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Topic: Re: Spider Monkey Panel (foo_spider_monkey_panel) (Read 810 times) previous topic - next topic - Topic derived from Re: Spider Monkey Pan...
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Re: Spider Monkey Panel (foo_spider_monkey_panel)

EDIT. Sorry, this is not supposed to be in its own thread. I only get two posting options. Quick Reply (which I don't want) or New Post. 


Can anyone help? I'm trying to convert some code from JScript to Spider Monkey and this one is giving me a headache..
Code: [Select]
String.prototype.calc_width = function (font_str) {
	var font = JSON.parse(font_str);
	return utils.CalcTextWidth(this, font.Name, font.Size, font.Weight || 400);
}

It gives me... CalcTextWidth failed:  Value is not a JS object

It's not contained in a function. In fact, it's the first lines in the code.

So I changed it to this and I get the same error...

Code: [Select]
let _bmp = gdi.CreateImage(1, 1);
let _gr = _bmp.GetGraphics();

String.prototype.calc_width = function (font) {
	return _gr.CalcTextWidth(this, font);
}

Re: Spider Monkey Panel (foo_spider_monkey_panel)

Reply #1 –
This works...

Code: [Select]
let _bmp = gdi.CreateImage(1, 1);
let _gr = _bmp.GetGraphics();

String.prototype.calc_width = function (font) {
	return _gr.CalcTextWidth(this, font);
}

var font = gdi.Font("Segoe UI", 16); // or could be window.GetFontCUI / window.GetFontDUI
var width = "XXXX".calc_width(font);
console.log(width);