Aligning icon to the left in JTabbedPane in Nimbus Look and Feel

问题

I was creating an application with JTabbedPane using Nimbus look and feel

I have used this code to place tabs:

pane.addTab("Welcome",new ImageIcon("resources\\1.png"),mainPanel,"Takes to the welcome page");

I want the icon to appear on the left and

回答1:

You can set a custom component for rendering the tab title, through JTabbedPane.setTabComponentAt(int index, Component component) method:

Sets the component that is responsible for rendering the title for the specified tab. A null value means JTabbedPane will render the title and/or icon for the specified tab. A non-null value means the component will render the title and JTabbedPane will not render the title and/or icon.

Note: The component must not be one that the developer has already added to the tabbed pane.

For instance you can do this:

JLabel label = new JLabel("Tab1");
label.setHorizontalTextPosition(JLabel.TRAILING); // Set the text position regarding its icon
label.setIcon(UIManager.getIcon("OptionPane.informationIcon"));

JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.LEFT);
tabbedPane.addTab(null, new JPanel());
tabbedPane.setTabComponentAt(0, label); // Here set the custom tab component

Screenshot 1:

Note: using this feature you can set any Component as you wish. For instance you can make a JPanel with a JButton to close the tab:

final JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.LEFT);

ActionListener actionListener = new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent e) {
        JButton button = (JButton)e.getSource();
        for(int i = 0; i < tabbedPane.getTabCount(); i++) {
            if(SwingUtilities.isDescendingFrom(button, tabbedPane.getTabComponentAt(i))) {
                tabbedPane.remove(i);
                break;
            }
        }
    }
};

JLabel label = new JLabel("Tab1", UIManager.getIcon("OptionPane.informationIcon"), JLabel.RIGHT);        
JButton closeButton = new JButton("X");
closeButton.addActionListener(actionListener);

JPanel tabComponent = new JPanel(new BorderLayout());
tabComponent.add(label, BorderLayout.WEST);
tabComponent.add(closeButton, BorderLayout.EAST);

tabbedPane.addTab(null, new JPanel());
tabbedPane.setTabComponentAt(0, tabComponent); // Here set the custom tab component

Screenshot 2:

Update

You might want to see this topic as well: JTabbedPane: tab placement set to LEFT but icons are not aligned

回答2:

There is a simpler solution using HTML formatting. This is an example using html code to format text, but you can also format other elements within the tab:

final String PRE_HTML = "<html><p style=\"text-align: left; width: 230px\">"; 
final String POST_HTML = "</p></html>"; 

tabbedpane.setTitleAt(0, PRE_HTML + "your title" + POST_HTML);
tabbedpane.setTitleAt(2, PRE_HTML + "your title 2" + POST_HTML);

来源：https://stackoverflow.com/questions/19787146/aligning-icon-to-the-left-in-jtabbedpane-in-nimbus-look-and-feel

标签

java

swing

user-interface

jtabbedpane

nimbus