<snapdata remixID="8867412"><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="215.99999999999926" y="-135" heading="270" 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="319" y="37"><block s="gotoXY"><l>0</l><l>0</l></block><block s="clear"></block></script><script x="281" y="163"><custom-block s="rowB"></custom-block></script><script x="303" y="272"><custom-block s="draw wall with %n rows"><l>9</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;        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