mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-11-19 16:24:51 +00:00
121 lines
3.5 KiB
JavaScript
121 lines
3.5 KiB
JavaScript
/*\
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title: $:/core/modules/widgets/view.js
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type: application/javascript
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module-type: widget
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The view widget displays a tiddler field.
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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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/*
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Define the "text" viewer here so that it is always available
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*/
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var TextViewer = function(viewWidget,tiddler,field,value) {
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this.viewWidget = viewWidget;
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this.tiddler = tiddler;
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this.field = field;
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this.value = value;
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};
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TextViewer.prototype.render = function() {
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// Get the value as a string
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if(this.field !== "text" && this.tiddler) {
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this.value = this.tiddler.getFieldString(this.field);
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}
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var value = "";
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if(this.value !== undefined && this.value !== null) {
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value = this.value;
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}
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// Set the element details
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this.viewWidget.tag = "span";
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this.viewWidget.attributes = {};
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this.viewWidget.children = this.viewWidget.renderer.renderTree.createRenderers(this.viewWidget.renderer.renderContext,[{
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type: "text",
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text: value
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}]);
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};
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var ViewWidget = function(renderer) {
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// Save state
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this.renderer = renderer;
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// Initialise the field viewers if they've not been done already
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if(!this.fieldViewers) {
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ViewWidget.prototype.fieldViewers = {text: TextViewer}; // Start with the built-in text viewer
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$tw.modules.applyMethods("fieldviewer",this.fieldViewers);
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}
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// Generate child nodes
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this.generate();
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};
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ViewWidget.prototype.generate = function() {
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// Get parameters from our attributes
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this.tiddlerTitle = this.renderer.getAttribute("tiddler",this.renderer.getContextTiddlerTitle());
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this.fieldName = this.renderer.getAttribute("field","text");
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this.format = this.renderer.getAttribute("format","text");
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// Get the value to display
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var tiddler = this.renderer.renderTree.wiki.getTiddler(this.tiddlerTitle),
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value;
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if(tiddler) {
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if(this.fieldName === "text") {
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// Calling getTiddlerText() triggers lazy loading of skinny tiddlers
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value = this.renderer.renderTree.wiki.getTiddlerText(this.tiddlerTitle);
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} else {
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value = tiddler.fields[this.fieldName];
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}
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} else { // Use a special value if the tiddler is missing
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switch(this.fieldName) {
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case "title":
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value = this.tiddlerTitle;
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break;
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case "modified":
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case "created":
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value = new Date();
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break;
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default:
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value = "";
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break;
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}
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}
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// Choose the viewer to use
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var Viewer = this.fieldViewers.text;
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if($tw.utils.hop(this.fieldViewers,this.format)) {
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Viewer = this.fieldViewers[this.format];
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}
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this.viewer = new Viewer(this,tiddler,this.fieldName,value);
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// Ask the viewer to create the widget element
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this.viewer.render();
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};
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ViewWidget.prototype.refreshInDom = function(changedAttributes,changedTiddlers) {
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// Check if any of our attributes have changed, or if a tiddler we're interested in has changed
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if(changedAttributes.tiddler || changedAttributes.field || changedAttributes.format || (this.tiddlerTitle && changedTiddlers[this.tiddlerTitle])) {
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// Regenerate and rerender the widget and replace the existing DOM node
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this.generate();
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var oldDomNode = this.renderer.domNode,
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newDomNode = this.renderer.renderInDom();
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oldDomNode.parentNode.replaceChild(newDomNode,oldDomNode);
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} else {
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// We don't need to refresh ourselves, so just refresh any child nodes
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$tw.utils.each(this.children,function(node) {
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if(node.refreshInDom) {
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node.refreshInDom(changedTiddlers);
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}
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});
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}
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};
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ViewWidget.prototype.postRenderInDom = function() {
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if(this.viewer && this.viewer.postRenderInDom) {
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this.viewer.postRenderInDom();
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}
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};
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exports.view = ViewWidget;
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})();
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