInfo) : PickerScreen() {
             game.screen = CityScreen(this@ConstructionPickerScreen.city)
             dispose()
         }
+        onBackButtonClicked {
+            game.screen = CityScreen(this@ConstructionPickerScreen.city)
+            dispose()
+        }
 
         rightSideButton.setText("Pick construction".tr())
         rightSideButton.addClickListener {

core/src/com/unciv/ui/pickerscreens/PickerScreen.kt

@@ -16,7 +16,6 @@ open class PickerScreen : CameraStageBaseScreen() {
     internal var splitPane: SplitPane
 
     init {
-
         closeButton.addClickListener {
                 game.setWorldScreen()
                 dispose()

core/src/com/unciv/ui/pickerscreens/PolicyPickerScreen.kt

@@ -4,6 +4,7 @@ import com.badlogic.gdx.graphics.Color
 import com.badlogic.gdx.scenes.scene2d.ui.Button
 import com.badlogic.gdx.scenes.scene2d.ui.Table
 import com.badlogic.gdx.scenes.scene2d.ui.TextButton
+import com.unciv.UnCivGame
 import com.unciv.logic.civilization.CivilizationInfo
 import com.unciv.models.gamebasics.GameBasics
 import com.unciv.models.gamebasics.Policy
@@ -15,16 +16,6 @@ class PolicyPickerScreen(internal val civInfo: CivilizationInfo) : PickerScreen(
     private var pickedPolicy: Policy? = null
 
     init {
-
-
-        // Proof-of-concept for font generation
-//        val generator = FreeTypeFontGenerator(Gdx.files.internal("skin/Esteban-Regular.ttf"))
-//        val parameter = FreeTypeFontParameter()
-//        parameter.size = 25
-//        val font12 = generator.generateFont(parameter) // font size 12 pixels
-//        generator.dispose() // don't forget to dispose to avoid memory leaks!
-//        rightSideButton.style.font = font12
-
         val policies = civInfo.policies
         displayTutorials("PolicyPickerScreen")
 
@@ -34,6 +25,7 @@ class PolicyPickerScreen(internal val civInfo: CivilizationInfo) : PickerScreen(
             rightSideButton.setText("Adopt free policy")
             closeButton.disable()
         }
+        else onBackButtonClicked { UnCivGame.Current.setWorldScreen(); dispose() }
 
         rightSideButton.addClickListener {
             civInfo.policies.adopt(pickedPolicy!!)

core/src/com/unciv/ui/pickerscreens/PromotionPickerScreen.kt

@@ -4,6 +4,7 @@ import com.badlogic.gdx.graphics.Color
 import com.badlogic.gdx.scenes.scene2d.ui.Button
 import com.badlogic.gdx.scenes.scene2d.ui.Label
 import com.badlogic.gdx.scenes.scene2d.ui.VerticalGroup
+import com.unciv.UnCivGame
 import com.unciv.logic.map.MapUnit
 import com.unciv.models.gamebasics.GameBasics
 import com.unciv.models.gamebasics.unit.Promotion
@@ -14,6 +15,7 @@ class PromotionPickerScreen(mapUnit: MapUnit) : PickerScreen() {
 
 
     init {
+        onBackButtonClicked { UnCivGame.Current.setWorldScreen(); dispose() }
         rightSideButton.setText("Pick promotion")
         rightSideButton.addClickListener {
             mapUnit.promotions.addPromotion(selectedPromotion!!.name)

core/src/com/unciv/ui/pickerscreens/TechPickerScreen.kt

@@ -3,6 +3,7 @@ package com.unciv.ui.pickerscreens
 import com.badlogic.gdx.graphics.Color
 import com.badlogic.gdx.scenes.scene2d.ui.Label
 import com.badlogic.gdx.scenes.scene2d.ui.TextButton
+import com.unciv.UnCivGame
 import com.unciv.logic.civilization.CivilizationInfo
 import com.unciv.logic.civilization.TechManager
 import com.unciv.models.gamebasics.GameBasics
@@ -32,6 +33,8 @@ class TechPickerScreen(internal val civInfo: CivilizationInfo) : PickerScreen()
     }
 
     init {
+        onBackButtonClicked { UnCivGame.Current.setWorldScreen(); dispose() }
+
         techsToResearch = ArrayList(civTech.techsToResearch)
 
         val columns = 17

core/src/com/unciv/ui/utils/CameraStageBaseScreen.kt

@@ -1,6 +1,7 @@
 package com.unciv.ui.utils
 
 import com.badlogic.gdx.Gdx
+import com.badlogic.gdx.Input
 import com.badlogic.gdx.Screen
 import com.badlogic.gdx.graphics.Color
 import com.badlogic.gdx.graphics.GL20
@@ -9,10 +10,7 @@ import com.badlogic.gdx.graphics.g2d.Batch
 import com.badlogic.gdx.graphics.g2d.BitmapFont
 import com.badlogic.gdx.graphics.g2d.SpriteBatch
 import com.badlogic.gdx.graphics.g2d.freetype.FreeTypeFontGenerator
-import com.badlogic.gdx.scenes.scene2d.Actor
+import com.badlogic.gdx.scenes.scene2d.*
-import com.badlogic.gdx.scenes.scene2d.InputEvent
-import com.badlogic.gdx.scenes.scene2d.Stage
-import com.badlogic.gdx.scenes.scene2d.Touchable
 import com.badlogic.gdx.scenes.scene2d.ui.*
 import com.badlogic.gdx.scenes.scene2d.utils.ClickListener
 import com.badlogic.gdx.utils.Align
@@ -114,6 +112,8 @@ open class CameraStageBaseScreen : Screen {
         stage.addActor(tutorialTable)
     }
 
+
+
     companion object {
         var skin = Skin(Gdx.files.internal("skin/flat-earth-ui.json"))
                 .apply {
@@ -126,6 +126,18 @@ open class CameraStageBaseScreen : Screen {
         internal var batch: Batch = SpriteBatch()
     }
 
+    fun onBackButtonClicked(action:()->Unit){
+        stage.addListener(object : InputListener(){
+            override fun keyDown(event: InputEvent?, keycode: Int): Boolean {
+                if(keycode == Input.Keys.BACK){
+                    action()
+                    return true
+                }
+                return false
+            }
+        })
+    }
+
 }
 
 

core/src/com/unciv/ui/utils/ImageGetter.kt

@@ -3,7 +3,6 @@ package com.unciv.ui.utils
 import com.badlogic.gdx.graphics.Color
 import com.badlogic.gdx.graphics.g2d.TextureAtlas
 import com.badlogic.gdx.graphics.g2d.TextureRegion
-import com.badlogic.gdx.scenes.scene2d.Group
 import com.badlogic.gdx.scenes.scene2d.ui.Image
 import com.badlogic.gdx.scenes.scene2d.utils.Drawable
 import com.badlogic.gdx.scenes.scene2d.utils.TextureRegionDrawable
@@ -16,7 +15,7 @@ object ImageGetter {
     // always have to switch between like 170 different textures.
     // So, we now use TexturePacker in the DesktopLauncher class to pack all the different images into single images,
     // and the atlas is what tells us what was packed where.
-    val atlas = TextureAtlas("game.atlas")
+    var atlas = TextureAtlas("game.atlas")
 
     init{
     }
@@ -43,27 +42,12 @@ object ImageGetter {
             return getTextureRegion(WhiteDot)
         }
     }
-    class IconGroup(statName:String): Group() {
-        init{
-            val circleSize = 20f
-            val statSize = 17f
-            setSize(circleSize ,circleSize)
-//            addActor(ImageGetter.getImage("OtherIcons/Circle")
-//                    .apply { setSize(circleSize,circleSize )} )
-            val iconImage = ImageGetter.getImage("StatIcons/20x" + statName + "5.png")
-                    .apply { setSize(statSize,statSize); center(this@IconGroup)}
-            if(statName=="Population") iconImage.color= Color.GREEN.cpy().lerp(Color.BLACK,0.5f)
-            addActor(iconImage)
-        }
-    }
 
     fun getStatIcon(statName: String): Image {
         return ImageGetter.getImage("StatIcons/20x" + statName + "5.png")
                 .apply { setSize(20f,20f)}
-//        return IconGroup(name)
     }
 
-
     fun getUnitIcon(unitName:String):Image{
         return getImage("UnitIcons/$unitName.png")
     }
@@ -81,4 +65,8 @@ object ImageGetter {
     fun getBackground(color:Color): Drawable {
         return getDrawable(WhiteDot).tint(color)
     }
+
+    fun refreshAltas() {
+        atlas = TextureAtlas("game.atlas")
+    }
 }

core/src/com/unciv/ui/worldscreen/WorldScreen.kt

@@ -235,8 +235,5 @@ class WorldScreen : CameraStageBaseScreen() {
         super.render(delta)
     }
 
-//    override fun resume() {
-//        resize(Gdx.graphics.width,Gdx.graphics.height)
-//    }
 }