620 lines
21 KiB
JavaScript
620 lines
21 KiB
JavaScript
/* Functionality for finding, storing, and restoring selections
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*
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* This does not provide a generic API, just the minimal functionality
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* required by the CodeMirror system.
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*/
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// Namespace object.
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var select = {};
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(function() {
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select.ie_selection = document.selection && document.selection.createRangeCollection;
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// Find the 'top-level' (defined as 'a direct child of the node
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// passed as the top argument') node that the given node is
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// contained in. Return null if the given node is not inside the top
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// node.
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function topLevelNodeAt(node, top) {
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while (node && node.parentNode != top)
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node = node.parentNode;
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return node;
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}
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// Find the top-level node that contains the node before this one.
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function topLevelNodeBefore(node, top) {
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while (!node.previousSibling && node.parentNode != top)
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node = node.parentNode;
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return topLevelNodeAt(node.previousSibling, top);
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}
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var fourSpaces = "\u00a0\u00a0\u00a0\u00a0";
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select.scrollToNode = function(element) {
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if (!element) return;
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var doc = element.ownerDocument, body = doc.body,
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win = (doc.defaultView || doc.parentWindow),
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html = doc.documentElement,
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atEnd = !element.nextSibling || !element.nextSibling.nextSibling
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|| !element.nextSibling.nextSibling.nextSibling;
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// In Opera (and recent Webkit versions), BR elements *always*
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// have a offsetTop property of zero.
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var compensateHack = 0;
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while (element && !element.offsetTop) {
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compensateHack++;
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element = element.previousSibling;
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}
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// atEnd is another kludge for these browsers -- if the cursor is
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// at the end of the document, and the node doesn't have an
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// offset, just scroll to the end.
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if (compensateHack == 0) atEnd = false;
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var y = compensateHack * (element ? element.offsetHeight : 0), x = 0, pos = element;
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while (pos && pos.offsetParent) {
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y += pos.offsetTop;
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// Don't count X offset for <br> nodes
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if (!isBR(pos))
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x += pos.offsetLeft;
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pos = pos.offsetParent;
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}
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var scroll_x = body.scrollLeft || html.scrollLeft || 0,
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scroll_y = body.scrollTop || html.scrollTop || 0,
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screen_x = x - scroll_x, screen_y = y - scroll_y, scroll = false;
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if (screen_x < 0 || screen_x > (win.innerWidth || html.clientWidth || 0)) {
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scroll_x = x;
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scroll = true;
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}
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if (screen_y < 0 || atEnd || screen_y > (win.innerHeight || html.clientHeight || 0) - 50) {
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scroll_y = atEnd ? 1e6 : y;
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scroll = true;
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}
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if (scroll) win.scrollTo(scroll_x, scroll_y);
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};
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select.scrollToCursor = function(container) {
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select.scrollToNode(select.selectionTopNode(container, true) || container.firstChild);
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};
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// Used to prevent restoring a selection when we do not need to.
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var currentSelection = null;
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select.snapshotChanged = function() {
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if (currentSelection) currentSelection.changed = true;
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};
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// This is called by the code in editor.js whenever it is replacing
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// a text node. The function sees whether the given oldNode is part
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// of the current selection, and updates this selection if it is.
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// Because nodes are often only partially replaced, the length of
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// the part that gets replaced has to be taken into account -- the
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// selection might stay in the oldNode if the newNode is smaller
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// than the selection's offset. The offset argument is needed in
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// case the selection does move to the new object, and the given
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// length is not the whole length of the new node (part of it might
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// have been used to replace another node).
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select.snapshotReplaceNode = function(from, to, length, offset) {
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if (!currentSelection) return;
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function replace(point) {
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if (from == point.node) {
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currentSelection.changed = true;
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if (length && point.offset > length) {
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point.offset -= length;
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}
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else {
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point.node = to;
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point.offset += (offset || 0);
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}
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}
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}
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replace(currentSelection.start);
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replace(currentSelection.end);
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};
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select.snapshotMove = function(from, to, distance, relative, ifAtStart) {
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if (!currentSelection) return;
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function move(point) {
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if (from == point.node && (!ifAtStart || point.offset == 0)) {
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currentSelection.changed = true;
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point.node = to;
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if (relative) point.offset = Math.max(0, point.offset + distance);
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else point.offset = distance;
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}
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}
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move(currentSelection.start);
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move(currentSelection.end);
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};
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// Most functions are defined in two ways, one for the IE selection
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// model, one for the W3C one.
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if (select.ie_selection) {
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function selectionNode(win, start) {
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var range = win.document.selection.createRange();
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range.collapse(start);
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function nodeAfter(node) {
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var found = null;
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while (!found && node) {
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found = node.nextSibling;
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node = node.parentNode;
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}
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return nodeAtStartOf(found);
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}
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function nodeAtStartOf(node) {
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while (node && node.firstChild) node = node.firstChild;
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return {node: node, offset: 0};
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}
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var containing = range.parentElement();
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if (!isAncestor(win.document.body, containing)) return null;
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if (!containing.firstChild) return nodeAtStartOf(containing);
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var working = range.duplicate();
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working.moveToElementText(containing);
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working.collapse(true);
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for (var cur = containing.firstChild; cur; cur = cur.nextSibling) {
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if (cur.nodeType == 3) {
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var size = cur.nodeValue.length;
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working.move("character", size);
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}
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else {
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working.moveToElementText(cur);
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working.collapse(false);
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}
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var dir = range.compareEndPoints("StartToStart", working);
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if (dir == 0) return nodeAfter(cur);
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if (dir == 1) continue;
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if (cur.nodeType != 3) return nodeAtStartOf(cur);
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working.setEndPoint("StartToEnd", range);
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return {node: cur, offset: size - working.text.length};
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}
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return nodeAfter(containing);
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}
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select.markSelection = function(win) {
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currentSelection = null;
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var sel = win.document.selection;
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if (!sel) return;
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var start = selectionNode(win, true),
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end = selectionNode(win, false);
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if (!start || !end) return;
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currentSelection = {start: start, end: end, window: win, changed: false};
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};
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select.selectMarked = function() {
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if (!currentSelection || !currentSelection.changed) return;
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var win = currentSelection.window, doc = win.document;
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function makeRange(point) {
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var range = doc.body.createTextRange(),
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node = point.node;
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if (!node) {
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range.moveToElementText(currentSelection.window.document.body);
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range.collapse(false);
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}
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else if (node.nodeType == 3) {
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range.moveToElementText(node.parentNode);
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var offset = point.offset;
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while (node.previousSibling) {
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node = node.previousSibling;
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offset += (node.innerText || "").length;
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}
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range.move("character", offset);
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}
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else {
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range.moveToElementText(node);
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range.collapse(true);
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}
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return range;
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}
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var start = makeRange(currentSelection.start), end = makeRange(currentSelection.end);
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start.setEndPoint("StartToEnd", end);
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start.select();
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};
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// Get the top-level node that one end of the cursor is inside or
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// after. Note that this returns false for 'no cursor', and null
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// for 'start of document'.
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select.selectionTopNode = function(container, start) {
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var selection = container.ownerDocument.selection;
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if (!selection) return false;
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var range = selection.createRange(), range2 = range.duplicate();
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range.collapse(start);
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var around = range.parentElement();
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if (around && isAncestor(container, around)) {
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// Only use this node if the selection is not at its start.
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range2.moveToElementText(around);
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if (range.compareEndPoints("StartToStart", range2) == 1)
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return topLevelNodeAt(around, container);
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}
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// Move the start of a range to the start of a node,
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// compensating for the fact that you can't call
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// moveToElementText with text nodes.
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function moveToNodeStart(range, node) {
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if (node.nodeType == 3) {
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var count = 0, cur = node.previousSibling;
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while (cur && cur.nodeType == 3) {
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count += cur.nodeValue.length;
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cur = cur.previousSibling;
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}
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if (cur) {
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try{range.moveToElementText(cur);}
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catch(e){return false;}
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range.collapse(false);
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}
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else range.moveToElementText(node.parentNode);
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if (count) range.move("character", count);
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}
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else {
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try{range.moveToElementText(node);}
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catch(e){return false;}
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}
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return true;
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}
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// Do a binary search through the container object, comparing
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// the start of each node to the selection
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var start = 0, end = container.childNodes.length - 1;
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while (start < end) {
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var middle = Math.ceil((end + start) / 2), node = container.childNodes[middle];
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if (!node) return false; // Don't ask. IE6 manages this sometimes.
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if (!moveToNodeStart(range2, node)) return false;
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if (range.compareEndPoints("StartToStart", range2) == 1)
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start = middle;
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else
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end = middle - 1;
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}
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return container.childNodes[start] || null;
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};
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// Place the cursor after this.start. This is only useful when
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// manually moving the cursor instead of restoring it to its old
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// position.
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select.focusAfterNode = function(node, container) {
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var range = container.ownerDocument.body.createTextRange();
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range.moveToElementText(node || container);
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range.collapse(!node);
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range.select();
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};
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select.somethingSelected = function(win) {
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var sel = win.document.selection;
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return sel && (sel.createRange().text != "");
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};
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function insertAtCursor(window, html) {
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var selection = window.document.selection;
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if (selection) {
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var range = selection.createRange();
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range.pasteHTML(html);
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range.collapse(false);
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range.select();
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}
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}
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// Used to normalize the effect of the enter key, since browsers
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// do widely different things when pressing enter in designMode.
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select.insertNewlineAtCursor = function(window) {
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insertAtCursor(window, "<br>");
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};
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select.insertTabAtCursor = function(window) {
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insertAtCursor(window, fourSpaces);
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};
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// Get the BR node at the start of the line on which the cursor
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// currently is, and the offset into the line. Returns null as
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// node if cursor is on first line.
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select.cursorPos = function(container, start) {
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var selection = container.ownerDocument.selection;
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if (!selection) return null;
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var topNode = select.selectionTopNode(container, start);
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while (topNode && !isBR(topNode))
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topNode = topNode.previousSibling;
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var range = selection.createRange(), range2 = range.duplicate();
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range.collapse(start);
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if (topNode) {
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range2.moveToElementText(topNode);
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range2.collapse(false);
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}
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else {
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// When nothing is selected, we can get all kinds of funky errors here.
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try { range2.moveToElementText(container); }
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catch (e) { return null; }
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range2.collapse(true);
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}
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range.setEndPoint("StartToStart", range2);
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return {node: topNode, offset: range.text.length};
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};
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select.setCursorPos = function(container, from, to) {
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function rangeAt(pos) {
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var range = container.ownerDocument.body.createTextRange();
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if (!pos.node) {
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range.moveToElementText(container);
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range.collapse(true);
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}
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else {
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range.moveToElementText(pos.node);
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range.collapse(false);
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}
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range.move("character", pos.offset);
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return range;
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}
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var range = rangeAt(from);
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if (to && to != from)
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range.setEndPoint("EndToEnd", rangeAt(to));
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range.select();
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}
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// Some hacks for storing and re-storing the selection when the editor loses and regains focus.
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select.getBookmark = function (container) {
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var from = select.cursorPos(container, true), to = select.cursorPos(container, false);
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if (from && to) return {from: from, to: to};
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};
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// Restore a stored selection.
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select.setBookmark = function(container, mark) {
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if (!mark) return;
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select.setCursorPos(container, mark.from, mark.to);
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};
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}
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// W3C model
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else {
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// Store start and end nodes, and offsets within these, and refer
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// back to the selection object from those nodes, so that this
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// object can be updated when the nodes are replaced before the
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// selection is restored.
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select.markSelection = function (win) {
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var selection = win.getSelection();
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if (!selection || selection.rangeCount == 0)
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return (currentSelection = null);
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var range = selection.getRangeAt(0);
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currentSelection = {
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start: {node: range.startContainer, offset: range.startOffset},
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end: {node: range.endContainer, offset: range.endOffset},
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window: win,
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changed: false
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};
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// We want the nodes right at the cursor, not one of their
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// ancestors with a suitable offset. This goes down the DOM tree
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// until a 'leaf' is reached (or is it *up* the DOM tree?).
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function normalize(point){
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while (point.node.nodeType != 3 && !isBR(point.node)) {
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var newNode = point.node.childNodes[point.offset] || point.node.nextSibling;
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point.offset = 0;
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while (!newNode && point.node.parentNode) {
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point.node = point.node.parentNode;
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newNode = point.node.nextSibling;
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}
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point.node = newNode;
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if (!newNode)
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break;
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}
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}
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normalize(currentSelection.start);
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normalize(currentSelection.end);
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};
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select.selectMarked = function () {
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var cs = currentSelection;
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// on webkit-based browsers, it is apparently possible that the
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// selection gets reset even when a node that is not one of the
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// endpoints get messed with. the most common situation where
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// this occurs is when a selection is deleted or overwitten. we
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// check for that here.
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function focusIssue() {
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return cs.start.node == cs.end.node && cs.start.offset == 0 && cs.end.offset == 0;
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}
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if (!cs || !(cs.changed || (webkit && focusIssue()))) return;
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var win = cs.window, range = win.document.createRange();
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function setPoint(point, which) {
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if (point.node) {
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// Some magic to generalize the setting of the start and end
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// of a range.
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if (point.offset == 0)
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range["set" + which + "Before"](point.node);
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else
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range["set" + which](point.node, point.offset);
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}
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else {
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range.setStartAfter(win.document.body.lastChild || win.document.body);
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}
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}
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setPoint(cs.end, "End");
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setPoint(cs.start, "Start");
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selectRange(range, win);
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};
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// Helper for selecting a range object.
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function selectRange(range, window) {
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var selection = window.getSelection();
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selection.removeAllRanges();
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selection.addRange(range);
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};
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function selectionRange(window) {
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var selection = window.getSelection();
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if (!selection || selection.rangeCount == 0)
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return false;
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else
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return selection.getRangeAt(0);
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}
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// Finding the top-level node at the cursor in the W3C is, as you
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// can see, quite an involved process.
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select.selectionTopNode = function(container, start) {
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var range = selectionRange(container.ownerDocument.defaultView);
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if (!range) return false;
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var node = start ? range.startContainer : range.endContainer;
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var offset = start ? range.startOffset : range.endOffset;
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// Work around (yet another) bug in Opera's selection model.
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if (window.opera && !start && range.endContainer == container && range.endOffset == range.startOffset + 1 &&
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container.childNodes[range.startOffset] && isBR(container.childNodes[range.startOffset]))
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offset--;
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// For text nodes, we look at the node itself if the cursor is
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// inside, or at the node before it if the cursor is at the
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// start.
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if (node.nodeType == 3){
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if (offset > 0)
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return topLevelNodeAt(node, container);
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else
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return topLevelNodeBefore(node, container);
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}
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// Occasionally, browsers will return the HTML node as
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// selection. If the offset is 0, we take the start of the frame
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// ('after null'), otherwise, we take the last node.
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else if (node.nodeName.toUpperCase() == "HTML") {
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return (offset == 1 ? null : container.lastChild);
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}
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// If the given node is our 'container', we just look up the
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// correct node by using the offset.
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else if (node == container) {
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return (offset == 0) ? null : node.childNodes[offset - 1];
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}
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// In any other case, we have a regular node. If the cursor is
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// at the end of the node, we use the node itself, if it is at
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// the start, we use the node before it, and in any other
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// case, we look up the child before the cursor and use that.
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else {
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if (offset == node.childNodes.length)
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return topLevelNodeAt(node, container);
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else if (offset == 0)
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return topLevelNodeBefore(node, container);
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else
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return topLevelNodeAt(node.childNodes[offset - 1], container);
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}
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};
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select.focusAfterNode = function(node, container) {
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var win = container.ownerDocument.defaultView,
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range = win.document.createRange();
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range.setStartBefore(container.firstChild || container);
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// In Opera, setting the end of a range at the end of a line
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// (before a BR) will cause the cursor to appear on the next
|
|
// line, so we set the end inside of the start node when
|
|
// possible.
|
|
if (node && !node.firstChild)
|
|
range.setEndAfter(node);
|
|
else if (node)
|
|
range.setEnd(node, node.childNodes.length);
|
|
else
|
|
range.setEndBefore(container.firstChild || container);
|
|
range.collapse(false);
|
|
selectRange(range, win);
|
|
};
|
|
|
|
select.somethingSelected = function(win) {
|
|
var range = selectionRange(win);
|
|
return range && !range.collapsed;
|
|
};
|
|
|
|
function insertNodeAtCursor(window, node) {
|
|
var range = selectionRange(window);
|
|
if (!range) return;
|
|
|
|
range.deleteContents();
|
|
range.insertNode(node);
|
|
webkitLastLineHack(window.document.body);
|
|
range = window.document.createRange();
|
|
range.selectNode(node);
|
|
range.collapse(false);
|
|
selectRange(range, window);
|
|
}
|
|
|
|
select.insertNewlineAtCursor = function(window) {
|
|
insertNodeAtCursor(window, window.document.createElement("BR"));
|
|
};
|
|
|
|
select.insertTabAtCursor = function(window) {
|
|
insertNodeAtCursor(window, window.document.createTextNode(fourSpaces));
|
|
};
|
|
|
|
select.cursorPos = function(container, start) {
|
|
var range = selectionRange(window);
|
|
if (!range) return;
|
|
|
|
var topNode = select.selectionTopNode(container, start);
|
|
while (topNode && !isBR(topNode))
|
|
topNode = topNode.previousSibling;
|
|
|
|
range = range.cloneRange();
|
|
range.collapse(start);
|
|
if (topNode)
|
|
range.setStartAfter(topNode);
|
|
else
|
|
range.setStartBefore(container);
|
|
return {node: topNode, offset: range.toString().length};
|
|
};
|
|
|
|
select.setCursorPos = function(container, from, to) {
|
|
var win = container.ownerDocument.defaultView,
|
|
range = win.document.createRange();
|
|
|
|
function setPoint(node, offset, side) {
|
|
if (offset == 0 && node && !node.nextSibling) {
|
|
range["set" + side + "After"](node);
|
|
return true;
|
|
}
|
|
|
|
if (!node)
|
|
node = container.firstChild;
|
|
else
|
|
node = node.nextSibling;
|
|
|
|
if (!node) return;
|
|
|
|
if (offset == 0) {
|
|
range["set" + side + "Before"](node);
|
|
return true;
|
|
}
|
|
|
|
var backlog = []
|
|
function decompose(node) {
|
|
if (node.nodeType == 3)
|
|
backlog.push(node);
|
|
else
|
|
forEach(node.childNodes, decompose);
|
|
}
|
|
while (true) {
|
|
while (node && !backlog.length) {
|
|
decompose(node);
|
|
node = node.nextSibling;
|
|
}
|
|
var cur = backlog.shift();
|
|
if (!cur) return false;
|
|
|
|
var length = cur.nodeValue.length;
|
|
if (length >= offset) {
|
|
range["set" + side](cur, offset);
|
|
return true;
|
|
}
|
|
offset -= length;
|
|
}
|
|
}
|
|
|
|
to = to || from;
|
|
if (setPoint(to.node, to.offset, "End") && setPoint(from.node, from.offset, "Start"))
|
|
selectRange(range, win);
|
|
};
|
|
}
|
|
})();
|