java - 如何在诺基亚asha sdk1.0中使textArea可滚动

Question

我正在开发诺基亚asha sdk1.0。我在我的应用程序中使用TextArea，但我的textarea不可滚动。我使用了以下代码，那么如何使其可滚动。

Display.init(this);
        Display.getInstance().setForceFullScreen(true);
        Form form=new Form();
        form.setScrollable(false);
        form.getUnselectedStyle().setBgColor(10175989);
        form.setLayout(new BorderLayout());
        Container northcon=new Container();
        int northcomponentHT=form.getPreferredH()*20/100;
        northcon.setPreferredH(northcomponentHT);
        Label northlab=new Label("NORTH");
        northcon.addComponent(northlab);
        form.addComponent(BorderLayout.NORTH,northcon);
        Container centercon=new Container();
        TextArea textarea=new TextArea();
        int centercomponentHT=form.getPreferredH()*60/100;
        textarea.setPreferredH(centercomponentHT);
        textarea.setPreferredW(form.getPreferredW());
        String string=new String("dfjjkfjknfsdfhkfjfjcannot be surpassed by that of watching electric lights. Everyone in Gods creation is special and so are wcannot be surpassed by that of watching electric lights. Everyone in Gods creation is special and so are wcannot be surpassed by that of watching electric lights. Everyone in Gods creation is special and so are wcannot be surpassed by that of watching electric lights. Everyone in Gods creation is special and so are wcannot be surpassed by that of watching electric lights. Everyone in Gods creation is special and so are wcannot be surpassed by that of watching electric lights. Everyone in Gods creation is special and so are wcannot be surpassed by that of watching electric lights. Everyone in Gods creation is special and so are wkfiufjkfjkfjfjkfjierojfkjjiojkldf;jasf;ljsf;jl;dfjas;dflk;lfj;asdfljsdl;fkjierojeiorjoiejkfjoeirjjeoirjoejo;efdfkljoijerjorj");
        textarea.setScrollVisible(true);

        textarea.setText(string);
        textarea.setEditable(false);
        textarea.setGrowByContent(true);
        textarea.setRows(50);

        //centercon.setScrollable(true);
        centercon.addComponent(textarea);

        form.addComponent(BorderLayout.CENTER,centercon);
        Container southcon=new Container();
        int southcomponentHT=form.getPreferredH()*20/100;
        southcon.setPreferredH(southcomponentHT);
        Label southlab=new Label("SOUTH");
        southcon.addComponent(southlab);
        form.addComponent(BorderLayout.SOUTH,southcon);
        form.show();

Answer 1

要使 TextArea 文本可滚动，您必须使用滚动 Pane 。

你需要做类似的事情

JScrollPane scrollPane = new JScrollPane(textarea);

有关 JScrollPanes 的更多信息，请访问 http://docs.oracle.com/javase/7/docs/api/javax/swing/JScrollPane.html