Create and use custom overlay

Author: GeorgeRNG

src/main/java/io/github/techstreet/dfscript/DFScript.java

@@ -8,6 +8,7 @@
 import io.github.techstreet.dfscript.features.AuthHandler;
 import io.github.techstreet.dfscript.features.UpdateAlerts;
 import io.github.techstreet.dfscript.loader.Loader;
+import io.github.techstreet.dfscript.screen.overlay.OverlayManager;
 import io.github.techstreet.dfscript.screen.script.ScriptListScreen;
 import io.github.techstreet.dfscript.script.ScriptManager;
 import io.github.techstreet.dfscript.script.util.AuthcodeResponse;
@@ -80,6 +81,7 @@ public void onInitialize() {
         loader.load(new ScriptManager());
         loader.load(new Scheduler());
         loader.load(new UpdateAlerts());
+        loader.load(new OverlayManager());
 
         LOGGER.info("Initialized");
     }

src/main/java/io/github/techstreet/dfscript/mixin/render/MInGameHUD.java

@@ -3,6 +3,7 @@
 import io.github.techstreet.dfscript.DFScript;
 import io.github.techstreet.dfscript.event.HudRenderEvent;
 import io.github.techstreet.dfscript.event.system.EventManager;
+import io.github.techstreet.dfscript.screen.overlay.OverlayManager;
 import net.minecraft.client.MinecraftClient;
 import net.minecraft.client.gui.hud.InGameHud;
 import net.minecraft.client.util.math.MatrixStack;
@@ -24,6 +25,7 @@ private void renderScoreboardSidebar(CallbackInfo info) {
 
     @Inject(at = @At("HEAD"), method = "render")
     private void render(MatrixStack matrices, float tickDelta, CallbackInfo ci) {
+        OverlayManager.getInstance().render(matrices);
         EventManager em = EventManager.getInstance();
         em.dispatch(new HudRenderEvent(matrices));
         em.resetEvents();

src/main/java/io/github/techstreet/dfscript/screen/overlay/OverlayManager.java

@@ -0,0 +1,66 @@
+package io.github.techstreet.dfscript.screen.overlay;
+
+import io.github.techstreet.dfscript.DFScript;
+import io.github.techstreet.dfscript.loader.Loadable;
+import net.minecraft.client.util.math.MatrixStack;
+import net.minecraft.text.Text;
+
+import java.util.ArrayList;
+import java.util.Date;
+
+public class OverlayManager implements Loadable {
+    private static OverlayManager instance;
+
+    private ArrayList<Overlay> overlayText;
+
+    @Override
+    public void load() {
+        instance = this;
+        overlayText = new ArrayList<>();
+    }
+
+    private static class Overlay {
+        public Text text;
+        public Date time;
+        public Date by;
+
+        public Overlay(Text text) {
+            this.text = text;
+            this.time = new Date();
+            this.by = new Date(time.getTime() + 5000);
+        }
+
+        public boolean past() {
+            return new Date().after(by);
+        }
+    }
+
+    public void add(String text) {
+        add(Text.literal(text));
+    }
+    public void add(Text text) {
+        overlayText.add(new Overlay(text));
+    }
+
+    public void render(MatrixStack stack) {
+        while (overlayText.size() > 10) {
+            overlayText.remove(0);
+        }
+        int y = 10;
+        for (Overlay text: this.overlayText) {
+            if(text.past()) continue;
+            long now = new Date().getTime();
+            long fadeout = text.by.getTime() - 980;
+            int opacity = 0;
+            if(fadeout < now) {
+                opacity = (int) ((fadeout - now + 1000) * 255 / 1000);
+            }
+            DFScript.MC.textRenderer.drawWithShadow(stack, text.text, 10, y, 0xFF5555 + ((opacity) << 24));
+            y += 9;
+        }
+    }
+
+    public static OverlayManager getInstance() {
+        return instance;
+    }
+}