/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.browser;
import android.content.Context;
import android.net.http.SslError;
import android.os.Bundle;
import android.os.Message;
import android.util.Config;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.webkit.HttpAuthHandler;
import android.webkit.JsPromptResult;
import android.webkit.JsResult;
import android.webkit.SslErrorHandler;
import android.webkit.WebBackForwardList;
import android.webkit.WebChromeClient;
import android.webkit.WebHistoryItem;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.FrameLayout;
import android.widget.ImageButton;
import java.io.File;
import java.util.ArrayList;
import java.util.Vector;
class TabControl {
// Log Tag
private static final String LOGTAG = "TabControl";
// Maximum number of tabs.
static final int MAX_TABS = 8;
// Static instance of an empty callback.
private static final WebViewClient mEmptyClient =
new WebViewClient();
// Instance of BackgroundChromeClient for background tabs.
private final BackgroundChromeClient mBackgroundChromeClient =
new BackgroundChromeClient();
// Private array of WebViews that are used as tabs.
private ArrayList<Tab> mTabs = new ArrayList<Tab>(MAX_TABS);
// Queue of most recently viewed tabs.
private ArrayList<Tab> mTabQueue = new ArrayList<Tab>(MAX_TABS);
// Current position in mTabs.
private int mCurrentTab = -1;
// A private instance of BrowserActivity to interface with when adding and
// switching between tabs.
private final BrowserActivity mActivity;
// Inflation service for making subwindows.
private final LayoutInflater mInflateService;
// Subclass of WebViewClient used in subwindows to notify the main
// WebViewClient of certain WebView activities.
private class SubWindowClient extends WebViewClient {
// The main WebViewClient.
private final WebViewClient mClient;
SubWindowClient(WebViewClient client) {
mClient = client;
}
@Override
public void doUpdateVisitedHistory(WebView view, String url,
boolean isReload) {
mClient.doUpdateVisitedHistory(view, url, isReload);
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
return mClient.shouldOverrideUrlLoading(view, url);
}
@Override
public void onReceivedSslError(WebView view, SslErrorHandler handler,
SslError error) {
mClient.onReceivedSslError(view, handler, error);
}
@Override
public void onReceivedHttpAuthRequest(WebView view,
HttpAuthHandler handler, String host, String realm) {
mClient.onReceivedHttpAuthRequest(view, handler, host, realm);
}
@Override
public void onFormResubmission(WebView view, Message dontResend,
Message resend) {
mClient.onFormResubmission(view, dontResend, resend);
}
@Override
public void onReceivedError(WebView view, int errorCode,
String description, String failingUrl) {
mClient.onReceivedError(view, errorCode, description, failingUrl);
}
}
// Subclass of WebChromeClient to display javascript dialogs.
private class SubWindowChromeClient extends WebChromeClient {
// This subwindow's tab.
private final Tab mTab;
// The main WebChromeClient.
private final WebChromeClient mClient;
SubWindowChromeClient(Tab t, WebChromeClient client) {
mTab = t;
mClient = client;
}
@Override
public void onProgressChanged(WebView view, int newProgress) {
mClient.onProgressChanged(view, newProgress);
}
@Override
public boolean onCreateWindow(WebView view, boolean dialog,
boolean userGesture, android.os.Message resultMsg) {
return mClient.onCreateWindow(view, dialog, userGesture, resultMsg);
}
@Override
public void onCloseWindow(WebView window) {
if (Config.DEBUG && window != mTab.mSubView) {
throw new AssertionError("Can't close the window");
}
mActivity.dismissSubWindow(mTab);
}
}
// Background WebChromeClient for focusing tabs
private class BackgroundChromeClient extends WebChromeClient {
@Override
public void onRequestFocus(WebView view) {
Tab t = getTabFromView(view);
if (t != getCurrentTab()) {
mActivity.showTab(t);
}
}
}
/**
* Private class for maintaining Tabs with a main WebView and a subwindow.
*/
public class Tab {
// Main WebView
private WebView mMainView;
// Subwindow WebView
private WebView mSubView;
// Subwindow container
private View mSubViewContainer;
// Subwindow callback
private SubWindowClient mSubViewClient;
// Subwindow chrome callback
private SubWindowChromeClient mSubViewChromeClient;
// Saved bundle for when we are running low on memory. It contains the
// information needed to restore the WebView if the user goes back to
// the tab.
private Bundle mSavedState;
// Extra saved information for displaying the tab in the picker.
private String mUrl;
private String mTitle;
// Parent Tab. This is the Tab that created this Tab, or null
// if the Tab was created by the UI
private Tab mParentTab;
// Tab that constructed by this Tab. This is used when this
// Tab is destroyed, it clears all mParentTab values in the
// children.
private Vector<Tab> mChildTabs;
private Boolean mCloseOnExit;
// Application identifier used to find tabs that another application
// wants to reuse.
private String mAppId;
// Keep the original url around to avoid killing the old WebView if the
// url has not changed.
private String mOriginalUrl;
// Construct a new tab
private Tab(WebView w, boolean closeOnExit, String appId, String url) {
mMainView = w;
mCloseOnExit = closeOnExit;
mAppId = appId;
mOriginalUrl = url;
}
/**
* Return the top window of this tab; either the subwindow if it is not
* null or the main window.
* @return The top window of this tab.
*/
public WebView getTopWindow() {
if (mSubView != null) {
return mSubView;
}
return mMainView;
}
/**
* Return the main window of this tab. Note: if a tab is freed in the
* background, this can return null. It is only guaranteed to be
* non-null for the current tab.
* @return The main WebView of this tab.
*/
public WebView getWebView() {
return mMainView;
}
/**
* Return the subwindow of this tab or null if there is no subwindow.
* @return The subwindow of this tab or null.
*/
public WebView getSubWebView() {
return mSubView;
}
/**
* Return the subwindow container of this tab or null if there is no
* subwindow.
* @return The subwindow's container View.
*/
public View getSubWebViewContainer() {
return mSubViewContainer;
}
/**
* Get the url of this tab. Valid after calling populatePickerData, but
* before calling wipePickerData, or if the webview has been destroyed.
*
* @return The WebView's url or null.
*/
public String getUrl() {
return mUrl;
}
/**
* Get the title of this tab. Valid after calling populatePickerData,
* but before calling wipePickerData, or if the webview has been
* destroyed. If the url has no title, use the url instead.
*
* @return The WebView's title (or url) or null.
*/
public String getTitle() {
return mTitle;
}
private void setParentTab(Tab parent) {
mParentTab = parent;
// This tab may have been freed due to low memory. If that is the
// case, the parent tab index is already saved. If we are changing
// that index (most likely due to removing the parent tab) we must
// update the parent tab index in the saved Bundle.
if (mSavedState != null) {
if (parent == null) {
mSavedState.remove(PARENTTAB);
} else {
mSavedState.putInt(PARENTTAB, getTabIndex(parent));
}
}
}
/**
* When a Tab is created through the content of another Tab, then
* we associate the Tabs.
* @param child the Tab that was created from this Tab
*/
public void addChildTab(Tab child) {
if (mChildTabs == null) {
mChildTabs = new Vector<Tab>();
}
mChildTabs.add(child);
child.setParentTab(this);
}
private void removeFromTree() {
// detach the children
if (mChildTabs != null) {
for(Tab t : mChildTabs) {
t.setParentTab(null);
}
}
// Find myself in my parent list
if (mParentTab != null) {
mParentTab.mChildTabs.remove(this);
}
}
/**
* If this Tab was created through another Tab, then this method
* returns that Tab.
* @return the Tab parent or null
*/
public Tab getParentTab() {
return mParentTab;
}
/**
* Return whether this tab should be closed when it is backing out of
* the first page.
* @return TRUE if this tab should be closed when exit.
*/
public boolean closeOnExit() {
return mCloseOnExit;
}
};
// Directory to store thumbnails for each WebView.
private final File mThumbnailDir;
/**
* Construct a new TabControl object that interfaces with the given
* BrowserActivity instance.
* @param activity A BrowserActivity instance that TabControl will interface
* with.
*/
TabControl(BrowserActivity activity) {
mActivity = activity;
mInflateService =
((LayoutInflater) activity.getSystemService(
Context.LAYOUT_INFLATER_SERVICE));
mThumbnailDir = activity.getDir("thumbnails", 0);
}
File getThumbnailDir() {
return mThumbnailDir;
}
BrowserActivity getBrowserActivity() {
return mActivity;
}
/**
* Return the current tab's main WebView. This will always return the main
* WebView for a given tab and not a subwindow.
* @return The current tab's WebView.
*/
WebView getCurrentWebView() {
Tab t = getTab(mCurrentTab);
if (t == null) {
return null;
}
return t.mMainView;
}
/**
* Return the current tab's top-level WebView. This can return a subwindow
* if one exists.
* @return The top-level WebView of the current tab.
*/
WebView getCurrentTopWebView() {
Tab t = getTab(mCurrentTab);
if (t == null) {
return null;
}
return t.mSubView != null ? t.mSubView : t.mMainView;
}
/**
* Return the current tab's subwindow if it exists.
* @return The subwindow of the current tab or null if it doesn't exist.
*/
WebView getCurrentSubWindow() {
Tab t = getTab(mCurrentTab);
if (t == null) {
return null;
}
return t.mSubView;
}
/**
* Return the tab at the specified index.
* @return The Tab for the specified index or null if the tab does not
* exist.
*/
Tab getTab(int index) {
if (index >= 0 && index < mTabs.size()) {
return mTabs.get(index);
}
return null;
}
/**
* Return the current tab.
* @return The current tab.
*/
Tab getCurrentTab() {
return getTab(mCurrentTab);
}
/**
* Return the current tab index.
* @return The current tab index
*/
int getCurrentIndex() {
return mCurrentTab;
}
/**
* Given a Tab, find it's index
* @param Tab to find
* @return index of Tab or -1 if not found
*/
int getTabIndex(Tab tab) {
return mTabs.indexOf(tab);
}
/**
* Create a new tab.
* @return The newly createTab or null if we have reached the maximum
* number of open tabs.
*/
Tab createNewTab(boolean closeOnExit, String appId, String url) {
int size = mTabs.size();
// Return false if we have maxed out on tabs
if (MAX_TABS == size) {
return null;
}
final WebView w = createNewWebView();
// Create a new tab and add it to the tab list
Tab t = new Tab(w, closeOnExit, appId, url);
mTabs.add(t);
// Initially put the tab in the background.
putTabInBackground(t);
return t;
}
/**
* Create a new tab with default values for closeOnExit(false),
* appId(null), and url(null).
*/
Tab createNewTab() {
return createNewTab(false, null, null);
}
/**
* Remove the tab from the list. If the tab is the current tab shown, the
* last created tab will be shown.
* @param t The tab to be removed.
*/
boolean removeTab(Tab t) {
if (t == null) {
return false;
}
// Only remove the tab if it is the current one.
if (getCurrentTab() == t) {
putTabInBackground(t);
}
// Only destroy the WebView if it still exists.
if (t.mMainView != null) {
// Take down the sub window.
dismissSubWindow(t);
// Remove the WebView's settings from the BrowserSettings list of
// observers.
BrowserSettings.getInstance().deleteObserver(
t.mMainView.getSettings());
// Destroy the main view and subview
t.mMainView.destroy();
t.mMainView = null;
}
// clear it's references to parent and children
t.removeFromTree();
// Remove it from our list of tabs.
mTabs.remove(t);
// The tab indices have shifted, update all the saved state so we point
// to the correct index.
for (Tab tab : mTabs) {
if (tab.mChildTabs != null) {
for (Tab child : tab.mChildTabs) {
child.setParentTab(tab);
}
}
}
// This tab may have been pushed in to the background and then closed.
// If the saved state contains a picture file, delete the file.
if (t.mSavedState != null) {
if (t.mSavedState.containsKey("picture")) {
new File(t.mSavedState.getString("picture")).delete();
}
}
// Remove it from the queue of viewed tabs.
mTabQueue.remove(t);
mCurrentTab = -1;
return true;
}
/**
* Clear the back/forward list for all the current tabs.
*/
void clearHistory() {
int size = getTabCount();
for (int i = 0; i < size; i++) {
Tab t = mTabs.get(i);
// TODO: if a tab is freed due to low memory, its history is not
// cleared here.
if (t.mMainView != null) {
t.mMainView.clearHistory();
}
if (t.mSubView != null) {
t.mSubView.clearHistory();
}
}
}
/**
* Destroy all the tabs and subwindows
*/
void destroy() {
BrowserSettings s = BrowserSettings.getInstance();
for (Tab t : mTabs) {
if (t.mMainView != null) {
dismissSubWindow(t);
s.deleteObserver(t.mMainView.getSettings());
t.mMainView.destroy();
t.mMainView = null;
}
}
mTabs.clear();
mTabQueue.clear();
}
/**
* Returns the number of tabs created.
* @return The number of tabs created.
*/
int getTabCount() {
return mTabs.size();
}
// Used for saving and restoring each Tab
private static final String WEBVIEW = "webview";
private static final String NUMTABS = "numTabs";
private static final String CURRTAB = "currentTab";
private static final String CURRURL = "currentUrl";
private static final String CURRTITLE = "currentTitle";
private static final String CLOSEONEXIT = "closeonexit";
private static final String PARENTTAB = "parentTab";
private static final String APPID = "appid";
private static final String ORIGINALURL = "originalUrl";
/**
* Save the state of all the Tabs.
* @param outState The Bundle to save the state to.
*/
void saveState(Bundle outState) {
final int numTabs = getTabCount();
outState.putInt(NUMTABS, numTabs);
final int index = getCurrentIndex();
outState.putInt(CURRTAB, (index >= 0 && index < numTabs) ? index : 0);
for (int i = 0; i < numTabs; i++) {
final Tab t = getTab(i);
if (saveState(t)) {
outState.putBundle(WEBVIEW + i, t.mSavedState);
}
}
}
/**
* Restore the state of all the tabs.
* @param inState The saved state of all the tabs.
* @return True if there were previous tabs that were restored. False if
* there was no saved state or restoring the state failed.
*/
boolean restoreState(Bundle inState) {
final int numTabs = (inState == null)
? -1 : inState.getInt(NUMTABS, -1);
if (numTabs == -1) {
return false;
} else {
final int currentTab = inState.getInt(CURRTAB, -1);
for (int i = 0; i < numTabs; i++) {
if (i == currentTab) {
Tab t = createNewTab();
// Me must set the current tab before restoring the state
// so that all the client classes are set.
setCurrentTab(t);
if (!restoreState(inState.getBundle(WEBVIEW + i), t)) {
Log.w(LOGTAG, "Fail in restoreState, load home page.");
t.mMainView.loadUrl(BrowserSettings.getInstance()
.getHomePage());
}
} else {
// Create a new tab and don't restore the state yet, add it
// to the tab list
Tab t = new Tab(null, false, null, null);
t.mSavedState = inState.getBundle(WEBVIEW + i);
if (t.mSavedState != null) {
t.mUrl = t.mSavedState.getString(CURRURL);
t.mTitle = t.mSavedState.getString(CURRTITLE);
// Need to maintain the app id and original url so we
// can possibly reuse this tab.
t.mAppId = t.mSavedState.getString(APPID);
t.mOriginalUrl = t.mSavedState.getString(ORIGINALURL);
}
mTabs.add(t);
mTabQueue.add(t);
}
}
// Rebuild the tree of tabs. Do this after all tabs have been
// created/restored so that the parent tab exists.
for (int i = 0; i < numTabs; i++) {
final Bundle b = inState.getBundle(WEBVIEW + i);
final Tab t = getTab(i);
if (b != null && t != null) {
final int parentIndex = b.getInt(PARENTTAB, -1);
if (parentIndex != -1) {
final Tab parent = getTab(parentIndex);
if (parent != null) {
parent.addChildTab(t);
}
}
}
}
}
return true;
}
/**
* Free the memory in this order, 1) free the background tab; 2) free the
* WebView cache;
*/
void freeMemory() {
// free the least frequently used background tab
Tab t = getLeastUsedTab();
if (t != null) {
Log.w(LOGTAG, "Free a tab in the browser");
freeTab(t);
// force a gc
System.gc();
return;
}
// free the WebView cache
Log.w(LOGTAG, "Free WebView cache");
WebView view = getCurrentWebView();
if (view != null) {
view.clearCache(false);
}
// force a gc
System.gc();
}
private Tab getLeastUsedTab() {
// Don't do anything if we only have 1 tab.
if (getTabCount() == 1) {
return null;
}
// Rip through the queue starting at the beginning and teardown the
// next available tab.
Tab t = null;
int i = 0;
final int queueSize = mTabQueue.size();
if (queueSize == 0) {
return null;
}
do {
t = mTabQueue.get(i++);
} while (i < queueSize && t != null && t.mMainView == null);
// Don't do anything if the last remaining tab is the current one.
if (t == getCurrentTab()) {
return null;
}
return t;
}
private void freeTab(Tab t) {
// Store the WebView's state.
saveState(t);
// Tear down the tab.
dismissSubWindow(t);
// Remove the WebView's settings from the BrowserSettings list of
// observers.
BrowserSettings.getInstance().deleteObserver(t.mMainView.getSettings());
t.mMainView.destroy();
t.mMainView = null;
}
/**
* Create a new subwindow unless a subwindow already exists.
* @return True if a new subwindow was created. False if one already exists.
*/
void createSubWindow() {
Tab t = getTab(mCurrentTab);
if (t != null && t.mSubView == null) {
final View v = mInflateService.inflate(R.layout.browser_subwindow, null);
final WebView w = (WebView) v.findViewById(R.id.webview);
w.setMapTrackballToArrowKeys(false); // use trackball directly
final SubWindowClient subClient =
new SubWindowClient(mActivity.getWebViewClient());
final SubWindowChromeClient subChromeClient =
new SubWindowChromeClient(t,
mActivity.getWebChromeClient());
w.setWebViewClient(subClient);
w.setWebChromeClient(subChromeClient);
w.setDownloadListener(mActivity);
w.setOnCreateContextMenuListener(mActivity);
final BrowserSettings s = BrowserSettings.getInstance();
s.addObserver(w.getSettings()).update(s, null);
t.mSubView = w;
t.mSubViewClient = subClient;
t.mSubViewChromeClient = subChromeClient;
// FIXME: I really hate having to know the name of the view
// containing the webview.
t.mSubViewContainer = v.findViewById(R.id.subwindow_container);
final ImageButton cancel =
(ImageButton) v.findViewById(R.id.subwindow_close);
cancel.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
subChromeClient.onCloseWindow(w);
}
});
}
}
/**
* Show the tab that contains the given WebView.
* @param view The WebView used to find the tab.
*/
Tab getTabFromView(WebView view) {
final int size = getTabCount();
for (int i = 0; i < size; i++) {
final Tab t = getTab(i);
if (t.mSubView == view || t.mMainView == view) {
return t;
}
}
return null;
}
/**
* Return the tab with the matching application id.
* @param id The application identifier.
*/
Tab getTabFromId(String id) {
if (id == null) {
return null;
}
final int size = getTabCount();
for (int i = 0; i < size; i++) {
final Tab t = getTab(i);
if (id.equals(t.mAppId)) {
return t;
}
}
return null;
}
/**
* Recreate the main WebView of the given tab. Returns true if the WebView
* was deleted.
*/
boolean recreateWebView(Tab t, String url) {
final WebView w = t.mMainView;
if (w != null) {
if (url != null && url.equals(t.mOriginalUrl)) {
// The original url matches the current url. Just go back to the
// first history item so we can load it faster than if we
// rebuilt the WebView.
final WebBackForwardList list = w.copyBackForwardList();
if (list != null) {
w.goBackOrForward(-list.getCurrentIndex());
w.clearHistory(); // maintains the current page.
return false;
}
}
// Remove the settings object from the global settings and destroy
// the WebView.
BrowserSettings.getInstance().deleteObserver(
t.mMainView.getSettings());
t.mMainView.destroy();
}
// Create a new WebView. If this tab is the current tab, we need to put
// back all the clients so force it to be the current tab.
t.mMainView = createNewWebView();
if (getCurrentTab() == t) {
setCurrentTab(t, true);
}
// Clear the saved state except for the app id and close-on-exit
// values.
t.mSavedState = null;
t.mUrl = null;
t.mTitle = null;
// Save the new url in order to avoid deleting the WebView.
t.mOriginalUrl = url;
return true;
}
/**
* Creates a new WebView and registers it with the global settings.
*/
private WebView createNewWebView() {
// Create a new WebView
WebView w = new WebView(mActivity);
w.setMapTrackballToArrowKeys(false); // use trackball directly
// Enable the built-in zoom
w.getSettings().setBuiltInZoomControls(true);
// Add this WebView to the settings observer list and update the
// settings
final BrowserSettings s = BrowserSettings.getInstance();
s.addObserver(w.getSettings()).update(s, null);
return w;
}
/**
* Put the current tab in the background and set newTab as the current tab.
* @param newTab The new tab. If newTab is null, the current tab is not
* set.
*/
boolean setCurrentTab(Tab newTab) {
return setCurrentTab(newTab, false);
}
/**
* If force is true, this method skips the check for newTab == current.
*/
private boolean setCurrentTab(Tab newTab, boolean force) {
Tab current = getTab(mCurrentTab);
if (current == newTab && !force) {
return true;
}
if (current != null) {
// Remove the current WebView and the container of the subwindow
putTabInBackground(current);
}
if (newTab == null) {
return false;
}
// Move the newTab to the end of the queue
int index = mTabQueue.indexOf(newTab);
if (index != -1) {
mTabQueue.remove(index);
}
mTabQueue.add(newTab);
WebView mainView;
WebView subView;
// Display the new current tab
mCurrentTab = mTabs.indexOf(newTab);
mainView = newTab.mMainView;
boolean needRestore = (mainView == null);
if (needRestore) {
// Same work as in createNewTab() except don't do new Tab()
newTab.mMainView = mainView = createNewWebView();
}
mainView.setWebViewClient(mActivity.getWebViewClient());
mainView.setWebChromeClient(mActivity.getWebChromeClient());
mainView.setOnCreateContextMenuListener(mActivity);
mainView.setDownloadListener(mActivity);
// Add the subwindow if it exists
if (newTab.mSubViewContainer != null) {
subView = newTab.mSubView;
subView.setWebViewClient(newTab.mSubViewClient);
subView.setWebChromeClient(newTab.mSubViewChromeClient);
subView.setOnCreateContextMenuListener(mActivity);
subView.setDownloadListener(mActivity);
}
if (needRestore) {
// Have to finish setCurrentTab work before calling restoreState
if (!restoreState(newTab.mSavedState, newTab)) {
mainView.loadUrl(BrowserSettings.getInstance().getHomePage());
}
}
return true;
}
/*
* Put the tab in the background using all the empty/background clients.
*/
private void putTabInBackground(Tab t) {
WebView mainView = t.mMainView;
// Set an empty callback so that default actions are not triggered.
mainView.setWebViewClient(mEmptyClient);
mainView.setWebChromeClient(mBackgroundChromeClient);
mainView.setOnCreateContextMenuListener(null);
// Leave the DownloadManager attached so that downloads can start in
// a non-active window. This can happen when going to a site that does
// a redirect after a period of time. The user could have switched to
// another tab while waiting for the download to start.
mainView.setDownloadListener(mActivity);
WebView subView = t.mSubView;
if (subView != null) {
// Set an empty callback so that default actions are not triggered.
subView.setWebViewClient(mEmptyClient);
subView.setWebChromeClient(mBackgroundChromeClient);
subView.setOnCreateContextMenuListener(null);
subView.setDownloadListener(mActivity);
}
}
/*
* Dismiss the subwindow for the given tab.
*/
void dismissSubWindow(Tab t) {
if (t != null && t.mSubView != null) {
BrowserSettings.getInstance().deleteObserver(
t.mSubView.getSettings());
t.mSubView.destroy();
t.mSubView = null;
t.mSubViewContainer = null;
}
}
/**
* Ensure that Tab t has a title, url, and favicon.
* @param t Tab to populate.
*/
/* package */ void populatePickerData(Tab t) {
if (t == null || t.mMainView == null) {
return;
}
// FIXME: The only place we cared about subwindow was for
// bookmarking (i.e. not when saving state). Was this deliberate?
final WebBackForwardList list = t.mMainView.copyBackForwardList();
final WebHistoryItem item =
list != null ? list.getCurrentItem() : null;
populatePickerData(t, item);
}
// Populate the picker data
private void populatePickerData(Tab t, WebHistoryItem item) {
if (item != null) {
t.mUrl = item.getUrl();
t.mTitle = item.getTitle();
if (t.mTitle == null) {
t.mTitle = t.mUrl;
}
}
}
/**
* Clean up the data for all tabs.
*/
/* package */ void wipeAllPickerData() {
int size = getTabCount();
for (int i = 0; i < size; i++) {
final Tab t = getTab(i);
if (t != null && t.mSavedState == null) {
t.mUrl = null;
t.mTitle = null;
}
}
}
/*
* Save the state for an individual tab.
*/
private boolean saveState(Tab t) {
if (t != null) {
final WebView w = t.mMainView;
// If the WebView is null it means we ran low on memory and we
// already stored the saved state in mSavedState.
if (w == null) {
return true;
}
final Bundle b = new Bundle();
final WebBackForwardList list = w.saveState(b);
if (list != null) {
final File f = new File(mThumbnailDir, w.hashCode()
+ "_pic.save");
if (w.savePicture(b, f)) {
b.putString("picture", f.getPath());
}
}
// Store some extra info for displaying the tab in the picker.
final WebHistoryItem item =
list != null ? list.getCurrentItem() : null;
populatePickerData(t, item);
if (t.mUrl != null) {
b.putString(CURRURL, t.mUrl);
}
if (t.mTitle != null) {
b.putString(CURRTITLE, t.mTitle);
}
b.putBoolean(CLOSEONEXIT, t.mCloseOnExit);
if (t.mAppId != null) {
b.putString(APPID, t.mAppId);
}
if (t.mOriginalUrl != null) {
b.putString(ORIGINALURL, t.mOriginalUrl);
}
// Remember the parent tab so the relationship can be restored.
if (t.mParentTab != null) {
b.putInt(PARENTTAB, getTabIndex(t.mParentTab));
}
// Remember the saved state.
t.mSavedState = b;
return true;
}
return false;
}
/*
* Restore the state of the tab.
*/
private boolean restoreState(Bundle b, Tab t) {
if (b == null) {
return false;
}
// Restore the internal state even if the WebView fails to restore.
// This will maintain the app id, original url and close-on-exit values.
t.mSavedState = null;
t.mUrl = null;
t.mTitle = null;
t.mCloseOnExit = b.getBoolean(CLOSEONEXIT);
t.mAppId = b.getString(APPID);
t.mOriginalUrl = b.getString(ORIGINALURL);
final WebView w = t.mMainView;
final WebBackForwardList list = w.restoreState(b);
if (list == null) {
return false;
}
if (b.containsKey("picture")) {
final File f = new File(b.getString("picture"));
w.restorePicture(b, f);
f.delete();
}
return true;
}
}