/*
* Copyright 2014 MovingBlocks
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.terasology.rendering.nui.layouts;
import com.google.common.collect.Lists;
import org.terasology.math.Rect2i;
import org.terasology.math.Vector2i;
import org.terasology.rendering.nui.Canvas;
import org.terasology.rendering.nui.CoreLayout;
import org.terasology.rendering.nui.LayoutHint;
import org.terasology.rendering.nui.UIWidget;
import java.util.Iterator;
import java.util.List;
/**
* @author Immortius
*/
public class FlowLayout extends CoreLayout<LayoutHint> {
private List<UIWidget> contents = Lists.newArrayList();
@Override
public void addWidget(UIWidget element, LayoutHint hint) {
contents.add(element);
}
@Override
public void onDraw(Canvas canvas) {
int filledWidth = 0;
int filledHeight = 0;
int heightOffset = 0;
for (UIWidget widget : contents) {
Vector2i size = canvas.calculatePreferredSize(widget);
if (filledWidth != 0 && filledWidth + size.x > canvas.size().x) {
heightOffset += filledHeight;
filledWidth = 0;
filledHeight = 0;
}
canvas.drawWidget(widget, Rect2i.createFromMinAndSize(filledWidth, heightOffset, size.x, size.y));
filledWidth += size.x;
filledHeight = Math.max(filledHeight, size.y);
}
}
@Override
public Vector2i getPreferredContentSize(Canvas canvas, Vector2i sizeHint) {
Vector2i result = new Vector2i();
int filledWidth = 0;
int filledHeight = 0;
for (UIWidget widget : contents) {
Vector2i size = canvas.calculatePreferredSize(widget);
if (filledWidth != 0 && filledWidth + size.x > sizeHint.x) {
result.x = Math.max(result.x, filledWidth);
result.y += filledHeight;
filledWidth = size.x;
filledHeight = size.y;
} else {
filledWidth += size.x;
filledHeight = Math.max(filledHeight, size.y);
}
}
result.x = Math.max(result.x, filledWidth);
result.y += filledHeight;
return result;
}
@Override
public Vector2i getMaxContentSize(Canvas canvas) {
return new Vector2i(Integer.MAX_VALUE, Integer.MAX_VALUE);
}
@Override
public Iterator<UIWidget> iterator() {
return contents.iterator();
}
}