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https://gerrit.wikimedia.org/r/mediawiki/extensions/VisualEditor
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365 lines
16 KiB
JavaScript
365 lines
16 KiB
JavaScript
/**
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* @license 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.
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*
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* Part of Rangy, a cross-browser JavaScript range and selection library
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* http://code.google.com/p/rangy/
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*
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* Depends on Rangy core.
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*
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* Copyright %%build:year%%, Tim Down
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* Licensed under the MIT license.
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* Version: %%build:version%%
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* Build date: %%build:date%%
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*/
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rangy.createModule("Coordinates", function(api, module) {
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api.requireModules( ["WrappedSelection", "WrappedRange"] );
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var NUMBER = "number";
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var WrappedRange = api.WrappedRange;
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var dom = api.dom, util = api.util;
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// Since Rangy can deal with multiple documents, we have to do the checks every time, unless we cache a
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// getScrollPosition function in each document. This would necessarily pollute the document's global
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// namespace, which I'm choosing to view as a greater evil than a slight performance hit.
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function getScrollPosition(win) {
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var x = 0, y = 0;
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if (typeof win.pageXOffset == NUMBER && typeof win.pageYOffset == NUMBER) {
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x = win.pageXOffset;
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y = win.pageYOffset;
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} else {
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var doc = win.document;
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var docEl = doc.documentElement;
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var compatMode = doc.compatMode;
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var scrollEl = (typeof compatMode == "string" && compatMode.indexOf("CSS") >= 0 && docEl)
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? docEl : dom.getBody(doc);
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if (scrollEl && typeof scrollEl.scrollLeft == NUMBER && typeof scrollEl.scrollTop == NUMBER) {
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try {
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x = scrollEl.scrollLeft;
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y = scrollEl.scrollTop;
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} catch (ex) {}
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}
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}
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return { x: x, y: y };
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}
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function getAncestorElement(node, tagName) {
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tagName = tagName.toLowerCase();
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while (node) {
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if (node.nodeType == 1 && node.tagName.toLowerCase() == tagName) {
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return node;
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}
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node = node.parentNode;
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}
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return null;
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}
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function Rect(top, right, bottom, left) {
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this.top = top;
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this.right = right;
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this.bottom = bottom;
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this.left = left;
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this.width = right - left;
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this.height = bottom - top;
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}
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function createRelativeRect(rect, dx, dy) {
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return new Rect(rect.top + dy, rect.right + dx, rect.bottom + dy, rect.left + dx);
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}
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function adjustClientRect(rect, doc) {
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// Older IEs have an issue with a two pixel margin on the body element
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var dx = 0, dy = 0;
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var docEl = doc.documentElement, body = dom.getBody(doc);
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var container = (docEl.clientWidth === 0 && typeof body.clientTop == NUMBER) ? body : docEl;
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var clientLeft = container.clientLeft, clientTop = container.clientTop;
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if (clientLeft) {
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dx = -clientLeft;
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}
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if (clientTop) {
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dy = -clientTop;
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}
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return createRelativeRect(rect, dx, dy);
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}
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function mergeRects(rects) {
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var tops = [], bottoms = [], lefts = [], rights = [];
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for (var i = 0, len = rects.length, rect; i < len; ++i) {
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rect = rects[i];
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if (rect) {
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tops.push(rect.top);
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bottoms.push(rect.bottom);
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lefts.push(rect.left);
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rights.push(rect.right);
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}
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}
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return new Rect(
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Math.min.apply(Math, tops),
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Math.max.apply(Math, rights),
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Math.max.apply(Math, bottoms),
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Math.min.apply(Math, lefts)
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);
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}
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(function() {
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// Test that <span> elements support getBoundingClientRect
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var span = document.createElement("span");
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var elementSupportsGetBoundingClientRect = util.isHostMethod(span, "getBoundingClientRect");
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span = null;
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// Test for getBoundingClientRect support in Range
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var rangeSupportsGetClientRects = false, rangeSupportsGetBoundingClientRect = false;
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if (api.features.implementsDomRange) {
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var testRange = api.createNativeRange();
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rangeSupportsGetClientRects = util.isHostMethod(testRange, "getClientRects");
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rangeSupportsGetBoundingClientRect = util.isHostMethod(testRange, "getBoundingClientRect");
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testRange.detach();
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}
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util.extend(api.features, {
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rangeSupportsGetBoundingClientRect: rangeSupportsGetBoundingClientRect,
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rangeSupportsGetClientRects: rangeSupportsGetClientRects,
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elementSupportsGetBoundingClientRect: elementSupportsGetBoundingClientRect
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});
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var createClientBoundaryPosGetter = function(isStart) {
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return function() {
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var boundaryRange = this.cloneRange();
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boundaryRange.collapse(isStart);
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var rect = boundaryRange.getBoundingClientRect();
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return { x: rect[isStart ? "left" : "right"], y: rect[isStart ? "top" : "bottom"] };
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};
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};
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var rangeProto = api.rangePrototype;
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if (api.features.implementsTextRange && elementSupportsGetBoundingClientRect) {
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rangeProto.getBoundingClientRect = function() {
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// We need a TextRange
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var textRange = WrappedRange.rangeToTextRange(this);
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// Work around table problems (table cell bounding rects seem not to count if TextRange spans cells)
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var cells = this.getNodes([1], function(el) {
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return /^t[dh]$/i.test(el.tagName);
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});
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// Merge rects for each cell selected by the range into overall rect
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var rect, rects = [];
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if (cells.length > 0) {
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var lastTable = getAncestorElement(this.startContainer, "table");
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for (var i = 0, cell, tempTextRange, table, subRange, subRect; cell = cells[i]; ++i) {
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// Handle non-table sections of the range
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table = getAncestorElement(cell, "table");
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if (!lastTable || table != lastTable) {
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// There is a section of the range prior to the current table, or lying between tables.
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// Merge in its rect
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subRange = this.cloneRange();
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if (lastTable) {
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subRange.setStartAfter(lastTable);
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}
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subRange.setEndBefore(table);
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rects.push(WrappedRange.rangeToTextRange(subRange).getBoundingClientRect());
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}
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if (this.containsNode(cell)) {
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rects.push(cell.getBoundingClientRect());
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} else {
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tempTextRange = textRange.duplicate();
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tempTextRange.moveToElementText(cell);
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if (tempTextRange.compareEndPoints("StartToStart", textRange) == -1) {
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tempTextRange.setEndPoint("StartToStart", textRange);
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} else if (tempTextRange.compareEndPoints("EndToEnd", textRange) == 1) {
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tempTextRange.setEndPoint("EndToEnd", textRange);
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}
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rects.push(tempTextRange.getBoundingClientRect());
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}
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lastTable = table;
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}
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// Merge in the rect for any content lying after the final table
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var endTable = getAncestorElement(this.endContainer, "table");
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if (!endTable && lastTable) {
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subRange = this.cloneRange();
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subRange.setStartAfter(lastTable);
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rects.push(WrappedRange.rangeToTextRange(subRange).getBoundingClientRect());
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}
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rect = mergeRects(rects);
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} else {
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rect = textRange.getBoundingClientRect();
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}
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return adjustClientRect(rect, dom.getDocument(this.startContainer));
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};
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} else if (api.features.implementsDomRange) {
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var createWrappedRange = function(range) {
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return (range instanceof WrappedRange) ? range : new WrappedRange(range);
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};
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if (rangeSupportsGetBoundingClientRect) {
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rangeProto.getBoundingClientRect = function() {
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var nativeRange = createWrappedRange(this).nativeRange;
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// Test for WebKit getBoundingClientRect bug (https://bugs.webkit.org/show_bug.cgi?id=65324)
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var rect = nativeRange.getBoundingClientRect() || nativeRange.getClientRects()[0];
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return adjustClientRect(rect, dom.getDocument(this.startContainer));
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};
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if (rangeSupportsGetClientRects) {
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createClientBoundaryPosGetter = function(isStart) {
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return function() {
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var rect, nativeRange = createWrappedRange(this).nativeRange;
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if (isStart) {
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rect = nativeRange.getClientRects()[0];
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return { x: rect.left, y: rect.top };
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} else {
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var rects = nativeRange.getClientRects();
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rect = rects[rects.length - 1];
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return { x: rect.right, y: rect.bottom };
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}
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};
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}
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}
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} else {
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var getElementBoundingClientRect = elementSupportsGetBoundingClientRect ?
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function(el) {
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return adjustClientRect(el.getBoundingClientRect(), dom.getDocument(el));
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} :
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// This implementation is very naive. There are many browser quirks that make it extremely
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// difficult to get accurate element coordinates in all situations
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function(el) {
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var x = 0, y = 0, offsetEl = el, width = el.offsetWidth, height = el.offsetHeight;
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while (offsetEl) {
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x += offsetEl.offsetLeft;
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y += offsetEl.offsetTop;
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offsetEl = offsetEl.offsetParent;
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}
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return adjustClientRect(new Rect(y, x + width, y + height, x), dom.getDocument(el));
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};
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var getRectFromBoundaries = function(range) {
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var rect;
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range.splitBoundaries();
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var span = document.createElement("span");
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if (range.collapsed) {
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range.insertNode(span);
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rect = getElementBoundingClientRect(span);
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span.parentNode.removeChild(span);
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} else {
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// TODO: This isn't right. I'm not sure it can be made right sensibly. Consider what to do.
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// This doesn't consider all the line boxes it needs to consider.
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var workingRange = range.cloneRange();
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// Get the start rectangle
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workingRange.collapse(true);
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workingRange.insertNode(span);
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var startRect = getElementBoundingClientRect(span);
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span.parentNode.removeChild(span);
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// Get the end rectangle
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workingRange.collapseToPoint(range.endContainer, range.endOffset);
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workingRange.insertNode(span);
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var endRect = getElementBoundingClientRect(span);
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span.parentNode.removeChild(span);
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// Merge the start and end rects
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var rects = [startRect, endRect];
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// Merge in rectangles for all elements in the range
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var elements = range.getNodes([1], function(el) {
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return range.containsNode(el);
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});
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for (var i = 0, len = elements.length; i < len; ++i) {
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rects.push(getElementBoundingClientRect(elements[i]));
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}
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rect = mergeRects(rects)
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}
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// Clean up
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range.normalizeBoundaries();
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return rect;
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};
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rangeProto.getBoundingClientRect = function(range) {
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return getRectFromBoundaries(createWrappedRange(range));
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};
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}
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function createDocumentBoundaryPosGetter(isStart) {
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return function() {
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var pos = this["get" + (isStart ? "Start" : "End") + "ClientPos"]();
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var scrollPos = getScrollPosition( dom.getWindow(this.startContainer) );
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return { x: pos.x + scrollPos.x, y: pos.y + scrollPos.y };
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};
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}
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}
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util.extend(rangeProto, {
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getBoundingDocumentRect: function() {
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var scrollPos = getScrollPosition( dom.getWindow(this.startContainer) );
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return createRelativeRect(this.getBoundingClientRect(), scrollPos.x, scrollPos.y);
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},
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getStartClientPos: createClientBoundaryPosGetter(true),
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getEndClientPos: createClientBoundaryPosGetter(false),
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getStartDocumentPos: createDocumentBoundaryPosGetter(true),
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getEndDocumentPos: createDocumentBoundaryPosGetter(false)
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});
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})();
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// Add Selection methods
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(function() {
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function compareRanges(r1, r2) {
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return r1.compareBoundaryPoints(r2.START_TO_START, r2);
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}
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function createSelectionRectGetter(isDocument) {
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return function() {
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var rangeMethodName = "getBounding" + (isDocument ? "Document" : "Client") + "Rect";
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var rects = [];
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for (var i = 0, rect = null, rangeRect; i < this.rangeCount; ++i) {
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rects.push(this.getRangeAt(i)[rangeMethodName]());
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}
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return mergeRects(rects);
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};
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}
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function createSelectionBoundaryPosGetter(isStart, isDocument) {
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return function() {
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if (this.rangeCount == 0) {
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return null;
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}
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var posType = isDocument ? "Document" : "Client";
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var ranges = this.getAllRanges();
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if (ranges.length > 1) {
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// Order the ranges by position within the DOM
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ranges.sort(compareRanges);
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}
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return isStart ?
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ranges[0]["getStart" + posType + "Pos"]() :
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ranges[ranges.length - 1]["getEnd" + posType + "Pos"]();
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};
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}
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util.extend(api.selectionPrototype, {
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getBoundingClientRect: createSelectionRectGetter(false),
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getBoundingDocumentRect: createSelectionRectGetter(true),
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getStartClientPos: createSelectionBoundaryPosGetter(true, false),
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getEndClientPos: createSelectionBoundaryPosGetter(false, false),
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getStartDocumentPos: createSelectionBoundaryPosGetter(true, true),
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getEndDocumentPos: createSelectionBoundaryPosGetter(false, true)
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});
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})();
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});
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