highlight the selected element, closes #9

client/src/main/kotlin/org/hso/texturesyncclient/model/GUIModel.kt

@@ -25,11 +25,18 @@ class GUIModel constructor(var data: Texture, img: Image) : VBox(){
     private val gmc =  find(GUIModelController::class)
 
     init {
-        //super.setPadding(Insets(10.0, 10.0, 10.0, 10.0))
+        super.setPadding(Insets(5.0, 5.0, 5.0, 5.0))
         super.getChildren().addAll(image, label)
         super.setOnContextMenuRequested { p0 -> contextMenu.show(this@GUIModel, p0.screenX, p0.screenY) }
         super.setOnMouseClicked{
-            //this.background = Background(BackgroundFill(Paint.valueOf("#42adaf"), CornerRadii.EMPTY, Insets.EMPTY))
+            if (gmc.isLastSelectedInitialized()) {
+                gmc.lastSelected.background = Background.EMPTY
+                this.background = Background(BackgroundFill(Paint.valueOf("#42adaf"), CornerRadii.EMPTY, Insets.EMPTY))
+                gmc.lastSelected = this
+            } else {
+                this.background = Background(BackgroundFill(Paint.valueOf("#42adaf"), CornerRadii.EMPTY, Insets.EMPTY))
+                gmc.lastSelected = this
+            }
             gmc.previewSelectedAction(data)
         }
 

client/src/main/kotlin/org/hso/texturesyncclient/model/GUIModelController.kt

@@ -7,6 +7,9 @@ class GUIModelController: Controller() {
 
     private val rootc = find(RootController::class)
 
+    lateinit var lastSelected: GUIModel
+    fun isLastSelectedInitialized() = ::lastSelected.isInitialized
+
     fun export(data: Texture) {
         rootc.exportTexture(data)
     }

client/src/main/kotlin/org/hso/texturesyncclient/view/mainView/FolderView.kt

@@ -10,9 +10,9 @@ import tornadofx.*
 class FolderView : View("FolderView"){
 
     override val root = flowpane {
-        hgap = 15.0
-        vgap = 15.0
-        paddingAll = 12.0
+        hgap = 5.0
+        vgap = 5.0
+        paddingAll = 10.0
         prefWidth = 732.0
         prefHeight = 401.0
         background = Background(BackgroundFill(Paint.valueOf("#cfcfcf"), CornerRadii.EMPTY, Insets.EMPTY))