Changing the text area height depending on fixed text size

[sherzfel]

Hello,

I need to have an styletextarea that has an high that depends on the text, that is written in once by initialization. The text is not editable and is written once by initialization. The width is fixed und the wrapping property is set to true. How can i calculate the desired high of the styledtextarea?

Please I need urgent help, because my boss is sitting on my table.

[JordanMartinez]

I don't think anyone responded to this after you posted because they probably did not understand what your question was.

What do you mean by "a styled text area that has a high that depends on the text?" What do you mean by "high?" That's the part of your question that I do not understand.

[sherzfel]

I mean the height. I mean the number of the lines multiplicated with the style. Can you understand that?

[JordanMartinez]

You seem to be asking, "How do I set the StyledTextArea's height to change based on the font size of the area, so that (as I think this is the goal you are trying to reach) any given font size always adjusts the area's height so that at least a full x number lines are always displayed where x is the number of lines desired)?"

[sherzfel]

Yes, that I want to know. The StyledTextArea is not editable.

[JordanMartinez]

What are you using for the text style class? In other words, what is the second parameter in your area?

StyledTextArea<ParagraphStyle, TextStyle> area = //

What is TextStyle in this case?

[sherzfel]

I call the following constructor:

new StyleClassedTextArea(true).

That constructor call:

public StyleClassedTextArea(boolean preserveStyle) {
this(
new SimpleEditableStyledDocument<>(
Collections.emptyList(), Collections.emptyList()
), preserveStyle);
}

[JordanMartinez]

Ok, so you're using Collection<String> as your style object and CSS to style the area. Ideally, you'd want to create an EventStream that handles this reactively:

EventStream<Double> fontSize = // parses CSS for font size
EventStream<Double> lineSpacing = // parses CSS for line spacing
EventStream<Integer> nLines = // constructed from a Var or something else
EventStream<Tuple3<Double, Double, Integer>> lineHeight = EventStreams.combine(fontSize, lineSpacing, nLines);

lineHeight.map(tuple3 -> {
    double size = tuple3._1;
    double spacing = tuple3._2;
    int numLines = tuple3._3;

    return (size + spacing) * numLines;
}).feedTo(area.minHeightProperty());

I'm not sure how to parse the CSS manually to get the required values, but does this give you a better idea for what you need to do next?

[sherzfel]

I am using the branch with the getParagraphLinesCount method. But it doesn't work. Either the getParagraphLineCount returns the number of signs if wrap text is true or it returns 1 if wrapText is false.

[iazarny]

@sherzfel Try to

Field field = FieldUtils.getField(codeArea.getClass(), "virtualFlow", true);
VirtualFlow oldVirtualFlow = (VirtualFlow) field.get(codeArea);
flow.visibleCells().size(); // guess, this is something, that you need 

[JordanMartinez]

#501 may help with this as you don't need to use reflection to get the size of visible cells.

[Jugen]

Closed via PR 944