src/qt/bitcoingui.cpp

   1 /*
   2  * Qt4 bitcoin GUI.
   3  *
   4  * W.J. van der Laan 2011
   5  */
   6 #include "bitcoingui.h"
   7 #include "transactiontablemodel.h"
   8 #include "addressbookpage.h"
   9 #include "sendcoinsdialog.h"
  10 #include "optionsdialog.h"
  11 #include "aboutdialog.h"
  12 #include "clientmodel.h"
  13 #include "walletmodel.h"
  14 #include "editaddressdialog.h"
  15 #include "optionsmodel.h"
  16 #include "transactiondescdialog.h"
  17 #include "addresstablemodel.h"
  18 #include "transactionview.h"
  19 #include "overviewpage.h"
  20 #include "bitcoinunits.h"
  21 #include "guiconstants.h"
  22 #include "askpassphrasedialog.h"
  23 #include "notificator.h"
  24 #include "qtwin.h"
  25
  26 #include <QApplication>
  27 #include <QMainWindow>
  28 #include <QMenuBar>
  29 #include <QMenu>
  30 #include <QIcon>
  31 #include <QTabWidget>
  32 #include <QVBoxLayout>
  33 #include <QToolBar>
  34 #include <QStatusBar>
  35 #include <QLabel>
  36 #include <QLineEdit>
  37 #include <QPushButton>
  38 #include <QLocale>
  39 #include <QMessageBox>
  40 #include <QProgressBar>
  41 #include <QStackedWidget>
  42 #include <QDateTime>
  43 #include <QMovie>
  44
  45 #include <QDragEnterEvent>
  46 #include <QUrl>
  47
  48 #include <iostream>
  49
  50 BitcoinGUI::BitcoinGUI(QWidget *parent):
  51     QMainWindow(parent),
  52     clientModel(0),
  53     walletModel(0),
  54     encryptWalletAction(0),
  55     changePassphraseAction(0),
  56     trayIcon(0),
  57     notificator(0)
  58 {
  59     resize(850, 550);
  60     setWindowTitle(tr("Bitcoin Wallet"));
  61     setWindowIcon(QIcon(":icons/bitcoin"));
  62     // Accept D&D of URIs
  63     setAcceptDrops(true);
  64
  65     createActions();
  66
  67     // Menus
  68     QMenu *file = menuBar()->addMenu(tr("&File"));
  69     file->addAction(sendCoinsAction);
  70     file->addAction(receiveCoinsAction);
  71     file->addSeparator();
  72     file->addAction(quitAction);
  73
  74     QMenu *settings = menuBar()->addMenu(tr("&Settings"));
  75     settings->addAction(encryptWalletAction);
  76     settings->addAction(changePassphraseAction);
  77     settings->addSeparator();
  78     settings->addAction(optionsAction);
  79
  80     QMenu *help = menuBar()->addMenu(tr("&Help"));
  81     help->addAction(aboutAction);
  82
  83     // Toolbars
  84     QToolBar *toolbar = addToolBar(tr("Tabs toolbar"));
  85     toolbar->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
  86     toolbar->addAction(overviewAction);
  87     toolbar->addAction(sendCoinsAction);
  88     toolbar->addAction(receiveCoinsAction);
  89     toolbar->addAction(historyAction);
  90     toolbar->addAction(addressBookAction);
  91
  92     QToolBar *toolbar2 = addToolBar(tr("Actions toolbar"));
  93     toolbar2->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
  94     toolbar2->addAction(exportAction);
  95
  96     // Create tabs
  97     overviewPage = new OverviewPage();
  98
  99     transactionsPage = new QWidget(this);
 100     QVBoxLayout *vbox = new QVBoxLayout();
 101     transactionView = new TransactionView(this);
 102     vbox->addWidget(transactionView);
 103     transactionsPage->setLayout(vbox);
 104
 105     addressBookPage = new AddressBookPage(AddressBookPage::ForEditing, AddressBookPage::SendingTab);
 106
 107     receiveCoinsPage = new AddressBookPage(AddressBookPage::ForEditing, AddressBookPage::ReceivingTab);
 108
 109     sendCoinsPage = new SendCoinsDialog(this);
 110
 111     centralWidget = new QStackedWidget(this);
 112     centralWidget->addWidget(overviewPage);
 113     centralWidget->addWidget(transactionsPage);
 114     centralWidget->addWidget(addressBookPage);
 115     centralWidget->addWidget(receiveCoinsPage);
 116     centralWidget->addWidget(sendCoinsPage);
 117     setCentralWidget(centralWidget);
 118
 119     // Create status bar
 120     statusBar();
 121
 122     // Status bar notification icons
 123     QFrame *frameBlocks = new QFrame();
 124     //frameBlocks->setFrameStyle(QFrame::Panel | QFrame::Sunken);
 125     frameBlocks->setContentsMargins(0,0,0,0);
 126     frameBlocks->setMinimumWidth(56);
 127     frameBlocks->setMaximumWidth(56);
 128     QHBoxLayout *frameBlocksLayout = new QHBoxLayout(frameBlocks);
 129     frameBlocksLayout->setContentsMargins(3,0,3,0);
 130     frameBlocksLayout->setSpacing(3);
 131     labelEncryptionIcon = new QLabel();
 132     labelConnectionsIcon = new QLabel();
 133     labelBlocksIcon = new QLabel();
 134     frameBlocksLayout->addStretch();
 135     frameBlocksLayout->addWidget(labelEncryptionIcon);
 136     frameBlocksLayout->addStretch();
 137     frameBlocksLayout->addWidget(labelConnectionsIcon);
 138     frameBlocksLayout->addStretch();
 139     frameBlocksLayout->addWidget(labelBlocksIcon);
 140     frameBlocksLayout->addStretch();
 141
 142     // Progress bar for blocks download
 143     progressBarLabel = new QLabel(tr("Synchronizing with network..."));
 144     progressBarLabel->setVisible(false);
 145     progressBar = new QProgressBar();
 146     progressBar->setToolTip(tr("Block chain synchronization in progress"));
 147     progressBar->setVisible(false);
 148
 149     statusBar()->addWidget(progressBarLabel);
 150     statusBar()->addWidget(progressBar);
 151     statusBar()->addPermanentWidget(frameBlocks);
 152
 153     createTrayIcon();
 154
 155     syncIconMovie = new QMovie(":/movies/update_spinner", "mng", this);
 156
 157     // Clicking on a transaction on the overview page simply sends you to transaction history page
 158     connect(overviewPage, SIGNAL(transactionClicked(QModelIndex)), this, SLOT(gotoHistoryPage()));
 159
 160     // Doubleclicking on a transaction on the transaction history page shows details
 161     connect(transactionView, SIGNAL(doubleClicked(QModelIndex)), transactionView, SLOT(showDetails()));
 162
 163 #ifdef Q_OS_WIN
 164     // Windows-specific customization
 165     if (QtWin::isCompositionEnabled())
 166     {
 167         QtWin::extendFrameIntoClientArea(this);
 168         setContentsMargins(0, 0, 0, 0);
 169     }
 170 #endif
 171     setWindowComposition();
 172
 173     gotoOverviewPage();
 174 }
 175
 176 void BitcoinGUI::createActions()
 177 {
 178     QActionGroup *tabGroup = new QActionGroup(this);
 179
 180     overviewAction = new QAction(QIcon(":/icons/overview"), tr("&Overview"), this);
 181     overviewAction->setToolTip(tr("Show general overview of wallet"));
 182     overviewAction->setCheckable(true);
 183     tabGroup->addAction(overviewAction);
 184
 185     historyAction = new QAction(QIcon(":/icons/history"), tr("&Transactions"), this);
 186     historyAction->setToolTip(tr("Browse transaction history"));
 187     historyAction->setCheckable(true);
 188     tabGroup->addAction(historyAction);
 189
 190     addressBookAction = new QAction(QIcon(":/icons/address-book"), tr("&Address Book"), this);
 191     addressBookAction->setToolTip(tr("Edit the list of stored addresses and labels"));
 192     addressBookAction->setCheckable(true);
 193     tabGroup->addAction(addressBookAction);
 194
 195     receiveCoinsAction = new QAction(QIcon(":/icons/receiving_addresses"), tr("&Receive coins"), this);
 196     receiveCoinsAction->setToolTip(tr("Show the list of addresses for receiving payments"));
 197     receiveCoinsAction->setCheckable(true);
 198     tabGroup->addAction(receiveCoinsAction);
 199
 200     sendCoinsAction = new QAction(QIcon(":/icons/send"), tr("&Send coins"), this);
 201     sendCoinsAction->setToolTip(tr("Send coins to a bitcoin address"));
 202     sendCoinsAction->setCheckable(true);
 203     tabGroup->addAction(sendCoinsAction);
 204
 205     connect(overviewAction, SIGNAL(triggered()), this, SLOT(gotoOverviewPage()));
 206     connect(historyAction, SIGNAL(triggered()), this, SLOT(gotoHistoryPage()));
 207     connect(addressBookAction, SIGNAL(triggered()), this, SLOT(gotoAddressBookPage()));
 208     connect(receiveCoinsAction, SIGNAL(triggered()), this, SLOT(gotoReceiveCoinsPage()));
 209     connect(sendCoinsAction, SIGNAL(triggered()), this, SLOT(gotoSendCoinsPage()));
 210
 211     quitAction = new QAction(QIcon(":/icons/quit"), tr("&Exit"), this);
 212     quitAction->setToolTip(tr("Quit application"));
 213     aboutAction = new QAction(QIcon(":/icons/bitcoin"), tr("&About"), this);
 214     aboutAction->setToolTip(tr("Show information about Bitcoin"));
 215     optionsAction = new QAction(QIcon(":/icons/options"), tr("&Options..."), this);
 216     optionsAction->setToolTip(tr("Modify configuration options for bitcoin"));
 217     openBitcoinAction = new QAction(QIcon(":/icons/bitcoin"), tr("Open &Bitcoin"), this);
 218     openBitcoinAction->setToolTip(tr("Show the Bitcoin window"));
 219     exportAction = new QAction(QIcon(":/icons/export"), tr("&Export..."), this);
 220     exportAction->setToolTip(tr("Export the current view to a file"));
 221     encryptWalletAction = new QAction(QIcon(":/icons/lock_closed"), tr("&Encrypt Wallet"), this);
 222     encryptWalletAction->setToolTip(tr("Encrypt or decrypt wallet"));
 223     encryptWalletAction->setCheckable(true);
 224     changePassphraseAction = new QAction(QIcon(":/icons/key"), tr("&Change Passphrase"), this);
 225     changePassphraseAction->setToolTip(tr("Change the passphrase used for wallet encryption"));
 226
 227     connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
 228     connect(optionsAction, SIGNAL(triggered()), this, SLOT(optionsClicked()));
 229     connect(aboutAction, SIGNAL(triggered()), this, SLOT(aboutClicked()));
 230     connect(openBitcoinAction, SIGNAL(triggered()), this, SLOT(showNormal()));
 231     connect(encryptWalletAction, SIGNAL(triggered(bool)), this, SLOT(encryptWallet(bool)));
 232     connect(changePassphraseAction, SIGNAL(triggered()), this, SLOT(changePassphrase()));
 233 }
 234
 235 void BitcoinGUI::setClientModel(ClientModel *clientModel)
 236 {
 237     this->clientModel = clientModel;
 238
 239     if(clientModel->isTestNet())
 240     {
 241         QString title_testnet = windowTitle() + QString(" ") + tr("[testnet]");
 242         setWindowTitle(title_testnet);
 243         setWindowIcon(QIcon(":icons/bitcoin_testnet"));
 244         if(trayIcon)
 245         {
 246             trayIcon->setToolTip(title_testnet);
 247             trayIcon->setIcon(QIcon(":/icons/toolbar_testnet"));
 248         }
 249     }
 250
 251     // Keep up to date with client
 252     setNumConnections(clientModel->getNumConnections());
 253     connect(clientModel, SIGNAL(numConnectionsChanged(int)), this, SLOT(setNumConnections(int)));
 254
 255     setNumBlocks(clientModel->getNumBlocks());
 256     connect(clientModel, SIGNAL(numBlocksChanged(int)), this, SLOT(setNumBlocks(int)));
 257
 258     // Report errors from network/worker thread
 259     connect(clientModel, SIGNAL(error(QString,QString)), this, SLOT(error(QString,QString)));
 260 }
 261
 262 void BitcoinGUI::setWalletModel(WalletModel *walletModel)
 263 {
 264     this->walletModel = walletModel;
 265
 266     // Report errors from wallet thread
 267     connect(walletModel, SIGNAL(error(QString,QString)), this, SLOT(error(QString,QString)));
 268
 269     // Put transaction list in tabs
 270     transactionView->setModel(walletModel);
 271
 272     overviewPage->setModel(walletModel);
 273     addressBookPage->setModel(walletModel->getAddressTableModel());
 274     receiveCoinsPage->setModel(walletModel->getAddressTableModel());
 275     sendCoinsPage->setModel(walletModel);
 276
 277     setEncryptionStatus(walletModel->getEncryptionStatus());
 278     connect(walletModel, SIGNAL(encryptionStatusChanged(int)), this, SLOT(setEncryptionStatus(int)));
 279
 280     // Balloon popup for new transaction
 281     connect(walletModel->getTransactionTableModel(), SIGNAL(rowsInserted(QModelIndex,int,int)),
 282             this, SLOT(incomingTransaction(QModelIndex,int,int)));
 283
 284     // Ask for passphrase if needed
 285     connect(walletModel, SIGNAL(requireUnlock()), this, SLOT(unlockWallet()));
 286 }
 287
 288 void BitcoinGUI::createTrayIcon()
 289 {
 290     QMenu *trayIconMenu = new QMenu(this);
 291     trayIconMenu->addAction(openBitcoinAction);
 292     trayIconMenu->addAction(optionsAction);
 293     trayIconMenu->addSeparator();
 294     trayIconMenu->addAction(quitAction);
 295
 296     trayIcon = new QSystemTrayIcon(this);
 297     trayIcon->setContextMenu(trayIconMenu);
 298     trayIcon->setToolTip("Bitcoin client");
 299     trayIcon->setIcon(QIcon(":/icons/toolbar"));
 300     connect(trayIcon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)),
 301             this, SLOT(trayIconActivated(QSystemTrayIcon::ActivationReason)));
 302     trayIcon->show();
 303
 304     notificator = new Notificator(tr("bitcoin-qt"), trayIcon);
 305 }
 306
 307 void BitcoinGUI::trayIconActivated(QSystemTrayIcon::ActivationReason reason)
 308 {
 309     if(reason == QSystemTrayIcon::Trigger)
 310     {
 311         // Click on system tray icon triggers "open bitcoin"
 312         openBitcoinAction->trigger();
 313     }
 314
 315 }
 316
 317 void BitcoinGUI::optionsClicked()
 318 {
 319     OptionsDialog dlg;
 320     dlg.setModel(clientModel->getOptionsModel());
 321     dlg.exec();
 322 }
 323
 324 void BitcoinGUI::aboutClicked()
 325 {
 326     AboutDialog dlg;
 327     dlg.setModel(clientModel);
 328     dlg.exec();
 329 }
 330
 331 void BitcoinGUI::setNumConnections(int count)
 332 {
 333     QString icon;
 334     switch(count)
 335     {
 336     case 0: icon = ":/icons/connect_0"; break;
 337     case 1: case 2: case 3: icon = ":/icons/connect_1"; break;
 338     case 4: case 5: case 6: icon = ":/icons/connect_2"; break;
 339     case 7: case 8: case 9: icon = ":/icons/connect_3"; break;
 340     default: icon = ":/icons/connect_4"; break;
 341     }
 342     labelConnectionsIcon->setPixmap(QIcon(icon).pixmap(STATUSBAR_ICONSIZE,STATUSBAR_ICONSIZE));
 343     labelConnectionsIcon->setToolTip(tr("%n active connection(s) to Bitcoin network", "", count));
 344 }
 345
 346 void BitcoinGUI::setNumBlocks(int count)
 347 {
 348     int initTotal = clientModel->getNumBlocksAtStartup();
 349     int total = clientModel->getNumBlocksOfPeers();
 350     QString tooltip;
 351
 352     if(count < total)
 353     {
 354         progressBarLabel->setVisible(true);
 355         progressBar->setVisible(true);
 356         progressBar->setMaximum(total - initTotal);
 357         progressBar->setValue(count - initTotal);
 358         tooltip = tr("Downloaded %1 of %2 blocks of transaction history.").arg(count).arg(total);
 359     }
 360     else
 361     {
 362         progressBarLabel->setVisible(false);
 363         progressBar->setVisible(false);
 364         tooltip = tr("Downloaded %1 blocks of transaction history.").arg(count);
 365     }
 366
 367     QDateTime now = QDateTime::currentDateTime();
 368     QDateTime lastBlockDate = clientModel->getLastBlockDate();
 369     int secs = lastBlockDate.secsTo(now);
 370     QString text;
 371
 372     // Represent time from last generated block in human readable text
 373     if(secs < 60)
 374     {
 375         text = tr("%n second(s) ago","",secs);
 376     }
 377     else if(secs < 60*60)
 378     {
 379         text = tr("%n minute(s) ago","",secs/60);
 380     }
 381     else if(secs < 24*60*60)
 382     {
 383         text = tr("%n hour(s) ago","",secs/(60*60));
 384     }
 385     else
 386     {
 387         text = tr("%n day(s) ago","",secs/(60*60*24));
 388     }
 389
 390     // Set icon state: spinning if catching up, tick otherwise
 391     if(secs < 30*60)
 392     {
 393         tooltip = tr("Up to date") + QString("\n") + tooltip;
 394         labelBlocksIcon->setPixmap(QIcon(":/icons/synced").pixmap(STATUSBAR_ICONSIZE,STATUSBAR_ICONSIZE));
 395     }
 396     else
 397     {
 398         tooltip = tr("Catching up...") + QString("\n") + tooltip;
 399         labelBlocksIcon->setMovie(syncIconMovie);
 400         syncIconMovie->start();
 401     }
 402
 403     tooltip += QString("\n");
 404     tooltip += tr("Last received block was generated %1.").arg(text);
 405
 406     labelBlocksIcon->setToolTip(tooltip);
 407     progressBarLabel->setToolTip(tooltip);
 408     progressBar->setToolTip(tooltip);
 409 }
 410
 411 void BitcoinGUI::error(const QString &title, const QString &message)
 412 {
 413     // Report errors from network/worker thread
 414     notificator->notify(Notificator::Critical, title, message);
 415 }
 416
 417 void BitcoinGUI::changeEvent(QEvent *e)
 418 {
 419     if (e->type() == QEvent::WindowStateChange)
 420     {
 421         if(clientModel->getOptionsModel()->getMinimizeToTray())
 422         {
 423             if (isMinimized())
 424             {
 425                 hide();
 426                 e->ignore();
 427             }
 428             else
 429             {
 430                 show();
 431                 e->accept();
 432             }
 433         }
 434     }
 435     setWindowComposition();
 436     QMainWindow::changeEvent(e);
 437 }
 438
 439 void BitcoinGUI::closeEvent(QCloseEvent *event)
 440 {
 441     if(!clientModel->getOptionsModel()->getMinimizeToTray() &&
 442        !clientModel->getOptionsModel()->getMinimizeOnClose())
 443     {
 444         qApp->quit();
 445     }
 446     QMainWindow::closeEvent(event);
 447 }
 448
 449 void BitcoinGUI::setWindowComposition()
 450 {
 451 #ifdef Q_OS_WIN
 452     // Make the background transparent on Windows Vista or 7, except when maximized
 453     // Otherwise text becomes hard to read
 454     if (QtWin::isCompositionEnabled())
 455     {
 456         QPalette pal = palette();
 457         QColor bg = pal.window().color();
 458         if(isMaximized())
 459         {
 460             setAttribute(Qt::WA_TranslucentBackground, false);
 461             setAttribute(Qt::WA_StyledBackground, true);
 462             QBrush wb = pal.window();
 463             bg = wb.color();
 464             bg.setAlpha(255);
 465             pal.setColor(QPalette::Window, bg);
 466             setPalette(pal);
 467
 468         }
 469         else
 470         {
 471             setAttribute(Qt::WA_TranslucentBackground);
 472             setAttribute(Qt::WA_StyledBackground, false);
 473             bg.setAlpha(0);
 474             pal.setColor(QPalette::Window, bg);
 475             setPalette(pal);
 476             setAttribute(Qt::WA_NoSystemBackground, false);
 477             ensurePolished();
 478             setAttribute(Qt::WA_StyledBackground, false);
 479         }
 480     }
 481 #endif
 482 }
 483
 484 void BitcoinGUI::askFee(qint64 nFeeRequired, bool *payFee)
 485 {
 486     QString strMessage =
 487         tr("This transaction is over the size limit.  You can still send it for a fee of %1, "
 488           "which goes to the nodes that process your transaction and helps to support the network.  "
 489           "Do you want to pay the fee?").arg(
 490                 BitcoinUnits::formatWithUnit(BitcoinUnits::BTC, nFeeRequired));
 491     QMessageBox::StandardButton retval = QMessageBox::question(
 492           this, tr("Sending..."), strMessage,
 493           QMessageBox::Yes|QMessageBox::Cancel, QMessageBox::Yes);
 494     *payFee = (retval == QMessageBox::Yes);
 495 }
 496
 497 void BitcoinGUI::incomingTransaction(const QModelIndex & parent, int start, int end)
 498 {
 499     TransactionTableModel *ttm = walletModel->getTransactionTableModel();
 500     qint64 amount = ttm->index(start, TransactionTableModel::Amount, parent)
 501                     .data(Qt::EditRole).toULongLong();
 502     if(!clientModel->inInitialBlockDownload())
 503     {
 504         // On new transaction, make an info balloon
 505         // Unless the initial block download is in progress, to prevent balloon-spam
 506         QString date = ttm->index(start, TransactionTableModel::Date, parent)
 507                         .data().toString();
 508         QString type = ttm->index(start, TransactionTableModel::Type, parent)
 509                         .data().toString();
 510         QString address = ttm->index(start, TransactionTableModel::ToAddress, parent)
 511                         .data().toString();
 512         QIcon icon = qvariant_cast<QIcon>(ttm->index(start,
 513                             TransactionTableModel::ToAddress, parent)
 514                         .data(Qt::DecorationRole));
 515
 516         notificator->notify(Notificator::Information,
 517                             (amount)<0 ? tr("Sent transaction") :
 518                                          tr("Incoming transaction"),
 519                               tr("Date: %1\n"
 520                                  "Amount: %2\n"
 521                                  "Type: %3\n"
 522                                  "Address: %4\n")
 523                               .arg(date)
 524                               .arg(BitcoinUnits::formatWithUnit(walletModel->getOptionsModel()->getDisplayUnit(), amount, true))
 525                               .arg(type)
 526                               .arg(address), icon);
 527     }
 528 }
 529
 530 void BitcoinGUI::gotoOverviewPage()
 531 {
 532     overviewAction->setChecked(true);
 533     centralWidget->setCurrentWidget(overviewPage);
 534
 535     exportAction->setEnabled(false);
 536     disconnect(exportAction, SIGNAL(triggered()), 0, 0);
 537 }
 538
 539 void BitcoinGUI::gotoHistoryPage()
 540 {
 541     historyAction->setChecked(true);
 542     centralWidget->setCurrentWidget(transactionsPage);
 543
 544     exportAction->setEnabled(true);
 545     disconnect(exportAction, SIGNAL(triggered()), 0, 0);
 546     connect(exportAction, SIGNAL(triggered()), transactionView, SLOT(exportClicked()));
 547 }
 548
 549 void BitcoinGUI::gotoAddressBookPage()
 550 {
 551     addressBookAction->setChecked(true);
 552     centralWidget->setCurrentWidget(addressBookPage);
 553
 554     exportAction->setEnabled(true);
 555     disconnect(exportAction, SIGNAL(triggered()), 0, 0);
 556     connect(exportAction, SIGNAL(triggered()), addressBookPage, SLOT(exportClicked()));
 557 }
 558
 559 void BitcoinGUI::gotoReceiveCoinsPage()
 560 {
 561     receiveCoinsAction->setChecked(true);
 562     centralWidget->setCurrentWidget(receiveCoinsPage);
 563
 564     exportAction->setEnabled(true);
 565     disconnect(exportAction, SIGNAL(triggered()), 0, 0);
 566     connect(exportAction, SIGNAL(triggered()), receiveCoinsPage, SLOT(exportClicked()));
 567 }
 568
 569 void BitcoinGUI::gotoSendCoinsPage()
 570 {
 571     sendCoinsAction->setChecked(true);
 572     if(centralWidget->currentWidget() != sendCoinsPage)
 573     {
 574         // Clear the current contents if we arrived from another tab
 575         sendCoinsPage->clear();
 576     }
 577     centralWidget->setCurrentWidget(sendCoinsPage);
 578
 579     exportAction->setEnabled(false);
 580     disconnect(exportAction, SIGNAL(triggered()), 0, 0);
 581 }
 582
 583 void BitcoinGUI::dragEnterEvent(QDragEnterEvent *event)
 584 {
 585     // Accept only URLs
 586     if(event->mimeData()->hasUrls())
 587         event->acceptProposedAction();
 588 }
 589
 590 void BitcoinGUI::dropEvent(QDropEvent *event)
 591 {
 592     if(event->mimeData()->hasUrls())
 593     {
 594         gotoSendCoinsPage();
 595         QList<QUrl> urls = event->mimeData()->urls();
 596         foreach(const QUrl &url, urls)
 597         {
 598             sendCoinsPage->handleURL(&url);
 599         }
 600     }
 601
 602     event->acceptProposedAction();
 603 }
 604
 605 void BitcoinGUI::setEncryptionStatus(int status)
 606 {
 607     switch(status)
 608     {
 609     case WalletModel::Unencrypted:
 610         labelEncryptionIcon->hide();
 611         encryptWalletAction->setChecked(false);
 612         changePassphraseAction->setEnabled(false);
 613         encryptWalletAction->setEnabled(true);
 614         break;
 615     case WalletModel::Unlocked:
 616         labelEncryptionIcon->show();
 617         labelEncryptionIcon->setPixmap(QIcon(":/icons/lock_open").pixmap(STATUSBAR_ICONSIZE,STATUSBAR_ICONSIZE));
 618         labelEncryptionIcon->setToolTip(tr("Wallet is <b>encrypted</b> and currently <b>unlocked</b>"));
 619         encryptWalletAction->setChecked(true);
 620         changePassphraseAction->setEnabled(true);
 621         encryptWalletAction->setEnabled(false); // TODO: decrypt currently not supported
 622         break;
 623     case WalletModel::Locked:
 624         labelEncryptionIcon->show();
 625         labelEncryptionIcon->setPixmap(QIcon(":/icons/lock_closed").pixmap(STATUSBAR_ICONSIZE,STATUSBAR_ICONSIZE));
 626         labelEncryptionIcon->setToolTip(tr("Wallet is <b>encrypted</b> and currently <b>locked</b>"));
 627         encryptWalletAction->setChecked(true);
 628         changePassphraseAction->setEnabled(true);
 629         encryptWalletAction->setEnabled(false); // TODO: decrypt currently not supported
 630         break;
 631     }
 632 }
 633
 634 void BitcoinGUI::encryptWallet(bool status)
 635 {
 636     AskPassphraseDialog dlg(status ? AskPassphraseDialog::Encrypt:
 637                                      AskPassphraseDialog::Decrypt, this);
 638     dlg.setModel(walletModel);
 639     dlg.exec();
 640
 641     setEncryptionStatus(walletModel->getEncryptionStatus());
 642 }
 643
 644 void BitcoinGUI::changePassphrase()
 645 {
 646     AskPassphraseDialog dlg(AskPassphraseDialog::ChangePass, this);
 647     dlg.setModel(walletModel);
 648     dlg.exec();
 649 }
 650
 651 void BitcoinGUI::unlockWallet()
 652 {
 653     // Unlock wallet when requested by wallet model
 654     if(walletModel->getEncryptionStatus() == WalletModel::Locked)
 655     {
 656         AskPassphraseDialog dlg(AskPassphraseDialog::Unlock, this);
 657         dlg.setModel(walletModel);
 658         dlg.exec();
 659     }
 660 }