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Selecting Inline Elements in JTextPane

A JTextPane

allows embedding JComponents

and images . When you select a section of the document, the text is highlighted but inline elements are not. You can add inline components through CaretListener

after the event, but I was wondering if there is a way to highlight them during mouse selection?

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3 answers


Set the user Highlighter

in JTextPane

, which can inform the embedded components, they should be allocated or not:



textPane.setHighlighter( new CustomHighlighter() );

// ...

private final class CustomHighlighter extends DefaultHighlighter {

    @Override
    public Object addHighlight( int p0, int p1, HighlightPainter p ) throws BadLocationException {
       Object tag = super.addHighlight(p0, p1, p);
       /* notify embedded components ... */ 
       return tag;
    }

    @Override
    public void removeHighlight( Object tag ) {
        super.removeHighlight(tag);
       /* notify embedded components ... */ 
    }

    @Override
    public void removeAllHighlights() { 
        super.removeAllHighlights();
       /* notify embedded components ... */ 
    }

    @Override
    public void changeHighlight( Object tag, int p0, int p1 ) throws BadLocationException {
       super.changeHighlight(tag, p0, p1);
       /* notify embedded components ... */ 
    }
}
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You can use MouseMotionListener and handle mouseDragged event. Then you will need to use the viewToModel () method to find out which part of the model has been selected.



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Ok, I did something similar, a long time ago. In my cases, the built-in components were emoticons in the chat editor. What you do is that when a selection happens, you get a label and a dot (e.getMark, e.getDot). If the emoji lies between the label and point, then it must be highlighted, so you set a field in the emoji component to indicate highlight and send a redraw request. Finally, in the paint (g) method of the emoticon component, you simply paint it as selection.

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