user-interface - Blackberry Java：TextField *没有*插入符号？

Question

我想要一个甚至不显示插入符号的不可编辑的 TextField （或子类）。或者，我想要一个多行标签字段。这些有可能吗？

Answer 1

没有焦点光标的文本字段

TextField readOnly = new TextField(NON_FOCUSABLE);
readOnly.setText("Read only, no carret");
add(readOnly);

TextField drawFocus 覆盖

如果文本太大而无法适应屏幕，您可以覆盖 TextField 中的 drawFocus 方法，这样就可以滚动：

TextField readOnly = new TextField(READONLY)
{
    protected void drawFocus(Graphics graphics, boolean on) {}
};

TextFields，用 NullFields 分隔

其他选项是将 TextField 拆分为多个，用 NullFields 分隔：

class Scr extends MainScreen {
    public Scr() {

        String text = "Lorem ipsum dolor sit amet, consectetuer "
                + "adipiscing elit, sed diam nonummy nibh euismod "
                + "tincidunt ut laoreet dolore magna aliquam erat "
                + "volutpat. Ut wisi enim ad minim veniam, quis "
                + "nostrud exerci tation ullamcorper suscipit "
                + "lobortis nisl ut aliquip ex ea commodo consequat. "
                + "Duis autem vel eum iriure dolor in hendrerit in "
                + "vulputate velit esse molestie consequat, vel "
                + "illum dolore eu feugiat nulla facilisis at vero "
                + "eros et accumsan et iusto odio dignissim qui "
                + "blandit praesent luptatum zzril delenit augue "
                + "duis dolore te feugait nulla facilisi.";

        text = addScrollText(text, 150);
    }

    private String addScrollText(String text, int partSize) {
        while (0 < text.length()) {
            int len = Math.min(partSize, text.length());
            TextField readOnly = new TextField(NON_FOCUSABLE);
            readOnly.setText(text.substring(0, len));
            add(readOnly);
            add(new NullField());
            text = text.substring(len);
        }
        return text;
    }
}

多行标签字段

LabelField 中的多行文本，只需使用换行符转义符：

String text = "first line \nnew line \nanother line";
LabelField multiLine = new LabelField(text);
add(multiLine);

Answer 2

是的，您可以覆盖每个 UI 元素的绘制方法

一个例子：

public class WhiteLabelField extends LabelField 
{
    public WhiteLabelField()
    {
        super();
    }
    public WhiteLabelField(ObjectGroup text)
    {
        super(text);
    }
    public WhiteLabelField(Object text, long style)
    {
        super(text, style);
    }
    public void paint(Graphics _g)
    {
        _g.setColor(Color.WHITE);
        super.paint(_g);
    }
    // Custom
    public void setSmallFontSize()
    {
        setFont( Font.getDefault( ).derive( Font.PLAIN, 16 ));
    }
}

Answer 3

你也可以使用RichTextField带有风格的 a Field.NON_FOCUSABLE，你就会得到你想要的。