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Add: Eventcatcher widget (#5086)

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* Jeremy's original version of the event widget

* Renamed to eventcatcher, added modifier key support and mouse button support as variables

* Allow updating classname without re-rendering entire widget

* Handle tag attribute in refresh handler

* Improve handling for mouse button variable

* Fix typo in refresh handler

* Added variables for position of selected node and position of event relative to selected node and catcher node
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saqimtiaz 2020-11-22 21:47:12 +01:00 committed by GitHub
parent 51ca14861e
commit fa63ac5d1e
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1 changed files with 146 additions and 0 deletions
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core/modules/widgets/eventcatcher.js Normal file
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/*\
title: $:/core/modules/widgets/eventcatcher.js
type: application/javascript
module-type: widget
Event handler widget
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
var Widget = require("$:/core/modules/widgets/widget.js").widget;
var EventWidget = function(parseTreeNode,options) {
this.initialise(parseTreeNode,options);
};
/*
Inherit from the base widget class
*/
EventWidget.prototype = new Widget();
/*
Render this widget into the DOM
*/
EventWidget.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 tag = this.parseTreeNode.isBlock ? "div" : "span";
if(this.elementTag && $tw.config.htmlUnsafeElements.indexOf(this.elementTag) === -1) {
tag = this.elementTag;
}
var domNode = this.document.createElement(tag);
this.domNode = domNode;
// Assign classes
this.assignDomNodeClasses();
// Add our event handler
domNode.addEventListener(this.type,function(event) {
var selector = self.getAttribute("selector"),
actions = self.getAttribute("actions"),
selectedNode = event.target,
selectedNodeRect,
catcherNodeRect,
variables = {};
if(selector) {
// Search ancestors for a node that matches the selector
while(!selectedNode.matches(selector) && selectedNode !== domNode) {
selectedNode = selectedNode.parentNode;
}
// If we found one, copy the attributes as variables, otherwise exit
if(selectedNode.matches(selector)) {
$tw.utils.each(selectedNode.attributes,function(attribute) {
variables["dom-" + attribute.name] = attribute.value;
});
//Add a variable with a popup coordinate string for the selected node
variables["tv-popup-coords"] = "(" + selectedNode.offsetLeft + "," + selectedNode.offsetTop +"," + selectedNode.offsetWidth + "," + selectedNode.offsetHeight + ")";
//Add variables for offset of selected node
variables["tv-selectednode-posx"] = selectedNode.offsetLeft;
variables["tv-selectednode-posy"] = selectedNode.offsetTop;
variables["tv-selectednode-width"] = selectedNode.offsetWidth;
variables["tv-selectednode-height"] = selectedNode.offsetHeight;
//Add variables for event X and Y position relative to selected node
selectedNodeRect = selectedNode.getBoundingClientRect();
variables["event-fromselected-posx"] = event.clientX - selectedNodeRect.left;
variables["event-fromselected-posy"] = event.clientY - selectedNodeRect.top;
//Add variables for event X and Y position relative to event catcher node
catcherNodeRect = self.domNode.getBoundingClientRect();
variables["event-fromcatcher-posx"] = event.clientX - catcherNodeRect.left;
variables["event-fromcatcher-posy"] = event.clientY - catcherNodeRect.top;
} else {
return false;
}
}
// Execute our actions with the variables
if(actions) {
// Add a variable for the modifier key
variables.modifier = $tw.keyboardManager.getEventModifierKeyDescriptor(event);
// Add a variable for the mouse button
if("button" in event) {
if(event.button === 0) {
variables["event-mousebutton"] = "left";
} else if(event.button === 1) {
variables["event-mousebutton"] = "middle";
} else if(event.button === 2) {
variables["event-mousebutton"] = "right";
}
}
self.invokeActionString(actions,self,event,variables);
event.preventDefault();
event.stopPropagation();
return true;
}
return false;
},false);
// Insert element
parent.insertBefore(domNode,nextSibling);
this.renderChildren(domNode,null);
this.domNodes.push(domNode);
};
/*
Compute the internal state of the widget
*/
EventWidget.prototype.execute = function() {
var self = this;
// Get attributes that require a refresh on change
this.type = this.getAttribute("type");
this.elementTag = this.getAttribute("tag");
// Make child widgets
this.makeChildWidgets();
};
EventWidget.prototype.assignDomNodeClasses = function() {
var classes = this.getAttribute("class","").split(" ");
classes.push("tc-eventcatcher");
this.domNode.className = classes.join(" ");
};
/*
Selectively refreshes the widget if needed. Returns true if the widget or any of its children needed re-rendering
*/
EventWidget.prototype.refresh = function(changedTiddlers) {
var changedAttributes = this.computeAttributes();
if(changedAttributes.type || changedAttributes["tag"]) {
this.refreshSelf();
return true;
} else if(changedAttributes["class"]) {
this.assignDomNodeClasses();
}
return this.refreshChildren(changedTiddlers);
};
exports.eventcatcher = EventWidget;
})();