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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @fileoverview This file provides utility functions for position popups.
*/
cr.define('cr.ui', function() {
/**
* Type def for rects as returned by getBoundingClientRect.
* @typedef { {left: number, top: number, width: number, height: number,
* right: number, bottom: number}}
*/
var Rect;
/**
* Enum for defining how to anchor a popup to an anchor element.
* @enum {number}
*/
const AnchorType = {
/**
* The popup's right edge is aligned with the left edge of the anchor.
* The popup's top edge is aligned with the top edge of the anchor.
*/
BEFORE: 1, // p: right, a: left, p: top, a: top
/**
* The popop's left edge is aligned with the right edge of the anchor.
* The popup's top edge is aligned with the top edge of the anchor.
*/
AFTER: 2, // p: left a: right, p: top, a: top
/**
* The popop's bottom edge is aligned with the top edge of the anchor.
* The popup's left edge is aligned with the left edge of the anchor.
*/
ABOVE: 3, // p: bottom, a: top, p: left, a: left
/**
* The popop's top edge is aligned with the bottom edge of the anchor.
* The popup's left edge is aligned with the left edge of the anchor.
*/
BELOW: 4 // p: top, a: bottom, p: left, a: left
};
/**
* Helper function for positionPopupAroundElement and positionPopupAroundRect.
* @param {!Rect} anchorRect The rect for the anchor.
* @param {!HTMLElement} popupElement The element used for the popup.
* @param {AnchorType} type The type of anchoring to do.
* @param {boolean} invertLeftRight Whether to invert the right/left
* alignment.
*/
function positionPopupAroundRect(anchorRect, popupElement, type,
invertLeftRight) {
var popupRect = popupElement.getBoundingClientRect();
var availRect;
var ownerDoc = popupElement.ownerDocument;
var cs = ownerDoc.defaultView.getComputedStyle(popupElement);
var docElement = ownerDoc.documentElement;
if (cs.position == 'fixed') {
// For 'fixed' positioned popups, the available rectangle should be based
// on the viewport rather than the document.
availRect = {
height: docElement.clientHeight,
width: docElement.clientWidth,
top: 0,
bottom: docElement.clientHeight,
left: 0,
right: docElement.clientWidth
};
} else {
availRect = popupElement.offsetParent.getBoundingClientRect();
}
if (cs.direction == 'rtl')
invertLeftRight = !invertLeftRight;
// Flip BEFORE, AFTER based on alignment.
if (invertLeftRight) {
if (type == AnchorType.BEFORE)
type = AnchorType.AFTER;
else if (type == AnchorType.AFTER)
type = AnchorType.BEFORE;
}
// Flip type based on available size
switch (type) {
case AnchorType.BELOW:
if (anchorRect.bottom + popupRect.height > availRect.height &&
popupRect.height <= anchorRect.top) {
type = AnchorType.ABOVE;
}
break;
case AnchorType.ABOVE:
if (popupRect.height > anchorRect.top &&
anchorRect.bottom + popupRect.height <= availRect.height) {
type = AnchorType.BELOW;
}
break;
case AnchorType.AFTER:
if (anchorRect.right + popupRect.width > availRect.width &&
popupRect.width <= anchorRect.left) {
type = AnchorType.BEFORE;
}
break;
case AnchorType.BEFORE:
if (popupRect.width > anchorRect.left &&
anchorRect.right + popupRect.width <= availRect.width) {
type = AnchorType.AFTER;
}
break;
}
// flipping done
var style = popupElement.style;
// Reset all directions.
style.left = style.right = style.top = style.bottom = 'auto'
// Primary direction
switch (type) {
case AnchorType.BELOW:
if (anchorRect.bottom + popupRect.height <= availRect.height)
style.top = anchorRect.bottom + 'px';
else
style.bottom = '0';
break;
case AnchorType.ABOVE:
if (availRect.height - anchorRect.top >= 0)
style.bottom = availRect.height - anchorRect.top + 'px';
else
style.top = '0';
break;
case AnchorType.AFTER:
if (anchorRect.right + popupRect.width <= availRect.width)
style.left = anchorRect.right + 'px';
else
style.right = '0';
break;
case AnchorType.BEFORE:
if (availRect.width - anchorRect.left >= 0)
style.right = availRect.width - anchorRect.left + 'px';
else
style.left = '0';
break;
}
// Secondary direction
switch (type) {
case AnchorType.BELOW:
case AnchorType.ABOVE:
if (invertLeftRight) {
// align right edges
if (anchorRect.right - popupRect.width >= 0) {
style.right = availRect.width - anchorRect.right + 'px';
// align left edges
} else if (anchorRect.left + popupRect.width <= availRect.width) {
style.left = anchorRect.left + 'px';
// not enough room on either side
} else {
style.right = '0';
}
} else {
// align left edges
if (anchorRect.left + popupRect.width <= availRect.width) {
style.left = anchorRect.left + 'px';
// align right edges
} else if (anchorRect.right - popupRect.width >= 0) {
style.right = availRect.width - anchorRect.right + 'px';
// not enough room on either side
} else {
style.left = '0';
}
}
break;
case AnchorType.AFTER:
case AnchorType.BEFORE:
// align top edges
if (anchorRect.top + popupRect.height <= availRect.height) {
style.top = anchorRect.top + 'px';
// align bottom edges
} else if (anchorRect.bottom - popupRect.height >= 0) {
style.bottom = availRect.height - anchorRect.bottom + 'px';
// not enough room on either side
} else {
style.top = '0';
}
break;
}
}
/**
* Positions a popup element relative to an anchor element. The popup element
* should have position set to absolute and it should be a child of the body
* element.
* @param {!HTMLElement} anchorElement The element that the popup is anchored
* to.
* @param {!HTMLElement} popupElement The popup element we are positioning.
* @param {AnchorType} type The type of anchoring we want.
* @param {boolean} invertLeftRight Whether to invert the right/left
* alignment.
*/
function positionPopupAroundElement(anchorElement, popupElement, type,
invertLeftRight) {
var anchorRect = anchorElement.getBoundingClientRect();
positionPopupAroundRect(anchorRect, popupElement, type, invertLeftRight);
}
/**
* Positions a popup around a point.
* @param {number} x The client x position.
* @param {number} y The client y position.
* @param {!HTMLElement} popupElement The popup element we are positioning.
*/
function positionPopupAtPoint(x, y, popupElement) {
var rect = {
left: x,
top: y,
width: 0,
height: 0,
right: x,
bottom: y
};
positionPopupAroundRect(rect, popupElement, AnchorType.BELOW);
}
// Export
return {
AnchorType: AnchorType,
positionPopupAroundElement: positionPopupAroundElement,
positionPopupAtPoint: positionPopupAtPoint
};
});
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