JDestopPane & JInternalFrame in Java Swing

Table of Contents

1. JDesktopPane and JInternalFrame

In Java Swing, one can create MDI (Multiple Document Interface) applications using JDesktopPane and JInternalFrame. The JDesktopPane is the parent for JInternalFrame, and it can manage multiple internal frames. For this reason, Java Swing extends JDesktopPane from JLayeredPane to know how to manage the overlapping internal frames. JInternalPane provides the functionality of the JFrame, like resize, move, minimize, and maximize. But it will work for the parent JDesktopPane. One can add swing components to the JInternalFrame and finally give it to the JDesktopPane.

2. About the JDesktopPane Example

The below screen shows the JDesktopPane Example:

In this example, we will derive from a JInternalFrame to display html content via the JEditorPane. In the bottom, we have JTextField where you can set a title for the JInternalFrame. When you click Show Html, a static html content will be displayed in the JInternalFrame. You can open multiple JInternalFrame. The example shows static html content, but you can extend this example to ask the user to select a Html file from the disc.

3. Prepare Bottom Panel

The bottom of JFrame contains a JPanel which holds a JLabel, JTextField and a JButton. Snippet-01 sets size and position for the JFrame. In Snippet-02, we created the JTextField and JDesktopPane. The variables lx and ly decide the location of the JInternalFrame. Snippet-3 assembles all these controls inside the JPanel before adding it to the JFrame’s bottom area.

//Sample 02: Members
JTextField jt = new JTextField(25);
JDesktopPane DTPane = new JDesktopPane();
int lx = 0;
int ly = 0;

@SuppressWarnings("unchecked")
public SwingInternalPane(String title)  
{
  super(title);
  //Sample 01: Set Size and Position
  setBounds(100, 100, 750, 600);
  Container ControlHost = getContentPane();
  ControlHost.setLayout(new BorderLayout());
  
  //Run 1.
  //Sample 03: Create South Panel
  JPanel cmdPanel = new JPanel();
  JButton btnShowHtml = new JButton("Show Html"); 
  JLabel lbl = new JLabel("Document Title");
  cmdPanel.add(lbl);
  cmdPanel.add(jt);
  cmdPanel.add(btnShowHtml);
  add(cmdPanel, BorderLayout.SOUTH);

//Sample 02: Members

JTextField jt = new JTextField(25);

JDesktopPane DTPane = new JDesktopPane();

int lx = 0;

int ly = 0;

@SuppressWarnings("unchecked")

public SwingInternalPane(String title)

{

super(title);

//Sample 01: Set Size and Position

setBounds(100, 100, 750, 600);

Container ControlHost = getContentPane();

ControlHost.setLayout(new BorderLayout());

//Run 1.

//Sample 03: Create South Panel

JPanel cmdPanel = new JPanel();

JButton btnShowHtml = new JButton("Show Html");

JLabel lbl = new JLabel("Document Title");

cmdPanel.add(lbl);

cmdPanel.add(jt);

cmdPanel.add(btnShowHtml);

add(cmdPanel, BorderLayout.SOUTH);

4. Equip JDesktopPane on JFrame

In section 3, we made the bottom panel ready and displayed it. Now, we add the JDesktopPane to the centre part of the JFrame window via the add method call. Before adding, we set a Gray background color for the desktop pane via the method call setBackground.

//Sample 04: Prepare Desktop Pane & add
DTPane.setBackground(Color.LIGHT_GRAY);
add(DTPane);

//Sample 04: Prepare Desktop Pane & add

DTPane.setBackground(Color.LIGHT_GRAY);

add(DTPane);

5. Html Document as JInternalFrame

JDesktopPane can host multiple JInternalFrame in it. In the below code, we derive HtmlWindow from the JInternalFrame. Our constructor takes a string to set the title for the internal frame.

Code Explanation

HtmlWindow Derives from the JInternalFrame so that it can be added to the JDesktopPane.
The snippet creates the JEditorPane to show html content in it.
This snippet creates a JScrollPane to manage the content of the JEditorPane. After setting the preferred size for the pane, the code claims to have vertical scrollbar. Finally, we add the JScrollPane, which is managing the JEditorPane, to the JInternalFrame via the add method call.
Here, we get the system path to the html file in URL format.
We set the html page to the JEditorPane via the function call setPage.

Note, the JInternalFrame we are preparing here will be housed in the JDesktopPane. The container-child relations go like this:

JFrame Window manages the JDesktopPane in its centre part by employing the BorderLayout manager.
JDesktopPane will manage one or more JInternalFrame.
JInternalPane houses JScrollPane.
JScrollPane is housing the JEditorPane and provides scrolling support.
JEditorPane is the one which takes care of displaying the document. Here in our case, it is a Html Document.

This way, our example is an MDI Application for Html Document Display.

6. Display JInternalFrame in JDecktopPane (MDI)

We display the JInternalFrame when user clicks the Show Html button. Below is the handler code and its explanation:

Code Explanation

Each time when user click the Show Html button, we should show JInternalFrame which displays the html content. We change the X, Y location so that we can see the JInternalFrame stacked over the previous one.
In this snippet, we construct the JInternalFrame derived instance HtmlWindow. We pass the title for the JInternalFrame from the JTextField which presents in the JFrame. Once the object is ready, this snippet adds the internal frame to the JDesktopPane by calling the add method.
The setClosable method presents an ‘X’ button on the frame title so that the user can close internal frame. We display the JInternalFrame at the calculated location lx and ly. The pack method will ask the layout manager to pack all the components in the JInternalFrame and, if needed, resize it.
Here, setSizable method allows the user to resize the JInternalFrame. The methods setMaximizable and setIconifiable displays the Minimize and maximize button in the top right corner of the JInternalFrame.

That is all! We are done with the example. You can watch the video in the next section and code snippets are also provided for copy & paste.

7. Youtube Demo – JDesktopPane

Creating MDI Application in Java Swing

8. Code Reference

8.1 MainEntry.java

package tube.coding.examples;
public class MainEntry {
  public static void main(String[] args) 
  {
    SwingInternalPane frame = 
      new SwingInternalPane("Swing Internal Pane Example");
    frame.setVisible(true);
  }
}

package tube.coding.examples;

public class MainEntry {

public static void main(String[] args)

{

SwingInternalPane frame =

new SwingInternalPane("Swing Internal Pane Example");

frame.setVisible(true);

}

8.2 HtmlWindow.java

package tube.coding.examples;

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.io.IOException;
import java.net.URL;

import javax.swing.JEditorPane;
import javax.swing.JInternalFrame;
import javax.swing.JScrollPane;

//Sample 05: Create Window to show html
public class HtmlWindow extends JInternalFrame
{
  public HtmlWindow(String title)
  {
    //Sample 06: Set Size and Position
    super(title);
    Container ControlHost = getContentPane();
    ControlHost.setLayout(new BorderLayout());    
    
    //Sample 07: Create Editor Pane to show html
    JEditorPane jep = new JEditorPane();
    jep.setEnabled(true);
    JScrollPane scroll = new JScrollPane(jep);
    Dimension ScrollSize = new Dimension(500, 150);
    scroll.setPreferredSize(ScrollSize);
    scroll.setVerticalScrollBarPolicy(
        JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
    ControlHost.add(scroll);
    URL HtmlPage = HtmlWindow.class.getResource("Test.html");
    try {
      jep.setPage(HtmlPage);
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}

package tube.coding.examples;

import java.awt.BorderLayout;

import java.awt.Container;

import java.awt.Dimension;

import java.io.IOException;

import java.net.URL;

import javax.swing.JEditorPane;

import javax.swing.JInternalFrame;

import javax.swing.JScrollPane;

//Sample 05: Create Window to show html

public class HtmlWindow extends JInternalFrame

{

public HtmlWindow(String title)

{

//Sample 06: Set Size and Position

super(title);

Container ControlHost = getContentPane();

ControlHost.setLayout(new BorderLayout());

//Sample 07: Create Editor Pane to show html

JEditorPane jep = new JEditorPane();

jep.setEnabled(true);

JScrollPane scroll = new JScrollPane(jep);

Dimension ScrollSize = new Dimension(500, 150);

scroll.setPreferredSize(ScrollSize);

scroll.setVerticalScrollBarPolicy(

JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);

ControlHost.add(scroll);

URL HtmlPage = HtmlWindow.class.getResource("Test.html");

try {

jep.setPage(HtmlPage);

} catch (IOException e) {

e.printStackTrace();

}

8.3 SwingInternalPane.java

package tube.coding.examples;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.net.URL;

import javax.swing.JButton;
import javax.swing.JDesktopPane;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;

@SuppressWarnings("serial")
public class SwingInternalPane extends JFrame 
{
  //Sample 02: Members
  JTextField jt = new JTextField(25);
  JDesktopPane DTPane = new JDesktopPane();
  int lx = 0;
  int ly = 0;
  
  @SuppressWarnings("unchecked")
  public SwingInternalPane(String title)  
  {
    super(title);
    //Sample 01: Set Size and Position
    setBounds(100, 100, 750, 600);
    Container ControlHost = getContentPane();
    ControlHost.setLayout(new BorderLayout());
    
    //Run 1.
    //Sample 03: Create South Panel
    JPanel cmdPanel = new JPanel();
    JButton btnShowHtml = new JButton("Show Html"); 
    JLabel lbl = new JLabel("Document Title");
    cmdPanel.add(lbl);
    cmdPanel.add(jt);
    cmdPanel.add(btnShowHtml);
    add(cmdPanel, BorderLayout.SOUTH);
    
    //Run2.
    //Sample 04: Prepare Desktop Pane & add
    DTPane.setBackground(Color.LIGHT_GRAY);
    add(DTPane);
    
    //Run 3.
    //Sample 08: Show Html Document
    btnShowHtml.addActionListener(new ActionListener()
    {
      @Override
      public void actionPerformed(ActionEvent e)
      {
        //8.1 Calculate the location
        lx = lx + 10;
        ly = ly + 10;
        
        //8.2 Create Internal pane and add it to Document Pane
        HtmlWindow HtmlInternalWindow = new HtmlWindow(jt.getText());
        DTPane.add(HtmlInternalWindow);
        
        //8.3 Display the Internal Pane
        HtmlInternalWindow.setClosable(true);
        HtmlInternalWindow.setVisible(true);
        HtmlInternalWindow.setLocation(lx, ly);
        HtmlInternalWindow.pack();
        
        //8.4 Check Other Properties
        HtmlInternalWindow.setResizable(true);
        HtmlInternalWindow.setMaximizable(true);
        HtmlInternalWindow.setIconifiable(true);
      }
    });
  }
}

package tube.coding.examples;

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Container;

import java.awt.Dimension;

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.IOException;

import java.net.URL;

import javax.swing.JButton;

import javax.swing.JDesktopPane;

import javax.swing.JEditorPane;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

import javax.swing.JTextField;

@SuppressWarnings("serial")

public class SwingInternalPane extends JFrame

{

//Sample 02: Members

JTextField jt = new JTextField(25);

JDesktopPane DTPane = new JDesktopPane();

int lx = 0;

int ly = 0;

@SuppressWarnings("unchecked")

public SwingInternalPane(String title)

{

super(title);

//Sample 01: Set Size and Position

setBounds(100, 100, 750, 600);

Container ControlHost = getContentPane();

ControlHost.setLayout(new BorderLayout());

//Run 1.

//Sample 03: Create South Panel

JPanel cmdPanel = new JPanel();

JButton btnShowHtml = new JButton("Show Html");

JLabel lbl = new JLabel("Document Title");

cmdPanel.add(lbl);

cmdPanel.add(jt);

cmdPanel.add(btnShowHtml);

add(cmdPanel, BorderLayout.SOUTH);

//Run2.

//Sample 04: Prepare Desktop Pane & add

DTPane.setBackground(Color.LIGHT_GRAY);

add(DTPane);

//Run 3.

//Sample 08: Show Html Document

btnShowHtml.addActionListener(new ActionListener()

{

@Override

public void actionPerformed(ActionEvent e)

{

//8.1 Calculate the location

lx = lx + 10;

ly = ly + 10;

//8.2 Create Internal pane and add it to Document Pane

HtmlWindow HtmlInternalWindow = new HtmlWindow(jt.getText());

DTPane.add(HtmlInternalWindow);

//8.3 Display the Internal Pane

HtmlInternalWindow.setClosable(true);

HtmlInternalWindow.setVisible(true);

HtmlInternalWindow.setLocation(lx, ly);

HtmlInternalWindow.pack();

//8.4 Check Other Properties

HtmlInternalWindow.setResizable(true);

HtmlInternalWindow.setMaximizable(true);

HtmlInternalWindow.setIconifiable(true);

}

});

}

Categories: Swing

Tags: JDesktopPane, JEditorPane, JInternalFrame, setIconifiable, setMaximizable, setPage, setSizable

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Programming Examples

Are you a Programmer or Application Developer or a DBA? Take a cup of coffee, sit back and spend few minutes here :)

JDestopPane & JInternalFrame in Java Swing

1. JDesktopPane and JInternalFrame

2. About the JDesktopPane Example

3. Prepare Bottom Panel

4. Equip JDesktopPane on JFrame

5. Html Document as JInternalFrame

Code Explanation

6. Display JInternalFrame in JDecktopPane (MDI)

Code Explanation

7. Youtube Demo – JDesktopPane

8. Code Reference

8.1 MainEntry.java

8.2 HtmlWindow.java

8.3 SwingInternalPane.java

Like this:

Related

Do you like this Example? Please comment about it for others!!Cancel reply

Programming Examples

Are you a Programmer or Application Developer or a DBA? Take a cup of coffee, sit back and spend few minutes here :)

JDestopPane & JInternalFrame in Java Swing

1. JDesktopPane and JInternalFrame

2. About the JDesktopPane Example

3. Prepare Bottom Panel

4. Equip JDesktopPane on JFrame

5. Html Document as JInternalFrame

Code Explanation

6. Display JInternalFrame in JDecktopPane (MDI)

Code Explanation

7. Youtube Demo – JDesktopPane

8. Code Reference

8.1 MainEntry.java

8.2 HtmlWindow.java

8.3 SwingInternalPane.java

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Like this:

Related

Do you like this Example? Please comment about it for others!!Cancel reply