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Tabs.java
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Tabs.java
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/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
* 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/. */
package org.mozilla.gecko;
import org.mozilla.gecko.db.BrowserDB;
import org.mozilla.gecko.sync.setup.SyncAccounts;
import org.mozilla.gecko.util.GeckoEventListener;
import org.mozilla.gecko.util.ThreadUtils;
import org.json.JSONObject;
import android.accounts.Account;
import android.accounts.AccountManager;
import android.accounts.OnAccountsUpdateListener;
import android.content.ContentResolver;
import android.database.ContentObserver;
import android.graphics.Color;
import android.net.Uri;
import android.util.Log;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.atomic.AtomicInteger;
public class Tabs implements GeckoEventListener {
private static final String LOGTAG = "GeckoTabs";
// mOrder and mTabs are always of the same cardinality, and contain the same values.
private final CopyOnWriteArrayList<Tab> mOrder = new CopyOnWriteArrayList<Tab>();
// All writes to mSelectedTab must be synchronized on the Tabs instance.
// In general, it's preferred to always use selectTab()).
private volatile Tab mSelectedTab;
// All accesses to mTabs must be synchronized on the Tabs instance.
private final HashMap<Integer, Tab> mTabs = new HashMap<Integer, Tab>();
// Keeps track of how much has happened since we last updated our persistent tab store.
private volatile int mScore = 0;
private AccountManager mAccountManager;
private OnAccountsUpdateListener mAccountListener = null;
public static final int LOADURL_NONE = 0;
public static final int LOADURL_NEW_TAB = 1;
public static final int LOADURL_USER_ENTERED = 2;
public static final int LOADURL_PRIVATE = 4;
public static final int LOADURL_PINNED = 8;
public static final int LOADURL_DELAY_LOAD = 16;
public static final int LOADURL_DESKTOP = 32;
public static final int LOADURL_BACKGROUND = 64;
private static final int SCORE_INCREMENT_TAB_LOCATION_CHANGE = 5;
private static final int SCORE_INCREMENT_TAB_SELECTED = 10;
private static final int SCORE_THRESHOLD = 30;
private static AtomicInteger sTabId = new AtomicInteger(0);
private volatile boolean mInitialTabsAdded;
private GeckoApp mActivity;
private ContentObserver mContentObserver;
private Tabs() {
registerEventListener("Session:RestoreEnd");
registerEventListener("SessionHistory:New");
registerEventListener("SessionHistory:Back");
registerEventListener("SessionHistory:Forward");
registerEventListener("SessionHistory:Goto");
registerEventListener("SessionHistory:Purge");
registerEventListener("Tab:Added");
registerEventListener("Tab:Close");
registerEventListener("Tab:Select");
registerEventListener("Content:LocationChange");
registerEventListener("Content:SecurityChange");
registerEventListener("Content:ReaderEnabled");
registerEventListener("Content:StateChange");
registerEventListener("Content:LoadError");
registerEventListener("Content:PageShow");
registerEventListener("DOMContentLoaded");
registerEventListener("DOMTitleChanged");
registerEventListener("DOMLinkAdded");
registerEventListener("DesktopMode:Changed");
}
public synchronized void attachToActivity(GeckoApp activity) {
if (mActivity == activity) {
return;
}
if (mActivity != null) {
detachFromActivity(mActivity);
}
mActivity = activity;
mAccountManager = AccountManager.get(mActivity);
mAccountListener = new OnAccountsUpdateListener() {
@Override
public void onAccountsUpdated(Account[] accounts) {
persistAllTabs();
}
};
// The listener will run on the background thread (see 2nd argument).
mAccountManager.addOnAccountsUpdatedListener(mAccountListener, ThreadUtils.getBackgroundHandler(), false);
if (mContentObserver != null) {
BrowserDB.registerBookmarkObserver(getContentResolver(), mContentObserver);
}
}
// Ideally, this would remove the reference to the activity once it's
// detached; however, we have lifecycle issues with GeckoApp and Tabs that
// requires us to keep it around (see
// https://bugzilla.mozilla.org/show_bug.cgi?id=844407).
public synchronized void detachFromActivity(GeckoApp activity) {
if (mContentObserver != null) {
BrowserDB.unregisterContentObserver(getContentResolver(), mContentObserver);
}
if (mAccountListener != null) {
mAccountManager.removeOnAccountsUpdatedListener(mAccountListener);
mAccountListener = null;
}
}
/**
* Gets the tab count corresponding to the private state of the selected
* tab.
*
* If the selected tab is a non-private tab, this will return the number of
* non-private tabs; likewise, if this is a private tab, this will return
* the number of private tabs.
*
* @return the number of tabs in the current private state
*/
public synchronized int getDisplayCount() {
// Once mSelectedTab is non-null, it cannot be null for the remainder
// of the object's lifetime.
boolean getPrivate = mSelectedTab != null && mSelectedTab.isPrivate();
int count = 0;
for (Tab tab : mOrder) {
if (tab.isPrivate() == getPrivate) {
count++;
}
}
return count;
}
// Must be synchronized to avoid racing on mContentObserver.
private void lazyRegisterBookmarkObserver() {
if (mContentObserver == null) {
mContentObserver = new ContentObserver(null) {
@Override
public void onChange(boolean selfChange) {
for (Tab tab : mOrder) {
tab.updateBookmark();
}
}
};
BrowserDB.registerBookmarkObserver(getContentResolver(), mContentObserver);
}
}
private Tab addTab(int id, String url, boolean external, int parentId, String title, boolean isPrivate) {
final Tab tab = isPrivate ? new PrivateTab(mActivity, id, url, external, parentId, title) :
new Tab(mActivity, id, url, external, parentId, title);
synchronized (this) {
lazyRegisterBookmarkObserver();
mTabs.put(id, tab);
mOrder.add(tab);
}
// Suppress the ADDED event to prevent animation of tabs created via session restore.
if (mInitialTabsAdded) {
notifyListeners(tab, TabEvents.ADDED);
}
return tab;
}
public synchronized void removeTab(int id) {
if (mTabs.containsKey(id)) {
Tab tab = getTab(id);
mOrder.remove(tab);
mTabs.remove(id);
}
}
public synchronized Tab selectTab(int id) {
if (!mTabs.containsKey(id))
return null;
final Tab oldTab = getSelectedTab();
final Tab tab = mTabs.get(id);
// This avoids a NPE below, but callers need to be careful to
// handle this case.
if (tab == null || oldTab == tab) {
return null;
}
mSelectedTab = tab;
notifyListeners(tab, TabEvents.SELECTED);
if (oldTab != null) {
notifyListeners(oldTab, TabEvents.UNSELECTED);
}
// Pass a message to Gecko to update tab state in BrowserApp.
GeckoAppShell.sendEventToGecko(GeckoEvent.createBroadcastEvent("Tab:Selected", String.valueOf(tab.getId())));
return tab;
}
private int getIndexOf(Tab tab) {
return mOrder.lastIndexOf(tab);
}
private Tab getNextTabFrom(Tab tab, boolean getPrivate) {
int numTabs = mOrder.size();
int index = getIndexOf(tab);
for (int i = index + 1; i < numTabs; i++) {
Tab next = mOrder.get(i);
if (next.isPrivate() == getPrivate) {
return next;
}
}
return null;
}
private Tab getPreviousTabFrom(Tab tab, boolean getPrivate) {
int numTabs = mOrder.size();
int index = getIndexOf(tab);
for (int i = index - 1; i >= 0; i--) {
Tab prev = mOrder.get(i);
if (prev.isPrivate() == getPrivate) {
return prev;
}
}
return null;
}
/**
* Gets the selected tab.
*
* The selected tab can be null if we're doing a session restore after a
* crash and Gecko isn't ready yet.
*
* @return the selected tab, or null if no tabs exist
*/
public Tab getSelectedTab() {
return mSelectedTab;
}
public boolean isSelectedTab(Tab tab) {
return tab != null && tab == mSelectedTab;
}
public synchronized Tab getTab(int id) {
if (mTabs.size() == 0)
return null;
if (!mTabs.containsKey(id))
return null;
return mTabs.get(id);
}
/** Close tab and then select the default next tab */
public synchronized void closeTab(Tab tab) {
closeTab(tab, getNextTab(tab));
}
/** Close tab and then select nextTab */
public synchronized void closeTab(final Tab tab, Tab nextTab) {
if (tab == null)
return;
if (nextTab == null)
nextTab = loadUrl("about:home", LOADURL_NEW_TAB);
selectTab(nextTab.getId());
int tabId = tab.getId();
removeTab(tabId);
tab.onDestroy();
// Pass a message to Gecko to update tab state in BrowserApp
GeckoAppShell.sendEventToGecko(GeckoEvent.createBroadcastEvent("Tab:Closed", String.valueOf(tabId)));
}
/** Return the tab that will be selected by default after this one is closed */
public Tab getNextTab(Tab tab) {
Tab selectedTab = getSelectedTab();
if (selectedTab != tab)
return selectedTab;
boolean getPrivate = tab.isPrivate();
Tab nextTab = getNextTabFrom(tab, getPrivate);
if (nextTab == null)
nextTab = getPreviousTabFrom(tab, getPrivate);
if (nextTab == null && getPrivate) {
// If there are no private tabs remaining, get the last normal tab
Tab lastTab = mOrder.get(mOrder.size() - 1);
if (!lastTab.isPrivate()) {
nextTab = lastTab;
} else {
nextTab = getPreviousTabFrom(lastTab, false);
}
}
Tab parent = getTab(tab.getParentId());
if (parent != null) {
// If the next tab is a sibling, switch to it. Otherwise go back to the parent.
if (nextTab != null && nextTab.getParentId() == tab.getParentId())
return nextTab;
else
return parent;
}
return nextTab;
}
public Iterable<Tab> getTabsInOrder() {
return mOrder;
}
/**
* @return the current GeckoApp instance, or throws if
* we aren't correctly initialized.
*/
private synchronized GeckoApp getActivity() {
if (mActivity == null) {
throw new IllegalStateException("Tabs not initialized with a GeckoApp instance.");
}
return mActivity;
}
public ContentResolver getContentResolver() {
return getActivity().getContentResolver();
}
// Make Tabs a singleton class.
private static class TabsInstanceHolder {
private static final Tabs INSTANCE = new Tabs();
}
public static Tabs getInstance() {
return Tabs.TabsInstanceHolder.INSTANCE;
}
// GeckoEventListener implementation
@Override
public void handleMessage(String event, JSONObject message) {
try {
if (event.equals("Session:RestoreEnd")) {
notifyListeners(null, TabEvents.RESTORED);
return;
}
// All other events handled below should contain a tabID property
int id = message.getInt("tabID");
Tab tab = getTab(id);
// "Tab:Added" is a special case because tab will be null if the tab was just added
if (event.equals("Tab:Added")) {
String url = message.isNull("uri") ? null : message.getString("uri");
if (message.getBoolean("stub")) {
if (tab == null) {
// Tab was already closed; abort
return;
}
tab.updateURL(url);
} else {
tab = addTab(id, url, message.getBoolean("external"),
message.getInt("parentId"),
message.getString("title"),
message.getBoolean("isPrivate"));
}
if (message.getBoolean("selected"))
selectTab(id);
if (message.getBoolean("delayLoad"))
tab.setState(Tab.STATE_DELAYED);
if (message.getBoolean("desktopMode"))
tab.setDesktopMode(true);
return;
}
// Tab was already closed; abort
if (tab == null)
return;
if (event.startsWith("SessionHistory:")) {
event = event.substring("SessionHistory:".length());
tab.handleSessionHistoryMessage(event, message);
} else if (event.equals("Tab:Close")) {
closeTab(tab);
} else if (event.equals("Tab:Select")) {
selectTab(tab.getId());
} else if (event.equals("Content:LocationChange")) {
tab.handleLocationChange(message);
} else if (event.equals("Content:SecurityChange")) {
tab.updateIdentityData(message.getJSONObject("identity"));
notifyListeners(tab, TabEvents.SECURITY_CHANGE);
} else if (event.equals("Content:ReaderEnabled")) {
tab.setReaderEnabled(true);
notifyListeners(tab, TabEvents.READER_ENABLED);
} else if (event.equals("Content:StateChange")) {
int state = message.getInt("state");
if ((state & GeckoAppShell.WPL_STATE_IS_NETWORK) != 0) {
if ((state & GeckoAppShell.WPL_STATE_START) != 0) {
boolean showProgress = message.getBoolean("showProgress");
tab.handleDocumentStart(showProgress, message.getString("uri"));
notifyListeners(tab, Tabs.TabEvents.START, showProgress);
} else if ((state & GeckoAppShell.WPL_STATE_STOP) != 0) {
tab.handleDocumentStop(message.getBoolean("success"));
notifyListeners(tab, Tabs.TabEvents.STOP);
}
}
} else if (event.equals("Content:LoadError")) {
notifyListeners(tab, Tabs.TabEvents.LOAD_ERROR);
} else if (event.equals("Content:PageShow")) {
notifyListeners(tab, TabEvents.PAGE_SHOW);
} else if (event.equals("DOMContentLoaded")) {
String backgroundColor = message.getString("bgColor");
if (backgroundColor != null) {
tab.setBackgroundColor(backgroundColor);
} else {
// Default to white if no color is given
tab.setBackgroundColor(Color.WHITE);
}
notifyListeners(tab, Tabs.TabEvents.LOADED);
} else if (event.equals("DOMTitleChanged")) {
tab.updateTitle(message.getString("title"));
} else if (event.equals("DOMLinkAdded")) {
tab.updateFaviconURL(message.getString("href"), message.getInt("size"));
notifyListeners(tab, TabEvents.LINK_ADDED);
} else if (event.equals("DesktopMode:Changed")) {
tab.setDesktopMode(message.getBoolean("desktopMode"));
notifyListeners(tab, TabEvents.DESKTOP_MODE_CHANGE);
}
} catch (Exception e) {
Log.w(LOGTAG, "handleMessage threw for " + event, e);
}
}
public void refreshThumbnails() {
final ThumbnailHelper helper = ThumbnailHelper.getInstance();
ThreadUtils.postToBackgroundThread(new Runnable() {
@Override
public void run() {
for (final Tab tab : mOrder) {
helper.getAndProcessThumbnailFor(tab);
}
}
});
}
public interface OnTabsChangedListener {
public void onTabChanged(Tab tab, TabEvents msg, Object data);
}
private static List<OnTabsChangedListener> mTabsChangedListeners =
Collections.synchronizedList(new ArrayList<OnTabsChangedListener>());
public static void registerOnTabsChangedListener(OnTabsChangedListener listener) {
mTabsChangedListeners.add(listener);
}
public static void unregisterOnTabsChangedListener(OnTabsChangedListener listener) {
mTabsChangedListeners.remove(listener);
}
public enum TabEvents {
CLOSED,
START,
LOADED,
LOAD_ERROR,
STOP,
FAVICON,
THUMBNAIL,
TITLE,
SELECTED,
UNSELECTED,
ADDED,
RESTORED,
LOCATION_CHANGE,
MENU_UPDATED,
PAGE_SHOW,
LINK_ADDED,
SECURITY_CHANGE,
READER_ENABLED,
DESKTOP_MODE_CHANGE
}
public void notifyListeners(Tab tab, TabEvents msg) {
notifyListeners(tab, msg, "");
}
// Throws if not initialized.
public void notifyListeners(final Tab tab, final TabEvents msg, final Object data) {
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
onTabChanged(tab, msg, data);
synchronized (mTabsChangedListeners) {
if (mTabsChangedListeners.isEmpty()) {
return;
}
Iterator<OnTabsChangedListener> items = mTabsChangedListeners.iterator();
while (items.hasNext()) {
items.next().onTabChanged(tab, msg, data);
}
}
}
});
}
private void onTabChanged(Tab tab, Tabs.TabEvents msg, Object data) {
switch (msg) {
case LOCATION_CHANGE:
mScore += SCORE_INCREMENT_TAB_LOCATION_CHANGE;
break;
case RESTORED:
mInitialTabsAdded = true;
break;
// When one tab is deselected, another one is always selected, so only
// increment the score once. When tabs are added/closed, they are also
// selected/unselected, so it would be redundant to also listen
// for ADDED/CLOSED events.
case SELECTED:
mScore += SCORE_INCREMENT_TAB_SELECTED;
case UNSELECTED:
tab.onChange();
break;
default:
break;
}
if (mScore > SCORE_THRESHOLD) {
persistAllTabs();
mScore = 0;
}
}
// This method persists the current ordered list of tabs in our tabs content provider.
public void persistAllTabs() {
final GeckoApp activity = getActivity();
final Iterable<Tab> tabs = getTabsInOrder();
ThreadUtils.postToBackgroundThread(new Runnable() {
@Override
public void run() {
boolean syncIsSetup = SyncAccounts.syncAccountsExist(activity);
if (syncIsSetup) {
TabsAccessor.persistLocalTabs(getContentResolver(), tabs);
}
}
});
}
private void registerEventListener(String event) {
GeckoAppShell.getEventDispatcher().registerEventListener(event, this);
}
/**
* Loads a tab with the given URL in the currently selected tab.
*
* @param url URL of page to load, or search term used if searchEngine is given
*/
public void loadUrl(String url) {
loadUrl(url, LOADURL_NONE);
}
/**
* Loads a tab with the given URL.
*
* @param url URL of page to load, or search term used if searchEngine is given
* @param flags flags used to load tab
*
* @return the Tab if a new one was created; null otherwise
*/
public Tab loadUrl(String url, int flags) {
return loadUrl(url, null, -1, flags);
}
/**
* Loads a tab with the given URL.
*
* @param url URL of page to load, or search term used if searchEngine is given
* @param searchEngine if given, the search engine with this name is used
* to search for the url string; if null, the URL is loaded directly
* @param parentId ID of this tab's parent, or -1 if it has no parent
* @param flags flags used to load tab
*
* @return the Tab if a new one was created; null otherwise
*/
public Tab loadUrl(String url, String searchEngine, int parentId, int flags) {
JSONObject args = new JSONObject();
Tab added = null;
boolean delayLoad = (flags & LOADURL_DELAY_LOAD) != 0;
// delayLoad implies background tab
boolean background = delayLoad || (flags & LOADURL_BACKGROUND) != 0;
try {
boolean isPrivate = (flags & LOADURL_PRIVATE) != 0;
boolean userEntered = (flags & LOADURL_USER_ENTERED) != 0;
boolean desktopMode = (flags & LOADURL_DESKTOP) != 0;
args.put("url", url);
args.put("engine", searchEngine);
args.put("parentId", parentId);
args.put("userEntered", userEntered);
args.put("newTab", (flags & LOADURL_NEW_TAB) != 0);
args.put("isPrivate", isPrivate);
args.put("pinned", (flags & LOADURL_PINNED) != 0);
args.put("delayLoad", delayLoad);
args.put("desktopMode", desktopMode);
args.put("selected", !background);
if ((flags & LOADURL_NEW_TAB) != 0) {
int tabId = getNextTabId();
args.put("tabID", tabId);
// The URL is updated for the tab once Gecko responds with the
// Tab:Added message. We can preliminarily set the tab's URL as
// long as it's a valid URI.
String tabUrl = (url != null && Uri.parse(url).getScheme() != null) ? url : null;
added = addTab(tabId, tabUrl, false, parentId, url, isPrivate);
added.setDesktopMode(desktopMode);
}
} catch (Exception e) {
Log.w(LOGTAG, "Error building JSON arguments for loadUrl.", e);
}
GeckoAppShell.sendEventToGecko(GeckoEvent.createBroadcastEvent("Tab:Load", args.toString()));
if ((added != null) && !delayLoad && !background) {
selectTab(added.getId());
}
return added;
}
/**
* Open the url as a new tab, and mark the selected tab as its "parent".
*
* If the url is already open in a tab, the existing tab is selected.
* Use this for tabs opened by the browser chrome, so users can press the
* "Back" button to return to the previous tab.
*
* @param url URL of page to load
*/
public void loadUrlInTab(String url) {
Iterable<Tab> tabs = getTabsInOrder();
for (Tab tab : tabs) {
if (url.equals(tab.getURL())) {
selectTab(tab.getId());
return;
}
}
// getSelectedTab() can return null if no tab has been created yet
// (i.e., we're restoring a session after a crash). In these cases,
// don't mark any tabs as a parent.
int parentId = -1;
Tab selectedTab = getSelectedTab();
if (selectedTab != null) {
parentId = selectedTab.getId();
}
loadUrl(url, null, parentId, LOADURL_NEW_TAB);
}
/**
* Gets the next tab ID.
*
* This method is invoked via JNI.
*/
public static int getNextTabId() {
return sTabId.getAndIncrement();
}
}