Web+: implement a simple session management system.

When quitting the app or closing the last window, all windows and tabs
are stored in a "Session" file. This is reloaded when the browser
starts, allowing to restore all windows and tabs.

Limitations: the page content and navigation history are not saved. The
file is written only at exit so this can't be used for crash recovery
(but you can make a backup of your default session).

Fixes #6680.

src/apps/webpositive/BrowserApp.cpp

@@ -77,6 +77,7 @@ BrowserApp::BrowserApp()
 	fInitialized(false),
 	fSettings(NULL),
 	fCookies(NULL),
+	fSession(NULL),
 	fContext(NULL),
 	fDownloadWindow(NULL),
 	fSettingsWindow(NULL),
@@ -92,6 +93,11 @@ BrowserApp::BrowserApp()
 	fContext = new BUrlContext();
 	fContext->SetCookieJar(BNetworkCookieJar(&cookieArchive));
 #endif
+
+	BString sessionStorePath = kApplicationName;
+	sessionStorePath << "/Session";
+	fSession = new SettingsMessage(B_USER_SETTINGS_DIRECTORY,
+		sessionStorePath.String());
 }
 
 
@@ -100,6 +106,7 @@ BrowserApp::~BrowserApp()
 	delete fLaunchRefsMessage;
 	delete fSettings;
 	delete fCookies;
+	delete fSession;
 	delete fContext;
 }
 
@@ -223,6 +230,29 @@ BrowserApp::ReadyToRun()
 		delete fLaunchRefsMessage;
 		fLaunchRefsMessage = NULL;
 	}
+
+	BMessage archivedWindow;
+	for (int i = 0; fSession->FindMessage("window", i, &archivedWindow) == B_OK;
+		i++) {
+
+		BRect frame = archivedWindow.FindRect("window frame");
+		BString url;
+		archivedWindow.FindString("tab", 0, &url);
+		BrowserWindow* window = new(std::nothrow) BrowserWindow(frame,
+			fSettings, url, fContext);
+
+		if (window != NULL) {
+			window->Show();
+
+			for (int j = 1; archivedWindow.FindString("tab", j, &url) == B_OK;
+				j++) {
+				printf("Create %d:%d\n", i, j);
+				_CreateNewTab(window, url, false);
+				pagesCreated++;
+			}
+		}
+	}
+
 	if (pagesCreated == 0)
 		_CreateNewWindow("", fullscreen);
 
@@ -267,8 +297,11 @@ BrowserApp::MessageReceived(BMessage* message)
 	case WINDOW_CLOSED:
 		fWindowCount--;
 		message->FindRect("window frame", &fLastWindowFrame);
-		if (fWindowCount <= 0)
-			PostMessage(B_QUIT_REQUESTED);
+		if (fWindowCount <= 0) {
+			BMessage* message = new BMessage(B_QUIT_REQUESTED);
+			message->AddMessage("window", DetachCurrentMessage());
+			PostMessage(message);
+		}
 		break;
 
 	case SHOW_DOWNLOAD_WINDOW:
@@ -333,19 +366,36 @@ BrowserApp::QuitRequested()
 		}
 	}
 
-	for (int i = 0; BWindow* window = WindowAt(i); i++) {
-		BrowserWindow* webWindow = dynamic_cast<BrowserWindow*>(window);
-		if (!webWindow)
-			continue;
-		if (!webWindow->Lock())
-			continue;
-		if (webWindow->QuitRequested()) {
-			fLastWindowFrame = webWindow->WindowFrame();
-			webWindow->Quit();
-			i--;
-		} else {
-			webWindow->Unlock();
-			return false;
+	fSession->MakeEmpty();
+
+	/* See if we got here because the last window is already closed.
+	 * In that case we only need to save that one, which is already archived */
+	BMessage* message = CurrentMessage();
+	BMessage windowMessage;
+	
+	status_t ret = message->FindMessage("window", &windowMessage);
+	if (ret == B_OK) {
+		fSession->AddMessage("window", &windowMessage);
+	} else {
+		for (int i = 0; BWindow* window = WindowAt(i); i++) {
+			BrowserWindow* webWindow = dynamic_cast<BrowserWindow*>(window);
+			if (!webWindow)
+				continue;
+			if (!webWindow->Lock())
+				continue;
+
+			BMessage windowArchive;
+			webWindow->Archive(&windowArchive, true);
+			fSession->AddMessage("window", &windowArchive);
+
+			if (webWindow->QuitRequested()) {
+				fLastWindowFrame = webWindow->WindowFrame();
+				webWindow->Quit();
+				i--;
+			} else {
+				webWindow->Unlock();
+				return false;
+			}
 		}
 	}
 

src/apps/webpositive/BrowserApp.h

@@ -79,6 +79,7 @@ private:
 
 			SettingsMessage*	fSettings;
 			SettingsMessage*	fCookies;
+			SettingsMessage*	fSession;
 			BUrlContext*		fContext;
 
 			DownloadWindow*		fDownloadWindow;

src/apps/webpositive/BrowserWindow.cpp

@@ -1186,18 +1186,39 @@ BrowserWindow::MessageReceived(BMessage* message)
 }
 
 
+status_t
+BrowserWindow::Archive(BMessage* archive, bool deep) const
+{
+	status_t ret = archive->AddRect("window frame", Frame());
+
+	for (int i = 0; i < fTabManager->CountTabs(); i++) {
+		BWebView* view = dynamic_cast<BWebView*>(fTabManager->ViewForTab(i));
+		if (view == NULL) {
+			continue;
+		}
+
+		if (ret == B_OK)
+			ret = archive->AddString("tab", view->MainFrameURL());
+	}
+
+	return ret;
+}
+
+
 bool
 BrowserWindow::QuitRequested()
 {
 	// TODO: Check for modified form data and ask user for confirmation, etc.
 
+	BMessage message(WINDOW_CLOSED);
+	Archive(&message);
+
 	// Iterate over all tabs to delete all BWebViews.
 	// Do this here, so WebKit tear down happens earlier.
 	SetCurrentWebView(NULL);
 	while (fTabManager->CountTabs() > 0)
 		_ShutdownTab(0);
 
-	BMessage message(WINDOW_CLOSED);
 	message.AddRect("window frame", WindowFrame());
 	be_app->PostMessage(&message);
 	return true;

src/apps/webpositive/BrowserWindow.h

@@ -104,6 +104,7 @@ public:
 	virtual	void				DispatchMessage(BMessage* message,
 									BHandler* target);
 	virtual	void				MessageReceived(BMessage* message);
+	virtual	status_t			Archive(BMessage* archive, bool deep =true) const;
 	virtual	bool				QuitRequested();
 	virtual	void				MenusBeginning();
 	virtual	void				MenusEnded();