CC-Tweaked/src/main/java/dan200/computercraft/client/gui/GuiPrintout.java

/*
 * This file is part of ComputerCraft - http://www.computercraft.info
 * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
 * Send enquiries to dratcliffe@gmail.com
 */
package dan200.computercraft.client.gui;

import com.mojang.blaze3d.systems.RenderSystem;
import dan200.computercraft.core.terminal.TextBuffer;
import dan200.computercraft.shared.common.ContainerHeldItem;
import dan200.computercraft.shared.media.items.ItemPrintout;
import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.screen.inventory.ContainerScreen;
import net.minecraft.client.renderer.IRenderTypeBuffer;
import net.minecraft.client.renderer.Matrix4f;
import net.minecraft.client.renderer.TransformationMatrix;
import net.minecraft.entity.player.PlayerInventory;
import net.minecraft.util.text.ITextComponent;
import org.lwjgl.glfw.GLFW;

import static dan200.computercraft.client.render.PrintoutRenderer.*;

public class GuiPrintout extends ContainerScreen<ContainerHeldItem>
{
    private static final Matrix4f IDENTITY = TransformationMatrix.identity().getMatrix();

    private final boolean m_book;
    private final int m_pages;
    private final TextBuffer[] m_text;
    private final TextBuffer[] m_colours;
    private int m_page;

    public GuiPrintout( ContainerHeldItem container, PlayerInventory player, ITextComponent title )
    {
        super( container, player, title );

        imageHeight = Y_SIZE;

        String[] text = ItemPrintout.getText( container.getStack() );
        m_text = new TextBuffer[text.length];
        for( int i = 0; i < m_text.length; i++ ) m_text[i] = new TextBuffer( text[i] );

        String[] colours = ItemPrintout.getColours( container.getStack() );
        m_colours = new TextBuffer[colours.length];
        for( int i = 0; i < m_colours.length; i++ ) m_colours[i] = new TextBuffer( colours[i] );

        m_page = 0;
        m_pages = Math.max( m_text.length / ItemPrintout.LINES_PER_PAGE, 1 );
        m_book = ((ItemPrintout) container.getStack().getItem()).getType() == ItemPrintout.Type.BOOK;
    }

    @Override
    public boolean keyPressed( int key, int scancode, int modifiers )
    {
        if( super.keyPressed( key, scancode, modifiers ) ) return true;

        if( key == GLFW.GLFW_KEY_RIGHT )
        {
            if( m_page < m_pages - 1 ) m_page++;
            return true;
        }

        if( key == GLFW.GLFW_KEY_LEFT )
        {
            if( m_page > 0 ) m_page--;
            return true;
        }

        return false;
    }

    @Override
    public boolean mouseScrolled( double x, double y, double delta )
    {
        if( super.mouseScrolled( x, y, delta ) ) return true;
        if( delta < 0 )
        {
            // Scroll up goes to the next page
            if( m_page < m_pages - 1 ) m_page++;
            return true;
        }

        if( delta > 0 )
        {
            // Scroll down goes to the previous page
            if( m_page > 0 ) m_page--;
            return true;
        }

        return false;
    }

    @Override
    public void renderBg( float partialTicks, int mouseX, int mouseY )
    {
        // Draw the printout
        RenderSystem.color4f( 1.0f, 1.0f, 1.0f, 1.0f );
        RenderSystem.enableDepthTest();

        IRenderTypeBuffer.Impl renderer = Minecraft.getInstance().renderBuffers().bufferSource();
        drawBorder( IDENTITY, renderer, leftPos, topPos, getBlitOffset(), m_page, m_pages, m_book );
        drawText( IDENTITY, renderer, leftPos + X_TEXT_MARGIN, topPos + Y_TEXT_MARGIN, ItemPrintout.LINES_PER_PAGE * m_page, m_text, m_colours );
        renderer.endBatch();
    }

    @Override
    public void render( int mouseX, int mouseY, float partialTicks )
    {
        // We must take the background further back in order to not overlap with our printed pages.
        setBlitOffset( getBlitOffset() - 1 );
        renderBackground();
        setBlitOffset( getBlitOffset() + 1 );

        super.render( mouseX, mouseY, partialTicks );
        renderTooltip( mouseX, mouseY );
    }
}