e816. 创建工具栏

A toolbar can be either horizontal or vertical. When the orientation is horizontal, the objects in the toolbar are displayed left-to-right. When the orientation is vertical, the objects in the toolbar are displayed top-to-bottom. This orientation is automatically changed when the toolbar is moved to the top or side of a container.

    // Create a horizontal toolbar
    JToolBar toolbar = new JToolBar();
    
    // Create a vertical toolbar
    toolbar = new JToolBar(null, JToolBar.VERTICAL);
    
    // Get current orientation
    int orient = toolbar.getOrientation();

The following code adds various buttons to the toolbar:

    // Get icon
    ImageIcon icon = new ImageIcon("icon.gif");
    
    // Create an action with an icon
    Action action = new AbstractAction("Button Label", icon) {
        // This method is called when the button is pressed
        public void actionPerformed(ActionEvent evt) {
            // Perform action
        }
    };
    
    
    // Add a button to the toolbar; remove the label and margin before adding
    JButton c1 = new JButton(action);
    c1.setText(null);
    c1.setMargin(new Insets(0, 0, 0, 0));
    toolbar.add(c1);
    
    
    // Add a toggle button; remove the label and margin before adding
    JToggleButton c2 = new JToggleButton(action);
    c2.setText(null);
    c2.setMargin(new Insets(0, 0, 0, 0));
    toolbar.add(c2);
    
    
    // Add a combobox
    JComboBox c3 = new JComboBox(new String[]{"A", "B", "C"});
    c3.setPrototypeDisplayValue("XXXXXXXX"); // Set a desired width
    c3.setMaximumSize(c3.getMinimumSize());
    toolbar.add(c3);
    // See also e765 监听组合框中选择不同的项

If the toolbar is to be floatable (see e818 防止工具栏可移动), it must be added to a container with a BorderLayout.

    // Add the toolbar to a frame
    JFrame frame = new JFrame();
    frame.getContentPane().add(toolbar, BorderLayout.NORTH);
    frame.pack();
    frame.setVisible(true);

 

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