made the flow control buttons disabled until the user starts running the algorithm

css/stylesheet.css

@@ -516,3 +516,8 @@ input[type=number]::-webkit-outer-spin-button {
 #btn_pause.active > .btn-text:before {
     content: 'Resume'
 }
+
+button[disabled] {
+  cursor: not-allowed;
+  opacity: 0.6;
+}

js/dom/setup/setup_top_menu.js

@@ -24,52 +24,72 @@ module.exports = () => {
 
   // control
 
-  $('#btn_run').click(function() {
-    $('#btn_trace').click();
-    $('#btn_pause').removeClass('active');
-    $(this).addClass('active');
+  const $btnRun   = $('#btn_run');
+  const $btnTrace = $('#btn_trace');
+  const $btnPause = $('#btn_pause');
+  const $btnPrev  = $('#btn_prev');
+  const $btnNext  = $('#btn_next');
+  const $btnDesc  = $('#btn_desc');
+
+  const flowControlBtns = [ $btnPause, $btnPrev, $btnNext ];
+
+  const setFlowControlState = (isDisabled) => {
+    flowControlBtns.forEach($btn => $btn.attr('disabled', isDisabled));
+  };
+
+  // initially, control buttons are disabled
+  setFlowControlState(true);
+
+  $btnRun.click(() => {
+    $btnTrace.click();
+    $btnPause.removeClass('active');
+    $btnRun.addClass('active');
+    setFlowControlState(false);
     var err = app.getEditor().execute();
     if (err) {
       console.error(err);
       Toast.showErrorToast(err);
     }
   });
-  $('#btn_pause').click(function() {
-    $('#btn_run').toggleClass('active');
-    $(this).toggleClass('active');
+
+  $btnPause.click(() => {
+    $btnRun.toggleClass('active');
+    $btnPause.toggleClass('active');
     if (app.getTracerManager().isPause()) {
       app.getTracerManager().resumeStep();
     } else {
       app.getTracerManager().pauseStep();
     }
   });
-  $('#btn_prev').click(() => {
-    $('#btn_run').removeClass('active');
-    $('#btn_pause').addClass('active');
+
+  $btnPrev.click(() => {
+    $btnRun.removeClass('active');
+    $btnPause.addClass('active');
     app.getTracerManager().pauseStep();
     app.getTracerManager().prevStep();
   });
-  $('#btn_next').click(() => {
-    $('#btn_run').removeClass('active');
-    $('#btn_pause').addClass('active');
+
+  $btnNext.click(() => {
+    $btnRun.removeClass('active');
+    $btnPause.addClass('active');
     app.getTracerManager().pauseStep();
     app.getTracerManager().nextStep();
   });
 
   // description & trace
 
-  $('#btn_desc').click(function() {
+  $btnDesc.click(() => {
     $('.tab_container > .tab').removeClass('active');
     $('#tab_desc').addClass('active');
     $('.tab_bar > button').removeClass('active');
-    $(this).addClass('active');
+    $btnDesc.addClass('active');
   });
 
-  $('#btn_trace').click(function() {
+  $btnTrace.click(() => {
     $('.tab_container > .tab').removeClass('active');
     $('#tab_module').addClass('active');
     $('.tab_bar > button').removeClass('active');
-    $(this).addClass('active');
+    $btnTrace.addClass('active');
   });
 
 };

public/algorithm_visualizer.css

@@ -645,3 +645,8 @@ input[type=number]::-webkit-outer-spin-button {
 #btn_pause.active > .btn-text:before {
     content: 'Resume'
 }
+
+button[disabled] {
+  cursor: not-allowed;
+  opacity: 0.6;
+}

public/algorithm_visualizer.min.css

@@ -13,4 +13,4 @@
  * "Fork me on GitHub" CSS ribbon v0.2.0 | MIT License
  * https://github.com/simonwhitaker/github-fork-ribbon-css
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\ No newline at end of file
+#explanation,.btn,button{white-space:nowrap;text-overflow:ellipsis}.tab>.wrapper,nav,pre,section{box-sizing:border-box}.btn,button,pre{margin:0;outline:0}body,html{margin:0;padding:0;overflow:hidden}body{background:#3f3f3f;font-family:Roboto,sans-serif;color:#bbb;-webkit-font-smoothing:subpixel-antialiased}::-webkit-scrollbar{display:none}a{text-decoration:none}*{color:inherit}:not(input){-webkit-touch-callout:none;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;-o-user-select:none;user-select:none}.btn{display:inline-table}.btn>.wrapper{display:table-cell;vertical-align:middle}.btn,button{vertical-align:top;border:none;height:100%;padding:0 12px;background:0 0;font-size:12px;overflow:hidden}.btn:hover,button:not([disabled]):hover{background:rgba(0,0,0,.15)!important;cursor:pointer}.btn.active,button.active{background:#262626}.btn input,button 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\ No newline at end of file