Set jpanel to JFrame size explicitly
I have JPanel
a border, the problem is that when I add a panel to JFrame
, it takes the size of the panel, although I set the preferred size for the panel with setPreferredSize
. The frame layout is "BoxLayout", and here's the code:
public class ActionForm extends JFrame {
JPanel namePanel;
JPanel descPanel;
JLabel actionName;
JLabel nameLabel;
JTextField nameTextField, descTextField;
FlowLayout toolBarLayout = new FlowLayout();
public ActionForm() {
this.setLayout(new BoxLayout(this.getContentPane(), BoxLayout.Y_AXIS));
TitledBorder nameBorder= BorderFactory.createTitledBorder(
"Change Description");
nameBorder.setTitleJustification(TitledBorder.LEFT);
namePanel = new JPanel(toolBarLayout);
namePanel.setPreferredSize(new Dimension(150, 150));
nameLabel = new JLabel("ButtonName");
nameTextField = new JTextField("Action Name", 50);
namePanel.add(nameLabel);
namePanel.add(nameTextField);
namePanel.setBorder(nameBorder);
namePanel.setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT);
this.add(namePanel);
}
public static void main(String[] args) {
ActionForm form = new ActionForm();
form.setVisible(true);
form.setSize(970, 500);
form.setResizable(false);
}
}
Why isn't the panel resizing?
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-
BoxLayout
, the hostMin/Max/preferredSize
who came fromJComponents
, set by thisLayoutManager
-
(I don't want to comment on anything because my answer is going to be so long) please, to compare your code with this example code, all good (required and important) are implemented
Swing rulles
eg
import java.awt.ComponentOrientation;
import java.awt.Dimension;
import java.awt.FlowLayout;
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.border.TitledBorder;
public class ActionForm {
private static final long serialVersionUID = 1L;
private JFrame frame;
private JPanel namePanel;
private JLabel nameLabel;
private JTextField nameTextField;
private FlowLayout toolBarLayout = new FlowLayout();
public ActionForm() {
TitledBorder nameBorder = BorderFactory.createTitledBorder(
"Change Description");
nameBorder.setTitleJustification(TitledBorder.LEFT);
namePanel = new JPanel(toolBarLayout);
namePanel.setPreferredSize(new Dimension(150, 150));// hardCoded sizing
namePanel.setMaximumSize(new Dimension(250, 150)); // hardCoded sizing
namePanel.setMinimumSize(new Dimension(150, 150)); // hardCoded sizing
nameLabel = new JLabel("ButtonName");
nameTextField = new JTextField("Action Name", 10);
namePanel.add(nameLabel);
namePanel.add(nameTextField);
namePanel.setBorder(nameBorder);
namePanel.setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT);
frame = new JFrame("Mix / Max / PreferredSize for BoxLayout");
frame.getContentPane().setLayout(new BoxLayout(frame.getContentPane(),
BoxLayout.Y_AXIS)); // otherwise nice exceptions java.awt.AWTError:
// BoxLayout can't be shared
frame.add(namePanel);
frame.setPreferredSize(new Dimension(970, 500));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
ActionForm form = new ActionForm();
}
});
}
}
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