1 files changed, 68 insertions, 0 deletions
diff --git a/src/main/java/cc/woverflow/chatting/mixin/GuiNewChatMixin_Scrolling.java b/src/main/java/cc/woverflow/chatting/mixin/GuiNewChatMixin_Scrolling.java
new file mode 100644
index 0000000..99b7cbf
--- /dev/null
+++ b/src/main/java/cc/woverflow/chatting/mixin/GuiNewChatMixin_Scrolling.java
@@ -0,0 +1,68 @@
+package cc.woverflow.chatting.mixin;
+
+import cc.polyfrost.oneconfig.gui.animations.EaseOutQuad;
+import cc.polyfrost.oneconfig.utils.MathUtils;
+import cc.woverflow.chatting.config.ChattingConfig;
+import net.minecraft.client.gui.ChatLine;
+import net.minecraft.client.gui.Gui;
+import net.minecraft.client.gui.GuiNewChat;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.Unique;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.Redirect;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import java.util.List;
+
+@Mixin(GuiNewChat.class)
+public abstract class GuiNewChatMixin_Scrolling extends Gui {
+    @Shadow private int scrollPos;
+    @Shadow @Final private List<ChatLine> drawnChatLines;
+
+    @Shadow public abstract int getLineCount();
+
+    @Shadow private boolean isScrolled;
+
+    @Unique
+    private EaseOutQuad chatting$scrollingAnimation;
+
+    @Inject(method = "drawChat", at = @At("HEAD"))
+    private void chatting$scrollingAnimationStart(int updateCounter, CallbackInfo ci) {
+        if (chatting$scrollingAnimation != null) {
+            if (chatting$scrollingAnimation.isFinished()) {
+                if (scrollPos == 0) {
+                    isScrolled = false;
+                }
+                chatting$scrollingAnimation = null;
+            } else {
+                scrollPos = (int) chatting$scrollingAnimation.get();
+            }
+        }
+    }
+
+    @Redirect(method = "drawChat", at = @At(value = "INVOKE", target = "Lnet/minecraft/client/gui/GuiNewChat;drawRect(IIIII)V", ordinal = 1))
+    private void redirectScrollBar(int left, int top, int right, int bottom, int color) {
+        if (!ChattingConfig.INSTANCE.getRemoveScrollBar()) {
+            drawRect(left, top, right, bottom, color);
+        }
+    }
+
+    @Redirect(method = "drawChat", at = @At(value = "INVOKE", target = "Lnet/minecraft/client/gui/GuiNewChat;drawRect(IIIII)V", ordinal = 2))
+    private void redirectScrollBar2(int left, int top, int right, int bottom, int color) {
+        if (!ChattingConfig.INSTANCE.getRemoveScrollBar()) {
+            drawRect(left, top, right, bottom, color);
+        }
+    }
+
+    @Inject(method = "scroll", at = @At("HEAD"), cancellable = true)
+    private void injectScroll(int amount, CallbackInfo ci) {
+        if (ChattingConfig.INSTANCE.getSmoothScrolling() && amount > 1) {
+            ci.cancel();
+            int result = (int) MathUtils.clamp(scrollPos + amount, 0, drawnChatLines.size() - getLineCount() - 1);
+            chatting$scrollingAnimation = new EaseOutQuad(150, scrollPos, result, false);
+        }
+    }
+}