Question

我正在尝试创建一个IM程序作为一种爱好项目。我一直在尝试UI设计，并一直试图让这个原型用于实际的消息显示工作。

目前，框架设置如此;

JFrame内容窗格设置为使用Y_AXIS的BoxLayout的JPanel。
内容面板包含我想要显示的TextMessage对象，并单独添加到内容窗格中。

TextMessage对象的设置如下;

消息和发件人字符串存储在扩展JTextPane的TextMessage对象内，并使用StyledDocument进行格式化。
TextMessage放置在JPanel内部，以便允许在BoxLayout中正确放置对象。 JPanel设置为FlowLayout，它根据布尔值将TextMessage对象固定在JPanel的任一边缘。

到目前为止，一切都按照我的意愿行事，但有一个值得注意的例外。当我调整JFrame的大小时，TextMessage对象不会调整大小，而只是从屏幕边缘消失。

预期结果：

实际结果：

JFrame类：

public class NewMain extends JFrame {

    public NewMain() {
        setTitle("SparrowIM Chat Bubble");
        setPreferredSize(new Dimension(880, 550));
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setResizable(true);

        JPanel panel = new JPanel();
        panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
        setContentPane(panel);

        add(new TextMessage("Hey, man. What's up?", "Jnk1296", true));
        add(new TextMessage("Eh, nothing much.", "KeepJ96", false));
        add(new TextMessage("Wbu? Anything new going on with you?", "KeepJ96", false));

        add(new TextMessage("Nah, not really. Got a job interview coming up in a few " +
                                    "days, though. Sorta excited for that, but sorta not. " +
                                    "Other than that, life as usual. xD", "Jnk1296", true));

        add(new TextMessage("lol Sounds good.", "KeepJ96", false));
        add(new TextMessage("Yeah. How's the wife and kids, though?", "Jnk1296", true));
        add(new TextMessage("Sarah still griping at you to get the roof patched up?", "Jnk1296", true));
        add(new TextMessage("lol you could say that...", "KeepJ96", false));

        pack();
        setVisible(true);
    }

    public static void main(String[] args) {
        new NewMain();
    }
}

TextMessage对象（TextMessageContent的JPanel容器）：

public class TextMessage extends JPanel {

    private TextMessageContent content;

    public TextMessage(String sender, String message, boolean localMessage) {
        setBorder(new EmptyBorder(5, 5, 5, 5));

        if (localMessage) {
            setLayout(new FlowLayout(FlowLayout.RIGHT, 0, 0));
        } else {
            setLayout(new FlowLayout(FlowLayout.LEFT, 0, 0));
        }

        this.content = new TextMessageContent(sender, message, localMessage);
        add(content);
    }

    public TextMessageContent getContent() {
        return this.content;
    }
}

TextMessageContent类：（JTextPane）

public class TextMessageContent extends JTextPane {

private static final long serialVersionUID = -8296129524381168509L;
    private String sender;
    private String message;
    private boolean isClient;

    private Image background;

    public TextMessageContent(String message, String sender, boolean isClient) {
        // Define Data Points
        this.message = message;
        this.sender = sender;
        this.isClient = isClient;

        this.setEditable(false);
        this.setOpaque(false);
        this.setBorder(new EmptyBorder(7, 7, 7, 7));

        // Fetch Background Image (Hard Location Temporary)
        try {
            if (this.isClient) {
                background = ImageIO.read(
                        new File("/home/jacob/Desktop/orange.png"));
            } else {
                background = ImageIO.read(
                        new File("/home/jacob/Desktop/Green.png"));
            }
        } catch (Exception e) { return; }

        // Create Text Styles
        StyledDocument doc = getStyledDocument();

        // Create Default Base Style
        Style def = StyleContext.getDefaultStyleContext()
                .getStyle(StyleContext.DEFAULT_STYLE);
        Style regular = doc.addStyle("regular", def);

        // Create Body Style
        Style body = doc.addStyle("message", regular);
        StyleConstants.setFontFamily(body, "Verdana");
        StyleConstants.setFontSize(body, 12);

        // Create Sender Style
        Style foot = doc.addStyle("sender", body);
        StyleConstants.setFontSize(foot, 9);

        // Build Document
        try {
            doc.insertString(0, this.message + "\n", body);
            doc.insertString(doc.getLength(), this.sender + " - " +
                    getSystemTime(), foot);
        } catch (BadLocationException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void paintComponent(Graphics g) {
        background = ImageUtil.stretch(background, new Insets(5, 5, 5, 5),
                new Dimension(getWidth(), getHeight()),
                BufferedImage.TYPE_INT_ARGB);

        g.drawImage(background, 0, 0, null);
        super.paintComponent(g);
    }

    private String getSystemTime() {
        Calendar cal = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat("h:mm a");
        return sdf.format(cal.getTime());
    }
}

我已经阅读过简单地将JTextPane直接添加到容器等等，但是通过这个设置，JPanel环绕文本消息内容是必要的，以防止内容窗格的BoxLayout使文本消息填充整个小组。

有什么建议吗？

Answer 1

我已经阅读过简单地将JTextPane直接添加到容器等等，但是通过这种设置，JPanel环绕文本消息内容是必要的，以防止内容窗格的BoxLayout发出文本消息填写整个面板

不确定它是否有帮助，但BoxLayout会考虑添加到其中的组件的最大大小。也许您可以覆盖getMaximumSize()方法来控制宽度。宽度应该是首选宽度或父容器宽度的较小者。

JTextPane在JPanel中调整大小

1 个答案: