DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (5350524bb654)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*
 * This module adjusts network priority for tabs in a way that gives 'important'
 * tabs a higher priority. There are 3 levels of priority. Each is listed below
 * with the priority adjustment used.
 *
 * Highest (-10): Selected tab in the focused window.
 * Medium (0):    Background tabs in the focused window.
 *                Selected tab in background windows.
 * Lowest (+10):  Background tabs in background windows.
 */

this.EXPORTED_SYMBOLS = ["trackBrowserWindow"];

const Ci = Components.interfaces;

Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");


// Lazy getters
XPCOMUtils.defineLazyServiceGetter(this, "_focusManager",
                                   "@mozilla.org/focus-manager;1",
                                   "nsIFocusManager");


// Constants
const TAB_EVENTS = ["TabBrowserInserted", "TabSelect", "TabRemotenessChange"];
const WINDOW_EVENTS = ["activate", "unload"];
// lower value means higher priority
const PRIORITY_DELTA = Ci.nsISupportsPriority.PRIORITY_NORMAL - Ci.nsISupportsPriority.PRIORITY_LOW;


// Variables
var _lastFocusedWindow = null;
var _windows = [];
// this is used for restoring the priority after TabRemotenessChange
var _priorityBackup = new WeakMap();


// Exported symbol
this.trackBrowserWindow = function trackBrowserWindow(aWindow) {
  WindowHelper.addWindow(aWindow);
}


// Global methods
function _handleEvent(aEvent) {
  switch (aEvent.type) {
    case "TabBrowserInserted":
      BrowserHelper.onOpen(aEvent.target.linkedBrowser);
      break;
    case "TabSelect":
      BrowserHelper.onSelect(aEvent.target.linkedBrowser);
      break;
    case "activate":
      WindowHelper.onActivate(aEvent.target);
      break;
    case "TabRemotenessChange":
      BrowserHelper.onRemotenessChange(aEvent.target.linkedBrowser);
      break;
    case "unload":
      WindowHelper.removeWindow(aEvent.currentTarget);
      break;
  }
}


// Methods that impact a browser. Put into single object for organization.
var BrowserHelper = {
  onOpen: function NP_BH_onOpen(aBrowser) {
    _priorityBackup.set(aBrowser.permanentKey, Ci.nsISupportsPriority.PRIORITY_NORMAL);

    // If the tab is in the focused window, leave priority as it is
    if (aBrowser.ownerGlobal != _lastFocusedWindow)
      this.decreasePriority(aBrowser);
  },

  onSelect: function NP_BH_onSelect(aBrowser) {
    let windowEntry = WindowHelper.getEntry(aBrowser.ownerGlobal);
    if (windowEntry.lastSelectedBrowser)
      this.decreasePriority(windowEntry.lastSelectedBrowser);
    this.increasePriority(aBrowser);

    windowEntry.lastSelectedBrowser = aBrowser;
  },

  onRemotenessChange: function (aBrowser) {
    aBrowser.setPriority(_priorityBackup.get(aBrowser.permanentKey));
  },

  increasePriority: function NP_BH_increasePriority(aBrowser) {
    aBrowser.adjustPriority(PRIORITY_DELTA);
    _priorityBackup.set(aBrowser.permanentKey,
                        _priorityBackup.get(aBrowser.permanentKey) + PRIORITY_DELTA);
  },

  decreasePriority: function NP_BH_decreasePriority(aBrowser) {
    aBrowser.adjustPriority(PRIORITY_DELTA * -1);
    _priorityBackup.set(aBrowser.permanentKey,
                        _priorityBackup.get(aBrowser.permanentKey) - PRIORITY_DELTA);
  }
};


// Methods that impact a window. Put into single object for organization.
var WindowHelper = {
  addWindow: function NP_WH_addWindow(aWindow) {
    // Build internal data object
    _windows.push({ window: aWindow, lastSelectedBrowser: null });

    // Add event listeners
    TAB_EVENTS.forEach(function(event) {
      aWindow.gBrowser.tabContainer.addEventListener(event, _handleEvent, false);
    });
    WINDOW_EVENTS.forEach(function(event) {
      aWindow.addEventListener(event, _handleEvent, false);
    });

    // This gets called AFTER activate event, so if this is the focused window
    // we want to activate it. Otherwise, deprioritize it.
    if (aWindow == _focusManager.activeWindow)
      this.handleFocusedWindow(aWindow);
    else
      this.decreasePriority(aWindow);

    // Select the selected tab
    BrowserHelper.onSelect(aWindow.gBrowser.selectedBrowser);
  },

  removeWindow: function NP_WH_removeWindow(aWindow) {
    if (aWindow == _lastFocusedWindow)
      _lastFocusedWindow = null;

    // Delete this window from our tracking
    _windows.splice(this.getEntryIndex(aWindow), 1);

    // Remove the event listeners
    TAB_EVENTS.forEach(function(event) {
      aWindow.gBrowser.tabContainer.removeEventListener(event, _handleEvent, false);
    });
    WINDOW_EVENTS.forEach(function(event) {
      aWindow.removeEventListener(event, _handleEvent, false);
    });
  },

  onActivate: function NP_WH_onActivate(aWindow, aHasFocus) {
    // If this window was the last focused window, we don't need to do anything
    if (aWindow == _lastFocusedWindow)
      return;

    // handleFocusedWindow will deprioritize the current window
    this.handleFocusedWindow(aWindow);

    // Lastly we should increase priority for this window
    this.increasePriority(aWindow);
  },

  handleFocusedWindow: function NP_WH_handleFocusedWindow(aWindow) {
    // If we have a last focused window, we need to deprioritize it first
    if (_lastFocusedWindow)
      this.decreasePriority(_lastFocusedWindow);

    // aWindow is now focused
    _lastFocusedWindow = aWindow;
  },

  // Auxiliary methods
  increasePriority: function NP_WH_increasePriority(aWindow) {
    aWindow.gBrowser.browsers.forEach(function(aBrowser) {
      BrowserHelper.increasePriority(aBrowser);
    });
  },

  decreasePriority: function NP_WH_decreasePriority(aWindow) {
    aWindow.gBrowser.browsers.forEach(function(aBrowser) {
      BrowserHelper.decreasePriority(aBrowser);
    });
  },

  getEntry: function NP_WH_getEntry(aWindow) {
    return _windows[this.getEntryIndex(aWindow)];
  },

  getEntryIndex: function NP_WH_getEntryAtIndex(aWindow) {
    // Assumes that every object has a unique window & it's in the array
    for (let i = 0; i < _windows.length; i++)
      if (_windows[i].window == aWindow)
        return i;
  }
};