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Add support for widget subclassing

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Fixes #3865
This commit is contained in:
Jermolene
2019-03-17 12:25:15 +00:00
parent a89991cc46
commit e52a616891
2 changed files with 73 additions and 3 deletions
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22
core/modules/widgets/widget.js
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@@ -22,15 +22,17 @@ Options include:
document: optional document object to use instead of global document
*/
var Widget = function(parseTreeNode,options) {
if(arguments.length > 0) {
this.initialise(parseTreeNode,options);
}
this.initialise(parseTreeNode,options);
};
/*
Initialise widget properties. These steps are pulled out of the constructor so that we can reuse them in subclasses
*/
Widget.prototype.initialise = function(parseTreeNode,options) {
// Bail if parseTreeNode is undefined, meaning that the widget constructor was called without any arguments so that it can be subclassed
if(parseTreeNode === undefined) {
return;
}
options = options || {};
// Save widget info
this.parseTreeNode = parseTreeNode;
@@ -46,7 +48,21 @@ Widget.prototype.initialise = function(parseTreeNode,options) {
this.eventListeners = {};
// Hashmap of the widget classes
if(!this.widgetClasses) {
// Get widget classes
Widget.prototype.widgetClasses = $tw.modules.applyMethods("widget");
// Process any subclasses
$tw.modules.forEachModuleOfType("widget-subclass",function(title,module) {
if(module.baseClass) {
var baseClass = Widget.prototype.widgetClasses[module.baseClass];
if(!baseClass) {
throw "Module '" + title + "' is attemping to extend a non-existent base class '" + module.baseClass + "'";
}
var subClass = module.constructor;
subClass.prototype = new baseClass();
$tw.utils.extend(subClass.prototype,module.prototype);
Widget.prototype.widgetClasses[module.name || module.baseClass] = subClass;
}
});
}
};