src/main/scala/li/cil/oc/client/gui/CustomGuiContainer.scala

package li.cil.oc.client.gui

import net.minecraft.client.gui.inventory.GuiContainer
import java.util
import net.minecraft.client.gui.FontRenderer
import org.lwjgl.opengl.{GL12, GL11}
import net.minecraft.client.renderer.RenderHelper
import scala.collection.convert.WrapAsScala._
import net.minecraft.inventory.Container

// Workaround because certain other mods *cough*TMI*cough* do base class
// transformations that break things! Such fun. Many annoyed. And yes, this
// is a common issue, have a look at EnderIO and Enchanting Plus. They have
// to work around this, too.
abstract class CustomGuiContainer(container: Container) extends GuiContainer(container) {
  // Pretty much Scalaified copy-pasta from base-class.
  override def drawHoveringText(text: util.List[_], x: Int, y: Int, font: FontRenderer) {
    copiedDrawHoveringText(text, x, y, font)
  }

  protected def copiedDrawHoveringText(text: util.List[_], x: Int, y: Int, font: FontRenderer) {
    if (!text.isEmpty) {
      GL11.glDisable(GL12.GL_RESCALE_NORMAL)
      RenderHelper.disableStandardItemLighting()
      GL11.glDisable(GL11.GL_LIGHTING)
      GL11.glDisable(GL11.GL_DEPTH_TEST)

      val textWidth = text.map(line => font.getStringWidth(line.asInstanceOf[String])).max

      var posX = x + 12
      var posY = y - 12
      var textHeight = 8
      if (text.size > 1) {
        textHeight += 2 + (text.size - 1) * 10
      }
      if (posX + textWidth > width) {
        posX -= 28 + textWidth
      }
      if (posY + textHeight + 6 > height) {
        posY = height - textHeight - 6
      }

      zLevel = 300f
      val bg = 0xF0100010
      drawGradientRect(posX - 3, posY - 4, posX + textWidth + 3, posY - 3, bg, bg)
      drawGradientRect(posX - 3, posY + textHeight + 3, posX + textWidth + 3, posY + textHeight + 4, bg, bg)
      drawGradientRect(posX - 3, posY - 3, posX + textWidth + 3, posY + textHeight + 3, bg, bg)
      drawGradientRect(posX - 4, posY - 3, posX - 3, posY + textHeight + 3, bg, bg)
      drawGradientRect(posX + textWidth + 3, posY - 3, posX + textWidth + 4, posY + textHeight + 3, bg, bg)
      val color1 = 0x505000FF
      val color2 = 0x505000FE
      drawGradientRect(posX - 3, posY - 3 + 1, posX - 3 + 1, posY + textHeight + 3 - 1, color1, color2)
      drawGradientRect(posX + textWidth + 2, posY - 3 + 1, posX + textWidth + 3, posY + textHeight + 3 - 1, color1, color2)
      drawGradientRect(posX - 3, posY - 3, posX + textWidth + 3, posY - 3 + 1, color1, color1)
      drawGradientRect(posX - 3, posY + textHeight + 2, posX + textWidth + 3, posY + textHeight + 3, color2, color2)

      for ((line, index) <- text.zipWithIndex) {
        font.drawStringWithShadow(line.asInstanceOf[String], posX, posY, -1)
        if (index == 0) {
          posY += 2
        }
        posY += 10
      }
      zLevel = 0f

      GL11.glEnable(GL11.GL_LIGHTING)
      GL11.glEnable(GL11.GL_DEPTH_TEST)
      RenderHelper.enableStandardItemLighting()
      GL11.glEnable(GL12.GL_RESCALE_NORMAL)
    }
  }
}