Make image preview scalable

src/main/kotlin/moe/nea/firmament/gui/config/HudMetaHandler.kt

@@ -0,0 +1,34 @@
+package moe.nea.firmament.gui.config
+
+import io.github.cottonmc.cotton.gui.widget.WButton
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonElement
+import kotlinx.serialization.json.decodeFromJsonElement
+import kotlinx.serialization.json.encodeToJsonElement
+import net.minecraft.text.MutableText
+import net.minecraft.text.Text
+import moe.nea.firmament.jarvis.JarvisIntegration
+import moe.nea.firmament.util.MC
+
+class HudMetaHandler(val config: ManagedConfig, val label: MutableText, val width: Int, val height: Int) :
+    ManagedConfig.OptionHandler<HudMeta> {
+    override fun toJson(element: HudMeta): JsonElement? {
+        return Json.encodeToJsonElement(element.position)
+    }
+
+    override fun fromJson(element: JsonElement): HudMeta {
+        return HudMeta(Json.decodeFromJsonElement(element), label, width, height)
+    }
+
+    override fun emitGuiElements(opt: ManagedConfig.Option<HudMeta>, guiAppender: GuiAppender) {
+        guiAppender.appendLabeledRow(opt.labelText, WButton(Text.translatable("firmament.hud.edit", label))
+            .also {
+                it.setOnClick {
+                    MC.screen = JarvisIntegration.jarvis.getHudEditor(
+                        guiAppender.screenAccessor.invoke(),
+                        listOf(opt.value)
+                    )
+                }
+            })
+    }
+}