ReplayModCinematic/src/main/java/de/johni0702/minecraft/gui/layout/VerticalLayout.java

/*
 * Copyright (c) 2015 johni0702
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package de.johni0702.minecraft.gui.layout;

import com.google.common.collect.Maps;
import de.johni0702.minecraft.gui.container.GuiContainer;
import de.johni0702.minecraft.gui.element.GuiElement;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.Setter;
import lombok.experimental.Accessors;
import org.apache.commons.lang3.tuple.Pair;
import org.lwjgl.util.Dimension;
import org.lwjgl.util.Point;
import org.lwjgl.util.ReadableDimension;
import org.lwjgl.util.ReadablePoint;

import java.util.Map;

public class VerticalLayout implements Layout {
    private static final Data DEFAULT_DATA = new Data(0);

    private final Alignment alignment;

    @Accessors(chain = true)
    @Getter
    @Setter
    private int spacing;

    public VerticalLayout() {
        this(Alignment.TOP);
    }

    public VerticalLayout(Alignment alignment) {
        this.alignment = alignment;
    }

    @Override
    public Map<GuiElement, Pair<ReadablePoint, ReadableDimension>> layOut(GuiContainer<?> container, ReadableDimension size) {
        int y = 0;
        int spacing = 0;
        Map<GuiElement, Pair<ReadablePoint, ReadableDimension>> map = Maps.newHashMap();
        for (Map.Entry<GuiElement, LayoutData> entry : container.getElements().entrySet()) {
            y += spacing;
            spacing = this.spacing;

            GuiElement element  = entry.getKey();
            Data data = entry.getValue() instanceof Data ? (Data) entry.getValue() : DEFAULT_DATA;
            Dimension elementSize = new Dimension(element.getMinSize());
            ReadableDimension elementMaxSize = element.getMaxSize();
            elementSize.setHeight(Math.min(size.getHeight() - y, Math.min(elementSize.getHeight(), elementMaxSize.getHeight())));
            elementSize.setWidth(Math.min(size.getWidth(), element.getMaxSize().getWidth()));
            int remainingWidth = size.getWidth() - elementSize.getWidth();
            int x = (int) (data.alignment * remainingWidth);
            map.put(element, Pair.<ReadablePoint, ReadableDimension>of(new Point(x, y), elementSize));
            y += elementSize.getHeight();
        }
        if (alignment != Alignment.TOP) {
            int remaining = size.getHeight() - y;
            if (alignment == Alignment.CENTER) {
                remaining /= 2;
            }
            for (Pair<ReadablePoint, ReadableDimension> pair : map.values()) {
                ((Point) pair.getLeft()).translate(0, remaining);
            }
        }
        return map;
    }

    @Override
    public ReadableDimension calcMinSize(GuiContainer<?> container) {
        int maxWidth = 0;
        int height = 0;
        int spacing = 0;
        for (Map.Entry<GuiElement, LayoutData> entry : container.getElements().entrySet()) {
            height += spacing;
            spacing = this.spacing;

            GuiElement element = entry.getKey();
            ReadableDimension minSize = element.getMinSize();
            int width = minSize.getWidth();
            if (width > maxWidth) {
                maxWidth = width;
            }
            height += minSize.getHeight();
        }
        return new Dimension(maxWidth, height);
    }

    @lombok.Data
    @AllArgsConstructor
    public static class Data implements LayoutData {
        private double alignment;

        public Data() {
            this(0);
        }
    }

    public enum Alignment {
        TOP, BOTTOM, CENTER
    }
}