1 files changed, 80 insertions, 0 deletions
diff --git a/src/main/java/io/github/moulberry/notenoughupdates/TooltipTextScrolling.java b/src/main/java/io/github/moulberry/notenoughupdates/TooltipTextScrolling.java
new file mode 100644
index 00000000..ccb28dd6
--- /dev/null
+++ b/src/main/java/io/github/moulberry/notenoughupdates/TooltipTextScrolling.java
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2023 NotEnoughUpdates contributors
+ *
+ * This file is part of NotEnoughUpdates.
+ *
+ * NotEnoughUpdates is free software: you can redistribute it
+ * and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * NotEnoughUpdates is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with NotEnoughUpdates. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package io.github.moulberry.notenoughupdates;
+
+import io.github.moulberry.notenoughupdates.autosubscribe.NEUAutoSubscribe;
+import net.minecraftforge.client.event.GuiScreenEvent;
+import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
+import net.minecraftforge.fml.common.gameevent.TickEvent;
+import org.lwjgl.input.Mouse;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+@NEUAutoSubscribe
+public class TooltipTextScrolling {
+	static List<String> lastRenderedTooltip = null;
+	static int scrollOffset = 0;
+	static boolean didRenderTooltip = false;
+
+	public static List<String> handleTextLineRendering(List<String> tooltip) {
+		didRenderTooltip = true;
+		if (!Objects.equals(tooltip, lastRenderedTooltip)) {
+			lastRenderedTooltip = new ArrayList<>(tooltip);
+			scrollOffset = 0;
+			return tooltip;
+		}
+		lastRenderedTooltip = new ArrayList<>(tooltip);
+		List<String> modifiableTooltip = new ArrayList<>(tooltip);
+		for (int i = 0; i < scrollOffset && modifiableTooltip.size() > 1; i++) {
+			modifiableTooltip.remove(0);
+		}
+		for (int i = 0; i < -scrollOffset && modifiableTooltip.size() > 1; i++) {
+			modifiableTooltip.remove(modifiableTooltip.size() - 1);
+		}
+		return modifiableTooltip;
+	}
+
+	@SubscribeEvent
+	public void onMouse(GuiScreenEvent.MouseInputEvent.Pre event) {
+		if (!NotEnoughUpdates.INSTANCE.config.tooltipTweaks.scrollableTooltips) return;
+		if (Mouse.getEventDWheel() < 0) {
+			scrollOffset = Math.max(
+				lastRenderedTooltip == null ? 0 : -Math.max(lastRenderedTooltip.size() - 1, 0)
+				, scrollOffset - 1
+			);
+		} else if (Mouse.getEventDWheel() > 0) {
+			scrollOffset = Math.min(
+				lastRenderedTooltip == null ? 0 : Math.max(lastRenderedTooltip.size() - 1, 0),
+				scrollOffset + 1
+			);
+		}
+	}
+
+	@SubscribeEvent
+	public void onTick(TickEvent.RenderTickEvent event) {
+		if (event.phase == TickEvent.Phase.START) {
+			didRenderTooltip = false;
+		} else if (!didRenderTooltip) {
+			lastRenderedTooltip = null;
+		}
+	}
+}