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<!DOCTYPE html>
<html lang="en">
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<meta charset="utf-8">
<title>JSDoc: Source: base/Tickable.js</title>
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<h1 class="page-title">Source: base/Tickable.js</h1>
<section>
<article>
<pre class="prettyprint source linenums"><code>/*
* Copyright 2020 WICKLETS LLC
*
* This file is part of Wick Engine.
*
* Wick Engine is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Wick Engine is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Wick Engine. If not, see <https://www.gnu.org/licenses/>.
*/
/**
* A class that is extended by any wick object that ticks.
*/
Wick.Tickable = class extends Wick.Base {
/**
* Debugging feature. Logs errors as they happen
*/
static get LOG_ERRORS () {
return false;
}
/**
* Returns a list of all possible events for this object.
* @return {string[]} Array of all possible scripts.
*/
static get possibleScripts () {
return [
'default',
'mouseenter',
'mousedown',
'mousepressed',
'mousereleased',
'mouseleave',
'mousehover',
'mousedrag',
'mouseclick',
'keypressed',
'keyreleased',
'keydown',
'load',
'update',
'unload',
];
}
/**
* Create a new tickable object.
*/
constructor (args) {
if(!args) args = {};
super(args);
this._onscreen = false;
this._onscreenLastTick = false;
this._mouseState = 'out';
this._lastMouseState = 'out';
this._isClickTarget = false;
this._scripts = [];
this.cursor = 'default';
this.addScript('default', '');
this._onEventFns = {};
this._cachedScripts = {};
}
_deserialize (data) {
super._deserialize(data);
this._onscreen = false;
this._onscreenLastTick = false;
this._mouseState = 'out';
this._lastMouseState = 'out';
this._scripts = JSON.parse(JSON.stringify(data.scripts));
this.cursor = data.cursor;
this._onEventFns = {};
this._cachedScripts = {};
}
_serialize (args) {
var data = super._serialize(args);
data.scripts = JSON.parse(JSON.stringify(this._scripts));
data.cursor = this.cursor;
return data;
}
get classname () {
return 'Tickable';
}
/**
* The scripts on this object.
* @type {object[]}
*/
get scripts () {
return this._scripts;
}
/**
* Checks if this object has a non-empty script.
* @type {boolean}
*/
get hasContentfulScripts () {
var hasContentfulScripts = false;
this._scripts.forEach(script => {
if(hasContentfulScripts) return;
if(script.src !== '') {
hasContentfulScripts = true;
}
})
return hasContentfulScripts;
}
/**
* Check if this object is currently visible in the project, based on its parent.
* @type {boolean}
*/
get onScreen () {
if(!this.parent) return false;
return this.parent.onScreen;
}
/**
* Add a function to be called when an event happens.
* @param {string} name - The name of the event to attach the function to.
* @param {function} fn - The function to call when the given event happens.
*/
onEvent (name, fn) {
if(Wick.Tickable.possibleScripts.indexOf(name) === -1) {
console.warn("onEvent: " + name + " is not a valid event name.");
return;
}
this.addEventFn(name, fn);
}
/**
* Attach a function to a given event.
* @param {string} name - the name of the event to attach a function to.
* @param {function} fn - the function to attach
*/
addEventFn (name, fn) {
this.getEventFns(name).push(fn);
}
/**
* Gets all functions attached to an event with a given name.
* @param {string} - The name of the event
*/
getEventFns (name) {
if(!this._onEventFns[name]) {
this._onEventFns[name] = [];
}
return this._onEventFns[name];
}
/**
* Check if an object can have scripts attached to it. Helpful when iterating through a lot of different wick objects that may or may not be tickables. Always returns true.
* @type {boolean}
*/
get isScriptable () {
return true;
}
/**
* Add a new script to an object.
* @param {string} name - The name of the event that will trigger the script. See Wick.Tickable.possibleScripts
* @param {string} src - The source code of the new script.
*/
addScript (name, src) {
if(Wick.Tickable.possibleScripts.indexOf(name) === -1) console.error(name + ' is not a valid script!');
if(this.hasScript(name)) {
this.updateScript(name, src);
return;
}
this._scripts.push({
name: name,
src: '',
});
// Sort scripts by where they appear in the possibleScripts list
var possibleScripts = Wick.Tickable.possibleScripts;
this._scripts.sort((a,b) => {
return possibleScripts.indexOf(a.name) - possibleScripts.indexOf(b.name);
});
if(src) {
this.updateScript(name, src);
}
}
/**
* Get the script of this object that is triggered when the given event name happens.
* @param {string} name - The name of the event. See Wick.Tickable.possibleScripts
* @returns {object} the script with the given name. Can be null if the object doesn't have that script.
*/
getScript (name) {
if(Wick.Tickable.possibleScripts.indexOf(name) === -1) console.error(name + ' is not a valid script!');
return this._scripts.find(script => {
return script.name === name;
});
}
/**
* Returns a list of script names which are not currently in use for this object.
* @return {string[]} Available script names.
*/
getAvailableScripts () {
return Wick.Tickable.possibleScripts.filter(script => !this.hasScript(script));
}
/**
* Check if the object has a script with the given event name.
* @param {string} name - The name of the event. See Wick.Tickable.possibleScripts
* @returns {boolean} True if the script with the given name exists
*/
hasScript (name) {
return this.getScript(name) !== undefined;
}
/**
* Check if the object has a non-empty script with a given name.
* @param {string} name - The name of the event. See Wick.Tickable.possibleScripts
* @returns {boolean} True if the script with the given name has code
*/
scriptIsContentful (name) {
if(!this.hasScript(name)) {
return false;
}
var script = this.getScript(name);
return script.src.trim() !== '';
}
/**
* Changes the source of the script with the given event name.
* @param {string} name - The name of the event that will trigger the script. See Wick.Tickable.possibleScripts
* @param {string} src - The source code of the script.
*/
updateScript (name, src) {
this.getScript(name).src = src;
delete this._cachedScripts[name];
}
/**
* Remove the script that corresponds to a given event name.
* @param {string} name - The name of the event. See Wick.Tickable.possibleScripts
*/
removeScript (name) {
this._scripts = this._scripts.filter(script => {
return script.name !== name;
});
}
/**
* Schedule a script to run at the end of the tick.
* @param {string} name - The name of the script to run. See Tickable.possibleScripts
* @param {Object} parameters - An object consisting of key,value pairs which correspond to parameters to pass to the script.
*/
scheduleScript (name, parameters) {
if(!this.project) return;
this.project.scheduleScript(this.uuid, name, parameters);
}
/**
* Run the script with the corresponding event name.
* @param {string} name - The name of the event. See Wick.Tickable.possibleScripts
* @param {Object} parameters - An object containing key,value pairs of parameters to send to the script.
* @returns {object} object containing error info if an error happened. Returns null if there was no error (script ran successfully)
*/
runScript (name, parameters) {
if(!Wick.Tickable.possibleScripts.indexOf(name) === -1) {
console.error(name + ' is not a valid script!');
}
// Don't run scripts if this object is the focus
// (this makes it so preview play will always play, even if the parent Clip of the timeline has a stop script)
if(this.project && this.project.focus === this) {
return null;
}
// Run functions attached using onEvent
var eventFnError = null;
this.getEventFns(name).forEach(eventFn => {
if(eventFnError) return;
eventFnError = this._runFunction(eventFn, name, parameters);
});
if(eventFnError) {
this.project.error = eventFnError;
return;
}
// Run function inside tab
if(this.scriptIsContentful(name)) {
var script = this.getScript(name);
var fn = this._cachedScripts[name] || this._evalScript(name, script.src);
if(!(fn instanceof Function)) {
return fn; // error
}
this._cachedScripts[name] = fn;
var error = this._runFunction(fn, name, parameters);
if(error) {
this.project.error = error;
return;
}
}
}
/**
* The tick routine to be called when the object ticks.
* @returns {object} - An object with information about the result from ticking. Null if no errors occured, and the script ran successfully.
*/
tick () {
// Update named child references
this._attachChildClipReferences();
// Update onScreen flags.
this._onscreenLastTick = this._onscreen;
this._onscreen = this.onScreen;
// Update mouse states.
this._lastMouseState = this._mouseState;
if(this.project && this.project.objectIsMouseTarget(this)) {
if(this.project.isMouseDown) {
this._mouseState = 'down';
} else {
this._mouseState = 'over';
}
} else {
this._mouseState = 'out';
}
// Call tick event function that corresponds to state.
if(!this._onscreen && !this._onscreenLastTick) {
this._onInactive();
} else if (this._onscreen && !this._onscreenLastTick) {
this._onActivated();
} else if (this._onscreen && this._onscreenLastTick) {
this._onActive();
} else if (!this._onscreen && this._onscreenLastTick) {
this._onDeactivated();
}
}
_onInactive () {
// Do nothing.
}
_onActivated () {
this.scheduleScript('default');
this.scheduleScript('load');
}
_onActive () {
this.scheduleScript('update');
var current = this._mouseState;
var last = this._lastMouseState;
// Mouse enter
if(last === 'out' && current !== 'out') {
this.scheduleScript('mouseenter');
}
// Mouse down
if(current === 'down') {
this.scheduleScript('mousedown');
}
// Mouse pressed
if(last === 'over' && current === 'down') {
this._isClickTarget = true;
this.scheduleScript('mousepressed');
}
// Mouse click
if(last === 'down' && current === 'over' && this._isClickTarget) {
this.scheduleScript('mouseclick');
}
// Mouse released
if(last === 'down' && current === 'over') {
this._isClickTarget = false;
this.scheduleScript('mousereleased');
}
// Mouse leave
if(last !== 'out' && current === 'out') {
this.scheduleScript('mouseleave');
}
// Mouse hover
if(current === 'over') {
this.scheduleScript('mousehover');
}
// Mouse drag
if(last === 'down' && current === 'down') {
this.scheduleScript('mousedrag');
}
// Key down
this.project.keysDown.forEach(key => {
this.project.currentKey = key;
this.scheduleScript('keydown', {key: key});
});
// Key press
this.project.keysJustPressed.forEach(key => {
this.project.currentKey = key;
this.scheduleScript('keypressed', {key: key});
});
// Key released
this.project.keysJustReleased.forEach(key => {
this.project.currentKey = key;
this.scheduleScript('keyreleased', {key: key});
});
}
_onDeactivated () {
this._isClickTarget = false;
this.scheduleScript('unload');
}
_evalScript (name, src) {
var fn = null;
// Check for syntax/parsing errors
try {
esprima.parseScript(src);
} catch (e) {
this.project.error = this._generateEsprimaErrorInfo(e, name);
return;
}
// Attempt to create valid function...
try {
fn = new Function([], src);
} catch (e) {
// This should almost never be thrown unless there is an attempt to use syntax
// that the syntax checker (esprima) does not understand.
this.project.error = this._generateErrorInfo(e, name);
return;
}
return fn;
}
/**
* _runFunction runs an event function while passing in necessary global and local parameters.
* @param {string} fn - Function to run.
* @param {string} name - Name of the event function being run (i.e. keyDown)
* @param {Object} parameters - An object of key,value pairs to be passed as parameters to the function.
*/
_runFunction (fn, name, parameters) {
var error = null;
// Attach API methods
var globalAPI = new GlobalAPI(this);
var otherObjects = this.parentClip ? this.parentClip.activeNamedChildren : [];
var apiMembers = globalAPI.apiMembers.concat(otherObjects.map(otherObject => {
return {
name: otherObject.identifier,
fn: otherObject,
}
}));
// Add in parameters, if necessary.
if (parameters) {
Object.keys(parameters).forEach(parameter => {
apiMembers.push({
name: parameter,
fn: parameters[parameter],
})
});
}
apiMembers.forEach(apiMember => {
window[apiMember.name] = apiMember.fn;
});
// These are currently hacked in here for performance reasons...
var project = this.project;
var root = project && project.root;
window.project = root;
if(project) {
window.project.resolution = {x: project.width, y: project.height};
window.project.framerate = project.framerate;
window.project.backgroundColor = project.backgroundColor;
}
window.root = root;
window.parent = this.parentClip;
window.parentObject = this.parentObject;
// Run the function
var thisScope = this instanceof Wick.Frame ? this.parentClip : this;
try {
fn.bind(thisScope)();
} catch (e) {
// Catch runtime errors
error = this._generateErrorInfo(e, name);
}
// These are currently hacked in here for performance reasons...
delete window.project;
delete window.root;
delete window.parent;
delete window.parentObject;
// Detatch API methods
apiMembers.forEach(apiMember => {
delete window[apiMember.name];
});
return error;
}
_generateErrorInfo (error, name) {
if(Wick.Tickable.LOG_ERRORS) console.log(error);
return {
name: name !== undefined ? name : '',
lineNumber: this._generateLineNumberFromStackTrace(error.stack),
message: error.message,
uuid: this.isClone ? this.sourceClipUUID : this.uuid,
}
}
_generateEsprimaErrorInfo (error, name) {
if(Wick.Tickable.LOG_ERRORS) console.log(error);
return {
name: name !== undefined ? name : '',
lineNumber: error.lineNumber,
message: error.description,
uuid: this.uuid,
}
}
_generateLineNumberFromStackTrace (trace) {
var lineNumber = null;
trace.split('\n').forEach(line => {
if(lineNumber !== null) return;
var split = line.split(':');
var lineString = split[split.length-2];
var lineInt = parseInt(lineString);
if(!isNaN(lineInt)) {
lineNumber = lineInt - 2;
lineNumber = lineInt;
lineNumber = lineNumber - 2;
}
});
return lineNumber;
}
_attachChildClipReferences () {
// Implemented by Wick.Clip and Wick.Frame.
}
}
</code></pre>
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