[Editor] Enable graphic assets preview in Project Structure panel

Because the new map creation is done in different place than saving
already existing maps, there is a bug that no snapshot is created
when new map is created. The snapshots only are created when
map is saved (Save via button with floppy disk icon in Map View
toolbar).

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/asset/model/Asset.kt

@@ -15,4 +15,8 @@ abstract class Asset(directory: ObjectProperty<File>, val uid: String, val sourc
    val file by fileProperty
 
    override fun toString() = "${this.javaClass.simpleName}[name=$name, uid=$uid]"
+
+   open fun delete() {
+      file.delete()
+   }
 }

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/asset/model/GraphicAsset.kt

@@ -0,0 +1,27 @@
+package com.bartlomiejpluta.base.editor.asset.model
+
+import javafx.beans.binding.Bindings.createObjectBinding
+import javafx.beans.property.ObjectProperty
+import tornadofx.getValue
+import java.io.File
+
+abstract class GraphicAsset(
+   assetDirectory: ObjectProperty<File>,
+   graphicDirectory: ObjectProperty<File>,
+   uid: String,
+   assetSource: String,
+   val graphicSource: String,
+   name: String
+) : Asset(assetDirectory, uid, assetSource, name) {
+
+   constructor(directory: ObjectProperty<File>, uid: String, source: String, name: String)
+         : this(directory, directory, uid, source, source, name)
+
+   val graphicFileProperty = createObjectBinding({ File(graphicDirectory.value, graphicSource) }, graphicDirectory)
+   val graphicFile by graphicFileProperty
+
+   override fun delete() {
+      super.delete()
+      graphicFile.delete()
+   }
+}

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/image/asset/ImageAsset.kt

@@ -1,7 +1,7 @@
 package com.bartlomiejpluta.base.editor.image.asset
 
-import com.bartlomiejpluta.base.editor.asset.model.Asset
+import com.bartlomiejpluta.base.editor.asset.model.GraphicAsset
 import com.bartlomiejpluta.base.editor.project.model.Project
 
 class ImageAsset(project: Project, uid: String, source: String, name: String) :
-   Asset(project.imagesDirectoryProperty, uid, source, name)
+   GraphicAsset(project.imagesDirectoryProperty, uid, source, name)

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/main/view/ProjectStructureView.kt

@@ -1,20 +1,22 @@
 package com.bartlomiejpluta.base.editor.main.view
 
 import com.bartlomiejpluta.base.editor.asset.model.Asset
+import com.bartlomiejpluta.base.editor.asset.model.GraphicAsset
 import com.bartlomiejpluta.base.editor.image.asset.ImageAsset
 import com.bartlomiejpluta.base.editor.main.controller.MainController
 import com.bartlomiejpluta.base.editor.map.asset.GameMapAsset
 import com.bartlomiejpluta.base.editor.project.context.ProjectContext
 import com.bartlomiejpluta.base.editor.tileset.asset.TileSetAsset
 import javafx.beans.binding.Bindings
+import javafx.beans.binding.Bindings.createObjectBinding
+import javafx.beans.property.SimpleObjectProperty
 import javafx.beans.property.SimpleStringProperty
 import javafx.collections.ObservableList
 import javafx.scene.Node
-import javafx.scene.control.ContextMenu
-import javafx.scene.control.MenuItem
-import javafx.scene.control.TreeCell
-import javafx.scene.control.TreeItem
+import javafx.scene.control.*
 import javafx.scene.control.cell.TextFieldTreeCell
+import javafx.scene.image.Image
+import javafx.scene.layout.Priority
 import javafx.util.StringConverter
 import org.kordamp.ikonli.javafx.FontIcon
 import tornadofx.*
@@ -44,6 +46,17 @@ class ProjectStructureView : View() {
       )
    )
 
+   private var projectStructure: TreeView<Any> by singleAssign()
+
+   private val selectedItem = SimpleObjectProperty<Any>()
+
+   private val graphicAssetPreview = createObjectBinding({
+      when (val item = selectedItem.value) {
+         is GraphicAsset -> item.graphicFile.inputStream().use { Image(it) }
+         else -> null
+      }
+   }, selectedItem).apply { addListener { _, _, v -> println(v) } }
+
    init {
       projectContext.projectProperty.addListener { _, _, project ->
          project?.let {
@@ -51,13 +64,16 @@ class ProjectStructureView : View() {
             Bindings.bindContent(structureMaps.items, it.maps)
             Bindings.bindContent(structureTileSets.items, it.tileSets)
             Bindings.bindContent(structureImages.items, it.images)
-            root.root.expandAll()
-            root.refresh()
+            projectStructure.root.expandAll()
+            projectStructure.refresh()
          }
       }
    }
 
-   override val root = treeview<Any> {
+   override val root = vbox {
+      projectStructure = treeview {
+         vgrow = Priority.ALWAYS
+
          root = TreeItem(structureRoot)
 
          populate {
@@ -80,6 +96,17 @@ class ProjectStructureView : View() {
 
             event.consume()
          }
+
+         bindSelected(selectedItem)
+      }
+
+      scrollpane {
+         vgrow = Priority.SOMETIMES
+         prefWidth = 200.0
+         prefHeight = 200.0
+         removeWhen(graphicAssetPreview.isNull)
+         imageview(graphicAssetPreview)
+      }
    }
 
    private fun renameAsset(asset: Asset, name: String) = asset.apply {

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/map/asset/GameMapAsset.kt

@@ -1,7 +1,7 @@
 package com.bartlomiejpluta.base.editor.map.asset
 
-import com.bartlomiejpluta.base.editor.asset.model.Asset
+import com.bartlomiejpluta.base.editor.asset.model.GraphicAsset
 import com.bartlomiejpluta.base.editor.project.model.Project
 
 class GameMapAsset(project: Project, uid: String, name: String) :
-   Asset(project.mapsDirectoryProperty, uid, "$uid.dat", name)
+   GraphicAsset(project.mapsDirectoryProperty, project.mapsDirectoryProperty, uid, "$uid.dat", "$uid.png", name)

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/map/canvas/MapCanvas.kt

@@ -70,6 +70,11 @@ class MapCanvas(val map: GameMapVM, private val editorStateVM: EditorStateVM, pr
    override fun render(gc: GraphicsContext) {
       gc.clearRect(0.0, 0.0, gc.canvas.width, gc.canvas.height)
 
+      if (editorStateVM.takingSnapshot) {
+         renderForPhoto(gc)
+         return
+      }
+
       renderBackground(gc)
       renderUnderlyingLayers(gc)
       renderCover(gc)
@@ -78,6 +83,10 @@ class MapCanvas(val map: GameMapVM, private val editorStateVM: EditorStateVM, pr
       painter.render(gc)
    }
 
+   private fun renderForPhoto(gc: GraphicsContext) {
+      map.layers.forEach { dispatchLayerRender(gc, it) }
+   }
+
    private fun renderSelectedLayer(gc: GraphicsContext) {
       map.layers.getOrNull(editorStateVM.selectedLayerIndex)?.let { dispatchLayerRender(gc, it) }
    }

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/map/controller/MapController.kt

@@ -2,6 +2,7 @@ package com.bartlomiejpluta.base.editor.map.controller
 
 import com.bartlomiejpluta.base.editor.map.model.map.GameMap
 import com.bartlomiejpluta.base.editor.project.context.ProjectContext
+import javafx.scene.image.Image
 import org.springframework.stereotype.Component
 import tornadofx.Controller
 
@@ -9,7 +10,7 @@ import tornadofx.Controller
 class MapController : Controller() {
    private val projectContext: ProjectContext by di()
 
-   fun saveMap(map: GameMap) {
-      projectContext.saveMap(map)
+   fun saveMap(map: GameMap, image: Image) {
+      projectContext.saveMap(map, image)
    }
 }

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/map/view/editor/MapFragment.kt

@@ -1,8 +1,10 @@
 package com.bartlomiejpluta.base.editor.map.view.editor
 
 import com.bartlomiejpluta.base.editor.command.context.UndoableScope
+import com.bartlomiejpluta.base.editor.map.controller.MapController
 import com.bartlomiejpluta.base.editor.map.model.layer.TileLayer
 import com.bartlomiejpluta.base.editor.map.viewmodel.EditorStateVM
+import com.bartlomiejpluta.base.editor.map.viewmodel.GameMapVM
 import com.bartlomiejpluta.base.editor.tileset.view.editor.TileSetView
 import javafx.beans.binding.Bindings
 import tornadofx.*
@@ -11,12 +13,15 @@ import tornadofx.*
 class MapFragment : Fragment() {
    override val scope = super.scope as UndoableScope
 
+   private val mapController: MapController by di()
+
    private val editorStateVM = find<EditorStateVM>()
+   private val mapVM = find<GameMapVM>()
 
    private val mapView = find<MapView>()
    private val layersView = find<MapLayersView>()
    private val tileSetView = find<TileSetView>()
-   private val toolbarView = find<MapToolbarView>()
+   private val toolbarView = find<MapToolbarView>(MapToolbarView::onSaveMap to this::saveMap)
    private val statusBarView = find<MapStatusBarView>()
    private val layerParameters = find<MapLayerParameters>()
 
@@ -25,6 +30,10 @@ class MapFragment : Fragment() {
       editorStateVM.selectedLayerProperty
    )
 
+   private fun saveMap() {
+      mapController.saveMap(mapVM.item, mapView.snapshot())
+   }
+
    override val root = borderpane {
       top = toolbarView.root
 

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/map/view/editor/MapToolbarView.kt

@@ -19,6 +19,8 @@ class MapToolbarView : View() {
    private val undoRedoService: UndoRedoService by di()
    private val mapController: MapController by di()
 
+   val onSaveMap: () -> Unit by param()
+
    override val scope = super.scope as UndoableScope
 
    private val mapVM = find<GameMapVM>()
@@ -45,7 +47,7 @@ class MapToolbarView : View() {
       button(graphic = FontIcon("fa-floppy-o")) {
          shortcut("Ctrl+S")
          action {
-            mapController.saveMap(mapVM.item)
+            onSaveMap()
          }
       }
 

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/map/view/editor/MapView.kt

@@ -7,6 +7,7 @@ import com.bartlomiejpluta.base.editor.map.component.MapPane
 import com.bartlomiejpluta.base.editor.map.viewmodel.BrushVM
 import com.bartlomiejpluta.base.editor.map.viewmodel.EditorStateVM
 import com.bartlomiejpluta.base.editor.map.viewmodel.GameMapVM
+import javafx.scene.image.Image
 import javafx.scene.input.MouseButton
 import javafx.scene.input.MouseEvent
 import javafx.scene.transform.Scale
@@ -41,6 +42,16 @@ class MapView : View() {
       subscribe<RedrawMapRequestEvent> { mapPane.render() }
    }
 
+   fun snapshot(): Image {
+      editorStateVM.takingSnapshot = true
+      mapPane.render()
+
+      return mapPane.snapshot(null, null).also {
+         editorStateVM.takingSnapshot = false
+         mapPane.render()
+      }
+   }
+
    override val root = scrollpane {
       prefWidth = 640.0
       prefHeight = 480.0

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/map/viewmodel/EditorStateVM.kt

@@ -30,4 +30,7 @@ class EditorStateVM : ViewModel() {
 
    val cursorColumnProperty = SimpleIntegerProperty(-1)
    val cursorColumn by cursorColumnProperty
+
+   val takingSnapshotProperty = SimpleBooleanProperty(false)
+   var takingSnapshot by takingSnapshotProperty
 }

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/project/context/DefaultProjectContext.kt

@@ -13,6 +13,7 @@ import com.bartlomiejpluta.base.editor.project.serial.ProjectSerializer
 import com.bartlomiejpluta.base.editor.tileset.asset.TileSetAsset
 import com.bartlomiejpluta.base.editor.tileset.asset.TileSetAssetData
 import com.bartlomiejpluta.base.editor.tileset.model.TileSet
+import com.bartlomiejpluta.base.editor.util.fx.ImageUtil
 import com.bartlomiejpluta.base.editor.util.uid.UID
 import javafx.beans.property.ObjectProperty
 import javafx.beans.property.SimpleObjectProperty
@@ -24,6 +25,7 @@ import tornadofx.setValue
 import java.io.File
 import java.io.FileInputStream
 import java.io.FileOutputStream
+import kotlin.math.min
 
 @Component
 class DefaultProjectContext : ProjectContext {
@@ -88,11 +90,14 @@ class DefaultProjectContext : ProjectContext {
       File(it.mapsDirectory, asset.source).inputStream().use { fis -> mapDeserializer.deserialize(fis) }
    } ?: throw IllegalStateException("There is no open project in the context")
 
-   override fun saveMap(map: GameMap) {
+   override fun saveMap(map: GameMap, image: Image) {
       project?.let {
          val asset = it.maps.firstOrNull { asset -> asset.uid == map.uid }
             ?: throw IllegalStateException("The map with uid [${map.uid}] does not exist ")
 
+         val thumbnail = ImageUtil.scale(image, min(200, map.width.toInt()), min(200, map.height.toInt()), true)
+
+         ImageUtil.save(thumbnail, asset.graphicFile)
          File(it.mapsDirectory, asset.source).outputStream().use { fos -> mapSerializer.serialize(map, fos) }
       }
    }
@@ -151,7 +156,7 @@ class DefaultProjectContext : ProjectContext {
          it.assetLists.firstOrNull { assets -> assets.remove(asset) }
             ?: throw IllegalStateException("The asset does not belong to any of the assets lists")
 
-         asset.file.delete()
+         asset.delete()
       } ?: throw IllegalStateException("There is no open project in the context")
    }
 }

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/project/context/ProjectContext.kt

@@ -20,7 +20,7 @@ interface ProjectContext {
 
    fun importMap(name: String, map: GameMap)
    fun loadMap(uid: String): GameMap
-   fun saveMap(map: GameMap)
+   fun saveMap(map: GameMap, image: Image)
 
    fun importTileSet(data: TileSetAssetData)
    fun loadTileSet(uid: String): TileSet

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/tileset/asset/TileSetAsset.kt

@@ -1,7 +1,7 @@
 package com.bartlomiejpluta.base.editor.tileset.asset
 
-import com.bartlomiejpluta.base.editor.asset.model.Asset
+import com.bartlomiejpluta.base.editor.asset.model.GraphicAsset
 import com.bartlomiejpluta.base.editor.project.model.Project
 
 class TileSetAsset(project: Project, uid: String, source: String, name: String, val rows: Int, val columns: Int) :
-   Asset(project.tileSetsDirectoryProperty, uid, source, name)
+   GraphicAsset(project.tileSetsDirectoryProperty, uid, source, name)

editor/src/main/kotlin/com/bartlomiejpluta/base/editor/util/fx/ImageUtil.kt

@@ -0,0 +1,28 @@
+package com.bartlomiejpluta.base.editor.util.fx
+
+import javafx.scene.image.Image
+import javafx.scene.image.ImageView
+import java.awt.image.BufferedImage
+import java.io.File
+import javax.imageio.ImageIO
+
+object ImageUtil {
+   fun scale(source: Image, targetWidth: Int, targetHeight: Int, preserveRatio: Boolean) = ImageView(source).apply {
+      this.isSmooth = false
+      this.isPreserveRatio = preserveRatio
+      this.fitWidth = targetWidth.toDouble()
+      this.fitHeight = targetHeight.toDouble()
+   }.snapshot(null, null)
+
+   fun save(image: Image, file: File) {
+      val buffered = BufferedImage(image.width.toInt(), image.height.toInt(), BufferedImage.TYPE_INT_ARGB)
+      val reader = image.pixelReader
+      for (x in 0 until image.width.toInt()) {
+         for (y in 0 until image.height.toInt()) {
+            buffered.setRGB(x, y, reader.getArgb(x, y))
+         }
+      }
+
+      ImageIO.write(buffered, file.extension, file)
+   }
+}