org.vaadin.addon.leaflet.client.LeafletLayerGroupConnector.java Source code

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Here is the source code for org.vaadin.addon.leaflet.client.LeafletLayerGroupConnector.java

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/*
 * Copyright 2012 Vaadin Community.
 *
 * 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.vaadin.addon.leaflet.client;

import org.vaadin.addon.leaflet.shared.LeafletLayerGroupState;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.peimari.gleaflet.client.Layer;
import org.peimari.gleaflet.client.LayerGroup;
import org.vaadin.addon.leaflet.LLayerGroup;

import com.google.gwt.event.shared.HandlerRegistration;
import com.vaadin.client.ComponentConnector;
import com.vaadin.client.ConnectorHierarchyChangeEvent;
import com.vaadin.client.ConnectorHierarchyChangeEvent.ConnectorHierarchyChangeHandler;
import com.vaadin.client.communication.StateChangeEvent;
import com.vaadin.client.HasComponentsConnector;
import com.vaadin.client.ServerConnector;
import com.vaadin.shared.ui.Connect;

/**
 * 
 * @author mattitahvonenitmill
 */
@Connect(LLayerGroup.class)
public class LeafletLayerGroupConnector extends AbstractLeafletLayerConnector<Object>
        implements HasComponentsConnector, ConnectorHierarchyChangeHandler {

    private LayerGroup layerGroup;

    List<ComponentConnector> childComponents;

    private ArrayList<ComponentConnector> orphaned;

    public LeafletLayerGroupConnector() {
        super();
    }

    @Override
    public void updateCaption(ComponentConnector connector) {
        // skipped
    }

    @Override
    public LeafletLayerGroupState getState() {
        return (LeafletLayerGroupState) super.getState();
    }

    @Override
    public void onStateChanged(StateChangeEvent stateChangeEvent) {
        // NOP
    }

    @Override
    public void onConnectorHierarchyChange(ConnectorHierarchyChangeEvent connectorHierarchyChangeEvent) {
    }

    @Override
    public void update() {

        if (layerGroup == null) {
            layerGroup = createLayerGroup();
            addToParent(layerGroup);
        }
        updateChildren();

    }

    protected LayerGroup createLayerGroup() {
        return LayerGroup.create();
    }

    private void updateChildren() {
        for (ServerConnector serverConnector : getChildComponents()) {
            AbstractLeafletLayerConnector<?> c = (AbstractLeafletLayerConnector<?>) serverConnector;
            c.updateIfDirty();
        }
        if (orphaned != null) {
            for (ComponentConnector c : orphaned) {
                AbstractLeafletLayerConnector<?> lc = (AbstractLeafletLayerConnector<?>) c;
                lc.removeLayerFromParent();
            }
        }
    }

    @Override
    public List<ComponentConnector> getChildComponents() {
        if (childComponents == null) {
            return Collections.emptyList();
        }

        return childComponents;
    }

    @Override
    public void setChildComponents(List<ComponentConnector> childComponents) {
        // Firing hierarchy changes events seems to be buggy in V7 :-(
        // As a workaround do the things here
        orphaned = new ArrayList<ComponentConnector>(getChildComponents());
        this.childComponents = childComponents;
        for (ServerConnector componentConnector : childComponents) {
            orphaned.remove(componentConnector);
        }
        markDirty();
        deferUpdate();
    }

    @Override
    public HandlerRegistration addConnectorHierarchyChangeHandler(ConnectorHierarchyChangeHandler handler) {
        return ensureHandlerManager().addHandler(ConnectorHierarchyChangeEvent.TYPE, handler);
    }

    @Override
    protected Object createOptions() {
        return null;
    }

    @Override
    public Layer getLayer() {
        return layerGroup;
    }

}