mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-08-28 12:02:40 +00:00
172 lines
6.0 KiB
JavaScript
172 lines
6.0 KiB
JavaScript
/*\
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title: $:/plugins/tiddlywiki/dynannotate/selection-tracker.js
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type: application/javascript
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module-type: library
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Background daemon to track the selection
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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function SelectionTracker(wiki,options) {
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options = options || {};
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var self = this;
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this.wiki = wiki;
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var timerId = null;
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document.addEventListener("selectionchange",function(event) {
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if(timerId) {
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clearTimeout(timerId);
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}
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timerId = setTimeout(function() {
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timerId = null;
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self.handleSelectionChange();
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},500);
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});
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}
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SelectionTracker.prototype.handleSelectionChange = function() {
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var selection = document.getSelection();
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if(selection && selection.type === "Range") {
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// Helper to get the tiddler title corresponding to a chunk container
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var getIdOfContainer = function(domNode) {
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return domNode.id;
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}
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// Get information about the selection anchor and focus
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var getSelectionInfo = function(targetDomNode,targetOffset) {
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// Find the chunk container node
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var domNode = targetDomNode;
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if(domNode.nodeType === Node.TEXT_NODE) {
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domNode = domNode.parentNode;
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}
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var container = domNode.closest(".dynannotate-chunk");
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if(!container) {
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return null;
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}
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// Find the index of the container within the child nodes of its parent
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var childNodeIndex = Array.prototype.indexOf.call(container.parentNode.childNodes,container);
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// Walk through the chunk collecting the text before and after the specified domNode and offset
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var beforeText = null, afterText = [];
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var splitTextResult = function() {
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beforeText = afterText;
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afterText = [];
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},
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processNode = function(domNode) {
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// Check for a text node
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if(domNode.nodeType === Node.TEXT_NODE) {
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// If this is the target node then perform the split
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if(domNode === targetDomNode) {
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afterText.push(domNode.textContent.substring(0,targetOffset));
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splitTextResult();
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afterText.push(domNode.textContent.substring(targetOffset));
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} else {
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afterText.push(domNode.textContent);
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}
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} else {
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// Process the child nodes
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$tw.utils.each(domNode.childNodes,function(childNode,childNodeIndex) {
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// Check whether we need to split on this child node
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if(domNode === targetDomNode && childNodeIndex === targetOffset) {
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splitTextResult();
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}
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processNode(childNode);
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});
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}
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};
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processNode(container);
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if(beforeText === null) {
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splitTextResult();
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}
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// Return results
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return {
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container: container,
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childNodeIndex: childNodeIndex,
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beforeText: beforeText.join(""),
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afterText: afterText.join("")
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}
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}
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var anchor = getSelectionInfo(selection.anchorNode,selection.anchorOffset),
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focus = getSelectionInfo(selection.focusNode,selection.focusOffset);
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// Check that the containers share a parent
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if(anchor && focus && anchor.container.parentNode === focus.container.parentNode) {
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// Make sure that the anchor is before the focus
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if((anchor.childNodeIndex > focus.childNodeIndex) || (anchor.container === focus.container && anchor.beforeText.length > focus.beforeText.length)) {
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var temp = anchor;
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anchor = focus;
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focus = temp;
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}
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var chunks = [];
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// Check for the selection being all in one chunk
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if(anchor.container === focus.container) {
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chunks.push({
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id: getIdOfContainer(anchor.container),
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prefix: anchor.beforeText,
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text: anchor.afterText.substring(0,anchor.afterText.length - focus.afterText.length),
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suffix: focus.afterText
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});
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} else {
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// We span two or more chunks
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chunks.push({
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id: getIdOfContainer(anchor.container),
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prefix: anchor.beforeText,
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text: anchor.afterText
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});
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// Get the titles and text of the intervening tiddlers
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var domNode;
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if(anchor.container !== focus.container) {
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domNode = anchor.container.nextElementSibling;
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while(domNode && domNode !== focus.container) {
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chunks.push({
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id: getIdOfContainer(domNode),
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text: domNode.textContent
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});
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domNode = domNode.nextElementSibling;
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}
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}
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chunks.push({
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id: getIdOfContainer(focus.container),
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text: focus.beforeText,
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suffix: focus.afterText
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});
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}
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// Get the title of the tiddler containing the actions to be executed
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var actionsTiddler = anchor.container.parentNode.getAttribute("data-selection-actions-title");
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// Assemble the variables to be passed to the action
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var variables = {};
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// Get the bounds of the container and the selection
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var selectionRectangle = selection.getRangeAt(0).getBoundingClientRect(),
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offsetParentRectangle = anchor.container.offsetParent.getBoundingClientRect();
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variables["tv-selection-posx"] = (selectionRectangle.left - offsetParentRectangle.left).toString();
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variables["tv-selection-posy"] = (selectionRectangle.top - offsetParentRectangle.top).toString();
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variables["tv-selection-width"] = (selectionRectangle.width).toString();
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variables["tv-selection-height"] = (selectionRectangle.height).toString();
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variables["tv-selection-coords"] = "(" + variables["tv-selection-posx"] + "," + variables["tv-selection-posy"] + "," + variables["tv-selection-width"] + "," + variables["tv-selection-height"] + ")";
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// Collect the attributes from the container
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$tw.utils.each(anchor.container.parentNode.attributes,function(attribute) {
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variables["dom-" + attribute.name] = attribute.value.toString();
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});
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// Action the selection
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this.performSelectionActions(chunks,variables,actionsTiddler);
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}
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}
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};
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SelectionTracker.prototype.performSelectionActions = function(chunks,variables,actionsTiddler) {
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// Invoke the actions, passing the extract tiddler title as a variable
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if(actionsTiddler) {
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var actions = $tw.wiki.getTiddlerText(actionsTiddler)
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if(actions) {
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var selection = JSON.stringify({chunks: chunks,variables: variables});
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$tw.rootWidget.invokeActionString(actions,undefined,undefined,$tw.utils.extend({},variables,{selection: selection}));
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}
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}
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};
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exports.SelectionTracker = SelectionTracker;
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})();
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