[英]JRadioButton selection doesn't show on GUI until visible in Windows LaF
我目前正在處理一個項目,該項目需要在更新正在查看的記錄時更改 JRadioButton 的狀態。
我們有一些客戶向我們抱怨說,當記錄更改時,如果 JRadioButton 不在屏幕上,則在屏幕顯示之前它不會更新。 這種行為似乎是使用 Windows 外觀的結果,因為它在未設置時似乎不會發生。
下面的代碼示例演示了這一點。 默認選擇的 JRadioButton 是“Cat”,因此通過選擇“Dog”JButton,然后將選項卡更改為“Question”,您可以看到 JRadioButton 轉換發生。
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTabbedPane;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
/**
* Example of JRadioButton not updating until it's parent panel becomes visible.
*/
public class RadioButtonExample extends JPanel implements ActionListener {
public static final String CAT = "Cat";
public static final String DOG = "Dog";
private final JRadioButton radCat;
private final JRadioButton radDog;
private final ButtonGroup grpAnimal;
public RadioButtonExample() {
super(new BorderLayout());
JLabel lblQuestion = new JLabel("Are you a cat or dog person?");
radCat = new JRadioButton(CAT);
radCat.setActionCommand(CAT);
radCat.setSelected(true);
radDog = new JRadioButton(DOG);
radDog.setActionCommand(DOG);
grpAnimal = new ButtonGroup();
grpAnimal.add(radCat);
grpAnimal.add(radDog);
JPanel pnlQuestion = new JPanel(new GridLayout(0, 1));
pnlQuestion.add(lblQuestion);
pnlQuestion.add(radCat);
pnlQuestion.add(radDog);
JButton btnSetCat = new JButton(CAT);
btnSetCat.setActionCommand(CAT);
btnSetCat.addActionListener(this);
JButton btnSetDog = new JButton(DOG);
btnSetDog.setActionCommand(DOG);
btnSetDog.addActionListener(this);
JPanel pnlButtons = new JPanel(new GridLayout(0, 1));
pnlButtons.add(new JLabel("Update your choice of animal"));
pnlButtons.add(btnSetCat);
pnlButtons.add(btnSetDog);
JTabbedPane tabPane = new JTabbedPane();
tabPane.addTab("Buttons", pnlButtons);
tabPane.addTab("Question", pnlQuestion);
add(tabPane, BorderLayout.LINE_START);
setBorder(BorderFactory.createEmptyBorder(20,20,20,20));
}
public void actionPerformed(ActionEvent evt) {
SwingUtilities.invokeLater(new Runnable(){
public void run() {
grpAnimal.clearSelection();
if (CAT.equals(evt.getActionCommand())) {
grpAnimal.setSelected(radCat.getModel(), true);
}
else if (DOG.equals(evt.getActionCommand())) {
grpAnimal.setSelected(radDog.getModel(), true);
}
}
});
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("RadioButtonExample");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
JComponent newContentPane = new RadioButtonExample();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
// Comment out the line below to run using standard L&F
setLookAndFeel();
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
private static void setLookAndFeel() {
try {
// Set Windows L&F
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
}
catch (Exception e) {
// handle exception
}
}
}
有沒有辦法阻止這種行為,甚至可以加快它的速度,使其對我們的用戶不那么明顯?
您可以通過指定swing.disablevistaanimation
Java 系統屬性來禁用動畫:
java -Dswing.disablevistaanimation="true" your-cool-application.jar
在com.sun.java.swing.plaf.windows.AnimationController
類中,有一個VISTA_ANIMATION_DISABLED
字段被初始化為swing.disablevistaanimation
屬性。 該字段確定是否paintSkin
方法調用skin.paintSkinRaw
如果動畫被禁用,否則開始進入動畫方法。
它適用於我的帶有 Java 8 (jdk1.8.0_65) 的 Windows 8.1 筆記本電腦,因此它的效果似乎不僅限於 Windows Vista。
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