java - 如何解决boxlayout中的错位？

Question

我正在尝试在带有 Box 布局的 Jpanel 中添加多个 Jlabel，但是我在设置它们的 setAlignmentX() 时遇到了问题。我正在引用此文本气泡边框站点的示例，并尝试从中提取一些示例。然后将 jpanel 添加到 Jscrollpane 中。

我的代码在这里!!!

//Source :Andrew Thompson

 class TextBubbleBorder extends AbstractBorder {
 private Color color;
 private int thickness = 4;
 private int radii = 8;
private int pointerSize = 7;
private Insets insets = null;
private BasicStroke stroke = null;
private int strokePad;
private int pointerPad = 4;
private boolean left = true;
RenderingHints hints;

TextBubbleBorder(
        Color color) {
    new TextBubbleBorder(color, 4, 8, 7);
}

TextBubbleBorder(
        Color color, int thickness, int radii, int pointerSize) {
    this.thickness = thickness;
    this.radii = radii;
    this.pointerSize = pointerSize;
    this.color = color;

    stroke = new BasicStroke(thickness);
    strokePad = thickness / 2;

    hints = new RenderingHints(
            RenderingHints.KEY_ANTIALIASING,
            RenderingHints.VALUE_ANTIALIAS_ON);

    int pad = radii + strokePad;
    int bottomPad = pad + pointerSize + strokePad;
    insets = new Insets(pad, pad, bottomPad, pad);
}

TextBubbleBorder(
        Color color, int thickness, int radii, int pointerSize, boolean left) {
    this(color, thickness, radii, pointerSize);
    this.left = left;
}

@Override
public Insets getBorderInsets(Component c) {
    return insets;
}

@Override
public Insets getBorderInsets(Component c, Insets insets) {
    return getBorderInsets(c);
}

@Override
public void paintBorder(
        Component c,
        Graphics g,
        int x, int y,
        int width, int height) {

    Graphics2D g2 = (Graphics2D) g;

    int bottomLineY = height - thickness - pointerSize;

    RoundRectangle2D.Double bubble = new RoundRectangle2D.Double(
            0 + strokePad,
            0 + strokePad,
            width - thickness,
            bottomLineY,
            radii,
            radii);

    Polygon pointer = new Polygon();

    if (left) {
        // left point
        pointer.addPoint(
                strokePad + radii + pointerPad,
                bottomLineY);
        // right point
        pointer.addPoint(
                strokePad + radii + pointerPad + pointerSize,
                bottomLineY);
        // bottom point
        pointer.addPoint(
                strokePad + radii + pointerPad + (pointerSize / 2),
                height - strokePad);
    } else {
        // left point
        pointer.addPoint(
                width - (strokePad + radii + pointerPad),
                bottomLineY);
        // right point
        pointer.addPoint(
                width - (strokePad + radii + pointerPad + pointerSize),
                bottomLineY);
        // bottom point
        pointer.addPoint(
                width - (strokePad + radii + pointerPad + (pointerSize / 2)),
                height - strokePad);
    }

    Area area = new Area(bubble);
    area.add(new Area(pointer));

    g2.setRenderingHints(hints);

    // Paint the BG color of the parent, everywhere outside the clip
    // of the text bubble.
    Component parent  = c.getParent();
    if (parent!=null) {
        Color bg = parent.getBackground();
        Rectangle rect = new Rectangle(0,0,width, height);
        Area borderRegion = new Area(rect);
        borderRegion.subtract(area);
        g2.setClip(borderRegion);
        g2.setColor(bg);
        g2.fillRect(0, 0, width, height);
        g2.setClip(null);
    }

    g2.setColor(color);
    g2.setStroke(stroke);
    g2.draw(area);
}}

 //TextBubbleBorder ends here

Msgbox 从这里开始

class msgbox extends JPanel {

    boolean ij = true;
    String msg = "";
    JLabel jl;

    msgbox() {
        //  msgpnl();
    }

    msgbox(String str, boolean bj) {
        ij = bj;
        msg = str;
        msgpnl();
    }
    /* public void setText(String str, boolean  bj){
     ij=bj;
     msg=str;
     msgpnl();
     }
     */

    public void msgpnl() {
        //setLayout(new GridLayout(0, 1));
        this.setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
        if (ij) {
            jl = new JLabel(msg);

            jl.setOpaque(true);
            jl.setBorder(new TextBubbleBorder(Color.LIGHT_GRAY, 1, 10, 7, ij));

            jl.setBackground(new Color(123, 104, 238));
            jl.setAlignmentX(0);
        } else {
            jl = new JLabel(msg, SwingConstants.RIGHT);

            jl.setOpaque(true);
            jl.setBorder(new TextBubbleBorder(Color.LIGHT_GRAY, 1, 10, 7, ij));

            jl.setBackground(new Color(224, 102, 255));
            jl.setAlignmentX(1);
        }
        this.add(jl);
        System.out.print("\nThis executed");
    }
}

聊天面板

class chatpanel extends JScrollPane {

    static JPanel jp;

    chatpanel() {
        this.setVisible(true);
        //this.setLayout(null);
        this.jp = new JPanel();
        this.jp.setLayout(new BoxLayout(this.jp, BoxLayout.Y_AXIS));
        //jp= new JPanel( new GridLayout(0, 1,0,5));
        //this.setLayout(new GridLayout(1,1));
        this.getViewport().add(jp);
        jp.setVisible(true);
        setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED);
        setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
    }

    public void addmsg(Component co) {
        //msgscp.add(co);
        //co.setSize(100, 30);
        jp.add(co);
    }

    public static void main(String args[]) {
        JFrame jf = new JFrame("Testing msgpanel");
        jf.setLayout(new GridLayout(0, 1, 0, 0));
        chatpanel cp = new chatpanel();
        JButton jb = new JButton("new");
        msgbox mb;
        mb = new msgbox("<html><body style='width: 200px; padding: 5px;'>"
                + "<h1>Do U C Me?</h1>"
                + "Here is a long string that will wrap.  "
                + "The effect we want is a multi-line label.", true);
        // mb.setText();
        cp.addmsg(mb);
        msgbox mb2 = new msgbox("Hello 2", false);
        cp.addmsg(mb2);
        jb.setSize(100, 30);
        jf.add(cp);
        //jf.add(jb);
        jf.setSize(400, 400);
        //jf.pack();
        jf.setVisible(true);
    }
}

另外，尽管我在聊天面板中使用了 HTML 包装技术，但我认为在 Jlabel 中包装文本时会遇到问题。改变 msgboxes 的大小不会有效!!在此先感谢您的帮助!!

Answer 1

only in due all my respect to @Andrew Thompson :-) and my curiosity

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.EventQueue;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ScrollPaneConstants;

public class ChatPanel {

    private JFrame jf = new JFrame("Testing msgpanel");
    private JScrollPane scroll = new JScrollPane();
    private JPanel jp;
    private ChatPaneMsgBox mb;
    private ChatPaneMsgBox mb2;
    private JPanel cp = new JPanel();
    private JButton jb = new JButton("  ME !!! ");
    private JButton jb1 = new JButton("  YOU !!! ");

    public ChatPanel() {
        jp = new JPanel();
        jp.setLayout(new BoxLayout(jp, BoxLayout.Y_AXIS));
        mb = new ChatPaneMsgBox("<html><body style='width: 200px; padding: 5px;'>"
                + "<h1>Do U C Me?</h1>"
                + "Here is a long string that will wrap.  "
                + "The effect we want is a multi-line label.", true);
        addmsg(mb);
        mb2 = new ChatPaneMsgBox("Hello 2", false);
        addmsg(mb2);
        scroll.setViewportView(jp);
        scroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED);
        scroll.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
        jb.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                mb = new ChatPaneMsgBox("<html><body style='width: 200px; padding: 5px;'>"
                        + "<h1>Do U C Me?</h1>"
                        + "Here is a long string that will wrap.  "
                        + "The effect we want is a multi-line label.", true);
                addmsg(mb);
                Rectangle rect = jp.getBounds();
                Rectangle r2 = scroll.getViewport().getVisibleRect();
                jp.scrollRectToVisible(new Rectangle((int) rect.getWidth(), 
                        (int) rect.getHeight(), (int) r2.getWidth(), (int) r2.getHeight()));
            }
        });
        jb1.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                mb2 = new ChatPaneMsgBox("Hello 2", false);
                addmsg(mb2);
                Rectangle rect = jp.getBounds();
                Rectangle r2 = scroll.getViewport().getVisibleRect();
                jp.scrollRectToVisible(new Rectangle((int) rect.getWidth(), 
                        (int) rect.getHeight(), (int) r2.getWidth(), (int) r2.getHeight()));
            }
        });
        cp.add(jb);
        cp.add(jb1);
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jf.add(scroll);
        jf.add(cp, BorderLayout.SOUTH);
        jf.setSize(400, 400);
        jf.setVisible(true);
    }

    private void addmsg(Component co) {
        jp.add(co);
        jp.revalidate();
        jp.repaint();
    }

    public static void main(String args[]) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new ChatPanel();
            }
        });
    }
}

.

import java.awt.Color;
import javax.swing.BoxLayout;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingConstants;

class ChatPaneMsgBox extends JPanel {

    boolean ij = true;
    private String msg = "";
    private JLabel jl;

    public ChatPaneMsgBox() {
    }

    public ChatPaneMsgBox(String str, boolean bj) {
        ij = bj;
        msg = str;
        msgpnl();
    }

    private void msgpnl() {
        this.setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
        if (ij) {
            jl = new JLabel(msg);

            jl.setOpaque(true);
            jl.setBorder(new TextBubbleBorder(Color.LIGHT_GRAY, 1, 10, 7, ij));

            jl.setBackground(new Color(123, 104, 238));
            jl.setAlignmentX(0);
        } else {
            jl = new JLabel(msg, SwingConstants.RIGHT);

            jl.setOpaque(true);
            jl.setBorder(new TextBubbleBorder(Color.LIGHT_GRAY, 1, 10, 7, ij));

            jl.setBackground(new Color(224, 102, 255));
            jl.setAlignmentX(1);
        }
        this.add(jl);
        System.out.print("\nThis executed");
    }
}

.

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Polygon;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.geom.Area;
import java.awt.geom.RoundRectangle2D;
import javax.swing.border.AbstractBorder;

class TextBubbleBorder extends AbstractBorder {

    private Color color;
    private int thickness = 4;
    private int radii = 8;
    private int pointerSize = 7;
    private Insets insets = null;
    private BasicStroke stroke = null;
    private int strokePad;
    private int pointerPad = 4;
    private boolean left = true;
    RenderingHints hints;

    TextBubbleBorder(Color color) {
        new TextBubbleBorder(color, 4, 8, 7);
    }

    TextBubbleBorder(Color color, int thickness, int radii, int pointerSize) {
        this.thickness = thickness;
        this.radii = radii;
        this.pointerSize = pointerSize;
        this.color = color;
        stroke = new BasicStroke(thickness);
        strokePad = thickness / 2;
        hints = new RenderingHints(RenderingHints.KEY_ANTIALIASING, 
                RenderingHints.VALUE_ANTIALIAS_ON);
        int pad = radii + strokePad;
        int bottomPad = pad + pointerSize + strokePad;
        insets = new Insets(pad, pad, bottomPad, pad);
    }

    TextBubbleBorder(Color color, int thickness, int radii, int pointerSize, boolean left) {
        this(color, thickness, radii, pointerSize);
        this.left = left;
    }

    @Override
    public Insets getBorderInsets(Component c) {
        return insets;
    }

    @Override
    public Insets getBorderInsets(Component c, Insets insets) {
        return getBorderInsets(c);
    }

    @Override
    public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
        Graphics2D g2 = (Graphics2D) g;
        int bottomLineY = height - thickness - pointerSize;
        RoundRectangle2D.Double bubble = new RoundRectangle2D.Double(
                0 + strokePad,
                0 + strokePad,
                width - thickness,
                bottomLineY,
                radii,
                radii);
        Polygon pointer = new Polygon();
        if (left) {
            // left point
            pointer.addPoint(
                    strokePad + radii + pointerPad,
                    bottomLineY);
            // right point
            pointer.addPoint(
                    strokePad + radii + pointerPad + pointerSize,
                    bottomLineY);
            // bottom point
            pointer.addPoint(
                    strokePad + radii + pointerPad + (pointerSize / 2),
                    height - strokePad);
        } else {
            // left point
            pointer.addPoint(
                    width - (strokePad + radii + pointerPad),
                    bottomLineY);
            // right point
            pointer.addPoint(
                    width - (strokePad + radii + pointerPad + pointerSize),
                    bottomLineY);
            // bottom point
            pointer.addPoint(
                    width - (strokePad + radii + pointerPad + (pointerSize / 2)),
                    height - strokePad);
        }
        Area area = new Area(bubble);
        area.add(new Area(pointer));
        g2.setRenderingHints(hints);
        // Paint the BG color of the parent, everywhere outside the clip
        // of the text bubble.
        Component parent = c.getParent();
        if (parent != null) {
            Color bg = parent.getBackground();
            Rectangle rect = new Rectangle(0, 0, width, height);
            Area borderRegion = new Area(rect);
            borderRegion.subtract(area);
            g2.setClip(borderRegion);
            g2.setColor(bg);
            g2.fillRect(0, 0, width, height);
            g2.setClip(null);
        }
        g2.setColor(color);
        g2.setStroke(stroke);
        g2.draw(area);
    }
}