Question

我已经找到了this主题，但是很遗憾，它不起作用。我正在尝试做的事情：我正在Java Swing的帮助下开发一个小工具。对于我工具中的某些功能，我想显示一个自己设计的工具提示以便提供一些信息。

这里是一个示例： Short text

这是我的设置：

JDialog
+-jPanel (transparent container) 
| +-jPanel (dark background for my text pane)
|   +-jTextPane
+-jLabel (holds the arrow image)

如果用户将鼠标悬停在小 i 上，则可以看到信息框。到目前为止，一切都很好。我为此信息框创建了一个类，仅设置了文本，使其在鼠标悬停时可见，并且在鼠标退出时不可见。

这就像一个护身符。如果我设置了另一个文本（在另一个 i 上以显示其他信息），则仅使用我的公共 setText 方法，然后再次将其设置为可见。请参见下图： Longer text, see auto height

图片具有相同的宽度，但具有另一个（自动）高度。现在，我的问题：我希望能够定义另一种宽度（与默认设置的宽度不同），以避免在文本较长的情况下将信息框设置得过高。但是，如果我这样做，我的信息框将失败，请参阅：

Long text with changed width, fail

这是我的代码（我通过Netbeans删除了自动生成的代码）：

import java.awt.BorderLayout;
import java.awt.Color;

public class MyToolTip extends javax.swing.JDialog {

    public MyToolTip(java.awt.Frame parent, boolean modal) {
        super(parent, modal);
        initComponents();
        makeMeTransparent();
    }

    public void setText (String text, Integer width) {
        String s;

        s  = "<html><body><p style=\"margin-top: 0; color: #ffffff; font-family:Tahoma; font-size:11px\">";
        s += text;
        s += "</p></body></html>";

        jTextPane_Tip.setText(s);

        if(width == 0) {
            width = 250;
        }

        setWidth(width);
        repaint();
        pack();
    }

    private void setWidth (Integer width) {        
        jTextPane_Tip.setSize(width, Integer.MAX_VALUE);
        jTextPane_Tip.setSize(width, jTextPane_Tip.getPreferredSize().height);
    }

    /* Netbeans auto generated code (hidden) */

    private void makeMeTransparent() {
        setBackground(new Color(0, 255, 0, 0));
        jPanel_Main.setBackground(new Color(0, 255, 0, 0));
        setContentPane(new MyContentPane());
        getContentPane().setBackground(Color.BLACK);
        setLayout(new BorderLayout());
        getContentPane().add(jPanel_Main);
    }
}

如何设置JTextPane的宽度并使用与文本相关的自动高度？

编辑：

这是我最小的例子：

文件MyTT.java：

package mytt;

public class MyTT {

    public static void main(String[] args) {
        NewJFrame frame = new NewJFrame();
        frame.setVisible(true);
    }
}

文件NewJFrame.java：

package mytt;

public class NewJFrame extends javax.swing.JFrame {

    private final MyToolTip tt;

    public NewJFrame() {
        initComponents();
        tt = new MyToolTip(this, false);
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jLabel1.setFont(new java.awt.Font("Tahoma", 0, 12)); // NOI18N
        jLabel1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        jLabel1.setText("Hover me for Tool-Tip (default width)");
        jLabel1.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseEntered(java.awt.event.MouseEvent evt) {
                jLabel1MouseEntered(evt);
            }
            public void mouseExited(java.awt.event.MouseEvent evt) {
                jLabel1MouseExited(evt);
            }
        });

        jLabel2.setFont(new java.awt.Font("Tahoma", 0, 12)); // NOI18N
        jLabel2.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        jLabel2.setText("Hover me for Tool-Tip (user defined width)");
        jLabel2.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseEntered(java.awt.event.MouseEvent evt) {
                jLabel2MouseEntered(evt);
            }
            public void mouseExited(java.awt.event.MouseEvent evt) {
                jLabel2MouseExited(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(jLabel2, javax.swing.GroupLayout.DEFAULT_SIZE, 280, Short.MAX_VALUE))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jLabel1)
                .addGap(108, 108, 108)
                .addComponent(jLabel2)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>                        

    private void jLabel1MouseEntered(java.awt.event.MouseEvent evt) {                                     
        int x = jLabel1.getLocationOnScreen().x + jLabel1.getWidth() + 4;
        int y = jLabel1.getLocationOnScreen().y;   

        tt.setText("This is a simple example text. The width isn't changed and the height will be automatically set.",0);
        tt.setLocation(x,y);
        tt.setVisible(true);
    }                                    

    private void jLabel2MouseEntered(java.awt.event.MouseEvent evt) {                                     
        int x = jLabel2.getLocationOnScreen().x + jLabel1.getWidth() + 4;
        int y = jLabel2.getLocationOnScreen().y;   

        tt.setText("This is a simple example text. I set the width to a user defined value. This will crash the box somehow",400);
        tt.setLocation(x,y);
        tt.setVisible(true);
    }                                    

    private void jLabel1MouseExited(java.awt.event.MouseEvent evt) {                                    
        tt.setVisible(false);
    }                                   

    private void jLabel2MouseExited(java.awt.event.MouseEvent evt) {                                    
        tt.setVisible(false);
    }                                   

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(() -> {
            new NewJFrame().setVisible(true);
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    // End of variables declaration                   
}

文件MyToolTip.java：

package mytt;

public class MyToolTip extends javax.swing.JDialog {

    public MyToolTip(java.awt.Frame parent, boolean modal) {
        super(parent, modal);
        initComponents();
    }

    public void setText (String text, Integer width) {     
        jTextPane_Tip.setText(text);

        // if the user doesn't defined a width, take the default width
        if(width == 0) width = 150;

        // resize the box
        setWidth(width);
    }

    private void setWidth (Integer width) {        
        jTextPane_Tip.setSize(width, Integer.MAX_VALUE);
        jTextPane_Tip.setSize(width, jTextPane_Tip.getPreferredSize().height);
        pack();
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jPanel_Main = new javax.swing.JPanel();
        jPanel_Background = new javax.swing.JPanel();
        jTextPane_Tip = new javax.swing.JTextPane();

        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
        setTitle("Variable Platzhalter");
        setFocusableWindowState(false);
        setUndecorated(true);
        addKeyListener(new java.awt.event.KeyAdapter() {
            public void keyPressed(java.awt.event.KeyEvent evt) {
                formKeyPressed(evt);
            }
        });

        jPanel_Background.setBackground(new java.awt.Color(29, 29, 29));

        jTextPane_Tip.setEditable(false);
        jTextPane_Tip.setBackground(new java.awt.Color(29, 29, 29));
        jTextPane_Tip.setFont(new java.awt.Font("Tahoma", 0, 12)); // NOI18N
        jTextPane_Tip.setForeground(new java.awt.Color(255, 255, 255));
        jTextPane_Tip.setText("");

        javax.swing.GroupLayout jPanel_BackgroundLayout = new javax.swing.GroupLayout(jPanel_Background);
        jPanel_Background.setLayout(jPanel_BackgroundLayout);
        jPanel_BackgroundLayout.setHorizontalGroup(
            jPanel_BackgroundLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel_BackgroundLayout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jTextPane_Tip, javax.swing.GroupLayout.DEFAULT_SIZE, 150, Short.MAX_VALUE)
                .addContainerGap())
        );
        jPanel_BackgroundLayout.setVerticalGroup(
            jPanel_BackgroundLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel_BackgroundLayout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jTextPane_Tip)
                .addContainerGap())
        );

        javax.swing.GroupLayout jPanel_MainLayout = new javax.swing.GroupLayout(jPanel_Main);
        jPanel_Main.setLayout(jPanel_MainLayout);
        jPanel_MainLayout.setHorizontalGroup(
            jPanel_MainLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel_MainLayout.createSequentialGroup()
                .addGap(0, 0, 0)
                .addComponent(jPanel_Background, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        jPanel_MainLayout.setVerticalGroup(
            jPanel_MainLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel_Background, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );

        getContentPane().add(jPanel_Main, java.awt.BorderLayout.CENTER);

        pack();
        setLocationRelativeTo(null);
    }// </editor-fold>                        

    private void formKeyPressed(java.awt.event.KeyEvent evt) {                                
        this.dispose();
    }                               

    public static void main(String args[]) {
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(MyToolTip.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        /* Create and display the dialog */
        java.awt.EventQueue.invokeLater(() -> {
            MyToolTip dialog = new MyToolTip(new javax.swing.JFrame(), true);
            dialog.addWindowListener(new java.awt.event.WindowAdapter() {
                @Override
                public void windowClosing(java.awt.event.WindowEvent e) {
                    System.exit(0);
                }
            });
            dialog.setVisible(true);
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JPanel jPanel_Background;
    private javax.swing.JPanel jPanel_Main;
    private javax.swing.JTextPane jTextPane_Tip;
    // End of variables declaration                   
}

最小示例的结果： Okay, no user defined width Fail, with user defined width

编辑2：

好的第二次尝试：这是我自己编写的一个最小示例（没有从Netbeans自动生成的代码）。我希望这是最小的要求。现在是个好消息：该程序的运行完全符合我的期望（同样来自我的真实项目）。

MCVE.java：软件包mcve;

import java.awt.Dimension;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class MCVE {

    public static void main(String[] args) {

        MyToolTip tt = new MyToolTip(null,false);
        JFrame f = new JFrame();
        JLabel l1 = new JLabel("Please hover me (default size)");
        JLabel l2 = new JLabel("Please hover me (defined size)");
        JPanel p = new JPanel();

        l1.addMouseListener(new MouseAdapter() {

            @Override
            public void mouseEntered(MouseEvent evt) {
                int x = l1.getLocationOnScreen().x + l1.getWidth() + 4;
                int y = l1.getLocationOnScreen().y;   

                tt.setText("Lorem ipsum dolor sit amet, consetetur sadipscing elitr",200);
                tt.setLocation(x,y);
                tt.setVisible(true);
            }

            @Override
            public void mouseExited(MouseEvent evt) {
                tt.setVisible(false);
            }
        });

        l2.addMouseListener(new MouseAdapter() {

            @Override
            public void mouseEntered(MouseEvent evt) {
                int x = l2.getLocationOnScreen().x + l2.getWidth() + 4;
                int y = l2.getLocationOnScreen().y;   

                tt.setText("Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.",300);
                tt.setLocation(x,y);
                tt.setVisible(true);
            }

            @Override
            public void mouseExited(MouseEvent evt) {
                tt.setVisible(false);
            }
        });

        p.add(l1);
        p.add(l2);
        p.setPreferredSize(new Dimension(200,50));

        f.add(p);
        f.pack();
        f.setLocationRelativeTo(null);       
        f.setVisible(true);
    }
}

MyToolTip.java：

package mcve;

import java.awt.Dimension;
import javax.swing.JPanel;
import javax.swing.JTextPane;

public class MyToolTip extends javax.swing.JDialog { 
    private JPanel p;
    private JTextPane tp;

    public MyToolTip(java.awt.Frame parent, boolean modal) {
        super(parent, modal);
        initComp();
    }

    public void setText(String text, Integer width) {
        tp.setText(text);

        if(width > 0) {
            tp.setSize(width, Integer.MAX_VALUE);
            tp.setPreferredSize(new Dimension(width, tp.getPreferredSize().height));
        }

        pack();
    }

    private void initComp () {
        p = new JPanel();
        tp = new JTextPane();
        p.add(tp);
        add(p);
    }
}

现在的问题是：为什么在我的第二个最小示例中却不能在我的项目中使用：-（

Answer 1

在setWidth(Integer)类的MyToolTip方法中，您两次调用jTextPane_Tip.setSize()。当我删除第一个电话

jTextPane_Tip.setSize(width, Integer.MAX_VALUE);

有效。

如何设置JTextPane的宽度并使用与文本相关的自动高度？

1 个答案: