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/*
SelectionRange Class - Copyright 2005 Six Apart
$Id: SelectionRange.js 164 2007-04-25 20:41:19Z ydnar $
*/
SelectionRange = new Class( Object, {
init: function() {
// mozilla selection
if( arguments[ 0 ].getRangeAt )
this.fromMozillaSelection( arguments[ 0 ] );
// khtml (safari) selection
else if( arguments[ 0 ].setBaseAndExtent )
this.fromKHTMLSelection( arguments[ 0 ] );
// w3c range
else if( arguments[ 0 ].selectNodeContents )
this.fromRange( arguments[ 0 ] );
// internet explorer selection
else if( arguments[ 0 ].createRange )
this.fromIESelection( arguments[ 0 ] );
// internet explorer control range
else if( arguments[ 0 ].addElement )
this.fromIEControlRange( arguments[ 0 ] );
// internet explorer text range
else if( arguments[ 0 ].compareEndPoints )
this.fromIETextRange( arguments[ 0 ] );
// 4-argument form
else {
this.startContainer = arguments[ 0 ];
this.startOffset = arguments[ 1 ];
this.endContainer = arguments[ 2 ] || arguments[ 0 ];
this.endOffset = arguments[ 3 ] || arguments[ 1 ];
}
},
fromMozillaSelection: function( selection ) {
var range = selection.getRangeAt( 0 );
this.fromRange( range );
},
fromKHTMLSelection: function( selection ) {
this.startContainer = selection.baseNode;
this.startOffset = selection.baseOffset;
this.endContainer = selection.extentNode;
this.endOffset = selection.extentOffset;
},
fromIESelection: function( selection ) {
var range = selection.createRange();
this.fromIERange( range );
},
fromRange: function( range ) {
this.startContainer = range.startContainer;
this.startOffset = range.startOffset;
this.endContainer = range.endContainer;
this.endOffset = range.endOffset;
},
fromIERange: function( range ) {
if( range.addElement )
this.fromIEControlRange( range );
else if( range.compareEndPoints )
this.fromIETextRange( range );
},
fromIEControlRange: function( range ) {
// fixme: this is kinda broken
this.startContainer = range.item( 0 );
this.startOffset = 0;
this.endContainer = range.item( range.length - 1 );
this.endOffset = 0;
},
fromIETextRange: function( range ) {
var position = this.findIETextRangePosition( range, "StartToStart" );
this.startContainer = position.node;
this.startOffset = position.offset;
position = this.findIETextRangePosition( range, "EndToEnd" );
this.endContainer = position.node;
this.endOffset = position.offset;
},
findIETextRangePosition: function( range, compareType ) {
var range2 = range.duplicate();
range2.collapse( true );
var parent = range2.parentElement();
range2.moveToElementText( parent );
var length = range2.text.length;
var delta = max( 1, finiteInt( length * 0.5 ) );
range2.collapse( true );
var offset = 0;
var offsets = {};
var steps = 0;
var broken = false;
/* this breaks if the user selects all, where the selection endpoint is at the end of body */
/* hence storing previously-visited offsets */
while( test = range2.compareEndPoints( compareType, range ) ) {
if( test < 0 ) {
range2.move( "character", delta );
offset += delta;
} else {
range2.move( "character", -delta );
offset -= delta;
}
delta = max( 1, finiteInt( delta * 0.5 ) );
/* visited this offset before? */
if( offsets[ offset ] === offset ) {
broken = true;
break;
}
offsets[ offset ] = offset;
/* infinite loop bug */
steps++;
if( steps > 1000 || (offset < 0 || offset > length + 1) ) {
broken = true;
break;
}
}
/*
if( broken )
log( "BROKEN: " + parent.tagName + " " + length + " " + compareType + " " + test + " " + delta + " " + offset );
else
log( "GOOD: " + parent.tagName + " " + offset );
*/
return DOM.Proxy.findTextPosition( parent, offset );
},
setStart: function( startContainer, startOffset ) {
this.startContainer = startContainer;
this.startOffset = startOffset;
},
setEnd: function( endContainer, endOffset ) {
this.endContainer = endContainer;
this.endOffset = endOffset;
},
collapse: function( toStart ) {
if( toStart )
this.setEnd( this.startContainer, this.startOffset );
else
this.setStart( this.endContainer, this.endOffset );
},
getCommonAncestorContainer: function() {
if( this.startContainer == this.endContainer )
return this.startContainer;
var start = DOM.getAncestors( this.startContainer, true );
var end = DOM.getAncestors( this.endContainer, true );
var common = null;
for( i = 1; i <= start.length && i <= end.length; i++ ) {
if( start[ start.length - i ] == end[ end.length - i ] )
common = start[ start.length - i ];
}
return common;
},
getNodes: function() {
var nodes = [];
if( !this.startContainer )
return nodes;
nodes.push( this.startContainer );
if( this.startContainer === this.endContainer &&
(this.startOffset == this.endOffset || !this.startContainer.firstChild) )
return nodes;
var proxy = new DOM.Proxy( this.startContainer );
while( proxy.getNextNode() && proxy.node != this.endContainer )
nodes.push( proxy.node );
return nodes;
},
getTextNodes: function() {
var proxy = new DOM.Proxy( this.startContainer );
var nodes = proxy.node.nodeType == Node.TEXT_NODE ? [ proxy.node ] : [];
while( proxy.node != this.endContainer ) {
proxy.getNextNode();
if( proxy.node.nodeType == Node.TEXT_NODE )
nodes.push( proxy.node );
}
return nodes;
},
surround: function( tagName, attributes ) {
// fixme: make this work with non-text nodes
if( this.startContainer.nodeType != Node.TEXT_NODE ||
this.endContainer.nodeType != Node.TEXT_NODE )
return;
var nodes = this.getTextNodes();
var last;
for( var i = 0; i < nodes.length; i++ ) {
var node = nodes[ i ];
var startOffset = i == 0
? this.startOffset
: 0;
var endOffset = i == (nodes.length - 1)
? this.endOffset
: node.nodeValue.length
var inside = this.surroundTextNode( node, startOffset, endOffset, tagName, attributes );
if( i == 0 )
this.setStart( inside, 0 );
if( i == (nodes.length - 1) )
this.setEnd( inside, inside.nodeValue.length );
}
return last;
},
surroundTextNode: function( node, startOffset, endOffset, tagName, attributes ) {
var document = this.startContainer.ownerDocument;
var parent = node.parentNode;
if( endOffset < startOffset ) {
var temp = endOffset;
endOffset = startOffset;
startOffset = temp;
}
var element = document.createElement( tagName );
for( var attribute in attributes ) {
if( attributes.hasOwnProperty( attribute ) ) {
if( attribute == "class" )
element.className = attributes[ attribute ];
else
element.setAttribute( attribute, attributes[ attribute ] );
}
}
var value = node.nodeValue;
var inner = document.createTextNode( value.substring( startOffset, endOffset ) );
element.appendChild( inner );
parent.replaceChild( element, node );
if( startOffset > 0 ) {
var before = document.createTextNode( value.substring( 0, startOffset ) );
parent.insertBefore( before, element );
}
if( endOffset < value.length ) {
var after = document.createTextNode( value.substring( endOffset, value.length ) );
parent.insertBefore( after, element.nextSibling );
}
return inner;
},
replaceText: function( value ) {
var offset = 0;
var nodes = this.getTextNodes();
for( var i = 0; i < nodes.length; i++ ) {
var node = nodes[ i ];
var nodeValue = node.nodeValue;
if( offset >= value.length && value.length > 0 )
value = "";
if( node === this.startContainer ) {
var delta = nodeValue.length - this.startOffset;
if( delta > (value.length - offset) ||
node === this.endContainer )
delta = value.length - offset;
node.nodeValue = nodeValue.substring( 0, this.startOffset )
+ value.substr( offset, delta );
offset += delta;
} else if( node === this.endContainer ) {
node.nodeValue = value.substring( offset, value.length ) +
nodeValue.substring( this.endOffset, nodeValue.length );
offset = value.length;
} else {
var delta = nodeValue.length;
node.nodeValue = value.substr( offset, delta );
offset += delta;
}
}
}
} );
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