[英]Java Swing JTextPane text/html not honoring disabled attribute
I am trying to display a simple HTML page in a JTextPane.我正在尝试在 JTextPane 中显示一个简单的 HTML 页面。 The page has input checkbox/radio elements but they need to be disabled.
该页面具有输入复选框/单选元素,但需要禁用它们。 However, when the page is displayed, the checkbox and radio buttons are still enabled.
但是,当页面显示时,复选框和单选按钮仍处于启用状态。 I don't want the user to be able to click and change their state.
我不希望用户能够点击并改变他们的状态。 Is this a bug or I am doing something wrong.
这是一个错误还是我做错了什么。 Please help.
请帮忙。 Here is sample code:
这是示例代码:
import javax.swing.*;
public class JEPTest {
public static void main(String[] args) throws Exception{
String data = "<html>\n" +
"\n" +
"<body>\n" +
"<input type='radio' disabled>\n" +
"\n" +
"</body>\n" +
"</html>";
final JEditorPane textPane = new JEditorPane();
textPane.setContentType("text/html");
textPane.setEnabled(false);
JScrollPane paneScrollPane = new JScrollPane(textPane);
paneScrollPane.setVerticalScrollBarPolicy(
JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
paneScrollPane.setHorizontalScrollBarPolicy(
JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
//paneScrollPane.setPreferredSize(new Dimension(250, 155));
paneScrollPane.setMinimumSize(new Dimension(100, 100));
JButton jb = new JButton("set");
jb.addActionListener
(
new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
textPane.setText(data);
}
}
);
JFrame jf = new JFrame();
jf.setSize(800, 600);
jf.getContentPane().add(textPane, BorderLayout.CENTER);
jf.getContentPane().add(jb, BorderLayout.SOUTH);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setVisible(true);
}
}
Swing uses an old HTML rendering engine which only supports HTML 3.2. Swing 使用仅支持 HTML 3.2 的旧 HTML 渲染引擎。 The HTML 3.2 specification reveals that the
<input>
element did not allow for a disabled
attribute at the time of that version. HTML 3.2 规范显示
<input>
元素在该版本时不允许使用disabled
属性。 The defined attributes were:定义的属性是:
<!ATTLIST INPUT
type %InputType TEXT -- what kind of widget is needed --
name CDATA #IMPLIED -- required for all but submit and reset --
value CDATA #IMPLIED -- required for radio and checkboxes --
checked (checked) #IMPLIED -- for radio buttons and check boxes --
size CDATA #IMPLIED -- specific to each type of field --
maxlength NUMBER #IMPLIED
src %URL #IMPLIED -- for fields with background images --
align %IAlign #IMPLIED -- vertical or horizontal alignment --
>
The best workaround is to avoid using JEditorPane and just create a JCheckBox instance in a JPanel.最好的解决方法是避免使用 JEditorPane 而只是在 JPanel 中创建一个 JCheckBox 实例。
Alternatively, you can embed any visual Java bean, including all JComponent descendants, in a JEditorPane's HTML document, using an <object>
element.或者,您可以使用
<object>
元素在 JEditorPane 的 HTML 文档中嵌入任何可视 Java bean,包括所有 JComponent 后代。 This is described in the javax.swing.text.html.ObjectView documentation.这在javax.swing.text.html.ObjectView文档中有所描述。
You can use this capability to embed a JRadioButton directly.您可以使用此功能直接嵌入 JRadioButton。 However, only String properties can be set this way, so you will have to create your own subclass of JRadioButton and add a String property which wraps the
enabled
property:但是,只能以这种方式设置 String 属性,因此您必须创建自己的 JRadioButton 子类并添加一个 String 属性来包装
enabled
属性:
public class JEPTest {
public static class StringPropRadioButton
extends JRadioButton {
private static final long serialVersionUID = 1;
public String getEnabledAsString() {
return String.valueOf(isEnabled());
}
public void setEnabledAsString(String enabled) {
setEnabled(Boolean.parseBoolean(enabled));
}
}
public static void main(String[] args) throws Exception{
String data = "<html>\n" +
"\n" +
"<body>\n" +
"<input type='radio' disabled>\n" +
"\n" +
"<p>" +
"<object classid='JEPTest$StringPropRadioButton' id='option1'>" +
" <param name='text' value='Option 1'>" +
" <param name='enabledAsString' value='false'>" +
"</object>" +
"</body>\n" +
"</html>";
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