JavaSwing中设置窗口居中、焦点遍历

发布于：2021年8月23日

设置在Swing界面中使用Tab键或回车键在多个输入框中进行导航

//使窗口居中
this.setLocationRelativeTo(null);
 
btnWeightUnit.setEnabled(false);
btnDimUnit.setEnabled(false);
 
//设置焦点遍历键
AWTKeyStroke keyEnter = AWTKeyStroke.getAWTKeyStroke(KeyEvent.VK_ENTER, 0);
AWTKeyStroke keyTab = AWTKeyStroke.getAWTKeyStroke(KeyEvent.VK_TAB, 0);
 
Set<AWTKeyStroke> set = new HashSet<>(1);
set.add(keyEnter);
set.add(keyTab);
this.setFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, set);
 
//设置焦点遍历策略
List<Component> comList = new ArrayList<>();
comList.add(txtLabel);
comList.add(txtWeight);
comList.add(txtDimL);
comList.add(txtDimW);
comList.add(txtDimH);
 
FocusTraversalPolicy policy = new FocusTraversalPolicy() {
    @Override
    public Component getFirstComponent(Container focusCycleRoot) {
        return (Component) comList.get(0);
    }
 
    @Override
    public Component getLastComponent(Container focusCycleRoot) {
        return (Component) comList.get(comList.size() - 1);
    }
 
    @Override
    public Component getComponentAfter(Container focusCycleRoot,
            Component aComponent) {
        int index = comList.indexOf(aComponent);
 
        return (Component) comList.get((index + 1) % comList.size());
    }
 
    @Override
    public Component getComponentBefore(Container focusCycleRoot,
            Component aComponent) {
        int index = comList.indexOf(aComponent);
        return (Component) comList.get((index - 1 + comList.size()) % comList.size());
    }
 
    @Override
    public Component getDefaultComponent(Container focusCycleRoot) {
        return (Component) comList.get(0);
    }
};
this.setFocusTraversalPolicy(policy);