113 rader
4,2 KiB
JavaScript
113 rader
4,2 KiB
JavaScript
define("dijit/_BidiSupport", ["./_WidgetBase"], function(_WidgetBase){
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// module:
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// dijit/_BidiSupport
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/*=====
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return function(){
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// summary:
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// Module that deals with BIDI, special with the auto
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// direction if needed without changing the GUI direction.
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// Including this module will extend _WidgetBase with BIDI related methods.
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// description:
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// There's a special need for displaying BIDI text in rtl direction
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// in ltr GUI, sometimes needed auto support.
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// In creation of widget, if it's want to activate this class,
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// the widget should define the "textDir".
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};
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=====*/
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_WidgetBase.extend({
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getTextDir: function(/*String*/ text){
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// summary:
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// Gets the right direction of text.
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// description:
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// If textDir is ltr or rtl returns the value.
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// If it's auto, calls to another function that responsible
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// for checking the value, and defining the direction.
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// tags:
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// protected.
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return this.textDir == "auto" ? this._checkContextual(text) : this.textDir;
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},
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_checkContextual: function(text){
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// summary:
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// Finds the first strong (directional) character, return ltr if isLatin
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// or rtl if isBidiChar.
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// tags:
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// private.
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// look for strong (directional) characters
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var fdc = /[A-Za-z\u05d0-\u065f\u066a-\u06ef\u06fa-\u07ff\ufb1d-\ufdff\ufe70-\ufefc]/.exec(text);
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// if found return the direction that defined by the character, else return widgets dir as defult.
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return fdc ? ( fdc[0] <= 'z' ? "ltr" : "rtl" ) : this.dir ? this.dir : this.isLeftToRight() ? "ltr" : "rtl";
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},
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applyTextDir: function(/*Object*/ element, /*String*/ text){
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// summary:
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// Set element.dir according to this.textDir
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// element:
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// The text element to be set. Should have dir property.
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// text:
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// Used in case this.textDir is "auto", for calculating the right transformation
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// description:
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// If textDir is ltr or rtl returns the value.
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// If it's auto, calls to another function that responsible
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// for checking the value, and defining the direction.
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// tags:
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// protected.
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var textDir = this.textDir == "auto" ? this._checkContextual(text) : this.textDir;
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// update only when there's a difference
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if(element.dir != textDir){
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element.dir = textDir;
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}
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},
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enforceTextDirWithUcc: function(option, text){
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// summary:
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// Wraps by UCC (Unicode control characters) option's text according to this.textDir
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// option:
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// The element (`<option>`) we wrapping the text for.
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// text:
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// The text to be wrapped.
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// description:
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// There's a dir problem with some HTML elements. For some elements (e.g. `<option>`, `<select>`)
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// defining the dir in different direction then the GUI orientation, won't display correctly.
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// FF 3.6 will change the alignment of the text in option - this doesn't follow the bidi standards (static text
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// should be aligned following GUI direction). IE8 and Opera11.10 completely ignore dir setting for `<option>`.
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// Therefore the only solution is to use UCC (Unicode control characters) to display the text in correct orientation.
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// This function saves the original text value for later restoration if needed, for example if the textDir will change etc.
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if(this.textDir){
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option.originalText = text;
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var dir = this.textDir == "auto" ? this._checkContextual(text) : this.textDir;
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return (dir == "ltr" ? bidi_const.LRE : bidi_const.RLE ) + text + bidi_const.PDF;
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}
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return text;
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},
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restoreOriginalText: function(origObj){
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// summary:
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// Restores the text of origObj, if needed, after enforceTextDirWithUcc, e.g. set("textDir", textDir).
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// origObj:
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// The element (`<option>`) to restore.
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// description:
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// Sets the text of origObj to origObj.originalText, which is the original text, without the UCCs.
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// The function than removes the originalText from origObj!
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if(origObj.originalText){
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origObj.text = origObj.originalText;
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delete origObj.originalText;
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}
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return origObj;
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}
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});
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// UCC - constants that will be used by bidi support.
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var bidi_const = {
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LRM : '\u200E',
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LRE : '\u202A',
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PDF : '\u202C',
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RLM : '\u200f',
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RLE : '\u202B'
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};
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return _WidgetBase;
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});
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