[Spritelab] Implement Pause button behind experiment

apps/src/p5lab/P5Lab.js

@@ -391,8 +391,10 @@ P5Lab.prototype.init = function(config) {
     (!config.hideSource &&
       !config.level.debuggerDisabled &&
       !config.level.iframeEmbedAppAndCode);
+  var showPauseButton = experiments.isEnabled(experiments.SPRITELAB_PAUSE);
   var showDebugConsole = config.level.editCode && !config.hideSource;
-  this.debuggerEnabled = showDebugButtons || showDebugConsole;
+  this.debuggerEnabled =
+    showDebugButtons || showPauseButton || showDebugConsole;
 
   if (this.debuggerEnabled) {
     getStore().dispatch(
@@ -492,6 +494,7 @@ P5Lab.prototype.init = function(config) {
           <P5LabView
             showFinishButton={finishButtonFirstLine && showFinishButton}
             onMount={onMount}
+            pauseHandler={this.onPause}
           />
         </Provider>,
         document.getElementById(config.containerId)
@@ -647,6 +650,11 @@ P5Lab.prototype.setupReduxSubscribers = function(store) {
   });
 };
 
+/**
+ * Override to change pause behavior.
+ */
+P5Lab.prototype.onPause = function() {};
+
 P5Lab.prototype.onIsRunningChange = function() {
   this.setCrosshairCursorForPlaySpace();
 };

apps/src/p5lab/P5LabView.jsx

@@ -40,7 +40,8 @@ class P5LabView extends React.Component {
     isIframeEmbed: PropTypes.bool.isRequired,
     isRunning: PropTypes.bool.isRequired,
     spriteLab: PropTypes.bool.isRequired,
-    isBackground: PropTypes.bool
+    isBackground: PropTypes.bool,
+    pauseHandler: PropTypes.func.isRequired
   };
 
   state = {
@@ -119,7 +120,10 @@ class P5LabView extends React.Component {
           style={visualizationColumnStyle}
         >
           {this.props.showVisualizationHeader && <P5LabVisualizationHeader />}
-          <P5LabVisualizationColumn finishButton={showFinishButton} />
+          <P5LabVisualizationColumn
+            finishButton={showFinishButton}
+            pauseHandler={this.props.pauseHandler}
+          />
           {this.getChannelId() && (
             <AnimationPicker
               channelId={this.getChannelId()}

apps/src/p5lab/P5LabVisualizationColumn.jsx

@@ -5,6 +5,7 @@ import {connect} from 'react-redux';
 import classNames from 'classnames';
 import GameButtons from '@cdo/apps/templates/GameButtons';
 import ArrowButtons from '@cdo/apps/templates/ArrowButtons';
+import PauseButton from '@cdo/apps/templates/PauseButton';
 import BelowVisualization from '@cdo/apps/templates/BelowVisualization';
 import experiments from '@cdo/apps/util/experiments';
 import {APP_HEIGHT, APP_WIDTH} from './constants';
@@ -56,9 +57,20 @@ class P5LabVisualizationColumn extends React.Component {
     cancelPicker: PropTypes.func.isRequired,
     selectPicker: PropTypes.func.isRequired,
     updatePicker: PropTypes.func.isRequired,
-    consoleMessages: PropTypes.array.isRequired
+    consoleMessages: PropTypes.array.isRequired,
+    pauseHandler: PropTypes.func.isRequired
   };
 
+  constructor(props) {
+    super(props);
+    this.spritelabPauseExperiment = experiments.isEnabled(
+      experiments.SPRITELAB_PAUSE
+    );
+    this.spritelabInputExperiment = experiments.isEnabled(
+      experiments.SPRITELAB_INPUT
+    );
+  }
+
   // Cache app-space mouse coordinates, which we get from the
   // VisualizationOverlay when they change.
   state = {
@@ -186,12 +198,13 @@ class P5LabVisualizationColumn extends React.Component {
             </VisualizationOverlay>
           </ProtectedVisualizationDiv>
           <TextConsole consoleMessages={this.props.consoleMessages} />
-          {experiments.isEnabled(experiments.SPRITELAB_INPUT) && (
-            <SpritelabInput />
-          )}
+          {this.spritelabInputExperiment && <SpritelabInput />}
         </div>
 
         <GameButtons>
+          {this.spritelabPauseExperiment && (
+            <PauseButton pauseHandler={this.props.pauseHandler} />
+          )}
           <ArrowButtons />
 
           <CompletionButton />

apps/src/p5lab/spritelab/SpriteLab.js

@@ -50,3 +50,12 @@ SpriteLab.prototype.reset = function() {
   getStore().dispatch(clearPrompts());
   this.preview();
 };
+
+SpriteLab.prototype.onPause = function(isPaused) {
+  const current = new Date().getTime();
+  if (isPaused) {
+    coreLibrary.endPause(current);
+  } else {
+    coreLibrary.startPause(current);
+  }
+};

apps/src/p5lab/spritelab/commands/worldCommands.js

@@ -10,7 +10,7 @@ export const commands = {
 
   getTime(unit) {
     if (unit === 'seconds') {
-      return this.World.seconds || 0;
+      return coreLibrary.getAdjustedWorldTime(this) || 0;
     } else if (unit === 'frames') {
       return this.World.frameCount || 0;
     }

apps/src/p5lab/spritelab/coreLibrary.js

@@ -4,6 +4,8 @@ var inputEvents = [];
 var behaviors = [];
 var userInputEventCallbacks = {};
 var newSprites = {};
+var totalPauseTime = 0;
+var currentPauseStartTime = 0;
 
 export var background;
 export var title = '';
@@ -19,6 +21,24 @@ export function reset() {
   title = subtitle = '';
   userInputEventCallbacks = {};
   defaultSpriteSize = 100;
+  totalPauseTime = 0;
+}
+
+export function startPause(time) {
+  currentPauseStartTime = time;
+}
+
+export function endPause(time) {
+  totalPauseTime += time - currentPauseStartTime;
+  currentPauseStartTime = 0;
+}
+
+/**
+ * Returns World.seconds adjusted to exclude time during which the app was paused
+ */
+export function getAdjustedWorldTime(p5Inst) {
+  const current = new Date().getTime();
+  return Math.round((current - p5Inst._startTime - totalPauseTime) / 1000);
 }
 
 /**
@@ -205,13 +225,11 @@ export function clearCollectDataEvents() {
 function atTimeEvent(inputEvent, p5Inst) {
   if (inputEvent.args.unit === 'seconds') {
     const previousTime = inputEvent.previousTime || 0;
-    inputEvent.previousTime = p5Inst.World.seconds;
+    const worldTime = getAdjustedWorldTime(p5Inst);
+    inputEvent.previousTime = worldTime;
     // There are many ticks per second, but we only want to fire the event once (on the first tick where
-    // World.seconds matches the event argument)
-    if (
-      p5Inst.World.seconds === inputEvent.args.n &&
-      previousTime !== inputEvent.args.n
-    ) {
+    // the time matches the event argument)
+    if (worldTime === inputEvent.args.n && previousTime !== inputEvent.args.n) {
       // Call callback with no extra args
       return [{}];
     }
@@ -227,10 +245,11 @@ function atTimeEvent(inputEvent, p5Inst) {
 
 function collectDataEvent(inputEvent, p5Inst) {
   const previous = inputEvent.previous || 0;
-  inputEvent.previous = p5Inst.World.seconds;
+  const worldTime = getAdjustedWorldTime(p5Inst);
+  inputEvent.previous = worldTime;
 
   // Only log data once per second
-  if (p5Inst.World.seconds !== previous) {
+  if (worldTime !== previous) {
     // Call callback with no extra args
     return [{}];
   } else {

apps/src/templates/PauseButton.jsx

@@ -0,0 +1,57 @@
+import React from 'react';
+import {connect} from 'react-redux';
+import PropTypes from 'prop-types';
+import color from '@cdo/apps/util/color';
+import {actions, selectors} from '@cdo/apps/lib/tools/jsdebugger/redux';
+
+const styles = {
+  button: {
+    minWidth: 0,
+    padding: '10px 13px',
+    backgroundColor: color.orange,
+    borderColor: color.orange,
+    color: color.white
+  }
+};
+
+class PauseButton extends React.Component {
+  static propTypes = {
+    pauseHandler: PropTypes.func.isRequired,
+    // from redux
+    togglePause: PropTypes.func.isRequired,
+    isPaused: PropTypes.bool.isRequired,
+    isAttached: PropTypes.bool.isRequired
+  };
+
+  state = {
+    pauseStart: 0
+  };
+
+  togglePause = () => {
+    this.props.pauseHandler(this.props.isPaused);
+    this.props.togglePause();
+  };
+
+  render() {
+    return (
+      <button
+        type="button"
+        onClick={this.togglePause}
+        style={styles.button}
+        disabled={!this.props.isAttached}
+      >
+        <i className={this.props.isPaused ? 'fa fa-play' : 'fa fa-pause'} />
+      </button>
+    );
+  }
+}
+
+export default connect(
+  state => ({
+    isAttached: selectors.isAttached(state),
+    isPaused: selectors.isPaused(state)
+  }),
+  {
+    togglePause: actions.togglePause
+  }
+)(PauseButton);

apps/src/util/experiments.js

@@ -33,6 +33,7 @@ experiments.SPRITELAB_INPUT = 'spritelabInput';
 experiments.TIME_SPENT = 'time-spent';
 experiments.APPLAB_ML = 'applab-ml';
 experiments.BYPASS_DIALOG_POPUP = 'bypass-dialog-popup';
+experiments.SPRITELAB_PAUSE = 'spritelabPause';
 
 /**
  * Get our query string. Provided as a method so that tests can mock this.