Drag and Drop in GWT

[Ani]

HI

 I am working on a Diagram editor with GWT. The requirement is to be able to drag from a palette and draw and connect different shapes.

So using a Canvas component for the drawing part.

 Does GWT have an in built Drag and Drop Framework?

Any help is appreciated

Regards

Ani

[Mike Warne]

Most GWT components support drag and drop event handling.

For example: Labels, Grids, etc.

Not sure if this helps when drawing to a canvas...

HTML h = new HTML("Hello");

HandlerRegistration regHandler = h.addDragStartHandler(....); 

Mike

[Drew Spencer]

Check out https://github.com/fredsa/gwt-dnd :)

[Jens]

Take a look at "Lienzo" for GWT: https://www.lienzo-core.com/lienzo-ks/#WELCOME

-- J.

[salk31]

I'd suggest at least looking into using "native" drag and drop support. I imagine it is much lighter and it supports dragging between windows etc... I think gwt-dnd was created before this was available.

[Ignacio Baca Moreno-Torres]

If you are going to use native drag and drop you might what some stream composition lib XD, rxjava makes event plumbing a bit easier, clean and powerful, and rxgwt has various tools to start using rxjava with gwt, see this example using elemental touch events https://github.com/intendia-oss/rxgwt/blob/master/examples/elemental/src/main/java/com/intendia/rxgwt/example/client/ElementalExample.java

[avsgi]

Hi.

I'm very interested in this approach, but I don't know how to do this. Could you point me to some example application?

Regards.

El 27/01/2017 11:51, salk31 <sal...@gmail.com> escribió:

I'd suggest at least looking into using "native" drag and drop support. I imagine it is much lighter and it supports dragging between windows etc... I think gwt-dnd was created before this was available.

On Monday, January 23, 2017 at 4:54:29 PM UTC, Ani wrote:

HI

 I am working on a Diagram editor with GWT. The requirement is to be able to drag from a palette and draw and connect different shapes.

So using a Canvas component for the drawing part.

 Does GWT have an in built Drag and Drop Framework?

Any help is appreciated

Regards

Ani

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[salk31]

I'm not aware of any GWT wrappers but the JavaScript is pretty simple (so easy if you are happy with js interop). 

https://developer.mozilla.org/en-US/docs/Web/API/HTML_Drag_and_Drop_API

gwt_dnd is pretty good but even if you have to do the js interop yourself I think the complexity will be similar.

If you don't find off the shelf wrappers I'd be up for helping to come up with something. We have a large gwt_dnd based app that I'd like to move.

On Friday, January 27, 2017 at 11:40:17 PM UTC, Asier wrote:

Hi.

I'm very interested in this approach, but I don't know how to do this. Could you point me to some example application?

Regards.

El 27/01/2017 11:51, salk31 <sal...@gmail.com> escribió:

I'd suggest at least looking into using "native" drag and drop support. I imagine it is much lighter and it supports dragging between windows etc... I think gwt-dnd was created before this was available.

On Monday, January 23, 2017 at 4:54:29 PM UTC, Ani wrote:

HI

 I am working on a Diagram editor with GWT. The requirement is to be able to drag from a palette and draw and connect different shapes.

So using a Canvas component for the drawing part.

 Does GWT have an in built Drag and Drop Framework?

Any help is appreciated

Regards

Ani

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To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit+unsub...@googlegroups.com.

[Thomas Broyer]

Drag and drop is in GWT proper (DropEvent et al)

[salk31]

doh + excellent

Even more keen to switch our app.