mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-11-06 10:06:19 +00:00
725 lines
22 KiB
JavaScript
Executable File
725 lines
22 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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/*
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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.variablesConstructor = function() {};
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this.variablesConstructor.prototype = this.parentWidget ? this.parentWidget.variables : {};
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this.variables = new this.variablesConstructor();
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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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isFunctionDefinition: true if the variable is set via a \function pragma (and hence should not have variable substitution performed)
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variableParams: array of {name:, default:} for each function parameter
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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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variableParams: options.variableParams
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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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Returns an object with the following fields:
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params: array of {name:,value:} of parameters passed to wikitext variables
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text: text of variable, with parameters properly substituted
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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 actualParams = options.params || [],
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parentWidget = this.parentWidget;
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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(parentWidget && name in parentWidget.variables) {
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var variable = parentWidget.variables[name],
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originalValue = variable.value,
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value = originalValue,
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params = this.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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// Only substitute variable references if this variable was defined with the \define pragma
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if(variable.isMacroDefinition) {
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value = this.substituteVariableReferences(value,options);
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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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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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return {
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text: this.evaluateMacroModule(name,actualParams,options.defaultValue)
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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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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(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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// 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 = $tw.utils.hashString(output.join(""));
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this.qualifiers[name] = value;
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return value;
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}
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};
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/*
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Compute the current values of the attributes of the widget. Returns a hashmap of the names of the attributes that have changed
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*/
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Widget.prototype.computeAttributes = function() {
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var changedAttributes = {},
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self = this;
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$tw.utils.each(this.parseTreeNode.attributes,function(attribute,name) {
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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 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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value = this.getVariable(attribute.value.name,{params: attribute.value.params});
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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 computed attributes of the widget to a domNode
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options include:
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excludeEventAttributes: ignores attributes whose name begins 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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var assignAttribute = function(name,value) {
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// Check for excluded attribute names
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if(options.excludeEventAttributes && name.substr(0,2) === "on") {
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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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// Handle styles
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if(name.substr(0,6) === "style." && name.length > 6) {
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domNode.style[$tw.utils.unHyphenateCss(name.substr(6))] = value;
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} else {
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// Setting certain attributes can cause a DOM error (eg xmlns on the svg element)
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try {
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domNode.setAttributeNS(namespace,name,value);
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} catch(e) {
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}
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}
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}
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}
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// Not all parse tree nodes have the orderedAttributes property
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if(this.parseTreeNode.orderedAttributes) {
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$tw.utils.each(this.parseTreeNode.orderedAttributes,function(attribute,index) {
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assignAttribute(attribute.name,self.attributes[attribute.name]);
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});
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} else {
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$tw.utils.each(Object.keys(self.attributes).sort(),function(name) {
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assignAttribute(name,self.attributes[name]);
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});
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}
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};
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/*
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Make child widgets correspondng to specified parseTreeNodes
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*/
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Widget.prototype.makeChildWidgets = function(parseTreeNodes,options) {
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options = options || {};
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this.children = [];
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var self = this;
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// Create set variable widgets for each variable
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$tw.utils.each(options.variables,function(value,name) {
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var setVariableWidget = {
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type: "set",
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attributes: {
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name: {type: "string", value: name},
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value: {type: "string", value: value}
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},
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children: parseTreeNodes
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};
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parseTreeNodes = [setVariableWidget];
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});
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$tw.utils.each(parseTreeNodes || (this.parseTreeNode && this.parseTreeNode.children),function(childNode) {
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self.children.push(self.makeChildWidget(childNode));
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});
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};
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/*
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Construct the widget object for a parse tree node
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options include:
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variables: optional hashmap of variables to wrap around the widget
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*/
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Widget.prototype.makeChildWidget = function(parseTreeNode,options) {
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var self = this;
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options = options || {};
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// Check whether this node type is defined by a custom macro definition
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var variableDefinitionName = "<$" + parseTreeNode.type + ">";
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if(parseTreeNode.type !== "transclude" && this.variables[variableDefinitionName] && this.variables[variableDefinitionName].value) {
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var newParseTreeNode = {
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type: "transclude",
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tag: "$transclude",
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attributes: {
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"$variable": {name: "$variable", type: "string", value: variableDefinitionName}
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},
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children: [
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{
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type: "value",
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tag: "$value",
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attributes: {
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"$name": {name: "$name", type: "string", value: "ts-body"}
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},
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children: parseTreeNode.children
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},
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{
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type: "value",
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tag: "$value",
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attributes: {
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"$name": {name: "$name", type: "string", value: "ts-wrapper"}
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},
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children: [
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{
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type: "setvariable",
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tag: "$setvariable",
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attributes: {
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"name": {name: "name", type: "string", value: variableDefinitionName},
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"value": {name: "value", type: "string", value: ""}
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},
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children: [
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{
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type: "slot",
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tag: "$slot",
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attributes: {
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"$name": {name: "$name", type: "string", value: "ts-wrapped"}
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}
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}
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]
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}
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]
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}
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]
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};
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$tw.utils.each(parseTreeNode.attributes,function(attr) {
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// If the attribute starts with a dollar then add an extra dollar so that it doesn't clash with the $xxx attributes of transclude
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var name = attr.name.charAt(0) === "$" ? "$" + attr.name : attr.name,
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newAttr = {
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name: name,
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type: attr.type,
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value: attr.value
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};
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newParseTreeNode.attributes[name] = newAttr;
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});
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parseTreeNode = newParseTreeNode;
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}
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// Get the widget class for this node type
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var WidgetClass = this.widgetClasses[parseTreeNode.type];
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if(!WidgetClass) {
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WidgetClass = this.widgetClasses.text;
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parseTreeNode = {type: "text", text: "Undefined widget '" + parseTreeNode.type + "'"};
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}
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// Create set variable widgets for each variable
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$tw.utils.each(options.variables,function(value,name) {
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var setVariableWidget = {
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type: "set",
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attributes: {
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name: {type: "string", value: name},
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value: {type: "string", value: value}
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},
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children: [
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parseTreeNode
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]
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};
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parseTreeNode = setVariableWidget;
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});
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return new WidgetClass(parseTreeNode,{
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wiki: this.wiki,
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parentWidget: this,
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document: this.document
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});
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};
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/*
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Get the next sibling of this widget
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*/
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Widget.prototype.nextSibling = function() {
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if(this.parentWidget) {
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var index = this.parentWidget.children.indexOf(this);
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if(index !== -1 && index < this.parentWidget.children.length-1) {
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return this.parentWidget.children[index+1];
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}
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}
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return null;
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};
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/*
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Get the previous sibling of this widget
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*/
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Widget.prototype.previousSibling = function() {
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if(this.parentWidget) {
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var index = this.parentWidget.children.indexOf(this);
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if(index !== -1 && index > 0) {
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return this.parentWidget.children[index-1];
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}
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}
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return null;
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};
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/*
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Render the children of this widget into the DOM
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*/
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Widget.prototype.renderChildren = function(parent,nextSibling) {
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var children = this.children;
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for(var i = 0; i < children.length; i++) {
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children[i].render(parent,nextSibling);
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};
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};
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|
|
/*
|
|
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);
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|
};
|
|
} else { // The handler is a function
|
|
this.eventListeners[type] = function(event) {
|
|
return handler.call(self,event);
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|
};
|
|
}
|
|
};
|
|
|
|
/*
|
|
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;
|
|
};
|
|
|
|
exports.widget = Widget;
|
|
|
|
})();
|