Example usage for org.eclipse.jface.util LocalSelectionTransfer nativeToJava

Introduction

In this page you can find the example usage for org.eclipse.jface.util LocalSelectionTransfer nativeToJava.

Prototype

@Override
public Object nativeToJava(TransferData transferData) 

Source Link

Document

Overrides org.eclipse.swt.dnd.ByteArrayTransfer#nativeToJava(TransferData).

Usage

From source file:org.eclipse.e4mf.edit.ui.dnd.EditingDomainViewerDropAdapter.java

License:Open Source License

/** 
 * This attempts to extract the drag source from the event early, i.e.,
 * before the drop method. This implementation tries to use a
 * {@link org.eclipse.e4mf.edit.ui.dnd.LocalTransfer}. If the data is not yet
 * available (e.g. on platforms other than win32), it just returns null.
 *//*w  ww .ja  va 2 s .  c  om*/
protected Collection<?> getDragSource(DropTargetEvent event) {
    // Check whether the current data type can be transfered locally.
    //
    LocalTransfer localTransfer = LocalTransfer.getInstance();
    if (localTransfer.isSupportedType(event.currentDataType)) {
        // Motif kludge: we would get something random instead of null.
        //
        if (IS_MOTIF)
            return null;

        // Transfer the data and, if non-null, extract it.
        //
        Object object = localTransfer.nativeToJava(event.currentDataType);
        return object == null ? null : extractDragSource(object);
    } else {
        LocalSelectionTransfer localSelectionTransfer = LocalSelectionTransfer.getTransfer();
        if (localSelectionTransfer.isSupportedType(event.currentDataType)) {
            // Motif kludge: we would get something random instead of null.
            //
            if (IS_MOTIF)
                return null;

            // Transfer the data and, if non-null, extract it.
            //
            Object object = localSelectionTransfer.nativeToJava(event.currentDataType);
            return object == null ? null : extractDragSource(object);
        }

        FileTransfer fileTransfer = FileTransfer.getInstance();
        if (fileTransfer.isSupportedType(event.currentDataType)) {
            // Motif kludge: we would get something random instead of null.
            //
            if (IS_MOTIF)
                return null;

            // Transfer the data and, if non-null, extract it.
            //
            Object object = fileTransfer.nativeToJava(event.currentDataType);
            return object == null ? null : extractDragSource(object);
        } else {
            // Iterate over the data types to see if there is a data type that supports a local transfer.
            //
            TransferData[] dataTypes = event.dataTypes;
            for (int i = 0; i < dataTypes.length; ++i) {
                TransferData transferData = dataTypes[i];

                // If the local transfer supports this data type, switch to that data type
                //
                if (localTransfer.isSupportedType(transferData)) {
                    event.currentDataType = transferData;
                    return null;
                }
            }

            // Iterate over the data types to see if there is a data type that supports a local selection transfer.
            //
            for (int i = 0; i < dataTypes.length; ++i) {
                TransferData transferData = dataTypes[i];

                // If the local selection transfer supports this data type, switch to that data type
                //
                if (localSelectionTransfer.isSupportedType(transferData)) {
                    event.currentDataType = transferData;
                    return null;
                }
            }

            // Iterate over the data types to see if there is a data type that supports a file transfer.
            //
            for (int i = 0; i < dataTypes.length; ++i) {
                TransferData transferData = dataTypes[i];

                // If the file transfer supports this data type, switch to that data type
                //
                if (fileTransfer.isSupportedType(transferData)) {
                    event.currentDataType = transferData;
                    return null;
                }
            }
            return null;
        }
    }
}

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