Fix Mouse Interactions with Scrollbar

src/main/java/com/nomiceu/nomilabs/mixin/betterp2p/WidgetScrollBarMixin.java

@@ -0,0 +1,61 @@
+package com.nomiceu.nomilabs.mixin.betterp2p;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import com.projecturanus.betterp2p.client.gui.widget.WidgetScrollBar;
+
+/**
+ * Fixes clicking scrollbar.
+ */
+@Mixin(value = WidgetScrollBar.class, remap = false)
+public abstract class WidgetScrollBarMixin {
+
+    @Shadow
+    protected abstract int getRange();
+
+    @Shadow
+    private int displayX;
+
+    @Shadow
+    private int width;
+
+    @Shadow
+    private int displayY;
+
+    @Shadow
+    private int height;
+
+    @Shadow
+    private int currentScroll;
+
+    @Shadow
+    private int minScroll;
+
+    @Shadow
+    private boolean moving;
+
+    @Shadow
+    protected abstract void applyRange();
+
+    @Inject(method = "click", at = @At("HEAD"), cancellable = true)
+    private void properlyHandleClick(int x, int y, CallbackInfo ci) {
+        ci.cancel();
+        if (getRange() == 0) {
+            return;
+        }
+
+        if (y > displayY && y <= displayY + height) {
+            if (x > displayX && x <= displayX + width) {
+                currentScroll = y - displayY;
+                currentScroll = minScroll + currentScroll * 2 * getRange() / height;
+                currentScroll = (currentScroll + 1) >> 1;
+                applyRange();
+                moving = true;
+            }
+        }
+    }
+}

src/main/resources/mixins.nomilabs.betterp2p.json

@@ -20,6 +20,7 @@
     "RenderHandlerMixin",
     "WidgetP2PColumnMixin",
     "WidgetP2PDeviceMixin",
+    "WidgetScrollBarMixin",
     "WidgetTypeSelectorMixin"
   ],
   "server": []