1 files changed, 96 insertions, 0 deletions
diff --git a/src/main/java/pers/gwyog/gtneioreplugin/util/GuiRecipeHelper.java b/src/main/java/pers/gwyog/gtneioreplugin/util/GuiRecipeHelper.java
new file mode 100644
index 0000000000..78d43f1bdd
--- /dev/null
+++ b/src/main/java/pers/gwyog/gtneioreplugin/util/GuiRecipeHelper.java
@@ -0,0 +1,96 @@
+package pers.gwyog.gtneioreplugin.util;
+
+import java.lang.reflect.Field;
+
+import org.apache.logging.log4j.Level;
+
+import codechicken.nei.recipe.GuiRecipe;
+import cpw.mods.fml.common.FMLLog;
+import net.minecraft.client.Minecraft;
+
+public class GuiRecipeHelper {
+    private static final String INIT_ERROR = "pers.gwyog.gtneioreplugin.util.GuiRecipeHelper failed setting up reflection : ";
+    private static final int DEFAULT_XSIZE = 176;
+
+    private static Class<GuiRecipe> guiRecipeClass;
+    public static Field xSizeField;
+    public static Field guiLeftField;
+    public static Field guiTopField;
+
+    /**
+     * Access the xSize field of a GuiRecipe instance, or use a fallback hardcoded value if that fails
+     * 
+     * @param gui GuiRecipe object
+     * @return Integer value of the xSize field of that object
+     */
+    public static int getXSize(GuiRecipe gui) {
+        if (xSizeField != null) {
+            try {
+                return (int) xSizeField.get(gui);
+            } catch (IllegalAccessException e) {
+                // Fail silently, hoping that it it fails it will be during initialization
+            }
+        }
+        
+        // Fallback should work unless codechicken.nei.recipe.GuiRecipe implementation changes
+        return DEFAULT_XSIZE;
+    }
+
+
+    /**
+     * Access the guiLeft field of a GuiRecipe instance, or use a fallback hardcoded value if that fails
+     * 
+     * @param gui GuiRecipe object
+     * @return Integer value of the guiLeft field of that object
+     */
+    public static int getGuiLeft(GuiRecipe gui) {
+        if (guiLeftField != null) {
+            try {
+                return (int) guiLeftField.get(gui);
+            } catch (IllegalAccessException e) {
+                // Fail silently, hoping that it it fails it will be during initialization
+            }
+        }
+        
+        // Fallback should work unless codechicken.nei.recipe.GuiRecipe implementation changes
+        return (Minecraft.getMinecraft().currentScreen.width - DEFAULT_XSIZE) / 2;
+    }
+    
+    /**
+     * Access the guiTop field of a GuiRecipe instance, or use a fallback hardcoded value if that fails
+     * 
+     * @param gui GuiRecipe object
+     * @return Integer value of the guiTop field of that object
+     */
+    public static int getGuiTop(GuiRecipe gui) {
+        if (guiTopField != null) {
+            try {
+                return (int) guiTopField.get(gui);
+            } catch (IllegalAccessException e) {
+                // Fail silently, hoping that it it fails it will be during initialization
+            }
+        }
+        
+        // Fallback should work unless codechicken.nei.recipe.GuiRecipe implementation changes
+        int height = Minecraft.getMinecraft().currentScreen.height;
+        int ySize = Math.min(Math.max(height - 68, 166), 370);
+        return (height - ySize) / 2 + 10;
+    }
+
+    /**
+     * Initialize the GuiRecipe Field accessors through reflection
+     */
+    public GuiRecipeHelper() {
+        guiRecipeClass = GuiRecipe.class;
+        try {
+            guiLeftField =  guiRecipeClass.getField("guiLeft");
+            guiLeftField.setAccessible(true);
+            guiTopField = guiRecipeClass.getField("guiTop");
+            guiTopField.setAccessible(true);
+            xSizeField = guiRecipeClass.getField("xSize");
+            xSizeField.setAccessible(true);
+        } catch(NoSuchFieldException|SecurityException e) {
+            FMLLog.log(Level.ERROR, INIT_ERROR + e.getMessage());
+        }
+    }
+}