GuiDescription: Add get/setUseDefaultRootBackground

This is useful for removing no-op addPainters overrides and replacing them
with a one-line method call when you don't want the default vanilla-style
background for a panel.

src/main/java/io/github/cottonmc/cotton/gui/GuiDescription.java

@@ -58,7 +58,26 @@ public interface GuiDescription {
 	/** Guis should use this method to add clientside styles and BackgroundPainters to their controls */
 	@Environment(EnvType.CLIENT)
 	public void addPainters();
-
+
+	/**
+	 * Tests whether the root panel should get a {@linkplain io.github.cottonmc.cotton.gui.client.BackgroundPainter#VANILLA
+	 * vanilla background} in the default {@link #addPainters} implementations.
+	 *
+	 * @return {@code true} if the default background painter is applied, {@code false} otherwise
+	 * @since 12.0.0
+	 */
+	public boolean getUseDefaultRootBackground();
+
+	/**
+	 * Enables or disables the default {@linkplain io.github.cottonmc.cotton.gui.client.BackgroundPainter#VANILLA
+	 * vanilla background} for root panels.
+	 *
+	 * @param useDefaultRootBackground {@code true} if the default background painter is applied, {@code false} otherwise
+	 * @see #getUseDefaultRootBackground
+	 * @since 12.0.0
+	 */
+	public void setUseDefaultRootBackground(boolean useDefaultRootBackground);
+
 	/** Gets the object which manages the integer properties used by WBars and such. */
 	@Nullable
 	public PropertyDelegate getPropertyDelegate();

src/main/java/io/github/cottonmc/cotton/gui/SyncedGuiDescription.java

@@ -59,6 +59,7 @@ public class SyncedGuiDescription extends ScreenHandler implements GuiDescriptio
 
 	protected WWidget focus;
 	private Vec2i titlePos = new Vec2i(8, 6);
+	private boolean useDefaultRootBackground = true;
 
 	/**
 	 * Constructs a new synced GUI description without a block inventory or a property delegate.
@@ -123,11 +124,21 @@ public SyncedGuiDescription setTitleColor(int lightColor, int darkColor) {
 
 	@Environment(EnvType.CLIENT)
 	public void addPainters() {
-		if (this.rootPanel!=null && !fullscreen) {
+		if (this.rootPanel!=null && !fullscreen && getUseDefaultRootBackground()) {
 			this.rootPanel.setBackgroundPainter(BackgroundPainter.VANILLA);
 		}
 	}
-
+
+	@Override
+	public boolean getUseDefaultRootBackground() {
+		return useDefaultRootBackground;
+	}
+
+	@Override
+	public void setUseDefaultRootBackground(boolean useDefaultRootBackground) {
+		this.useDefaultRootBackground = useDefaultRootBackground;
+	}
+
 	public void addSlotPeer(ValidatedSlot slot) {
 		this.addSlot(slot);
 	}

src/main/java/io/github/cottonmc/cotton/gui/client/LightweightGuiDescription.java

@@ -27,6 +27,7 @@ public class LightweightGuiDescription implements GuiDescription {
 	protected boolean titleVisible = true;
 	protected HorizontalAlignment titleAlignment = HorizontalAlignment.LEFT;
 	private Vec2i titlePos = new Vec2i(8, 6);
+	private boolean useDefaultRootBackground = true;
 
 	@Override
 	public WPanel getRootPanel() {
@@ -60,11 +61,21 @@ public GuiDescription setTitleColor(int lightColor, int darkColor) {
 
 	@Override
 	public void addPainters() {
-		if (this.rootPanel!=null && !fullscreen) {
+		if (this.rootPanel!=null && !fullscreen && getUseDefaultRootBackground()) {
 			this.rootPanel.setBackgroundPainter(BackgroundPainter.VANILLA);
 		}
 	}
 
+	@Override
+	public boolean getUseDefaultRootBackground() {
+		return useDefaultRootBackground;
+	}
+
+	@Override
+	public void setUseDefaultRootBackground(boolean useDefaultRootBackground) {
+		this.useDefaultRootBackground = useDefaultRootBackground;
+	}
+
 	@Override
 	public void addSlotPeer(ValidatedSlot slot) {
 		//NO-OP

src/testMod/java/io/github/cottonmc/test/client/TabTestGui.java

@@ -17,10 +17,7 @@ public TabTestGui() {
 
 		tabs.setSize(7 * 18, 5 * 18);
 		setRootPanel(tabs);
+		setUseDefaultRootBackground(false);
 		getRootPanel().validate(this);
 	}
-
-	@Override
-	public void addPainters() {
-	}
 }

src/testMod/java/io/github/cottonmc/test/client/TextAlignmentTestGui.java

@@ -57,6 +57,7 @@ public TextAlignmentTestGui() {
 		tabPanel.add(labelPanel, builder -> builder.title(Text.of("WLabel")));
 		tabPanel.add(textPanel, builder -> builder.title(Text.of("WText")));
 		setRootPanel(tabPanel);
+		setUseDefaultRootBackground(false);
 		tabPanel.validate(this);
 	}
 
@@ -68,8 +69,4 @@ private static <E extends Enum<E>> WLabeledSlider forEnum(Class<E> type, Consume
 		slider.setValueChangeListener(value -> consumer.accept(values[value - 1]));
 		return slider;
 	}
-
-	@Override
-	public void addPainters() {
-	}
 }

src/testMod/java/io/github/cottonmc/test/client/TextureTestGui.java

@@ -30,14 +30,10 @@ public TextureTestGui() {
 		root.add(createPanel(simpleSprite), tab -> tab.icon(new TextureIcon(simpleSprite)).tooltip(Text.literal("Simple sprite")));
 		root.add(createPanel(panelTexture), tab -> tab.icon(new TextureIcon(panelTexture)).tooltip(Text.literal("Standalone")));
 		setRootPanel(root);
+		setUseDefaultRootBackground(false);
 		root.validate(this);
 	}
 
-	@Override
-	public void addPainters() {
-		// Remove tab panel background
-	}
-
 	private WPanel createPanel(Texture texture) {
 		WSprite sprite = new WSprite(texture);