Code/net/minecraft/client/gui/components/PopupScreen.java

package net.minecraft.client.gui.components;

import com.mojang.blaze3d.systems.RenderSystem;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Consumer;
import javax.annotation.Nullable;
import net.minecraft.ChatFormatting;
import net.minecraft.client.gui.GuiGraphics;
import net.minecraft.client.gui.components.events.GuiEventListener;
import net.minecraft.client.gui.layouts.FrameLayout;
import net.minecraft.client.gui.layouts.LinearLayout;
import net.minecraft.client.gui.screens.Screen;
import net.minecraft.client.renderer.RenderType;
import net.minecraft.network.chat.CommonComponents;
import net.minecraft.network.chat.Component;
import net.minecraft.resources.ResourceLocation;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.api.distmarker.OnlyIn;

@OnlyIn(Dist.CLIENT)
public class PopupScreen extends Screen {
    private static final ResourceLocation BACKGROUND_SPRITE = ResourceLocation.withDefaultNamespace("popup/background");
    private static final int SPACING = 12;
    private static final int BG_BORDER_WITH_SPACING = 18;
    private static final int BUTTON_SPACING = 6;
    private static final int IMAGE_SIZE_X = 130;
    private static final int IMAGE_SIZE_Y = 64;
    private static final int POPUP_DEFAULT_WIDTH = 250;
    private final Screen backgroundScreen;
    @Nullable
    private final ResourceLocation image;
    private final Component message;
    private final List<PopupScreen.ButtonOption> buttons;
    @Nullable
    private final Runnable onClose;
    private final int contentWidth;
    private final LinearLayout layout = LinearLayout.vertical();

    PopupScreen(
        Screen p_311716_,
        int p_312972_,
        @Nullable ResourceLocation p_312263_,
        Component p_311243_,
        Component p_313078_,
        List<PopupScreen.ButtonOption> p_312924_,
        @Nullable Runnable p_309530_
    ) {
        super(p_311243_);
        this.backgroundScreen = p_311716_;
        this.image = p_312263_;
        this.message = p_313078_;
        this.buttons = p_312924_;
        this.onClose = p_309530_;
        this.contentWidth = p_312972_ - 36;
    }

    @Override
    public void added() {
        super.added();
        this.backgroundScreen.clearFocus();
    }

    @Override
    protected void init() {
        this.backgroundScreen.init(this.minecraft, this.width, this.height);
        this.layout.spacing(12).defaultCellSetting().alignHorizontallyCenter();
        this.layout
            .addChild(new MultiLineTextWidget(this.title.copy().withStyle(ChatFormatting.BOLD), this.font).setMaxWidth(this.contentWidth).setCentered(true));
        if (this.image != null) {
            this.layout.addChild(ImageWidget.texture(130, 64, this.image, 130, 64));
        }

        this.layout.addChild(new MultiLineTextWidget(this.message, this.font).setMaxWidth(this.contentWidth).setCentered(true));
        this.layout.addChild(this.buildButtonRow());
        this.layout.visitWidgets(p_325330_ -> {
            AbstractWidget abstractwidget = this.addRenderableWidget(p_325330_);
        });
        this.repositionElements();
    }

    private LinearLayout buildButtonRow() {
        int i = 6 * (this.buttons.size() - 1);
        int j = Math.min((this.contentWidth - i) / this.buttons.size(), 150);
        LinearLayout linearlayout = LinearLayout.horizontal();
        linearlayout.spacing(6);

        for (PopupScreen.ButtonOption popupscreen$buttonoption : this.buttons) {
            linearlayout.addChild(
                Button.builder(popupscreen$buttonoption.message(), p_310515_ -> popupscreen$buttonoption.action().accept(this)).width(j).build()
            );
        }

        return linearlayout;
    }

    @Override
    protected void repositionElements() {
        this.backgroundScreen.resize(this.minecraft, this.width, this.height);
        this.layout.arrangeElements();
        FrameLayout.centerInRectangle(this.layout, this.getRectangle());
    }

    @Override
    public void renderBackground(GuiGraphics p_312654_, int p_312824_, int p_310533_, float p_313128_) {
        this.backgroundScreen.render(p_312654_, -1, -1, p_313128_);
        p_312654_.flush();
        RenderSystem.getDevice().createCommandEncoder().clearDepthTexture(this.minecraft.getMainRenderTarget().getDepthTexture(), 1.0);
        this.renderTransparentBackground(p_312654_);
        p_312654_.blitSprite(
            RenderType::guiTextured,
            BACKGROUND_SPRITE,
            this.layout.getX() - 18,
            this.layout.getY() - 18,
            this.layout.getWidth() + 36,
            this.layout.getHeight() + 36
        );
    }

    @Override
    public Component getNarrationMessage() {
        return CommonComponents.joinForNarration(this.title, this.message);
    }

    @Override
    public void onClose() {
        if (this.onClose != null) {
            this.onClose.run();
        }

        this.minecraft.setScreen(this.backgroundScreen);
    }

    @OnlyIn(Dist.CLIENT)
    public static class Builder {
        private final Screen backgroundScreen;
        private final Component title;
        private Component message = CommonComponents.EMPTY;
        private int width = 250;
        @Nullable
        private ResourceLocation image;
        private final List<PopupScreen.ButtonOption> buttons = new ArrayList<>();
        @Nullable
        private Runnable onClose = null;

        public Builder(Screen p_311941_, Component p_309447_) {
            this.backgroundScreen = p_311941_;
            this.title = p_309447_;
        }

        public PopupScreen.Builder setWidth(int p_311856_) {
            this.width = p_311856_;
            return this;
        }

        public PopupScreen.Builder setImage(ResourceLocation p_309878_) {
            this.image = p_309878_;
            return this;
        }

        public PopupScreen.Builder setMessage(Component p_309841_) {
            this.message = p_309841_;
            return this;
        }

        public PopupScreen.Builder addButton(Component p_309455_, Consumer<PopupScreen> p_311142_) {
            this.buttons.add(new PopupScreen.ButtonOption(p_309455_, p_311142_));
            return this;
        }

        public PopupScreen.Builder onClose(Runnable p_311998_) {
            this.onClose = p_311998_;
            return this;
        }

        public PopupScreen build() {
            if (this.buttons.isEmpty()) {
                throw new IllegalStateException("Popup must have at least one button");
            } else {
                return new PopupScreen(
                    this.backgroundScreen, this.width, this.image, this.title, this.message, List.copyOf(this.buttons), this.onClose
                );
            }
        }
    }

    @OnlyIn(Dist.CLIENT)
    record ButtonOption(Component message, Consumer<PopupScreen> action) {
    }
}