gistfile1.txt

/**
 * This is the default rule editor widget (just text editor based) - more to come later.
 */
public class DefaultRuleContentWidget extends DirtyableComposite
        implements
        EditorWidget {

    private TextArea text;
    final private RuleContentText data;

    public DefaultRuleContentWidget(Asset a,
                                    RuleViewer v,
                                    ClientFactory clientFactory,
                                    EventBus eventBus) {
        this(a);
    }

    public DefaultRuleContentWidget(Asset a) {
        this(a,
                -1);
    }

    public DefaultRuleContentWidget(Asset a,
                                    int visibleLines) {
        data = (RuleContentText) a.getContent();

        if (data.content == null) {
            data.content = "";
        }

        text = new TextArea();
        text.setWidth("100%");
        text.setVisibleLines((visibleLines == -1) ? 16 : visibleLines);
        text.setText(data.content);

        text.getElement().setAttribute("spellcheck",
                "false"); //NON-NLS

        text.setStyleName("default-text-Area"); //NON-NLS

        text.addChangeHandler(new ChangeHandler() {
            public void onChange(ChangeEvent event) {
                data.content = text.getText();
                makeDirty();
            }
        });

        text.addKeyDownHandler(new KeyDownHandler() {

            public void onKeyDown(KeyDownEvent event) {
                if (event.getNativeKeyCode() == KeyCodes.KEY_TAB) {
                    int pos = text.getCursorPos();
                    insertText("\t");
                    text.setCursorPos(pos + 1);
                    text.cancelKey();
                    text.setFocus(true);
                }
            }
        });

        initWidget(text);

    }

    public void insertText(String ins) {
        int i = text.getCursorPos();
        String left = text.getText().substring(0,
                i);
        String right = text.getText().substring(i,
                text.getText().length());
        text.setText(left + ins + right);
        this.data.content = text.getText();
    }

}