[DevTools] Replace ViewportControl with ListControl.

third_party/WebKit/Source/devtools/front_end/ui/ViewportControl.js

Index: third_party/WebKit/Source/devtools/front_end/ui/ViewportControl.js
diff --git a/third_party/WebKit/Source/devtools/front_end/ui/ViewportControl.js b/third_party/WebKit/Source/devtools/front_end/ui/ViewportControl.js
deleted file mode 100644
index dbd36008c8a08dd7baf1be0f7679ec221d521a0e..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/devtools/front_end/ui/ViewportControl.js
+++ /dev/null
@@ -1,169 +0,0 @@
-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-/**
- * @unrestricted
- */
-UI.ViewportControl = class {
-  /**
-   * @param {!UI.ViewportControl.Provider} provider
-   */
-  constructor(provider) {
-    this.element = createElement('div');
-    this.element.style.overflow = 'auto';
-    this._innerElement = this.element.createChild('div');
-    this._innerElement.style.height = '0px';
-    this._innerElement.style.position = 'relative';
-    this._innerElement.style.overflow = 'hidden';
-
-    this._provider = provider;
-    this.element.addEventListener('scroll', this._update.bind(this), false);
-    this._itemCount = 0;
-    this._indexSymbol = Symbol('UI.ViewportControl._indexSymbol');
-  }
-
-  refresh() {
-    this._itemCount = this._provider.itemCount();
-    this._innerElement.removeChildren();
-
-    var height = 0;
-    this._cumulativeHeights = new Int32Array(this._itemCount);
-    for (var i = 0; i < this._itemCount; ++i) {
-      height += this._provider.fastItemHeight(i);
-      this._cumulativeHeights[i] = height;
-    }
-    this._innerElement.style.height = height + 'px';
-
-    this._update();
-  }
-
-  _update() {
-    if (!this._cumulativeHeights) {
-      this.refresh();
-      return;
-    }
-
-    var visibleHeight = this._visibleHeight();
-    var visibleFrom = this.element.scrollTop;
-    var activeHeight = visibleHeight * 2;
-    var firstActiveIndex = Math.max(
-        Array.prototype.lowerBound.call(this._cumulativeHeights, visibleFrom + 1 - (activeHeight - visibleHeight) / 2),
-        0);
-    var lastActiveIndex = Math.min(
-        Array.prototype.lowerBound.call(
-            this._cumulativeHeights, visibleFrom + visibleHeight + (activeHeight - visibleHeight) / 2),
-        this._itemCount - 1);
-
-    var children = this._innerElement.children;
-    for (var i = children.length - 1; i >= 0; --i) {
-      var element = children[i];
-      if (element[this._indexSymbol] < firstActiveIndex || element[this._indexSymbol] > lastActiveIndex)
-        element.remove();
-    }
-
-    for (var i = firstActiveIndex; i <= lastActiveIndex; ++i)
-      this._insertElement(i);
-  }
-
-  /**
-   * @param {number} index
-   */
-  _insertElement(index) {
-    var element = this._provider.itemElement(index);
-    if (!element || element.parentElement === this._innerElement)
-      return;
-
-    element.style.position = 'absolute';
-    element.style.top = (this._cumulativeHeights[index - 1] || 0) + 'px';
-    element.style.left = '0';
-    element.style.right = '0';
-    element[this._indexSymbol] = index;
-    this._innerElement.appendChild(element);
-  }
-
-  /**
-   * @return {number}
-   */
-  firstVisibleIndex() {
-    return Math.max(Array.prototype.lowerBound.call(this._cumulativeHeights, this.element.scrollTop + 1), 0);
-  }
-
-  /**
-   * @return {number}
-   */
-  lastVisibleIndex() {
-    return Math.min(
-        Array.prototype.lowerBound.call(this._cumulativeHeights, this.element.scrollTop + this._visibleHeight()),
-        this._itemCount);
-  }
-
-  /**
-   * @param {number} index
-   * @param {boolean=} makeLast
-   */
-  scrollItemIntoView(index, makeLast) {
-    var firstVisibleIndex = this.firstVisibleIndex();
-    var lastVisibleIndex = this.lastVisibleIndex();
-    if (index > firstVisibleIndex && index < lastVisibleIndex)
-      return;
-    if (makeLast)
-      this.forceScrollItemToBeLast(index);
-    else if (index <= firstVisibleIndex)
-      this.forceScrollItemToBeFirst(index);
-    else if (index >= lastVisibleIndex)
-      this.forceScrollItemToBeLast(index);
-  }
-
-  /**
-   * @param {number} index
-   */
-  forceScrollItemToBeFirst(index) {
-    this.element.scrollTop = index > 0 ? this._cumulativeHeights[index - 1] : 0;
-    this._update();
-  }
-
-  /**
-   * @param {number} index
-   */
-  forceScrollItemToBeLast(index) {
-    this.element.scrollTop = this._cumulativeHeights[index] - this._visibleHeight();
-    this._update();
-  }
-
-  /**
-   * @return {number}
-   */
-  _visibleHeight() {
-    return this.element.offsetHeight;
-  }
-};
-
-/**
- * @interface
- */
-UI.ViewportControl.Provider = function() {};
-
-UI.ViewportControl.Provider.prototype = {
-  /**
-   * @param {number} index
-   * @return {number}
-   */
-  fastItemHeight(index) {
-    return 0;
-  },
-
-  /**
-   * @return {number}
-   */
-  itemCount() {
-    return 0;
-  },
-
-  /**
-   * @param {number} index
-   * @return {?Element}
-   */
-  itemElement(index) {
-    return null;
-  }
-};