Rewrite screens in Java

Author: Juuxel

common/src/main/java/juuxel/adorn/client/gui/Scissors.java

@@ -0,0 +1,78 @@
+package juuxel.adorn.client.gui;
+
+import com.mojang.blaze3d.systems.RenderSystem;
+import net.minecraft.client.MinecraftClient;
+
+import java.util.ArrayDeque;
+import java.util.Deque;
+
+/**
+ * A global GL scissor stack that is applied when pushed and popped.
+ */
+public final class Scissors {
+    private static final Deque<Frame> STACK = new ArrayDeque<>();
+
+    /**
+     * Pushes a new scissor frame at {@code (x, y)} with dimensions {@code (width, height)}
+     * and refreshes the scissor state.
+     */
+    public static void push(int x, int y, int width, int height) {
+        push(new Frame(x, y, x + width, y + height));
+    }
+
+    /**
+     * Pushes a scissor frame and refreshes the scissor state.
+     */
+    public static void push(Frame frame) {
+        STACK.addLast(frame);
+        apply();
+    }
+
+    /**
+     * Pops the topmost scissor frame and refreshes the scissor state.
+     * If there are no remaining frames, disables scissoring.
+     */
+    public static Frame pop() {
+        var frame = STACK.removeLast();
+        apply();
+        return frame;
+    }
+
+    /**
+     * Temporarily disables the topmost scissor frame for executing the runnable.
+     */
+    public static void suspendScissors(Runnable fn) {
+        var frame = pop();
+        fn.run();
+        push(frame);
+    }
+
+    private static void apply() {
+        if (STACK.isEmpty()) {
+            RenderSystem.disableScissor();
+            return;
+        }
+
+        var window = MinecraftClient.getInstance().getWindow();
+        var x1 = 0;
+        var y1 = 0;
+        var x2 = window.getScaledWidth();
+        var y2 = window.getScaledHeight();
+
+        for (var frame : STACK) {
+            x1 = Math.max(x1, frame.x1);
+            y1 = Math.max(y1, frame.y1);
+            x2 = Math.min(x2, frame.x2);
+            y2 = Math.min(y2, frame.y2);
+        }
+
+        var scale = window.getScaleFactor();
+        RenderSystem.enableScissor(
+            (int) (x1 * scale), (int) (window.getFramebufferHeight() - scale * y2),
+            (int) ((x2 - x1) * scale), (int) ((y2 - y1) * scale)
+        );
+    }
+
+    public record Frame(int x1, int y1, int x2, int y2) {
+    }
+}

common/src/main/java/juuxel/adorn/client/gui/TradeTooltipComponent.java

@@ -0,0 +1,31 @@
+package juuxel.adorn.client.gui;
+
+import juuxel.adorn.AdornCommon;
+import juuxel.adorn.trading.Trade;
+import net.minecraft.client.font.TextRenderer;
+import net.minecraft.client.gui.DrawContext;
+import net.minecraft.client.gui.tooltip.TooltipComponent;
+import net.minecraft.util.Identifier;
+
+public record TradeTooltipComponent(Trade trade) implements TooltipComponent {
+    private static final Identifier ARROW_TEXTURE = AdornCommon.id("textures/gui/tooltip_arrow.png");
+
+    @Override
+    public int getWidth(TextRenderer textRenderer) {
+        return 3 * 16;
+    }
+
+    @Override
+    public int getHeight() {
+        return 18;
+    }
+
+    @Override
+    public void drawItems(TextRenderer textRenderer, int x, int y, DrawContext context) {
+        context.drawItem(trade.getPrice(), x, y);
+        context.drawItemInSlot(textRenderer, trade.getPrice(), x, y);
+        context.drawItem(trade.getSelling(), x + 2 * 16, y);
+        context.drawItemInSlot(textRenderer, trade.getSelling(), x + 2 * 16, y);
+        context.drawTexture(ARROW_TEXTURE, x + 16, y, 0f, 0f, 16, 16, 16, 16);
+    }
+}