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TiddlyWiki5/core/modules/widgets/button.js

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/*\
title: $:/core/modules/widgets/button.js
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type: application/javascript
module-type: widget
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Button widget
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
var Widget = require("$:/core/modules/widgets/widget.js").widget;
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var ButtonWidget = function(parseTreeNode,options) {
this.initialise(parseTreeNode,options);
};
/*
Inherit from the base widget class
*/
ButtonWidget.prototype = new Widget();
/*
Render this widget into the DOM
*/
ButtonWidget.prototype.render = function(parent,nextSibling) {
var self = this;
// Remember parent
this.parentDomNode = parent;
// Compute attributes and execute state
this.computeAttributes();
this.execute();
// Create element
var domNode = this.document.createElement("button");
// Assign classes
var classes = this["class"].split(" ") || [];
if(this.selectedClass) {
if(this.set && this.setTo && this.isSelected()) {
$tw.utils.pushTop(classes,this.selectedClass.split(" "));
}
if(this.popup && this.isPoppedUp()) {
$tw.utils.pushTop(classes,this.selectedClass.split(" "));
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}
}
domNode.className = classes.join(" ");
// Assign other attributes
if(this.style) {
domNode.setAttribute("style",this.style);
}
if(this.title) {
domNode.setAttribute("title",this.title);
}
if(this["aria-label"]) {
domNode.setAttribute("aria-label",this["aria-label"]);
}
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// Add a click event handler
domNode.addEventListener("click",function (event) {
var handled = false;
if(self.to) {
self.navigateTo(event);
handled = true;
}
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if(self.message) {
self.dispatchMessage(event);
handled = true;
}
if(self.popup) {
self.triggerPopup(event);
handled = true;
}
if(self.set) {
self.setTiddler();
handled = true;
}
if(handled) {
event.preventDefault();
event.stopPropagation();
}
return handled;
},false);
// Insert element
parent.insertBefore(domNode,nextSibling);
this.renderChildren(domNode,null);
this.domNodes.push(domNode);
};
ButtonWidget.prototype.isSelected = function() {
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var tiddler = this.wiki.getTiddler(this.set);
return tiddler ? tiddler.fields.text === this.setTo : this.defaultSetValue === this.setTo;
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};
ButtonWidget.prototype.isPoppedUp = function() {
var tiddler = this.wiki.getTiddler(this.popup);
var result = tiddler && tiddler.fields.text ? $tw.popup.readPopupState(this.popup,tiddler.fields.text) : false;
return result;
};
ButtonWidget.prototype.navigateTo = function(event) {
var bounds = this.domNodes[0].getBoundingClientRect();
this.dispatchEvent({
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type: "tm-navigate",
navigateTo: this.to,
navigateFromTitle: this.getVariable("storyTiddler"),
navigateFromNode: this,
navigateFromClientRect: { top: bounds.top, left: bounds.left, width: bounds.width, right: bounds.right, bottom: bounds.bottom, height: bounds.height
},
navigateSuppressNavigation: event.metaKey || event.ctrlKey || (event.button === 1)
});
};
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ButtonWidget.prototype.dispatchMessage = function(event) {
this.dispatchEvent({type: this.message, param: this.param, tiddlerTitle: this.getVariable("currentTiddler")});
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};
ButtonWidget.prototype.triggerPopup = function(event) {
$tw.popup.triggerPopup({
domNode: this.domNodes[0],
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title: this.popup,
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wiki: this.wiki
});
};
ButtonWidget.prototype.setTiddler = function() {
this.wiki.setTextReference(this.set,this.setTo,this.getVariable("currentTiddler"));
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};
/*
Compute the internal state of the widget
*/
ButtonWidget.prototype.execute = function() {
// Get attributes
this.to = this.getAttribute("to");
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this.message = this.getAttribute("message");
this.param = this.getAttribute("param");
this.set = this.getAttribute("set");
this.setTo = this.getAttribute("setTo");
this.popup = this.getAttribute("popup");
this.hover = this.getAttribute("hover");
this["class"] = this.getAttribute("class","");
this["aria-label"] = this.getAttribute("aria-label");
this.title = this.getAttribute("title");
this.style = this.getAttribute("style");
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this.selectedClass = this.getAttribute("selectedClass");
this.defaultSetValue = this.getAttribute("default");
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// Make child widgets
this.makeChildWidgets();
};
/*
Selectively refreshes the widget if needed. Returns true if the widget or any of its children needed re-rendering
*/
ButtonWidget.prototype.refresh = function(changedTiddlers) {
var changedAttributes = this.computeAttributes();
if(changedAttributes.to || changedAttributes.message || changedAttributes.param || changedAttributes.set || changedAttributes.setTo || changedAttributes.popup || changedAttributes.hover || changedAttributes["class"] || changedAttributes.selectedClass || changedAttributes.style || (this.set && changedTiddlers[this.set]) || (this.popup && changedTiddlers[this.popup])) {
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this.refreshSelf();
return true;
}
return this.refreshChildren(changedTiddlers);
};
exports.button = ButtonWidget;
})();