all files / src/src/widgets/ PopupWidget.js

36.54% Statements 95/260
11.43% Branches 24/210
36% Functions 9/25
36.54% Lines 95/260
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784                                                                                                                                                  444×     444×     444× 444×     444× 444× 444×       444×     444×   444× 444× 444× 444× 444× 444× 444× 444× 444×     444× 444× 444× 444× 444× 444× 444× 444× 444×     444×         444×       444× 444×     444×                                   444×                   444× 444×                                                                                                                                                                                                                                                                       444×   444× 444× 444× 444×         444×                                                                                                                                                                                                                                                                                                                                                     444× 444× 444× 444×                         444×     444× 444×         444×   444×             444×                                                                                                                                                                                                                                                                                                                                                             444× 444×       444×                                 444×     444× 444×                                   444×   444× 444×                     444×                 400× 400× 400× 400×   400×    
/**
 * PopupWidget is a container for content. The popup is overlaid and positioned absolutely.
 * By default, each popup has an anchor that points toward its origin.
 * Please see the [OOUI documentation on MediaWiki.org] [1] for more information and examples.
 *
 * Unlike most widgets, PopupWidget is initially hidden and must be shown by calling #toggle.
 *
 *     @example
 *     // A PopupWidget.
 *     var popup = new OO.ui.PopupWidget( {
 *         $content: $( '<p>Hi there!</p>' ),
 *         padded: true,
 *         width: 300
 *     } );
 *
 *     $( document.body ).append( popup.$element );
 *     // To display the popup, toggle the visibility to 'true'.
 *     popup.toggle( true );
 *
 * [1]: https://www.mediawiki.org/wiki/OOUI/Widgets/Popups
 *
 * @class
 * @extends OO.ui.Widget
 * @mixins OO.ui.mixin.IconElement
 * @mixins OO.ui.mixin.LabelElement
 * @mixins OO.ui.mixin.ClippableElement
 * @mixins OO.ui.mixin.FloatableElement
 *
 * @constructor
 * @param {Object} [config] Configuration options
 * @cfg {number|null} [width=320] Width of popup in pixels. Pass `null` to use automatic width.
 * @cfg {number|null} [height=null] Height of popup in pixels. Pass `null` to use automatic height.
 * @cfg {boolean} [anchor=true] Show anchor pointing to origin of popup
 * @cfg {string} [position='below'] Where to position the popup relative to $floatableContainer
 *  'above': Put popup above $floatableContainer; anchor points down to the horizontal center
 *    of $floatableContainer
 *  'below': Put popup below $floatableContainer; anchor points up to the horizontal center
 *    of $floatableContainer
 *  'before': Put popup to the left (LTR) / right (RTL) of $floatableContainer; anchor points
 *    endwards (right/left) to the vertical center of $floatableContainer
 *  'after': Put popup to the right (LTR) / left (RTL) of $floatableContainer; anchor points
 *    startwards (left/right) to the vertical center of $floatableContainer
 * @cfg {string} [align='center'] How to align the popup to $floatableContainer
 *  'forwards': If position is above/below, move the popup as far endwards (right in LTR, left in
 *    RTL) as possible while still keeping the anchor within the popup; if position is before/after,
 *    move the popup as far downwards as possible.
 *  'backwards': If position is above/below, move the popup as far startwards (left in LTR, right in
 *    RTL) as possible while still keeping the anchor within the popup; if position is before/after,
 *     move the popup as far upwards as possible.
 *  'center': Horizontally (if position is above/below) or vertically (before/after) align the
 *     center of the popup with the center of $floatableContainer.
 * 'force-left': Alias for 'forwards' in LTR and 'backwards' in RTL
 * 'force-right': Alias for 'backwards' in RTL and 'forwards' in LTR
 * @cfg {boolean} [autoFlip=true] Whether to automatically switch the popup's position between
 *  'above' and 'below', or between 'before' and 'after', if there is not enough space in the
 *  desired direction to display the popup without clipping
 * @cfg {jQuery} [$container] Constrain the popup to the boundaries of the specified container.
 *  See the [OOUI docs on MediaWiki][3] for an example.
 *  [3]: https://www.mediawiki.org/wiki/OOUI/Widgets/Popups#containerExample
 * @cfg {number} [containerPadding=10] Padding between the popup and its container, specified as a
 *  number of pixels.
 * @cfg {jQuery} [$content] Content to append to the popup's body
 * @cfg {jQuery} [$footer] Content to append to the popup's footer
 * @cfg {boolean} [autoClose=false] Automatically close the popup when it loses focus.
 * @cfg {jQuery} [$autoCloseIgnore] Elements that will not close the popup when clicked.
 *  This config option is only relevant if #autoClose is set to `true`. See the
 *  [OOUI documentation on MediaWiki][2] for an example.
 *  [2]: https://www.mediawiki.org/wiki/OOUI/Widgets/Popups#autocloseExample
 * @cfg {boolean} [head=false] Show a popup header that contains a #label (if specified) and close
 *  button.
 * @cfg {boolean} [padded=false] Add padding to the popup's body
 */
OO.ui.PopupWidget = function OoUiPopupWidget( config ) {
	// Configuration initialization
	config = config || {};
 
	// Parent constructor
	OO.ui.PopupWidget.super.call( this, config );
 
	// Properties (must be set before ClippableElement constructor call)
	this.$body = $( '<div>' );
	this.$popup = $( '<div>' );
 
	// Mixin constructors
	OO.ui.mixin.IconElement.call( this, config );
	OO.ui.mixin.LabelElement.call( this, config );
	OO.ui.mixin.ClippableElement.call( this, $.extend( {
		$clippable: this.$body,
		$clippableContainer: this.$popup
	}, config ) );
	OO.ui.mixin.FloatableElement.call( this, config );
 
	// Properties
	this.$anchor = $( '<div>' );
	// If undefined, will be computed lazily in computePosition()
	this.$container = config.$container;
	this.containerPadding = config.containerPadding !== undefined ? config.containerPadding : 10;
	this.autoClose = !!config.autoClose;
	this.transitionTimeout = null;
	this.anchored = false;
	this.onDocumentMouseDownHandler = this.onDocumentMouseDown.bind( this );
	this.onDocumentKeyDownHandler = this.onDocumentKeyDown.bind( this );
	this.onTabKeyDownHandler = this.onTabKeyDown.bind( this );
	this.onShiftTabKeyDownHandler = this.onShiftTabKeyDown.bind( this );
 
	// Initialization
	this.setSize( config.width, config.height );
	this.toggleAnchor( config.anchor === undefined || config.anchor );
	this.setAlignment( config.align || 'center' );
	this.setPosition( config.position || 'below' );
	this.setAutoFlip( config.autoFlip === undefined || config.autoFlip );
	this.setAutoCloseIgnore( config.$autoCloseIgnore );
	this.$body.addClass( 'oo-ui-popupWidget-body' );
	this.$anchor.addClass( 'oo-ui-popupWidget-anchor' );
	this.$popup
		.addClass( 'oo-ui-popupWidget-popup' )
		.append( this.$body );
	this.$element
		.addClass( 'oo-ui-popupWidget' )
		.append( this.$popup, this.$anchor );
	// Move content, which was added to #$element by OO.ui.Widget, to the body
	// FIXME This is gross, we should use '$body' or something for the config
	Iif ( config.$content instanceof $ ) {
		this.$body.append( config.$content );
	}
 
	Eif ( config.padded ) {
		this.$body.addClass( 'oo-ui-popupWidget-body-padded' );
	}
 
	Iif ( config.head ) {
		if ( !config.hideCloseButton ) {
			this.closeButton = new OO.ui.ButtonWidget( {
				framed: false,
				icon: 'close',
				label: OO.ui.msg( 'ooui-popup-widget-close-button-aria-label' ),
				invisibleLabel: true
			} );
			this.closeButton.connect( this, {
				click: 'onCloseButtonClick'
			} );
		}
		this.$head = $( '<div>' )
			.addClass( 'oo-ui-popupWidget-head' )
			.append( this.$icon, this.$label, this.closeButton && this.closeButton.$element || '' );
		this.$popup.prepend( this.$head );
	}
 
	Iif ( config.$footer ) {
		this.$footer = $( '<div>' )
			.addClass( 'oo-ui-popupWidget-footer' )
			.append( config.$footer );
		this.$popup.append( this.$footer );
	}
 
	// Initially hidden - using #toggle may cause errors if subclasses override toggle with methods
	// that reference properties not initialized at that time of parent class construction
	// TODO: Find a better way to handle post-constructor setup
	this.visible = false;
	this.$element.addClass( 'oo-ui-element-hidden' );
};
 
/* Setup */
 
OO.inheritClass( OO.ui.PopupWidget, OO.ui.Widget );
OO.mixinClass( OO.ui.PopupWidget, OO.ui.mixin.IconElement );
OO.mixinClass( OO.ui.PopupWidget, OO.ui.mixin.LabelElement );
OO.mixinClass( OO.ui.PopupWidget, OO.ui.mixin.ClippableElement );
OO.mixinClass( OO.ui.PopupWidget, OO.ui.mixin.FloatableElement );
 
/* Events */
 
/**
 * @event ready
 *
 * The popup is ready: it is visible and has been positioned and clipped.
 */
 
/**
 * @event closing
 *
 * The popup is no longer visible.
 */
 
/* Methods */
 
/**
 * Handles document mouse down events.
 *
 * @private
 * @param {MouseEvent} e Mouse down event
 */
OO.ui.PopupWidget.prototype.onDocumentMouseDown = function ( e ) {
	if (
		this.isVisible() &&
		!OO.ui.contains( this.$element.add( this.$autoCloseIgnore ).get(), e.target, true )
	) {
		this.toggle( false );
	}
};
 
/**
 * Bind document mouse down listener.
 *
 * @private
 */
OO.ui.PopupWidget.prototype.bindDocumentMouseDownListener = function () {
	// Capture clicks outside popup
	this.getElementDocument().addEventListener( 'mousedown', this.onDocumentMouseDownHandler, true );
	// We add 'click' event because iOS safari needs to respond to this event.
	// We can't use 'touchstart' (as is usually the equivalent to 'mousedown') because
	// then it will trigger when scrolling. While iOS Safari has some reported behavior
	// of occasionally not emitting 'click' properly, that event seems to be the standard
	// that it should be emitting, so we add it to this and will operate the event handler
	// on whichever of these events was triggered first
	this.getElementDocument().addEventListener( 'click', this.onDocumentMouseDownHandler, true );
};
 
/**
 * Handles close button click events.
 *
 * @private
 */
OO.ui.PopupWidget.prototype.onCloseButtonClick = function () {
	if ( this.isVisible() ) {
		this.toggle( false );
	}
};
 
/**
 * Unbind document mouse down listener.
 *
 * @private
 */
OO.ui.PopupWidget.prototype.unbindDocumentMouseDownListener = function () {
	this.getElementDocument().removeEventListener( 'mousedown', this.onDocumentMouseDownHandler, true );
	this.getElementDocument().removeEventListener( 'click', this.onDocumentMouseDownHandler, true );
};
 
/**
 * Handles document key down events.
 *
 * @private
 * @param {KeyboardEvent} e Key down event
 */
OO.ui.PopupWidget.prototype.onDocumentKeyDown = function ( e ) {
	if (
		e.which === OO.ui.Keys.ESCAPE &&
		this.isVisible()
	) {
		this.toggle( false );
		e.preventDefault();
		e.stopPropagation();
	}
};
 
/**
 * Bind document key down listener.
 *
 * @private
 */
OO.ui.PopupWidget.prototype.bindDocumentKeyDownListener = function () {
	this.getElementDocument().addEventListener( 'keydown', this.onDocumentKeyDownHandler, true );
};
 
/**
 * Unbind document key down listener.
 *
 * @private
 */
OO.ui.PopupWidget.prototype.unbindDocumentKeyDownListener = function () {
	this.getElementDocument().removeEventListener( 'keydown', this.onDocumentKeyDownHandler, true );
};
 
/**
 * Handles Tab key down events.
 *
 * @private
 * @param {KeyboardEvent} e Key down event
 */
OO.ui.PopupWidget.prototype.onTabKeyDown = function ( e ) {
	if ( !e.shiftKey && e.which === OO.ui.Keys.TAB ) {
		e.preventDefault();
		this.toggle( false );
	}
};
 
/**
 * Handles Shift + Tab key down events.
 *
 * @private
 * @param {KeyboardEvent} e Key down event
 */
OO.ui.PopupWidget.prototype.onShiftTabKeyDown = function ( e ) {
	if ( e.shiftKey && e.which === OO.ui.Keys.TAB ) {
		e.preventDefault();
		this.toggle( false );
	}
};
 
/**
 * Show, hide, or toggle the visibility of the anchor.
 *
 * @param {boolean} [show] Show anchor, omit to toggle
 */
OO.ui.PopupWidget.prototype.toggleAnchor = function ( show ) {
	show = show === undefined ? !this.anchored : !!show;
 
	Eif ( this.anchored !== show ) {
		Eif ( show ) {
			this.$element.addClass( 'oo-ui-popupWidget-anchored' );
			this.$element.addClass( 'oo-ui-popupWidget-anchored-' + this.anchorEdge );
		} else {
			this.$element.removeClass( 'oo-ui-popupWidget-anchored' );
			this.$element.removeClass( 'oo-ui-popupWidget-anchored-' + this.anchorEdge );
		}
		this.anchored = show;
	}
};
 
/**
 * Change which edge the anchor appears on.
 *
 * @param {string} edge 'top', 'bottom', 'start' or 'end'
 */
OO.ui.PopupWidget.prototype.setAnchorEdge = function ( edge ) {
	if ( [ 'top', 'bottom', 'start', 'end' ].indexOf( edge ) === -1 ) {
		throw new Error( 'Invalid value for edge: ' + edge );
	}
	if ( this.anchorEdge !== null ) {
		this.$element.removeClass( 'oo-ui-popupWidget-anchored-' + this.anchorEdge );
	}
	this.anchorEdge = edge;
	if ( this.anchored ) {
		this.$element.addClass( 'oo-ui-popupWidget-anchored-' + edge );
	}
};
 
/**
 * Check if the anchor is visible.
 *
 * @return {boolean} Anchor is visible
 */
OO.ui.PopupWidget.prototype.hasAnchor = function () {
	return this.anchored;
};
 
/**
 * Toggle visibility of the popup. The popup is initially hidden and must be shown by calling
 * `.toggle( true )` after its #$element is attached to the DOM.
 *
 * Do not show the popup while it is not attached to the DOM. The calculations required to display
 * it in the right place and with the right dimensions only work correctly while it is attached.
 * Side-effects may include broken interface and exceptions being thrown. This wasn't always
 * strictly enforced, so currently it only generates a warning in the browser console.
 *
 * @fires ready
 * @inheritdoc
 */
OO.ui.PopupWidget.prototype.toggle = function ( show ) {
	var change, normalHeight, oppositeHeight, normalWidth,
		oppositeWidth, $firstFocusableElement, $lastFocusableElement;
	show = show === undefined ? !this.isVisible() : !!show;
 
	change = show !== this.isVisible();
 
	if ( show && !this.warnedUnattached && !this.isElementAttached() ) {
		OO.ui.warnDeprecation( 'PopupWidget#toggle: Before calling this method, the popup must be attached to the DOM.' );
		this.warnedUnattached = true;
	}
	if ( show && !this.$floatableContainer && this.isElementAttached() ) {
		// Fall back to the parent node if the floatableContainer is not set
		this.setFloatableContainer( this.$element.parent() );
	}
 
	if ( change && show && this.autoFlip ) {
		// Reset auto-flipping before showing the popup again. It's possible we no longer need to
		// flip (e.g. if the user scrolled).
		this.isAutoFlipped = false;
	}
 
	// Parent method
	OO.ui.PopupWidget.super.prototype.toggle.call( this, show );
 
	if ( change ) {
		this.togglePositioning( show && !!this.$floatableContainer );
 
		// Find the first and last focusable element in the popup widget
		$lastFocusableElement = OO.ui.findFocusable( this.$element, true );
		$firstFocusableElement = OO.ui.findFocusable( this.$element, false );
 
		if ( show ) {
			if ( this.autoClose ) {
				this.bindDocumentMouseDownListener();
				this.bindDocumentKeyDownListener();
 
				// Bind a keydown event to the first and last focusable element
				// If user presses the tab key on this item, dismiss the popup and
				// take focus back to the caller, ideally the caller implements this functionality
				// This is to prevent illogical focus order, a common accessibility pitfall.
				// Alternative Fix: Implement focus trap for popup widget.
				$lastFocusableElement.on( 'keydown', this.onTabKeyDownHandler );
				$firstFocusableElement.on( 'keydown', this.onShiftTabKeyDownHandler );
			}
			this.updateDimensions();
			this.toggleClipping( true );
 
			if ( this.autoFlip ) {
				if ( this.popupPosition === 'above' || this.popupPosition === 'below' ) {
					if ( this.isClippedVertically() || this.isFloatableOutOfView() ) {
						// If opening the popup in the normal direction causes it to be clipped,
						// open in the opposite one instead
						normalHeight = this.$element.height();
						this.isAutoFlipped = !this.isAutoFlipped;
						this.position();
						if ( this.isClippedVertically() || this.isFloatableOutOfView() ) {
							// If that also causes it to be clipped, open in whichever direction
							// we have more space
							oppositeHeight = this.$element.height();
							if ( oppositeHeight < normalHeight ) {
								this.isAutoFlipped = !this.isAutoFlipped;
								this.position();
							}
						}
					}
				}
				if ( this.popupPosition === 'before' || this.popupPosition === 'after' ) {
					if ( this.isClippedHorizontally() || this.isFloatableOutOfView() ) {
						// If opening the popup in the normal direction causes it to be clipped,
						// open in the opposite one instead
						normalWidth = this.$element.width();
						this.isAutoFlipped = !this.isAutoFlipped;
						// Due to T180173 horizontally clipped PopupWidgets have messed up
						// dimensions, which causes positioning to be off. Toggle clipping back and
						// forth to work around.
						this.toggleClipping( false );
						this.position();
						this.toggleClipping( true );
						if ( this.isClippedHorizontally() || this.isFloatableOutOfView() ) {
							// If that also causes it to be clipped, open in whichever direction
							// we have more space
							oppositeWidth = this.$element.width();
							if ( oppositeWidth < normalWidth ) {
								this.isAutoFlipped = !this.isAutoFlipped;
								// Due to T180173, horizontally clipped PopupWidgets have messed up
								// dimensions, which causes positioning to be off. Toggle clipping
								// back and forth to work around.
								this.toggleClipping( false );
								this.position();
								this.toggleClipping( true );
							}
						}
					}
				}
			}
 
			this.emit( 'ready' );
		} else {
			this.toggleClipping( false );
			if ( this.autoClose ) {
				// Remove binded keydown event from the first and last focusable elements
				// when popup closes
				$lastFocusableElement.off( 'keydown', this.onTabKeyDownHandler );
				$firstFocusableElement.off( 'keydown', this.onShiftTabKeyDownHandler );
 
				this.unbindDocumentMouseDownListener();
				this.unbindDocumentKeyDownListener();
			}
 
			// This is so we can restore focus to the parent when the pop widget dismisses
			// Also, we're emitting an event
			// so we don't have to tie this implementation to the caller.
			// Let the caller handle this details.
			this.emit( 'closing' );
		}
	}
 
	return this;
};
 
/**
 * Set the size of the popup.
 *
 * Changing the size may also change the popup's position depending on the alignment.
 *
 * @param {number|null} [width=320] Width in pixels. Pass `null` to use automatic width.
 * @param {number|null} [height=null] Height in pixels. Pass `null` to use automatic height.
 * @param {boolean} [transition=false] Use a smooth transition
 * @chainable
 */
OO.ui.PopupWidget.prototype.setSize = function ( width, height, transition ) {
	this.width = width !== undefined ? width : 320;
	this.height = height !== undefined ? height : null;
	Eif ( this.isVisible() ) {
		this.updateDimensions( transition );
	}
};
 
/**
 * Update the size and position.
 *
 * Only use this to keep the popup properly anchored. Use #setSize to change the size, and this will
 * be called automatically.
 *
 * @param {boolean} [transition=false] Use a smooth transition
 * @chainable
 */
OO.ui.PopupWidget.prototype.updateDimensions = function ( transition ) {
	var widget = this;
 
	// Prevent transition from being interrupted
	clearTimeout( this.transitionTimeout );
	Iif ( transition ) {
		// Enable transition
		this.$element.addClass( 'oo-ui-popupWidget-transitioning' );
	}
 
	this.position();
 
	Iif ( transition ) {
		// Prevent transitioning after transition is complete
		this.transitionTimeout = setTimeout( function () {
			widget.$element.removeClass( 'oo-ui-popupWidget-transitioning' );
		}, 200 );
	} else {
		// Prevent transitioning immediately
		this.$element.removeClass( 'oo-ui-popupWidget-transitioning' );
	}
};
 
/**
 * @inheritdoc
 */
OO.ui.PopupWidget.prototype.computePosition = function () {
	var direction, align, vertical, start, end, near, far, sizeProp, popupSize, anchorSize,
		anchorPos, anchorOffset, anchorMargin, parentPosition, positionProp, positionAdjustment,
		floatablePos, offsetParentPos, containerPos, popupPosition, viewportSpacing,
		popupPos = {},
		anchorCss = { left: '', right: '', top: '', bottom: '' },
		popupPositionOppositeMap = {
			above: 'below',
			below: 'above',
			before: 'after',
			after: 'before'
		},
		alignMap = {
			ltr: {
				'force-left': 'backwards',
				'force-right': 'forwards'
			},
			rtl: {
				'force-left': 'forwards',
				'force-right': 'backwards'
			}
		},
		anchorEdgeMap = {
			above: 'bottom',
			below: 'top',
			before: 'end',
			after: 'start'
		},
		hPosMap = {
			forwards: 'start',
			center: 'center',
			backwards: this.anchored ? 'before' : 'end'
		},
		vPosMap = {
			forwards: 'top',
			center: 'center',
			backwards: 'bottom'
		};
 
	if ( !this.$container ) {
		// Lazy-initialize $container if not specified in constructor
		this.$container = $( this.getClosestScrollableElementContainer() );
	}
	direction = this.$container.css( 'direction' );
 
	// Set height and width before we do anything else, since it might cause our measurements
	// to change (e.g. due to scrollbars appearing or disappearing), and it also affects centering
	this.$popup.css( {
		width: this.width !== null ? this.width : 'auto',
		height: this.height !== null ? this.height : 'auto'
	} );
 
	align = alignMap[ direction ][ this.align ] || this.align;
	popupPosition = this.popupPosition;
	if ( this.isAutoFlipped ) {
		popupPosition = popupPositionOppositeMap[ popupPosition ];
	}
 
	// If the popup is positioned before or after, then the anchor positioning is vertical,
	// otherwise horizontal
	vertical = popupPosition === 'before' || popupPosition === 'after';
	start = vertical ? 'top' : ( direction === 'rtl' ? 'right' : 'left' );
	end = vertical ? 'bottom' : ( direction === 'rtl' ? 'left' : 'right' );
	near = vertical ? 'top' : 'left';
	far = vertical ? 'bottom' : 'right';
	sizeProp = vertical ? 'Height' : 'Width';
	popupSize = vertical ?
		( this.height || this.$popup.height() ) :
		( this.width || this.$popup.width() );
 
	this.setAnchorEdge( anchorEdgeMap[ popupPosition ] );
	this.horizontalPosition = vertical ? popupPosition : hPosMap[ align ];
	this.verticalPosition = vertical ? vPosMap[ align ] : popupPosition;
 
	// Parent method
	parentPosition = OO.ui.mixin.FloatableElement.prototype.computePosition.call( this );
	// Find out which property FloatableElement used for positioning, and adjust that value
	positionProp = vertical ?
		( parentPosition.top !== '' ? 'top' : 'bottom' ) :
		( parentPosition.left !== '' ? 'left' : 'right' );
 
	// Figure out where the near and far edges of the popup and $floatableContainer are
	floatablePos = this.$floatableContainer.offset();
	floatablePos[ far ] = floatablePos[ near ] + this.$floatableContainer[ 'outer' + sizeProp ]();
	// Measure where the offsetParent is and compute our position based on that and parentPosition
	offsetParentPos = this.$element.offsetParent()[ 0 ] === document.documentElement ?
		{ top: 0, left: 0 } :
		this.$element.offsetParent().offset();
 
	if ( positionProp === near ) {
		popupPos[ near ] = offsetParentPos[ near ] + parentPosition[ near ];
		popupPos[ far ] = popupPos[ near ] + popupSize;
	} else {
		popupPos[ far ] = offsetParentPos[ near ] +
			this.$element.offsetParent()[ 'inner' + sizeProp ]() - parentPosition[ far ];
		popupPos[ near ] = popupPos[ far ] - popupSize;
	}
 
	if ( this.anchored ) {
		// Position the anchor (which is positioned relative to the popup) to point to
		// $floatableContainer
		anchorPos = ( floatablePos[ start ] + floatablePos[ end ] ) / 2;
		anchorOffset = ( start === far ? -1 : 1 ) * ( anchorPos - popupPos[ start ] );
 
		// If the anchor is less than 2*anchorSize from either edge, move the popup to make more
		// space this.$anchor.width()/height() returns 0 because of the CSS trickery we use, so use
		// scrollWidth/Height
		anchorSize = this.$anchor[ 0 ][ 'scroll' + sizeProp ];
		anchorMargin = parseFloat( this.$anchor.css( 'margin-' + start ) );
		if ( anchorOffset + anchorMargin < 2 * anchorSize ) {
			// Not enough space for the anchor on the start side; pull the popup startwards
			positionAdjustment = ( positionProp === start ? -1 : 1 ) *
				( 2 * anchorSize - ( anchorOffset + anchorMargin ) );
		} else if ( anchorOffset + anchorMargin > popupSize - 2 * anchorSize ) {
			// Not enough space for the anchor on the end side; pull the popup endwards
			positionAdjustment = ( positionProp === end ? -1 : 1 ) *
				( anchorOffset + anchorMargin - ( popupSize - 2 * anchorSize ) );
		} else {
			positionAdjustment = 0;
		}
	} else {
		positionAdjustment = 0;
	}
 
	// Check if the popup will go beyond the edge of this.$container
	containerPos = this.$container[ 0 ] === document.documentElement ?
		{ top: 0, left: 0 } :
		this.$container.offset();
	containerPos[ far ] = containerPos[ near ] + this.$container[ 'inner' + sizeProp ]();
	if ( this.$container[ 0 ] === document.documentElement ) {
		viewportSpacing = OO.ui.getViewportSpacing();
		containerPos[ near ] += viewportSpacing[ near ];
		containerPos[ far ] -= viewportSpacing[ far ];
	}
	// Take into account how much the popup will move because of the adjustments we're going to make
	popupPos[ near ] += ( positionProp === near ? 1 : -1 ) * positionAdjustment;
	popupPos[ far ] += ( positionProp === near ? 1 : -1 ) * positionAdjustment;
	if ( containerPos[ near ] + this.containerPadding > popupPos[ near ] ) {
		// Popup goes beyond the near (left/top) edge, move it to the right/bottom
		positionAdjustment += ( positionProp === near ? 1 : -1 ) *
			( containerPos[ near ] + this.containerPadding - popupPos[ near ] );
	} else if ( containerPos[ far ] - this.containerPadding < popupPos[ far ] ) {
		// Popup goes beyond the far (right/bottom) edge, move it to the left/top
		positionAdjustment += ( positionProp === far ? 1 : -1 ) *
			( popupPos[ far ] - ( containerPos[ far ] - this.containerPadding ) );
	}
 
	if ( this.anchored ) {
		// Adjust anchorOffset for positionAdjustment
		anchorOffset += ( positionProp === start ? -1 : 1 ) * positionAdjustment;
 
		// Position the anchor
		anchorCss[ start ] = anchorOffset;
		this.$anchor.css( anchorCss );
	}
 
	// Move the popup if needed
	parentPosition[ positionProp ] += positionAdjustment;
 
	return parentPosition;
};
 
/**
 * Set popup alignment
 *
 * @param {string} [align=center] Alignment of the popup, `center`, `force-left`, `force-right`,
 *  `backwards` or `forwards`.
 */
OO.ui.PopupWidget.prototype.setAlignment = function ( align ) {
	// Validate alignment
	Eif ( [ 'force-left', 'force-right', 'backwards', 'forwards', 'center' ].indexOf( align ) > -1 ) {
		this.align = align;
	} else {
		this.align = 'center';
	}
	this.position();
};
 
/**
 * Get popup alignment
 *
 * @return {string} Alignment of the popup, `center`, `force-left`, `force-right`,
 *  `backwards` or `forwards`.
 */
OO.ui.PopupWidget.prototype.getAlignment = function () {
	return this.align;
};
 
/**
 * Change the positioning of the popup.
 *
 * @param {string} position 'above', 'below', 'before' or 'after'
 */
OO.ui.PopupWidget.prototype.setPosition = function ( position ) {
	Iif ( [ 'above', 'below', 'before', 'after' ].indexOf( position ) === -1 ) {
		position = 'below';
	}
	this.popupPosition = position;
	this.position();
};
 
/**
 * Get popup positioning.
 *
 * @return {string} 'above', 'below', 'before' or 'after'
 */
OO.ui.PopupWidget.prototype.getPosition = function () {
	return this.popupPosition;
};
 
/**
 * Set popup auto-flipping.
 *
 * @param {boolean} autoFlip Whether to automatically switch the popup's position between
 *  'above' and 'below', or between 'before' and 'after', if there is not enough space in the
 *  desired direction to display the popup without clipping
 */
OO.ui.PopupWidget.prototype.setAutoFlip = function ( autoFlip ) {
	autoFlip = !!autoFlip;
 
	Eif ( this.autoFlip !== autoFlip ) {
		this.autoFlip = autoFlip;
	}
};
 
/**
 * Set which elements will not close the popup when clicked.
 *
 * For auto-closing popups, clicks on these elements will not cause the popup to auto-close.
 *
 * @param {jQuery} $autoCloseIgnore Elements to ignore for auto-closing
 */
OO.ui.PopupWidget.prototype.setAutoCloseIgnore = function ( $autoCloseIgnore ) {
	this.$autoCloseIgnore = $autoCloseIgnore;
};
 
/**
 * Get an ID of the body element, this can be used as the
 * `aria-describedby` attribute for an input field.
 *
 * @return {string} The ID of the body element
 */
OO.ui.PopupWidget.prototype.getBodyId = function () {
	var id = this.$body.attr( 'id' );
	Eif ( id === undefined ) {
		id = OO.ui.generateElementId();
		this.$body.attr( 'id', id );
	}
	return id;
};