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Draggable: Cleanup.

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This commit is contained in:
Scott González 2012-01-07 12:18:08 -05:00
parent bf9a9339e5
commit b7a0c6a4cf
1 changed files with 39 additions and 73 deletions
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112
ui/jquery.ui.draggable.js vendored
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@ -1,7 +1,7 @@
/*
* jQuery UI Draggable @VERSION
*
* CopyBottom 2011, AUTHORS.txt (http://jqueryui.com/about)
* Copyright 2011, AUTHORS.txt (http://jqueryui.com/about)
* Dual licensed under the MIT or GPL Version 2 licenses.
* http://jquery.org/license
*
@ -71,71 +71,45 @@ $.widget( "ui.draggable", $.ui.interaction, {
},
_handleScrolling: function( event ) {
var xScrollSpeed, yScrollSpeed,
distances = {},
scrollTop = this.scrollParent.scrollTop(),
var scrollTop = this.scrollParent.scrollTop(),
scrollLeft = this.scrollParent.scrollLeft(),
scrollSensitivity = 20,
baseSpeed = 5,
speed = function( distance ) {
return baseSpeed + Math.round( distance / 2 );
};
// overflowOffset is only set when scrollParent is not doc/html
if ( !this.overflowOffset ) {
distances.xRight = ( this.overflow.width + scrollLeft ) - event.pageX;
distances.xLeft = event.pageX - scrollLeft;
distances.yBottom = ( this.overflow.height + scrollTop ) - event.pageY;
distances.yTop = event.pageY - scrollTop;
} else {
distances.xRight = ( this.overflow.width + this.overflowOffset.left ) - event.pageX;
distances.xLeft = event.pageX - this.overflowOffset.left;
distances.yBottom = ( this.overflow.height + this.overflowOffset.top ) - event.pageY;
distances.yTop = event.pageY - this.overflowOffset.top;
}
},
// overflowOffset is only set when scrollParent is not doc/html
overflowLeft = this.overflowOffset ?
this.overflowOffset.left :
scrollLeft,
overflowTop = this.overflowOffset ?
this.overflowOffset.top :
scrollTop,
xRight = this.overflow.width + overflowLeft - event.pageX,
xLeft = event.pageX - overflowLeft,
yBottom = this.overflow.height + overflowTop - event.pageY,
yTop = event.pageY - overflowTop;
// Handle vertical scrolling
if ( distances.yBottom < scrollSensitivity ) {
yScrollSpeed = speed( scrollSensitivity - distances.yBottom );
this.scrollParent.scrollTop( scrollTop + yScrollSpeed );
}
else if ( distances.yTop < scrollSensitivity ) {
yScrollSpeed = speed( scrollSensitivity - distances.yTop );
this.scrollParent.scrollTop( scrollTop - yScrollSpeed );
if ( yBottom < scrollSensitivity ) {
this.scrollParent.scrollTop( scrollTop +
speed( scrollSensitivity - yBottom ) );
} else if ( yTop < scrollSensitivity ) {
this.scrollParent.scrollTop( scrollTop -
speed( scrollSensitivity - yTop ) );
}
// Handle horizontal scrolling
if ( distances.xRight < scrollSensitivity ) {
xScrollSpeed = speed( scrollSensitivity - distances.xRight );
this.scrollParent.scrollLeft( scrollLeft + xScrollSpeed );
if ( xRight < scrollSensitivity ) {
this.scrollParent.scrollLeft( scrollLeft +
speed( scrollSensitivity - xRight ) );
} else if ( xLeft < scrollSensitivity ) {
this.scrollParent.scrollLeft( scrollLeft -
speed( scrollSensitivity - xLeft ) );
}
else if ( distances.xLeft < scrollSensitivity ) {
xScrollSpeed = speed( scrollSensitivity - distances.xLeft );
this.scrollParent.scrollLeft( scrollLeft - xScrollSpeed );
}
},
_start: function( event ) {
var newLeft, newTop;
// The actual dragging element, should always be a jQuery object
this.dragEl = this.element;
@ -177,17 +151,16 @@ $.widget( "ui.draggable", $.ui.interaction, {
};
// Cache the offset of scrollParent, if required for _handleScrolling
if ( this.scrollParent[0] !== this.document[0] && this.scrollParent[0].tagName !== 'HTML') {
if ( this.scrollParent[0] !== this.document[0] && this.scrollParent[0].tagName !== "HTML" ) {
this.overflowOffset = this.scrollParent.offset();
}
this.overflow = {};
this.overflow.height = ( this.scrollParent[0] === this.document[0] ) ?
this.window.height() : this.scrollParent.height();
this.overflow.width = ( this.scrollParent[0] === this.document[0] ) ?
this.window.width() : this.scrollParent.width();
this.overflow = {
height: this.scrollParent[0] === this.document[0] ?
this.window.height() : this.scrollParent.height(),
width: this.scrollParent[0] === this.document[0] ?
this.window.width() : this.scrollParent.width()
};
this._preparePosition( event );
@ -201,8 +174,6 @@ $.widget( "ui.draggable", $.ui.interaction, {
},
_move: function( event ) {
var newLeft, newTop;
this._preparePosition( event );
// If user stops propagation, leave helper there ( if there's one ), disallow any CSS changes
@ -232,7 +203,6 @@ $.widget( "ui.draggable", $.ui.interaction, {
// Uses event to determine new position of draggable, before any override from callbacks
// TODO: handle absolute element inside relative parent like a relative element
// possibly have user set flag to avoid DOM lookup
_preparePosition: function( event ) {
var leftDiff = event.clientX - this.startCoords.left,
topDiff = event.clientY - this.startCoords.top,
@ -258,21 +228,17 @@ $.widget( "ui.draggable", $.ui.interaction, {
// Places draggable where mouse or user from callback indicates
_setCss: function( event ) {
var newLeft, newTop, oTop, oLeft;
var newLeft, newTop;
// User overriding left/top so shortcut math is no longer valid
if ( this.tempPosition.left !== this.position.left || this.tempPosition.top !== this.position.top ) {
// Get the difference of automatic coordinates vs what user overrode
oTop = this.position.top - this.tempPosition.top;
oLeft = this.position.left - this.tempPosition.left;
// Reset offset based on math
this.offset.top = this.offset.top + oTop;
this.offset.left = this.offset.left + oLeft;
// Reset offset based on difference of expected and overridden values
this.offset.top = this.offset.top +
this.position.top - this.tempPosition.top;
this.offset.left = this.offset.left +
this.position.left - this.tempPosition.left;
this.offset = this.dragEl.offset();
}
newLeft = this.position.left;