如何在 JEditorPane 中设置选项卡大小？

发布于 2024-07-17 17:24:56 字数 306 浏览 7 评论 0原文

JTextArea 的选项卡大小可以使用 setTabSize(int) 轻松设置。

是否有类似的方法可以使用 JEditorPane 来完成此操作？

现在，我的窗格中带有选项卡的文本如下所示：

if (stuff){
            more stuff;
}

而且，我更喜欢更小的制表位：

if (stuff){
    more stuff;
}

原文

A JTextArea's tab size can easily be set using setTabSize(int).

Is there a similar way to do it with a JEditorPane?

Right now, text with tabs in my pane looks like:

if (stuff){
            more stuff;
}

And, I'd prefer a much smaller tab stop:

if (stuff){
    more stuff;
}

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妞丶爷亲个 2024-07-24 17:24:56

由于 JEditorPane 旨在支持不同类型的内容类型，因此它不提供直接指定“选项卡大小”的方法，因为其含义应由内容模型定义。
但是，当您使用 PlainDocument 或其后代之一的模型时，有一个“tabSizeAttribute”可以提供您正在寻找的内容。

示例：

JEditorPane pane = new JEditorPane(...);
...
Document doc = pane.getDocument();
if (doc instanceof PlainDocument) {
    doc.putProperty(PlainDocument.tabSizeAttribute, 8);
}
...

来自 Javadoc：

/**
 * Name of the attribute that specifies the tab
 * size for tabs contained in the content.  The
 * type for the value is Integer.
 */
public static final String tabSizeAttribute = "tabSize";

As JEditorPane is designed to support different kinds of content types, it does not provide a way to specify a "tab size" directly, because the meaning of that should be defined by the content model.
However when you use a model that's a PlainDocument or one of its descendants, there is a "tabSizeAttribute" that provides what you are looking for.

Example:

JEditorPane pane = new JEditorPane(...);
...
Document doc = pane.getDocument();
if (doc instanceof PlainDocument) {
    doc.putProperty(PlainDocument.tabSizeAttribute, 8);
}
...

From the Javadoc:

/**
 * Name of the attribute that specifies the tab
 * size for tabs contained in the content.  The
 * type for the value is Integer.
 */
public static final String tabSizeAttribute = "tabSize";

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森林迷了鹿 2024-07-24 17:24:56

如果有人使用 StyledDocument （另一个答案上的链接已失效），

您可以创建一个 TabSet，它是 TabStop 的数组。就我而言，我只关心第一个选项卡，并且我希望它距离左侧 20px，所以这段代码对我有用：

StyleContext sc = StyleContext.getDefaultStyleContext();
TabSet tabs = new TabSet(new TabStop[] { new TabStop(20) });
AttributeSet paraSet = sc.addAttribute(SimpleAttributeSet.EMPTY, StyleConstants.TabSet, tabs);
pane.setParagraphAttributes(paraSet, false);

In case anyone's using a StyledDocument (The link on the other answer died)

You create a TabSet which is an array of TabStops. In my case I only cared about the 1st tab, and I wanted it 20px from the left, so this code worked for me:

StyleContext sc = StyleContext.getDefaultStyleContext();
TabSet tabs = new TabSet(new TabStop[] { new TabStop(20) });
AttributeSet paraSet = sc.addAttribute(SimpleAttributeSet.EMPTY, StyleConstants.TabSet, tabs);
pane.setParagraphAttributes(paraSet, false);

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