Example usage for com.google.gwt.maps.client.event GroundOverlayVisibilityChangedHandler GroundOverlayVisibilityChangedHandler

Introduction

In this page you can find the example usage for com.google.gwt.maps.client.event GroundOverlayVisibilityChangedHandler GroundOverlayVisibilityChangedHandler.

Prototype

GroundOverlayVisibilityChangedHandler

Source Link

Usage

From source file:com.google.gwt.maps.sample.hellomaps.client.GroundOverlayDemo.java

License:Apache License

@Override
public void onShow() {
    // The map's bounds are meaningless until the map has been added to the DOM
    // and sized appropriately
    if (firstTime) {
        firstTime = false;/*from ww  w.  jav  a 2  s  . c  o  m*/
        LatLngBounds bounds = map.getBounds();
        LatLng southWest = bounds.getSouthWest();
        LatLng northEast = bounds.getNorthEast();
        double lngDelta = (northEast.getLongitude() - southWest.getLongitude()) / 4;
        double latDelta = (northEast.getLatitude() - southWest.getLatitude()) / 4;

        // generate bounds that covers center map with half the width and height
        LatLngBounds rectBounds = LatLngBounds.newInstance(
                LatLng.newInstance(southWest.getLatitude() + latDelta, southWest.getLongitude() + lngDelta),
                LatLng.newInstance(northEast.getLatitude() - latDelta, northEast.getLongitude() - lngDelta));
        groundOverlay = new GroundOverlay("boot.jpg", rectBounds);
        groundOverlay.addGroundOverlayVisibilityChangedHandler(new GroundOverlayVisibilityChangedHandler() {

            public void onVisibilityChanged(GroundOverlayVisibilityChangedEvent event) {
                if (event.isVisible()) {
                    hideButton.setText("Hide Overlay");
                } else {
                    hideButton.setText("Show Overlay");
                }
            }

        });
        map.addOverlay(groundOverlay);
    }
}

---