DevTools: Refactor network panel overview

Source/devtools/front_end/network/NetworkTimeCalculator.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2008, 2009 Anthony Ricaud <rik@webkit.org>
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 291 matching lines @@
         else if (request.cached())
             tooltip = WebInspector.NetworkTimeCalculator._fromCacheFormat.format(tooltip);
         return {left: leftLabel, right: rightLabel, tooltip: tooltip};
     },
 
     /**
      * @param {!WebInspector.NetworkRequest} request
      */
     updateBoundaries: function(request)
     {
-        var lowerBound;
-        if (this.startAtZero)
-            lowerBound = 0;
-        else
-            lowerBound = this._lowerBound(request);
-
-        if (lowerBound !== -1 && (typeof this._minimumBoundary === "undefined" || lowerBound < this._minimumBoundary)) {
-            this._minimumBoundary = lowerBound;
+        var lowerBound = this._lowerBound(request);
+        var upperBound = this._upperBound(request);
+        var changed = false;
+        if (lowerBound !== -1 || this.startAtZero)
+            changed = this._extendBoundariesToIncludeTimestamp(this.startAtZero ? 0 : lowerBound);
+        if (upperBound !== -1)
+            changed = this._extendBoundariesToIncludeTimestamp(upperBound) || changed;
+        if (changed)
             this._boundaryChanged();
-        }
-
-        var upperBound = this._upperBound(request);
-        if (upperBound !== -1 && (typeof this._maximumBoundary === "undefined" || upperBound > this._maximumBoundary)) {
-            this._maximumBoundary = upperBound;
-            this._boundaryChanged();
-        }
     },
 
     /**
+     * @param {number} timestamp
+     * @return {boolean}
+     */
+    _extendBoundariesToIncludeTimestamp: function(timestamp)
+    {
+        var previousMinimumBoundary = this._minimumBoundary;
+        var previousMaximumBoundary = this._maximumBoundary;
+        if (typeof this._minimumBoundary === "undefined" || typeof this._maximumBoundary === "undefined") {
+            this._minimumBoundary = timestamp;
+            this._maximumBoundary = timestamp + 1;
+        } else {
+            this._minimumBoundary = Math.min(timestamp, this._minimumBoundary);
+            this._maximumBoundary = Math.max(timestamp, this._minimumBoundary + 1, this._maximumBoundary);
+        }
+        return previousMinimumBoundary !== this._minimumBoundary || previousMaximumBoundary !== this._maximumBoundary;
+    },
+
+    /**
      * @param {!WebInspector.NetworkRequest} request
      * @return {number}
      */
     _lowerBound: function(request)
     {
         return 0;
     },
 
     /**
      * @param {!WebInspector.NetworkRequest} request
@@ skipping 77 matching lines @@
      * @param {!WebInspector.NetworkRequest} request
      * @return {number}
      */
     _upperBound: function(request)
     {
         return request.duration;
     },
 
     __proto__: WebInspector.NetworkTimeCalculator.prototype
 }