GuiElement.java

package info.jbcs.minecraft.vending.gui.lib.elements;

import info.jbcs.minecraft.vending.gui.lib.IGuiWrapper;
import info.jbcs.minecraft.vending.gui.lib.input.InputKeyboardEvent;
import info.jbcs.minecraft.vending.gui.lib.input.InputMouseEvent;
import org.lwjgl.opengl.GL11;

import java.util.ArrayList;

public abstract class GuiElement {
    public int x;
    public int y;
    public int w;
    public int h;
    public boolean hidden;
    public boolean center;

    public IGuiWrapper gui;
    public GuiElement parent, addedParent;
    private ArrayList<GuiElement> children = null;

    public GuiElement(int x, int y, int w, int h) {
        this.x = x;
        this.y = y;
        this.w = w;
        this.h = h;
        hidden = false;
        center = false;
    }

    public ArrayList<GuiElement> getChildren() {
        return children;
    }

    public GuiElement addChild(GuiElement e) {
        if (children == null) {
            children = new ArrayList<>();
        }

        if (e.parent != null) {
            e.parent.removeChild(e);
        }

        children.add(e);
        e.x += x;
        e.y += y;
        e.parent = this;
        e.gui = gui;
        return e;
    }

    public GuiElement removeChild(GuiElement e) {
        if (children == null) {
            return e;
        }

        children.remove(e);
        e.x -= x;
        e.y -= y;
        e.parent = null;
        e.gui = null;
        return e;
    }

    public void onAdded() {
        if (children == null) {
            return;
        }

        for (GuiElement e : children) {
            if (e.parent != e.addedParent) {
                e.onAdded();
            }

            e.addedParent = e.parent;
        }
    }

    boolean isMouseOver(InputMouseEvent ev) {
        return ev.x >= x && ev.x < x + w && ev.y >= y && ev.y < y + h;
    }

    public void mouseDown(InputMouseEvent ev) {
        if (children == null) {
            return;
        }

        for (GuiElement e : children) {
            e.mouseDown(ev);

            if (ev.handled) {
                return;
            }
        }
    }

    public void mouseUp(InputMouseEvent ev) {
        if (children == null) {
            return;
        }

        for (GuiElement e : children) {
            e.mouseUp(ev);

            if (ev.handled) {
                return;
            }
        }
    }

    public void mouseMove(InputMouseEvent ev) {
        if (children == null) {
            return;
        }

        for (GuiElement e : children) {
            e.mouseMove(ev);

            if (ev.handled) {
                return;
            }
        }
    }

    public void mouseWheel(InputMouseEvent ev) {
        if (children == null) {
            return;
        }

        for (GuiElement e : children) {
            e.mouseWheel(ev);

            if (ev.handled) {
                return;
            }
        }
    }

    public void render() {
        if (children == null || hidden) {
            return;
        }

        for (GuiElement e : children) {
            GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);
            e.render();
        }
    }

    public void keyPressed(InputKeyboardEvent ev) {
        if (children == null) {
            return;
        }

        for (GuiElement e : children) {
            e.keyPressed(ev);

            if (ev.handled) {
                return;
            }
        }
    }

    public abstract int getHeight();

    public abstract int getWidth();
}