1 files changed, 405 insertions, 0 deletions
diff --git a/data/extensions/spyblock@gnu.org/lib/child/objectTabs.js b/data/extensions/spyblock@gnu.org/lib/child/objectTabs.js
new file mode 100644
index 0000000..74e7387
--- /dev/null
+++ b/data/extensions/spyblock@gnu.org/lib/child/objectTabs.js
@@ -0,0 +1,405 @@
+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-2017 eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * @fileOverview Code responsible for showing and hiding object tabs.
+ */
+
+let {port} = require("messaging");
+
+/**
+ * Class responsible for showing and hiding object tabs.
+ * @class
+ */
+var objTabs =
+{
+  /**
+   * Number of milliseconds to wait until hiding tab after the mouse moves away.
+   * @type Integer
+   */
+  HIDE_DELAY: 1000,
+
+  /**
+   * Document element the object tab is currently being displayed for.
+   * @type Element
+   */
+  currentElement: null,
+
+  /**
+   * Windows that the window event handler is currently registered for.
+   * @type Window[]
+   */
+  windowListeners: null,
+
+  /**
+   * Panel element currently used as object tab.
+   * @type Element
+   */
+  objtabElement: null,
+
+  /**
+   * Time of previous position update.
+   * @type Integer
+   */
+  prevPositionUpdate: 0,
+
+  /**
+   * Timer used to update position of the object tab.
+   * @type nsITimer
+   */
+  positionTimer: null,
+
+  /**
+   * Timer used to delay hiding of the object tab.
+   * @type nsITimer
+   */
+  hideTimer: null,
+
+  /**
+   * Used when hideTimer is running, time when the tab should be hidden.
+   * @type Integer
+   */
+  hideTargetTime: 0,
+
+  /**
+   * Localized texts and class names to be used for the tab. This will be set
+   * when showTabFor is called for the first time.
+   * @type Object
+   */
+  texts: null,
+
+  /**
+   * Called to show object tab for an element.
+   */
+  showTabFor: function(/**Element*/ element)
+  {
+    // Object tabs aren't usable in Fennec
+    let {application} = require("info");
+    if (application == "fennec" || application == "fennec2" ||
+        application == "adblockbrowser")
+      return;
+
+    if (!this.texts)
+      this.texts = port.emitWithResponse("getObjectTabsTexts");
+    Promise.all([port.emitWithResponse("getObjectTabsStatus"), this.texts])
+        .then(([status, texts]) =>
+    {
+      this.texts = texts;
+      if (!status)
+        return;
+
+      if (this.hideTimer)
+      {
+        this.hideTimer.cancel();
+        this.hideTimer = null;
+      }
+
+      if (this.objtabElement)
+        this.objtabElement.style.setProperty("opacity", "1", "important");
+
+      if (this.currentElement != element)
+      {
+        this._hideTab();
+
+        let {RequestNotifier} = require("child/requestNotifier");
+        let data = RequestNotifier.getDataForNode(element, true, "OBJECT");
+        if (data)
+          this._showTab(element, data[1]);
+      }
+    });
+  },
+
+  /**
+   * Called to hide object tab for an element (actual hiding happens delayed).
+   */
+  hideTabFor: function(/**Element*/ element)
+  {
+    if (element != this.currentElement || this.hideTimer)
+      return;
+
+    this.hideTargetTime = Date.now() + this.HIDE_DELAY;
+    this.hideTimer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
+    this.hideTimer.init(this, 40, Ci.nsITimer.TYPE_REPEATING_SLACK);
+  },
+
+  /**
+   * Makes the tab element visible.
+   * @param {Element} element
+   * @param {RequestEntry} data
+   */
+  _showTab: function(element, data)
+  {
+    let doc = element.ownerDocument.defaultView.top.document;
+
+    this.objtabElement = doc.createElementNS("http://www.w3.org/1999/xhtml", "a");
+    this.objtabElement.textContent = this.texts.label;
+    this.objtabElement.setAttribute("title", this.texts.tooltip);
+    this.objtabElement.setAttribute("href", data.location);
+    this.objtabElement.setAttribute("class", this.texts.classHidden);
+    this.objtabElement.style.setProperty("opacity", "1", "important");
+    this.objtabElement.nodeData = data;
+
+    this.currentElement = element;
+
+    // Register paint listeners for the relevant windows
+    this.windowListeners = [];
+    let wnd = element.ownerDocument.defaultView;
+    while (wnd)
+    {
+      wnd.addEventListener("MozAfterPaint", objectWindowEventHandler, false);
+      this.windowListeners.push(wnd);
+      wnd = (wnd.parent != wnd ? wnd.parent : null);
+    }
+
+    // Register mouse listeners on the object tab
+    this.objtabElement.addEventListener("mouseover", objectTabEventHander, false);
+    this.objtabElement.addEventListener("mouseout", objectTabEventHander, false);
+    this.objtabElement.addEventListener("click", objectTabEventHander, true);
+
+    // Insert the tab into the document and adjust its position
+    doc.documentElement.appendChild(this.objtabElement);
+    if (!this.positionTimer)
+    {
+      this.positionTimer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
+      this.positionTimer.init(this, 200, Ci.nsITimer.TYPE_REPEATING_SLACK);
+    }
+    this._positionTab();
+  },
+
+  /**
+   * Hides the tab element.
+   */
+  _hideTab: function()
+  {
+    if (this.objtabElement)
+    {
+      // Prevent recursive calls via popuphidden handler
+      let objtab = this.objtabElement;
+      this.objtabElement = null;
+      this.currentElement = null;
+
+      if (this.hideTimer)
+      {
+        this.hideTimer.cancel();
+        this.hideTimer = null;
+      }
+
+      if (this.positionTimer)
+      {
+        this.positionTimer.cancel();
+        this.positionTimer = null;
+      }
+
+      try {
+        objtab.parentNode.removeChild(objtab);
+      } catch (e) {}
+      objtab.removeEventListener("mouseover", objectTabEventHander, false);
+      objtab.removeEventListener("mouseout", objectTabEventHander, false);
+      objtab.nodeData = null;
+
+      for (let wnd of this.windowListeners)
+        wnd.removeEventListener("MozAfterPaint", objectWindowEventHandler, false);
+      this.windowListeners = null;
+    }
+  },
+
+  /**
+   * Updates position of the tab element.
+   */
+  _positionTab: function()
+  {
+    // Test whether element is still in document
+    let elementDoc = null;
+    try
+    {
+      elementDoc = this.currentElement.ownerDocument;
+    } catch (e) {}  // Ignore "can't access dead object" error
+    if (!elementDoc || !this.currentElement.offsetWidth || !this.currentElement.offsetHeight ||
+        !elementDoc.defaultView || !elementDoc.documentElement)
+    {
+      this._hideTab();
+      return;
+    }
+
+    let objRect = this._getElementPosition(this.currentElement);
+
+    let className = this.texts.classVisibleTop;
+    let left = objRect.right - this.objtabElement.offsetWidth;
+    let top = objRect.top - this.objtabElement.offsetHeight;
+    if (top < 0)
+    {
+      top = objRect.bottom;
+      className = this.texts.classVisibleBottom;
+    }
+
+    if (this.objtabElement.style.left != left + "px")
+      this.objtabElement.style.setProperty("left", left + "px", "important");
+    if (this.objtabElement.style.top != top + "px")
+      this.objtabElement.style.setProperty("top", top + "px", "important");
+
+    if (this.objtabElement.getAttribute("class") != className)
+      this.objtabElement.setAttribute("class", className);
+
+    this.prevPositionUpdate = Date.now();
+  },
+
+  /**
+   * Calculates element's position relative to the top frame and considering
+   * clipping due to scrolling.
+   * @return {{left: Number, top: Number, right: Number, bottom: Number}}
+   */
+  _getElementPosition: function(/**Element*/ element)
+  {
+    // Restrict rectangle coordinates by the boundaries of a window's client area
+    function intersectRect(rect, wnd)
+    {
+      // Cannot use wnd.innerWidth/Height because they won't account for scrollbars
+      let doc = wnd.document;
+      let wndWidth = doc.documentElement.clientWidth;
+      let wndHeight = doc.documentElement.clientHeight;
+      if (doc.compatMode == "BackCompat") // clientHeight will be bogus in quirks mode
+        wndHeight = Math.max(doc.documentElement.offsetHeight, doc.body.offsetHeight) - wnd.scrollMaxY - 1;
+
+      rect.left = Math.max(rect.left, 0);
+      rect.top = Math.max(rect.top, 0);
+      rect.right = Math.min(rect.right, wndWidth);
+      rect.bottom = Math.min(rect.bottom, wndHeight);
+    }
+
+    let rect = element.getBoundingClientRect();
+    let wnd = element.ownerDocument.defaultView;
+
+    let style = wnd.getComputedStyle(element, null);
+    let offsets = [
+      parseFloat(style.borderLeftWidth) + parseFloat(style.paddingLeft),
+      parseFloat(style.borderTopWidth) + parseFloat(style.paddingTop),
+      parseFloat(style.borderRightWidth) + parseFloat(style.paddingRight),
+      parseFloat(style.borderBottomWidth) + parseFloat(style.paddingBottom)
+    ];
+
+    rect = {left: rect.left + offsets[0], top: rect.top + offsets[1],
+            right: rect.right - offsets[2], bottom: rect.bottom - offsets[3]};
+    while (true)
+    {
+      intersectRect(rect, wnd);
+
+      if (!wnd.frameElement)
+        break;
+
+      // Recalculate coordinates to be relative to frame's parent window
+      let frameElement = wnd.frameElement;
+      wnd = frameElement.ownerDocument.defaultView;
+
+      let frameRect = frameElement.getBoundingClientRect();
+      let frameStyle = wnd.getComputedStyle(frameElement, null);
+      let relLeft = frameRect.left + parseFloat(frameStyle.borderLeftWidth) + parseFloat(frameStyle.paddingLeft);
+      let relTop = frameRect.top + parseFloat(frameStyle.borderTopWidth) + parseFloat(frameStyle.paddingTop);
+
+      rect.left += relLeft;
+      rect.right += relLeft;
+      rect.top += relTop;
+      rect.bottom += relTop;
+    }
+
+    return rect;
+  },
+
+  doBlock: function()
+  {
+    let {storeNodes} = require("child/contentPolicy");
+    let nodesID = storeNodes([this.currentElement]);
+    port.emit("blockItem", {
+      request: this.objtabElement.nodeData,
+      nodesID
+    });
+  },
+
+  /**
+   * Called whenever a timer fires.
+   * @param {nsISupport} subject
+   * @param {string} topic
+   * @param {string} data
+   */
+  observe: function(subject, topic, data)
+  {
+    if (subject == this.positionTimer)
+    {
+      // Don't update position if it was already updated recently (via MozAfterPaint)
+      if (Date.now() - this.prevPositionUpdate > 100)
+        this._positionTab();
+    }
+    else if (subject == this.hideTimer)
+    {
+      let now = Date.now();
+      if (now >= this.hideTargetTime)
+        this._hideTab();
+      else if (this.hideTargetTime - now < this.HIDE_DELAY / 2)
+        this.objtabElement.style.setProperty("opacity", (this.hideTargetTime - now) * 2 / this.HIDE_DELAY, "important");
+    }
+  }
+};
+
+onShutdown.add(objTabs._hideTab.bind(objTabs));
+
+/**
+ * Function called whenever the mouse enters or leaves an object.
+ */
+function objectMouseEventHander(/**Event*/ event)
+{
+  if (!event.isTrusted)
+    return;
+
+  if (event.type == "mouseover")
+    objTabs.showTabFor(event.target);
+  else if (event.type == "mouseout")
+    objTabs.hideTabFor(event.target);
+}
+
+/**
+ * Function called for paint events of the object tab window.
+ */
+function objectWindowEventHandler(/**Event*/ event)
+{
+  if (!event.isTrusted)
+    return;
+
+  // Don't trigger update too often, avoid overusing CPU on frequent page updates
+  if (event.type == "MozAfterPaint" && Date.now() - objTabs.prevPositionUpdate > 20)
+    objTabs._positionTab();
+}
+
+/**
+ * Function called whenever the mouse enters or leaves an object tab.
+ */
+function objectTabEventHander(/**Event*/ event)
+{
+  if (onShutdown.done || !event.isTrusted)
+    return;
+
+  if (event.type == "click" && event.button == 0)
+  {
+    event.preventDefault();
+    event.stopPropagation();
+
+    objTabs.doBlock();
+  }
+  else if (event.type == "mouseover")
+    objTabs.showTabFor(objTabs.currentElement);
+  else if (event.type == "mouseout")
+    objTabs.hideTabFor(objTabs.currentElement);
+}
+exports.objectMouseEventHander = objectMouseEventHander;