org.eclipse.swt.dnd.DragSource Java Examples

/**
 * Returns the shell for the given widget. If the widget doesn't represent a SWT object that manage a shell,
 * <code>null</code> is returned.
 * 
 * @param widget
 *            the widget
 * 
 * @return the shell for the given widget
 */
public static Shell getShell(Widget widget) {
	if (widget instanceof Control)
		return ((Control) widget).getShell();
	if (widget instanceof Caret)
		return ((Caret) widget).getParent().getShell();
	if (widget instanceof DragSource)
		return ((DragSource) widget).getControl().getShell();
	if (widget instanceof DropTarget)
		return ((DropTarget) widget).getControl().getShell();
	if (widget instanceof Menu)
		return ((Menu) widget).getParent().getShell();
	if (widget instanceof ScrollBar)
		return ((ScrollBar) widget).getParent().getShell();

	return null;
}
 

protected void uninstall() {
	if (getViewer() == null || !fIsTextDragAndDropInstalled) { return; }

	final IDragAndDropService dndService = editor.getSite().getService(IDragAndDropService.class);
	if (dndService == null) { return; }

	final StyledText st = getStyledText();
	dndService.removeMergedDropTarget(st);

	final DragSource dragSource = (DragSource) st.getData(DND.DRAG_SOURCE_KEY);
	if (dragSource != null) {
		dragSource.dispose();
		st.setData(DND.DRAG_SOURCE_KEY, null);
	}

	fIsTextDragAndDropInstalled = false;
}
 

/**
 * Returns the shell for the given widget. If the widget doesn't represent a SWT object that manage a shell,
 * <code>null</code> is returned.
 * 
 * @return the shell for the given widget
 */
public static Shell getShell(Widget widget)
{
	if (widget instanceof Control)
		return ((Control) widget).getShell();
	if (widget instanceof Caret)
		return ((Caret) widget).getParent().getShell();
	if (widget instanceof DragSource)
		return ((DragSource) widget).getControl().getShell();
	if (widget instanceof DropTarget)
		return ((DropTarget) widget).getControl().getShell();
	if (widget instanceof Menu)
		return ((Menu) widget).getParent().getShell();
	if (widget instanceof ScrollBar)
		return ((ScrollBar) widget).getParent().getShell();

	return null;
}
 

/**
 * Returns the shell for the given widget. If the widget doesn't represent
 * a SWT object that manage a shell, <code>null</code> is returned.
 * @param widget the widget
 *
 * @return the shell for the given widget
 */
public static Shell getShell(Widget widget) {
	if (widget instanceof Control)
		return ((Control)widget).getShell();
	if (widget instanceof Caret)
		return ((Caret)widget).getParent().getShell();
	if (widget instanceof DragSource)
		return ((DragSource)widget).getControl().getShell();
	if (widget instanceof DropTarget)
		return ((DropTarget)widget).getControl().getShell();
	if (widget instanceof Menu)
		return ((Menu)widget).getParent().getShell();
	if (widget instanceof ScrollBar)
		return ((ScrollBar)widget).getParent().getShell();

	return null;
}
 

/**
 * Returns the shell for the given widget. If the widget doesn't represent
 * a SWT object that manage a shell, <code>null</code> is returned.
 * @param widget the widget
 *
 * @return the shell for the given widget
 */
public static Shell getShell(Widget widget) {
    if (widget instanceof Control) {
        return ((Control) widget).getShell();
    }
    if (widget instanceof Caret) {
        return ((Caret) widget).getParent().getShell();
    }
    if (widget instanceof DragSource) {
        return ((DragSource) widget).getControl().getShell();
    }
    if (widget instanceof DropTarget) {
        return ((DropTarget) widget).getControl().getShell();
    }
    if (widget instanceof Menu) {
        return ((Menu) widget).getParent().getShell();
    }
    if (widget instanceof ScrollBar) {
        return ((ScrollBar) widget).getParent().getShell();
    }

    return null;
}
 

private void setup(){
	DragSource mine = new DragSource(viewer.getControl(), DND.DROP_COPY);
	mine.setTransfer(new Transfer[] {
		myTransfer
	});
	mine.addDragListener(this);
}
 

private void setup(){
	DragSource mine = new DragSource(dragSource, DND.DROP_COPY);
	mine.setTransfer(new Transfer[] {
		myTransfer
	});
	mine.addDragListener(this);
}
 

private void setup(){
	DragSource mine = new DragSource(dragSource, DND.DROP_COPY);
	mine.setTransfer(new Transfer[] {
		myTransfer
	});
	mine.addDragListener(this);
}
 

private void initDragDrop() {
    DragSource dragSource = new DragSource(this, DND.DROP_COPY | DND.DROP_MOVE);
    dragSource.addDragListener(new DragSourceAdapter());
    dragSource.setTransfer(new Transfer[] { org.eclipse.swt.dnd.TextTransfer.getInstance() });

    DropTarget dropTarget = new DropTarget(this, DND.DROP_COPY | DND.DROP_MOVE);
    dropTarget.setTransfer(new Transfer[] { LocalSelectionTransfer.getTransfer(),
            org.eclipse.swt.dnd.TextTransfer.getInstance() });
    dropTarget.addDropListener(new DragTargetAdapter());
}
 

private void createDataField( )
{
	Composite dataField = new Composite( this, SWT.NONE );
	dataField.setLayoutData( new GridData( GridData.FILL_BOTH ) );
	dataField.setLayout( new GridLayout( ) );

	Label dataLabel = new Label( dataField, SWT.NONE );
	dataLabel.setText( Messages.getString( "GroupsPage.Label.DataField" ) ); //$NON-NLS-1$
	dataFieldsViewer = new TreeViewer( dataField, SWT.SINGLE
			| SWT.H_SCROLL
			| SWT.V_SCROLL
			| SWT.BORDER );
	cubeLabelProvider = getCubeLabelProvider( );
	cubeLabelProvider.setProivderViewer( true );
	dataFieldsViewer.setLabelProvider( cubeLabelProvider );
	dataFieldsViewer.setContentProvider( dataContentProvider );
	dataFieldsViewer.setAutoExpandLevel( 3 );
	GridData gd = new GridData( GridData.FILL_BOTH );
	dataFieldsViewer.getTree( ).setLayoutData( gd );
	( (GridData) dataFieldsViewer.getTree( ).getLayoutData( ) ).heightHint = 250;
	( (GridData) dataFieldsViewer.getTree( ).getLayoutData( ) ).widthHint = 200;
	dataFieldsViewer.addSelectionChangedListener( new ISelectionChangedListener( ) {

		public void selectionChanged( SelectionChangedEvent event )
		{
			updateButtons( );
		}

	} );

	final DragSource fieldsSource = new DragSource( dataFieldsViewer.getTree( ),
			operations );
	fieldsSource.setTransfer( types );
	fieldsSource.addDragListener( new CustomDragListener( dataFieldsViewer ) );

}
 

protected void addDragListenerToHeaderButton( Button button )
{
	DragSource ds = new DragSource( button, DND.DROP_COPY );
	ds.setTransfer( new Transfer[]{
		SimpleTextTransfer.getInstance( )
	} );
	CustomPreviewTableDragListener dragSourceAdapter = new CustomPreviewTableDragListener( this,
			button.getText( ) );
	ds.addDragListener( dragSourceAdapter );
}
 

private void addDragListener(Control control) {
	LocalSelectionTransfer transfer = LocalSelectionTransfer.getTransfer();

	DragSourceAdapter dragAdapter = new DragSourceAdapter() {
		@Override
		public void dragSetData(DragSourceEvent event) {
			transfer.setSelection(new StructuredSelection(control));
		}
	};

	DragSource dragSource = new DragSource(control, DND.DROP_MOVE | DND.DROP_COPY);
	dragSource.setTransfer(new Transfer[] { transfer });
	dragSource.addDragListener(dragAdapter);
}
 

public static void main(String[] args) {
	// setup the SWT window
	Display display = new Display();
	final Shell shell = new Shell(display);
	shell.setLayout(new FillLayout());
	shell.setText("Photo Shuffler");

	// initialize a parent composite with a grid layout manager
	Composite parent = new Composite(shell, SWT.NONE);
	GridLayout gridLayout = new GridLayout();
	gridLayout.numColumns = 2;
	gridLayout.marginWidth=20;
	parent.setLayout(gridLayout);

	// determine the path where the pictures are stored
	String path = System.getProperty("user.dir") + "/images/";
	// initialize an array with the photograph names

	File imageDir= new File(path);
	
	// loop over the photo array and establish all listeners
	List<File> files = Arrays.stream(imageDir.listFiles())
				 	.filter(f -> f.isFile() && f.getName().endsWith(".png"))
					.collect(Collectors.toList());
	
	for (File file : files) {
		// labels serve as containers for the images
		Label label = new Label(parent, SWT.NONE);
		Image img = new Image(display,file.getAbsolutePath());
		label.setImage(img);

		// enable each label to be draggable
		DragSource source = new DragSource(label, DND.DROP_NONE);
		source.setTransfer(TextTransfer.getInstance()); // varargs are supported as of 4.7
		// add a drag listener
		source.addDragListener(new MyDragSourceListener(parent, source));

		// enable each label to be a drop target
		DropTarget target = new DropTarget(label, DND.DROP_NONE);
		target.setTransfer(new Transfer[] { TextTransfer.getInstance() }); // varargs are not yet supported see https://git.eclipse.org/r/#/c/92236			// add a drop listener
		target.addDropListener(new MyDropTargetListener(parent, target));
	}

	// show the SWT window
	shell.pack();
	shell.open();
	while (!shell.isDisposed()) {
		if (!display.readAndDispatch())
			display.sleep();
	}
	// tear down the SWT window
	display.dispose();
}
 

private void createButton(final Table table, final TableItem tableItem, final int index, final RGBa color)
{
	TableEditor editor = new TableEditor(table);
	Button button = new Button(table, SWT.PUSH | SWT.FLAT);
	Image image = createColorImage(table, color);
	button.setImage(image);
	button.pack();
	editor.minimumWidth = button.getSize().x - 4;
	editor.horizontalAlignment = SWT.CENTER;
	editor.setEditor(button, tableItem, index);
	fTableEditors.add(editor);
	button.setData("color", color); //$NON-NLS-1$

	button.addSelectionListener(new SelectionAdapter()
	{
		@Override
		public void widgetSelected(SelectionEvent e)
		{
			ColorDialog colorDialog = new ColorDialog(table.getShell());
			Button self = ((Button) e.widget);
			RGBa theColor = (RGBa) self.getData("color"); //$NON-NLS-1$
			if (theColor == null)
			{
				theColor = color;
			}
			colorDialog.setRGB(theColor.toRGB());
			RGB newRGB = colorDialog.open();
			if (newRGB == null)
			{
				return;
			}
			ThemeRule token = (ThemeRule) tableItem.getData();
			RGBa newColor = new RGBa(newRGB);
			if (index == 1)
			{
				getTheme().updateRule(table.indexOf(tableItem), token.updateFG(newColor));
			}
			else
			{
				getTheme().updateRule(table.indexOf(tableItem), token.updateBG(newColor));
			}
			// Update the image for this button!
			self.setImage(createColorImage(table, newColor));
			self.setData("color", newColor); //$NON-NLS-1$
			tableViewer.refresh();
		}
	});

	// Allow dragging the button out of it's location to remove the fg/bg for the rule!
	Transfer[] types = new Transfer[] { TextTransfer.getInstance() };
	final DragSource source = new DragSource(button, DND.DROP_MOVE);
	source.setTransfer(types);

	source.addDragListener(new DragSourceAdapter()
	{
		public void dragSetData(DragSourceEvent event)
		{
			event.data = "button:" + table.indexOf(tableItem) + ":" + index; //$NON-NLS-1$ //$NON-NLS-2$
		}
	});
}
 

public FilterViewer(Composite parent, int style, boolean isDialog) {
    super(parent, style);

    this.fIsDialog = isDialog;

    setLayout(new FillLayout());
    GridData gd = new GridData(SWT.FILL, SWT.FILL, true, true);
    setLayoutData(gd);

    final SashForm sash = new SashForm(this, SWT.HORIZONTAL);

    // Create the tree viewer to display the filter tree
    fViewer = new TreeViewer(sash, SWT.NONE);
    fViewer.setContentProvider(new FilterTreeContentProvider());
    fViewer.setLabelProvider(new FilterTreeLabelProvider());

    // Create the empty filter node properties panel
    fComposite = new Composite(sash, SWT.NONE);
    GridLayout gl = new GridLayout();
    gl.marginHeight = 0;
    gl.marginWidth = 0;
    fComposite.setLayout(gl);

    createContextMenu();

    fViewer.addSelectionChangedListener(event -> {
        if (!(event.getSelection().isEmpty()) && event.getSelection() instanceof IStructuredSelection) {
            // Update the filter node properties panel to the selection
            IStructuredSelection selection = (IStructuredSelection) event.getSelection();
            ITmfFilterTreeNode node = (ITmfFilterTreeNode) selection.getFirstElement();
            updateFilterNodeComposite(node);
        } else {
            updateFilterNodeComposite(null);
        }
    });

    fViewer.getTree().addPaintListener(e -> {
        TmfFilterTreeNode root = (TmfFilterTreeNode) fViewer.getInput();
        if (root == null || root.getChildrenCount() == 0) {
            e.gc.setForeground(FOREGROUND_COLOR);
            e.gc.drawText(Messages.FilterViewer_EmptyTreeHintText, 5, 0);
        }
    });

    int operations = DND.DROP_MOVE | DND.DROP_COPY;
    DragSource dragSource = new org.eclipse.swt.dnd.DragSource(fViewer.getTree(), operations);
    dragSource.setTransfer(new Transfer[] { LocalSelectionTransfer.getTransfer() });
    dragSource.addDragListener(new FilterDragSourceAdapter(this));
    DropTarget dropTarget = new DropTarget(fViewer.getTree(), operations);
    dropTarget.setTransfer(new Transfer[] { LocalSelectionTransfer.getTransfer() });
    dropTarget.addDropListener(new FilterDropTargetAdapter(this));
}
 

/**
 * @param parentComposite - the composite that holds all pictures
 * @param source - the drag source
 * 
 */
public MyDragSourceListener(Composite parentComposite, DragSource source) {
	this.parentComposite = parentComposite;
	this.source = source;
}
 

/**
 * Set a Drag Source and handle its disposal.
 * <br/>
 * Should be called on {@link TableLifeCycleListener#EVENT_TABLELIFECYCLE_INITIALIZED} event trigger
 */
DragSource createDragSource(int style);