Read only mode for document

Could you clarify, why do you need read-only Document?

If you need it to show read-only Editor, you can use EditorFactory.createViewer() instead of EditorFactory.createEditor().

If this document should be modified exclusively by some specific code, you can temporally make it writable there (document.setReadOnly(false); document.setText("New content"); document.setReadOnly(false) ).

Thank you. Now i'll use EditorFactory.createViewer().

Hey is there anything for DiffContentFactory that is editable and not editable,like this EditorFactory.createEditor(Document,Project,FileType,isViewer)

I'm not sure if I got your question right, but you might want to pass DiffUserDataKeys.FORCE_READ_ONLY or DiffUserDataKeys.FORCE_READ_ONLY_CONTENTS key to the request.

Example: https://github.com/JetBrains/intellij-community/blob/master/platform/diff-impl/src/com/intellij/diff/actions/CompareClipboardWithSelectionAction.java#L97

Does an editor created with createViewer() support carets? I have a situation (REPL output) where I would like to be able to allow the user to have a caret in a read-only document so that they can copy text from it. Is this possible?

Yes. This is regular Editor with disabled editing actions.

Hey Aleksey, You got my question correct like i need for editor and DocumentContent both. for editor i found

createEditor(@NotNull Document document, Project project, @NotNull VirtualFile file, boolean isViewer);

but i didn't find anything for DocumentContent in which option should be there for editing. 

and  DiffUserDataKeys.FORCE_READ_ONLY_CONTENTS it makes read only to content2 only not content 1.
i want to make read only to both of them n either editable to both of them. 

I can't reproduce the issue, could you attach sample code snippet ?

Note, that in the example above "makes read only to content2 only not content 1" is a desired behaviour. You need FORCE_READ_ONLY to mark all contents as read only (or pass {true, true} for two-content case).