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/**
* @fileOverview The JavaScript component of the Tab Override MediaWiki extension
* @author Bill Bryant
* @version 2.0.1-MediaWiki
* @note Rewritten by Jack Phoenix to work without legacy JS globals
* @url http://tinsology.net/plugins/tab-override/ Original source code etc.
*/

// register the keydown event listener on the content textarea element
// after the window is loaded to make sure that the element is accessible
// using the document's getElementById method
jQuery( document ).ready( function() {
// only on edit pages (action=edit in the URL)
// action=submit is preview mode (the "Show preview" button has been pressed)
if (
mw.config.get( 'wgAction' ) !== 'edit' ||
mw.config.get( 'wgAction' ) !== 'submit'
)
{
return;
}

var content = jQuery( '#wpTextbox1' ); // the MediaWiki page edit textarea

// if there is no content textarea element on this page, do nothing
if ( !content.length ) {
return;
}

content.keydown( function( e ) {
var text, // initial text in the textarea
range, // the IE TextRange object
tempRange, // used to calculate selection start and end positions in IE
preNewlines, // the number of newline (\r\n) characters before the selection start (for IE)
selNewlines, // the number of newline (\r\n) characters within the selection (for IE)
initScrollTop, // initial scrollTop value to fix scrolling in Firefox
selStart, // the selection start position
selEnd, // the selection end position
sel, // the selected text
startLine, // for multi-line selections, the first character position of the first line
endLine, // for multi-line selections, the last character position of the last line
numTabs, // the number of tabs inserted / removed in the selection
startTab, // if a tab was removed from the start of the first line
preTab; // if a tab was removed before the start of the selection

// tab key - insert / remove tab
if ( e.keyCode === 9 ) {
// initialize variables
text = this.value;
initScrollTop = this.scrollTop; // scrollTop is supported by all modern browsers
numTabs = 0;
startTab = 0;
preTab = 0;

if ( typeof this.selectionStart !== 'undefined' ) {
selStart = this.selectionStart;
selEnd = this.selectionEnd;
sel = text.slice( selStart, selEnd );
} else if ( document.selection ) { // IE
range = document.selection.createRange();
sel = range.text;
tempRange = range.duplicate();
tempRange.moveToElementText( this );
tempRange.setEndPoint( 'EndToEnd', range );
selEnd = tempRange.text.length;
selStart = selEnd - sel.length;
// whenever the value of the textarea is changed, the range needs to be reset
// IE (and Opera) use both \r and \n for newlines - this adds an extra character
// that needs to be accounted for when doing position calculations
// these values are used to offset the selection start and end positions
preNewlines = text.slice( 0, selStart ).split( '\r\n' ).length - 1;
selNewlines = sel.split( '\r\n' ).length - 1;
} else {
// cannot access textarea selection - do nothing
return;
}

// special case of multi-line selection
if ( selStart !== selEnd && sel.indexOf( '\n' ) !== -1 ) {
// for multiple lines, only insert / remove tabs from the beginning of each line

// find the start of the first selected line
if ( selStart === 0 || text.charAt( selStart - 1 ) === '\n' ) {
// the selection starts at the beginning of a line
startLine = selStart;
} else {
// the selection starts after the beginning of a line
// set startLine to the beginning of the first partially selected line
// subtract 1 from selStart in case the cursor is at the newline character,
// for instance, if the very end of the previous line was selected
// add 1 to get the next character after the newline
// if there is none before the selection, lastIndexOf returns -1
// when 1 is added to that it becomes 0 and the first character is used
startLine = text.lastIndexOf( '\n', selStart - 1 ) + 1;
}

// find the end of the last selected line
if ( selEnd === text.length || text.charAt( selEnd ) === '\n' ) {
// the selection ends at the end of a line
endLine = selEnd;
} else {
// the selection ends before the end of a line
// set endLine to the end of the last partially selected line
endLine = text.indexOf( '\n', selEnd );
if ( endLine === -1 ) {
endLine = text.length;
}
}

// if the shift key was pressed, remove tabs instead of inserting them
if ( e.shiftKey ) {
if ( text.charAt( startLine ) === '\t' ) {
// is this tab part of the selection?
if ( startLine === selStart ) {
// it is, remove it
sel = sel.slice( 1 );
} else {
// the tab comes before the selection
preTab = 1;
}
startTab = 1;
}

this.value = text.slice( 0, startLine ) + text.slice( startLine + preTab, selStart ) +
sel.replace( /\n\t/g, function() {
numTabs += 1;
return '\n';
}) + text.slice( selEnd );

// set start and end points
if ( range ) { // IE
// setting end first makes calculations easier
range.collapse();
range.moveEnd( 'character', selEnd - startTab - numTabs - selNewlines - preNewlines );
range.moveStart( 'character', selStart - preTab - preNewlines );
range.select();
} else {
// set start first for Opera
this.selectionStart = selStart - preTab; // preTab is 0 or 1
// move the selection end over by the total number of tabs removed
this.selectionEnd = selEnd - startTab - numTabs;
}
} else {
// no shift key
// insert tabs at the beginning of each line of the selection
this.value = text.slice( 0, startLine ) + '\t' + text.slice( startLine, selStart ) +
sel.replace( /\n/g, function() {
numTabs += 1;
return '\n\t';
}) + text.slice( selEnd );

// set start and end points
if ( range ) { // IE
range.collapse();
range.moveEnd( 'character', selEnd + 1 - preNewlines ); // numTabs cancels out selNewlines
range.moveStart( 'character', selStart + 1 - preNewlines );
range.select();
} else {
// the selection start is always moved by 1 character
this.selectionStart = selStart + 1;
// move the selection end over by the total number of tabs inserted
this.selectionEnd = selEnd + 1 + numTabs;
}
}
} else {
// "normal" case (no selection or selection on one line only)

// if the shift key was pressed, remove a tab instead of inserting one
if ( e.shiftKey ) {
// if the character before the selection is a tab, remove it
if ( text.charAt( selStart - 1 ) === '\t' ) {
this.value = text.slice( 0, selStart - 1 ) + text.slice( selStart );

// set start and end points
if ( range ) { // IE
// collapses range and moves it by -1 character
range.move( 'character', selStart - 1 - preNewlines );
range.select();
} else {
this.selectionEnd = this.selectionStart = selStart - 1;
}
}
} else {
// no shift key - insert a tab
if ( range ) { // IE
// if no text is selected and the cursor is at the beginning of a line
// (except the first line), IE places the cursor at the carriage return character
// the tab must be placed after the \r\n pair
if ( text.charAt( selStart ) === '\r' ) {
this.value = text.slice( 0, selStart + 2 ) + '\t' + text.slice( selEnd + 2 );
// collapse the range and move it to the appropriate location
range.move( 'character', selStart + 2 - preNewlines );
} else {
this.value = text.slice( 0, selStart ) + '\t' + text.slice( selEnd );
// collapse the range and move it to the appropriate location
range.move( 'character', selStart + 1 - preNewlines );
}
range.select();
} else {
this.value = text.slice( 0, selStart ) + '\t' + text.slice( selEnd );
this.selectionEnd = this.selectionStart = selStart + 1;
}
}
}

// this is really just for Firefox, but will be executed by all browsers
// whenever the textarea value property is reset, Firefox scrolls back to the top
// this will reset it to the original scroll value
this.scrollTop = initScrollTop;

// prevent the default action
if ( e.preventDefault ) {
e.preventDefault();
}
e.returnValue = false;
}
} ).keypress( function( e ) {
// Opera (and Firefox) also fire a keypress event when the tab key is pressed
// Opera requires that the default action be prevented on this event, or the
// textarea will lose focus (preventDefault is enough, IE never fires this
// for the tab key)
if ( e.keyCode === 9 && e.preventDefault ) {
e.preventDefault();
}
} );
} );

MediaWiki:Gadget-TabOverride.js - Bewerkingsoverzicht

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