TextPane Hintergrund Color

Eine JTextPane-Komponente kann nicht nur eine Font-Farbänderung erhalten, sondern es kann auch die Hintergrundfarbe geändert werden.

Die Änderung der Farbe ist in meinem Beispielprogramm analog zum TextPane Font Color-Programm programmiert – mit der Ausnahme das die Änderung sich auf den gesamten Hintergrund bezieht und nicht auf eine selektierte Textstelle.

Die Hintergrundfarbe kann entweder über eine Combobox geändert werden (dort sind nur die vordefinierten Farben auswählbar) oder wir nutzen den Java-eigenen ColorChooser, der eine viel individuellere Farbauswahl ermöglicht.

Bitte beachtet jedoch, dass die Hintergrundfarbe nicht in der RTF-Datei gespeichert wird.

Hier sind die Quellcodes des Programms und der Form (Ihr benötigt intelliJ zur Nutzung):

/*
 * 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): 11.01.2020
 * Funktion: TextPane Background Color =
 *           formatiert den Hintergrund in der gewuenschten Textfarbe
 * Function: TextPane Font Color =
 *           format of background in choosen color
 *
 * 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.event.CaretEvent;
import javax.swing.event.CaretListener;
import javax.swing.text.*;
import javax.swing.text.rtf.RTFEditorKit;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.lang.reflect.Field;

public class TextPane {
    private JPanel panelMain;
    private JPanel panelButtons;
    private JButton buttonLoad;
    private JScrollPane scrollPane;
    private JTextPane textPane;
    private JButton buttonSave;
    private JButton buttonBackgroundColor;
    private JComboBox comboBoxBackgroundColor;
    private JButton buttonBackgroundColorColorChooser;
    private static String[] BACKGROUND_COLORS = new String[]{"WHITE", "BLACK", "RED", "GREEN", "BLUE", "CYAN", "MAGENTA", "YELLOW", "GRAY"};

    public TextPane() {

        textPane.setContentType("text/rtf");
        textPane.setEditorKit(new RTFEditorKit());

        // background color
        for (String str : BACKGROUND_COLORS) {
            comboBoxBackgroundColor.addItem(str);
        }

        buttonLoad.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent actionEvent) {
                loadRtf("textpane_rtf.rtf");
            }
        });
        buttonSave.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent actionEvent) {

                saveRtf("textpane_rtf.rtf");
            }
        });

        buttonBackgroundColor.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent actionEvent) {
                changeBackgroundColor();
            }
        });

        buttonBackgroundColorColorChooser.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent actionEvent) {
                changeBackgroundColorColorChooser();
            }
        });
    }

    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 Background Color");
        frame.setSize(550, 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.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 changeBackgroundColor() {
        String backgroundColor = String.valueOf(comboBoxBackgroundColor.getSelectedItem());
        Color color = null;
        try {
            Class cobj = ClassLoader.getSystemClassLoader().loadClass("java.awt.Color");
            Field field = cobj.getField(backgroundColor);
            color = (Color) field.get(cobj);
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        }
        textPane.setBackground(color);
        textPane.requestFocus();
    }

    private void changeBackgroundColorColorChooser() {
        Color color = JColorChooser.showDialog(null,
                "Farbauswahl", null);
        textPane.setBackground(color);
        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): 11.01.2020

* Funktion: TextPane Background Color =

* formatiert den Hintergrund in der gewuenschten Textfarbe

* Function: TextPane Font Color =

* format of background in choosen color

* 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.event.CaretEvent;

import javax.swing.event.CaretListener;

import javax.swing.text.*;

import javax.swing.text.rtf.RTFEditorKit;

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.*;

import java.lang.reflect.Field;

public class TextPane {

private JPanel panelMain;

private JPanel panelButtons;

private JButton buttonLoad;

private JScrollPane scrollPane;

private JTextPane textPane;

private JButton buttonSave;

private JButton buttonBackgroundColor;

private JComboBox comboBoxBackgroundColor;

private JButton buttonBackgroundColorColorChooser;

private static String[] BACKGROUND_COLORS = new String[]{"WHITE", "BLACK", "RED", "GREEN", "BLUE", "CYAN", "MAGENTA", "YELLOW", "GRAY"};

public TextPane() {

textPane.setContentType("text/rtf");

textPane.setEditorKit(new RTFEditorKit());

// background color

for (String str : BACKGROUND_COLORS) {

comboBoxBackgroundColor.addItem(str);

}

buttonLoad.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent actionEvent) {

loadRtf("textpane_rtf.rtf");

}

});

buttonSave.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent actionEvent) {

saveRtf("textpane_rtf.rtf");

}

});

buttonBackgroundColor.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent actionEvent) {

changeBackgroundColor();

}

});

buttonBackgroundColorColorChooser.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent actionEvent) {

changeBackgroundColorColorChooser();

}

});

}

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 Background Color");

frame.setSize(550, 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.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 changeBackgroundColor() {

String backgroundColor = String.valueOf(comboBoxBackgroundColor.getSelectedItem());

Color color = null;

try {

Class cobj = ClassLoader.getSystemClassLoader().loadClass("java.awt.Color");

Field field = cobj.getField(backgroundColor);

color = (Color) field.get(cobj);

} catch (SecurityException e) {

e.printStackTrace();

} catch (IllegalArgumentException e) {

e.printStackTrace();

} catch (ClassNotFoundException e) {

e.printStackTrace();

} catch (IllegalAccessException e) {

e.printStackTrace();

} catch (NoSuchFieldException e) {

e.printStackTrace();

}

textPane.setBackground(color);

textPane.requestFocus();

}

private void changeBackgroundColorColorChooser() {

Color color = JColorChooser.showDialog(null,

"Farbauswahl", null);

textPane.setBackground(color);

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="551" height="400"/>
    </constraints>
    <properties/>
    <border type="none"/>
    <children>
      <grid id="69623" binding="panelButtons" layout-manager="GridLayoutManager" row-count="1" column-count="5" 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>
              <text value="load"/>
            </properties>
          </component>
          <component id="1e556" class="javax.swing.JButton" binding="buttonSave">
            <constraints>
              <grid row="0" column="4" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
            </constraints>
            <properties>
              <text value="save"/>
            </properties>
          </component>
          <component id="26a30" class="javax.swing.JButton" binding="buttonBackgroundColor">
            <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>
              <text value="background color"/>
            </properties>
          </component>
          <component id="9c0b1" class="javax.swing.JComboBox" binding="comboBoxBackgroundColor">
            <constraints>
              <grid row="0" column="2" row-span="1" col-span="1" vsize-policy="0" hsize-policy="2" anchor="8" fill="1" indent="0" use-parent-layout="false"/>
            </constraints>
            <properties/>
          </component>
          <component id="33c78" class="javax.swing.JButton" binding="buttonBackgroundColorColorChooser">
            <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>
              <text value="ColorChooser"/>
            </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>

</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: 11.01.2020