<snapdata remixID="9183787"><project name="U2L4-brickwall" app="Snap! 5.4, 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" penlog="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="-99" y="30" 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="179" y="89"><block s="receiveGo"></block><block s="gotoXY"><l>-99</l><l>160</l></block><block s="clear"></block><custom-block s="draw wall with %n rows"><l>10</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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