Add "Server List" button in the Minecraft ESC GUI (#472)

* Add "Server List" button in the Minecraft pause GUI

This patch adds a new "Server List" button replacing the disabled
"Open To Lan" button in the multiplayer pause menu :)

* Optimize imports

Co-authored-by: Constructor <fractalminds@protonmail.com>

Author: Baitinq

src/main/java/com/lambda/mixin/gui/MixinGuiIngameMenu.java

@@ -5,6 +5,7 @@
 import com.lambda.client.util.Wrapper;
 import net.minecraft.client.gui.GuiButton;
 import net.minecraft.client.gui.GuiIngameMenu;
+import net.minecraft.client.gui.GuiMultiplayer;
 import net.minecraft.client.gui.GuiScreen;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.injection.At;
@@ -15,11 +16,26 @@
 public class MixinGuiIngameMenu extends GuiScreen {
     @Inject(method = "actionPerformed", at = @At("HEAD"), cancellable = true)
     public void actionPerformed(GuiButton button, CallbackInfo callbackInfo) {
-        if (button.id == 1) {
-            if (AntiDisconnect.INSTANCE.isEnabled()) {
-                Wrapper.getMinecraft().displayGuiScreen(new LambdaGuiAntiDisconnect());
-                callbackInfo.cancel();
-            }
+        switch (button.id) {
+            case 1:
+                if (AntiDisconnect.INSTANCE.isEnabled()) {
+                    Wrapper.getMinecraft().displayGuiScreen(new LambdaGuiAntiDisconnect());
+                    callbackInfo.cancel();
+                }
+                break;
+            case Integer.MIN_VALUE:
+                Wrapper.getMinecraft().displayGuiScreen(new GuiMultiplayer(this));
+                break;
+            default:
+                break;
+        }
+    }
+
+    @Inject(method = "initGui", at = @At("RETURN"))
+    public void initGui(CallbackInfo ci) {
+        if (!mc.isSingleplayer()) {
+            GuiButton openToLanButton = buttonList.remove(4);
+            buttonList.add(new GuiButton(Integer.MIN_VALUE, openToLanButton.x, openToLanButton.y, openToLanButton.width, openToLanButton.height, "Server List"));
         }
     }
 }

src/main/java/com/lambda/mixin/gui/MixinGuiMultiplayer.java

@@ -0,0 +1,22 @@
+package com.lambda.mixin.gui;
+
+import net.minecraft.client.gui.GuiMultiplayer;
+import net.minecraft.client.gui.GuiScreen;
+import net.minecraft.client.multiplayer.ServerData;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(GuiMultiplayer.class)
+public class MixinGuiMultiplayer extends GuiScreen {
+
+    @Inject(method = "connectToServer", at = @At("HEAD"))
+    public void connectToServer(ServerData serverData, CallbackInfo ci) {
+        if (mc.getCurrentServerData() != null && mc.world != null) {
+            mc.world.sendQuittingDisconnectingPacket();
+            mc.loadWorld(null);
+        }
+    }
+
+}

src/main/resources/mixins.lambda.json

@@ -47,6 +47,7 @@
     "gui.MixinGuiIngameMenu",
     "gui.MixinGuiInventory",
     "gui.MixinGuiMainMenu",
+    "gui.MixinGuiMultiplayer",
     "gui.MixinGuiNewChat",
     "gui.MixinGuiPlayerTabOverlay",
     "gui.MixinGuiScreen",