SpurtScroll

package svk.industrialTech.gui;

import org.lwjgl.input.Mouse;

import svk.industrialTech.utils.RenderHelper;
import net.minecraft.client.Minecraft;
import net.minecraft.util.ResourceLocation;

public class SpurtScroll
{
    public final ResourceLocation texture = new ResourceLocation("minecraft:textures/gui/container/creative_inventory/tabs.png");
    int posX, posY, sizeY, amountSteps, step;

    public SpurtScroll(int posX, int posY, int sizeY, int amountSteps)
    {
        this.posX = posX;
        this.posY = posY;
        this.sizeY = sizeY;
        this.amountSteps = amountSteps;
    }

    public void draw()
    {
        Minecraft.getMinecraft().getTextureManager().bindTexture(texture);

        if(amountSteps == 0)
        {
            RenderHelper.drawTextureCustomSize(posX, posY, 232+12, 0, 12, 15, 256, 256);
        }
        else
        {
            float percent = ((float) step/amountSteps);
            if(step == 0) RenderHelper.drawTextureCustomSize(posX, posY, 232, 0, 12, 15, 256, 256);
            else if(step < amountSteps) RenderHelper.drawTextureCustomSize(posX, posY + sizeY * percent - 15*percent, 232, 0, 12, 15, 256, 256);
            else if(step == amountSteps) RenderHelper.drawTextureCustomSize(posX, posY + sizeY * percent - 15, 232, 0, 12, 15, 256, 256);
        }
    }

    public void mouseClickMove(int x, int y, int key, long time)
    {
        if(x >= posX && y >= posY && x <= posX+12 && y <= posY+sizeY)
        {
            float percent = (float) (y - posY)/sizeY;
            float stepSize = 1.0F/(amountSteps+1);
            this.step = (int) (percent/stepSize);
        }
    }

    public void handleMouseInput(int x, int y)
    {
        if(x >= posX && y >= posY && x <= posX+12 && y <= posY+sizeY)
        {
            int scrollType = Mouse.getEventDWheel();
            if(scrollType < 0) //Back
            {
                this.scrollDown();
            }
            else if(scrollType > 0)//Back to the future
            {
                this.scrollUp();
            }
        }
    }

    public void scrollUp()
    {
        this.step = this.step > 0 ? this.step -= 1 : this.step;
    }

    public void scrollDown()
    {
        this.step = this.step < amountSteps ? this.step += 1 : this.step;
    }
}