问题描述
我一直在验证一个在 mac osx 的小程序上运行的 swing 应用程序.
I've been validating a swing application that runs on an applet for mac osx.
在此验证过程中，我发现模式对话框存在以下问题:
During this validation I found the following issues with the modal dialogs:
- 当对话框打开并且设置为 setModal(true) 时，它会阻止根窗口的内容，但是如果您单击根窗口上的某个位置，对话框会在它下方，但它应该保留在根窗口的顶部.
- 如果对话框有 JTextInputField，即使单击它也不会获得焦点.
所以我创建了一个小程序来显示问题.你能帮我理解这里有什么问题吗?
So I created a small program to show the problem. Can you please help me to understand what is wrong here?
package com.macosx.tests;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class DialogExample extends JApplet{
private static final long serialVersionUID = 1L;
private JPanel panel;
private JButton openDialogBtn;
private void doStart() {
panel = new JPanel();
panel.setPreferredSize(new Dimension(500,500));
openDialogBtn = new JButton("open dialog");
openDialogBtn.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent arg0) {
ModalDialog dialog = new ModalDialog(panel, true);
dialog.setVisible(true);
}
});
panel.add(openDialogBtn);
setContentPane(panel);
}
class ModalDialog extends JDialog {
private static final long serialVersionUID = 1L;
public ModalDialog(Component parent, boolean modal) {
Dimension dimensionParentFrame = parent.getSize();
setSize(new Dimension((parent == null) ? 300 : dimensionParentFrame.width / 2, 75));
setModal(modal);
setModalityType(ModalityType.APPLICATION_MODAL);
JTextField txtField = new JTextField();
add(txtField, BorderLayout.CENTER);
}
}
@Override
public void start() {
try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
doStart();
}
});
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
使用上述创建一个 .jar 文件(test.jar).完成后，创建一个包含以下内容的 html 文件:
Use the above to create a .jar file (test.jar). Once that is done, create a html file with the following content:
<html>
<head>
<title>Dialog test Applet</title>
</head>
<body>
<applet id="DialogTestApplet" height="800" width="600"
code="com.macosx.tests.DialogExample"
archive="test.jar">
</applet>
</div>
</body>
</html>
完成后，运行 html 文件.您将看到一个带有灰色背景和一个按钮的小程序.然后尝试:
When this is done, run the html file. You'll see an applet with a gray background and with a button. Then try to:
- 点击按钮打开对话框.之后，单击灰色区域的某处:对话框位于浏览器窗口下方，但它应该保留在顶部，对吧?
- 点击按钮打开对话框.之后单击对话框的文本字段并尝试编写一些内容:文本对话框没有获得焦点.
那么，我在这里做错了什么?请问有mac电脑的人可以测试一下吗?
So, what am I doing wrong here? Can someone with a mac computer test this please?
谢谢
规格:
java.vendor Oracle Corporation
java.version 1.7.0_07
os.name Mac OS X
os.version 10.7.4
browser firefox 15
注意:请注意，这仅在小程序在浏览器上运行且仅在 mac osx 上运行时才会发生.
推荐答案
我找到了另一种解决方法.当窗口打开时，显示一个选项窗格几毫秒然后关闭它.它将焦点放在选项窗格上，然后返回对话框，允许忽略该错误.
I found another workaround. When the window is opened, show an optionpane for a few milliseconds and close it. It give the focus to the optionpane and then back to the dialog, allowing to ignore the bug.
将这段代码添加到您的对话框构造函数中，它应该可以工作:
Add this snipet of code to your dialog constructor and it should work:
addWindowListener(new WindowAdapter(){
public void windowOpened(WindowEvent e){
JOptionPane pane = new JOptionPane();
final JDialog dialog = pane.createDialog("Please Wait");
Timer timer = new Timer(50, new ActionListener() {
public void actionPerformed(ActionEvent e) {
dialog.dispose();
}
});
timer.setRepeats(false);
timer.start();
dialog.setVisible(true);
}
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