Move & Copy DnD operation on OS-X and Linux

[Tom Schindl]

Done as https://bugs.openjdk.java.net/browse/JDK-8153032

Tom

On 29.03.16 22:19, David Hill wrote:
> On 3/29/16, 7:04 AM, Tom Schindl wrote:
>> Hi,
> Tom,
>    This is something we might be able to change in 9.
> Would you file a bug for this ?
> 
> thanks,
>    Dave
>>
>> While developing our editor control we tried to implement DnD of
>> Text-Selection to:
>> * to rearrange text inside the control
>> * to copy text selections to another position inside the text
>>
>> On Win32 everything works as expected, if you start dragging the initial
>> operation is MOVE and you can change that to a COPY by pressing CTRL
>> while dragging.
>>
>> On Linux the initial gesture is COPY which is not how DnD works in
>> things like nautilus, ... . I can get that to change to a move operation
>> by holding the SHIFT key.
>>
>> On OS-X the initial gesture is a COPY and which is not how DnD works
>> finder or eg Finder, and I haven't found a way to change the operation
>> to a MOVE.
>>
>> I would expect the following on ALL operation systems:
>> - a drag WITHOUT any modifier key is a MOVE operation
>>
>> - on Windows&  Linux I make it to a copy operation by pressing CTRL
>>    while dragging
>>
>> - on OS-X I make it a copy operation by pressing ALT while dragging
>>
>> In general I think the problem is even bigger because the default
>> operation depends on the target eg on windows when you drag a file
>> between 2 folders on the same filesystem you get a default MOVE but if
>> you drag to another one the default is a COPY and SHIFT makes it a MOVE.
>>
>> JavaFX does all that right but what it gets wrong is the default
>> operation. Any thoughts on this? Did we miss something obvious?
>>
>> The simple application below is how to reproduce.
>>
>>> package application;
>>>
>>>
>>> import javafx.application.Application;
>>> import javafx.scene.Scene;
>>> import javafx.scene.input.ClipboardContent;
>>> import javafx.scene.input.DataFormat;
>>> import javafx.scene.input.DragEvent;
>>> import javafx.scene.input.Dragboard;
>>> import javafx.scene.input.MouseEvent;
>>> import javafx.scene.input.TransferMode;
>>> import javafx.scene.layout.BorderPane;
>>> import javafx.stage.Stage;
>>>
>>>
>>> public class Main extends Application {
>>>
>>>     private BorderPane root;
>>>     @Override
>>>     public void start(Stage primaryStage) {
>>>         try {
>>>             root = new BorderPane();
>>>             Scene scene = new Scene(root,400,400);
>>>            
>>> scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
>>>
>>>             primaryStage.setScene(scene);
>>>             primaryStage.show();
>>>
>>>             root.setOnDragDetected(this::onDragDetected);
>>>             root.setOnDragOver(this::onDragOver);
>>>             root.setOnDragDropped(this::onDragDropped);
>>>             root.setOnDragDone(this::onDragDone);
>>>
>>>         } catch(Exception e) {
>>>             e.printStackTrace();
>>>         }
>>>     }
>>>
>>>     public static void main(String[] args) {
>>>         launch(args);
>>>     }
>>>
>>>     private final DataFormat f = new DataFormat() {
>>>     };
>>>
>>>     private void onDragDetected(MouseEvent event) {
>>>         System.err.println(this + " onDragDetected");
>>>         Dragboard db = root.startDragAndDrop(TransferMode.ANY);
>>>
>>>         ClipboardContent c = new ClipboardContent();
>>>         c.putString("Hello world");
>>>         db.setContent(c);
>>>         event.consume();
>>>     }
>>>
>>>     private void onDragOver(DragEvent event) {
>>>         event.getTransferMode();
>>>         event.acceptTransferModes(TransferMode.ANY);
>>>         System.err.println(event.getTransferMode());
>>> //        System.err.println("onDragOver " +
>>> event.getAcceptedTransferMode());
>>>         event.consume();
>>>     }
>>>
>>>     private void onDragDropped(DragEvent event) {
>>>         System.err.println(this + " onDragDropped " +
>>> event.getAcceptedTransferMode());
>>>         event.setDropCompleted(true);
>>>         event.consume();
>>>     }
>>>
>>>     private void onDragDone(DragEvent event) {
>>>         System.err.println(this + " onDragDone "  +
>>> event.getAcceptedTransferMode());
>>>         System.err.println("payload: " +
>>> event.getDragboard().getString());
>>>         event.consume();
>>>     }
>>> }
>>
>>
> 
> 


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Thomas Schindl, CTO
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