TextPane Font Color – JavaCrypto

Eine weitere Textformatierung betrifft die Textfarbe. Auch diese Formatierung wird über die Selektion eines Textbereiches vorbereitet und anschließend mittels der StyleConstants verändert.

Im Beispielprogramm kann die Schriftfarbe über 2 Quellen verändert werden: zum Einen habe ich eine JComboBox mit einer Basis-Farbauswahl vorbereitet , die gewünschte Farbe wird aus der Liste ausgewählt und dann mit Druck auf den Button „font color“ der Methode „private void changeStyleFontColor(String color)“ übergeben.

Die zweite Farbauswahl erfolgt über den Button „ColorChooser“, der einen jColorChooserDialog aufruft. Der erhaltene Wert wird an die Methode „private void changeStyleFontColorCc(Color color)“ weitergereicht.

Hier ist ein Screenshot der fertigen Anwendung (wie immer benötigt Ihr intelliJ für den Nachbau).

Hier nun der Sourcecode:

/*
 * 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): 02.01.2020
 * Funktion: TextPane Font Color =
 *           formatiert selektierten Text in der gewuenschten Textfarbe
 * Function: TextPane Font Color =
 *           format of selected text 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 buttonFontColor;
    private JComboBox comboBoxFontColor;
    private JButton buttonFontColorColorChooser;
    private static String[] FONT_COLORS = new String[]{"BLACK", "RED", "GREEN", "BLUE", "CYAN", "MAGENTA", "YELLOW", "GRAY"};
    private int selectionStart, selectionEnd;
    private AttributeSet selectedAttribute;

    public TextPane() {

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

        // font color
        for (String str : FONT_COLORS) {
            comboBoxFontColor.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");
            }
        });

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

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

        // notwendig für selections
        textPane.addCaretListener(new CaretListener() { // achtet auf selektion
            @Override
            public void caretUpdate(CaretEvent caretEvent) {
                selectionStart = textPane.getSelectionStart();
                selectionEnd = textPane.getSelectionEnd();
                StyledDocument doc = textPane.getStyledDocument();
                selectedAttribute = doc.getCharacterElement(selectionStart).getAttributes();
                selectionStart = textPane.getSelectionStart();
            }
        });
    }

    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 Font Color");
        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.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();
    }

    // AttributeSet
    public MutableAttributeSet setStyles(MutableAttributeSet attr) {
        String font = StyleConstants.getFontFamily(selectedAttribute);
        StyleConstants.setFontFamily(attr, font);
        int size = StyleConstants.getFontSize(selectedAttribute);
        StyleConstants.setFontSize(attr, size);
        Color c = StyleConstants.getForeground(selectedAttribute);
        StyleConstants.setForeground(attr, c);
        Boolean bold = StyleConstants.isBold(selectedAttribute);
        StyleConstants.setBold(attr, bold);
        Boolean underline = StyleConstants.isUnderline(selectedAttribute);
        StyleConstants.setItalic(attr, underline);
        Boolean italic = StyleConstants.isItalic(selectedAttribute);
        StyleConstants.setItalic(attr, italic);
        return attr;
    }

    private void changeStyleFontColor(String color) {
        MutableAttributeSet attr = new SimpleAttributeSet();
        attr = setStyles(attr);
        Color c = null;
        try {
            Class cobj = ClassLoader.getSystemClassLoader().loadClass("java.awt.Color");
            Field field = cobj.getField(color);
            c = (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();
        }
        StyleConstants.setForeground(attr, c);
        StyledDocument doc = textPane.getStyledDocument();
        doc.setCharacterAttributes(selectionStart, selectionEnd - selectionStart, attr, true);
        textPane.select(selectionStart, selectionEnd);
    }

    private void changeStyleFontColorCc(Color color) {
        MutableAttributeSet attr = new SimpleAttributeSet();
        attr = setStyles(attr);
        StyleConstants.setForeground(attr, color);
        StyledDocument doc = textPane.getStyledDocument();
        doc.setCharacterAttributes(selectionStart, selectionEnd - selectionStart, attr, true);
        textPane.select(selectionStart, selectionEnd);
    }

    private void changeFontColor() {
        // check für gemachte selektion
        if (selectionEnd - selectionStart > 0) {
            String fontColor = String.valueOf(comboBoxFontColor.getSelectedItem());
            changeStyleFontColor(fontColor);
        }
        textPane.requestFocus();
    }

    private void changeFontColorColorChooser() {
        // check für gemachte selektion
        if (selectionEnd - selectionStart > 0) {
            Color color = JColorChooser.showDialog(null,
                    "Farbauswahl", null);
            changeStyleFontColorCc(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): 02.01.2020

* Funktion: TextPane Font Color =

* formatiert selektierten Text in der gewuenschten Textfarbe

* Function: TextPane Font Color =

* format of selected text 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 buttonFontColor;

private JComboBox comboBoxFontColor;

private JButton buttonFontColorColorChooser;

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

private int selectionStart, selectionEnd;

private AttributeSet selectedAttribute;

public TextPane() {

textPane.setContentType("text/rtf");

textPane.setEditorKit(new RTFEditorKit());

// font color

for (String str : FONT_COLORS) {

comboBoxFontColor.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");

}

});

buttonFontColor.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent actionEvent) {

changeFontColor();

}

});

buttonFontColorColorChooser.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent actionEvent) {

changeFontColorColorChooser();

}

});

// notwendig für selections

textPane.addCaretListener(new CaretListener() { // achtet auf selektion

@Override

public void caretUpdate(CaretEvent caretEvent) {

selectionStart = textPane.getSelectionStart();

selectionEnd = textPane.getSelectionEnd();

StyledDocument doc = textPane.getStyledDocument();

selectedAttribute = doc.getCharacterElement(selectionStart).getAttributes();

selectionStart = textPane.getSelectionStart();

}

});

}

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 Font Color");

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.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();

}

// AttributeSet

public MutableAttributeSet setStyles(MutableAttributeSet attr) {

String font = StyleConstants.getFontFamily(selectedAttribute);

StyleConstants.setFontFamily(attr, font);

int size = StyleConstants.getFontSize(selectedAttribute);

StyleConstants.setFontSize(attr, size);

Color c = StyleConstants.getForeground(selectedAttribute);

StyleConstants.setForeground(attr, c);

Boolean bold = StyleConstants.isBold(selectedAttribute);

StyleConstants.setBold(attr, bold);

Boolean underline = StyleConstants.isUnderline(selectedAttribute);

StyleConstants.setItalic(attr, underline);

Boolean italic = StyleConstants.isItalic(selectedAttribute);

StyleConstants.setItalic(attr, italic);

return attr;

}

private void changeStyleFontColor(String color) {

MutableAttributeSet attr = new SimpleAttributeSet();

attr = setStyles(attr);

Color c = null;

try {

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

Field field = cobj.getField(color);

c = (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();

}

StyleConstants.setForeground(attr, c);

StyledDocument doc = textPane.getStyledDocument();

doc.setCharacterAttributes(selectionStart, selectionEnd - selectionStart, attr, true);

textPane.select(selectionStart, selectionEnd);

}

private void changeStyleFontColorCc(Color color) {

MutableAttributeSet attr = new SimpleAttributeSet();

attr = setStyles(attr);

StyleConstants.setForeground(attr, color);

StyledDocument doc = textPane.getStyledDocument();

doc.setCharacterAttributes(selectionStart, selectionEnd - selectionStart, attr, true);

textPane.select(selectionStart, selectionEnd);

}

private void changeFontColor() {

// check für gemachte selektion

if (selectionEnd - selectionStart > 0) {

String fontColor = String.valueOf(comboBoxFontColor.getSelectedItem());

changeStyleFontColor(fontColor);

}

textPane.requestFocus();

}

private void changeFontColorColorChooser() {

// check für gemachte selektion

if (selectionEnd - selectionStart > 0) {

Color color = JColorChooser.showDialog(null,

"Farbauswahl", null);

changeStyleFontColorCc(color);

}

textPane.requestFocus();

}

Hier die Form:

<?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="buttonFontColor">
            <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="font color"/>
            </properties>
          </component>
          <component id="9c0b1" class="javax.swing.JComboBox" binding="comboBoxFontColor">
            <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="buttonFontColorColorChooser">
            <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: 02.01.2020