mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-11-16 23:04:50 +00:00
848 lines
27 KiB
JavaScript
Executable File
848 lines
27 KiB
JavaScript
Executable File
/*\
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title: $:/core/modules/widgets/widget.js
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type: application/javascript
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module-type: widget
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Widget base class
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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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/* Maximum permitted depth of the widget tree for recursion detection */
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var MAX_WIDGET_TREE_DEPTH = 1000;
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/*
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Create a widget object for a parse tree node
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parseTreeNode: reference to the parse tree node to be rendered
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options: see below
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Options include:
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wiki: mandatory reference to wiki associated with this render tree
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parentWidget: optional reference to a parent renderer node for the context chain
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document: optional document object to use instead of global document
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*/
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var Widget = function(parseTreeNode,options) {
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this.initialise(parseTreeNode,options);
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};
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/*
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Initialise widget properties. These steps are pulled out of the constructor so that we can reuse them in subclasses
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*/
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Widget.prototype.initialise = function(parseTreeNode,options) {
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// Bail if parseTreeNode is undefined, meaning that the widget constructor was called without any arguments so that it can be subclassed
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if(parseTreeNode === undefined) {
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return;
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}
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options = options || {};
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// Save widget info
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this.parseTreeNode = parseTreeNode;
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this.wiki = options.wiki;
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this.parentWidget = options.parentWidget;
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this.variables = Object.create(this.parentWidget ? this.parentWidget.variables : null);
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this.document = options.document;
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this.attributes = {};
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this.children = [];
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this.domNodes = [];
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this.eventListeners = {};
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// Hashmap of the widget classes
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if(!this.widgetClasses) {
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// Get widget classes
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Widget.prototype.widgetClasses = $tw.modules.applyMethods("widget");
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// Process any subclasses
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$tw.modules.forEachModuleOfType("widget-subclass",function(title,module) {
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if(module.baseClass) {
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var baseClass = Widget.prototype.widgetClasses[module.baseClass];
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if(!baseClass) {
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throw "Module '" + title + "' is attemping to extend a non-existent base class '" + module.baseClass + "'";
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}
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var subClass = module.constructor;
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subClass.prototype = new baseClass();
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$tw.utils.extend(subClass.prototype,module.prototype);
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Widget.prototype.widgetClasses[module.name || module.baseClass] = subClass;
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}
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});
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}
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};
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/*
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Render this widget into the DOM
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*/
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Widget.prototype.render = function(parent,nextSibling) {
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this.parentDomNode = parent;
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this.execute();
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this.renderChildren(parent,nextSibling);
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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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Widget.prototype.execute = function() {
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this.makeChildWidgets();
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};
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/*
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Set the value of a context variable
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name: name of the variable
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value: value of the variable
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params: array of {name:, default:} for each parameter
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isMacroDefinition: true if the variable is set via a \define macro pragma (and hence should have variable substitution performed)
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options includes:
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isProcedureDefinition: true if the variable is set via a \procedure pragma (and hence should not have variable substitution performed)
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isFunctionDefinition: true if the variable is set via a \function pragma (and hence should not have variable substitution performed)
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isWidgetDefinition: true if the variable is set via a \widget pragma (and hence should not have variable substitution performed)
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*/
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Widget.prototype.setVariable = function(name,value,params,isMacroDefinition,options) {
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options = options || {};
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this.variables[name] = {
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value: value,
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params: params,
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isMacroDefinition: !!isMacroDefinition,
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isFunctionDefinition: !!options.isFunctionDefinition,
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isProcedureDefinition: !!options.isProcedureDefinition,
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isWidgetDefinition: !!options.isWidgetDefinition,
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configTrimWhiteSpace: !!options.configTrimWhiteSpace
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};
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};
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/*
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Get the prevailing value of a context variable
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name: name of variable
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options: see below
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Options include
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params: array of {name:, value:} for each parameter
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defaultValue: default value if the variable is not defined
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source: optional source iterator for evaluating function invocations
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allowSelfAssigned: if true, includes the current widget in the context chain instead of just the parent
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Returns an object with the following fields:
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params: array of {name:,value:} or {value:} of parameters to be applied
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text: text of variable, with parameters properly substituted
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resultList: result of variable evaluation as an array
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srcVariable: reference to the object defining the variable
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*/
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Widget.prototype.getVariableInfo = function(name,options) {
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options = options || {};
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var self = this,
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actualParams = options.params || [],
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variable;
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if(options.allowSelfAssigned) {
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variable = this.variables[name];
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} else {
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variable = this.parentWidget && this.parentWidget.variables[name];
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}
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// Check for the variable defined in the parent widget (or an ancestor in the prototype chain)
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if(variable) {
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var originalValue = variable.value,
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value = originalValue,
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params = [],
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resultList = [value];
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// Only substitute parameter and variable references if this variable was defined with the \define pragma
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if(variable.isMacroDefinition) {
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params = self.resolveVariableParameters(variable.params,actualParams);
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// Substitute any parameters specified in the definition
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$tw.utils.each(params,function(param) {
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value = $tw.utils.replaceString(value,new RegExp("\\$" + $tw.utils.escapeRegExp(param.name) + "\\$","mg"),param.value);
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});
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value = self.substituteVariableReferences(value,options);
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resultList = [value];
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} else if(variable.isFunctionDefinition) {
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// Function evaluations
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params = self.resolveVariableParameters(variable.params,actualParams);
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var variables = options.variables || Object.create(null);
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// Apply default parameter values
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$tw.utils.each(variable.params,function(param,index) {
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if(param["default"]) {
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variables[param.name] = param["default"];
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}
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});
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// Parameters are an array of {value:} or {name:, value:} pairs
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$tw.utils.each(params,function(param) {
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variables[param.name] = param.value;
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});
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resultList = this.wiki.filterTiddlers(value,this.makeFakeWidgetWithVariables(variables),options.source);
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value = resultList[0] || "";
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}
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return {
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text: value,
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params: params,
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resultList: resultList,
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srcVariable: variable,
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isCacheable: originalValue === value
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};
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}
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// If the variable doesn't exist in the parent widget then look for a macro module
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var text = this.evaluateMacroModule(name,actualParams);
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if(text === undefined) {
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text = options.defaultValue;
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}
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return {
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text: text,
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resultList: [text]
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};
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};
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/*
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Simplified version of getVariableInfo() that just returns the text
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*/
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Widget.prototype.getVariable = function(name,options) {
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return this.getVariableInfo(name,options).text;
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};
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/*
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Maps actual parameters onto formal parameters, returning an array of {name:,value:} objects
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formalParams - Array of {name:,default:} (default value is optional)
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actualParams - Array of string values or {name:,value:} (name is optional)
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*/
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Widget.prototype.resolveVariableParameters = function(formalParams,actualParams) {
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formalParams = formalParams || [];
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actualParams = actualParams || [];
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var nextAnonParameter = 0, // Next candidate anonymous parameter in macro call
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paramInfo, paramValue,
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results = [];
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// Step through each of the parameters in the macro definition
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for(var p=0; p<formalParams.length; p++) {
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// Check if we've got a macro call parameter with the same name
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paramInfo = formalParams[p];
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paramValue = undefined;
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for(var m=0; m<actualParams.length; m++) {
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if(typeof actualParams[m] !== "string" && actualParams[m].name === paramInfo.name) {
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paramValue = actualParams[m].value;
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}
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}
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// If not, use the next available anonymous macro call parameter
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while(nextAnonParameter < actualParams.length && actualParams[nextAnonParameter].name) {
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nextAnonParameter++;
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}
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if(paramValue === undefined && nextAnonParameter < actualParams.length) {
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var param = actualParams[nextAnonParameter++];
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paramValue = typeof param === "string" ? param : param.value;
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}
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// If we've still not got a value, use the default, if any
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paramValue = paramValue || paramInfo["default"] || "";
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// Store the parameter name and value
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results.push({name: paramInfo.name, value: paramValue});
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}
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return results;
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};
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Widget.prototype.substituteVariableReferences = function(text,options) {
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var self = this;
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return (text || "").replace(/\$\(([^\)\$]+)\)\$/g,function(match,p1,offset,string) {
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return options.variables && options.variables[p1] || (self.getVariable(p1,{defaultValue: ""}));
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});
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};
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Widget.prototype.evaluateMacroModule = function(name,actualParams,defaultValue) {
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if($tw.utils.hop($tw.macros,name)) {
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var macro = $tw.macros[name],
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args = [];
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if(macro.params.length > 0) {
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var nextAnonParameter = 0, // Next candidate anonymous parameter in macro call
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paramInfo, paramValue;
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// Step through each of the parameters in the macro definition
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for(var p=0; p<macro.params.length; p++) {
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// Check if we've got a macro call parameter with the same name
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paramInfo = macro.params[p];
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paramValue = undefined;
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for(var m=0; m<actualParams.length; m++) {
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if(actualParams[m].name === paramInfo.name) {
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paramValue = actualParams[m].value;
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}
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}
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// If not, use the next available anonymous macro call parameter
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while(nextAnonParameter < actualParams.length && actualParams[nextAnonParameter].name) {
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nextAnonParameter++;
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}
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if(paramValue === undefined && nextAnonParameter < actualParams.length) {
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paramValue = actualParams[nextAnonParameter++].value;
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}
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// If we've still not got a value, use the default, if any
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paramValue = paramValue || paramInfo["default"] || "";
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// Save the parameter
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args.push(paramValue);
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}
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}
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else for(var i=0; i<actualParams.length; ++i) {
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args.push(actualParams[i].value);
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}
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return (macro.run.apply(this,args) || "").toString();
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} else {
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return defaultValue;
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}
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};
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/*
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Check whether a given context variable value exists in the parent chain
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*/
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Widget.prototype.hasVariable = function(name,value) {
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var node = this;
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while(node) {
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if($tw.utils.hop(node.variables,name) && node.variables[name].value === value) {
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return true;
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}
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node = node.parentWidget;
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}
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return false;
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};
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/*
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Construct a qualifying string based on a hash of concatenating the values of a given variable in the parent chain
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*/
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Widget.prototype.getStateQualifier = function(name) {
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this.qualifiers = this.qualifiers || Object.create(null);
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name = name || "transclusion";
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if(this.qualifiers[name]) {
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return this.qualifiers[name];
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} else {
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var output = [],
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node = this;
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while(node && node.parentWidget) {
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if($tw.utils.hop(node.parentWidget.variables,name)) {
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output.push(node.getVariable(name));
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}
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node = node.parentWidget;
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}
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var value = $tw.utils.hashString(output.join(""));
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this.qualifiers[name] = value;
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return value;
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}
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};
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/*
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Make a fake widget with specified variables, suitable for variable lookup in filters
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*/
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Widget.prototype.makeFakeWidgetWithVariables = function(variables) {
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var self = this;
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return {
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getVariable: function(name,opts) {
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if($tw.utils.hop(variables,name)) {
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return variables[name];
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} else {
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opts = opts || {};
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opts.variables = variables;
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return self.getVariable(name,opts);
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};
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},
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getVariableInfo: function(name,opts) {
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if($tw.utils.hop(variables,name)) {
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return {
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text: variables[name]
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};
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} else {
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opts = opts || {};
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opts.variables = variables;
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return self.getVariableInfo(name,opts);
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};
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},
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makeFakeWidgetWithVariables: self.makeFakeWidgetWithVariables,
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resolveVariableParameters: self.resolveVariableParameters,
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wiki: self.wiki
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};
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};
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/*
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Compute the current values of the attributes of the widget. Returns a hashmap of the names of the attributes that have changed.
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Options include:
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filterFn: only include attributes where filterFn(name) returns true
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*/
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Widget.prototype.computeAttributes = function(options) {
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options = options || {};
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var changedAttributes = {},
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self = this;
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$tw.utils.each(this.parseTreeNode.attributes,function(attribute,name) {
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if(options.filterFn) {
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if(!options.filterFn(name)) {
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return;
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}
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}
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var value = self.computeAttribute(attribute);
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if(self.attributes[name] !== value) {
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self.attributes[name] = value;
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changedAttributes[name] = true;
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}
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});
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return changedAttributes;
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};
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Widget.prototype.computeAttribute = function(attribute) {
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var self = this,
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value;
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if(attribute.type === "filtered") {
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value = this.wiki.filterTiddlers(attribute.filter,this)[0] || "";
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} else if(attribute.type === "indirect") {
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value = this.wiki.getTextReference(attribute.textReference,"",this.getVariable("currentTiddler")) || "";
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} else if(attribute.type === "macro") {
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var variableInfo = this.getVariableInfo(attribute.value.name,{params: attribute.value.params});
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value = variableInfo.text;
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} else if(attribute.type === "substituted") {
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value = this.wiki.getSubstitutedText(attribute.rawValue,this) || "";
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} else { // String attribute
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value = attribute.value;
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}
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return value;
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};
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/*
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Check for the presence of an evaluated attribute on the widget. Note that attributes set to a missing variable (ie attr=<<missing>>) will be treated as missing
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*/
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Widget.prototype.hasAttribute = function(name) {
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return $tw.utils.hop(this.attributes,name);
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};
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/*
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Check for the presence of a raw attribute on the widget parse tree node. Note that attributes set to a missing variable (ie attr=<<missing>>) will NOT be treated as missing
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*/
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Widget.prototype.hasParseTreeNodeAttribute = function(name) {
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return $tw.utils.hop(this.parseTreeNode.attributes,name);
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};
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/*
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Get the value of an attribute
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*/
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Widget.prototype.getAttribute = function(name,defaultText) {
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if($tw.utils.hop(this.attributes,name)) {
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return this.attributes[name];
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} else {
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return defaultText;
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}
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};
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/*
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Assign the common attributes of the widget to a domNode
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options include:
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sourcePrefix: prefix of attributes that are to be directly assigned (defaults to the empty string meaning all attributes)
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destPrefix: prefix to be applied to attribute names that are to be directly assigned (defaults to the emtpy string which means no prefix is added)
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changedAttributes: hashmap by attribute name of attributes to process (if missing, process all attributes)
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excludeEventAttributes: ignores attributes whose name would begin with "on"
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*/
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Widget.prototype.assignAttributes = function(domNode,options) {
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options = options || {};
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var self = this,
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changedAttributes = options.changedAttributes || this.attributes,
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sourcePrefix = options.sourcePrefix || "",
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destPrefix = options.destPrefix || "",
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EVENT_ATTRIBUTE_PREFIX = "on";
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var assignAttribute = function(name,value) {
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// Process any style attributes before considering sourcePrefix and destPrefix
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if(name.substr(0,6) === "style." && name.length > 6) {
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domNode.style[$tw.utils.unHyphenateCss(name.substr(6))] = value;
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return;
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}
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// Check if the sourcePrefix is a match
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if(name.substr(0,sourcePrefix.length) === sourcePrefix) {
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name = destPrefix + name.substr(sourcePrefix.length);
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} else {
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value = undefined;
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}
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// Check for excluded attribute names
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if(options.excludeEventAttributes && name.substr(0,2).toLowerCase() === EVENT_ATTRIBUTE_PREFIX) {
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value = undefined;
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}
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if(value !== undefined) {
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// Handle the xlink: namespace
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var namespace = null;
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if(name.substr(0,6) === "xlink:" && name.length > 6) {
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namespace = "http://www.w3.org/1999/xlink";
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name = name.substr(6);
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}
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// Setting certain attributes can cause a DOM error (eg xmlns on the svg element)
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try {
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domNode.setAttributeNS(namespace,name,value);
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} catch(e) {
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}
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}
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};
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// If the parse tree node has the orderedAttributes property then use that order
|
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if(this.parseTreeNode.orderedAttributes) {
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$tw.utils.each(this.parseTreeNode.orderedAttributes,function(attribute,index) {
|
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if(attribute.name in changedAttributes) {
|
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assignAttribute(attribute.name,self.getAttribute(attribute.name));
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}
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});
|
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// Otherwise update each changed attribute irrespective of order
|
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} else {
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$tw.utils.each(changedAttributes,function(value,name) {
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assignAttribute(name,self.getAttribute(name));
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});
|
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}
|
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};
|
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|
|
/*
|
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Get the number of ancestor widgets for this widget
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*/
|
|
Widget.prototype.getAncestorCount = function() {
|
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if(this.ancestorCount === undefined) {
|
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if(this.parentWidget) {
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this.ancestorCount = this.parentWidget.getAncestorCount() + 1;
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} else {
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this.ancestorCount = 0;
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}
|
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}
|
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return this.ancestorCount;
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};
|
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|
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/*
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Make child widgets correspondng to specified parseTreeNodes
|
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*/
|
|
Widget.prototype.makeChildWidgets = function(parseTreeNodes,options) {
|
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options = options || {};
|
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this.children = [];
|
|
var self = this;
|
|
// Check for too much recursion
|
|
if(this.getAncestorCount() > MAX_WIDGET_TREE_DEPTH) {
|
|
this.children.push(this.makeChildWidget({type: "error", attributes: {
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"$message": {type: "string", value: $tw.language.getString("Error/RecursiveTransclusion")}
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|
}}));
|
|
} else {
|
|
// Create set variable widgets for each variable
|
|
$tw.utils.each(options.variables,function(value,name) {
|
|
var setVariableWidget = {
|
|
type: "set",
|
|
attributes: {
|
|
name: {type: "string", value: name},
|
|
value: {type: "string", value: value}
|
|
},
|
|
children: parseTreeNodes
|
|
};
|
|
parseTreeNodes = [setVariableWidget];
|
|
});
|
|
// Create the child widgets
|
|
$tw.utils.each(parseTreeNodes || (this.parseTreeNode && this.parseTreeNode.children),function(childNode) {
|
|
self.children.push(self.makeChildWidget(childNode));
|
|
});
|
|
}
|
|
};
|
|
|
|
/*
|
|
Construct the widget object for a parse tree node
|
|
options include:
|
|
variables: optional hashmap of variables to wrap around the widget
|
|
*/
|
|
Widget.prototype.makeChildWidget = function(parseTreeNode,options) {
|
|
var self = this;
|
|
options = options || {};
|
|
// Check whether this node type is defined by a custom widget definition
|
|
var variableDefinitionName = "$" + parseTreeNode.type;
|
|
if(this.variables[variableDefinitionName]) {
|
|
var isOverrideable = function() {
|
|
// Widget is overrideable if its name contains a period, or if it is an existing JS widget and we're not in safe mode
|
|
return parseTreeNode.type.indexOf(".") !== -1 || (!!self.widgetClasses[parseTreeNode.type] && !$tw.safeMode);
|
|
};
|
|
if(!parseTreeNode.isNotRemappable && isOverrideable()) {
|
|
var variableInfo = this.getVariableInfo(variableDefinitionName,{allowSelfAssigned: true});
|
|
if(variableInfo && variableInfo.srcVariable && variableInfo.srcVariable.value && variableInfo.srcVariable.isWidgetDefinition) {
|
|
var newParseTreeNode = {
|
|
type: "transclude",
|
|
children: parseTreeNode.children,
|
|
isBlock: parseTreeNode.isBlock
|
|
};
|
|
$tw.utils.addAttributeToParseTreeNode(newParseTreeNode,"$variable",variableDefinitionName);
|
|
$tw.utils.each(parseTreeNode.attributes,function(attr,name) {
|
|
// If the attribute starts with a dollar then add an extra dollar so that it doesn't clash with the $xxx attributes of transclude
|
|
name = name.charAt(0) === "$" ? "$" + name : name;
|
|
$tw.utils.addAttributeToParseTreeNode(newParseTreeNode,$tw.utils.extend({},attr,{name: name}));
|
|
});
|
|
parseTreeNode = newParseTreeNode;
|
|
}
|
|
}
|
|
}
|
|
// Get the widget class for this node type
|
|
var WidgetClass = this.widgetClasses[parseTreeNode.type];
|
|
if(!WidgetClass) {
|
|
WidgetClass = this.widgetClasses.text;
|
|
parseTreeNode = {type: "text", text: "Undefined widget '" + parseTreeNode.type + "'"};
|
|
}
|
|
// Create set variable widgets for each variable
|
|
$tw.utils.each(options.variables,function(value,name) {
|
|
var setVariableWidget = {
|
|
type: "set",
|
|
attributes: {
|
|
name: {type: "string", value: name},
|
|
value: {type: "string", value: value}
|
|
},
|
|
children: [
|
|
parseTreeNode
|
|
]
|
|
};
|
|
parseTreeNode = setVariableWidget;
|
|
});
|
|
return new WidgetClass(parseTreeNode,{
|
|
wiki: this.wiki,
|
|
parentWidget: this,
|
|
document: this.document
|
|
});
|
|
};
|
|
|
|
/*
|
|
Get the next sibling of this widget
|
|
*/
|
|
Widget.prototype.nextSibling = function() {
|
|
if(this.parentWidget) {
|
|
var index = this.parentWidget.children.indexOf(this);
|
|
if(index !== -1 && index < this.parentWidget.children.length-1) {
|
|
return this.parentWidget.children[index+1];
|
|
}
|
|
}
|
|
return null;
|
|
};
|
|
|
|
/*
|
|
Get the previous sibling of this widget
|
|
*/
|
|
Widget.prototype.previousSibling = function() {
|
|
if(this.parentWidget) {
|
|
var index = this.parentWidget.children.indexOf(this);
|
|
if(index !== -1 && index > 0) {
|
|
return this.parentWidget.children[index-1];
|
|
}
|
|
}
|
|
return null;
|
|
};
|
|
|
|
/*
|
|
Render the children of this widget into the DOM
|
|
*/
|
|
Widget.prototype.renderChildren = function(parent,nextSibling) {
|
|
var children = this.children;
|
|
for(var i = 0; i < children.length; i++) {
|
|
children[i].render(parent,nextSibling);
|
|
};
|
|
};
|
|
|
|
/*
|
|
Add a list of event listeners from an array [{type:,handler:},...]
|
|
*/
|
|
Widget.prototype.addEventListeners = function(listeners) {
|
|
var self = this;
|
|
$tw.utils.each(listeners,function(listenerInfo) {
|
|
self.addEventListener(listenerInfo.type,listenerInfo.handler);
|
|
});
|
|
};
|
|
|
|
/*
|
|
Add an event listener
|
|
*/
|
|
Widget.prototype.addEventListener = function(type,handler) {
|
|
var self = this;
|
|
if(typeof handler === "string") { // The handler is a method name on this widget
|
|
this.eventListeners[type] = function(event) {
|
|
return self[handler].call(self,event);
|
|
};
|
|
} else { // The handler is a function
|
|
this.eventListeners[type] = function(event) {
|
|
return handler.call(self,event);
|
|
};
|
|
}
|
|
};
|
|
|
|
/*
|
|
Dispatch an event to a widget. If the widget doesn't handle the event then it is also dispatched to the parent widget
|
|
*/
|
|
Widget.prototype.dispatchEvent = function(event) {
|
|
event.widget = event.widget || this;
|
|
// Dispatch the event if this widget handles it
|
|
var listener = this.eventListeners[event.type];
|
|
if(listener) {
|
|
// Don't propagate the event if the listener returned false
|
|
if(!listener(event)) {
|
|
return false;
|
|
}
|
|
}
|
|
// Dispatch the event to the parent widget
|
|
if(this.parentWidget) {
|
|
return this.parentWidget.dispatchEvent(event);
|
|
}
|
|
return true;
|
|
};
|
|
|
|
/*
|
|
Selectively refreshes the widget if needed. Returns true if the widget or any of its children needed re-rendering
|
|
*/
|
|
Widget.prototype.refresh = function(changedTiddlers) {
|
|
return this.refreshChildren(changedTiddlers);
|
|
};
|
|
|
|
/*
|
|
Rebuild a previously rendered widget
|
|
*/
|
|
Widget.prototype.refreshSelf = function() {
|
|
var nextSibling = this.findNextSiblingDomNode();
|
|
this.removeChildDomNodes();
|
|
this.render(this.parentDomNode,nextSibling);
|
|
};
|
|
|
|
/*
|
|
Refresh all the children of a widget
|
|
*/
|
|
Widget.prototype.refreshChildren = function(changedTiddlers) {
|
|
var children = this.children,
|
|
refreshed = false;
|
|
for (var i = 0; i < children.length; i++) {
|
|
refreshed = children[i].refresh(changedTiddlers) || refreshed;
|
|
}
|
|
return refreshed;
|
|
};
|
|
|
|
/*
|
|
Find the next sibling in the DOM to this widget. This is done by scanning the widget tree through all next siblings and their descendents that share the same parent DOM node
|
|
*/
|
|
Widget.prototype.findNextSiblingDomNode = function(startIndex) {
|
|
// Refer to this widget by its index within its parents children
|
|
var parent = this.parentWidget,
|
|
index = startIndex !== undefined ? startIndex : parent.children.indexOf(this);
|
|
if(index === -1) {
|
|
throw "node not found in parents children";
|
|
}
|
|
// Look for a DOM node in the later siblings
|
|
while(++index < parent.children.length) {
|
|
var domNode = parent.children[index].findFirstDomNode();
|
|
if(domNode) {
|
|
return domNode;
|
|
}
|
|
}
|
|
// Go back and look for later siblings of our parent if it has the same parent dom node
|
|
var grandParent = parent.parentWidget;
|
|
if(grandParent && parent.parentDomNode === this.parentDomNode) {
|
|
index = grandParent.children.indexOf(parent);
|
|
if(index !== -1) {
|
|
return parent.findNextSiblingDomNode(index);
|
|
}
|
|
}
|
|
return null;
|
|
};
|
|
|
|
/*
|
|
Find the first DOM node generated by a widget or its children
|
|
*/
|
|
Widget.prototype.findFirstDomNode = function() {
|
|
// Return the first dom node of this widget, if we've got one
|
|
if(this.domNodes.length > 0) {
|
|
return this.domNodes[0];
|
|
}
|
|
// Otherwise, recursively call our children
|
|
for(var t=0; t<this.children.length; t++) {
|
|
var domNode = this.children[t].findFirstDomNode();
|
|
if(domNode) {
|
|
return domNode;
|
|
}
|
|
}
|
|
return null;
|
|
};
|
|
|
|
/*
|
|
Remove any DOM nodes created by this widget or its children
|
|
*/
|
|
Widget.prototype.removeChildDomNodes = function() {
|
|
// If this widget has directly created DOM nodes, delete them and exit. This assumes that any child widgets are contained within the created DOM nodes, which would normally be the case
|
|
if(this.domNodes.length > 0) {
|
|
$tw.utils.each(this.domNodes,function(domNode) {
|
|
domNode.parentNode.removeChild(domNode);
|
|
});
|
|
this.domNodes = [];
|
|
} else {
|
|
// Otherwise, ask the child widgets to delete their DOM nodes
|
|
$tw.utils.each(this.children,function(childWidget) {
|
|
childWidget.removeChildDomNodes();
|
|
});
|
|
}
|
|
};
|
|
|
|
/*
|
|
Invoke the action widgets that are descendents of the current widget.
|
|
*/
|
|
Widget.prototype.invokeActions = function(triggeringWidget,event) {
|
|
var handled = false;
|
|
// For each child widget
|
|
for(var t=0; t<this.children.length; t++) {
|
|
var child = this.children[t],
|
|
childIsActionWidget = !!child.invokeAction,
|
|
actionRefreshPolicy = child.getVariable("tv-action-refresh-policy"); // Default is "once"
|
|
// Refresh the child if required
|
|
if(childIsActionWidget || actionRefreshPolicy === "always") {
|
|
child.refreshSelf();
|
|
}
|
|
// Invoke the child if it is an action widget
|
|
if(childIsActionWidget) {
|
|
if(child.invokeAction(triggeringWidget,event)) {
|
|
handled = true;
|
|
}
|
|
}
|
|
// Propagate through through the child if it permits it
|
|
if(child.allowActionPropagation() && child.invokeActions(triggeringWidget,event)) {
|
|
handled = true;
|
|
}
|
|
}
|
|
return handled;
|
|
};
|
|
|
|
/*
|
|
Invoke the action widgets defined in a string
|
|
*/
|
|
Widget.prototype.invokeActionString = function(actions,triggeringWidget,event,variables) {
|
|
actions = actions || "";
|
|
var parser = this.wiki.parseText("text/vnd.tiddlywiki",actions,{
|
|
parentWidget: this,
|
|
document: this.document
|
|
}),
|
|
widgetNode = this.wiki.makeWidget(parser,{
|
|
parentWidget: this,
|
|
document: this.document,
|
|
variables: variables
|
|
});
|
|
var container = this.document.createElement("div");
|
|
widgetNode.render(container,null);
|
|
return widgetNode.invokeActions(this,event);
|
|
};
|
|
|
|
/*
|
|
Execute action tiddlers by tag
|
|
*/
|
|
Widget.prototype.invokeActionsByTag = function(tag,event,variables) {
|
|
var self = this;
|
|
$tw.utils.each(self.wiki.filterTiddlers("[all[shadows+tiddlers]tag[" + tag + "]!has[draft.of]]"),function(title) {
|
|
self.invokeActionString(self.wiki.getTiddlerText(title),self,event,variables);
|
|
});
|
|
};
|
|
|
|
Widget.prototype.allowActionPropagation = function() {
|
|
return true;
|
|
};
|
|
|
|
/*
|
|
Find child <$data> widgets recursively. The tag name allows aliased versions of the widget to be found too
|
|
*/
|
|
Widget.prototype.findChildrenDataWidgets = function(children,tag,callback) {
|
|
var self = this;
|
|
$tw.utils.each(children,function(child) {
|
|
if(child.dataWidgetTag === tag) {
|
|
callback(child);
|
|
}
|
|
if(child.children) {
|
|
self.findChildrenDataWidgets(child.children,tag,callback);
|
|
}
|
|
});
|
|
};
|
|
|
|
/*
|
|
Evaluate a variable with parameters. This is a static convenience method that attempts to evaluate a variable as a function, returning an array of strings
|
|
*/
|
|
Widget.evaluateVariable = function(widget,name,options) {
|
|
var result;
|
|
if(widget.getVariableInfo) {
|
|
var variableInfo = widget.getVariableInfo(name,options);
|
|
result = variableInfo.resultList || [variableInfo.text];
|
|
} else {
|
|
result = [widget.getVariable(name)];
|
|
}
|
|
return result;
|
|
};
|
|
|
|
exports.widget = Widget;
|
|
|
|
})();
|