Add Replay Editor (for now, trimming only)

src/main/java/com/replaymod/editor/handler/GuiHandler.java

@@ -0,0 +1,54 @@
+package com.replaymod.editor.handler;
+
+import com.replaymod.editor.ReplayModEditor;
+import com.replaymod.editor.gui.GuiReplayEditor;
+import de.johni0702.minecraft.gui.container.GuiScreen;
+import net.minecraft.client.gui.GuiButton;
+import net.minecraft.client.gui.GuiMainMenu;
+import net.minecraft.client.resources.I18n;
+import net.minecraftforge.client.event.GuiScreenEvent;
+import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.fml.common.FMLCommonHandler;
+import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
+
+import java.util.List;
+
+public class GuiHandler {
+    private static final int BUTTON_REPLAY_EDITOR = 17890237;
+
+    private final ReplayModEditor mod;
+
+    public GuiHandler(ReplayModEditor mod) {
+        this.mod = mod;
+    }
+
+    public void register() {
+        FMLCommonHandler.instance().bus().register(this);
+        MinecraftForge.EVENT_BUS.register(this);
+    }
+
+    @SubscribeEvent
+    public void injectIntoMainMenu(GuiScreenEvent.InitGuiEvent event) {
+        if (!(event.gui instanceof GuiMainMenu)) {
+            return;
+        }
+
+        @SuppressWarnings("unchecked")
+        List<GuiButton> buttonList = event.buttonList;
+        GuiButton button = new GuiButton(BUTTON_REPLAY_EDITOR, event.gui.width / 2 + 2,
+                event.gui.height / 4 + 10 + 3 * 24, I18n.format("replaymod.gui.replayeditor"));
+        button.width = button.width / 2 - 2;
+        buttonList.add(button);
+    }
+
+    @SubscribeEvent
+    public void onButton(GuiScreenEvent.ActionPerformedEvent.Pre event) {
+        if(!event.button.enabled) return;
+
+        if (event.gui instanceof GuiMainMenu) {
+            if (event.button.id == BUTTON_REPLAY_EDITOR) {
+                new GuiReplayEditor(GuiScreen.wrap(event.gui), mod.getCore()).display();
+            }
+        }
+    }
+}