CODEWITHSUNDEEP
javaswingcolorshighlight
swag antiswag
swag antiswag

Reputation: 359

How to change the color of text between two positions?

I want to change the color of my text for my Swing app (JTextPane) from two points, when highlighted. If the user highlights a phrase from, say, index 4 to 9, then only those characters will change their colors, permanently. I say permanently because I already know there is a setSelectionColor() option, but that is only temporary. I have managed to get the starting and ending points of the highlighted text, but I've reached a dead end.

Here is what I have so far:

StyleContext sc = StyleContext.getDefaultStyleContext();
AttributeSet attributes = sc.addAttribute(SimpleAttributeSet.EMPTY, StyleConstants.Foreground, color);

    if(tp.getSelectedText() != null){//tp is a jtextpane. text is highlighted. change highlighted text color
        int start = tp.getSelectionStart();
        int end = tp.getSelectionEnd();
        //update the color of the text within start and end
    }
tp.setCharacterAttributes(attributes, false);//update the color for the new text

Upvotes: 0

Views: 207

Answers (1)

camickr
camickr

Reputation: 324127

I have managed to get the starting and ending points of the highlighted text,

You can set the attributes of the text with something like:

//  Define a keyword attribute

SimpleAttributeSet keyWord = new SimpleAttributeSet();
StyleConstants.setForeground(keyWord, Color.RED);
StyleConstants.setBackground(keyWord, Color.YELLOW);
StyleConstants.setUnderline(keyWord, Boolean.TRUE );
StyleConstants.setBold(keyWord, true);

//  Change attributes on some text

StyledDocument doc = textPane.getStyledDocument();
doc.setCharacterAttributes(start, end - start, keyWord, false);

You can also use a StyledEditorKit Action to stylize text (bold, italic, color...). Read the section from the Swing tutorial on Text Component Features for more information and working examples.

Upvotes: 4

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