GuiImageButton.java

/**
 * Copyright (c) 2011-2015, SpaceToad and the BuildCraft Team
 * http://www.mod-buildcraft.com
 *
 * BuildCraft is distributed under the terms of the Minecraft Mod Public
 * License 1.0, or MMPL. Please check the contents of the license located in
 * http://www.mod-buildcraft.com/MMPL-1.0.txt
 */

package buildcraft.core.lib.gui.buttons;

import java.util.ArrayList;

import org.lwjgl.opengl.GL11;

import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.GuiButton;
import net.minecraft.util.ResourceLocation;

import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;

import buildcraft.core.DefaultProps;


@SideOnly(Side.CLIENT)
public class GuiImageButton extends GuiButton implements IButtonClickEventTrigger {

	public enum ButtonImage {
		BLANK(1, 19),
		WHITE_LIST(19, 19),
		BLACK_LIST(37, 19),
		ROUND_ROBIN(55, 19);

		private final int u, v;

		ButtonImage(int u, int v) {
			this.u = u;
			this.v = v;
		}

		public int getU() {
			return u;
		}

		public int getV() {
			return v;
		}
	}

	public static final ResourceLocation ICON_BUTTON_TEXTURES = new ResourceLocation("buildcraftcore:textures/gui/icon_button.png");

	public static final int SIZE = 18;

	private ArrayList<IButtonClickEventListener> listeners = new ArrayList<IButtonClickEventListener>();
	private ButtonImage image = ButtonImage.BLANK;
	private boolean active = false;

	public GuiImageButton(int id, int x, int y, ButtonImage image) {
		super(id, x, y, SIZE, SIZE, "");

		this.image = image;
	}

	public boolean isActive() {
		return active;
	}

	public void activate() {
		active = true;
	}

	public void deActivate() {
		active = false;
	}

	@Override
	public void drawButton(Minecraft minecraft, int x, int y) {

		if (!visible) {
			return;
		}

		minecraft.renderEngine.bindTexture(ICON_BUTTON_TEXTURES);

		GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);

		int buttonState = getButtonState(x, y);

		drawTexturedModalRect(xPosition, yPosition, buttonState * SIZE, 0, SIZE, SIZE);

		drawTexturedModalRect(xPosition + 1, yPosition + 1, image.getU(), image.getV(), SIZE - 2, SIZE - 2);

		mouseDragged(minecraft, x, y);
	}

	@Override
	public boolean mousePressed(Minecraft par1Minecraft, int par2, int par3) {
		boolean pressed = super.mousePressed(par1Minecraft, par2, par3);

		if (pressed) {
			active = !active;
			notifyAllListeners();
		}

		return pressed;
	}

	@Override
	public void registerListener(IButtonClickEventListener listener) {
		listeners.add(listener);
	}

	@Override
	public void removeListener(IButtonClickEventListener listener) {
		listeners.remove(listener);
	}

	@Override
	public void notifyAllListeners() {
		for (IButtonClickEventListener listener : listeners) {
			listener.handleButtonClick(this, this.id);
		}
    }

	private int getButtonState(int mouseX, int mouseY) {
		if (!this.enabled) {
			return 0;
		}

		if (isMouseOverButton(mouseX, mouseY)) {
			if (!this.active) {
				return 2;
			} else {
				return 4;
			}
		}

        if (!this.active) {
            return 1;
        } else {
            return 3;
        }
	}

	private boolean isMouseOverButton(int mouseX, int mouseY) {
		return mouseX >= xPosition && mouseY >= yPosition && mouseX < xPosition + SIZE && mouseY < yPosition + SIZE;
	}
}