Example usage for org.eclipse.swt.custom StyledText setData

Introduction

In this page you can find the example usage for org.eclipse.swt.custom StyledText setData.

Prototype

@Override
    public void setData(String key, Object value) 

Source Link

Usage

From source file:org.eclipse.swt.snippets.Snippet257.java

public static void main(String[] args) {
    final Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("Snippet 257");
    shell.setLayout(new FillLayout());
    shell.setSize(100, 300);// w  ww .  java 2  s.c om
    int style = SWT.MULTI | SWT.WRAP | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER;
    final StyledText text = new StyledText(shell, style);
    text.setText(string1);
    final DragSource source = new DragSource(text, DND.DROP_COPY | DND.DROP_MOVE);
    source.setDragSourceEffect(new DragSourceEffect(text) {
        @Override
        public void dragStart(DragSourceEvent event) {
            event.image = display.getSystemImage(SWT.ICON_WARNING);
        }
    });
    source.setTransfer(TextTransfer.getInstance());
    source.addDragListener(new DragSourceAdapter() {
        Point selection;

        @Override
        public void dragStart(DragSourceEvent event) {
            selection = text.getSelection();
            event.doit = selection.x != selection.y;
            text.setData(DRAG_START_DATA, selection);
        }

        @Override
        public void dragSetData(DragSourceEvent e) {
            e.data = text.getText(selection.x, selection.y - 1);
        }

        @Override
        public void dragFinished(DragSourceEvent event) {
            if (event.detail == DND.DROP_MOVE) {
                Point newSelection = text.getSelection();
                int length = selection.y - selection.x;
                int delta = 0;
                if (newSelection.x < selection.x)
                    delta = length;
                text.replaceTextRange(selection.x + delta, length, "");
            }
            selection = null;
            text.setData(DRAG_START_DATA, null);
        }
    });

    DropTarget target = new DropTarget(text, DND.DROP_DEFAULT | DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_LINK);
    target.setTransfer(TextTransfer.getInstance());
    target.addDropListener(new DropTargetAdapter() {
        @Override
        public void dragEnter(DropTargetEvent event) {
            if (event.detail == DND.DROP_DEFAULT) {
                if (text.getData(DRAG_START_DATA) == null)
                    event.detail = DND.DROP_COPY;
                else
                    event.detail = DND.DROP_MOVE;
            }
        }

        @Override
        public void dragOperationChanged(DropTargetEvent event) {
            if (event.detail == DND.DROP_DEFAULT) {
                if (text.getData(DRAG_START_DATA) == null)
                    event.detail = DND.DROP_COPY;
                else
                    event.detail = DND.DROP_MOVE;
            }
        }

        @Override
        public void dragOver(DropTargetEvent event) {
            event.feedback = DND.FEEDBACK_SCROLL | DND.FEEDBACK_SELECT;
        }

        @Override
        public void drop(DropTargetEvent event) {
            if (event.detail != DND.DROP_NONE) {
                Point selection = (Point) text.getData(DRAG_START_DATA);
                int insertPos = text.getCaretOffset();
                if (event.detail == DND.DROP_MOVE && selection != null && selection.x <= insertPos
                        && insertPos <= selection.y
                        || event.detail == DND.DROP_COPY && selection != null && selection.x < insertPos
                                && insertPos < selection.y) {
                    text.setSelection(selection);
                    event.detail = DND.DROP_COPY; // prevent source from deleting selection
                } else {
                    String string = (String) event.data;
                    text.insert(string);
                    if (selection != null)
                        text.setSelectionRange(insertPos, string.length());
                }
            }
        }
    });
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

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