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Diffstat (limited to 'mod/dokuwiki/vendors/dokuwiki/lib/scripts/textselection.js')
| -rw-r--r-- | mod/dokuwiki/vendors/dokuwiki/lib/scripts/textselection.js | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/mod/dokuwiki/vendors/dokuwiki/lib/scripts/textselection.js b/mod/dokuwiki/vendors/dokuwiki/lib/scripts/textselection.js new file mode 100644 index 000000000..39dd4cc41 --- /dev/null +++ b/mod/dokuwiki/vendors/dokuwiki/lib/scripts/textselection.js @@ -0,0 +1,226 @@ +/** + * Text selection related functions. + */ + +/** + * selection prototype + * + * Object that capsulates the selection in a textarea. Returned by getSelection. + * + * @author Andreas Gohr <andi@splitbrain.org> + */ +function selection_class(){ + this.start = 0; + this.end = 0; + this.obj = null; + this.rangeCopy = null; + this.scroll = 0; + this.fix = 0; + + this.getLength = function(){ + return this.end - this.start; + }; + + this.getText = function(){ + if(!this.obj) return ''; + return this.obj.value.substring(this.start,this.end); + } +} + +/** + * Get current selection/cursor position in a given textArea + * + * @link http://groups.drupal.org/node/1210 + * @author Andreas Gohr <andi@splitbrain.org> + * @link http://linebyline.blogspot.com/2006/11/textarea-cursor-position-in-internet.html + * @returns object - a selection object + */ +function getSelection(textArea) { + var sel = new selection_class(); + + sel.obj = textArea; + sel.start = textArea.value.length; + sel.end = textArea.value.length; + + textArea.focus(); + if(document.getSelection) { // Mozilla et al. + sel.start = textArea.selectionStart; + sel.end = textArea.selectionEnd; + sel.scroll = textArea.scrollTop; + } else if(document.selection) { // MSIE + /* + * This huge lump of code is neccessary to work around two MSIE bugs: + * + * 1. Selections trim newlines at the end of the code + * 2. Selections count newlines as two characters + */ + + // The current selection + sel.rangeCopy = document.selection.createRange().duplicate(); + + var before_range = document.body.createTextRange(); + before_range.moveToElementText(textArea); // Selects all the text + before_range.setEndPoint("EndToStart", sel.rangeCopy); // Moves the end where we need it + + var before_finished = false, selection_finished = false; + var before_text, selection_text; + // Load the text values we need to compare + before_text = before_range.text; + selection_text = sel.rangeCopy.text; + + sel.start = before_text.length; + sel.end = sel.start + selection_text.length; + + // Check each range for trimmed newlines by shrinking the range by 1 character and seeing + // if the text property has changed. If it has not changed then we know that IE has trimmed + // a \r\n from the end. + do { + if (!before_finished) { + if (before_range.compareEndPoints("StartToEnd", before_range) == 0) { + before_finished = true; + } else { + before_range.moveEnd("character", -1); + if (before_range.text == before_text) { + sel.start += 2; + sel.end += 2; + } else { + before_finished = true; + } + } + } + if (!selection_finished) { + if (sel.rangeCopy.compareEndPoints("StartToEnd", sel.rangeCopy) == 0) { + selection_finished = true; + } else { + sel.rangeCopy.moveEnd("character", -1); + if (sel.rangeCopy.text == selection_text) { + sel.end += 2; + } else { + selection_finished = true; + } + } + } + } while ((!before_finished || !selection_finished)); + + + // count number of newlines in str to work around stupid IE selection bug + var countNL = function(str) { + var m = str.split("\r\n"); + if (!m || !m.length) return 0; + return m.length-1; + }; + sel.fix = countNL(sel.obj.value.substring(0,sel.start)); + + } + return sel; +} + +/** + * Set the selection + * + * You need to get a selection object via getSelection() first, then modify the + * start and end properties and pass it back to this function. + * + * @link http://groups.drupal.org/node/1210 + * @author Andreas Gohr <andi@splitbrain.org> + * @param object selection - a selection object as returned by getSelection() + */ +function setSelection(selection){ + if(document.getSelection){ // FF + // what a pleasure in FF ;) + selection.obj.setSelectionRange(selection.start,selection.end); + if(selection.scroll) selection.obj.scrollTop = selection.scroll; + } else if(document.selection) { // IE + selection.rangeCopy.collapse(true); + selection.rangeCopy.moveStart('character',selection.start - selection.fix); + selection.rangeCopy.moveEnd('character',selection.end - selection.start); + selection.rangeCopy.select(); + } +} + +/** + * Inserts the given text at the current cursor position or replaces the current + * selection + * + * @author Andreas Gohr <andi@splitbrain.org> + * @param string text - the new text to be pasted + * @param objct selecttion - selection object returned by getSelection + * @param int opts.startofs - number of charcters at the start to skip from new selection + * @param int opts.endofs - number of characters at the end to skip from new selection + * @param bool opts.nosel - set true if new text should not be selected + */ +function pasteText(selection,text,opts){ + if(!opts) opts = {}; + // replace the content + + selection.obj.value = + selection.obj.value.substring(0, selection.start) + text + + selection.obj.value.substring(selection.end, selection.obj.value.length); + + // set new selection + selection.end = selection.start + text.length; + + // modify the new selection if wanted + if(opts.startofs) selection.start += opts.startofs; + if(opts.endofs) selection.end -= opts.endofs; + + // no selection wanted? set cursor to end position + if(opts.nosel) selection.start = selection.end; + + setSelection(selection); +} + + +/** + * Format selection + * + * Apply tagOpen/tagClose to selection in textarea, use sampleText instead + * of selection if there is none. + * + * @author Andreas Gohr <andi@splitbrain.org> + */ +function insertTags(textAreaID, tagOpen, tagClose, sampleText){ + var txtarea = DOKUid(textAreaID); + + var selection = getSelection(txtarea); + var text = selection.getText(); + var opts; + + // don't include trailing space in selection + if(text.charAt(text.length - 1) == ' '){ + selection.end--; + text = selection.getText(); + } + + if(!text){ + // nothing selected, use the sample text and select it + text = sampleText; + opts = { + startofs: tagOpen.length, + endofs: tagClose.length + }; + }else{ + // place cursor at the end + opts = { + nosel: true + }; + } + + // surround with tags + text = tagOpen + text + tagClose; + + // do it + pasteText(selection,text,opts); +} + +/** + * Wraps around pasteText() for backward compatibility + * + * @author Andreas Gohr <andi@splitbrain.org> + */ +function insertAtCarret(textAreaID, text){ + var txtarea = DOKUid(textAreaID); + var selection = getSelection(txtarea); + pasteText(selection,text,{nosel: true}); +} + |