I've got a JTextArea that serves as a very basic XSLT editor. One of its functions is to allow the user to input elements via accelarators (e.g. Ctrl+Shift+t inserts a <xsl:template> element). Is it possible to display a component, such as a JLabel, at the position of the caret in the JTextArea? The intention is to populate it with information about what letter inserts what element)
I would consider a JPopupMenu, a JDialog, a JWindow or possibly an overlay approach such as a glass pane or a non–opaque JPanel added above the JTextArea with an OverlayLayout as options. The last two options have some extra overhead regarding event routing, especially the glass pane. But they can give an elegant affect. You can use the JComponent method modelToView to convert from the caret position in the document to a point on the component.