RE: gtk3 drag and drop sample/demo

[Pankaj Bansal <pankaj b bansal oracle com>]

Hello Emmanaele,

 

Thanks for replying and sorry if I sounded unreasonable to go and check the issue. I was referring to look at 
the issue and reproducer for the issue. 

 

Issue:

In Ubuntu 16.04 (gtk3.18) all works fine for in JavaFX. 

For Ubuntu 18.04 (gtk3.20 or later), the dnd stops working. I have found that we are not getting any calls 
from gtk side. I mean gtk is not calling the event callback function. I see that there is only one DragEnter 
event, one DragMotion event and then one DragEnd event. Whereas with gtk 3.18, we get many DragMotionm events 
which is what supposed to happen. 

 

Below is a sample code, which can be used to easily see the issue. It is using the JavaFX for dnd.

 

I was hoping to get hands on some dnd native sample/demo which works fine with gtk3.20 or later. But if you 
are saying that nothing has changed, so I have to see what makes our code stop working from gtk3.20

 

 

//Sample Fx11draggError.java

 

import javafx.application.Application; 

import javafx.scene.Scene; 

import javafx.scene.control.Button; 

import javafx.scene.input.ClipboardContent; 

import javafx.scene.input.TransferMode; 

import javafx.stage.Stage; 

public class Fx11draggError extends Application{ 

@Override 

public void start(Stage stage) throws Exception { 

               Button button = new Button("test"); 

               button.setOnDragDetected(e -> { 

                              System.out.println("Drag detected");

                              ClipboardContent content = new ClipboardContent(); 

                              content.putString("It works"); 

                              button.startDragAndDrop(TransferMode.COPY).setContent(content); 

                              e.consume(); 

               }); 

        button.setOnDragOver((ev)-> {System.out.println("Drag over"); ev.consume();}); 

        button.setOnDragDropped((ev)-> {System.out.println("Drag end"); ev.consume();}); 

        button.setOnDragDone((ev)-> {System.out.println("Drag done"); ev.consume();}); 

       stage.setScene(new Scene(button, 200, 200)); 

       stage.show(); 

} 

public static void main(String[] args) { 

launch(); 

} 

}

 

-Pankaj

 

From: Emmanuele Bassi [mailto:ebassi gmail com] 
Sent: Monday, April 15, 2019 5:26 PM
To: Pankaj Bansal
Cc: gtk-app-devel-list list
Subject: Re: gtk3 drag and drop sample/demo

 

On Mon, 15 Apr 2019 at 12:45, Pankaj Bansal via gtk-app-devel-list <HYPERLINK "mailto:gtk-app-devel-list 
gnome org"gtk-app-devel-list gnome org> wrote:

 

I am working with OpenJDK JavaFX dev group and we are facing some problems with drag and drop functionality 
with gtk3.20 or later. You can have a look at the bug for more information 
https://bugs.openjdk.java.net/browse/JDK-8211302. It will be great if someone can point out any big change 
done with respect to drag and drop from gtk3.20.

 

First of all, it's kind of rude to ask people to go to a random bug tracker and ask for a code review without 
stating what the issue is.

 

Can you explain what issues are you experiencing?

 

I am looking for a sample/demo for drag and drop functionality using gtk3. I can see that there is one demo 
at [1], but it is not compatible with gtk3 as it is using gtk4 specific structs and functions. I am not able 
to find any other working demo/sample working with gtk3. It would be great if anyone can point to me to 
something useful.

 

The drag and drop code in GTK 3 hasn't really changed from the 2.x days, and has been substantially reworked 
for GTK 4.

 

The old drag and drop tutorial may be of help: HYPERLINK 
"https://urldefense.proofpoint.com/v2/url?u=https-3A__wiki.gnome.org_Newcomers_DragNDropTutorial&d=DwMFaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=nHVEjVI-guB2suhUDbwru96xVVrQOkjZ4oHvLp8rBFo&m=k76mPqvxlua5kHEVFWSnXbdNteF7JdealQN3v-KVELc&s=3cUNH1P03apgAfDvBiT0NPIXKGbGVyAOQ2uhcFlSjzY&e="https://wiki.gnome.org/Newcomers/DragNDropTutorial

 

Ciao,

 Emmanuele.

 

-- 

HYPERLINK 
"https://urldefense.proofpoint.com/v2/url?u=https-3A__www.bassi.io&d=DwMFaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=nHVEjVI-guB2suhUDbwru96xVVrQOkjZ4oHvLp8rBFo&m=k76mPqvxlua5kHEVFWSnXbdNteF7JdealQN3v-KVELc&s=adNpmoTJk5ufLg6lUH49hjZcSXWNzTTWCMInMXMuGs4&e="https://www.bassi.io
[@] ebassi [@HYPERLINK 
"https://urldefense.proofpoint.com/v2/url?u=http-3A__gmail.com&d=DwMFaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=nHVEjVI-guB2suhUDbwru96xVVrQOkjZ4oHvLp8rBFo&m=k76mPqvxlua5kHEVFWSnXbdNteF7JdealQN3v-KVELc&s=1HMnpf-boburUX2mA71lOOnlacW-IU1aoV3WwBRXQEY&e="gmail.com]