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editor_components.md

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Editor Components

EditorTextField

Compared to Swing JTextArea, the IntelliJ Platform's editor component has a ton of advantages: syntax highlighting support, code completion, code folding and much more. Editors are normally displayed in editor tabs, but they can be embedded in dialogs or tool windows, too. This is enabled by the EditorTextField component.

The following attributes can be specified:

  • The file type according to which the text in the text field is parsed;
  • Whether the text field is read-only or editable;
  • Whether the text field is single-line or multiline.

Further customizations are possible by subclassing and overriding createEditor().

A common use case for EditorTextField is entering the name of a Java class or package. This can be accomplished with the following steps:

  • Use JavaCodeFragmentFactory.getInstance().createReferenceCodeFragment() to create a code fragment representing the class or package name;
  • Call PsiDocumentManager.getInstance().getDocument() to get the document corresponding to the code fragment;
  • Pass the returned document to the EditorTextField constructor or its setDocument() method.

E.g.:

PsiFile psiFile = PsiDocumentManager.getInstance(editor.getProject()).getPsiFile(editor.getDocument());
PsiElement element = psiFile.findElementAt(editor.getCaretModel().getOffset());

PsiExpressionCodeFragment code = JavaCodeFragmentFactory.getInstance(editor.getProject())
                                   .createExpressionCodeFragment("", element, null, true);

Document document = PsiDocumentManager.getInstance(editor.getProject()).getDocument(code);

EditorTextField myInput = new EditorTextField(document, editor.getProject(), JavaFileType.INSTANCE);

TIPS:

  • When creating more than one field two separate documents are needed. This is accomplished by using separate instances of PsiExpressionCodeFragment.
  • setText() no longer works for the input field. However, createExpressionCodeFragment() accepts the text for the field as an argument. The empty string can be replaced and create a new document in lieu of setText().
  • Instances of JTextField in the GUI builder can be replaced with a custom replacement component using the right click in your IDE. Make sure to use "Custom Create", so the initialization code works properly.