Question

我编写了一个调用RSyntaxTextArea并自动完成的代码。当用户输入功能时，该单词将替换为功能＆lt;＆gt;。我想在下面的代码中突出显示“label”这个词，以便用户知道他们必须输入一个名字。

provider.addCompletion(new ShorthandCompletion(provider, "function", "function<Label>","function<Label>"));

代码基本上用函数替换函数并移动而不是突出显示标签并等待用户输入内容。我怎么能这样做？

Answer 1

您可以使用TemplateCompletion课程代替ShorthandCompletion。不幸的是，这似乎对我不起作用（在AutoCompleteDemo示例中尝试过）。

替代方法是使用CodeTemplateManager并扩展CodeTemplate。以下是一个示例（来自CodeTemplateDemo）。

首先展开AbstractCodeTemplate：

import java.io.IOException;
import java.io.ObjectInputStream;
import javax.swing.text.BadLocationException;
import javax.swing.text.Caret;
import javax.swing.text.Element;

import org.fife.ui.rsyntaxtextarea.RSyntaxDocument;
import org.fife.ui.rsyntaxtextarea.RSyntaxTextArea;
import org.fife.ui.rsyntaxtextarea.RSyntaxUtilities;

import org.fife.ui.rsyntaxtextarea.templates.*;

public class ArtemisCodeTemplate extends StaticCodeTemplate {

    private static final long serialVersionUID = 1;

    /**
     * The code inserted before the caret position.
     */
    private String beforeCaret;

    /**
     * The code inserted after the caret position.
     */
    private String afterCaret;

    /**
     * Cached value representing whether <code>beforeCaret</code> contains
     * one or more newlines.
     */
    private transient int firstBeforeNewline;

    /**
     * Cached value representing whether <code>afterCaret</code> contains
     * one or more newlines.
     */
    private transient int firstAfterNewline;

    private static final String EMPTY_STRING        = "";

    /**
    * Placeholder for the selected keyword
    */
    private String placeholder;

    /**
     * Constructor.  This constructor only exists to support persistance
     * through serialization.
     */
    public ArtemisCodeTemplate() {
    }


    /**
     * Constructor.
     *
     * @param id The ID of this code template.
     * @param beforeCaret The text to place before the caret.
     * @param afterCaret The text to place after the caret.
     */
    public ArtemisCodeTemplate(String id, String beforeCaret, String placeholder, String afterCaret){
        super(id, beforeCaret, afterCaret);
        setPlaceholder(placeholder);
    }

    public String getPlaceholder() {
        return placeholder;
    }

    public void setPlaceholder(String text) {
        this.placeholder = text;
    }

    private String getAfterTextIndented(String indent) {
        return getTextIndented(getAfterCaretText(), firstAfterNewline, indent);
    }

    private String getBeforeTextIndented(String indent) {
        return getTextIndented(getBeforeCaretText(),firstBeforeNewline,indent);
    }

    private String getTextIndented(String text,int firstNewline,String indent) {
        if (firstNewline==-1) {
            return text;
        }
        int pos = 0;
        int old = firstNewline+1;
        StringBuffer sb = new StringBuffer(text.substring(0, old));
        sb.append(indent);
        while ((pos=text.indexOf('\n', old))>-1) {
            sb.append(text.substring(old, pos+1));
            sb.append(indent);
            old = pos+1;
        }
        if (old<text.length()) {
            sb.append(text.substring(old));
        }
        return sb.toString();
    }

    public void invoke(RSyntaxTextArea textArea) throws BadLocationException {

        Caret c = textArea.getCaret();
        int dot = c.getDot();
        int mark = c.getMark();
        int p0 = Math.min(dot, mark);
        int p1 = Math.max(dot, mark);
        RSyntaxDocument doc = (RSyntaxDocument)textArea.getDocument();
        Element map = doc.getDefaultRootElement();

        int lineNum = map.getElementIndex(dot);
        Element line = map.getElement(lineNum);
        int start = line.getStartOffset();
        int end = line.getEndOffset()-1; // Why always "-1"?
        String s = textArea.getText(start,end-start);
        int len = s.length();

        // endWS is the end of the leading whitespace
        // of the current line.
        int endWS = 0;
        while (endWS<len && RSyntaxUtilities.isWhitespace(s.charAt(endWS))) {
            endWS++;
        }
        s = s.substring(0, endWS);
        p0 -= getID().length();
        String beforeText = getBeforeTextIndented(s);
        String afterText = getAfterTextIndented(s);
        doc.replace(p0,p1-p0, beforeText+ placeholder + afterText, null);
        textArea.setCaretPosition(p0+beforeText.length());
        textArea.moveCaretPosition(p0+beforeText.length() + placeholder.length());
    }

    private void readObject(ObjectInputStream in) throws ClassNotFoundException,
                                                IOException  {
            in.defaultReadObject();
            // "Resetting" before and after text to the same values will replace
            // nulls with empty srings, and set transient "first*Newline" values.
            setBeforeCaretText(this.beforeCaret);
            setAfterCaretText(this.afterCaret);
        }

    /**
     * Returns a string representation of this template for debugging
     * purposes.
     *
     * @return A string representation of this template.
     */
    public String toString() {
        return "[ArtemisCodeTemplate: id=" + getID() +
            ", text=" + getBeforeCaretText() + "|" +
                 getPlaceholder() + "|" + getAfterCaretText() + "]";
    }


}

然后将其添加到CodeTemplateManager：

  RSyntaxTextArea.setTemplatesEnabled(true);
  CodeTemplateManager ctm = RSyntaxTextArea.getCodeTemplateManager();
  CodeTemplate ct = new ArtemisCodeTemplate("sout", "System.out.println(", "<replaceme>", ");");
  ctm.addTemplate(ct);

如果您输入“sout”并点击ctrl + shift + space，它将会扩展为System.out.println(<replaceme>);，并且会选择<replaceme>部分，以便您可以输入它。

在RSyntaxTextArea中突出显示ShorthandCompletion的一部分

1 个答案: