/*
* 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.relative;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.terasology.math.geom.Rect2i;
import org.terasology.math.geom.Vector2i;
import org.terasology.rendering.nui.Canvas;
import org.terasology.rendering.nui.CoreLayout;
import org.terasology.rendering.nui.HorizontalAlign;
import org.terasology.rendering.nui.UIWidget;
import org.terasology.rendering.nui.VerticalAlign;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
/**
*/
public class RelativeLayout extends CoreLayout<RelativeLayoutHint> {
private static final Logger logger = LoggerFactory.getLogger(RelativeLayout.class);
private Map<String, WidgetInfo> contentLookup = Maps.newHashMap();
private List<WidgetInfo> contents = Lists.newArrayList();
private Map<WidgetInfo, Rect2i> cachedRegions = Maps.newHashMap();
private String loopDetectionId = "";
@Override
public void addWidget(UIWidget widget, RelativeLayoutHint hint) {
if (widget != null && hint != null) {
WidgetInfo info = new WidgetInfo(widget, hint);
contents.add(info);
if (!widget.getId().isEmpty()) {
contentLookup.put(widget.getId(), info);
}
} else if (widget != null) {
logger.error("Attempted to add widget '{}' of type '{}' with no layout hint", widget.getId(), widget.getClass().getSimpleName());
}
}
@Override
public void removeWidget(UIWidget widget) {
String id = widget.getId();
WidgetInfo info = contentLookup.get(id);
contentLookup.remove(id);
contents.remove(info);
cachedRegions.remove(info);
}
public void addWidget(UIWidget widget, HorizontalHint horizontal, VerticalHint vertical) {
addWidget(widget, new RelativeLayoutHint(horizontal, vertical));
}
@Override
public void onDraw(Canvas canvas) {
for (WidgetInfo element : contents) {
Rect2i drawRegion = getRegion(element, canvas);
canvas.drawWidget(element.widget, drawRegion);
}
cachedRegions.clear();
}
private Rect2i getRegion(WidgetInfo element, Canvas canvas) {
Rect2i cachedRegion = cachedRegions.get(element);
if (cachedRegion != null) {
return cachedRegion;
}
int left = 0;
int right = canvas.size().x;
int center = canvas.size().x / 2;
if (element.layoutHint.getPositionCenterHorizontal() != null) {
HorizontalInfo info = element.layoutHint.getPositionCenterHorizontal();
Rect2i targetRegion = getTargetRegion(info.getWidget(), canvas);
HorizontalAlign align = (info.getTarget() != null) ? info.getTarget() : HorizontalAlign.CENTER;
center = align.getStart(targetRegion) + info.getOffset();
}
if (element.layoutHint.getPositionLeft() != null) {
HorizontalInfo info = element.layoutHint.getPositionLeft();
Rect2i targetRegion = getTargetRegion(info.getWidget(), canvas);
HorizontalAlign align = (info.getTarget() != null) ? info.getTarget() : HorizontalAlign.LEFT;
left = align.getStart(targetRegion) + info.getOffset();
}
if (element.layoutHint.getPositionRight() != null) {
HorizontalInfo info = element.layoutHint.getPositionRight();
Rect2i targetRegion = getTargetRegion(info.getWidget(), canvas);
HorizontalAlign align = (info.getTarget() != null) ? info.getTarget() : HorizontalAlign.RIGHT;
right = align.getStart(targetRegion) - info.getOffset();
}
int top = 0;
int bottom = canvas.size().y;
int vcenter = canvas.size().y / 2;
if (element.layoutHint.getPositionCenterVertical() != null) {
VerticalInfo info = element.layoutHint.getPositionCenterVertical();
Rect2i targetRegion = getTargetRegion(info.getWidget(), canvas);
VerticalAlign align = (info.getTarget() != null) ? info.getTarget() : VerticalAlign.MIDDLE;
vcenter = align.getStart(targetRegion) + info.getOffset();
}
if (element.layoutHint.getPositionTop() != null) {
VerticalInfo info = element.layoutHint.getPositionTop();
Rect2i targetRegion = getTargetRegion(info.getWidget(), canvas);
VerticalAlign align = (info.getTarget() != null) ? info.getTarget() : VerticalAlign.TOP;
top = align.getStart(targetRegion) + info.getOffset();
}
if (element.layoutHint.getPositionBottom() != null) {
VerticalInfo info = element.layoutHint.getPositionBottom();
Rect2i targetRegion = getTargetRegion(info.getWidget(), canvas);
VerticalAlign align = (info.getTarget() != null) ? info.getTarget() : VerticalAlign.BOTTOM;
bottom = align.getStart(targetRegion) - info.getOffset();
}
int width = element.layoutHint.getWidth();
if (width == 0 && element.layoutHint.isUsingContentWidth()) {
width = canvas.calculateRestrictedSize(element.widget, new Vector2i(right - left, bottom - top)).x;
}
if (width == 0) {
width = right - left;
} else {
if (element.layoutHint.getPositionCenterHorizontal() != null) {
left = center - width / 2;
} else if (element.layoutHint.getPositionRight() != null) {
if (element.layoutHint.getPositionLeft() != null) {
center = left + (right - left) / 2;
left = center - width / 2;
} else {
left = right - width;
}
}
}
int height = element.layoutHint.getHeight();
if (height == 0 && element.layoutHint.isUsingContentHeight()) {
height = canvas.calculateRestrictedSize(element.widget, new Vector2i(width, bottom - top)).y;
}
if (height == 0) {
height = bottom - top;
} else {
if (element.layoutHint.getPositionCenterVertical() != null) {
top = vcenter - height / 2;
} else if (element.layoutHint.getPositionBottom() != null) {
if (element.layoutHint.getPositionTop() != null) {
vcenter = top + (bottom - top) / 2;
top = vcenter - height / 2;
} else {
top = bottom - height;
}
}
}
Rect2i region = Rect2i.createFromMinAndSize(left, top, width, height);
cachedRegions.put(element, region);
return region;
}
private Rect2i getTargetRegion(String id, Canvas canvas) {
if (id != null && !id.isEmpty()) {
if (loopDetectionId.equals(id)) {
logger.warn("Infinite loop detected resolving layout of element {}", loopDetectionId);
loopDetectionId = "";
return canvas.getRegion();
} else if (loopDetectionId.isEmpty()) {
loopDetectionId = id;
}
WidgetInfo target = contentLookup.get(id);
if (target != null) {
Rect2i region = getRegion(target, canvas);
loopDetectionId = "";
return region;
}
}
loopDetectionId = "";
return canvas.getRegion();
}
@Override
public Vector2i getPreferredContentSize(Canvas canvas, Vector2i sizeHint) {
return new Vector2i();
}
@Override
public Vector2i getMaxContentSize(Canvas canvas) {
return new Vector2i(Integer.MAX_VALUE, Integer.MAX_VALUE);
}
@Override
public Iterator<UIWidget> iterator() {
List<UIWidget> widgets = Lists.newArrayListWithCapacity(contents.size());
widgets.addAll(contents.stream().map(info -> info.widget).collect(Collectors.toList()));
return widgets.iterator();
}
private static final class WidgetInfo {
private UIWidget widget;
private RelativeLayoutHint layoutHint;
private WidgetInfo(UIWidget widget, RelativeLayoutHint layoutHint) {
this.widget = widget;
this.layoutHint = layoutHint;
}
}
}