<snapdata remixID="8862128"><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="210" y="-90" 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="20" y="20"><block s="clear"></block><block s="gotoXY"><l>0</l><l>0</l></block><custom-block s="draw Brick Wall with %s rows"><l>7</l></custom-block></script><script x="20" y="98"><custom-block s="draw brick, length: %n width: %n"><l></l><l></l></custom-block></script><script x="20" y="137"><custom-block s="rowA"></custom-block></script><script x="20" y="173"><custom-block s="rowB"></custom-block></script><comment x="261" y="22" w="90" collapsed="false">&lt;-- This script shown on the left is the final script used for Page 3. Right-click (or control-click) and select &quot;edit&quot; to view block. To view other abstraction blocks, go to palette, or view rowA &amp; rowB. </comment></scripts></sprite><watcher scope="Sprite" s="xPosition" style="normal" x="10" y="10" color="74,108,212"/><watcher scope="Sprite" s="yPosition" style="normal" x="10" y="31.000001999999995" color="74,108,212"/></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; 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