Java 跨多个JPanel的摇摆焦点策略
我有两个Java 跨多个JPanel的摇摆焦点策略,java,swing,focus,Java,Swing,Focus,我有两个JPanel对象,它们包含多个组件。 每个面板都有自己的焦点策略 我想从第一个面板的第一个组件开始聚焦循环。 当焦点到达第一个面板的最后一个组件时,当我按Tab键时,焦点应跳到第二个面板的第一个组件 在两个面板上,都启用了FocusTraversalPolicyProvider 这是怎么回事 public class Panel1 extends JPanel{ private JTextField text1; private JTextField text2;
JPanel
对象,它们包含多个组件。
每个面板都有自己的焦点策略
我想从第一个面板的第一个组件开始聚焦循环。
当焦点到达第一个面板的最后一个组件时,当我按Tab键时,焦点应跳到第二个面板的第一个组件
在两个面板上,都启用了FocusTraversalPolicyProvider
这是怎么回事
public class Panel1 extends JPanel{
private JTextField text1;
private JTextField text2;
public JPanel1(){
init();
}
private void init(){
text1 = new JTextField();
text2 = new JTextField();
this.setLayout(new FlowLayout());
this.add(text1);
this.add(text2);
this.setFocusTraversalPolicyProvider(true);
this.setFocusTraversalPolicy(new SimpleFocusTraversalPolicy(
text1,
text2
));
}
}
public class Panel2 extends JPanel{
private JTextField text1;
private JTextField text2;
public JPanel2(){
init();
}
private void init(){
text1 = new JTextField();
text2 = new JTextField();
this.setLayout(new FlowLayout());
this.add(text1);
this.add(text2);
this.setFocusTraversalPolicyProvider(true);
this.setFocusTraversalPolicy(new SimpleFocusTraversalPolicy(
text1,
text2
));
}
}
public class ContainerPanel extends JPanel{
private JPanel panel1, panel2;
public ContainerPanel(){
init();
}
private void init(){
panel1 = new Panel1();
panel2 = new Panel2();
this.setLayout(new FlowLayout());
this.add(panel1);
this.add(panel2);
/*
what should I do here to jump from panel1 to panel2 after the last component of panel1?
*/
}
}
您可能可以重写
FocusTraversalPolicy#getComponentAfter(…)
方法:
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.util.List;
import javax.swing.*;
public class SimpleFocusTraversalPolicyTest {
private JComponent makeUI() {
JTextField t1 = new JTextField("3", 12);
JTextField t2 = new JTextField("1", 12);
JTextField t3 = new JTextField("4", 12);
JTextField t4 = new JTextField("2", 12);
JPanel p1 = new JPanel();
p1.setBorder(BorderFactory.createTitledBorder("left"));
p1.setFocusTraversalPolicy(new SimpleFocusTraversalPolicy(t2, t4, t1, t3));
p1.add(t1); p1.add(t2); p1.add(t3); p1.add(t4);
p1.setFocusTraversalPolicyProvider(true);
p1.setFocusCycleRoot(false);
JTextField t5 = new JTextField("4", 12);
JTextField t6 = new JTextField("3", 12);
JTextField t7 = new JTextField("2", 12);
JTextField t8 = new JTextField("1", 12);
JPanel p2 = new JPanel();
p2.setBorder(BorderFactory.createTitledBorder("right"));
p2.setFocusTraversalPolicy(new SimpleFocusTraversalPolicy(t8, t7, t6, t5));
p2.add(t5); p2.add(t6); p2.add(t7); p2.add(t8);
p2.setFocusTraversalPolicyProvider(true);
p2.setFocusCycleRoot(false);
JPanel p = new JPanel(new GridLayout(1, 2));
p.add(p1);
p.add(p2);
return p;
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override public void run() {
createAndShowGUI();
}
});
}
public static void createAndShowGUI() {
JFrame f = new JFrame();
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.getContentPane().add(new SimpleFocusTraversalPolicyTest().makeUI());
f.setSize(320, 240);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}
//There is no SimpleFocusTraversalPolicy in your code, so this is just an example:
class SimpleFocusTraversalPolicy extends FocusTraversalPolicy {
private final List<? extends Component> order;
public SimpleFocusTraversalPolicy(Component... arrays) {
super();
this.order = Arrays.asList(arrays);
}
@Override public Component getFirstComponent(Container focusCycleRoot) {
return order.get(0);
}
@Override public Component getLastComponent(Container focusCycleRoot) {
return order.get(order.size() - 1);
}
@Override public Component getComponentAfter(Container focusCycleRoot, Component aComponent) {
int idx = order.indexOf(aComponent) + 1;
if (idx >= order.size() && !focusCycleRoot.isFocusCycleRoot()) {
return null;
} else {
return order.get(idx % order.size());
}
}
@Override public Component getComponentBefore(Container focusCycleRoot, Component aComponent) {
int idx = order.indexOf(aComponent) - 1;
if (idx < 0 && !focusCycleRoot.isFocusCycleRoot()) {
return null;
} else {
return order.get((idx + order.size()) % order.size());
}
}
@Override public Component getDefaultComponent(Container focusCycleRoot) {
return order.get(0);
}
}
import java.awt.*;
导入java.awt.event.*;
导入java.util.*;
导入java.util.List;
导入javax.swing.*;
公共类SimpleFocusTraversalPolicyTest{
私有JComponent makeUI(){
JTextField t1=新的JTextField(“3”,12);
JTextField t2=新的JTextField(“1”,12);
JTextField t3=新的JTextField(“4”,12);
JTextField t4=新的JTextField(“2”,12);
JPanel p1=新的JPanel();
p1.设置顺序(BorderFactory.createTitledBorder(“左”);
p1.setFocusTraversalPolicy(新的简单客户旅行策略(t2、t4、t1、t3));
p1.添加(t1);p1.添加(t2);p1.添加(t3);p1.添加(t4);
p1.setFocusTraversalPolicyProvider(真);
p1.setFocusCycleRoot(假);
JTextField t5=新的JTextField(“4”,12);
JTextField t6=新的JTextField(“3”,12);
JTextField t7=新的JTextField(“2”,12);
JTextField t8=新的JTextField(“1”,12);
JPanel p2=新的JPanel();
p2.设置顺序(BorderFactory.createTitledBorder(“右”);
p2.setFocusTraversalPolicy(新的SimpleFocusTraversalPolicy(t8、t7、t6、t5));
p2.添加(t5);p2.添加(t6);p2.添加(t7);p2.添加(t8);
p2.setFocusTraversalPolicyProvider(真);
p2.setFocusCycleRoot(假);
JPanel p=新的JPanel(新的网格布局(1,2));
p、 添加(p1);
p、 添加(p2);
返回p;
}
公共静态void main(字符串[]args){
invokeLater(新的Runnable(){
@重写公共无效运行(){
createAndShowGUI();
}
});
}
公共静态void createAndShowGUI(){
JFrame f=新的JFrame();
f、 setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f、 getContentPane().add(新的SimpleFocusTraversalPolicyTest().makeUI());
f、 设置大小(320240);
f、 setLocationRelativeTo(空);
f、 setVisible(真);
}
}
//您的代码中没有SimpleFocusTraversalPolicy,因此这只是一个示例:
类SimpleFocusTraversalPolicy扩展了FocusTraversalPolicy{
私人最终列表考虑提供一个演示您的问题的列表。这将减少混乱和更好的响应。您能描述一下现在发生了什么以及您希望发生什么吗?现在您可以看到上面的一个小示例。哦,很抱歉,我忘了添加SimpleFocusTraversalPolicy。我像您一样编写了getComponentAfter方法。但是当我启动应用程序时,在第一个面板的第一个组件上没有焦点。