Add Drag-And-Drop support for digital tank (#1333)

* Add Drag-And-Drop support for digital tank

* lockedFluidName is null in old save

2 files changed, 82 insertions, 0 deletions

diff --git a/src/main/java/gregtech/api/interfaces/IDragAndDropSupport.java b/src/main/java/gregtech/api/interfaces/IDragAndDropSupport.java
new file mode 100644
index 0000000000..53b3a2b059
--- /dev/null
+++ b/src/main/java/gregtech/api/interfaces/IDragAndDropSupport.java
@@ -0,0 +1,53 @@
+package gregtech.api.interfaces;
+
+import codechicken.nei.NEIClientUtils;
+import codechicken.nei.VisiblityData;
+import codechicken.nei.api.INEIGuiHandler;
+import codechicken.nei.api.TaggedInventoryArea;
+import cpw.mods.fml.common.Optional;
+import java.util.Collections;
+import java.util.List;
+import net.minecraft.client.gui.inventory.GuiContainer;
+import net.minecraft.item.ItemStack;
+
+/**
+ * Implement this interface if your GuiContainer supports Drag-And-Drop behavior on NEI.
+ */
+@Optional.Interface(modid = "NotEnoughItems", iface = "codechicken.nei.api.INEIGuiHandler")
+public interface IDragAndDropSupport extends INEIGuiHandler {
+
+    /**
+     * Implement this to handle Drag-And-Drop behavior.
+     * This may be invoked on normal click too ({@code isGhost==false}), so be careful
+     * if your slot supports both Drag-And-Drop and other behaviors e.g. fluid I/O with FluidDisplay click
+     * @param gui Current gui instance. Make sure to check if it is an instance of your GuiContainer.
+     * @param mousex X position of the mouse
+     * @param mousey Y position of the mouse
+     * @param draggedStack ItemStack user is holding on cursor
+     * @param button 0 = left click, 1 = right click
+     * @param isGhost Whether {@code draggedStack} is dragged from ItemPanel/BookmarkPanel, or actual item player holds
+     * @return True if success
+     */
+    boolean handleDragAndDropGT(
+            GuiContainer gui, int mousex, int mousey, ItemStack draggedStack, int button, boolean isGhost);
+
+    default boolean handleDragNDrop(GuiContainer gui, int mousex, int mousey, ItemStack draggedStack, int button) {
+        return handleDragAndDropGT(gui, mousex, mousey, draggedStack, button, NEIClientUtils.getHeldItem() == null);
+    }
+
+    default VisiblityData modifyVisiblity(GuiContainer gui, VisiblityData currentVisibility) {
+        return currentVisibility;
+    }
+
+    default Iterable<Integer> getItemSpawnSlots(GuiContainer gui, ItemStack item) {
+        return Collections.emptyList();
+    }
+
+    default List<TaggedInventoryArea> getInventoryAreas(GuiContainer gui) {
+        return null;
+    }
+
+    default boolean hideItemPanelSlot(GuiContainer gui, int x, int y, int w, int h) {
+        return false;
+    }
+}
diff --git a/src/main/java/gregtech/api/interfaces/metatileentity/IFluidLockable.java b/src/main/java/gregtech/api/interfaces/metatileentity/IFluidLockable.java
new file mode 100644
index 0000000000..688a85b521
--- /dev/null
+++ b/src/main/java/gregtech/api/interfaces/metatileentity/IFluidLockable.java
@@ -0,0 +1,29 @@
+package gregtech.api.interfaces.metatileentity;
+
+import net.minecraftforge.fluids.Fluid;
+
+/**
+ * Implement this interface if your MetaTileEntity supports fluid lock mechanism.
+ */
+@SuppressWarnings({"BooleanMethodIsAlwaysInverted", "unused"})
+public interface IFluidLockable {
+
+    /**
+     * Use {@link Fluid#getName()} instead of {@link Fluid#getUnlocalizedName()} for fluid name
+     */
+    void setLockedFluidName(String name);
+
+    String getLockedFluidName();
+
+    /**
+     * Set fluid lock state.
+     * Would be useful when you don't necessarily want to change mode when locked fluid is changed.
+     */
+    void lockFluid(boolean lock);
+
+    boolean isFluidLocked();
+
+    boolean allowChangingLockedFluid(String name);
+
+    default void onFluidLockPacketReceived(String name) {}
+}