/*
* Copyright 2016 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.editor.layers;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import org.terasology.assets.ResourceUrn;
import org.terasology.reflection.metadata.ClassLibrary;
import org.terasology.reflection.metadata.ClassMetadata;
import org.terasology.rendering.nui.CoreScreenLayer;
import org.terasology.rendering.nui.UILayout;
import org.terasology.rendering.nui.UIWidget;
import org.terasology.rendering.nui.WidgetUtil;
import org.terasology.rendering.nui.databinding.ReadOnlyBinding;
import org.terasology.rendering.nui.editor.utils.NUIEditorNodeUtils;
import org.terasology.rendering.nui.widgets.UIButton;
import org.terasology.rendering.nui.widgets.UIDropdownScrollable;
import org.terasology.rendering.nui.widgets.UpdateListener;
import org.terasology.rendering.nui.widgets.treeView.JsonTree;
import org.terasology.rendering.nui.widgets.treeView.JsonTreeValue;
import java.util.Collections;
import java.util.List;
import java.util.Map;
/**
* A screen to select a widget from the list of available widgets
* and add it as a child of a specified {@link JsonTree}.
*/
@SuppressWarnings("unchecked")
public class WidgetSelectionScreen extends CoreScreenLayer {
public static final ResourceUrn ASSET_URI = new ResourceUrn("engine:widgetSelectionScreen");
/**
* The dropdown containing the values of {@code widgets}.
*/
private UIDropdownScrollable<String> availableWidgets;
/**
* The {@link JsonTree} a selected widget is to be added to.
*/
private JsonTree node;
/**
* The list of available UIWidget instances, excluding CoreScreenLayer overrides.
*/
private Map<String, ClassMetadata> widgets = Maps.newHashMap();
/**
* Listeners fired when the screen is closed (without selecting a widget).
*/
private List<UpdateListener> closeListeners = Lists.newArrayList();
@Override
public void initialise() {
availableWidgets = find("availableWidgets", UIDropdownScrollable.class);
// Populate the widget list.
ClassLibrary<UIWidget> metadataLibrary = getManager().getWidgetMetadataLibrary();
for (ClassMetadata metadata : metadataLibrary) {
if (!CoreScreenLayer.class.isAssignableFrom(metadata.getType())) {
widgets.put(metadata.toString(), metadata);
}
}
List<String> options = Lists.newArrayList(widgets.keySet());
Collections.sort(options);
availableWidgets.setOptions(options);
// Add the widget as a child of the node.
WidgetUtil.trySubscribe(this, "ok", button -> {
String selection = availableWidgets.getSelection();
JsonTree childNode;
if (node.getValue().getType() == JsonTreeValue.Type.ARRAY) {
ClassMetadata metadata = widgets.get(selection);
// Get the widget tree from a utility method.
childNode = NUIEditorNodeUtils.createNewWidget(selection, "newWidget", false);
// If the widget is an UILayout override, also add a "contents" array node to the tree.
if (UILayout.class.isAssignableFrom(metadata.getType())) {
childNode.addChild(new JsonTreeValue("contents", null, JsonTreeValue.Type.ARRAY));
}
} else {
childNode = new JsonTree(new JsonTreeValue(selection, null, JsonTreeValue.Type.OBJECT));
childNode.setExpanded(true);
}
node.addChild(childNode);
closeListeners.forEach(UpdateListener::onAction);
getManager().closeScreen(ASSET_URI);
});
find("ok", UIButton.class).bindEnabled(new ReadOnlyBinding<Boolean>() {
@Override
public Boolean get() {
return availableWidgets.getSelection() != null;
}
});
WidgetUtil.trySubscribe(this, "cancel", button -> getManager().closeScreen(ASSET_URI));
}
public void setNode(JsonTree node) {
this.node = node;
}
public void subscribeClose(UpdateListener listener) {
Preconditions.checkNotNull(listener);
closeListeners.add(listener);
}
public void unsubscribeClose(UpdateListener listener) {
Preconditions.checkNotNull(listener);
closeListeners.remove(listener);
}
}