I'm trying to add this JTextArea with a JScrollPane (with vertical but not horizontal scrollbar) to my frame but the result is just a grey area with a scrollbar on the right... I'm probably doing something really dumb but i've done that same exact thing to a JPanel and it worked
public class Chats {
public static int height = 600;
public static int length = 400;
public static void init(String me, String you){
JFrame frame = new JFrame ("Chat");
frame.setSize(larguraframe, alturaframe);
frame.setLocation(620, 100);
frame.setResizable(false);
frame.setLayout(null);
frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
JTextArea chat = new JTextArea();
chat.setColumns(10);
chat.setLineWrap(true);
chat.setWrapStyleWord(true);
JScrollPane scrollpane = new JScrollPane(chat, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER;
scrollpane.setBounds(length/8 - 27, height/9 + 27, 350, 380);
chat.setPreferredSize(new Dimension(lenght-15, 7*height/8-27));
frame.add(chat);
frame.add(scrollpane);
frame.setVisible(true);
}
}
I don't mind changing my frame's Layout but i really want one that allows me to put stuff exactly where i want it. Thanks
EDIT
Okay it now shows on my frame but the TextArea is still not resizable. When i write something in it using a JTextfield and a JButton with a Listener that appends the JTextfield's text to the JTextArea and then sets the text in the JTextField to "" it only accepts up to a certain ammount of lines. After that it just looks the same.
I know that you've already "accepted" an answer, but I feel that I'd be remiss if I didn't give an answer that gave important points, ones that in the long run would allow you to create a better and more robust (i.e., a more easily debuggable, modifiable, and enhanceable) application.
Again,
Never set a JTextArea's preferredSize, as this will create a JTextArea whose size is inflexibly set that will not add additional lines when needed. Instead set the JTextArea's row and column properties.
While null layouts and setBounds() might seem to Swing newbies like the easiest and best way to create complex GUI's, the more Swing GUI'S you create the more serious difficulties you will run into when using them. They won't resize your components when the GUI resizes, they are a royal witch to enhance or maintain, they fail completely when placed in scrollpanes, they look gawd-awful when viewed on all platforms or screen resolutions that are different from the original one.
Better to use a JPanel, or more often multiple nested JPanels, each using its own layout manager that allow you to more simply create agile and powerful complex yet beautiful GUI's.
When using layout managers, you'll want to pack() your JFrame after adding all components so that all layout managers will do their jobs and layout components appropriately.
I've an example program below I show,
a title JLabel with large centered text
a JTextArea, called chatViewArea, of specified row and column size held within a JScrollPane and that is for viewing the chat. It is non-focusable so that the user cannot directly interact with it.
Another JTextArea, called textEntryArea, for entering text. You could use a simple JTextField for this and give it an ActionListener so that it responds to the enter key, however if you want a multi-lined text component that acts similar, you'll need to change the key bindings for the JTextArea's enter key. I've done that here so that the enter key "submits" the text held within the textEntryArea JTextArea, and the control-enter key combination acts the same as the enter key used to -- creating a new line.
The main JPanel uses simply a BorderLayout to allow placement of the title at the top, the chat view JTextArea in the center and the text entry JTextArea at the bottom. Note that if you needed to see more components, such as a JList showing other chatters, this can be done by nesting JPanels and using more layouts if need be.
For example:
import java.awt.BorderLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.*;
#SuppressWarnings("serial")
public class Chat2 extends JPanel {
private static final int ROWS = 25; // rows in the chat view JTextArea
private static final int COLS = 40; // columns in the chat view JTextArea
// and text entry area
private static final int ENTRY_ROWS = 4; // rows in the text entry JTextArea
private static final int BL_HGAP = 10; // horizontal gap for our
// BorderLayout
private static final int BL_VGAP = 5; // vertical gap for our BorderLayout
private static final int EB_GAP = 15; // gap for empty border that goes
// around entire app
private static final String TITLE_TEXT = "My Chat Application";
private static final float TITLE_POINTS = 32f; // size of the title jlabel
// text
private JTextArea chatViewArea = new JTextArea(ROWS, COLS);
private JTextArea textEntryArea = new JTextArea(ENTRY_ROWS, COLS);
public Chat2() {
// label to display the title in bold large text
JLabel titleLabel = new JLabel(TITLE_TEXT, SwingConstants.CENTER);
titleLabel.setFont(titleLabel.getFont().deriveFont(Font.BOLD, TITLE_POINTS));
// set up the chat view JTextArea to have word wrap
// and to not be focusable
chatViewArea.setWrapStyleWord(true);
chatViewArea.setLineWrap(true);
chatViewArea.setFocusable(false);
// add it to a JScrollPane, and give the scrollpane vertical scrollbars
JScrollPane viewScrollPane = new JScrollPane(chatViewArea);
viewScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
// set up the text entry JTextArea
textEntryArea.setWrapStyleWord(true);
textEntryArea.setLineWrap(true);
// key bindings so that control-enter will act as enter and the enter key will "submit"
// the user input to the chat window and the chat server
// will allow us to use a multilined text entry area if desired instead
// of a single lined JTextField
setEnterKeyBinding(textEntryArea);
JScrollPane entryScrollPane = new JScrollPane(textEntryArea);
entryScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
// add an empty border around entire application
setBorder(BorderFactory.createEmptyBorder(EB_GAP, EB_GAP, EB_GAP, EB_GAP));
// make the main layout a BorderLayout
setLayout(new BorderLayout(BL_HGAP, BL_VGAP));
// add our components to the GUI
add(titleLabel, BorderLayout.PAGE_START);
add(viewScrollPane, BorderLayout.CENTER);
add(entryScrollPane, BorderLayout.PAGE_END);
}
// Again, use key bindings so that control-enter JTextArea will act as enter key
// and the enter key will "submit" the user input to the chat window and the chat server.
// When ctrl-enter is pushed the Action originally bound to the enter key will be called
// and when enter is pushed a new Action, the EnterKeyAction, will be called
private void setEnterKeyBinding(JTextArea textArea) {
int condition = JComponent.WHEN_FOCUSED; // only for focused entry key
InputMap inputMap = textArea.getInputMap(condition);
ActionMap actionMap = textArea.getActionMap();
KeyStroke entryKeyStroke = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0);
KeyStroke ctrlEntryKeyStroke = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, KeyEvent.CTRL_DOWN_MASK);
// first give ctrl-enter the action held by enter
Object entryKey = inputMap.get(entryKeyStroke);
Action entryAction = actionMap.get(entryKey);
inputMap.put(ctrlEntryKeyStroke, ctrlEntryKeyStroke.toString());
actionMap.put(ctrlEntryKeyStroke.toString(), entryAction);
// now give enter key a new Action
EnterKeyAction enterKeyAction = new EnterKeyAction();
inputMap.put(entryKeyStroke, entryKeyStroke.toString());
actionMap.put(entryKeyStroke.toString(), enterKeyAction);
}
public void appendToChatArea(final String text) {
if (SwingUtilities.isEventDispatchThread()) {
chatViewArea.append(text + "\n");
} else {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
chatViewArea.append(text + "\n");
}
});
}
}
private class EnterKeyAction extends AbstractAction {
#Override
public void actionPerformed(ActionEvent e) {
String text = textEntryArea.getText();
textEntryArea.setText("");
chatViewArea.append("User: " + text + "\n");
// TODO send text to the chat server!
}
}
private static void createAndShowGui() {
Chat2 mainPanel = new Chat2();
JFrame frame = new JFrame("My Chat Window");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
// pack the JFrame so that it will size itself to its components
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
Try setting a layout like this:
frame.setLayout(new BorderLayout());
And adding the scrollpane to the center:
frame.add(scrollpane, BorderLayout.CENTER);
Also remove the line pointed by Jire in his answer.
You don't need to add chat because it is adapted by scrollPane.
Remove this line: frame.add(chat);
Add
chat.setBounds(length/8 - 27, height/9 + 27, 330, 360);
And see the magic happen... but do tweek the arguments here in order to get the right dimensions.
For resizable frame just do frame.setResizable(true); instead of frame.setResizable(false);
Related
This question already has an answer here:
JScrollPane not appearing on JTextArea
(1 answer)
Closed 3 years ago.
The vertical scrollbar won't show. Here is my code.
The java frame shows the textarea but the scrollbar for the textarea is not showing. I'm a green programmer so I dont have much clue of what I'm doing.
What should I do to make the scrollbar show?
Please see my code and find my mistake.
I want the scrollbar to show on the JTextArea
import javax.swing.*;//imported for the frame of the chatbot
import java.awt.*;
import java.awt.event.*;
public class Bot extends JFrame{
private JTextArea Chatarea = new JTextArea(10,20);
private JTextField Chatbox = new JTextField();
private JScrollPane Scroll = new JScrollPane(Chatarea,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
public Bot(){//frame for the chatbot
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.setVisible(true);
frame.setResizable(false);
frame.setLocationRelativeTo(null);
frame.setLayout(null);
frame.setSize(600 , 600);
frame.setTitle("JAVADDY");
frame.add(Chatarea);
frame.add(Chatbox);//
//for chat area
Chatarea.setSize(560, 400);
Chatarea.setBackground(Color.YELLOW);
Chatarea.setLocation(2, 50);
Chatarea.setLineWrap(true);
Chatarea.setEditable(false);//make jtextarea uneditable
//for chat box
Chatbox.setSize(540, 30);
Chatbox.setLocation(2, 500);
//for scrolling
Scroll.setSize(1024,800);
Scroll.setVisible(true);
Chatbox.addActionListener(new ActionListener(){
//#Override
public void actionPerformed(ActionEvent arg0){
String gtext = Chatbox.getText();
Chatarea.append("You -> "+ gtext+"\n");
Chatbox.setText("");
//place algorithm here
if(gtext.contains("Hello")){
//find way to connect to database
bot("Hi");
}
else{
bot("I don't understand.");
}
}
});
}// end of frame for the chatbot
private void bot(String string){
Chatarea.append("Bot ->" +string+"\n");
}
public static void main(String[] args){
new Bot();
}
}
Question
Did you use JScrollPane.setViewport(what's inside the JScrollPane)?
Try: Scroll.setViewport(Chatarea);
What, why and how
If all JScrollPane's contents fit, then the scroll bar is hidden. When JScrollPane has many big elements inside it, a scroll bar will be shown, in order to scroll thru it.
Try this
Add many buttons or labels inside your JScrollPane to see, if the scroll bar appears, if not, we will find out why
While YoungDev offers good advice, the problem is actually here:
Chatarea.setSize(560, 400);
Don't set the size of the JTextArea, since this constrains it to never expand when it needs to. Instead set its column and row properties which constrains the visible columns and rows, but does not constrain its actual size, allowing it to expand.
And also get rid of this:
frame.setLayout(null);
as you're shooting yourself in the foot by ignoring the layout managers.
I have a JPanel which consists of a dropdown and a text field inside my JFrame. There is a button in my JFrame, when user clicks on that button, application adds new JPanel with the same components i.e. drop down and a text field. So, for this I have created a function which gets called on clicking on the button using ActionListener.
Everything works fine from GUI side but the problem is when user is done with adding JPanels and entering the values in these drop downs and text fields, it will click on Submit button. Upon clicking on Submit button, I should be able to fetch the values from all drop downs and text fields. This is a challenge, since I am using the same functions to create JPanels, I can't call its name to get the values since that will give me the last JPanel values.
Any suggestion how I should go about this? I have added the screenshot of my JFrame and the function to create the JPanel. Any help is appreciated. Thanks.
public static void AddPanel(final Container pane) {
panel1 = new JPanel();
String text = "<html><b>Property" + nooftimes + " :</b></html>";
JLabel label = new JLabel(text);
label.setPreferredSize(new Dimension(80, 30));
panel1.add(label);
panel1.add(new JLabel("Please enter the property"));
DefaultComboBoxModel<String> model = new DefaultComboBoxModel<String>();
model.addElement("value1");
model.addElement("value2");
model.addElement("value3");
model.addElement("value4");
model.addElement("value5");
final JComboBox<String> comboBox1 = new JComboBox<String>(model);
AutoCompleteDecorator.decorate(comboBox1);
comboBox1.setPreferredSize(new Dimension(120, 22));
panel1.add(comboBox1);
final JTextField txtfield1 = new JTextField(
"Please enter your value here");
txtfield1.setPreferredSize(new Dimension(200, 22));
panel1.add(txtfield1);
txtfield1.addFocusListener(new FocusListener() {
public void focusGained(FocusEvent e) {
txtfield1.setText("");
}
public void focusLost(FocusEvent e) {
// nothing
}
});
container.add(panel1);
nooftimes++;
frame.revalidate();
frame.validate();
frame.repaint();
}
Screenshot:
}
You could return the JPanel and store it in a List<JPanel>. When you click your submit-Button you are able to iterate through the JPanels and its Components.
public class Application {
private static List<JPanel> panels = new ArrayList<>();
private static Container someContainer = new Container();
public static void main(String[] args) {
panels.add(addPanel(someContainer));
panels.add(addPanel(someContainer));
panels.add(addPanel(someContainer));
submit();
}
public static JPanel addPanel(final Container pane) {
JPanel panel1 = new JPanel();
// shortened code
final JComboBox<String> comboBox1 = new JComboBox<String>();
panel1.add(comboBox1);
final JTextField txtfield1 = new JTextField("Please enter your value here");
txtfield1.setText(String.valueOf(Math.random()));
panel1.add(txtfield1);
return panel1;
}
private static void submit() {
for (JPanel panel : panels) {
Component[] components = panel.getComponents();
for (Component comp : components) {
// Cast comp to JComboBox / JTextField to get the values
if (comp instanceof JTextField) {
JTextField textField = (JTextField) comp;
System.out.println(textField.getText());
}
}
}
}
}
You could simply have a class (extending JPanel) with specific methods to add your components , and to get inputs from user (i.e. get the combo box selected index and text from textfield ).
Every time you add a panel, you don't call a static method, but you create an instance of this class, keeping the reference somewhere (for example adding it to an arraylist).
But you could consider a different scenario: personally i don't like to add components "on fly", you could have a component (for example another JComboBox), where user can select the number of values he needs.
You decide a default value (for example 4), so at the beginning you create 4 panels of your class, and you can use a simple array containing them.
If the user changes the number of panels, you could dispose frame and create a new one.
Of course this solution does not woork good if you want to keep inputs inserted, or if the frame construction takes a lot of time.
Here there is a screenshot of a gui i created: user can select the number of partials, when the choice changes i just recreate the panels below,containing the textfields (which are memorized in a two-dimensional array).
I'm very new to Java and I'm trying to create a small program that reverses text (That part I've figured out).
Where I'm getting stuck on is my GUI, my envisioned plan for the gui is a window with a centered text field for user input then under it in the directly middle of the window a button that reverses the text from the above text box and outputs it in a text box below the button.
Right now I'm using JTextField boxes and after trying to make them look the way I want I'm getting the feeling that there's an easier way to do it, but I don't know it.
Here's my GUI class:
public class ReverseTextGUI extends ReverseRun implements ActionListener {
public static JFrame frame;
private JPanel northFlowLayoutPanel;
private JPanel centerFlowLayoutPanel;
private JPanel southFlowLayoutPanel;
private final JButton reverse = new JButton("Reverse");
private final JTextField userInput = new JTextField(50);
private final JTextField reverseOutput = new JTextField(50);
public void actionPerformed(ActionEvent e) {
reverse.addActionListener((ActionListener) reverse);
reverse.setActionCommand("Reverse");
if ("algorithm".equals(e.getActionCommand())) {
System.out.println("test");
}
}
public void initUI() {
northFlowLayoutPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
northFlowLayoutPanel.add(userInput);
userInput.setPreferredSize(new Dimension(150,100));
centerFlowLayoutPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
centerFlowLayoutPanel.add(reverse);
southFlowLayoutPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
southFlowLayoutPanel.setBorder(BorderFactory.createTitledBorder("Output text"));
southFlowLayoutPanel.add(reverseOutput);
reverseOutput.setPreferredSize(new Dimension(150,100));
JFrame frame = new JFrame("Backwardizer");
frame.setLayout(new BorderLayout()); // This is the default layout
frame.add(northFlowLayoutPanel, BorderLayout.PAGE_START);
frame.add(centerFlowLayoutPanel, BorderLayout.CENTER);
frame.add(southFlowLayoutPanel, BorderLayout.PAGE_END);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
frame.setSize(750, 500);
}
Any ideas how to either move the cursor to the start of the box (it shows up in the middle as of now) or a better way to accomplish what I'm trying to do?
For the reversing aspect, you can add the text from the first box to a string builder
StringBuilder rev = new StringBuilder(firstBox.getText());
String reversedText = rev.reverse().toString();
secondBox.setText(reversedText);
Something along those line should get the desired result if you nest it in the button action.
Any ideas how to either move the cursor to the start of the box (it shows up in the middle as of now) or a better way to accomplish what I'm trying to do?
JTextField#setCaretPosition, call this AFTER you've updated the text of the field
Make the field readonly, JTextField#setEditable and pass it false
Additionally, you could use a JList or JTextArea if you want to store multiple rows/lines of text
You should also avoid using setPreferredSize, see Should I avoid the use of set(Preferred|Maximum|Minimum)Size methods in Java Swing? for more details
My JFrame Consists of three main parts a banner at top scrollpane containing a JTextArea center and a JTextField at the bottom. When I re-size the frame I adjust the columns and rows in my JTextArea. When making the frame larger the JTextArea expands visually but removes the scroll-bar. Then if I make the frame smaller the JTextArea stays the same size. This Is where I attempt to re-size my JTextArea.
frame.addComponentListener(new ComponentAdapter() {//Waits for window to be resized by user
public void componentResized(ComponentEvent e) {
uneditTextArea.setRows(((int)((frame.getHeight()-140)/18.8)));//sets Textarea size based on window size
uneditTextArea.setColumns(((int)((frame.getWidth()-100)/10.8)));
frame.revalidate();//refreshes screen
}
});
Why would the ScrollPane not re adjust to the change in size of the TextField.
The Rest of the code is below in case it is needed.
public class window extends JFrame
{
private static JFrame frame = new JFrame("Lillian");
private static JButton inputButton = new JButton("Send");
private static JTextField editTextArea = new JTextField(46);
private static JTextArea uneditTextArea = new JTextArea(26,50);
private static JPanel logoPanel = new JPanel();//Input text window
private static JPanel itextPanel = new JPanel();//Input text window
private static JPanel submitPanel = new JPanel();//Submit Button
private static JPanel bottom = new JPanel();//will contain scrollpane
private static JPanel middle = new JPanel();//willcontain itextpanel & submitbutton
private static JPanel otextPanel = new JPanel();//Text Output
public static void runWindow()
{
ImageIcon logo = new ImageIcon("Lillian_resize.png");//banner
ImageIcon icon = new ImageIcon("Lillian_icon.png");//application icon
frame.setIconImage(icon.getImage());
frame.setSize(660,640);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
logoPanel.setSize(10,10);
JLabel logoLabel = new JLabel(logo);
final JScrollPane scrollPane = new JScrollPane(otextPanel);//adds text to panel will scrollbar
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);//scrollbar only apears when more text than screen
scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);//scrollbar never apears
scrollPane.setBorder(BorderFactory.createEmptyBorder());
logoPanel.add(logoLabel);
submitPanel.add(inputButton);
itextPanel.add(editTextArea);
otextPanel.add(uneditTextArea);
frame.getContentPane().add(logoPanel,"North");
frame.getContentPane().add(middle);
frame.getContentPane().add(bottom,"South");
middle.add(scrollPane,"North");//adds panels to outer panel
bottom.add(itextPanel, "West");
bottom.add(submitPanel, "East");
uneditTextArea.setLineWrap(true);
uneditTextArea.setWrapStyleWord(true);
uneditTextArea.setEditable(false);
uneditTextArea.setCaretPosition(uneditTextArea.getDocument().getLength());
frame.revalidate();//refreshes screen
//---------------wait for action------------
frame.addComponentListener(new ComponentAdapter() {//Waits for window to be resized by user
public void componentResized(ComponentEvent e) {
uneditTextArea.setRows(((int)((frame.getHeight()-140)/18.8)));//sets Textarea size based on window size
uneditTextArea.setColumns(((int)((frame.getWidth()-100)/10.8)));
frame.revalidate();//refreshes screen
}
});
}
}
There should be no need to use a ComponentListener to resize components. That is the job of the layout managers that you use to dynamically resize the components.
You should not be adding the text area to a JPanel first. Instead when using text areas you would generally add the text area directly to the viewport of a JScrollPane by using code like:
JScrollPane scrollPane = new JScrollPane( textArea );
Then you add the scrollpane to the frame with code like:
frame.add(scrollPane, BorderLayout.CENTER);
As you have noticed you should also NOT use hardcoded literals like "Center". Instead use the variables provided by the layout manager. Since you are using a BorderLayout, use the variables defined in the BorderLayout class.
Also, you should NOT be using static variable to create your GUI. I suggest you read the section from the Swing tutorial on Layout Manager. The tutorial will give you more information and the example code will show you how to better structure your program so that you don't need to use static variables.
I am just trying to add a vertical scroll bar to my TextField and TextArea.
I am using a ScrollPane and it should create avertical/horizontal scroll bar by default.
Problem:
I need a vertical scroll bar to see the data which is not visible.
In the start a vertical scrollbar appears but when the data increases the vertical scrollbar changes to a horizontal scroll bar.
Also the TextField disappears and only a horizontal scrollbar appears in its place.
I guess it is because how I have set the bounds but I tried changing the bounds and it ends up completely doing away with the TextField.
My code snippet:
public JTextField inputField = new JTextField();
public JTextArea talkArea = new JTextArea();
public JScrollPane inputFieldScroll = new JScrollPane(inputField);
public JScrollPane talkAreaScroll = new JScrollPane(talkArea);
talkArea.setEditable(false);
talkArea.setBackground(Color.white);
talkAreaScroll.setBounds(new Rectangle(TALK_LEFT, TALK_TOP, TALK_WIDTH, TALK_HEIGHT));
this.getContentPane().add(talkAreaScroll, null);
//set input area
inputField.setBackground(Color.white);
inputField.setBounds(new Rectangle(INPUT_LEFT, INPUT_TOP, INPUT_WIDTH, INPUT_HEIGHT));
inputFieldScroll.setVerticalScrollBar(new JScrollBar());
inputFieldScroll.setBounds(new Rectangle(INPUT_LEFT, INPUT_TOP, INPUT_WIDTH, INPUT_HEIGHT));
Question:
Is there some parameter I need to set so that it remains a vertical scroll bar?
Why does the input scroll bar occupy the whole inputfield when the data becomes a huge line? It appears as a proper vertical scrollbar in the start.
Any advice appreciated.
Thanks
Below is a small compilable code snippet I mentioned above. I agree with camickr that you should not be using absolute positioning but rather use the layout managers. If you absolutely need to have a horizontal scrollbar for the JTextField, then one way to get it to work is to have it show up always, using the JScrollPane constructor that allows for this. i.e,
JScrollPane inputPane = new JScrollPane(inputField, JScrollPane.VERTICAL_SCROLLBAR_NEVER,
JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
For e.g.,
import java.awt.*;
import javax.swing.*;
public class FuSwing1b extends JPanel {
private static final int TA_ROWS = 25;
private static final int TA_COLS = 60;
private JTextField inputField = new JTextField();
private JTextArea talkArea = new JTextArea(TA_ROWS, TA_COLS);
public FuSwing1b() {
talkArea.setEditable(false);
talkArea.setFocusable(false);
talkArea.setBackground(Color.white);
//talkArea.setPreferredSize(new Dimension(TALK_WIDTH, TALK_HEIGHT));
JScrollPane talkPane = new JScrollPane(talkArea, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
JScrollPane inputPane = new JScrollPane(inputField, JScrollPane.VERTICAL_SCROLLBAR_NEVER,
JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
int gap = 10;
setLayout(new BorderLayout(gap, gap));
add(talkPane, BorderLayout.CENTER);
add(inputPane, BorderLayout.SOUTH);
setBorder(BorderFactory.createEmptyBorder(gap , gap, gap, gap));
}
private static void createAndShowUI() {
JFrame frame = new JFrame("FuSwing1b");
frame.getContentPane().add(new FuSwing1b());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
createAndShowUI();
}
});
}
}
Don't play with the bounds. Use a layout manager and you won't have to worry about this.
When you create the text field use something like:
JTextField textField = new JTextField(10);
This will create a text field that will hold a minimum of 10 characters. If the number of characters exceeds the display width of the text field the use can see the remaining characters by using the right/left arrow keys. That is the normal UI used by all applications I have ever seen. Don't try to create your own UI by using a horizontal scrollbar. Users are not accustomed to that.
for the text area you can create it using:
JTextArea textArea = new JTextArea(5, 30);
JScrollPane scrollPane = new JScrollPane( textArea );
to create a text area with 5 rows and approximately 30 character per row.
Now add the text field and the scrollpane to your frame "using layout managers" and then pack the frame. The layout managers will determine the best size for the compoents. Scrollbars will automatically appear on the text area as you add text to it and the text exceeds 5 lines.