[DevTools] Replace ViewportControl with ListControl.

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

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 28 matching lines @@
    */
   applySuggestion(suggestion, isIntermediateSuggestion) {},
 
   /**
    * acceptSuggestion will be always called after call to applySuggestion with isIntermediateSuggestion being equal to false.
    */
   acceptSuggestion() {},
 };
 
 /**
- * @implements {UI.ViewportControl.Provider}
  * @unrestricted
  */
 UI.SuggestBox = class {
   /**
    * @param {!UI.SuggestBoxDelegate} suggestBoxDelegate
    * @param {number=} maxItemsHeight
    * @param {boolean=} captureEnter
    */
   constructor(suggestBoxDelegate, maxItemsHeight, captureEnter) {
     this._suggestBoxDelegate = suggestBoxDelegate;
-    this._length = 0;
     this._selectedIndex = -1;
     this._selectedElement = null;
     this._maxItemsHeight = maxItemsHeight;
     this._maybeHideBound = this._maybeHide.bind(this);
     this._container = createElementWithClass('div', 'suggest-box-container');
-    this._viewport = new UI.ViewportControl(this);
+    /** @type {!UI.ViewportControl<!UI.SuggestBox.Suggestion>} */
+    this._viewport = new UI.ViewportControl();
+    this._viewport.setRenderer(this._createItemElement.bind(this));
     this._element = this._viewport.element;
     this._element.classList.add('suggest-box');
     this._container.appendChild(this._element);
     this._element.addEventListener('mousedown', this._onBoxMouseDown.bind(this), true);
     this._detailsPopup = this._container.createChild('div', 'suggest-box details-popup monospace');
     this._detailsPopup.classList.add('hidden');
     this._asyncDetailsCallback = null;
     /** @type {!Map<number, !Promise<{detail: string, description: string}>>} */
     this._asyncDetailsPromises = new Map();
     this._userInteracted = false;
     this._captureEnter = captureEnter;
-    /** @type {!Array<!Element>} */
-    this._elementList = [];
-    this._rowHeight = 17;
     this._viewportWidth = '100vw';
     this._hasVerticalScroll = false;
     this._userEnteredText = '';
-    /** @type {!UI.SuggestBox.Suggestions} */
-    this._items = [];
   }
 
   /**
    * @return {boolean}
    */
   visible() {
     return !!this._container.parentElement;
   }
 
   /**
    * @param {!AnchorBox} anchorBox
    */
   setPosition(anchorBox) {
     this._updateBoxPosition(anchorBox);
   }
 
   /**
    * @param {!AnchorBox} anchorBox
    */
   _updateBoxPosition(anchorBox) {
     console.assert(this._overlay);
-    if (this._lastAnchorBox && this._lastAnchorBox.equals(anchorBox) && this._lastItemCount === this.itemCount())
+    if (this._lastAnchorBox && this._lastAnchorBox.equals(anchorBox) && this._lastItemCount === this._viewport.length())
       return;
-    this._lastItemCount = this.itemCount();
+    this._lastItemCount = this._viewport.length();
     this._lastAnchorBox = anchorBox;
 
     // Position relative to main DevTools element.
     var container = UI.Dialog.modalHostView().element;
     anchorBox = anchorBox.relativeToElement(container);
     var totalHeight = container.offsetHeight;
     var aboveHeight = anchorBox.y;
     var underHeight = totalHeight - anchorBox.y - anchorBox.height;
 
     this._overlay.setLeftOffset(anchorBox.x);
 
     var under = underHeight >= aboveHeight;
     if (under)
       this._overlay.setVerticalOffset(anchorBox.y + anchorBox.height, true);
     else
       this._overlay.setVerticalOffset(totalHeight - anchorBox.y, false);
 
     var spacer = 6;
+    var rowHeight = this._viewport.measuredElementHeight();
     var maxHeight = Math.min(
         Math.max(underHeight, aboveHeight) - spacer,
-        this._maxItemsHeight ? this._maxItemsHeight * this._rowHeight : Infinity);
-    var height = this._rowHeight * this._items.length;
+        this._maxItemsHeight ? this._maxItemsHeight * rowHeight : Infinity);
+    var height = rowHeight * this._viewport.length();
     this._hasVerticalScroll = height > maxHeight;
     this._element.style.height = Math.min(maxHeight, height) + 'px';
   }
 
   _updateWidth() {
     if (this._hasVerticalScroll) {
       this._element.style.width = '100vw';
       return;
     }
+    if (!this._viewport.length())
+      return;
     // If there are no scrollbars, set the width to the width of the largest row.
+    var maxItem = this._viewport.itemAtIndex(0);
     var maxIndex = 0;
-    for (var i = 0; i < this._items.length; i++) {
-      if (this._items[i].title.length > this._items[maxIndex].title.length)
+    for (var i = 1; i < this._viewport.length(); i++) {
+      var item = this._viewport.itemAtIndex(i);
+      if (item.title.length > maxItem.title.length) {
+        maxItem = item;
         maxIndex = i;
+      }
     }
-    var element = /** @type {!Element} */ (this.itemElement(maxIndex));
-    this._element.style.width = UI.measurePreferredSize(element, this._element).width + 'px';
+    this._element.style.width =
+        UI.measurePreferredSize(this._viewport.elementAtIndex(maxIndex), this._element).width + 'px';
   }
 
   /**
    * @param {!Event} event
    */
   _onBoxMouseDown(event) {
     if (this._hideTimeoutId) {
       window.clearTimeout(this._hideTimeoutId);
       delete this._hideTimeoutId;
     }
     event.preventDefault();
   }
 
   _maybeHide() {
     if (!this._hideTimeoutId)
       this._hideTimeoutId = window.setTimeout(this.hide.bind(this), 0);
   }
 
   /**
    * // FIXME: make SuggestBox work for multiple documents.
    * @suppressGlobalPropertiesCheck
    */
   _show() {
     if (this.visible())
       return;
     this._bodyElement = document.body;
     this._bodyElement.addEventListener('mousedown', this._maybeHideBound, true);
     this._overlay = new UI.SuggestBox.Overlay();
     this._overlay.setContentElement(this._container);
-    var measuringElement = this._createItemElement('1', '12');
-    this._viewport.element.appendChild(measuringElement);
-    this._rowHeight = measuringElement.getBoundingClientRect().height;
-    measuringElement.remove();
   }
 
   hide() {
     if (!this.visible())
       return;
 
     this._userInteracted = false;
     this._bodyElement.removeEventListener('mousedown', this._maybeHideBound, true);
     delete this._bodyElement;
     this._container.remove();
@@ skipping 42 matching lines @@
 
     return true;
   }
 
   /**
    * @param {number} shift
    * @param {boolean=} isCircular
    * @return {boolean} is changed
    */
   _selectClosest(shift, isCircular) {
-    if (!this._length)
+    var length = this._viewport.length();
+    if (!length)
       return false;
 
     this._userInteracted = true;
 
     if (this._selectedIndex === -1 && shift < 0)
       shift += 1;
 
     var index = this._selectedIndex + shift;
 
     if (isCircular)
-      index = (this._length + index) % this._length;
+      index = (length + index) % length;
     else
-      index = Number.constrain(index, 0, this._length - 1);
+      index = Number.constrain(index, 0, length - 1);
 
     this._selectItem(index);
     return true;
   }
 
   /**
    * @param {!Event} event
    */
   _onItemMouseDown(event) {
     this._selectedElement = event.currentTarget;
     this.acceptSuggestion();
     event.consume(true);
   }
 
   /**
-   * @param {string} query
-   * @param {string} title
-   * @param {string=} subtitle
-   * @param {string=} iconType
-   * @param {boolean=} isSecondary
+   * @param {!UI.SuggestBox.Suggestion} item
    * @return {!Element}
    */
-  _createItemElement(query, title, subtitle, iconType, isSecondary) {
+  _createItemElement(item) {
+    var query = this._userEnteredText;
     var element = createElementWithClass('div', 'suggest-box-content-item source-code');
-    if (iconType) {
-      var icon = UI.Icon.create(iconType, 'suggestion-icon');
+    if (item.iconType) {
+      var icon = UI.Icon.create(item.iconType, 'suggestion-icon');
       element.appendChild(icon);
     }
-    if (isSecondary)
+    if (item.isSecondary)
       element.classList.add('secondary');
     element.tabIndex = -1;
-    var displayText = title.trimEnd(50 + query.length);
+    var displayText = item.title.trimEnd(50 + query.length);
 
     var titleElement = element.createChild('span', 'suggestion-title');
     var index = displayText.toLowerCase().indexOf(query.toLowerCase());
     if (index > 0)
       titleElement.createChild('span').textContent = displayText.substring(0, index);
     if (index > -1)
       titleElement.createChild('span', 'query').textContent = displayText.substring(index, index + query.length);
     titleElement.createChild('span').textContent = displayText.substring(index > -1 ? index + query.length : 0);
     titleElement.createChild('span', 'spacer');
-    if (subtitle) {
+    if (item.subtitle) {
       var subtitleElement = element.createChild('span', 'suggestion-subtitle');
-      subtitleElement.textContent = subtitle.trimEnd(15);
+      subtitleElement.textContent = item.subtitle.trimEnd(15);
     }
-    element.__fullValue = title;
+    element.__fullValue = item.title;
     element.addEventListener('mousedown', this._onItemMouseDown.bind(this), false);
     return element;
   }
 
   /**
-   * @param {!UI.SuggestBox.Suggestions} items
-   * @param {string} userEnteredText
-   * @param {function(number): !Promise<{detail:string, description:string}>=} asyncDetails
-   */
-  _updateItems(items, userEnteredText, asyncDetails) {
-    this._length = items.length;
-    this._asyncDetailsPromises.clear();
-    this._asyncDetailsCallback = asyncDetails;
-    this._elementList = [];
-    delete this._selectedElement;
-
-    this._userEnteredText = userEnteredText;
-    this._items = items;
-  }
-
-  /**
    * @param {number} index
    * @return {!Promise<?{detail: string, description: string}>}
    */
   _asyncDetails(index) {
     if (!this._asyncDetailsCallback)
       return Promise.resolve(/** @type {?{description: string, detail: string}} */ (null));
     if (!this._asyncDetailsPromises.has(index))
       this._asyncDetailsPromises.set(index, this._asyncDetailsCallback(index));
     return /** @type {!Promise<?{detail: string, description: string}>} */ (this._asyncDetailsPromises.get(index));
   }
@@ skipping 16 matching lines @@
   _selectItem(index) {
     if (this._selectedElement) {
       this._selectedElement.classList.remove('selected');
       this._selectedElement.classList.remove('force-white-icons');
     }
 
     this._selectedIndex = index;
     if (index < 0)
       return;
 
-    this._selectedElement = this.itemElement(index);
+    this._selectedElement = this._viewport.elementAtIndex(index);
     this._selectedElement.classList.add('selected');
     this._selectedElement.classList.add('force-white-icons');
     this._detailsPopup.classList.add('hidden');
     var elem = this._selectedElement;
     this._asyncDetails(index).then(showDetails.bind(this), function() {});
 
-    this._viewport.scrollItemIntoView(index);
+    this._viewport.scrollItemAtIndexIntoView(index);
     this._applySuggestion(true);
 
     /**
      * @param {?{detail: string, description: string}} details
      * @this {UI.SuggestBox}
      */
     function showDetails(details) {
       if (elem === this._selectedElement)
         this._showDetailsPopup(details);
     }
@@ skipping 12 matching lines @@
     if (completions.length > 1)
       return true;
 
     if (!completions[0].title.startsWith(userEnteredText))
       return true;
 
     // Do not show a single suggestion if it is the same as user-entered query, even if allowed to show single-item suggest boxes.
     return canShowForSingleItem && completions[0].title !== userEnteredText;
   }
 
-  _ensureRowCountPerViewport() {
-    if (this._rowCountPerViewport)
-      return;
-    if (!this._items.length)
-      return;
-
-    this._rowCountPerViewport = Math.floor(this._element.getBoundingClientRect().height / this._rowHeight);
-  }
-
   /**
    * @param {!AnchorBox} anchorBox
    * @param {!UI.SuggestBox.Suggestions} completions
    * @param {boolean} selectHighestPriority
    * @param {boolean} canShowForSingleItem
    * @param {string} userEnteredText
    * @param {function(number): !Promise<{detail:string, description:string}>=} asyncDetails
    */
   updateSuggestions(
       anchorBox,
       completions,
       selectHighestPriority,
       canShowForSingleItem,
       userEnteredText,
       asyncDetails) {
     delete this._onlyCompletion;
     if (this._canShowBox(completions, canShowForSingleItem, userEnteredText)) {
-      this._updateItems(completions, userEnteredText, asyncDetails);
+      this._asyncDetailsPromises.clear();
+      this._asyncDetailsCallback = asyncDetails;
+      delete this._selectedElement;
+      this._userEnteredText = userEnteredText;
+      this._viewport.setFixedMeasuredHeights();
+      this._viewport.replaceAllItems(completions);
       this._show();
       this._updateBoxPosition(anchorBox);
+      this._viewport.slowRefresh();
       this._updateWidth();
-      this._viewport.refresh();
       var highestPriorityItem = -1;
       if (selectHighestPriority) {
         var highestPriority = -Infinity;
         for (var i = 0; i < completions.length; i++) {
           var priority = completions[i].priority || 0;
           if (highestPriority < priority) {
             highestPriority = priority;
             highestPriorityItem = i;
           }
         }
       }
       this._selectItem(highestPriorityItem);
-      delete this._rowCountPerViewport;
     } else {
       if (completions.length === 1) {
         this._onlyCompletion = completions[0].title;
         this._applySuggestion(true);
       }
       this.hide();
     }
   }
 
   /**
@@ skipping 27 matching lines @@
    * @return {boolean}
    */
   downKeyPressed() {
     return this._selectClosest(1, true);
   }
 
   /**
    * @return {boolean}
    */
   pageUpKeyPressed() {
-    this._ensureRowCountPerViewport();
-    return this._selectClosest(-this._rowCountPerViewport, false);
+    return this._selectClosest(-this._viewport.elementsPerViewport(), false);
   }
 
   /**
    * @return {boolean}
    */
   pageDownKeyPressed() {
-    this._ensureRowCountPerViewport();
-    return this._selectClosest(this._rowCountPerViewport, false);
+    return this._selectClosest(this._viewport.elementsPerViewport(), false);
   }
 
   /**
    * @return {boolean}
    */
   enterKeyPressed() {
     if (!this._userInteracted && this._captureEnter)
       return false;
 
     var hasSelectedItem = !!this._selectedElement || this._onlyCompletion;
     this.acceptSuggestion();
 
     // Report the event as non-handled if there is no selected item,
     // to commit the input or handle it otherwise.
     return hasSelectedItem;
   }
-
-  /**
-   * @override
-   * @param {number} index
-   * @return {number}
-   */
-  fastItemHeight(index) {
-    return this._rowHeight;
-  }
-
-  /**
-   * @override
-   * @return {number}
-   */
-  itemCount() {
-    return this._items.length;
-  }
-
-  /**
-   * @override
-   * @param {number} index
-   * @return {?Element}
-   */
-  itemElement(index) {
-    if (!this._elementList[index]) {
-      this._elementList[index] = this._createItemElement(
-          this._userEnteredText, this._items[index].title, this._items[index].subtitle, this._items[index].iconType,
-          this._items[index].isSecondary);
-    }
-    return this._elementList[index];
-  }
 };
 
 /**
- * @typedef {!Array.<{title: string, subtitle: (string|undefined), iconType: (string|undefined), priority: (number|undefined), isSecondary: (boolean|undefined)}>}
+ * @typedef {!{title: string, subtitle: (string|undefined), iconType: (string|undefined), priority: (number|undefined), isSecondary: (boolean|undefined)}}
+ */
+UI.SuggestBox.Suggestion;
+
+/**
+ * @typedef {!Array<!UI.SuggestBox.Suggestion>}
  */
 UI.SuggestBox.Suggestions;
 
 /**
  * @unrestricted
  */
 UI.SuggestBox.Overlay = class {
   /**
    * // FIXME: make SuggestBox work for multiple documents.
    * @suppressGlobalPropertiesCheck
@@ skipping 46 matching lines @@
     this.element.style.left = containerBox.x + 'px';
     this.element.style.top = containerBox.y + 'px';
     this.element.style.height = containerBox.height + 'px';
     this.element.style.width = containerBox.width + 'px';
   }
 
   dispose() {
     this.element.remove();
   }
 };