/*
* This is part of Geomajas, a GIS framework, http://www.geomajas.org/.
*
* Copyright 2008-2011 Geosparc nv, http://www.geosparc.com/, Belgium.
*
* The program is available in open source according to the GNU Affero
* General Public License. All contributions in this program are covered
* by the Geomajas Contributors License Agreement. For full licensing
* details, see LICENSE.txt in the project root.
*/
package org.geomajas.puregwt.client.layer;
import org.geomajas.puregwt.client.ContentPanel;
import org.geomajas.puregwt.client.map.MapPresenter;
import org.geomajas.puregwt.client.map.event.LayerHideEvent;
import org.geomajas.puregwt.client.map.event.LayerShowEvent;
import org.geomajas.puregwt.client.map.event.LayerVisibilityHandler;
import org.geomajas.puregwt.client.map.event.LayerVisibilityMarkedEvent;
import org.geomajas.puregwt.client.map.event.MapInitializationEvent;
import org.geomajas.puregwt.client.map.event.MapInitializationHandler;
import org.geomajas.puregwt.client.map.layer.Layer;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.user.client.ui.CheckBox;
import com.google.gwt.user.client.ui.DecoratorPanel;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;
/**
* ContentPanel that demonstrates layer visibility.
*
* @author Pieter De Graef
*/
public class LayerVisibilityPanel extends ContentPanel {
private MapPresenter mapPresenter;
private VerticalPanel layerCheckBoxLayout;
private VerticalPanel layerEventLayout;
public String getTitle() {
return "Layer Visibility";
}
public String getDescription() {
return "This example shows the events that accompany the toggling of a layer's visibility.<br/>Note that the" +
" 'countries' layer has been configured to be visible only on medium scale lavels. When zooming too" +
" far in or out, the countries layer will never be visible.";
}
public Widget getContentWidget() {
// Define the left layout:
VerticalPanel leftLayout = new VerticalPanel();
leftLayout.setSize("220px", "100%");
leftLayout.add(new HTML("<h3>Layers:</h3>"));
layerCheckBoxLayout = new VerticalPanel();
leftLayout.add(layerCheckBoxLayout);
leftLayout.add(new HTML("<h3>Events:</h3>"));
layerEventLayout = new VerticalPanel();
leftLayout.add(layerEventLayout);
// Create the MapPresenter and add an InitializationHandler:
mapPresenter = getInjector().getMapPresenter();
mapPresenter.setSize(640, 480);
mapPresenter.getEventBus().addHandler(MapInitializationEvent.TYPE, new MyMapInitializationHandler());
mapPresenter.getEventBus().addHandler(MyLayerVisibilityHandler.TYPE, new MyLayerVisibilityHandler());
// Define the whole layout:
HorizontalPanel layout = new HorizontalPanel();
layout.add(leftLayout);
DecoratorPanel mapDecorator = new DecoratorPanel();
mapDecorator.add(mapPresenter.asWidget());
layout.add(mapDecorator);
// Initialize the map, and return the layout:
mapPresenter.initialize("pure-gwt-app", "mapLayerVisibility");
return layout;
}
/**
* Map initialization handler that adds a CheckBox to the layout for every layer. With these CheckBoxes, the user
* can toggle the layer's visibility.
*
* @author Pieter De Graef
*/
private class MyMapInitializationHandler implements MapInitializationHandler {
public void onMapInitialized(MapInitializationEvent event) {
// When the map initializes: add a CheckBox for every layer, so the use can toggle visibility:
for (int i = 0; i < mapPresenter.getLayersModel().getLayerCount(); i++) {
final Layer<?> layer = mapPresenter.getLayersModel().getLayer(i);
CheckBox layerCheck = new CheckBox(layer.getTitle());
layerCheck.setValue(layer.isMarkedAsVisible());
// When CheckBox value changes, change the layer's visibility as well:
layerCheck.addValueChangeHandler(new ValueChangeHandler<Boolean>() {
public void onValueChange(ValueChangeEvent<Boolean> event) {
if (event.getValue() != null) {
layer.setMarkedAsVisible(event.getValue());
}
}
});
layerCheckBoxLayout.add(layerCheck);
}
}
}
/**
* Handler that catches layer visibility events and prints them out.
*
* @author Pieter De Graef
*/
private class MyLayerVisibilityHandler implements LayerVisibilityHandler {
public void onShow(LayerShowEvent event) {
layerEventLayout.add(new Label("onShow: " + event.getLayer().getTitle()));
}
public void onHide(LayerHideEvent event) {
layerEventLayout.add(new Label("onHide: " + event.getLayer().getTitle()));
}
public void onVisibilityMarked(LayerVisibilityMarkedEvent event) {
layerEventLayout.add(new Label("onVisibilityMarked: " + event.getLayer().getTitle()));
}
}
}