Code/net/minecraft/client/gui/components/spectator/SpectatorGui.java

package net.minecraft.client.gui.components.spectator;

import javax.annotation.Nullable;
import net.minecraft.Util;
import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.GuiGraphics;
import net.minecraft.client.gui.spectator.SpectatorMenu;
import net.minecraft.client.gui.spectator.SpectatorMenuItem;
import net.minecraft.client.gui.spectator.SpectatorMenuListener;
import net.minecraft.client.gui.spectator.categories.SpectatorPage;
import net.minecraft.client.renderer.RenderType;
import net.minecraft.network.chat.Component;
import net.minecraft.resources.ResourceLocation;
import net.minecraft.util.ARGB;
import net.minecraft.util.Mth;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.api.distmarker.OnlyIn;

@OnlyIn(Dist.CLIENT)
public class SpectatorGui implements SpectatorMenuListener {
    private static final ResourceLocation HOTBAR_SPRITE = ResourceLocation.withDefaultNamespace("hud/hotbar");
    private static final ResourceLocation HOTBAR_SELECTION_SPRITE = ResourceLocation.withDefaultNamespace("hud/hotbar_selection");
    private static final long FADE_OUT_DELAY = 5000L;
    private static final long FADE_OUT_TIME = 2000L;
    private final Minecraft minecraft;
    private long lastSelectionTime;
    @Nullable
    private SpectatorMenu menu;

    public SpectatorGui(Minecraft p_94767_) {
        this.minecraft = p_94767_;
    }

    public void onHotbarSelected(int p_94772_) {
        this.lastSelectionTime = Util.getMillis();
        if (this.menu != null) {
            this.menu.selectSlot(p_94772_);
        } else {
            this.menu = new SpectatorMenu(this);
        }
    }

    private float getHotbarAlpha() {
        long i = this.lastSelectionTime - Util.getMillis() + 5000L;
        return Mth.clamp((float)i / 2000.0F, 0.0F, 1.0F);
    }

    public void renderHotbar(GuiGraphics p_281458_) {
        if (this.menu != null) {
            float f = this.getHotbarAlpha();
            if (f <= 0.0F) {
                this.menu.exit();
            } else {
                int i = p_281458_.guiWidth() / 2;
                p_281458_.pose().pushPose();
                p_281458_.pose().translate(0.0F, 0.0F, -90.0F);
                int j = Mth.floor(p_281458_.guiHeight() - 22.0F * f);
                SpectatorPage spectatorpage = this.menu.getCurrentPage();
                this.renderPage(p_281458_, f, i, j, spectatorpage);
                p_281458_.pose().popPose();
            }
        }
    }

    protected void renderPage(GuiGraphics p_282945_, float p_281688_, int p_281726_, int p_281730_, SpectatorPage p_282361_) {
        int i = ARGB.white(p_281688_);
        p_282945_.blitSprite(RenderType::guiTextured, HOTBAR_SPRITE, p_281726_ - 91, p_281730_, 182, 22, i);
        if (p_282361_.getSelectedSlot() >= 0) {
            p_282945_.blitSprite(RenderType::guiTextured, HOTBAR_SELECTION_SPRITE, p_281726_ - 91 - 1 + p_282361_.getSelectedSlot() * 20, p_281730_ - 1, 24, 23, i);
        }

        for (int j = 0; j < 9; j++) {
            this.renderSlot(p_282945_, j, p_282945_.guiWidth() / 2 - 90 + j * 20 + 2, p_281730_ + 3, p_281688_, p_282361_.getItem(j));
        }
    }

    private void renderSlot(GuiGraphics p_281411_, int p_283536_, int p_281853_, float p_282693_, float p_281955_, SpectatorMenuItem p_283370_) {
        if (p_283370_ != SpectatorMenu.EMPTY_SLOT) {
            p_281411_.pose().pushPose();
            p_281411_.pose().translate(p_281853_, p_282693_, 0.0F);
            float f = p_283370_.isEnabled() ? 1.0F : 0.25F;
            p_283370_.renderIcon(p_281411_, f, p_281955_);
            p_281411_.pose().popPose();
            int i = (int)(p_281955_ * 255.0F);
            if (i > 3 && p_283370_.isEnabled()) {
                Component component = this.minecraft.options.keyHotbarSlots[p_283536_].getTranslatedKeyMessage();
                p_281411_.drawString(
                    this.minecraft.font,
                    component,
                    p_281853_ + 19 - 2 - this.minecraft.font.width(component),
                    (int)p_282693_ + 6 + 3,
                    16777215 + (i << 24)
                );
            }
        }
    }

    public void renderTooltip(GuiGraphics p_283107_) {
        int i = (int)(this.getHotbarAlpha() * 255.0F);
        if (i > 3 && this.menu != null) {
            SpectatorMenuItem spectatormenuitem = this.menu.getSelectedItem();
            Component component = spectatormenuitem == SpectatorMenu.EMPTY_SLOT ? this.menu.getSelectedCategory().getPrompt() : spectatormenuitem.getName();
            if (component != null) {
                int j = this.minecraft.font.width(component);
                int k = (p_283107_.guiWidth() - j) / 2;
                int l = p_283107_.guiHeight() - 35;
                p_283107_.drawStringWithBackdrop(this.minecraft.font, component, k, l, j, ARGB.color(i, -1));
            }
        }
    }

    @Override
    public void onSpectatorMenuClosed(SpectatorMenu p_94792_) {
        this.menu = null;
        this.lastSelectionTime = 0L;
    }

    public boolean isMenuActive() {
        return this.menu != null;
    }

    public void onMouseScrolled(int p_205381_) {
        int i = this.menu.getSelectedSlot() + p_205381_;

        while (i >= 0 && i <= 8 && (this.menu.getItem(i) == SpectatorMenu.EMPTY_SLOT || !this.menu.getItem(i).isEnabled())) {
            i += p_205381_;
        }

        if (i >= 0 && i <= 8) {
            this.menu.selectSlot(i);
            this.lastSelectionTime = Util.getMillis();
        }
    }

    public void onMouseMiddleClick() {
        this.lastSelectionTime = Util.getMillis();
        if (this.isMenuActive()) {
            int i = this.menu.getSelectedSlot();
            if (i != -1) {
                this.menu.selectSlot(i);
            }
        } else {
            this.menu = new SpectatorMenu(this);
        }
    }
}