Scripting 1-line vs 2-line text boxes

Question

I will try to ask this question as best I can, but the problem is a challenging one.

I have a text box that one part of my script will change the text in. I want to code a boolean variable to check if that text fits on one line or not.

Ex.

 ___________________
|This returns true  |
|                   |
|___________________|

but

 ___________________
|This longer version|
|returns false      |
|___________________|

Character count won't work since I'm not using a monospaced font. Any ideas?

Answer 1

The best I could come up with was this:

After new text is applied...

1. Check layer height
2. Turn on "No Break"
3. Remove all "\r"
4. Check layer height again
   • If layer height is now less than it was before = multiline
   • ^{_{Because if the text is already in a single line, step 2. and step 3. wouldn't affect the height.}}
5. Rollback the history state if necessary.

---

var doc = app.activeDocument;
var layer = doc.activeLayer;

var historyRollback = doc.activeHistoryState;
var rulerUnits = app.preferences.rulerUnits;
app.preferences.rulerUnits = Units.POINTS;

var height1 = size( layer )[1];
layer.textItem.noBreak = true;
layer.textItem.contents = layer.textItem.contents.replace(/\r/g,'');
var height2 = size( layer )[1];

var singleline = height1 > height2 ? false : true;

app.preferences.rulerUnits = rulerUnits;
doc.activeHistoryState = historyRollback;
doc.activeLayer = layer;

alert( singleline )

function size( layer ) {

    var bounds = layer.boundsNoEffects;
    var top = bounds[1].value;
    var right = bounds[2].value;
    var bottom = bounds[3].value;
    var left = bounds[0].value;
    var width = right - left;
    var height = bottom - top;

    return [ width, height ];

}