CODEWITHSUNDEEP
javaswtstyledtext
thinkereer
thinkereer

Reputation: 117

Java SWT overlapping/multiple StyleRanges

I'm using a StyledText in my project, in it I have lots of texts that can have different styles depending on some events, sometimes these styles can overlap, so a style that represents a yellow background color can be set for an area that already has a styleRange of a red foreground color.

Here's an example in code that's not representative of the closed source project:

        text_1 = new StyledText(composite, SWT.BORDER);
        text_1.setBounds(10, 10, 320, 21);
        text_1.setText("1234567890abcdefghij");
        text_1.setStyleRange(new StyleRange(0, 9, Display.getDefault().getSystemColor(SWT.COLOR_RED), null));
        text_1.setStyleRange(new StyleRange(2, 9, null,  Display.getDefault().getSystemColor(SWT.COLOR_YELLOW)));
        text_1.setSelection(3, 7);

The first style from 0-9 is to have a red foreground color, the second for 2-9 is to have a yellow background, what I get is that only 0-1 will have a red foreground color, while 2-9 will have black foreground color with yellow background, when what I want is 2-9 to have both a red foreground and a yellow background.

Result:

How it really looks

What I want it to look like:

How it should be

My question, how can I make it so that setting a new styleRange doesn't erase the old style range or at least copies previous characteristics in case one was null?

Thank you.

Upvotes: 1

Views: 366

Answers (2)

greg-449
greg-449

Reputation: 111142

Style ranges can't overlap. You will have to write code to combine the ranges where they overlap to achieve what you want.

If you can use JFace the TextPresentation class can merge overlapping ranges. You can use this on its own and in combination with the TextViewer or SourceViewer classes.

Upvotes: 4

Baz
Baz

Reputation: 36884

The JavaDoc of setStyleRange() pretty much says it all:

The new style overwrites existing styles for the specified range. Existing style ranges are adjusted if they partially overlap with the new style

This means that you'll have to define each part individually:

  • Red text, white background
  • Red text, yellow background

Upvotes: 4

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