// Copyright 2006 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview Common positioning code.
*
* @author [email protected] (Emil A Eklund)
*/
goog.provide('goog.positioning');
goog.provide('goog.positioning.Corner');
goog.provide('goog.positioning.CornerBit');
goog.provide('goog.positioning.Overflow');
goog.provide('goog.positioning.OverflowStatus');
goog.require('goog.asserts');
goog.require('goog.dom');
goog.require('goog.dom.TagName');
goog.require('goog.math.Coordinate');
goog.require('goog.math.Rect');
goog.require('goog.math.Size');
goog.require('goog.style');
goog.require('goog.style.bidi');
/**
* Enum for representing an element corner for positioning the popup.
*
* The START constants map to LEFT if element directionality is left
* to right and RIGHT if the directionality is right to left.
* Likewise END maps to RIGHT or LEFT depending on the directionality.
*
* @enum {number}
*/
goog.positioning.Corner = {
TOP_LEFT: 0,
TOP_RIGHT: 2,
BOTTOM_LEFT: 1,
BOTTOM_RIGHT: 3,
TOP_START: 4,
TOP_END: 6,
BOTTOM_START: 5,
BOTTOM_END: 7
};
/**
* Enum for bits in the {@see goog.positioning.Corner) bitmap.
*
* @enum {number}
*/
goog.positioning.CornerBit = {
BOTTOM: 1,
RIGHT: 2,
FLIP_RTL: 4
};
/**
* Enum for representing position handling in cases where the element would be
* positioned outside the viewport.
*
* @enum {number}
*/
goog.positioning.Overflow = {
/** Ignore overflow */
IGNORE: 0,
/** Try to fit horizontally in the viewport at all costs. */
ADJUST_X: 1,
/** If the element can't fit horizontally, report positioning failure. */
FAIL_X: 2,
/** Try to fit vertically in the viewport at all costs. */
ADJUST_Y: 4,
/** If the element can't fit vertically, report positioning failure. */
FAIL_Y: 8,
/** Resize the element's width to fit in the viewport. */
RESIZE_WIDTH: 16,
/** Resize the element's height to fit in the viewport. */
RESIZE_HEIGHT: 32,
/**
* If the anchor goes off-screen in the x-direction, position the movable
* element off-screen. Otherwise, try to fit horizontally in the viewport.
*/
ADJUST_X_EXCEPT_OFFSCREEN: 64 | 1,
/**
* If the anchor goes off-screen in the y-direction, position the movable
* element off-screen. Otherwise, try to fit vertically in the viewport.
*/
ADJUST_Y_EXCEPT_OFFSCREEN: 128 | 4
};
/**
* Enum for representing the outcome of a positioning call.
*
* @enum {number}
*/
goog.positioning.OverflowStatus = {
NONE: 0,
ADJUSTED_X: 1,
ADJUSTED_Y: 2,
WIDTH_ADJUSTED: 4,
HEIGHT_ADJUSTED: 8,
FAILED_LEFT: 16,
FAILED_RIGHT: 32,
FAILED_TOP: 64,
FAILED_BOTTOM: 128,
FAILED_OUTSIDE_VIEWPORT: 256
};
/**
* Shorthand to check if a status code contains any fail code.
* @type {number}
*/
goog.positioning.OverflowStatus.FAILED =
goog.positioning.OverflowStatus.FAILED_LEFT |
goog.positioning.OverflowStatus.FAILED_RIGHT |
goog.positioning.OverflowStatus.FAILED_TOP |
goog.positioning.OverflowStatus.FAILED_BOTTOM |
goog.positioning.OverflowStatus.FAILED_OUTSIDE_VIEWPORT;
/**
* Shorthand to check if horizontal positioning failed.
* @type {number}
*/
goog.positioning.OverflowStatus.FAILED_HORIZONTAL =
goog.positioning.OverflowStatus.FAILED_LEFT |
goog.positioning.OverflowStatus.FAILED_RIGHT;
/**
* Shorthand to check if vertical positioning failed.
* @type {number}
*/
goog.positioning.OverflowStatus.FAILED_VERTICAL =
goog.positioning.OverflowStatus.FAILED_TOP |
goog.positioning.OverflowStatus.FAILED_BOTTOM;
/**
* Positions a movable element relative to an anchor element. The caller
* specifies the corners that should touch. This functions then moves the
* movable element accordingly.
*
* @param {Element} anchorElement The element that is the anchor for where
* the movable element should position itself.
* @param {goog.positioning.Corner} anchorElementCorner The corner of the
* anchorElement for positioning the movable element.
* @param {Element} movableElement The element to move.
* @param {goog.positioning.Corner} movableElementCorner The corner of the
* movableElement that that should be positioned adjacent to the anchor
* element.
* @param {goog.math.Coordinate=} opt_offset An offset specified in pixels.
* After the normal positioning algorithm is applied, the offset is then
* applied. Positive coordinates move the popup closer to the center of the
* anchor element. Negative coordinates move the popup away from the center
* of the anchor element.
* @param {goog.math.Box=} opt_margin A margin specified in pixels.
* After the normal positioning algorithm is applied and any offset, the
* margin is then applied. Positive coordinates move the popup away from the
* spot it was positioned towards its center. Negative coordinates move it
* towards the spot it was positioned away from its center.
* @param {?number=} opt_overflow Overflow handling mode. Defaults to IGNORE if
* not specified. Bitmap, {@see goog.positioning.Overflow}.
* @param {goog.math.Size=} opt_preferredSize The preferred size of the
* movableElement.
* @param {goog.math.Box=} opt_viewport Box object describing the dimensions of
* the viewport. The viewport is specified relative to offsetParent of
* {@code movableElement}. In other words, the viewport can be thought of as
* describing a "position: absolute" element contained in the offsetParent.
* It defaults to visible area of nearest scrollable ancestor of
* {@code movableElement} (see {@code goog.style.getVisibleRectForElement}).
* @return {goog.positioning.OverflowStatus} Status bitmap,
* {@see goog.positioning.OverflowStatus}.
*/
goog.positioning.positionAtAnchor = function(anchorElement,
anchorElementCorner,
movableElement,
movableElementCorner,
opt_offset,
opt_margin,
opt_overflow,
opt_preferredSize,
opt_viewport) {
goog.asserts.assert(movableElement);
var movableParentTopLeft =
goog.positioning.getOffsetParentPageOffset(movableElement);
// Get the visible part of the anchor element. anchorRect is
// relative to anchorElement's page.
var anchorRect = goog.positioning.getVisiblePart_(anchorElement);
// Translate anchorRect to be relative to movableElement's page.
goog.style.translateRectForAnotherFrame(
anchorRect,
goog.dom.getDomHelper(anchorElement),
goog.dom.getDomHelper(movableElement));
// Offset based on which corner of the element we want to position against.
var corner = goog.positioning.getEffectiveCorner(anchorElement,
anchorElementCorner);
// absolutePos is a candidate position relative to the
// movableElement's window.
var absolutePos = new goog.math.Coordinate(
corner & goog.positioning.CornerBit.RIGHT ?
anchorRect.left + anchorRect.width : anchorRect.left,
corner & goog.positioning.CornerBit.BOTTOM ?
anchorRect.top + anchorRect.height : anchorRect.top);
// Translate absolutePos to be relative to the offsetParent.
absolutePos =
goog.math.Coordinate.difference(absolutePos, movableParentTopLeft);
// Apply offset, if specified
if (opt_offset) {
absolutePos.x += (corner & goog.positioning.CornerBit.RIGHT ? -1 : 1) *
opt_offset.x;
absolutePos.y += (corner & goog.positioning.CornerBit.BOTTOM ? -1 : 1) *
opt_offset.y;
}
// Determine dimension of viewport.
var viewport;
if (opt_overflow) {
if (opt_viewport) {
viewport = opt_viewport;
} else {
viewport = goog.style.getVisibleRectForElement(movableElement);
if (viewport) {
viewport.top -= movableParentTopLeft.y;
viewport.right -= movableParentTopLeft.x;
viewport.bottom -= movableParentTopLeft.y;
viewport.left -= movableParentTopLeft.x;
}
}
}
return goog.positioning.positionAtCoordinate(absolutePos,
movableElement,
movableElementCorner,
opt_margin,
viewport,
opt_overflow,
opt_preferredSize);
};
/**
* Calculates the page offset of the given element's
* offsetParent. This value can be used to translate any x- and
* y-offset relative to the page to an offset relative to the
* offsetParent, which can then be used directly with as position
* coordinate for {@code positionWithCoordinate}.
* @param {!Element} movableElement The element to calculate.
* @return {!goog.math.Coordinate} The page offset, may be (0, 0).
*/
goog.positioning.getOffsetParentPageOffset = function(movableElement) {
// Ignore offset for the BODY element unless its position is non-static.
// For cases where the offset parent is HTML rather than the BODY (such as in
// IE strict mode) there's no need to get the position of the BODY as it
// doesn't affect the page offset.
var movableParentTopLeft;
var parent = movableElement.offsetParent;
if (parent) {
var isBody = parent.tagName == goog.dom.TagName.HTML ||
parent.tagName == goog.dom.TagName.BODY;
if (!isBody ||
goog.style.getComputedPosition(parent) != 'static') {
// Get the top-left corner of the parent, in page coordinates.
movableParentTopLeft = goog.style.getPageOffset(parent);
if (!isBody) {
movableParentTopLeft = goog.math.Coordinate.difference(
movableParentTopLeft,
new goog.math.Coordinate(goog.style.bidi.getScrollLeft(parent),
parent.scrollTop));
}
}
}
return movableParentTopLeft || new goog.math.Coordinate();
};
/**
* Returns intersection of the specified element and
* goog.style.getVisibleRectForElement for it.
*
* @param {Element} el The target element.
* @return {!goog.math.Rect} Intersection of getVisibleRectForElement
* and the current bounding rectangle of the element. If the
* intersection is empty, returns the bounding rectangle.
* @private
*/
goog.positioning.getVisiblePart_ = function(el) {
var rect = goog.style.getBounds(el);
var visibleBox = goog.style.getVisibleRectForElement(el);
if (visibleBox) {
rect.intersection(goog.math.Rect.createFromBox(visibleBox));
}
return rect;
};
/**
* Positions the specified corner of the movable element at the
* specified coordinate.
*
* @param {goog.math.Coordinate} absolutePos The coordinate to position the
* element at.
* @param {Element} movableElement The element to be positioned.
* @param {goog.positioning.Corner} movableElementCorner The corner of the
* movableElement that that should be positioned.
* @param {goog.math.Box=} opt_margin A margin specified in pixels.
* After the normal positioning algorithm is applied and any offset, the
* margin is then applied. Positive coordinates move the popup away from the
* spot it was positioned towards its center. Negative coordinates move it
* towards the spot it was positioned away from its center.
* @param {goog.math.Box=} opt_viewport Box object describing the dimensions of
* the viewport. Required if opt_overflow is specified.
* @param {?number=} opt_overflow Overflow handling mode. Defaults to IGNORE if
* not specified, {@see goog.positioning.Overflow}.
* @param {goog.math.Size=} opt_preferredSize The preferred size of the
* movableElement. Defaults to the current size.
* @return {goog.positioning.OverflowStatus} Status bitmap.
*/
goog.positioning.positionAtCoordinate = function(absolutePos,
movableElement,
movableElementCorner,
opt_margin,
opt_viewport,
opt_overflow,
opt_preferredSize) {
absolutePos = absolutePos.clone();
// Offset based on attached corner and desired margin.
var corner = goog.positioning.getEffectiveCorner(movableElement,
movableElementCorner);
var elementSize = goog.style.getSize(movableElement);
var size = opt_preferredSize ? opt_preferredSize.clone() :
elementSize.clone();
var positionResult = goog.positioning.getPositionAtCoordinate(absolutePos,
size, corner, opt_margin, opt_viewport, opt_overflow);
if (positionResult.status & goog.positioning.OverflowStatus.FAILED) {
return positionResult.status;
}
goog.style.setPosition(movableElement, positionResult.rect.getTopLeft());
size = positionResult.rect.getSize();
if (!goog.math.Size.equals(elementSize, size)) {
goog.style.setBorderBoxSize(movableElement, size);
}
return positionResult.status;
};
/**
* Computes the position for an element to be placed on-screen at the
* specified coordinates. Returns an object containing both the resulting
* rectangle, and the overflow status bitmap.
*
* @param {!goog.math.Coordinate} absolutePos The coordinate to position the
* element at.
* @param {!goog.math.Size} elementSize The size of the element to be
* positioned.
* @param {goog.positioning.Corner} elementCorner The corner of the
* movableElement that that should be positioned.
* @param {goog.math.Box=} opt_margin A margin specified in pixels.
* After the normal positioning algorithm is applied and any offset, the
* margin is then applied. Positive coordinates move the popup away from the
* spot it was positioned towards its center. Negative coordinates move it
* towards the spot it was positioned away from its center.
* @param {goog.math.Box=} opt_viewport Box object describing the dimensions of
* the viewport. Required if opt_overflow is specified.
* @param {?number=} opt_overflow Overflow handling mode. Defaults to IGNORE
* if not specified, {@see goog.positioning.Overflow}.
* @return {{rect:!goog.math.Rect, status:goog.positioning.OverflowStatus}}
* Object containing the computed position and status bitmap.
*/
goog.positioning.getPositionAtCoordinate = function(
absolutePos,
elementSize,
elementCorner,
opt_margin,
opt_viewport,
opt_overflow) {
absolutePos = absolutePos.clone();
elementSize = elementSize.clone();
var status = goog.positioning.OverflowStatus.NONE;
if (opt_margin || elementCorner != goog.positioning.Corner.TOP_LEFT) {
if (elementCorner & goog.positioning.CornerBit.RIGHT) {
absolutePos.x -= elementSize.width + (opt_margin ? opt_margin.right : 0);
} else if (opt_margin) {
absolutePos.x += opt_margin.left;
}
if (elementCorner & goog.positioning.CornerBit.BOTTOM) {
absolutePos.y -= elementSize.height +
(opt_margin ? opt_margin.bottom : 0);
} else if (opt_margin) {
absolutePos.y += opt_margin.top;
}
}
// Adjust position to fit inside viewport.
if (opt_overflow) {
status = opt_viewport ?
goog.positioning.adjustForViewport_(
absolutePos, elementSize, opt_viewport, opt_overflow) :
goog.positioning.OverflowStatus.FAILED_OUTSIDE_VIEWPORT;
}
var rect = new goog.math.Rect(0, 0, 0, 0);
rect.left = absolutePos.x;
rect.top = absolutePos.y;
rect.width = elementSize.width;
rect.height = elementSize.height;
return {rect: rect, status: status};
};
/**
* Adjusts the position and/or size of an element, identified by its position
* and size, to fit inside the viewport. If the position or size of the element
* is adjusted the pos or size objects, respectively, are modified.
*
* @param {goog.math.Coordinate} pos Position of element, updated if the
* position is adjusted.
* @param {goog.math.Size} size Size of element, updated if the size is
* adjusted.
* @param {goog.math.Box} viewport Bounding box describing the viewport.
* @param {number} overflow Overflow handling mode,
* {@see goog.positioning.Overflow}.
* @return {goog.positioning.OverflowStatus} Status bitmap,
* {@see goog.positioning.OverflowStatus}.
* @private
*/
goog.positioning.adjustForViewport_ = function(pos, size, viewport, overflow) {
var status = goog.positioning.OverflowStatus.NONE;
var ADJUST_X_EXCEPT_OFFSCREEN =
goog.positioning.Overflow.ADJUST_X_EXCEPT_OFFSCREEN;
var ADJUST_Y_EXCEPT_OFFSCREEN =
goog.positioning.Overflow.ADJUST_Y_EXCEPT_OFFSCREEN;
if ((overflow & ADJUST_X_EXCEPT_OFFSCREEN) == ADJUST_X_EXCEPT_OFFSCREEN &&
(pos.x < viewport.left || pos.x >= viewport.right)) {
overflow &= ~goog.positioning.Overflow.ADJUST_X;
}
if ((overflow & ADJUST_Y_EXCEPT_OFFSCREEN) == ADJUST_Y_EXCEPT_OFFSCREEN &&
(pos.y < viewport.top || pos.y >= viewport.bottom)) {
overflow &= ~goog.positioning.Overflow.ADJUST_Y;
}
// Left edge outside viewport, try to move it.
if (pos.x < viewport.left && overflow & goog.positioning.Overflow.ADJUST_X) {
pos.x = viewport.left;
status |= goog.positioning.OverflowStatus.ADJUSTED_X;
}
// Ensure object is inside the viewport width if required.
if (overflow & goog.positioning.Overflow.RESIZE_WIDTH) {
// Move left edge inside viewport.
var originalX = pos.x;
if (pos.x < viewport.left) {
pos.x = viewport.left;
status |= goog.positioning.OverflowStatus.WIDTH_ADJUSTED;
}
// Shrink width to inside right of viewport.
if (pos.x + size.width > viewport.right) {
// Set the width to be either the new maximum width within the viewport
// or the width originally within the viewport, whichever is less.
size.width = Math.min(
viewport.right - pos.x, originalX + size.width - viewport.left);
size.width = Math.max(size.width, 0);
status |= goog.positioning.OverflowStatus.WIDTH_ADJUSTED;
}
}
// Right edge outside viewport, try to move it.
if (pos.x + size.width > viewport.right &&
overflow & goog.positioning.Overflow.ADJUST_X) {
pos.x = Math.max(viewport.right - size.width, viewport.left);
status |= goog.positioning.OverflowStatus.ADJUSTED_X;
}
// Left or right edge still outside viewport, fail if the FAIL_X option was
// specified, ignore it otherwise.
if (overflow & goog.positioning.Overflow.FAIL_X) {
status |= (pos.x < viewport.left ?
goog.positioning.OverflowStatus.FAILED_LEFT : 0) |
(pos.x + size.width > viewport.right ?
goog.positioning.OverflowStatus.FAILED_RIGHT : 0);
}
// Top edge outside viewport, try to move it.
if (pos.y < viewport.top && overflow & goog.positioning.Overflow.ADJUST_Y) {
pos.y = viewport.top;
status |= goog.positioning.OverflowStatus.ADJUSTED_Y;
}
// Ensure object is inside the viewport height if required.
if (overflow & goog.positioning.Overflow.RESIZE_HEIGHT) {
// Move top edge inside viewport.
var originalY = pos.y;
if (pos.y < viewport.top) {
pos.y = viewport.top;
status |= goog.positioning.OverflowStatus.HEIGHT_ADJUSTED;
}
// Shrink height to inside bottom of viewport.
if (pos.y + size.height > viewport.bottom) {
// Set the height to be either the new maximum height within the viewport
// or the height originally within the viewport, whichever is less.
size.height = Math.min(
viewport.bottom - pos.y, originalY + size.height - viewport.top);
size.height = Math.max(size.height, 0);
status |= goog.positioning.OverflowStatus.HEIGHT_ADJUSTED;
}
}
// Bottom edge outside viewport, try to move it.
if (pos.y + size.height > viewport.bottom &&
overflow & goog.positioning.Overflow.ADJUST_Y) {
pos.y = Math.max(viewport.bottom - size.height, viewport.top);
status |= goog.positioning.OverflowStatus.ADJUSTED_Y;
}
// Top or bottom edge still outside viewport, fail if the FAIL_Y option was
// specified, ignore it otherwise.
if (overflow & goog.positioning.Overflow.FAIL_Y) {
status |= (pos.y < viewport.top ?
goog.positioning.OverflowStatus.FAILED_TOP : 0) |
(pos.y + size.height > viewport.bottom ?
goog.positioning.OverflowStatus.FAILED_BOTTOM : 0);
}
return status;
};
/**
* Returns an absolute corner (top/bottom left/right) given an absolute
* or relative (top/bottom start/end) corner and the direction of an element.
* Absolute corners remain unchanged.
* @param {Element} element DOM element to test for RTL direction.
* @param {goog.positioning.Corner} corner The popup corner used for
* positioning.
* @return {goog.positioning.Corner} Effective corner.
*/
goog.positioning.getEffectiveCorner = function(element, corner) {
return /** @type {goog.positioning.Corner} */ (
(corner & goog.positioning.CornerBit.FLIP_RTL &&
goog.style.isRightToLeft(element) ?
corner ^ goog.positioning.CornerBit.RIGHT :
corner
) & ~goog.positioning.CornerBit.FLIP_RTL);
};
/**
* Returns the corner opposite the given one horizontally.
* @param {goog.positioning.Corner} corner The popup corner used to flip.
* @return {goog.positioning.Corner} The opposite corner horizontally.
*/
goog.positioning.flipCornerHorizontal = function(corner) {
return /** @type {goog.positioning.Corner} */ (corner ^
goog.positioning.CornerBit.RIGHT);
};
/**
* Returns the corner opposite the given one vertically.
* @param {goog.positioning.Corner} corner The popup corner used to flip.
* @return {goog.positioning.Corner} The opposite corner vertically.
*/
goog.positioning.flipCornerVertical = function(corner) {
return /** @type {goog.positioning.Corner} */ (corner ^
goog.positioning.CornerBit.BOTTOM);
};
/**
* Returns the corner opposite the given one horizontally and vertically.
* @param {goog.positioning.Corner} corner The popup corner used to flip.
* @return {goog.positioning.Corner} The opposite corner horizontally and
* vertically.
*/
goog.positioning.flipCorner = function(corner) {
return /** @type {goog.positioning.Corner} */ (corner ^
goog.positioning.CornerBit.BOTTOM ^
goog.positioning.CornerBit.RIGHT);
};
Codebase Browser
chromium