Add robustness against null models

src/qt/aboutdialog.cpp

@@ -12,7 +12,10 @@ AboutDialog::AboutDialog(QWidget *parent) :
 
 void AboutDialog::setModel(ClientModel *model)
 {
+    if(model)
+    {
         ui->versionLabel->setText(model->formatFullVersion());
+    }
 }
 
 AboutDialog::~AboutDialog()

src/qt/addressbookpage.cpp

@@ -57,6 +57,8 @@ AddressBookPage::~AddressBookPage()
 void AddressBookPage::setModel(AddressTableModel *model)
 {
     this->model = model;
+    if(!model)
+        return;
     // Refresh list from core
     model->updateList();
 
@@ -96,16 +98,13 @@ void AddressBookPage::setModel(AddressTableModel *model)
     selectionChanged();
 }
 
-QTableView *AddressBookPage::getCurrentTable()
-{
-    return ui->tableView;
-}
-
 void AddressBookPage::on_copyToClipboard_clicked()
 {
     // Copy currently selected address to clipboard
     //   (or nothing, if nothing selected)
-    QTableView *table = getCurrentTable();
+    QTableView *table = ui->tableView;
+    if(!table->selectionModel())
+        return;
     QModelIndexList indexes = table->selectionModel()->selectedRows(AddressTableModel::Address);
 
     foreach (QModelIndex index, indexes)
@@ -117,6 +116,8 @@ void AddressBookPage::on_copyToClipboard_clicked()
 
 void AddressBookPage::on_newAddressButton_clicked()
 {
+    if(!model)
+        return;
     EditAddressDialog dlg(
             tab == SendingTab ?
             EditAddressDialog::NewSendingAddress :
@@ -139,7 +140,9 @@ void AddressBookPage::on_newAddressButton_clicked()
 
 void AddressBookPage::on_deleteButton_clicked()
 {
-    QTableView *table = getCurrentTable();
+    QTableView *table = ui->tableView;
+    if(!table->selectionModel())
+        return;
     QModelIndexList indexes = table->selectionModel()->selectedRows();
     if(!indexes.isEmpty())
     {
@@ -150,7 +153,9 @@ void AddressBookPage::on_deleteButton_clicked()
 void AddressBookPage::selectionChanged()
 {
     // Set button states based on selected tab and selection
-    QTableView *table = getCurrentTable();
+    QTableView *table = ui->tableView;
+    if(!table->selectionModel())
+        return;
 
     if(table->selectionModel()->hasSelection())
     {
@@ -174,12 +179,14 @@ void AddressBookPage::selectionChanged()
 
 void AddressBookPage::done(int retval)
 {
+    QTableView *table = ui->tableView;
+    if(!table->selectionModel() || !table->model())
+        return;
     // When this is a tab/widget and not a model dialog, ignore "done"
     if(mode == ForEditing)
         return;
 
     // Figure out which address was selected, and return it
-    QTableView *table = getCurrentTable();
     QModelIndexList indexes = table->selectionModel()->selectedRows(AddressTableModel::Address);
 
     foreach (QModelIndex index, indexes)

src/qt/addressbookpage.h

@@ -47,8 +47,6 @@ private:
     QString returnValue;
     QSortFilterProxyModel *proxyModel;
 
-    QTableView *getCurrentTable();
-
 private slots:
     void on_deleteButton_clicked();
     void on_newAddressButton_clicked();

src/qt/askpassphrasedialog.cpp

@@ -72,6 +72,8 @@ void AskPassphraseDialog::setModel(WalletModel *model)
 void AskPassphraseDialog::accept()
 {
     std::string oldpass, newpass1, newpass2;
+    if(!model)
+        return;
     // TODO: mlock memory / munlock on return so they will not be swapped out, really need "mlockedstring" wrapper class to do this safely
     oldpass.reserve(MAX_PASSPHRASE_SIZE);
     newpass1.reserve(MAX_PASSPHRASE_SIZE);

src/qt/bitcoingui.cpp

@@ -267,7 +267,8 @@ void BitcoinGUI::createToolBars()
 void BitcoinGUI::setClientModel(ClientModel *clientModel)
 {
     this->clientModel = clientModel;
-
+    if(clientModel)
+    {
         if(clientModel->isTestNet())
         {
             QString title_testnet = windowTitle() + QString(" ") + tr("[testnet]");
@@ -293,12 +294,14 @@ void BitcoinGUI::setClientModel(ClientModel *clientModel)
 
         // Report errors from network/worker thread
         connect(clientModel, SIGNAL(error(QString,QString)), this, SLOT(error(QString,QString)));
+    }
 }
 
 void BitcoinGUI::setWalletModel(WalletModel *walletModel)
 {
     this->walletModel = walletModel;
-
+    if(walletModel)
+    {
         // Report errors from wallet thread
         connect(walletModel, SIGNAL(error(QString,QString)), this, SLOT(error(QString,QString)));
 
@@ -319,6 +322,7 @@ void BitcoinGUI::setWalletModel(WalletModel *walletModel)
 
         // Ask for passphrase if needed
         connect(walletModel, SIGNAL(requireUnlock()), this, SLOT(unlockWallet()));
+    }
 }
 
 void BitcoinGUI::createTrayIcon()
@@ -369,6 +373,8 @@ void BitcoinGUI::trayIconActivated(QSystemTrayIcon::ActivationReason reason)
 
 void BitcoinGUI::optionsClicked()
 {
+    if(!clientModel || !clientModel->getOptionsModel())
+        return;
     OptionsDialog dlg;
     dlg.setModel(clientModel->getOptionsModel());
     dlg.exec();
@@ -398,6 +404,8 @@ void BitcoinGUI::setNumConnections(int count)
 
 void BitcoinGUI::setNumBlocks(int count)
 {
+    if(!clientModel)
+        return;
     int initTotal = clientModel->getNumBlocksAtStartup();
     int total = clientModel->getNumBlocksOfPeers();
     QString tooltip;
@@ -492,6 +500,8 @@ void BitcoinGUI::changeEvent(QEvent *e)
 
 void BitcoinGUI::closeEvent(QCloseEvent *event)
 {
+    if(clientModel)
+    {
 #ifndef Q_WS_MAC // Ignored on Mac
         if(!clientModel->getOptionsModel()->getMinimizeToTray() &&
            !clientModel->getOptionsModel()->getMinimizeOnClose())
@@ -499,6 +509,7 @@ void BitcoinGUI::closeEvent(QCloseEvent *event)
             qApp->quit();
         }
 #endif
+    }
     QMainWindow::closeEvent(event);
 }
 
@@ -517,6 +528,8 @@ void BitcoinGUI::askFee(qint64 nFeeRequired, bool *payFee)
 
 void BitcoinGUI::incomingTransaction(const QModelIndex & parent, int start, int end)
 {
+    if(!walletModel || !clientModel)
+        return;
     TransactionTableModel *ttm = walletModel->getTransactionTableModel();
     qint64 amount = ttm->index(start, TransactionTableModel::Amount, parent)
                     .data(Qt::EditRole).toULongLong();
@@ -654,6 +667,8 @@ void BitcoinGUI::setEncryptionStatus(int status)
 
 void BitcoinGUI::encryptWallet(bool status)
 {
+    if(!walletModel)
+        return;
     AskPassphraseDialog dlg(status ? AskPassphraseDialog::Encrypt:
                                      AskPassphraseDialog::Decrypt, this);
     dlg.setModel(walletModel);
@@ -671,6 +686,8 @@ void BitcoinGUI::changePassphrase()
 
 void BitcoinGUI::unlockWallet()
 {
+    if(!walletModel)
+        return;
     // Unlock wallet when requested by wallet model
     if(walletModel->getEncryptionStatus() == WalletModel::Locked)
     {

src/qt/csvmodelwriter.cpp

@@ -48,7 +48,11 @@ bool CSVModelWriter::write()
         return false;
     QTextStream out(&file);
 
-    int numRows = model->rowCount();
+    int numRows = 0;
+    if(model)
+    {
+        numRows = model->rowCount();
+    }
 
     // Header row
     for(int i=0; i<columns.size(); ++i)

src/qt/editaddressdialog.cpp

@@ -56,6 +56,8 @@ void EditAddressDialog::loadRow(int row)
 
 bool EditAddressDialog::saveCurrentRow()
 {
+    if(!model)
+        return false;
     switch(mode)
     {
     case NewReceivingAddress:
@@ -78,6 +80,8 @@ bool EditAddressDialog::saveCurrentRow()
 
 void EditAddressDialog::accept()
 {
+    if(!model)
+        return;
     if(!saveCurrentRow())
     {
         switch(model->getEditStatus())

src/qt/overviewpage.cpp

@@ -143,7 +143,8 @@ void OverviewPage::setNumTransactions(int count)
 void OverviewPage::setModel(WalletModel *model)
 {
     this->model = model;
-
+    if(model)
+    {
         // Set up transaction list
         TransactionFilterProxy *filter = new TransactionFilterProxy();
         filter->setSourceModel(model->getTransactionTableModel());
@@ -163,10 +164,13 @@ void OverviewPage::setModel(WalletModel *model)
         connect(model, SIGNAL(numTransactionsChanged(int)), this, SLOT(setNumTransactions(int)));
 
         connect(model->getOptionsModel(), SIGNAL(displayUnitChanged(int)), this, SLOT(displayUnitChanged()));
+    }
 }
 
 void OverviewPage::displayUnitChanged()
 {
+    if(!model || !model->getOptionsModel())
+        return;
     if(currentBalance != -1)
         setBalance(currentBalance, currentUnconfirmedBalance);
 

src/qt/sendcoinsdialog.cpp

@@ -43,9 +43,11 @@ void SendCoinsDialog::setModel(WalletModel *model)
             entry->setModel(model);
         }
     }
-
+    if(model)
+    {
         setBalance(model->getBalance(), model->getUnconfirmedBalance());
         connect(model, SIGNAL(balanceChanged(qint64, qint64)), this, SLOT(setBalance(qint64, qint64)));
+    }
 }
 
 SendCoinsDialog::~SendCoinsDialog()
@@ -57,6 +59,10 @@ void SendCoinsDialog::on_sendButton_clicked()
 {
     QList<SendCoinsRecipient> recipients;
     bool valid = true;
+
+    if(!model)
+        return;
+
     for(int i = 0; i < ui->entries->count(); ++i)
     {
         SendCoinsEntry *entry = qobject_cast<SendCoinsEntry*>(ui->entries->itemAt(i)->widget());
@@ -255,6 +261,9 @@ void SendCoinsDialog::handleURL(const QUrl *url)
 void SendCoinsDialog::setBalance(qint64 balance, qint64 unconfirmedBalance)
 {
     Q_UNUSED(unconfirmedBalance);
+    if(!model || !model->getOptionsModel())
+        return;
+
     int unit = model->getOptionsModel()->getDisplayUnit();
     ui->labelBalance->setText(BitcoinUnits::formatWithUnit(unit, balance));
 }

src/qt/sendcoinsentry.cpp

@@ -44,6 +44,8 @@ void SendCoinsEntry::on_pasteButton_clicked()
 
 void SendCoinsEntry::on_addressBookButton_clicked()
 {
+    if(!model)
+        return;
     AddressBookPage dlg(AddressBookPage::ForSending, AddressBookPage::SendingTab, this);
     dlg.setModel(model->getAddressTableModel());
     if(dlg.exec())
@@ -55,6 +57,8 @@ void SendCoinsEntry::on_addressBookButton_clicked()
 
 void SendCoinsEntry::on_payTo_textChanged(const QString &address)
 {
+    if(!model)
+        return;
     ui->addAsLabel->setText(model->getAddressTableModel()->labelForAddress(address));
 }
 
@@ -74,7 +78,7 @@ void SendCoinsEntry::clear()
     ui->addAsLabel->clear();
     ui->payAmount->clear();
     ui->payTo->setFocus();
-    if(model)
+    if(model && model->getOptionsModel())
     {
         ui->payAmount->setDisplayUnit(model->getOptionsModel()->getDisplayUnit());
     }

src/qt/transactionview.cpp

@@ -155,7 +155,8 @@ TransactionView::TransactionView(QWidget *parent) :
 void TransactionView::setModel(WalletModel *model)
 {
     this->model = model;
-
+    if(model)
+    {
         transactionProxyModel = new TransactionFilterProxy(this);
         transactionProxyModel->setSourceModel(model->getTransactionTableModel());
         transactionProxyModel->setDynamicSortFilter(true);
@@ -180,11 +181,13 @@ void TransactionView::setModel(WalletModel *model)
                 TransactionTableModel::ToAddress, QHeaderView::Stretch);
         transactionView->horizontalHeader()->resizeSection(
                 TransactionTableModel::Amount, 100);
-
+    }
 }
 
 void TransactionView::chooseDate(int idx)
 {
+    if(!transactionProxyModel)
+        return;
     QDate current = QDate::currentDate();
     dateRangeWidget->setVisible(false);
     switch(dateWidget->itemData(idx).toInt())
@@ -231,17 +234,23 @@ void TransactionView::chooseDate(int idx)
 
 void TransactionView::chooseType(int idx)
 {
+    if(!transactionProxyModel)
+        return;
     transactionProxyModel->setTypeFilter(
         typeWidget->itemData(idx).toInt());
 }
 
 void TransactionView::changedPrefix(const QString &prefix)
 {
+    if(!transactionProxyModel)
+        return;
     transactionProxyModel->setAddressPrefix(prefix);
 }
 
 void TransactionView::changedAmount(const QString &amount)
 {
+    if(!transactionProxyModel)
+        return;
     qint64 amount_parsed = 0;
     if(BitcoinUnits::parse(model->getOptionsModel()->getDisplayUnit(), amount, &amount_parsed))
     {
@@ -294,6 +303,8 @@ void TransactionView::contextualMenu(const QPoint &point)
 
 void TransactionView::copyAddress()
 {
+    if(!transactionView->selectionModel())
+        return;
     QModelIndexList selection = transactionView->selectionModel()->selectedRows();
     if(!selection.isEmpty())
     {
@@ -303,6 +314,8 @@ void TransactionView::copyAddress()
 
 void TransactionView::copyLabel()
 {
+    if(!transactionView->selectionModel())
+        return;
     QModelIndexList selection = transactionView->selectionModel()->selectedRows();
     if(!selection.isEmpty())
     {
@@ -312,10 +325,14 @@ void TransactionView::copyLabel()
 
 void TransactionView::editLabel()
 {
+    if(!transactionView->selectionModel() ||!model)
+        return;
     QModelIndexList selection = transactionView->selectionModel()->selectedRows();
     if(!selection.isEmpty())
     {
         AddressTableModel *addressBook = model->getAddressTableModel();
+        if(!addressBook)
+            return;
         QString address = selection.at(0).data(TransactionTableModel::AddressRole).toString();
         if(address.isEmpty())
         {
@@ -354,6 +371,8 @@ void TransactionView::editLabel()
 
 void TransactionView::showDetails()
 {
+    if(!transactionView->selectionModel())
+        return;
     QModelIndexList selection = transactionView->selectionModel()->selectedRows();
     if(!selection.isEmpty())
     {
@@ -400,6 +419,8 @@ QWidget *TransactionView::createDateRangeWidget()
 
 void TransactionView::dateRangeChanged()
 {
+    if(!transactionProxyModel)
+        return;
     transactionProxyModel->setDateRange(
             QDateTime(dateFrom->date()),
             QDateTime(dateTo->date()).addDays(1));