Package eu.webtoolkit.jwt

Class WLeafletMap

java.lang.Object

eu.webtoolkit.jwt.WObject

eu.webtoolkit.jwt.WWidget

eu.webtoolkit.jwt.WCompositeWidget

eu.webtoolkit.jwt.WLeafletMap

public class WLeafletMap
extends WCompositeWidget

A widget that displays a leaflet map.

This is a simple wrapper around the Leaflet JavaScript library.

Leaflet itself does not provide maps. It is a JavaScript library that enables you to use any "tile server", like OpenStreetMap. If you just create a WLeafletMap (and give it a size), then you will be presented with an empty map. You can then add tile layers to the map using addTileLayer().

WLeafletMap is not exhaustive in its support for Leaflet features. It supports a subset out of the box. One of these features is markers, which come in two flavors: standard leaflet markers (WLeafletMap.LeafletMarker) and widget markers (WLeafletMap.WidgetMarker). Using a widget marker, you can place arbitrary widgets on the map.

If you need direct access to the leaflet map in your own custom JavaScript, you can use getMapJsRef().

Leaflet itself is not bundled with JWt. Use the leafletJSURL and leafletCSSURL properties to configure where the JavaScript and CSS of Leaflet should be loaded from.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	WLeafletMap.Coordinate	A geographical coordinate (latitude/longitude)
static class	WLeafletMap.LeafletMarker	A standard leaflet marker.
static class	WLeafletMap.Marker	An abstract marker.
static class	WLeafletMap.WidgetMarker	A marker rendered with a widget.

Nested classes/interfaces inherited from class eu.webtoolkit.jwt.WObject

WObject.FormData

Constructor Summary

Constructors

Constructor	Description
WLeafletMap()	Create a new WLeafletMap.
WLeafletMap(com.google.gson.JsonObject options)	Create a new WLeafletMap with the given options.
WLeafletMap(com.google.gson.JsonObject options, WContainerWidget parentContainer)	Create a new WLeafletMap with the given options.
WLeafletMap(WContainerWidget parentContainer)	Create a new WLeafletMap.

Method Summary

Modifier and Type	Method	Description
void	addCircle(WLeafletMap.Coordinate center, double radius, WPen stroke, WBrush fill)	Add a circle.
void	addMarker(WLeafletMap.Marker marker)	Add the given marker.
void	addPolyline(List<WLeafletMap.Coordinate> points, WPen pen)	Add a polyline.
void	addTileLayer(String urlTemplate, com.google.gson.JsonObject options)	Add a new tile layer.
String	getMapJsRef()	Returns a JavaScript expression to the Leaflet map object.
WLeafletMap.Coordinate	getPosition()	Get the current position.
int	getZoomLevel()	Get the current zoom level.
JSignal2<Double,Double>	panChanged()	Signal emitted when the user has panned the map.
void	panTo(WLeafletMap.Coordinate center)	Pan to the given coordinate.
void	remove()	Destructor.
WLeafletMap.Marker	removeMarker(WLeafletMap.Marker marker)	Remove the given marker.
protected void	render(EnumSet<RenderFlag> flags)	Renders the widget.
void	setOptions(com.google.gson.JsonObject options)	Change the options of the WLeafletMap.
void	setZoomLevel(int level)	Set the current zoom level.
JSignal1<Integer>	zoomLevelChanged()	Signal emitted when the user has changed the zoom level of the map.

Methods inherited from class eu.webtoolkit.jwt.WCompositeWidget

addStyleClass, boxBorder, boxPadding, callJavaScriptMember, doJavaScript, enableAjax, find, findById, getAttributeValue, getBaseZIndex, getChildren, getClearSides, getDecorationStyle, getFloatSide, getHeight, getId, getImplementation, getJavaScriptMember, getLineHeight, getMargin, getMaximumHeight, getMaximumWidth, getMinimumHeight, getMinimumWidth, getObjectName, getOffset, getPositionScheme, getScrollVisibilityMargin, getStyleClass, getTabIndex, getTakeImplementation, getToolTip, getVerticalAlignment, getVerticalAlignmentLength, getWidth, hasFocus, hasStyleClass, isCanReceiveFocus, isDisabled, isEnabled, isHidden, isHiddenKeepsGeometry, isInline, isLoaded, isPopup, isScrollVisibilityEnabled, isScrollVisible, isSetFirstFocus, isThemeStyleEnabled, isVisible, load, propagateSetEnabled, propagateSetVisible, refresh, removeStyleClass, removeWidget, resize, scrollVisibilityChanged, setAttributeValue, setCanReceiveFocus, setClearSides, setDecorationStyle, setDeferredToolTip, setDisabled, setFloatSide, setFocus, setHidden, setHiddenKeepsGeometry, setId, setImplementation, setInline, setJavaScriptMember, setLineHeight, setMargin, setMaximumSize, setMinimumSize, setObjectName, setOffsets, setPopup, setPositionScheme, setScrollVisibilityEnabled, setScrollVisibilityMargin, setSelectable, setStyleClass, setTabIndex, setThemeStyleEnabled, setToolTip, setVerticalAlignment

Methods inherited from class eu.webtoolkit.jwt.WWidget

acceptDrops, acceptDrops, addCssRule, addCssRule, addJSignal, addStyleClass, animateHide, animateShow, createJavaScript, disable, dropEvent, enable, getDropTouch, getJsRef, getParent, hide, htmlText, isExposed, isGlobalWidget, isLayoutSizeAware, isRendered, layoutSizeChanged, needsRerender, positionAt, positionAt, removeFromParent, removeStyleClass, render, resize, scheduleRender, scheduleRender, scheduleRender, setClearSides, setDeferredToolTip, setFocus, setHeight, setHidden, setLayoutSizeAware, setMargin, setMargin, setMargin, setMargin, setMargin, setOffsets, setOffsets, setOffsets, setOffsets, setOffsets, setToolTip, setVerticalAlignment, setWidth, show, stopAcceptDrops, toggleStyleClass, toggleStyleClass, tr

Methods inherited from class eu.webtoolkit.jwt.WObject

setFormData

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

WLeafletMap

public WLeafletMap(WContainerWidget parentContainer)

Create a new WLeafletMap.

WLeafletMap

public WLeafletMap()

Create a new WLeafletMap.

Calls this((WContainerWidget)null)

WLeafletMap

public WLeafletMap(com.google.gson.JsonObject options,
 WContainerWidget parentContainer)

Create a new WLeafletMap with the given options.

See Also:

• setOptions(com.google.gson.JsonObject options)

WLeafletMap

public WLeafletMap(com.google.gson.JsonObject options)

Create a new WLeafletMap with the given options.

Calls this(options, (WContainerWidget)null)

Method Details

remove

public void remove()

Description copied from class: WWidget

Destructor.

Deletes a widget and all contained contents.

Overrides:

remove in class WCompositeWidget

See Also:

• WWidget.removeWidget(WWidget widget)

setOptions

public void setOptions(com.google.gson.JsonObject options)

Change the options of the WLeafletMap.

Note: This fully rerenders the map, because it creates a new Leaflet map, so any custom JavaScript modifying the map with e.g. WCompositeWidget#doJavaScript() is undone, much like reloading the page when reload-is-new-session is set to false. See https://leafletjs.com/reference.html#map for a list of options.

addTileLayer

public void addTileLayer(String urlTemplate,
 com.google.gson.JsonObject options)

Add a new tile layer.

See https://leafletjs.com/reference.html#tilelayer

addMarker

public void addMarker(WLeafletMap.Marker marker)

Add the given marker.

removeMarker

public WLeafletMap.Marker removeMarker(WLeafletMap.Marker marker)

Remove the given marker.

addPolyline

public void addPolyline(List<WLeafletMap.Coordinate> points,
 WPen pen)

Add a polyline.

This will draw a polyline on the map going through the given list of coordinates, with the given pen.

See https://leafletjs.com/reference.html#polyline

addCircle

public void addCircle(WLeafletMap.Coordinate center,
 double radius,
 WPen stroke,
 WBrush fill)

Add a circle.

This will draw a circle on the map centered at center, with the given radius (in meters), drawn with the given stroke and fill.

setZoomLevel

public void setZoomLevel(int level)

Set the current zoom level.

getZoomLevel

public int getZoomLevel()

Get the current zoom level.

panTo

public void panTo(WLeafletMap.Coordinate center)

Pan to the given coordinate.

getPosition

public WLeafletMap.Coordinate getPosition()

Get the current position.

zoomLevelChanged

public JSignal1<Integer> zoomLevelChanged()

Signal emitted when the user has changed the zoom level of the map.

panChanged

public JSignal2<Double,Double> panChanged()

Signal emitted when the user has panned the map.

getMapJsRef

public String getMapJsRef()

Returns a JavaScript expression to the Leaflet map object.

You may want to use this in conjunction with JSlot or WCompositeWidget#doJavaScript() in custom JavaScript code, e.g. to access features not built-in to WLeafletMap.

render

protected void render(EnumSet<RenderFlag> flags)

Description copied from class: WWidget

Renders the widget.

This function renders the widget (or an update for the widget), after this has been scheduled using scheduleRender().

The default implementation will render the widget by serializing changes to JavaScript and HTML. You may want to reimplement this widget if you have been postponing some of the layout / rendering implementation until the latest moment possible. In that case you should make sure you call the base implementation however.

Overrides:

render in class WCompositeWidget