My code shows a button inside a textbox, but when the input value changes, the size of the text box also changes. That I don't like. Is there any solution such that the textbox size remains fixed? Or any other idea on how to create a button inside textbox?
The following is my code:
JPanel panel = new JPanel();
panel.setLayout( new FlowLayout(FlowLayout.CENTER, 0, 0) );
panel.add(textField);
panel.add(button);
panel.setBackground( textField.getBackground() );
panel.setBorder( textField.getBorder() );
textField.setBorder(null);
Try a BorderLayout and add the textfield at BorderLayout.CENTER and the button at BorderLayout.EAST.
I tried your code, and it seemed to work fine for me, with a slight modification. It may be that panel is resizing itself, not textField. Try wrapping panel in another JPanel to force its shape.
JPanel panel = new JPanel();
JPanel outerPanel = new JPanel();
panel.setLayout( new FlowLayout(FlowLayout.CENTER, 0, 0) );
panel.add(textField);
panel.add(button);
panel.setBackground( textField.getBackground() );
panel.setBorder( textField.getBorder() );
textField.setBorder(null);
outerPanel.add(panel);
Your example appears to be the second alternative discussed in the article Component Border. Instead, you may want to install() a ComponentBorder, a third alterative described later in the same article.
Is there any solution such that the textbox size remains fixed?
I'm guessing you are creating the JTextField like:
JTextField textField = new JTextField();
In this case the text field size changes as you add text to it.
Instead you should use:
JTextField textField = new JTextField(10);
and the text field will remain a constant size an hold a minimum of 10 characters before scrolling.
Use a different Layout, or try absolute positioning
Related
I'm busy writing a button menu for a Java Swing application and I am wondering if it is possible to remove the padding between JButtons that are added to a JPanel.
The JPanel uses a FlowLayout that is aligned left.
JPanel panelMenu = new JPanel(new FlowLayout(FlowLayout.LEFT));
The buttons are standard JButtons
JButton buttOne = new JButton("One");
JButton buttTwo = new JButton("Two");
I added the JButtons to the panel as normal
add(panelMenu, BorderLayout.NORTH);
panelMenu.add(buttOne);
panelMenu.add(buttTwo);
Everything works as expected but what do I need to do to remove the default spacing between the buttons?
I found a suggested solution online which is the following
buttOne.setBorder(null);
buttOne.setBorderPainted(false);
buttOne.setMargin(new Insets(0,0,0,0));
buttTwo.setBorder(null);
buttTwo.setBorderPainted(false);
buttTwo.setMargin(new Insets(0,0,0,0));
However this seems to remove the spacing inside of the button and not the spacing between each button.
Is this spacing produced by the FlowLayout? If so, how can I remove it?
// 0, 0 equates to horizontal and vertical offsets, the default is 5.
JPanel panelMenu = new JPanel(new FlowLayout(FlowLayout.LEFT, 0, 0));
Should sort it!
The FlowLayout controls the spacing, the default is 5.
Use new FlowLayout(FlowLayout.LEFT, 0) to remove the spacing.
the jscrollpane that I am adding doesnt appearin my textarea
textArea = new JTextArea();
scroll = new JScrollPane(textArea);
scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
this.add(textArea);
this.add(scroll);
this.setSize(1000, 600);
this.setLayout(new BorderLayout());
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
textArea = new JTextArea();
scroll = new JScrollPane(textArea);
//this.add(textArea); // get rid of this
this.add(scroll);
You create the scrollpane with the text area, but then the next statement removes the text area from the scrollpane because a component can only have a single parent.
Get rid of that statement and just add the scrollpane to the frame.
Then scrollbars will appear automatically as you add data to the text area.
Also you should create the text area using something like:
textArea = new JTextArea(5, 20);
to give a suggestion on how big to make the text area.
I did what you said but still nothing happens
Another problem is that you need to set the layout manager BEFORE you start adding components to the frame (or panel).
Remove this.add(textArea); and add scroll.setSize( 100, 100 ); will also work for you.
I want to make my JTextArea field as big as it can be in current JPanel. How to do that?
Now it is like this:
JPanel statusBar = new StatusBar(project);
JTextArea outputBox = new JTextArea(1, 50);
outputBox.setEditable(true);
statusBar.add(outputBox);
The default layout manager of JPanel is FlowLayout, which wouldn't let the text area fill the entire available space in the panel.
Using BorderLayout should work well:
statusBar.setLayout( new BorderLayout() );
JTextArea outputBox = new JTextArea(1, 50);
outputBox.setEditable(true);
statusBar.add(outputBox, BorderLayout.CENTER);
You need a layout manager on the JPanel. If its just the JTextArea contained within it and you need to maximise it you can use a simple GridLayout:
statusBar.setLayout(new GridLayout(1,1));
I have a JPanel that looks something like this:
JPanel panel = new JPanel();
panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
...
panel.add(jTextField1);
panel.add(Box.createVerticalStrut(10));
panel.add(jButton1);
panel.add(Box.createVerticalStrut(30));
panel.add(jTextField2);
panel.add(Box.createVerticalStrut(10));
panel.add(jButton2);
... //etc.
My problem is that the JTextFields become huge vertically. I want them to only be high enough for a single line, since that is all that the user can type in them. The buttons are fine (they don't expand vertically).
Is there any way to keep the JTextFields from expanding? I'm pretty new to Swing, so let me know if I'm doing everything horribly wrong.
textField = new JTextField( ... );
textField.setMaximumSize( textField.getPreferredSize() );
If you want the width to keep changing, just keep it set to MAX INT. So...
textField.setMaximumSize(
new Dimension(Integer.MAX_VALUE, textField.getPreferredSize().height) );
In my case I need a combination of all the answers for it to work properly. If I don't use glue, it is not centered vertically; if I don't restrict maximum size, it extends vertically; if I restrict both width and height, it is too small, being only wide enough to contain the initialization text.
textField = new JTextField("Hello, world!");
textField.setMaximumSize(
new Dimension(Integer.MAX_VALUE,
textField.getPreferredSize().height));
Box box = Box.createVerticalBox();
box.add(Box.createVerticalGlue());
box.add(textField);
box.add(Box.createVerticalGlue());
set the max height.
or put them in a scroll region
JPanel panel = new JPanel();
Box box = Box.createVerticalBox();
JTextField tf = new JTextField(8);
box.add(tf);
panel.add(box);
frame.getContentPane().add(panel, BorderLayout.CENTER);
I have a question about laying out some swing components.
Say, I have a JPanel which contains a JLabel and a JTextField. I want JLabel to be drawn on the left-most side of JPanel, and JTextField to be drawn on the right-most side of JPanel. I tried using BoxLayout and Horizontal Glues, but I couldn't make it work. Can somebody explain how this should be done? And by the way, I also should be able to set the JTextField's size, which will grow from right to left.
EDIT: Here is my class, it's pretty simple.
public class TextField extends JPanel {
private JLabel label;
private JTextField textField;
public TextField(String labelText){
this.label = new JLabel(labelText);
this.textField = new JTextField("");
Box horizontalBox = Box.createHorizontalBox();
horizontalBox.add(label);
horizontalBox.add(Box.createHorizontalGlue());
horizontalBox.add(textField);
add(horizontalBox);
}
}
One of the best ways to debug swing UIs is to add visible borders to your components to get a better idea of what is going on.
Try adding this after you create the horizontalBox:
horizontalBox.setBorder(BorderFactory.createLineBorder(Color.black));
Most likely what you will find is that your TextField is shrunk to the absolute minimum size required to display whatever text you pass to the constructor and the minimum size of the JTextField (which is basically just one visible character space).
Now try adding this to the constructor:
horizontalBox.setPreferredSize(new Dimension(400, 40));
Then try replacing the glue with a strut:
horizontalBox.add(Box.createHorizontalStrut(30));
That said, I think the biggest issue is that you are using a JPanel and then adding a box component to it, which makes resizing of the component problematic.
Try this and see if it works for you:
public TextField(String labelText){
this.label = new JLabel(labelText);
this.textField = new JTextField("");
this.setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
this.setBorder(BorderFactory.createLineBorder(Color.black)); // debug
this.add(label);
this.add(Box.createHorizontalStrut(30));
this.add(textField);
}
[p.s.]
You really want to reconsider the name of that JPanel extension. Perhaps TextFieldDisplay or TextFieldPanel would be more appropriate.
You could also use border layout and add the label using the BorderLayout.WEST option and the TextField using the BorderLayout.EAST option.
I tried using BoxLayout and
Horizontal Glues, but I couldn't make
it work. Can somebody explain how this
should be done?
There is no trick to this. Read the Swing tutorial on How to Use Box Layout for a working example.
If it still doesn't work then you need to post your SSCCE because we can't guess what you might be doing wrong.
To use BoxLayout:
public TextField(String labelText){
this.label = new JLabel(labelText);
this.textField = new JTextField("");
this.setLayout( new BoxLayout( this, BoxLayout.X_AXIS ) );
this.add( label );
this.add( Box.createHorizontalGlue() );
this.add( textField );
}
I like to use GridBagLayout for panels that have either complex layouts or components that should "fill" part of the panel.
JPanel panel = new JPanel();
JLabel label = new JLabel( "Enter your text:" );
JTextField textField = new JTextField();
panel.setLayout( new GridBagLayout() );
panel.add( label,
new GridBagConstraints( 0, 0, 1, 1, 0.0, 0.0,
GridBagConstraints.EAST, GridBagConstraints.NONE,
new Insets( 0, 0, 0, 0 ), 0, 0 ) );
panel.add( textField,
new GridBagConstraints( 1, 0, 1, 1, 1.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL,
new Insets( 0, 0, 0, 0 ), 0, 0 ) );
You can find a good explanation of how you use GridBagLayout here.
The problem with the code that you posted isn't so much the BoxLayout, it's the layout that contains it. By default, JPanel uses FlowLayout. When you add a component to a FlowLayout it does not expand to fill all of the available space.
So, instead of adding a Box to the panel, either make the class extend Box or set the panel layout to BoxLayout and add the components directly.
Set your JPanel to use BorderLayout. This, in combination with Box will give you almost any layout you need.