mediawiki-extensions-Visual.../modules/rangy/rangy-position.js

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/**
* Position module for Rangy.
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* Extensions to Range and Selection objects to provide access to pixel positions relative to the viewport or document.
*
* Part of Rangy, a cross-browser JavaScript range and selection library
* http://code.google.com/p/rangy/
*
* Depends on Rangy core.
*
* Copyright 2013, Tim Down
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* Licensed under the MIT license.
* Version: 1.3alpha.772
* Build date: 26 February 2013
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*/
rangy.createModule("Position", function(api, module) {
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api.requireModules( ["WrappedSelection", "WrappedRange"] );
//var log = log4javascript.getLogger("rangy.position");
var NUMBER = "number", UNDEF = "undefined";
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var WrappedRange = api.WrappedRange;
var dom = api.dom, util = api.util, DomPosition = dom.DomPosition;
// Feature detection
//var caretPositionFromPointSupported = (typeof document.caretPositionFromPoint != UNDEF);
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// Since Rangy can deal with multiple documents which could be in different modes, we have to do the checks every
// time, unless we cache a getScrollPosition function in each document. This would necessarily pollute the
// document's global namespace, which I'm choosing to view as a greater evil than a slight performance hit.
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function getScrollPosition(win) {
var x = 0, y = 0;
if (typeof win.pageXOffset == NUMBER && typeof win.pageYOffset == NUMBER) {
x = win.pageXOffset;
y = win.pageYOffset;
} else {
var doc = win.document;
var docEl = doc.documentElement;
var compatMode = doc.compatMode;
var scrollEl = (typeof compatMode == "string" && compatMode.indexOf("CSS") >= 0 && docEl)
? docEl : dom.getBody(doc);
if (scrollEl && typeof scrollEl.scrollLeft == NUMBER && typeof scrollEl.scrollTop == NUMBER) {
try {
x = scrollEl.scrollLeft;
y = scrollEl.scrollTop;
} catch (ex) {}
}
}
return { x: x, y: y };
}
function getAncestorElement(node, tagName) {
tagName = tagName.toLowerCase();
while (node) {
if (node.nodeType == 1 && node.tagName.toLowerCase() == tagName) {
return node;
}
node = node.parentNode;
}
return null;
}
function Rect(top, right, bottom, left) {
this.top = top;
this.right = right;
this.bottom = bottom;
this.left = left;
this.width = right - left;
this.height = bottom - top;
}
function createRelativeRect(rect, dx, dy) {
return new Rect(rect.top + dy, rect.right + dx, rect.bottom + dy, rect.left + dx);
}
function adjustClientRect(rect, doc) {
// Older IEs have an issue with a two pixel margin on the body element
var dx = 0, dy = 0;
var docEl = doc.documentElement, body = dom.getBody(doc);
var container = (docEl.clientWidth === 0 && typeof body.clientTop == NUMBER) ? body : docEl;
var clientLeft = container.clientLeft, clientTop = container.clientTop;
if (clientLeft) {
dx = -clientLeft;
}
if (clientTop) {
dy = -clientTop;
}
return createRelativeRect(rect, dx, dy);
}
function mergeRects(rects) {
var tops = [], bottoms = [], lefts = [], rights = [];
for (var i = 0, len = rects.length, rect; i < len; ++i) {
rect = rects[i];
if (rect) {
tops.push(rect.top);
bottoms.push(rect.bottom);
lefts.push(rect.left);
rights.push(rect.right);
}
}
return new Rect(
Math.min.apply(Math, tops),
Math.max.apply(Math, rights),
Math.max.apply(Math, bottoms),
Math.min.apply(Math, lefts)
);
}
function getTextRangePosition(doc, x, y) {
var textRange = dom.getBody(doc).createTextRange();
textRange.moveToPoint(x, y);
var range = new api.WrappedTextRange(textRange);
return new DomPosition(range.startContainer, range.startOffset);
}
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function caretPositionFromPoint(doc, x, y) {
var pos = doc.caretPositionFromPoint(x, y);
return new DomPosition(pos.offsetNode, pos.offset);
}
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function caretRangeFromPoint(doc, x, y) {
var range = doc.caretRangeFromPoint(x, y);
return new DomPosition(range.startContainer, range.startOffset);
}
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function getLastRangeRect(range) {
var rects = (range.nativeRange || range).getClientRects();
return (rects.length > 0) ? rects[rects.length - 1] : null;
}
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function pointIsInOrAboveRect(x, y, rect) {
console.log("pointIsInOrAboveRect", x, y, Math.floor(rect.top), Math.floor(rect.right), Math.floor(rect.bottom), Math.floor(rect.left))
return y < rect.bottom && x >= rect.left && x <= rect.right;
}
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function positionFromPoint(doc, x, y, favourPrecedingPosition) {
var el = doc.elementFromPoint(x, y);
console.log("elementFromPoint is ", el);
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var range = api.createRange(doc);
range.selectNodeContents(el);
range.collapse(true);
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var node = el.firstChild, offset, rect, textLen;
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if (!node) {
node = el.parentNode;
offset = dom.getNodeIndex(el);
if (!favourPrecedingPosition) {
++offset;
}
} else {
// Search through the text node children of el
main: while (node) {
console.log(node);
if (node.nodeType == 3) {
// Go through the text node character by character
for (offset = 0, textLen = node.length; offset <= textLen; ++offset) {
range.setEnd(node, offset);
rect = getLastRangeRect(range);
if (rect && pointIsInOrAboveRect(x, y, rect)) {
// We've gone past the point. Now we check which side (left or right) of the character the point is nearer to
if (rect.right - x > x - rect.left) {
--offset;
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}
break main;
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}
}
} else {
// Handle elements
range.setEndAfter(node);
rect = getLastRangeRect(range);
if (rect && pointIsInOrAboveRect(x, y, rect)) {
offset = dom.getNodeIndex(node);
node = el.parentNode;
if (!favourPrecedingPosition) {
++offset;
}
break;
}
}
node = node.nextSibling;
}
if (!node) {
node = el;
offset = el.childNodes.length;
}
}
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return new DomPosition(node, offset);
}
function createCaretPositionFromPointGetter(doc) {
if (api.features.implementsTextRange) {
return getTextRangePosition;
} else if (typeof doc.caretPositionFromPoint != UNDEF) {
return caretPositionFromPoint;
} else if (typeof doc.caretRangeFromPoint != UNDEF) {
return caretRangeFromPoint;
} else if (typeof doc.elementFromPoint != UNDEF && rangeSupportsGetClientRects) {
return positionFromPoint;
} else {
throw module.createError("createCaretPositionFromPointGetter(): Browser does not provide a recognised method to create a selection from pixel coordinates");
}
}
function createRangeFromPoints(startX, startY, endX, endY, doc) {
doc = dom.getContentDocument(doc, module, "createRangeFromPoints");
var positionFinder = createCaretPositionFromPointGetter(doc);
var startPos = positionFinder(doc, startX, startY, false);
var endPos = positionFinder(doc, endX, endY, true);
console.log(startPos.node, startPos.offset, endPos.node, endPos.offset);
var range = api.createRange(doc);
range.setStartAndEnd(startPos.node, startPos.offset, endPos.node, endPos.offset);
return range;
}
function moveSelectionToPoints(anchorX, anchorY, focusX, focusY, doc) {
var startX, startY, endX, endY;
// Detect backward selection for coordinates and flip start and end coordinates if necessary
var backward = focusY < anchorY || (anchorY == focusY && focusX < anchorX);
if (backward) {
startX = focusX;
startY = focusY;
endX = anchorX;
endY = anchorY;
} else {
startX = anchorX;
startY = anchorY;
endX = focusX;
endY = focusY;
}
var sel = rangy.getSelection(doc);
var range = createRangeFromPoints(startX, startY, endX, endY, doc);
sel.setSingleRange(range);
return sel;
}
// Test that <span> elements support getBoundingClientRect
var span = document.createElement("span");
var elementSupportsGetBoundingClientRect = util.isHostMethod(span, "getBoundingClientRect");
span = null;
// Test for getBoundingClientRect support in Range
var rangeSupportsGetClientRects = false, rangeSupportsGetBoundingClientRect = false;
if (api.features.implementsDomRange) {
var testRange = api.createNativeRange();
rangeSupportsGetClientRects = util.isHostMethod(testRange, "getClientRects");
rangeSupportsGetBoundingClientRect = util.isHostMethod(testRange, "getBoundingClientRect");
testRange.detach();
}
util.extend(api.features, {
rangeSupportsGetBoundingClientRect: rangeSupportsGetBoundingClientRect,
rangeSupportsGetClientRects: rangeSupportsGetClientRects,
elementSupportsGetBoundingClientRect: elementSupportsGetBoundingClientRect
});
var createClientBoundaryPosGetter = function(isStart) {
return function() {
var boundaryRange = this.cloneRange();
boundaryRange.collapse(isStart);
var rect = boundaryRange.getBoundingClientRect();
return {
x: rect[isStart ? "left" : "right"],
y: rect[isStart ? "top" : "bottom"]
};
};
};
var rangeProto = api.rangePrototype;
if (api.features.implementsTextRange && elementSupportsGetBoundingClientRect) {
rangeProto.getBoundingClientRect = function() {
// We need a TextRange
var textRange = WrappedRange.rangeToTextRange(this);
// Work around table problems (table cell bounding rects seem not to count if TextRange spans cells)
var cells = this.getNodes([1], function(el) {
return /^t[dh]$/i.test(el.tagName);
});
// Merge rects for each cell selected by the range into overall rect
var rect, rects = [];
if (cells.length > 0) {
var lastTable = getAncestorElement(this.startContainer, "table");
for (var i = 0, cell, tempTextRange, table, subRange, subRect; cell = cells[i]; ++i) {
// Handle non-table sections of the range
table = getAncestorElement(cell, "table");
if (!lastTable || table != lastTable) {
// There is a section of the range prior to the current table, or lying between tables.
// Merge in its rect
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subRange = this.cloneRange();
if (lastTable) {
subRange.setStartAfter(lastTable);
}
subRange.setEndBefore(table);
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rects.push(WrappedRange.rangeToTextRange(subRange).getBoundingClientRect());
}
if (this.containsNode(cell)) {
rects.push(cell.getBoundingClientRect());
} else {
tempTextRange = textRange.duplicate();
tempTextRange.moveToElementText(cell);
if (tempTextRange.compareEndPoints("StartToStart", textRange) == -1) {
tempTextRange.setEndPoint("StartToStart", textRange);
} else if (tempTextRange.compareEndPoints("EndToEnd", textRange) == 1) {
tempTextRange.setEndPoint("EndToEnd", textRange);
}
rects.push(tempTextRange.getBoundingClientRect());
}
lastTable = table;
}
// Merge in the rect for any content lying after the final table
var endTable = getAncestorElement(this.endContainer, "table");
if (!endTable && lastTable) {
subRange = this.cloneRange();
subRange.setStartAfter(lastTable);
rects.push(WrappedRange.rangeToTextRange(subRange).getBoundingClientRect());
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}
rect = mergeRects(rects);
} else {
rect = textRange.getBoundingClientRect();
}
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return adjustClientRect(rect, dom.getDocument(this.startContainer));
};
} else if (api.features.implementsDomRange) {
var createWrappedRange = function(range) {
return (range instanceof WrappedRange) ? range : new WrappedRange(range);
};
if (rangeSupportsGetBoundingClientRect) {
rangeProto.getBoundingClientRect = function() {
var nativeRange = createWrappedRange(this).nativeRange;
// Test for WebKit getBoundingClientRect bug (https://bugs.webkit.org/show_bug.cgi?id=65324)
var rect = nativeRange.getBoundingClientRect() || nativeRange.getClientRects()[0];
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return adjustClientRect(rect, dom.getDocument(this.startContainer));
};
if (rangeSupportsGetClientRects) {
var getElementRectsForPosition = function(node, offset) {
var children = node.childNodes;
//if (offset < children.length)
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};
createClientBoundaryPosGetter = function(isStart) {
return function() {
var rect, nativeRange = createWrappedRange(this).nativeRange;
var rects = nativeRange.getClientRects();
if (rects.length == 0 && elementSupportsGetBoundingClientRect) {
if (isStart) {
}
console.log(nativeRange, nativeRange.getClientRects(), nativeRange.getBoundingClientRect());
if (this.collapsed
&& this.startContainer.nodeType == 1
&& this.startOffset < this.startContainer.childNodes.length) {
var n = this.startContainer.childNodes[this.startOffset];
if (n.getClientRects) {
console.log(n, n.getClientRects(), this.startContainer.getClientRects())
}
}
}
if (rects.length > 0) {
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if (isStart) {
rect = rects[0];
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return { x: rect.left, y: rect.top };
} else {
rect = rects[rects.length - 1];
return { x: rect.right, y: rect.bottom };
}
} else {
throw module.createError("Cannot get position for range " + this.inspect());
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}
};
}
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}
} else {
var getElementBoundingClientRect = elementSupportsGetBoundingClientRect ?
function(el) {
return adjustClientRect(el.getBoundingClientRect(), dom.getDocument(el));
} :
// This implementation is very naive. There are many browser quirks that make it extremely
// difficult to get accurate element coordinates in all situations
function(el) {
var x = 0, y = 0, offsetEl = el, width = el.offsetWidth, height = el.offsetHeight;
while (offsetEl) {
x += offsetEl.offsetLeft;
y += offsetEl.offsetTop;
offsetEl = offsetEl.offsetParent;
}
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return adjustClientRect(new Rect(y, x + width, y + height, x), dom.getDocument(el));
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};
var getRectFromBoundaries = function(range) {
var rect;
range.splitBoundaries();
var span = document.createElement("span");
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if (range.collapsed) {
range.insertNode(span);
rect = getElementBoundingClientRect(span);
span.parentNode.removeChild(span);
} else {
// TODO: This isn't right. I'm not sure it can be made right sensibly. Consider what to do.
// This doesn't consider all the line boxes it needs to consider.
var workingRange = range.cloneRange();
// Get the start rectangle
workingRange.collapse(true);
workingRange.insertNode(span);
var startRect = getElementBoundingClientRect(span);
span.parentNode.removeChild(span);
// Get the end rectangle
workingRange.collapseToPoint(range.endContainer, range.endOffset);
workingRange.insertNode(span);
var endRect = getElementBoundingClientRect(span);
span.parentNode.removeChild(span);
// Merge the start and end rects
var rects = [startRect, endRect];
// Merge in rectangles for all elements in the range
var elements = range.getNodes([1], function(el) {
return range.containsNode(el);
});
for (var i = 0, len = elements.length; i < len; ++i) {
rects.push(getElementBoundingClientRect(elements[i]));
}
rect = mergeRects(rects)
}
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// Clean up
range.normalizeBoundaries();
return rect;
};
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rangeProto.getBoundingClientRect = function(range) {
return getRectFromBoundaries(createWrappedRange(range));
};
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}
function createDocumentBoundaryPosGetter(isStart) {
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return function() {
var pos = this["get" + (isStart ? "Start" : "End") + "ClientPos"]();
var scrollPos = getScrollPosition( dom.getWindow(this.startContainer) );
return { x: pos.x + scrollPos.x, y: pos.y + scrollPos.y };
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};
}
}
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util.extend(rangeProto, {
getBoundingDocumentRect: function() {
var scrollPos = getScrollPosition( dom.getWindow(this.startContainer) );
return createRelativeRect(this.getBoundingClientRect(), scrollPos.x, scrollPos.y);
},
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getStartClientPos: createClientBoundaryPosGetter(true),
getEndClientPos: createClientBoundaryPosGetter(false),
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getStartDocumentPos: createDocumentBoundaryPosGetter(true),
getEndDocumentPos: createDocumentBoundaryPosGetter(false)
});
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// Add Selection methods
function compareRanges(r1, r2) {
return r1.compareBoundaryPoints(r2.START_TO_START, r2);
}
function createSelectionRectGetter(isDocument) {
return function() {
var rangeMethodName = "getBounding" + (isDocument ? "Document" : "Client") + "Rect";
var rects = [];
for (var i = 0, rect = null, rangeRect; i < this.rangeCount; ++i) {
rects.push(this.getRangeAt(i)[rangeMethodName]());
}
return mergeRects(rects);
};
}
function createSelectionBoundaryPosGetter(isStart, isDocument) {
return function() {
if (this.rangeCount == 0) {
return null;
}
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var posType = isDocument ? "Document" : "Client";
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var ranges = this.getAllRanges();
if (ranges.length > 1) {
// Order the ranges by position within the DOM
ranges.sort(compareRanges);
}
return isStart ?
ranges[0]["getStart" + posType + "Pos"]() :
ranges[ranges.length - 1]["getEnd" + posType + "Pos"]();
};
}
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util.extend(api.selectionPrototype, {
getBoundingClientRect: createSelectionRectGetter(false),
getBoundingDocumentRect: createSelectionRectGetter(true),
getStartClientPos: createSelectionBoundaryPosGetter(true, false),
getEndClientPos: createSelectionBoundaryPosGetter(false, false),
getStartDocumentPos: createSelectionBoundaryPosGetter(true, true),
getEndDocumentPos: createSelectionBoundaryPosGetter(false, true)
});
api.positionFromPoint = function(x, y, doc) {
doc = dom.getContentDocument(doc, module, "positionFromPoint");
return createCaretPositionFromPointGetter(doc)(doc, x, y);
};
api.createRangeFromPoints = createRangeFromPoints;
api.moveSelectionToPoints = moveSelectionToPoints;
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});