139 lines
4.0 KiB
JavaScript
139 lines
4.0 KiB
JavaScript
/*\
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title: $:/core/modules/widgets/keyboard.js
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type: application/javascript
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module-type: widget
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Keyboard shortcut widget
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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var Widget = require("$:/core/modules/widgets/widget.js").widget;
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var KeyboardWidget = function(parseTreeNode,options) {
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options.hasDom = true;
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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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KeyboardWidget.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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KeyboardWidget.prototype.render = function(parent,nextSibling) {
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var self = this;
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// Remember parent
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this.parentDomNode = parent;
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// Compute attributes and execute state
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this.computeAttributes();
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this.execute();
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var tag = this.parseTreeNode.isBlock ? "div" : "span";
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if(this.tag && $tw.config.htmlUnsafeElements.indexOf(this.tag) === -1) {
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tag = this.tag;
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}
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// Create element
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var domNode = this.document.createElement(tag);
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// Assign classes
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this.domNode = domNode;
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this.assignDomNodeClasses();
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// Add a keyboard event handler
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$tw.utils.addEventListeners(domNode,[
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{name: "keydown", handlerObject: this, handlerMethod: "handleChangeEvent"}
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]);
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// Insert element
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parent.insertBefore(domNode,nextSibling);
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this.renderChildren(domNode,null);
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this.domNodes.push(domNode);
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};
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KeyboardWidget.prototype.handleChangeEvent = function(event) {
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if($tw.keyboardManager.handleKeydownEvent(event, {onlyPriority: true})) {
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return true;
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}
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var keyInfo = $tw.keyboardManager.getMatchingKeyDescriptor(event,this.keyInfoArray);
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if(keyInfo) {
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var handled = this.invokeActions(this,event);
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if(this.actions) {
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var variables = {
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"event-key": event.key,
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"event-code": event.code,
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"modifier": $tw.keyboardManager.getEventModifierKeyDescriptor(event)
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};
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if(keyInfo.keyDescriptor) {
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variables["event-key-descriptor"] = keyInfo.keyDescriptor;
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}
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this.invokeActionString(this.actions,this,event,variables);
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}
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this.dispatchMessage(event);
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if(handled || this.actions || this.message) {
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event.preventDefault();
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event.stopPropagation();
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}
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return true;
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}
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return false;
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}
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KeyboardWidget.prototype.dispatchMessage = function(event) {
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this.dispatchEvent({type: this.message, param: this.param, tiddlerTitle: this.getVariable("currentTiddler")});
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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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KeyboardWidget.prototype.execute = function() {
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var self = this;
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// Get attributes
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this.actions = this.getAttribute("actions","");
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this.message = this.getAttribute("message","");
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this.param = this.getAttribute("param","");
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this.key = this.getAttribute("key","");
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this.tag = this.getAttribute("tag","");
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this.keyInfoArray = $tw.keyboardManager.parseKeyDescriptors(this.key);
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if(this.key.substr(0,2) === "((" && this.key.substr(-2,2) === "))") {
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this.shortcutTiddlers = [];
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var name = this.key.substring(2,this.key.length -2);
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$tw.utils.each($tw.keyboardManager.lookupNames,function(platformDescriptor) {
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self.shortcutTiddlers.push("$:/config/" + platformDescriptor + "/" + name);
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});
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}
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// Make child widgets
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this.makeChildWidgets();
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};
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KeyboardWidget.prototype.assignDomNodeClasses = function() {
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var classes = this.getAttribute("class","").split(" ");
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classes.push("tc-keyboard");
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this.domNode.className = classes.join(" ");
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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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KeyboardWidget.prototype.refresh = function(changedTiddlers) {
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var changedAttributes = this.computeAttributes();
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if(changedAttributes.message || changedAttributes.param || changedAttributes.key || changedAttributes.tag) {
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this.refreshSelf();
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return true;
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} else if(changedAttributes["class"]) {
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this.assignDomNodeClasses();
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}
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// Update the keyInfoArray if one of its shortcut-config-tiddlers has changed
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if(this.shortcutTiddlers && $tw.utils.hopArray(changedTiddlers,this.shortcutTiddlers)) {
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this.keyInfoArray = $tw.keyboardManager.parseKeyDescriptors(this.key);
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}
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return this.refreshChildren(changedTiddlers);
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};
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exports.keyboard = KeyboardWidget;
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})();
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