TextPane Editierbar und Sichtbar

Die JTextPane-Komponente kann recht einfach in einen „Lesemodus“ umgeschaltet werden. Ebenso einfach ist es, die Komponente vom umgebenden JFrame oder JPanel verschwinden zu lassen – z.B. wenn unliebsame Mitleser auf den Bildschirm schauen.

Direkt nach dem Start erscheint die TextPane mit einem roten Rahmen („Border“), der uns anzeigt das die TextPane im Lesemodus ist:

Damit das funktioniert ist in der Dateiladeroutine diese Zeile hinzuzufügen (sonst wird der Cursor später nicht mehr angezeigt):

textPane.getCaret().setSelectionVisible(true);

1	textPane.getCaret().setSelectionVisible(true);

Die eigentliche Arbeit erfolgt in den beiden Zeilen:

textPane.setEditable(false);
scrollPane.setBorder(BorderFactory.createLineBorder(Color.RED));

1 2	textPane.setEditable(false); scrollPane.setBorder(BorderFactory.createLineBorder(Color.RED));

Nach Betätigung des „editable“ Buttons wird eine Umschalt- (Toggle-) Funktion aufgerufen und der rote Rahmen wird zu einem schwarzen Rahmen – nun könnt Ihr den Inhalt des TextPane editieren:

Der Klick auf den „visible“-Button läßt mit diesem Programmcode die TextPane verschwinden:

textPane.setVisible(!textPane.isVisible());

1	textPane.setVisible(!textPane.isVisible());

Hier die Quellcodes des Programms und der Form – wie immer benötigt Ihr intelliJ IDEA zum Nachprogrammieren:

/*
 * Herkunft/Origin: http://java-crypto.bplaced.net/
 * Programmierer/Programmer: Michael Fehr
 * Copyright/Copyright: frei verwendbares Programm (Public Domain)
 * Copyright: This is free and unencumbered software released into the public domain.
 * Lizenttext/Licence: <http://unlicense.org>
 * getestet mit/tested with: Java Runtime Environment 11.0.5 x64
 * verwendete IDE/used IDE: intelliJ IDEA 2019.3.1
 * Datum/Date (dd.mm.jjjj): 15.01.2020
 * Funktion: TextPane Editierbar und Sichtbar =
 *           Editierbarkeit und Sichtbarkeit umschalten
 * Function: TextPane editable and visible =
 *           toggle for editable and visible of the textpane
 *
 * Hinweis/Notice
 * Sie benoetigen intelliJ um das Programm uebersetzen und ausfuehren zu koennen
 * You need intelliJ to build and run the program
 */

import javax.swing.*;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.StyleContext;
import javax.swing.text.StyledDocument;
import javax.swing.text.rtf.RTFEditorKit;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;

public class TextPane extends JFrame {
    private JPanel panelMain;
    private JPanel panelButtons;
    private JButton buttonLoad;
    private JScrollPane scrollPane;
    private JTextPane textPane;
    private JButton buttonSave;
    private JButton buttonEdit;
    private JButton buttonVisible;

    public TextPane() {

        textPane.setContentType("text/rtf");
        textPane.setEditorKit(new RTFEditorKit());
        scrollPane.setBorder(BorderFactory.createLineBorder(Color.BLACK));

        buttonLoad.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent actionEvent) {
                loadRtf("textpane_rtf.rtf");
                textPane.getCaret().setSelectionVisible(true);
                textPane.requestFocus();
            }
        });
        buttonSave.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent actionEvent) {
                saveRtf("textpane_rtf.rtf");
                textPane.requestFocus();
            }
        });

        buttonEdit.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent actionEvent) {
                toggleEditable();
            }
        });
        buttonVisible.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent actionEvent) {
                toggleVisible();
            }
        });
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setContentPane(new TextPane().panelMain);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setTitle("TextPane Editable & Visible");
        frame.setSize(500, 300);
        frame.setVisible(true);
    }

    public void loadRtf(String filename) {
        RTFEditorKit RTF_KIT = new RTFEditorKit();
        textPane.setContentType("text/rtf");
        InputStream inputStream;
        try {
            inputStream = new FileInputStream(filename);
            final DefaultStyledDocument styledDocument = new DefaultStyledDocument(new StyleContext());
            RTF_KIT.read(inputStream, styledDocument, 0);
            textPane.setDocument(styledDocument);
            // delete added last line
            String content = textPane.getDocument().getText(0, textPane.getDocument().getLength());
            int lastLineBreak = content.lastIndexOf('\n');
            textPane.getDocument().remove(lastLineBreak, textPane.getDocument().getLength() - lastLineBreak);
        } catch (IOException | BadLocationException e) {
            e.printStackTrace();
        }
        textPane.setEditable(false);
        scrollPane.setBorder(BorderFactory.createLineBorder(Color.RED));
        textPane.setVisible(true);
        textPane.requestFocus();
    }

    public void saveRtf(String filename) {
        try {
            FileOutputStream fos = new FileOutputStream(filename);
            RTFEditorKit kit = (RTFEditorKit) textPane.getEditorKit();
            StyledDocument doc = textPane.getStyledDocument();
            int len = doc.getLength();
            kit.write(fos, doc, 0, len);
            fos.close();
        } catch (IOException | BadLocationException e) {
            e.printStackTrace();
        }
        textPane.requestFocus();
    }

    private void toggleEditable(){
        textPane.setEditable(!textPane.isEditable());
        if (textPane.isEditable() == true) {
            scrollPane.setBorder(BorderFactory.createLineBorder(Color.BLACK));
        } else {
            scrollPane.setBorder(BorderFactory.createLineBorder(Color.RED));
        }
        textPane.requestFocus();
    }

    private void toggleVisible(){
        textPane.setVisible(!textPane.isVisible());
        textPane.requestFocus();
    }
}

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* Herkunft/Origin: http://java-crypto.bplaced.net/

* Programmierer/Programmer: Michael Fehr

* Copyright/Copyright: frei verwendbares Programm (Public Domain)

* Copyright: This is free and unencumbered software released into the public domain.

* Lizenttext/Licence: <http://unlicense.org>

* getestet mit/tested with: Java Runtime Environment 11.0.5 x64

* verwendete IDE/used IDE: intelliJ IDEA 2019.3.1

* Datum/Date (dd.mm.jjjj): 15.01.2020

* Funktion: TextPane Editierbar und Sichtbar =

* Editierbarkeit und Sichtbarkeit umschalten

* Function: TextPane editable and visible =

* toggle for editable and visible of the textpane

* Hinweis/Notice

* Sie benoetigen intelliJ um das Programm uebersetzen und ausfuehren zu koennen

* You need intelliJ to build and run the program

import javax.swing.*;

import javax.swing.text.BadLocationException;

import javax.swing.text.DefaultStyledDocument;

import javax.swing.text.StyleContext;

import javax.swing.text.StyledDocument;

import javax.swing.text.rtf.RTFEditorKit;

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.*;

public class TextPane extends JFrame {

private JPanel panelMain;

private JPanel panelButtons;

private JButton buttonLoad;

private JScrollPane scrollPane;

private JTextPane textPane;

private JButton buttonSave;

private JButton buttonEdit;

private JButton buttonVisible;

public TextPane() {

textPane.setContentType("text/rtf");

textPane.setEditorKit(new RTFEditorKit());

scrollPane.setBorder(BorderFactory.createLineBorder(Color.BLACK));

buttonLoad.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent actionEvent) {

loadRtf("textpane_rtf.rtf");

textPane.getCaret().setSelectionVisible(true);

textPane.requestFocus();

}

});

buttonSave.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent actionEvent) {

saveRtf("textpane_rtf.rtf");

textPane.requestFocus();

}

});

buttonEdit.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent actionEvent) {

toggleEditable();

}

});

buttonVisible.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent actionEvent) {

toggleVisible();

}

});

}

public static void main(String[] args) {

JFrame frame = new JFrame();

frame.setContentPane(new TextPane().panelMain);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.pack();

frame.setTitle("TextPane Editable & Visible");

frame.setSize(500, 300);

frame.setVisible(true);

}

public void loadRtf(String filename) {

RTFEditorKit RTF_KIT = new RTFEditorKit();

textPane.setContentType("text/rtf");

InputStream inputStream;

try {

inputStream = new FileInputStream(filename);

final DefaultStyledDocument styledDocument = new DefaultStyledDocument(new StyleContext());

RTF_KIT.read(inputStream, styledDocument, 0);

textPane.setDocument(styledDocument);

// delete added last line

String content = textPane.getDocument().getText(0, textPane.getDocument().getLength());

int lastLineBreak = content.lastIndexOf('\n');

textPane.getDocument().remove(lastLineBreak, textPane.getDocument().getLength() - lastLineBreak);

} catch (IOException | BadLocationException e) {

e.printStackTrace();

}

textPane.setEditable(false);

scrollPane.setBorder(BorderFactory.createLineBorder(Color.RED));

textPane.setVisible(true);

textPane.requestFocus();

}

public void saveRtf(String filename) {

try {

FileOutputStream fos = new FileOutputStream(filename);

RTFEditorKit kit = (RTFEditorKit) textPane.getEditorKit();

StyledDocument doc = textPane.getStyledDocument();

int len = doc.getLength();

kit.write(fos, doc, 0, len);

fos.close();

} catch (IOException | BadLocationException e) {

e.printStackTrace();

}

textPane.requestFocus();

}

private void toggleEditable(){

textPane.setEditable(!textPane.isEditable());

if (textPane.isEditable() == true) {

scrollPane.setBorder(BorderFactory.createLineBorder(Color.BLACK));

} else {

scrollPane.setBorder(BorderFactory.createLineBorder(Color.RED));

}

textPane.requestFocus();

}

private void toggleVisible(){

textPane.setVisible(!textPane.isVisible());

textPane.requestFocus();

}

<?xml version="1.0" encoding="UTF-8"?>
<form xmlns="http://www.intellij.com/uidesigner/form/" version="1" bind-to-class="TextPane">
  <grid id="27dc6" binding="panelMain" layout-manager="GridLayoutManager" row-count="2" column-count="1" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
    <margin top="10" left="10" bottom="10" right="10"/>
    <constraints>
      <xy x="20" y="20" width="500" height="400"/>
    </constraints>
    <properties/>
    <border type="none"/>
    <children>
      <grid id="69623" binding="panelButtons" layout-manager="GridLayoutManager" row-count="1" column-count="4" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
        <margin top="0" left="0" bottom="0" right="0"/>
        <constraints>
          <grid row="0" column="0" row-span="1" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
        </constraints>
        <properties/>
        <border type="none"/>
        <children>
          <component id="b1559" class="javax.swing.JButton" binding="buttonLoad">
            <constraints>
              <grid row="0" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
            </constraints>
            <properties>
              <actionCommand value="load"/>
              <label value="load"/>
              <text value="load"/>
            </properties>
          </component>
          <component id="1e556" class="javax.swing.JButton" binding="buttonSave">
            <constraints>
              <grid row="0" column="3" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
            </constraints>
            <properties>
              <label value="save"/>
              <text value="save"/>
            </properties>
          </component>
          <component id="ee5d5" class="javax.swing.JButton" binding="buttonEdit">
            <constraints>
              <grid row="0" column="1" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
            </constraints>
            <properties>
              <actionCommand value="editable"/>
              <label value="editable"/>
              <text value="editable"/>
            </properties>
          </component>
          <component id="cab99" class="javax.swing.JButton" binding="buttonVisible">
            <constraints>
              <grid row="0" column="2" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
            </constraints>
            <properties>
              <actionCommand value="visible w"/>
              <label value="visible w"/>
              <text value="visible w"/>
            </properties>
          </component>
        </children>
      </grid>
      <scrollpane id="5bf0e" binding="scrollPane">
        <constraints>
          <grid row="1" column="0" row-span="1" col-span="1" vsize-policy="7" hsize-policy="7" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
        </constraints>
        <properties/>
        <border type="none"/>
        <children>
          <component id="100bc" class="javax.swing.JTextPane" binding="textPane">
            <constraints/>
            <properties/>
          </component>
        </children>
      </scrollpane>
    </children>
  </grid>
</form>

<?xml version="1.0" encoding="UTF-8"?>

</constraints>

</constraints>

</constraints>

</properties>

</component>

</constraints>

</properties>

</component>

</constraints>

</properties>

</component>

</constraints>

</properties>

</component>

</children>

</grid>

</constraints>

</component>

</children>

</scrollpane>

</children>

</grid>

</form>

Alle Quellcodes zur JTextPane findet Ihr zum Download in meinem Github-Repository, welches Ihr über diesen Link erreicht: https://github.com/java-crypto/JTextPane. Alle Programme sind unter Java 11 lauffähig (vermutlich auch unter Java 8) und wurden mit intelliJ IDEA entwickelt, welches für das eigene „Spielen“ notwendig ist.

Die Lizenz zum obigen Beispiel findet Ihr auf der eigenen Lizenz-Seite.

Letzte Bearbeitung: 19.01.2020