mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/VisualEditor
synced 2024-11-25 23:05:35 +00:00
741fa76868
Rangy files are now 1.2 and I've added 1.3 alpha versions to make it easier to switch between while testing. Change-Id: I2f5d86b14bd4f87719d01e3255c28f0ae8764f4f
540 lines
22 KiB
JavaScript
540 lines
22 KiB
JavaScript
/**
|
|
* Position module for Rangy.
|
|
* 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
|
|
* Licensed under the MIT license.
|
|
* Version: 1.3alpha.772
|
|
* Build date: 26 February 2013
|
|
*/
|
|
rangy.createModule("Position", function(api, module) {
|
|
api.requireModules( ["WrappedSelection", "WrappedRange"] );
|
|
|
|
//var log = log4javascript.getLogger("rangy.position");
|
|
|
|
var NUMBER = "number", UNDEF = "undefined";
|
|
var WrappedRange = api.WrappedRange;
|
|
var dom = api.dom, util = api.util, DomPosition = dom.DomPosition;
|
|
|
|
// Feature detection
|
|
|
|
//var caretPositionFromPointSupported = (typeof document.caretPositionFromPoint != UNDEF);
|
|
|
|
// 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.
|
|
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);
|
|
}
|
|
|
|
function caretPositionFromPoint(doc, x, y) {
|
|
var pos = doc.caretPositionFromPoint(x, y);
|
|
return new DomPosition(pos.offsetNode, pos.offset);
|
|
}
|
|
|
|
function caretRangeFromPoint(doc, x, y) {
|
|
var range = doc.caretRangeFromPoint(x, y);
|
|
return new DomPosition(range.startContainer, range.startOffset);
|
|
}
|
|
|
|
function getLastRangeRect(range) {
|
|
var rects = (range.nativeRange || range).getClientRects();
|
|
return (rects.length > 0) ? rects[rects.length - 1] : null;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
function positionFromPoint(doc, x, y, favourPrecedingPosition) {
|
|
var el = doc.elementFromPoint(x, y);
|
|
|
|
console.log("elementFromPoint is ", el);
|
|
|
|
var range = api.createRange(doc);
|
|
range.selectNodeContents(el);
|
|
range.collapse(true);
|
|
|
|
var node = el.firstChild, offset, rect, textLen;
|
|
|
|
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;
|
|
}
|
|
break main;
|
|
}
|
|
}
|
|
} 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;
|
|
}
|
|
}
|
|
|
|
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
|
|
subRange = this.cloneRange();
|
|
if (lastTable) {
|
|
subRange.setStartAfter(lastTable);
|
|
}
|
|
subRange.setEndBefore(table);
|
|
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());
|
|
}
|
|
rect = mergeRects(rects);
|
|
} else {
|
|
rect = textRange.getBoundingClientRect();
|
|
}
|
|
|
|
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];
|
|
return adjustClientRect(rect, dom.getDocument(this.startContainer));
|
|
};
|
|
|
|
if (rangeSupportsGetClientRects) {
|
|
var getElementRectsForPosition = function(node, offset) {
|
|
var children = node.childNodes;
|
|
//if (offset < children.length)
|
|
};
|
|
|
|
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) {
|
|
if (isStart) {
|
|
rect = rects[0];
|
|
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());
|
|
}
|
|
};
|
|
}
|
|
}
|
|
} 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;
|
|
}
|
|
|
|
return adjustClientRect(new Rect(y, x + width, y + height, x), dom.getDocument(el));
|
|
};
|
|
|
|
var getRectFromBoundaries = function(range) {
|
|
var rect;
|
|
range.splitBoundaries();
|
|
var span = document.createElement("span");
|
|
|
|
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)
|
|
}
|
|
|
|
// Clean up
|
|
range.normalizeBoundaries();
|
|
return rect;
|
|
};
|
|
|
|
rangeProto.getBoundingClientRect = function(range) {
|
|
return getRectFromBoundaries(createWrappedRange(range));
|
|
};
|
|
}
|
|
|
|
function createDocumentBoundaryPosGetter(isStart) {
|
|
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 };
|
|
};
|
|
}
|
|
}
|
|
|
|
util.extend(rangeProto, {
|
|
getBoundingDocumentRect: function() {
|
|
var scrollPos = getScrollPosition( dom.getWindow(this.startContainer) );
|
|
return createRelativeRect(this.getBoundingClientRect(), scrollPos.x, scrollPos.y);
|
|
},
|
|
|
|
getStartClientPos: createClientBoundaryPosGetter(true),
|
|
getEndClientPos: createClientBoundaryPosGetter(false),
|
|
|
|
getStartDocumentPos: createDocumentBoundaryPosGetter(true),
|
|
getEndDocumentPos: createDocumentBoundaryPosGetter(false)
|
|
});
|
|
|
|
// 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;
|
|
}
|
|
|
|
var posType = isDocument ? "Document" : "Client";
|
|
|
|
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"]();
|
|
};
|
|
}
|
|
|
|
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;
|
|
});
|