3、BorderLayout邊界佈局管理器
BorderLayout把容器分爲東、南、西、北、中五個區域,每個組件將佔據一個區域。這五個區域分別被命名爲NORTH、WEST、EAST、SOUTH、CENTER,五個區域使用五個靜態常量來標示。
常量 |
說明 |
public static final String NORTH=”North” |
內容面板北邊 |
public static final String WEST=”West” |
內容面板西邊 |
public static final String EAST=”East” |
內容面板東邊 |
public static final String CENTER=”Center” |
內容面板中間 |
public static final String SOUTH=”South” |
內容面板南邊 |
案例1:完成如下圖所示的窗口設計
public class SwingLayoutDemo {
private JFrame mainFrame;
private JLabel headerLabel;
private JLabel statusLabel;
private JPanel controlPanel;
private JLabel msglabel;
public SwingLayoutDemo(){
prepareGUI();
}
public static void main(String[] args){
SwingLayoutDemo swingLayoutDemo = new SwingLayoutDemo();
swingLayoutDemo.showBorderLayoutDemo();
}
private void prepareGUI(){
mainFrame = new JFrame("Java SWING Examples");
mainFrame.setSize(400,400);
mainFrame.setLayout(new GridLayout(3, 1));
headerLabel = new JLabel("",JLabel.CENTER );
statusLabel = new JLabel("",JLabel.CENTER);
statusLabel.setSize(350,100);
mainFrame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent windowEvent){
System.exit(0);
}
});
controlPanel = new JPanel();
controlPanel.setLayout(new FlowLayout());
mainFrame.add(headerLabel);
mainFrame.add(controlPanel);
mainFrame.add(statusLabel);
mainFrame.setVisible(true);
}
private void showBorderLayoutDemo(){
headerLabel.setText("Layout in action: BorderLayout");
JPanel panel = new JPanel();
panel.setBackground(Color.darkGray);
panel.setSize(300,300);
BorderLayout layout = new BorderLayout();
layout.setHgap(10);
layout.setVgap(10);
panel.setLayout(layout);
panel.add(new JButton("Center"),BorderLayout.CENTER);
panel.add(new JButton("Line Start"),BorderLayout.LINE_START);
panel.add(new JButton("Line End"),BorderLayout.LINE_END);
panel.add(new JButton("East"),BorderLayout.EAST);
panel.add(new JButton("West"),BorderLayout.WEST);
panel.add(new JButton("North"),BorderLayout.NORTH);
panel.add(new JButton("South"),BorderLayout.SOUTH);
controlPanel.add(panel);
mainFrame.setVisible(true);
} }