When does a JTabbedPane set the size of the component inside a tab?
I would like to know how big a component inside a tab is directly after I've added it to a tab in a JTabbedPane.
I thought once I've "added" a component via the JTabbedPane.add(String, Component) method, the Component would be realized with correct sizes.
Where or when should I request the information about how big a component has become inside a tab?
Example:
1. "Add" a tab via the menu.
2. Notice that the size of the panel has not changed even though we see it on the screen.
-Js
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
publicclass TabbedPaneShowingTestextends JFrame
{
//GUI
private JTabbedPane tabbedPane;
private JPanel tabPanel;
//MENU
private JMenuBar mainMenuBar;
private JMenu actionMenu;
private JMenuItem addTabMenuItem;
public TabbedPaneShowingTest()
{
this.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
this.setContentPane(getTabbedPane());
this.setJMenuBar(getMainMenuBar());
this.pack();
this.setVisible(true);
}
//GUI
private JTabbedPane getTabbedPane()
{
if(tabbedPane ==null)
{
tabbedPane =new JTabbedPane();
tabbedPane.setPreferredSize(new Dimension(100,100));
}
return tabbedPane;
}
private JPanel getTabPanel()
{
if(tabPanel ==null)
{
tabPanel =new JPanel();
tabPanel.setBackground(Color.GREEN);
}
return tabPanel;
}
//MENU
private JMenuBar getMainMenuBar()
{
if(mainMenuBar ==null)
{
mainMenuBar =new JMenuBar();
mainMenuBar.add(getActionMenu());
}
return mainMenuBar;
}
private JMenu getActionMenu()
{
if(actionMenu ==null)
{
actionMenu =new JMenu("Action");
actionMenu.add(getAddLineMenuItem());
}
return actionMenu;
}
private JMenuItem getAddLineMenuItem()
{
if(addTabMenuItem ==null)
{
addTabMenuItem =new JMenuItem("Add Tab");
addTabMenuItem.addActionListener(new ActionListener()
{
publicvoid actionPerformed(ActionEvent e)
{
System.out.println("BEFORE TAB SIZE: " + getTabPanel().getWidth() +"," + getTabPanel().getHeight());
getTabbedPane().add("Tab",getTabPanel());
System.out.println("AFTER TAB SIZE: " + getTabPanel().getWidth() +"," + getTabPanel().getHeight());
}
});
}
return addTabMenuItem;
}
publicstaticvoid main(String args[])
{
new TabbedPaneShowingTest();
}
}
