<snapdata remixID="8928385"><project name="U2L4-checkerboard_SV" app="Snap! 5.1, http://snap.berkeley.edu" version="1"><notes></notes><thumbnail>data:image/png;base64,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</thumbnail><stage name="Stage" width="480" height="360" costume="0" color="255,255,255,1" tempo="60" threadsafe="false" volume="100" pan="0" lines="flat" ternary="true" codify="false" inheritance="false" sublistIDs="false" scheduled="false" id="1"><pentrails>data:image/png;base64,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</pentrails><costumes><list struct="atomic" id="2"></list></costumes><sounds><list struct="atomic" id="3"></list></sounds><variables></variables><blocks></blocks><scripts></scripts><sprites><sprite name="Sprite(2)" idx="1" x="145" y="130" heading="90" scale="1" volume="100" pan="0" rotation="1" draggable="true" costume="0" color="8,5,0,1" pen="tip" id="8"><costumes><list struct="atomic" id="9"></list></costumes><sounds><list struct="atomic" id="10"></list></sounds><blocks></blocks><variables></variables><scripts><script x="10" y="10"><block s="clear"></block><custom-block s="draw checkerboard %n"><l>8</l></custom-block></script></scripts></sprite></sprites></stage><hidden></hidden><headers></headers><code></code><blocks><block-definition s="set flag %&apos;which&apos; to %&apos;tf&apos;" type="command" category="sensing"><header></header><code></code><translations></translations><inputs><input type="%s" readonly="true"><options>Presentation mode&#xD;Retina display support&#xD;Long form input dialog&#xD;Plain prototype labels&#xD;Input sliders&#xD;Execute on slider change&#xD;Clicking sound&#xD;Turbo mode&#xD;Flat design&#xD;Keyboard editing&#xD;Table support&#xD;Table lines&#xD;Visible stepping&#xD;Thread safe scripts&#xD;Prefer smooth animations&#xD;Flat line ends&#xD;Codification support&#xD;Inheritance support</options></input><input type="%b"></input></inputs><script><block s="doRun"><block s="reportJSFunction"><list><l>which</l><l>tf</l></list><l>var   stage = this.parentThatIsA(StageMorph),&#xD;        ide = stage.parentThatIsA(IDE_Morph),&#xD;        world = stage.parentThatIsA(WorldMorph);&#xD;&#xD;if (tf != !!tf) return;&#xD;&#xD;try{&#xD;ide.savingPreferences = false;&#xD;&#xD;switch (which) {&#xD;    case &apos;Presentation mode&apos;:&#xD;        if (tf != ide.isAppMode) ide.toggleAppMode();&#xD;        break;&#xD;    case &apos;Retina display support&apos;:&#xD;        if (tf != isRetinaEnabled()) ide.toggleRetina();&#xD;        break;&#xD;    case &apos;Long form input dialog&apos;:&#xD;        if (tf != InputSlotDialogMorph.prototype.isLaunchingExpanded)&#xD;            ide.toggleLongFormInputDialog();&#xD;        break;&#xD;    case &apos;Plain prototype labels&apos;:&#xD;        if (tf != BlockLabelPlaceHolderMorph.prototype.plainLabel)&#xD;            ide.togglePlainPrototypeLabels();&#xD;        break;&#xD;    case &apos;Input sliders&apos;:&#xD;        MorphicPreferences.useSliderForInput = tf;&#xD;        break;&#xD;    case &apos;Execute on slider change&apos;:&#xD;        ArgMorph.prototype.executeOnSliderEdit = tf;&#xD;        break;&#xD;    case &apos;Clicking sound&apos;:&#xD;        if (tf != !!BlockMorph.prototype.snapSound)&#xD;            BlockMorph.prototype.toggleSnapSound();&#xD;        break;&#xD;    case &apos;Turbo mode&apos;:&#xD;        if (tf != stage.isFastTracked)&#xD;            ide.toggleFastTracking();&#xD;        break;&#xD;    case &apos;Flat design&apos;:&#xD;        if (tf == MorphicPreferences.isFlat) break;&#xD;        if (tf)&#xD;            ide.flatDesign();&#xD;        else&#xD;            ide.defaultDesign();&#xD;        break;&#xD;    case &apos;Keyboard editing&apos;:&#xD;            ScriptsMorph.prototype.enableKeyboard = tf;&#xD;        break;&#xD;    case &apos;Table support&apos;:&#xD;            List.prototype.enableTables = tf;&#xD;        break;&#xD;    case &apos;Table lines&apos;:&#xD;                TableMorph.prototype.highContrast = tf;&#xD;        break;&#xD;    case &apos;Visible stepping&apos;:&#xD;        if (tf != Process.prototype.enableSingleStepping)&#xD;            ide.toggleSingleStepping();&#xD;        break;&#xD;    case &apos;Thread safe scripts&apos;:&#xD;        stage.isThreadSafe = tf;&#xD;        break;&#xD;    case &apos;Prefer smooth animations&apos;:&#xD;        if (tf != (StageMorph.prototype.frameRate &gt; 0))&#xD;            ide.toggleVariableFrameRate();&#xD;        break;&#xD;    case &apos;Flat line ends&apos;:&#xD;        SpriteMorph.prototype.useFlatLineEnds = tf;&#xD;        break;&#xD;    case &apos;Codification support&apos;:&#xD;        if (tf != StageMorph.prototype.enableCodeMapping) {&#xD;            StageMorph.prototype.enableCodeMapping = tf;&#xD;            ide.currentSprite.blocksCache.variables = null;&#xD;            ide.currentSprite.paletteCache.variables = null;&#xD;            ide.refreshPalette();&#xD;        }&#xD;        break;&#xD;    case &apos;Inheritance support&apos;:&#xD;        if (tf != StageMorph.prototype.enableInheritance) {&#xD;            StageMorph.prototype.enableInheritance = tf;&#xD;            ide.currentSprite.blocksCache.variables = null;&#xD;            ide.currentSprite.paletteCache.variables = null;&#xD;            ide.refreshPalette();&#xD;        }&#xD;        break;&#xD;};&#xD;}&#xD;finally {&#xD;ide.savingPreferences = false;&#xD;};&#xD;</l></block><list><block var="which"/><block var="tf"/></list></block></script></block-definition><block-definition 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