Demo/bin/Debug/front_end/ui/ViewportControl.js

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/*
 * 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
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * @constructor
 * @param {!WebInspector.ViewportControl.Provider} provider
 */
WebInspector.ViewportControl = function(provider)
{
    this.element = createElement("div");
    this.element.style.overflow = "auto";
    this._topGapElement = this.element.createChild("div", "viewport-control-gap-element");
    this._topGapElement.textContent = ".";
    this._topGapElement.style.height = "0px";
    this._contentElement = this.element.createChild("div");
    this._bottomGapElement = this.element.createChild("div", "viewport-control-gap-element");
    this._bottomGapElement.textContent = ".";
    this._bottomGapElement.style.height = "0px";

    this._provider = provider;
    this.element.addEventListener("scroll", this._onScroll.bind(this), false);
    this.element.addEventListener("copy", this._onCopy.bind(this), false);
    this.element.addEventListener("dragstart", this._onDragStart.bind(this), false);

    this._firstVisibleIndex = 0;
    this._lastVisibleIndex = -1;
    this._renderedItems = [];
    this._anchorSelection = null;
    this._headSelection = null;
    this._stickToBottom = false;
    this._scrolledToBottom = true;
}