B4J Question jGoogleMaps - Drag/Drop Marker Events

[RichardN]

The jGoogleMaps library does not expose marker drag or drop events.

Has anyone found a smart workaround for this perhaps using the Marker click event or mouse events or something else?

 

[TILogistic]

you want to do this

Edit fiddle - JSFiddle - Code Playground

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jsfiddle.net

GoogleMaps Marker - Dragged To New Location - Where?

If you move a draggable Marker to a new location there is no exposure of it's new LatLng position as there is no Marker_Drop event to exploit. How is it possible to read the new position? Is it possible to listen for this event?

www.b4x.com

 

[TILogistic]

mouse event

    Dim jo As JavaObject = gmap
    Dim event As Object = jo.CreateEventFromUI("com.lynden.gmapsfx.javascript.event.UIEventHandler", "MouseMove", Null)
    jo.GetFieldJO("map").RunMethod("addUIEventHandler", Array("mousemove", event))

Sub MouseMove_Event (MethodName As String, Args() As Object) As Object
    Dim jo As JavaObject = Args(0)
    jo = jo.RunMethod("getMember", Array("latLng"))
    Dim ll As LatLng = jo.InitializeNewInstance("com.lynden.gmapsfx.javascript.object.LatLong", Array(jo))
    Log( ll.Latitude & "," & ll.Longitude)
    Return Null
End Sub

 

[TILogistic]

Now with the published post you will see that you can add other marker events.
good luck

 

[RichardN]

@TILogistic... Thanks very much. I have just been called away on business for a few days but will check it out when I get back

 

[RichardN]

@TILogistic

Sorry for the delay.... I have been testing a few ideas around your code above. A constantly updated LL position is very useful if you can compare it to the previous marker position. Sadly without a working MouseUp event associated with map, map-pane or marker, then capturing the new marker position remains elusive.

I suppose I could run a timer sampling the Marker position but that's rather messy.

 

[TILogistic]

events on the map

    Dim jo As JavaObject = gMap
    Dim event As Object = jo.CreateEventFromUI("com.lynden.gmapsfx.javascript.event.UIEventHandler", "MouseMove", Null)
    jo.GetFieldJO("map").RunMethod("addUIEventHandler", Array("mousemove", event))
    
    Dim event As Object = jo.CreateEventFromUI("com.lynden.gmapsfx.javascript.event.UIEventHandler", "MouseUp", Null)
    jo.GetFieldJO("map").RunMethod("addUIEventHandler", Array("mouseup", event))
    
    Dim event As Object = jo.CreateEventFromUI("com.lynden.gmapsfx.javascript.event.UIEventHandler", "MouseDown", Null)
    jo.GetFieldJO("map").RunMethod("addUIEventHandler", Array("mousedown", event))
    
    Dim event As Object = jo.CreateEventFromUI("com.lynden.gmapsfx.javascript.event.UIEventHandler", "RightClick", Null)
    jo.GetFieldJO("map").RunMethod("addUIEventHandler", Array("rightclick", event))
    
    
    Dim event As Object = jo.CreateEventFromUI("com.lynden.gmapsfx.javascript.event.UIEventHandler", "MouseOut", Null)
    jo.GetFieldJO("map").RunMethod("addUIEventHandler", Array("mouseout", event))
    
    
    Dim event As Object = jo.CreateEventFromUI("com.lynden.gmapsfx.javascript.event.UIEventHandler", "Dblclick", Null)
    jo.GetFieldJO("map").RunMethod("addUIEventHandler", Array("dblclick", event))

 

[TILogistic]

For marker events, listeners are created as I posted here.

GoogleMaps Marker - Dragged To New Location - Where?

If you move a draggable Marker to a new location there is no exposure of it's new LatLng position as there is no Marker_Drop event to exploit. How is it possible to read the new position? Is it possible to listen for this event?

www.b4x.com

Ref;

GMapsFX 2.0.0 API

 

[RichardN]

@TILogistic Thanks for the clarification.....

Yes.. Markers... that was my next question!

I'll give it a go.

 

[TILogistic]

GMapsFX 2.0.0 API

events:

 

[RichardN]

@TILogistic .....

I can reproduce the map events just fine but I am failing with the marker DragEnd event. There is something wrong with this code where the event is not in the collection. I am missing something basic here.....

Dim jo As JavaObject = ThisMarker
jo.GetFieldJO("jsObject").RunMethod("eval", Array($"this.setOptions({draggable: true});"$))
        
Dim event As Object = jo.CreateEventFromUI("com.lynden.gmapsfx.javascript.event.UIEventHandler", "DragEnd", Null)
jo.GetFieldJO("marker").RunMethod("addUIEventHandler", Array("dragend", event))


Sub DragEnd_Event (MethodName As String, Args() As Object) As Object
    
    Log("Drag End Event Fired")
    Return Null
    
End Sub

 

[RichardN]

@TILogistic

You have quoted several references and examples in Java of how to access map-marker mouse events. You have also posted very comprehensive Google Maps examples to the forum where you have made extensive use of the Java Object method to expose events. I note however that none of you examples includes code to demonstrate JO calls to the jGoogleMaps library for the Marker events... dragstart, drag and dragend.

Is it possible that @Erel in his initial observation was correct in saying that access to these events is far from being a simple matter?

If you would like to post an example of a listener and event handler for Google Maps marker mouse events in B4J I know we would all be interested.