412 lines
12 KiB
JavaScript
412 lines
12 KiB
JavaScript
/*\
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title: $:/plugins/tiddlywiki/innerwiki/innerwiki.js
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type: application/javascript
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module-type: widget
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Widget to display an innerwiki in an iframe
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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var DEFAULT_INNERWIKI_TEMPLATE = "$:/plugins/tiddlywiki/innerwiki/template";
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var Widget = require("$:/core/modules/widgets/widget.js").widget,
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DataWidget = require("$:/plugins/tiddlywiki/innerwiki/data.js").data,
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dm = $tw.utils.domMaker;
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var InnerWikiWidget = function(parseTreeNode,options) {
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this.initialise(parseTreeNode,options);
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};
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/*
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Inherit from the base widget class
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*/
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InnerWikiWidget.prototype = new Widget();
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/*
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Render this widget into the DOM
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*/
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InnerWikiWidget.prototype.render = function(parent,nextSibling) {
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var self = this;
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this.parentDomNode = parent;
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this.computeAttributes();
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this.execute();
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// Create wrapper
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this.domWrapper = dm("div",{
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document: this.document,
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"class": (this.innerWikiClass || "").split(" ").concat(["tc-innerwiki-wrapper"]).join(" "),
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style: {
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overflow: "hidden",
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position: "relative",
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boxSizing: "content-box"
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}
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});
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// Set up the SVG container
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this.domSVG = dm("svg",{
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namespace: "http://www.w3.org/2000/svg",
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document: this.document,
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style: {
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width: "100%",
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position: "absolute",
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zIndex: "1",
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pointerEvents: "none"
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},
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attributes: {
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"viewBox": "0 0 " + this.innerWikiClipWidth + " " + this.innerWikiClipHeight
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}
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});
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this.domWrapper.appendChild(this.domSVG);
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this.setVariable("namespace","http://www.w3.org/2000/svg");
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// Create the iframe for the browser or image for Node.js
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if(!this.document.isTiddlyWikiFakeDom) {
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// Create iframe
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this.domIFrame = dm("iframe",{
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document: this.document,
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"class": "tc-innerwiki-iframe",
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style: {
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position: "absolute",
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maxWidth: "none",
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border: "none"
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},
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attributes: {
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width: this.innerWikiWidth,
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height: this.innerWikiHeight
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}
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});
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this.domWrapper.appendChild(this.domIFrame);
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} else {
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// Create image placeholder
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this.domImage = dm("img",{
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document: this.document,
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style: {
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width: "100%"
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},
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attributes: {
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src: this.innerWikiFilename
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}
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});
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this.domWrapper.appendChild(this.domImage);
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}
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// Insert wrapper into the DOM
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parent.insertBefore(this.domWrapper,nextSibling);
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this.renderChildren(this.domSVG,null);
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this.domNodes.push(this.domWrapper);
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// If we're on the real DOM, finish the initialisation that needs us to be in the DOM
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if(!this.document.isTiddlyWikiFakeDom) {
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// Write the HTML
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this.domIFrame.contentDocument.open();
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this.domIFrame.contentDocument.write(this.createInnerHTML());
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this.domIFrame.contentDocument.close();
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}
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// Scale the iframe and adjust the height of the wrapper
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this.clipLeft = this.innerWikiClipLeft;
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this.clipTop = this.innerWikiClipTop;
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this.clipWidth = this.innerWikiClipWidth;
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this.clipHeight = this.innerWikiClipHeight;
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this.scale = this.domWrapper.clientWidth / this.clipWidth;
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// Display the anchors
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if(!this.document.isTiddlyWikiFakeDom) {
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this.domAnchorContainer = dm("div",{
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document: this.document,
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style: {
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position: "relative",
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zIndex: "2",
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transformOrigin: "0 0",
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transform: "scale(" + this.scale + ")"
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}
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});
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this.domAnchorBackdrop = dm("div",{
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document: this.document,
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style: {
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position: "absolute",
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display: "none"
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}
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});
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this.domAnchorContainer.appendChild(this.domAnchorBackdrop);
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this.domWrapper.insertBefore(this.domAnchorContainer,this.domWrapper.firstChild);
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self.createAnchors();
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}
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// Scale the iframe and adjust the height of the wrapper
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if(!this.document.isTiddlyWikiFakeDom) {
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this.domIFrame.style.transformOrigin = this.clipLeft + "px " + this.clipTop + "px";
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this.domIFrame.style.transform = "translate(" + (-this.clipLeft) + "px," + (-this.clipTop) + "px) scale(" + this.scale + ")";
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this.domWrapper.style.height = (this.clipHeight * this.scale) + "px";
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}
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};
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/*
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Create the anchors
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*/
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InnerWikiWidget.prototype.createAnchors = function() {
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var self = this;
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this.findDataWidgets(this.children,"anchor",function(widget) {
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var anchorWidth = 40,
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anchorHeight = 40,
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getAnchorCoordinate = function(name) {
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return parseInt(self.wiki.getTiddlerText(widget.getAttribute(name)),10) || 0;
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},
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setAnchorCoordinate = function(name,value) {
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self.wiki.addTiddler({
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title: widget.getAttribute(name),
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text: value + ""
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});
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},
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domAnchor = dm("img",{
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document: self.document,
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style: {
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position: "absolute",
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width: anchorWidth + "px",
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height: anchorHeight + "px",
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transformOrigin: "50% 50%",
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transform: "scale(" + (1 / self.scale) + ")",
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left: (getAnchorCoordinate("x") - anchorWidth / 2) + "px",
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top: (getAnchorCoordinate("y") - anchorHeight / 2) + "px"
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},
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attributes: {
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draggable: false,
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src: "data:image/svg+xml," + encodeURIComponent(self.wiki.getTiddlerText("$:/plugins/tiddlywiki/innerwiki/crosshairs.svg"))
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}
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});
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self.domAnchorContainer.appendChild(domAnchor);
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var posX,posY,dragStartX,dragStartY,deltaX,deltaY,
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fnMouseDown = function(event) {
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self.domAnchorBackdrop.style.width = self.clipWidth + "px";
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self.domAnchorBackdrop.style.height = self.clipHeight + "px";
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self.domAnchorBackdrop.style.display = "block";
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posX = domAnchor.offsetLeft;
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posY = domAnchor.offsetTop;
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dragStartX = event.clientX;
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dragStartY = event.clientY;
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deltaX = 0;
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deltaY = 0;
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self.document.addEventListener("mousemove",fnMouseMove,false);
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self.document.addEventListener("mouseup",fnMouseUp,false);
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},
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fnMouseMove = function(event) {
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deltaX = (event.clientX - dragStartX) / self.scale;
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deltaY = (event.clientY - dragStartY) / self.scale;
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domAnchor.style.left = (posX + deltaX) + "px";
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domAnchor.style.top = (posY + deltaY) + "px";
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},
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fnMouseUp = function(event) {
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var x = getAnchorCoordinate("x") + deltaX,
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y = getAnchorCoordinate("y") + deltaY;
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if(x >= 0 && x < self.clipWidth && y >= 0 && y < self.clipHeight) {
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setAnchorCoordinate("x",x);
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setAnchorCoordinate("y",y);
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} else {
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domAnchor.style.left = posX + "px";
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domAnchor.style.top = posY + "px";
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}
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self.domAnchorBackdrop.style.display = "none";
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self.document.removeEventListener("mousemove",fnMouseMove,false);
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self.document.removeEventListener("mouseup",fnMouseUp,false);
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};
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domAnchor.addEventListener("mousedown",fnMouseDown,false);
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});
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};
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/*
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Delete the anchors
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*/
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InnerWikiWidget.prototype.deleteAnchors = function() {
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for(var index=this.domAnchorContainer.childNodes.length-1; index>=0; index--) {
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var node = this.domAnchorContainer.childNodes[index];
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if(node.tagName === "IMG") {
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node.parentNode.removeChild(node);
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}
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}
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};
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/*
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Create the HTML of the innerwiki
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*/
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InnerWikiWidget.prototype.createInnerHTML = function() {
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// Get the HTML of the iframe
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var html = this.wiki.renderTiddler("text/plain",this.innerWikiTemplate);
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// Insert the overlay tiddlers
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var SPLIT_MARKER = "<!--~~ Boot" + " kernel ~~-->\n",
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IMPLANT_PREFIX = "<" + "script>\n$tw.preloadTiddlerArray(",
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IMPLANT_SUFFIX = ");\n</" + "script>\n",
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parts = html.split(SPLIT_MARKER),
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tiddlers = this.readTiddlerDataWidgets(this.children);
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if(parts.length === 2) {
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html = parts[0] + IMPLANT_PREFIX + JSON.stringify(tiddlers) + IMPLANT_SUFFIX + SPLIT_MARKER + parts[1];
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}
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return html;
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};
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/*
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Find child data widgets
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*/
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InnerWikiWidget.prototype.findDataWidgets = function(children,tag,callback) {
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var self = this;
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$tw.utils.each(children,function(child) {
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if(child.dataWidgetTag === tag) {
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callback(child);
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}
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if(child.children) {
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self.findDataWidgets(child.children,tag,callback);
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}
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});
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};
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/*
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Find the child data widgets
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*/
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InnerWikiWidget.prototype.readTiddlerDataWidgets = function(children) {
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var self = this,
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results = [];
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this.findDataWidgets(children,"data",function(widget) {
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Array.prototype.push.apply(results,self.readTiddlerDataWidget(widget));
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});
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return results;
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};
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/*
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Read the value(s) from a data widget
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*/
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InnerWikiWidget.prototype.readTiddlerDataWidget = function(dataWidget) {
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// Start with a blank object
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var item = Object.create(null);
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// Read any attributes not prefixed with $
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$tw.utils.each(dataWidget.attributes,function(value,name) {
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if(name.charAt(0) !== "$") {
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item[name] = value;
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}
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});
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// Deal with $tiddler or $filter attributes
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var titles;
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if(dataWidget.hasAttribute("$tiddler")) {
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titles = [dataWidget.getAttribute("$tiddler")];
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} else if(dataWidget.hasAttribute("$filter")) {
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titles = this.wiki.filterTiddlers(dataWidget.getAttribute("$filter"));
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}
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if(titles) {
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var self = this;
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var results = [];
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$tw.utils.each(titles,function(title,index) {
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var tiddler = self.wiki.getTiddler(title),
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fields;
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if(tiddler) {
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fields = tiddler.getFieldStrings();
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}
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results.push($tw.utils.extend({},item,fields));
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})
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return results;
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} else {
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return [item];
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}
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};
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/*
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Compute the internal state of the widget
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*/
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InnerWikiWidget.prototype.execute = function() {
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var parseStringAsNumber = function(num,defaultValue) {
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num = parseInt(num + "",10);
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if(!isNaN(num)) {
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return num;
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} else {
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return parseInt(defaultValue + "",10);
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}
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};
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// Get our parameters
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this.innerWikiTemplate = this.getAttribute("template",DEFAULT_INNERWIKI_TEMPLATE);
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this.innerWikiWidth = parseStringAsNumber(this.getAttribute("width"),800);
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this.innerWikiHeight = parseStringAsNumber(this.getAttribute("height"),600);
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this.innerWikiStyle = this.getAttribute("style");
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this.innerWikiClass = this.getAttribute("class");
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this.innerWikiFilename = this.getAttribute("filename");
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this.innerWikiClipLeft = parseStringAsNumber(this.getAttribute("clipLeft"),0);
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this.innerWikiClipTop = parseStringAsNumber(this.getAttribute("clipTop"),0);
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this.innerWikiClipWidth = parseStringAsNumber(this.getAttribute("clipWidth"),this.innerWikiWidth);
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this.innerWikiClipHeight = parseStringAsNumber(this.getAttribute("clipHeight"),this.innerWikiHeight);
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// Construct the child widgets
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this.makeChildWidgets();
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};
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/*
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Selectively refreshes the widget if needed. Returns true if the widget or any of its children needed re-rendering
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*/
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InnerWikiWidget.prototype.refresh = function(changedTiddlers) {
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var changedAttributes = this.computeAttributes();
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if(changedAttributes.template || changedAttributes.width || changedAttributes.height || changedAttributes.style || changedAttributes.class) {
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this.refreshSelf();
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return true;
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} else {
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var childrenRefreshed = this.refreshChildren(changedTiddlers);
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if(childrenRefreshed) {
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this.deleteAnchors();
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this.createAnchors();
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}
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return childrenRefreshed
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}
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};
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/*
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Use Puppeteer to save a screenshot to a file
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*/
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InnerWikiWidget.prototype.saveScreenshot = function(options,callback) {
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var self = this,
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basepath = options.basepath || ".",
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deviceScaleFactor = options.deviceScaleFactor || 1;
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// Don't do anything if we don't have a filename
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if(!this.innerWikiFilename) {
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return callback(null);
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}
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var path = require("path"),
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filepath = path.resolve(basepath,this.innerWikiFilename);
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$tw.utils.createFileDirectories(filepath);
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console.log("Taking screenshot",filepath);
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// Fire up Puppeteer
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var puppeteer;
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try {
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puppeteer = require("puppeteer");
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} catch(e) {
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throw "Google Puppeteer not found";
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}
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// Take screenshots
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puppeteer.launch().then(async browser => {
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// NOTE: Copying Google's sample code by using new fangled promises "await"
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const page = await browser.newPage();
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await page.setContent(self.createInnerHTML(),{
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waitUntil: "domcontentloaded"
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});
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await page.setViewport({
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width: Math.trunc(self.innerWikiWidth),
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height: Math.trunc(self.innerWikiHeight),
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deviceScaleFactor: deviceScaleFactor
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});
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// PDF generation isn't great: there's no clipping, and pagination is hard to control
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// await page.emulateMedia("screen");
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// await page.pdf({
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// scale: 0.5,
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// width: self.innerWikiWidth + "px",
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// height: self.innerWikiHeight + "px",
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// path: filepath + ".pdf",
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// printBackground: true
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// });
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await page.screenshot({
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path: filepath,
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clip: {
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x: self.innerWikiClipLeft,
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y: self.innerWikiClipTop,
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width: self.innerWikiClipWidth,
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height: self.innerWikiClipHeight
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},
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type: "png"
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});
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await browser.close();
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callback(null);
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});
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};
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exports.innerwiki = InnerWikiWidget;
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})();
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