mirror of
https://github.com/jquery/jquery-ui.git
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306 lines
8.1 KiB
JavaScript
306 lines
8.1 KiB
JavaScript
/*
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* jQuery UI Draggable @VERSION
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*
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* Copyright 2011, AUTHORS.txt (http://jqueryui.com/about)
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* Dual licensed under the MIT or GPL Version 2 licenses.
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* http://jquery.org/license
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*
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* http://docs.jquery.com/UI/Draggable
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*
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* Depends:
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* jquery.ui.core.js
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* jquery.ui.interaction.js
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* jquery.ui.widget.js
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*/
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(function( $, undefined ) {
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$.widget( "ui.draggable", $.ui.interaction, {
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version: "@VERSION",
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widgetEventPrefix: "drag",
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options: {
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handle: null,
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helper: null
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},
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// dragEl: element being dragged (original or helper)
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// position: final CSS position of dragEl
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// offset: offset of dragEl
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// startCoords: pageX/Y of the mousedown (offset of pointer)
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// startPosition: CSS position prior to drag start
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// startOffset: offset prior to drag start
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// tempPosition: overridable CSS position of dragEl
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// overflowOffset: offset of scroll parent
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// overflow: object containing width and height keys of scroll parent
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_create: function() {
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this._super();
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// Static position elements can't be moved with top/left
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if ( this.element.css( "position" ) === "static" ) {
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this.element.css( "position", "relative" );
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}
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},
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/** interaction interface **/
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_isValidTarget: function( element ) {
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return this.options.handle ? element.is( this.options.handle ) : true;
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},
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_start: function( event, position ) {
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// The actual dragging element, should always be a jQuery object
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this.dragEl = this.element;
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// Helper required
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if ( this.options.helper ) {
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// clone
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if ( this.options.helper === true ) {
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this.dragEl = this.element.clone()
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.removeAttr( "id" )
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.find( "[id]" )
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.removeAttr( "id" )
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.end();
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} else {
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// TODO: figure out the signature for this; see #4957
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this.dragEl = $( this.options.helper() );
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}
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this.dragEl
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// Helper must be absolute to function properly
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.css( "position", "absolute" )
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// TODO: add appendTo option
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.appendTo( this.document[0].body )
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.offset( this.element.offset() );
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}
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this.cssPosition = this.dragEl.css( "position" );
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this.scrollParent = this.element.scrollParent();
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// Cache starting absolute and relative positions
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this.startPosition = this._getPosition();
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this.startOffset = this.dragEl.offset();
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// Cache current position and offset
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this.position = $.extend( {}, this.startPosition );
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this.offset = $.extend( {}, this.startOffset );
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this.startCoords = position;
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// Cache the offset of scrollParent, if required for _handleScrolling
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if ( this.scrollParent[0] !== this.document[0] && this.scrollParent[0].tagName !== "HTML" ) {
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this.overflowOffset = this.scrollParent.offset();
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}
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this.overflow = {
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height: this.scrollParent[0] === this.document[0] ?
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this.window.height() : this.scrollParent.height(),
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width: this.scrollParent[0] === this.document[0] ?
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this.window.width() : this.scrollParent.width()
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};
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this._preparePosition( position );
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// If user cancels start, don't allow dragging
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if ( this._trigger( "start", event, this._uiHash() ) === false ) {
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return false;
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}
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this._blockFrames();
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this._setCss();
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return true;
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},
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_move: function( event, position ) {
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this._preparePosition( position );
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// If user cancels drag, don't move the element
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if ( this._trigger( "drag", event, this._uiHash() ) === false ) {
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return;
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}
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this._setCss();
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// Scroll the scrollParent, if needed
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this._handleScrolling( position );
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},
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_stop: function( event, position ) {
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this._preparePosition( position );
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// If user cancels stop, leave helper there, disallow any CSS changes
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if ( this._trigger( "stop", event, this._uiHash() ) !== false ) {
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this._setCss();
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if ( this.options.helper ) {
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this.dragEl.remove();
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}
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}
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this._unblockFrames();
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},
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/** internal **/
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_getPosition: function() {
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var left, top, position,
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scrollTop = this.scrollParent.scrollTop(),
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scrollLeft = this.scrollParent.scrollLeft();
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// If fixed or absolute
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if ( this.cssPosition !== "relative" ) {
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position = this.dragEl.position();
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// Take into account scrollbar
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position.top -= scrollTop;
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position.left -= scrollLeft;
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return position;
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}
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// When using relative, css values are checked
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// Otherwise the position wouldn't account for padding on ancestors
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left = this.dragEl.css( "left" );
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top = this.dragEl.css( "top" );
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// Webkit will give back auto if there is no explicit value
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left = ( left === "auto" ) ? 0: parseInt( left, 10 );
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top = ( top === "auto" ) ? 0: parseInt( top, 10 );
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return {
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left: left - scrollLeft,
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top: top - scrollTop
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};
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},
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_handleScrolling: function( position ) {
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var scrollTop = this.scrollParent.scrollTop(),
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scrollLeft = this.scrollParent.scrollLeft(),
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scrollSensitivity = 20,
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baseSpeed = 5,
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speed = function( distance ) {
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return baseSpeed + Math.round( distance / 2 );
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},
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// overflowOffset is only set when scrollParent is not doc/html
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overflowLeft = this.overflowOffset ?
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this.overflowOffset.left :
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scrollLeft,
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overflowTop = this.overflowOffset ?
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this.overflowOffset.top :
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scrollTop,
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xRight = this.overflow.width + overflowLeft - position.left,
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xLeft = position.left - overflowLeft,
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yBottom = this.overflow.height + overflowTop - position.top,
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yTop = position.top - overflowTop;
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// Handle vertical scrolling
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if ( yBottom < scrollSensitivity ) {
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this.scrollParent.scrollTop( scrollTop +
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speed( scrollSensitivity - yBottom ) );
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} else if ( yTop < scrollSensitivity ) {
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this.scrollParent.scrollTop( scrollTop -
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speed( scrollSensitivity - yTop ) );
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}
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// Handle horizontal scrolling
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if ( xRight < scrollSensitivity ) {
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this.scrollParent.scrollLeft( scrollLeft +
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speed( scrollSensitivity - xRight ) );
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} else if ( xLeft < scrollSensitivity ) {
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this.scrollParent.scrollLeft( scrollLeft -
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speed( scrollSensitivity - xLeft ) );
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}
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},
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// Uses event to determine new position of draggable, before any override from callbacks
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// TODO: handle absolute element inside relative parent like a relative element
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_preparePosition: function( position ) {
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var leftDiff = position.left - this.startCoords.left,
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topDiff = position.top - this.startCoords.top,
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newLeft = leftDiff + this.startPosition.left,
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newTop = topDiff + this.startPosition.top;
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// Save off new values for .css() in various callbacks using this function
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this.position = {
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left: newLeft,
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top: newTop
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};
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// Save off values to compare user override against automatic coordinates
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this.tempPosition = {
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left: newLeft,
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top: newTop
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};
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// Refresh offset cache with new positions
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this.offset.left = this.startOffset.left + leftDiff;
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this.offset.top = this.startOffset.top + topDiff;
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},
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// Places draggable where event, or user via event/callback, indicates
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_setCss: function() {
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var newLeft = this.position.left,
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newTop = this.position.top;
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// User overriding left/top so shortcut math is no longer valid
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if ( this.tempPosition.left !== this.position.left ||
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this.tempPosition.top !== this.position.top ) {
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// Reset offset based on difference of expected and overridden values
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this.offset.left += newLeft - this.tempPosition.left;
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this.offset.top += newTop - this.tempPosition.top;
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}
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// TODO: does this work with nested scrollable parents?
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if ( this.cssPosition !== "fixed" ) {
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newLeft += this.scrollParent.scrollLeft();
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newTop += this.scrollParent.scrollTop();
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}
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this.dragEl.css({
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left: newLeft,
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top: newTop
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});
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},
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_uiHash: function() {
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// TODO: add originalPosition
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var ret = {
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position: this.position,
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offset: this.offset
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};
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if ( this.options.helper ) {
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ret.helper = this.dragEl;
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}
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return ret;
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},
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_blockFrames: function() {
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var body = this.document[0].body;
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this.iframeBlocks = this.document.find( "iframe" ).map(function() {
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var iframe = $( this ),
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iframeOffset = iframe.offset();
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return $( "<div>" )
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.css({
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position: "absolute",
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width: iframe.outerWidth(),
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height: iframe.outerHeight(),
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top: iframeOffset.top,
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left: iframeOffset.left
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})
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.appendTo( body )[0];
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});
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},
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_unblockFrames: function() {
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if ( this.iframeBlocks ) {
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this.iframeBlocks.remove();
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delete this.iframeBlocks;
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}
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}
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});
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})( jQuery );
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