TextPane Font Size – JavaCrypto

Neben der Schriftfarbe ist auch die Schriftgröße eine beliebte Textformatierung. Ich habe diese derart ins das Basisform eingebaut, in dem ich eine JComboBox mit ein paar Werten vorbefüllt habe. Sobald eine Textstelle selektiert wurde kann die Schriftgröße mit einem Klick auf den Button „font size“ aktiviert werden.

Analog zu den bisherigen Beispielen geht der Weg über die „StyleConstants“ und der „MutableAttributeSet“.

So sieht unsere Beispielanwendung aus, nachdem die Demo-RTF-Datei geladen worden ist:

Hier ist der Quelltext:

/*
 * 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 Size =
 *           formatiert selektierten Text in der Schriftgroesse
 * Function: TextPane Font Size =
 *           format of selected text in size
 *
 * 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.*;

public class TextPane {
    private JPanel panelMain;
    private JPanel panelButtons;
    private JButton buttonLoad;
    private JScrollPane scrollPane;
    private JTextPane textPane;
    private JButton buttonSave;
    private JButton buttonFontSize;
    private JComboBox comboBoxFontSize;
    private static String[] FONT_SIZES = new String[]{"12", "14", "16", "18", "20", "22", "24", "26", "28", "30", "36", "42", "50"};
    private int selectionStart, selectionEnd;
    private AttributeSet selectedAttribute;

    public TextPane() {

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

        // font sizes
        for (String str : FONT_SIZES) {
            comboBoxFontSize.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");
            }
        });

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

        // 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 Size");
        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 changeStyleFontSize(int size) {
        MutableAttributeSet attr = new SimpleAttributeSet();
        attr = setStyles(attr);
        StyleConstants.setFontSize(attr, size);
        StyledDocument doc = textPane.getStyledDocument();
        doc.setCharacterAttributes(selectionStart, selectionEnd - selectionStart, attr, true);
        textPane.select(selectionStart, selectionEnd);
    }

    private void changeFontSize() {
        // check für gemachte selektion
        if (selectionEnd - selectionStart > 0) {
            String cbxItem = String.valueOf(comboBoxFontSize.getSelectedItem());
            //System.out.println("Size:" + cbxItem);
            int fontSize = 20;
            try {
                fontSize = Integer.parseInt(cbxItem);
            } catch (NumberFormatException e) {
            }
            changeStyleFontSize(fontSize);
        }
        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 Size =

* formatiert selektierten Text in der Schriftgroesse

* Function: TextPane Font Size =

* format of selected text in size

* 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.*;

public class TextPane {

private JPanel panelMain;

private JPanel panelButtons;

private JButton buttonLoad;

private JScrollPane scrollPane;

private JTextPane textPane;

private JButton buttonSave;

private JButton buttonFontSize;

private JComboBox comboBoxFontSize;

private static String[] FONT_SIZES = new String[]{"12", "14", "16", "18", "20", "22", "24", "26", "28", "30", "36", "42", "50"};

private int selectionStart, selectionEnd;

private AttributeSet selectedAttribute;

public TextPane() {

textPane.setContentType("text/rtf");

textPane.setEditorKit(new RTFEditorKit());

// font sizes

for (String str : FONT_SIZES) {

comboBoxFontSize.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");

}

});

buttonFontSize.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent actionEvent) {

changeFontSize();

}

});

// 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 Size");

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 changeStyleFontSize(int size) {

MutableAttributeSet attr = new SimpleAttributeSet();

attr = setStyles(attr);

StyleConstants.setFontSize(attr, size);

StyledDocument doc = textPane.getStyledDocument();

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

textPane.select(selectionStart, selectionEnd);

}

private void changeFontSize() {

// check für gemachte selektion

if (selectionEnd - selectionStart > 0) {

String cbxItem = String.valueOf(comboBoxFontSize.getSelectedItem());

//System.out.println("Size:" + cbxItem);

int fontSize = 20;

try {

fontSize = Integer.parseInt(cbxItem);

} catch (NumberFormatException e) {

}

changeStyleFontSize(fontSize);

}

textPane.requestFocus();

}

Das ist die Form (nicht vergessen – Ihr benötigt intelliJ zur Nutzung:

<?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>
              <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>
              <text value="save"/>
            </properties>
          </component>
          <component id="26a30" class="javax.swing.JButton" binding="buttonFontSize">
            <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 size"/>
            </properties>
          </component>
          <component id="9c0b1" class="javax.swing.JComboBox" binding="comboBoxFontSize">
            <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>
        </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>

</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