255 lines
10 KiB
JavaScript
255 lines
10 KiB
JavaScript
/*
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* Tabby jQuery plugin version 0.12
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*
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* Ted Devito - http://teddevito.com/demos/textarea.html
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*
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* You should have received a copy of the GNU General Public License
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* along with Easy Widgets. If not, see <http://www.gnu.org/licenses/>
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*
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* Plugin development pattern based on: http://www.learningjquery.com/2007/10/a-plugin-development-pattern
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*
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*/
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// create closure
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(function($) {
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// plugin definition
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$.fn.tabby = function(options) {
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//debug(this);
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// build main options before element iteration
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var opts = $.extend({}, $.fn.tabby.defaults, options);
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var pressed = $.fn.tabby.pressed;
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// iterate and reformat each matched element
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return this.each(function() {
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$this = $(this);
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// build element specific options
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var options = $.meta ? $.extend({}, opts, $this.data()) : opts;
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$this.bind('keydown',function (e) {
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var kc = $.fn.tabby.catch_kc(e);
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if (16 == kc) pressed.shft = true;
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/*
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because both CTRL+TAB and ALT+TAB default to an event (changing tab/window) that
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will prevent js from capturing the keyup event, we'll set a timer on releasing them.
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*/
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if (17 == kc) {pressed.ctrl = true; setTimeout("$.fn.tabby.pressed.ctrl = false;",1000);}
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if (18 == kc) {pressed.alt = true; setTimeout("$.fn.tabby.pressed.alt = false;",1000);}
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if (9 == kc && !pressed.ctrl && !pressed.alt) {
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e.preventDefault; // does not work in O9.63 ??
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pressed.last = kc; setTimeout("$.fn.tabby.pressed.last = null;",0);
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process_keypress ($(e.target).get(0), pressed.shft, options);
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return false;
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}
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}).bind('keyup',function (e) {
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if (16 == $.fn.tabby.catch_kc(e)) pressed.shft = false;
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}).bind('blur',function (e) { // workaround for Opera -- http://www.webdeveloper.com/forum/showthread.php?p=806588
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if (9 == pressed.last) $(e.target).one('focus',function (e) {pressed.last = null;}).get(0).focus();
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});
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});
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};
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// define and expose any extra methods
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$.fn.tabby.catch_kc = function(e) { return e.keyCode ? e.keyCode : e.charCode ? e.charCode : e.which; };
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$.fn.tabby.pressed = {shft : false, ctrl : false, alt : false, last: null};
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// private function for debugging
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function debug($obj) {
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if (window.console && window.console.log)
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window.console.log('textarea count: ' + $obj.size());
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};
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function process_keypress (o,shft,options) {
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var scrollTo = o.scrollTop;
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//var tabString = String.fromCharCode(9);
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// gecko; o.setSelectionRange is only available when the text box has focus
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if (o.setSelectionRange) gecko_tab (o, shft, options);
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// ie; document.selection is always available
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else if (document.selection) ie_tab (o, shft, options);
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o.scrollTop = scrollTo;
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}
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// plugin defaults
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$.fn.tabby.defaults = {tabString : String.fromCharCode(9)};
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function gecko_tab (o, shft, options) {
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var ss = o.selectionStart;
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var es = o.selectionEnd;
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// when there's no selection and we're just working with the caret, we'll add/remove the tabs at the caret, providing more control
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if(ss == es) {
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// SHIFT+TAB
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if (shft) {
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// check to the left of the caret first
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if ("\t" == o.value.substring(ss-options.tabString.length, ss)) {
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o.value = o.value.substring(0, ss-options.tabString.length) + o.value.substring(ss); // put it back together omitting one character to the left
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o.focus();
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o.setSelectionRange(ss - options.tabString.length, ss - options.tabString.length);
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}
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// then check to the right of the caret
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else if ("\t" == o.value.substring(ss, ss + options.tabString.length)) {
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o.value = o.value.substring(0, ss) + o.value.substring(ss + options.tabString.length); // put it back together omitting one character to the right
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o.focus();
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o.setSelectionRange(ss,ss);
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}
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}
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// TAB
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else {
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o.value = o.value.substring(0, ss) + options.tabString + o.value.substring(ss);
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o.focus();
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o.setSelectionRange(ss + options.tabString.length, ss + options.tabString.length);
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}
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}
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// selections will always add/remove tabs from the start of the line
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else {
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// split the textarea up into lines and figure out which lines are included in the selection
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var lines = o.value.split("\n");
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var indices = new Array();
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var sl = 0; // start of the line
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var el = 0; // end of the line
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var sel = false;
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for (var i in lines) {
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el = sl + lines[i].length;
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indices.push({start: sl, end: el, selected: (sl <= ss && el > ss) || (el >= es && sl < es) || (sl > ss && el < es)});
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sl = el + 1;// for "\n"
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}
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// walk through the array of lines (indices) and add tabs where appropriate
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var modifier = 0;
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for (var i in indices) {
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if (indices[i].selected) {
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var pos = indices[i].start + modifier; // adjust for tabs already inserted/removed
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// SHIFT+TAB
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if (shft && options.tabString == o.value.substring(pos,pos+options.tabString.length)) { // only SHIFT+TAB if there's a tab at the start of the line
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o.value = o.value.substring(0,pos) + o.value.substring(pos + options.tabString.length); // omit the tabstring to the right
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modifier -= options.tabString.length;
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}
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// TAB
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else if (!shft) {
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o.value = o.value.substring(0,pos) + options.tabString + o.value.substring(pos); // insert the tabstring
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modifier += options.tabString.length;
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}
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}
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}
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o.focus();
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var ns = ss + ((modifier > 0) ? options.tabString.length : (modifier < 0) ? -options.tabString.length : 0);
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var ne = es + modifier;
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o.setSelectionRange(ns,ne);
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}
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}
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function ie_tab (o, shft, options) {
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var range = document.selection.createRange();
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if (o == range.parentElement()) {
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// when there's no selection and we're just working with the caret, we'll add/remove the tabs at the caret, providing more control
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if ('' == range.text) {
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// SHIFT+TAB
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if (shft) {
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var bookmark = range.getBookmark();
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//first try to the left by moving opening up our empty range to the left
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range.moveStart('character', -options.tabString.length);
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if (options.tabString == range.text) {
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range.text = '';
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} else {
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// if that didn't work then reset the range and try opening it to the right
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range.moveToBookmark(bookmark);
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range.moveEnd('character', options.tabString.length);
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if (options.tabString == range.text)
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range.text = '';
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}
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// move the pointer to the start of them empty range and select it
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range.collapse(true);
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range.select();
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}
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else {
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// very simple here. just insert the tab into the range and put the pointer at the end
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range.text = options.tabString;
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range.collapse(false);
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range.select();
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}
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}
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// selections will always add/remove tabs from the start of the line
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else {
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var selection_text = range.text;
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var selection_len = selection_text.length;
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var selection_arr = selection_text.split("\r\n");
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var before_range = document.body.createTextRange();
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before_range.moveToElementText(o);
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before_range.setEndPoint("EndToStart", range);
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var before_text = before_range.text;
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var before_arr = before_text.split("\r\n");
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var before_len = before_text.length; // - before_arr.length + 1;
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var after_range = document.body.createTextRange();
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after_range.moveToElementText(o);
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after_range.setEndPoint("StartToEnd", range);
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var after_text = after_range.text; // we can accurately calculate distance to the end because we're not worried about MSIE trimming a \r\n
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var end_range = document.body.createTextRange();
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end_range.moveToElementText(o);
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end_range.setEndPoint("StartToEnd", before_range);
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var end_text = end_range.text; // we can accurately calculate distance to the end because we're not worried about MSIE trimming a \r\n
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var check_html = $(o).html();
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$("#r3").text(before_len + " + " + selection_len + " + " + after_text.length + " = " + check_html.length);
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if((before_len + end_text.length) < check_html.length) {
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before_arr.push("");
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before_len += 2; // for the \r\n that was trimmed
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if (shft && options.tabString == selection_arr[0].substring(0,options.tabString.length))
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selection_arr[0] = selection_arr[0].substring(options.tabString.length);
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else if (!shft) selection_arr[0] = options.tabString + selection_arr[0];
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} else {
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if (shft && options.tabString == before_arr[before_arr.length-1].substring(0,options.tabString.length))
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before_arr[before_arr.length-1] = before_arr[before_arr.length-1].substring(options.tabString.length);
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else if (!shft) before_arr[before_arr.length-1] = options.tabString + before_arr[before_arr.length-1];
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}
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for (var i = 1; i < selection_arr.length; i++) {
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if (shft && options.tabString == selection_arr[i].substring(0,options.tabString.length))
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selection_arr[i] = selection_arr[i].substring(options.tabString.length);
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else if (!shft) selection_arr[i] = options.tabString + selection_arr[i];
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}
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if (1 == before_arr.length && 0 == before_len) {
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if (shft && options.tabString == selection_arr[0].substring(0,options.tabString.length))
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selection_arr[0] = selection_arr[0].substring(options.tabString.length);
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else if (!shft) selection_arr[0] = options.tabString + selection_arr[0];
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}
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if ((before_len + selection_len + after_text.length) < check_html.length) {
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selection_arr.push("");
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selection_len += 2; // for the \r\n that was trimmed
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}
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before_range.text = before_arr.join("\r\n");
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range.text = selection_arr.join("\r\n");
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var new_range = document.body.createTextRange();
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new_range.moveToElementText(o);
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if (0 < before_len) new_range.setEndPoint("StartToEnd", before_range);
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else new_range.setEndPoint("StartToStart", before_range);
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new_range.setEndPoint("EndToEnd", range);
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new_range.select();
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}
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}
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}
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// end of closure
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})(jQuery);
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