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Here are the steps to follow to use a scroll pane: 1 Create the component to be scrolled 2 Create an instance of JScrollPane, passing to it the object to scroll 3 Add the scroll pane to the content pane
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JScrollPane defines several constructors The one used by this recipe is shown here: JScrollPane(Component comp) The component to be scrolled is specified by comp Scroll bars are automatically displayed when the content of the pane exceeds the dimensions of the viewport Because JScrollPane automates scrolling for the specified component, no other actions need be provided by your program
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The following example demonstrates JScrollPane To do so, it uses a scroll pane to handle two common situations First, it uses a scroll pane to scroll the contents of a label that
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contains a large, multiline string Second, it uses a scroll pane to scroll the contents of a Box, which is a lightweight container that uses BoxLayout
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// Demonstrate JScrollPane import javaxswing*; import javaawt*; class SPDemo { SPDemo() { // Create a new JFrame container JFrame jfrm = new JFrame("Use JScrollPane"); // Set the layout manager to FlowLayout jfrmsetLayout(new FlowLayout()); // Give the frame an initial size jfrmsetSize(240, 250); // Terminate the program when the user closes the application jfrmsetDefaultCloseOperation(JFrameEXIT_ON_CLOSE); // Create a long, HTML-based label JLabel jlab = new JLabel("<html>JScrollPane provides an easy way to<br>" + "handle situations in which a component is<br>" + "(or might be) too large for the available<br>" + "space Wrapping the component in a scroll<br>" + "pane is a convenient solution<br><br>" + "JScrollPane is especially useful for scrolling<br>" + "tables, lists, images, or the contents of<br>" + "lightweight containers, such as JPanel or Box"); // Create a scroll pane and have it scroll the label JScrollPane jscrlpLabel = new JScrollPane(jlab); // Set the preferred size of the scroll pane that holds the label jscrlpLabelsetPreferredSize(new Dimension(200, 100));
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// Next, use a scroll pane to scroll the contents of a Box // A Box is a lightweight container that uses BoxLayout // First, create some components that will be contained // within the box JLabel jlabSelect = new JLabel("Select Languages"); JCheckBox jrbEn = new JCheckBox("English"); JCheckBox jrbFr = new JCheckBox("French"); JCheckBox jrbGe = new JCheckBox("German"); JCheckBox jrbCh = new JCheckBox("Chinese"); JCheckBox jrbSp = new JCheckBox("Spanish");
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Swing
// No event handlers are needed for this example, but // you can try adding some on your own, if you wish // Create a Box container to hold the language choices Box box = BoxcreateVerticalBox(); // Add components to the box boxadd(jlabSelect); boxadd(jrbEn); boxadd(jrbFr); boxadd(jrbGe); boxadd(jrbCh); boxadd(jrbSp); // Create a scroll pane that will hold the box JScrollPane jscrlpBox = new JScrollPane(box); // Set the size of the scroll pane that holds the box jscrlpBoxsetPreferredSize(new Dimension(140, 90)); // Add both scroll panes to the content pane jfrmadd(jscrlpLabel); jfrmadd(jscrlpBox); // Display the frame jfrmsetVisible(true); } public static void main(String args[]) { // Create the frame on the event dispatching thread SwingUtilitiesinvokeLater(new Runnable() { public void run() { new SPDemo(); } }); } }
The output is shown here:
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JScrollPane is commonly used to provide scrolling for a JList or a JTable See Work with JList and Display Data in a JTable for additional examples
Options and Alternatives
Like most Swing components, JScrollPane supports many options and customizations Perhaps the most common enhancement is the addition of headers JScrollPane supports both a column header and a row header You can use either or both A header can consist of any type of component This means that you are not limited to only passive labels; a header can contain active controls, such as a push button The easiest way to set a row header is to call setRowHeaderView( ), shown here: void setRowHeaderView(Component comp) Here, comp is the component that will be used as a header The easiest way to set a column header is to call setColumnHeaderView( ), shown next: void setColumnHeaderView(Component comp) Here, comp is the component that will be used as a header When using headers, it is sometimes useful to include a border around the viewport This is easily accomplished by calling setViewportBorder( ), which is defined by JScrollPane It is shown here: void setViewportBorder(Border border) Here, border specifies the border Standard borders can be created by using the BorderFactory class To see the effect of headers and a border, try adding the following code to the example It adds row and column headers to the jscrlpBox scroll pane and puts a border around its viewport Insert the code immediately after jscrlpBox is created
jscrlpBoxsetColumnHeaderView( new JLabel("Internationalization", JLabelCENTER)); jscrlpBoxsetRowHeaderView(new JLabel(" "));
jscrlpBoxsetViewportBorder( BorderFactorycreateLineBorder(ColorBLACK));
Notice that the row and column headers are instances of JLabel; however, another type of component, such as JButton, could be used Also notice that the label for the row header is simply a string containing spaces It is used to balance the visual look of the scroll pane After making these additions, jscrlpBox now looks like this:
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