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substructing a diff in caretPos to support connected languages #5

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substructing a diff in caretPos to support connected languages #5

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19 changes: 15 additions & 4 deletions textarea-helper.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@
'use strict';

var caretClass = 'textarea-helper-caret'
, endClass = 'textarea-helper-end'
, dataKey = 'textarea-helper'

// Styles that could influence size of the mirrored element.
Expand Down Expand Up @@ -32,6 +33,7 @@
, 'top' : 0
, 'left' : -9999
}).insertAfter(this.$text);
this.$mirrorfull = this.$mirror.clone().insertAfter(this.$mirror);
};

(function () {
Expand All @@ -43,19 +45,26 @@
styles[style] = this.$text.css(style);
}
this.$mirror.css(styles).empty();

this.$mirrorfull.css(styles).empty();

// Update content and insert caret.
var caretPos = this.getOriginalCaretPos()
, str = this.$text.val()
, pre = document.createTextNode(str.substring(0, caretPos))
, post = document.createTextNode(str.substring(caretPos))
, $car = $('<span/>').addClass(caretClass).css('position', 'absolute').html('&nbsp;');
this.$mirror.append(pre, $car, post)
, $car = $('<span/>').addClass(caretClass).css('position', 'absolute').html('\u0338')
, $end = $('<span/>').addClass(endClass).css('position', 'absolute').html('\u0338')
, full = document.createTextNode(str);

this.$mirror.append(pre, $car, post, $end)
.scrollTop(this.$text.scrollTop());
this.$mirrorfull.append(full, $end.clone())
.scrollTop(this.$text.scrollTop());
};

this.destroy = function () {
this.$mirror.remove();
this.$mirrorfull.remove();
this.$text.removeData(dataKey);
return null;
};
Expand All @@ -64,8 +73,9 @@
this.update();
var $caret = this.$mirror.find('.' + caretClass)
, pos = $caret.position();
var diff = this.$mirrorfull.find('.' + endClass).position().left - this.$mirror.find('.' + endClass).position().left;
if (this.$text.css('direction') === 'rtl') {
pos.right = this.$mirror.innerWidth() - pos.left - $caret.width();
pos.right = this.$mirror.innerWidth() - pos.left - $caret.width() - diff;
pos.left = 'auto';
}

Expand All @@ -75,6 +85,7 @@
this.height = function () {
this.update();
this.$mirror.css('height', '');
this.$mirrorfull.css('height', '');
return this.$mirror.height();
};

Expand Down