<snapdata remixID="8947626"><project name="U2L4-brickwall" 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" idx="1" x="-150" y="-60" heading="90" scale="1" volume="100" pan="0" rotation="1" draggable="true" costume="0" color="145,26,68,1" 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="349" y="56"><block s="receiveGo"></block><block s="clear"></block><block s="gotoXY"><l>-150</l><l>-140</l></block><custom-block s="draw brick wall with %n rows"><l>4</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 = 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