bitcoingui.cpp
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bitcoingui.cpp
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	/*
	* Qt4 bitcoin GUI.
	*
	* W.J. van der Laan 2011-2012
	* The Bitcoin Developers 2011-2012
	*/
	#include "bitcoingui.h"
	#include "transactiontablemodel.h"
	#include "addressbookpage.h"
	#include "sendcoinsdialog.h"
	#include "signverifymessagedialog.h"
	#include "optionsdialog.h"
	#include "aboutdialog.h"
	#include "clientmodel.h"
	#include "walletmodel.h"
	#include "editaddressdialog.h"
	#include "optionsmodel.h"
	#include "transactiondescdialog.h"
	#include "addresstablemodel.h"
	#include "transactionview.h"
	#include "overviewpage.h"
	#include "bitcoinunits.h"
	#include "guiconstants.h"
	#include "askpassphrasedialog.h"
	#include "notificator.h"
	#include "guiutil.h"
	#include "rpcconsole.h"
	#include "ui_interface.h"

	#ifdef Q_OS_MAC
	#include "macdockiconhandler.h"
	#endif

	#include <QApplication>
	#include <QMainWindow>
	#include <QMenuBar>
	#include <QMenu>
	#include <QIcon>
	#include <QTabWidget>
	#include <QVBoxLayout>
	#include <QToolBar>
	#include <QStatusBar>
	#include <QLabel>
	#include <QLineEdit>
	#include <QPushButton>
	#include <QLocale>
	#include <QMessageBox>
	#include <QProgressBar>
	#include <QStackedWidget>
	#include <QDateTime>
	#include <QMovie>
	#include <QFileDialog>
	#include <QDesktopServices>
	#include <QTimer>
	#include <QDragEnterEvent>
	#include <QUrl>
	#include <QStyle>

	#include <iostream>

	BitcoinGUI::BitcoinGUI(QWidget *parent):
	QMainWindow(parent),
	clientModel(0),
	walletModel(0),
	encryptWalletAction(0),
	changePassphraseAction(0),
	aboutQtAction(0),
	trayIcon(0),
	notificator(0),
	rpcConsole(0)
	{
	resize(850, 550);
	setWindowTitle(tr("Bitcoin") + " - " + tr("Wallet"));
	#ifndef Q_OS_MAC
	qApp->setWindowIcon(QIcon(":icons/bitcoin"));
	setWindowIcon(QIcon(":icons/bitcoin"));
	#else
	setUnifiedTitleAndToolBarOnMac(true);
	QApplication::setAttribute(Qt::AA_DontShowIconsInMenus);
	#endif
	// Accept D&D of URIs
	setAcceptDrops(true);

	// Create actions for the toolbar, menu bar and tray/dock icon
	createActions();

	// Create application menu bar
	createMenuBar();

	// Create the toolbars
	createToolBars();

	// Create system tray icon and notification
	createTrayIcon();

	// Create tabs
	overviewPage = new OverviewPage();

	transactionsPage = new QWidget(this);
	QVBoxLayout *vbox = new QVBoxLayout();
	transactionView = new TransactionView(this);
	vbox->addWidget(transactionView);
	transactionsPage->setLayout(vbox);

	addressBookPage = new AddressBookPage(AddressBookPage::ForEditing, AddressBookPage::SendingTab);

	receiveCoinsPage = new AddressBookPage(AddressBookPage::ForEditing, AddressBookPage::ReceivingTab);

	sendCoinsPage = new SendCoinsDialog(this);

	signVerifyMessageDialog = new SignVerifyMessageDialog(this);

	centralWidget = new QStackedWidget(this);
	centralWidget->addWidget(overviewPage);
	centralWidget->addWidget(transactionsPage);
	centralWidget->addWidget(addressBookPage);
	centralWidget->addWidget(receiveCoinsPage);
	centralWidget->addWidget(sendCoinsPage);
	setCentralWidget(centralWidget);

	// Create status bar
	statusBar();

	// Status bar notification icons
	QFrame *frameBlocks = new QFrame();
	frameBlocks->setContentsMargins(0,0,0,0);
	frameBlocks->setMinimumWidth(56);
	frameBlocks->setMaximumWidth(56);
	QHBoxLayout *frameBlocksLayout = new QHBoxLayout(frameBlocks);
	frameBlocksLayout->setContentsMargins(3,0,3,0);
	frameBlocksLayout->setSpacing(3);
	labelEncryptionIcon = new QLabel();
	labelConnectionsIcon = new QLabel();
	labelBlocksIcon = new QLabel();
	frameBlocksLayout->addStretch();
	frameBlocksLayout->addWidget(labelEncryptionIcon);
	frameBlocksLayout->addStretch();
	frameBlocksLayout->addWidget(labelConnectionsIcon);
	frameBlocksLayout->addStretch();
	frameBlocksLayout->addWidget(labelBlocksIcon);
	frameBlocksLayout->addStretch();

	// Progress bar and label for blocks download
	progressBarLabel = new QLabel();
	progressBarLabel->setVisible(false);
	progressBar = new QProgressBar();
	progressBar->setAlignment(Qt::AlignCenter);
	progressBar->setVisible(false);

	// Override style sheet for progress bar for styles that have a segmented progress bar,
	// as they make the text unreadable (workaround for issue #1071)
	// See https://qt-project.org/doc/qt-4.8/gallery.html
	QString curStyle = qApp->style()->metaObject()->className();
	if(curStyle == "QWindowsStyle" \|\| curStyle == "QWindowsXPStyle")
	{
	progressBar->setStyleSheet("QProgressBar { background-color: #e8e8e8; border: 1px solid grey; border-radius: 7px; padding: 1px; text-align: center; } QProgressBar::chunk { background: QLinearGradient(x1: 0, y1: 0, x2: 1, y2: 0, stop: 0 #FF8000, stop: 1 orange); border-radius: 7px; margin: 0px; }");
	}

	statusBar()->addWidget(progressBarLabel);
	statusBar()->addWidget(progressBar);
	statusBar()->addPermanentWidget(frameBlocks);

	syncIconMovie = new QMovie(":/movies/update_spinner", "mng", this);

	// Clicking on a transaction on the overview page simply sends you to transaction history page
	connect(overviewPage, SIGNAL(transactionClicked(QModelIndex)), this, SLOT(gotoHistoryPage()));
	connect(overviewPage, SIGNAL(transactionClicked(QModelIndex)), transactionView, SLOT(focusTransaction(QModelIndex)));

	// Double-clicking on a transaction on the transaction history page shows details
	connect(transactionView, SIGNAL(doubleClicked(QModelIndex)), transactionView, SLOT(showDetails()));

	rpcConsole = new RPCConsole(this);
	connect(openRPCConsoleAction, SIGNAL(triggered()), rpcConsole, SLOT(show()));

	// Clicking on "Verify Message" in the address book sends you to the verify message tab
	connect(addressBookPage, SIGNAL(verifyMessage(QString)), this, SLOT(gotoVerifyMessageTab(QString)));
	// Clicking on "Sign Message" in the receive coins page sends you to the sign message tab
	connect(receiveCoinsPage, SIGNAL(signMessage(QString)), this, SLOT(gotoSignMessageTab(QString)));

	// Install event filter to be able to catch status tip events (QEvent::StatusTip)
	this->installEventFilter(this);

	gotoOverviewPage();
	}

	BitcoinGUI::~BitcoinGUI()
	{
	if(trayIcon) // Hide tray icon, as deleting will let it linger until quit (on Ubuntu)
	trayIcon->hide();
	#ifdef Q_OS_MAC
	delete appMenuBar;
	#endif
	}

	void BitcoinGUI::createActions()
	{
	QActionGroup *tabGroup = new QActionGroup(this);

	overviewAction = new QAction(QIcon(":/icons/overview"), tr("&Overview"), this);
	overviewAction->setStatusTip(tr("Show general overview of wallet"));
	overviewAction->setToolTip(overviewAction->statusTip());
	overviewAction->setCheckable(true);
	overviewAction->setShortcut(QKeySequence(Qt::ALT + Qt::Key_1));
	tabGroup->addAction(overviewAction);

	sendCoinsAction = new QAction(QIcon(":/icons/send"), tr("&Send coins"), this);
	sendCoinsAction->setStatusTip(tr("Send coins to a Bitcoin address"));
	sendCoinsAction->setToolTip(sendCoinsAction->statusTip());
	sendCoinsAction->setCheckable(true);
	sendCoinsAction->setShortcut(QKeySequence(Qt::ALT + Qt::Key_2));
	tabGroup->addAction(sendCoinsAction);

	receiveCoinsAction = new QAction(QIcon(":/icons/receiving_addresses"), tr("&Receive coins"), this);
	receiveCoinsAction->setStatusTip(tr("Show the list of addresses for receiving payments"));
	receiveCoinsAction->setToolTip(receiveCoinsAction->statusTip());
	receiveCoinsAction->setCheckable(true);
	receiveCoinsAction->setShortcut(QKeySequence(Qt::ALT + Qt::Key_3));
	tabGroup->addAction(receiveCoinsAction);

	historyAction = new QAction(QIcon(":/icons/history"), tr("&Transactions"), this);
	historyAction->setStatusTip(tr("Browse transaction history"));
	historyAction->setToolTip(historyAction->statusTip());
	historyAction->setCheckable(true);
	historyAction->setShortcut(QKeySequence(Qt::ALT + Qt::Key_4));
	tabGroup->addAction(historyAction);

	addressBookAction = new QAction(QIcon(":/icons/address-book"), tr("&Address Book"), this);
	addressBookAction->setStatusTip(tr("Edit the list of stored addresses and labels"));
	addressBookAction->setToolTip(addressBookAction->statusTip());
	addressBookAction->setCheckable(true);
	addressBookAction->setShortcut(QKeySequence(Qt::ALT + Qt::Key_5));
	tabGroup->addAction(addressBookAction);

	connect(overviewAction, SIGNAL(triggered()), this, SLOT(showNormalIfMinimized()));
	connect(overviewAction, SIGNAL(triggered()), this, SLOT(gotoOverviewPage()));
	connect(sendCoinsAction, SIGNAL(triggered()), this, SLOT(showNormalIfMinimized()));
	connect(sendCoinsAction, SIGNAL(triggered()), this, SLOT(gotoSendCoinsPage()));
	connect(receiveCoinsAction, SIGNAL(triggered()), this, SLOT(showNormalIfMinimized()));
	connect(receiveCoinsAction, SIGNAL(triggered()), this, SLOT(gotoReceiveCoinsPage()));
	connect(historyAction, SIGNAL(triggered()), this, SLOT(showNormalIfMinimized()));
	connect(historyAction, SIGNAL(triggered()), this, SLOT(gotoHistoryPage()));
	connect(addressBookAction, SIGNAL(triggered()), this, SLOT(showNormalIfMinimized()));
	connect(addressBookAction, SIGNAL(triggered()), this, SLOT(gotoAddressBookPage()));

	quitAction = new QAction(QIcon(":/icons/quit"), tr("E&xit"), this);
	quitAction->setStatusTip(tr("Quit application"));
	quitAction->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_Q));
	quitAction->setMenuRole(QAction::QuitRole);
	aboutAction = new QAction(QIcon(":/icons/bitcoin"), tr("&About Bitcoin"), this);
	aboutAction->setStatusTip(tr("Show information about Bitcoin"));
	aboutAction->setMenuRole(QAction::AboutRole);
	aboutQtAction = new QAction(QIcon(":/trolltech/qmessagebox/images/qtlogo-64.png"), tr("About &Qt"), this);
	aboutQtAction->setStatusTip(tr("Show information about Qt"));
	aboutQtAction->setMenuRole(QAction::AboutQtRole);
	optionsAction = new QAction(QIcon(":/icons/options"), tr("&Options..."), this);
	optionsAction->setStatusTip(tr("Modify configuration options for Bitcoin"));
	optionsAction->setMenuRole(QAction::PreferencesRole);
	toggleHideAction = new QAction(QIcon(":/icons/bitcoin"), tr("&Show / Hide"), this);
	toggleHideAction->setStatusTip(tr("Show or hide the main Window"));
	encryptWalletAction = new QAction(QIcon(":/icons/lock_closed"), tr("&Encrypt Wallet..."), this);
	encryptWalletAction->setStatusTip(tr("Encrypt the private keys that belong to your wallet"));
	encryptWalletAction->setCheckable(true);
	backupWalletAction = new QAction(QIcon(":/icons/filesave"), tr("&Backup Wallet..."), this);
	backupWalletAction->setStatusTip(tr("Backup wallet to another location"));
	changePassphraseAction = new QAction(QIcon(":/icons/key"), tr("&Change Passphrase..."), this);
	changePassphraseAction->setStatusTip(tr("Change the passphrase used for wallet encryption"));
	signMessageAction = new QAction(QIcon(":/icons/edit"), tr("Sign &message..."), this);
	signMessageAction->setStatusTip(tr("Sign messages with your Bitcoin addresses to prove you own them"));
	verifyMessageAction = new QAction(QIcon(":/icons/transaction_0"), tr("&Verify message..."), this);
	verifyMessageAction->setStatusTip(tr("Verify messages to ensure they were signed with specified Bitcoin addresses"));

	exportAction = new QAction(QIcon(":/icons/export"), tr("&Export..."), this);
	exportAction->setStatusTip(tr("Export the data in the current tab to a file"));
	exportAction->setToolTip(exportAction->statusTip());
	openRPCConsoleAction = new QAction(QIcon(":/icons/debugwindow"), tr("&Debug window"), this);
	openRPCConsoleAction->setStatusTip(tr("Open debugging and diagnostic console"));

	connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
	connect(aboutAction, SIGNAL(triggered()), this, SLOT(aboutClicked()));
	connect(aboutQtAction, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
	connect(optionsAction, SIGNAL(triggered()), this, SLOT(optionsClicked()));
	connect(toggleHideAction, SIGNAL(triggered()), this, SLOT(toggleHidden()));
	connect(encryptWalletAction, SIGNAL(triggered(bool)), this, SLOT(encryptWallet(bool)));
	connect(backupWalletAction, SIGNAL(triggered()), this, SLOT(backupWallet()));
	connect(changePassphraseAction, SIGNAL(triggered()), this, SLOT(changePassphrase()));
	connect(signMessageAction, SIGNAL(triggered()), this, SLOT(gotoSignMessageTab()));
	connect(verifyMessageAction, SIGNAL(triggered()), this, SLOT(gotoVerifyMessageTab()));
	}

	void BitcoinGUI::createMenuBar()
	{
	#ifdef Q_OS_MAC
	// Create a decoupled menu bar on Mac which stays even if the window is closed
	appMenuBar = new QMenuBar();
	#else
	// Get the main window's menu bar on other platforms
	appMenuBar = menuBar();
	#endif

	// Configure the menus
	QMenu *file = appMenuBar->addMenu(tr("&File"));
	file->addAction(backupWalletAction);
	file->addAction(exportAction);
	file->addAction(signMessageAction);
	file->addAction(verifyMessageAction);
	file->addSeparator();
	file->addAction(quitAction);

	QMenu *settings = appMenuBar->addMenu(tr("&Settings"));
	settings->addAction(encryptWalletAction);
	settings->addAction(changePassphraseAction);
	settings->addSeparator();
	settings->addAction(optionsAction);

	QMenu *help = appMenuBar->addMenu(tr("&Help"));
	help->addAction(openRPCConsoleAction);
	help->addSeparator();
	help->addAction(aboutAction);
	help->addAction(aboutQtAction);
	}

	void BitcoinGUI::createToolBars()
	{
	QToolBar *toolbar = addToolBar(tr("Tabs toolbar"));
	toolbar->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
	toolbar->addAction(overviewAction);
	toolbar->addAction(sendCoinsAction);
	toolbar->addAction(receiveCoinsAction);
	toolbar->addAction(historyAction);
	toolbar->addAction(addressBookAction);

	QToolBar *toolbar2 = addToolBar(tr("Actions toolbar"));
	toolbar2->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
	toolbar2->addAction(exportAction);
	}

	void BitcoinGUI::setClientModel(ClientModel *clientModel)
	{
	this->clientModel = clientModel;
	if(clientModel)
	{
	// Replace some strings and icons, when using the testnet
	if(clientModel->isTestNet())
	{
	setWindowTitle(windowTitle() + QString(" ") + tr("[testnet]"));
	#ifndef Q_OS_MAC
	qApp->setWindowIcon(QIcon(":icons/bitcoin_testnet"));
	setWindowIcon(QIcon(":icons/bitcoin_testnet"));
	#else
	MacDockIconHandler::instance()->setIcon(QIcon(":icons/bitcoin_testnet"));
	#endif
	if(trayIcon)
	{
	// Just attach " [testnet]" to the existing tooltip
	trayIcon->setToolTip(trayIcon->toolTip() + QString(" ") + tr("[testnet]"));
	trayIcon->setIcon(QIcon(":/icons/toolbar_testnet"));
	}

	toggleHideAction->setIcon(QIcon(":/icons/toolbar_testnet"));
	aboutAction->setIcon(QIcon(":/icons/toolbar_testnet"));
	}

	// Create system tray menu (or setup the dock menu) that late to prevent users from calling actions,
	// while the client has not yet fully loaded
	if(trayIcon)
	createTrayIconMenu();

	// Keep up to date with client
	setNumConnections(clientModel->getNumConnections());
	connect(clientModel, SIGNAL(numConnectionsChanged(int)), this, SLOT(setNumConnections(int)));

	setNumBlocks(clientModel->getNumBlocks(), clientModel->getNumBlocksOfPeers());
	connect(clientModel, SIGNAL(numBlocksChanged(int,int)), this, SLOT(setNumBlocks(int,int)));

	// Receive and report messages from network/worker thread
	connect(clientModel, SIGNAL(message(QString,QString,unsigned int)), this, SLOT(message(QString,QString,unsigned int)));

	overviewPage->setClientModel(clientModel);
	rpcConsole->setClientModel(clientModel);
	addressBookPage->setOptionsModel(clientModel->getOptionsModel());
	receiveCoinsPage->setOptionsModel(clientModel->getOptionsModel());
	}
	}

	void BitcoinGUI::setWalletModel(WalletModel *walletModel)
	{
	this->walletModel = walletModel;
	if(walletModel)
	{
	// Receive and report messages from wallet thread
	connect(walletModel, SIGNAL(message(QString,QString,unsigned int)), this, SLOT(message(QString,QString,unsigned int)));

	// Put transaction list in tabs
	transactionView->setModel(walletModel);
	overviewPage->setWalletModel(walletModel);
	addressBookPage->setModel(walletModel->getAddressTableModel());
	receiveCoinsPage->setModel(walletModel->getAddressTableModel());
	sendCoinsPage->setModel(walletModel);
	signVerifyMessageDialog->setModel(walletModel);

	setEncryptionStatus(walletModel->getEncryptionStatus());
	connect(walletModel, SIGNAL(encryptionStatusChanged(int)), this, SLOT(setEncryptionStatus(int)));

	// Balloon pop-up for new transaction
	connect(walletModel->getTransactionTableModel(), SIGNAL(rowsInserted(QModelIndex,int,int)),
	this, SLOT(incomingTransaction(QModelIndex,int,int)));

	// Ask for passphrase if needed
	connect(walletModel, SIGNAL(requireUnlock()), this, SLOT(unlockWallet()));
	}
	}

	void BitcoinGUI::createTrayIcon()
	{
	#ifndef Q_OS_MAC
	trayIcon = new QSystemTrayIcon(this);

	trayIcon->setToolTip(tr("Bitcoin client"));
	trayIcon->setIcon(QIcon(":/icons/toolbar"));
	trayIcon->show();
	#endif

	notificator = new Notificator(qApp->applicationName(), trayIcon);
	}

	void BitcoinGUI::createTrayIconMenu()
	{
	QMenu *trayIconMenu;
	#ifndef Q_OS_MAC
	trayIconMenu = new QMenu(this);
	trayIcon->setContextMenu(trayIconMenu);

	connect(trayIcon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)),
	this, SLOT(trayIconActivated(QSystemTrayIcon::ActivationReason)));
	#else
	// Note: On Mac, the dock icon is used to provide the tray's functionality.
	MacDockIconHandler *dockIconHandler = MacDockIconHandler::instance();
	trayIconMenu = dockIconHandler->dockMenu();
	#endif

	// Configuration of the tray icon (or dock icon) icon menu
	trayIconMenu->addAction(toggleHideAction);
	trayIconMenu->addSeparator();
	trayIconMenu->addAction(sendCoinsAction);
	trayIconMenu->addAction(receiveCoinsAction);
	trayIconMenu->addSeparator();
	trayIconMenu->addAction(signMessageAction);
	trayIconMenu->addAction(verifyMessageAction);
	trayIconMenu->addSeparator();
	trayIconMenu->addAction(optionsAction);
	trayIconMenu->addAction(openRPCConsoleAction);
	#ifndef Q_OS_MAC // This is built-in on Mac
	trayIconMenu->addSeparator();
	trayIconMenu->addAction(quitAction);
	#endif
	}

	#ifndef Q_OS_MAC
	void BitcoinGUI::trayIconActivated(QSystemTrayIcon::ActivationReason reason)
	{
	if(reason == QSystemTrayIcon::Trigger)
	{
	// Click on system tray icon triggers show/hide of the main window
	toggleHideAction->trigger();
	}
	}
	#endif

	void BitcoinGUI::optionsClicked()
	{
	if(!clientModel \|\| !clientModel->getOptionsModel())
	return;
	OptionsDialog dlg;
	dlg.setModel(clientModel->getOptionsModel());
	dlg.exec();
	}

	void BitcoinGUI::aboutClicked()
	{
	AboutDialog dlg;
	dlg.setModel(clientModel);
	dlg.exec();
	}

	void BitcoinGUI::setNumConnections(int count)
	{
	QString icon;
	switch(count)
	{
	case 0: icon = ":/icons/connect_0"; break;
	case 1: case 2: case 3: icon = ":/icons/connect_1"; break;
	case 4: case 5: case 6: icon = ":/icons/connect_2"; break;
	case 7: case 8: case 9: icon = ":/icons/connect_3"; break;
	default: icon = ":/icons/connect_4"; break;
	}
	labelConnectionsIcon->setPixmap(QIcon(icon).pixmap(STATUSBAR_ICONSIZE,STATUSBAR_ICONSIZE));
	labelConnectionsIcon->setToolTip(tr("%n active connection(s) to Bitcoin network", "", count));
	}

	void BitcoinGUI::setNumBlocks(int count, int nTotalBlocks)
	{
	// Prevent orphan statusbar messages (e.g. hover Quit in main menu, wait until chain-sync starts -> garbelled text)
	statusBar()->clearMessage();

	// don't show / hide progress bar and its label if we have no connection to the network
	enum BlockSource blockSource = clientModel ? clientModel->getBlockSource() : BLOCK_SOURCE_NONE;
	if (blockSource == BLOCK_SOURCE_NONE \|\| (blockSource == BLOCK_SOURCE_NETWORK && clientModel->getNumConnections() == 0))
	{
	progressBarLabel->setVisible(false);
	progressBar->setVisible(false);

	return;
	}

	QString tooltip;

	QString importText;
	switch (blockSource) {
	case BLOCK_SOURCE_NONE:
	case BLOCK_SOURCE_NETWORK:
	importText = tr("Synchronizing with network...");
	break;
	case BLOCK_SOURCE_DISK:
	importText = tr("Importing blocks from disk...");
	break;
	case BLOCK_SOURCE_REINDEX:
	importText = tr("Reindexing blocks on disk...");
	}

	if(count < nTotalBlocks)
	{
	int nRemainingBlocks = nTotalBlocks - count;
	float nPercentageDone = count / (nTotalBlocks * 0.01f);

	progressBarLabel->setText(importText);
	progressBarLabel->setVisible(true);
	progressBar->setFormat(tr("~%n block(s) remaining", "", nRemainingBlocks));
	progressBar->setMaximum(nTotalBlocks);
	progressBar->setValue(count);
	progressBar->setVisible(true);

	tooltip = tr("Processed %1 of %2 blocks of transaction history (%3% done).").arg(count).arg(nTotalBlocks).arg(nPercentageDone, 0, 'f', 2);
	}
	else
	{
	progressBarLabel->setVisible(false);

	progressBar->setVisible(false);
	tooltip = tr("Processed %1 blocks of transaction history.").arg(count);
	}

	QDateTime lastBlockDate = clientModel->getLastBlockDate();
	int secs = lastBlockDate.secsTo(QDateTime::currentDateTime());
	QString text;

	// Represent time from last generated block in human readable text
	if(secs <= 0)
	{
	// Fully up to date. Leave text empty.
	}
	else if(secs < 60)
	{
	text = tr("%n second(s) ago","",secs);
	}
	else if(secs < 60*60)
	{
	text = tr("%n minute(s) ago","",secs/60);
	}
	else if(secs < 246060)
	{
	text = tr("%n hour(s) ago","",secs/(60*60));
	}
	else
	{
	text = tr("%n day(s) ago","",secs/(606024));
	}

	// Set icon state: spinning if catching up, tick otherwise
	if(secs < 90*60 && count >= nTotalBlocks)
	{
	tooltip = tr("Up to date") + QString(".<br>") + tooltip;
	labelBlocksIcon->setPixmap(QIcon(":/icons/synced").pixmap(STATUSBAR_ICONSIZE, STATUSBAR_ICONSIZE));

	overviewPage->showOutOfSyncWarning(false);
	}
	else
	{
	tooltip = tr("Catching up...") + QString("<br>") + tooltip;
	labelBlocksIcon->setMovie(syncIconMovie);
	syncIconMovie->start();

	overviewPage->showOutOfSyncWarning(true);
	}

	if(!text.isEmpty())
	{
	tooltip += QString("<br>");
	tooltip += tr("Last received block was generated %1.").arg(text);
	}

	// Don't word-wrap this (fixed-width) tooltip
	tooltip = QString("<nobr>") + tooltip + QString("</nobr>");

	labelBlocksIcon->setToolTip(tooltip);
	progressBarLabel->setToolTip(tooltip);
	progressBar->setToolTip(tooltip);
	}

	void BitcoinGUI::message(const QString &title, const QString &message, unsigned int style)
	{
	QString strTitle = tr("Bitcoin") + " - ";
	// Default to information icon
	int nMBoxIcon = QMessageBox::Information;
	int nNotifyIcon = Notificator::Information;

	// Check for usage of predefined title
	switch (style) {
	case CClientUIInterface::MSG_ERROR:
	strTitle += tr("Error");
	break;
	case CClientUIInterface::MSG_WARNING:
	strTitle += tr("Warning");
	break;
	case CClientUIInterface::MSG_INFORMATION:
	strTitle += tr("Information");
	break;
	default:
	strTitle += title; // Use supplied title
	}

	// Check for error/warning icon
	if (style & CClientUIInterface::ICON_ERROR) {
	nMBoxIcon = QMessageBox::Critical;
	nNotifyIcon = Notificator::Critical;
	}
	else if (style & CClientUIInterface::ICON_WARNING) {
	nMBoxIcon = QMessageBox::Warning;
	nNotifyIcon = Notificator::Warning;
	}

	// Display message
	if (style & CClientUIInterface::MODAL) {
	// Check for buttons, use OK as default, if none was supplied
	QMessageBox::StandardButton buttons;
	if (!(buttons = (QMessageBox::StandardButton)(style & CClientUIInterface::BTN_MASK)))
	buttons = QMessageBox::Ok;

	QMessageBox mBox((QMessageBox::Icon)nMBoxIcon, strTitle, message, buttons);
	mBox.exec();
	}
	else
	notificator->notify((Notificator::Class)nNotifyIcon, strTitle, message);
	}

	void BitcoinGUI::changeEvent(QEvent *e)
	{
	QMainWindow::changeEvent(e);
	#ifndef Q_OS_MAC // Ignored on Mac
	if(e->type() == QEvent::WindowStateChange)
	{
	if(clientModel && clientModel->getOptionsModel()->getMinimizeToTray())
	{
	QWindowStateChangeEvent wsevt = static_cast<QWindowStateChangeEvent>(e);
	if(!(wsevt->oldState() & Qt::WindowMinimized) && isMinimized())
	{
	QTimer::singleShot(0, this, SLOT(hide()));
	e->ignore();
	}
	}
	}
	#endif
	}

	void BitcoinGUI::closeEvent(QCloseEvent *event)
	{
	if(clientModel)
	{
	#ifndef Q_OS_MAC // Ignored on Mac
	if(!clientModel->getOptionsModel()->getMinimizeToTray() &&
	!clientModel->getOptionsModel()->getMinimizeOnClose())
	{
	qApp->quit();
	}
	#endif
	}
	QMainWindow::closeEvent(event);
	}

	void BitcoinGUI::askFee(qint64 nFeeRequired, bool *payFee)
	{
	QString strMessage = tr("This transaction is over the size limit. You can still send it for a fee of %1, "
	"which goes to the nodes that process your transaction and helps to support the network. "
	"Do you want to pay the fee?").arg(BitcoinUnits::formatWithUnit(BitcoinUnits::BTC, nFeeRequired));
	QMessageBox::StandardButton retval = QMessageBox::question(
	this, tr("Confirm transaction fee"), strMessage,
	QMessageBox::Yes\|QMessageBox::Cancel, QMessageBox::Yes);
	*payFee = (retval == QMessageBox::Yes);
	}

	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();
	if(!clientModel->inInitialBlockDownload())
	{
	// On new transaction, make an info balloon
	// Unless the initial block download is in progress, to prevent balloon-spam
	QString date = ttm->index(start, TransactionTableModel::Date, parent)
	.data().toString();
	QString type = ttm->index(start, TransactionTableModel::Type, parent)
	.data().toString();
	QString address = ttm->index(start, TransactionTableModel::ToAddress, parent)
	.data().toString();
	QIcon icon = qvariant_cast<QIcon>(ttm->index(start,
	TransactionTableModel::ToAddress, parent)
	.data(Qt::DecorationRole));

	notificator->notify(Notificator::Information,
	(amount)<0 ? tr("Sent transaction") :
	tr("Incoming transaction"),
	tr("Date: %1\n"
	"Amount: %2\n"
	"Type: %3\n"
	"Address: %4\n")
	.arg(date)
	.arg(BitcoinUnits::formatWithUnit(walletModel->getOptionsModel()->getDisplayUnit(), amount, true))
	.arg(type)
	.arg(address), icon);
	}
	}

	void BitcoinGUI::gotoOverviewPage()
	{
	overviewAction->setChecked(true);
	centralWidget->setCurrentWidget(overviewPage);

	exportAction->setEnabled(false);
	disconnect(exportAction, SIGNAL(triggered()), 0, 0);
	}

	void BitcoinGUI::gotoHistoryPage()
	{
	historyAction->setChecked(true);
	centralWidget->setCurrentWidget(transactionsPage);

	exportAction->setEnabled(true);
	disconnect(exportAction, SIGNAL(triggered()), 0, 0);
	connect(exportAction, SIGNAL(triggered()), transactionView, SLOT(exportClicked()));
	}

	void BitcoinGUI::gotoAddressBookPage()
	{
	addressBookAction->setChecked(true);
	centralWidget->setCurrentWidget(addressBookPage);

	exportAction->setEnabled(true);
	disconnect(exportAction, SIGNAL(triggered()), 0, 0);
	connect(exportAction, SIGNAL(triggered()), addressBookPage, SLOT(exportClicked()));
	}

	void BitcoinGUI::gotoReceiveCoinsPage()
	{
	receiveCoinsAction->setChecked(true);
	centralWidget->setCurrentWidget(receiveCoinsPage);

	exportAction->setEnabled(true);
	disconnect(exportAction, SIGNAL(triggered()), 0, 0);
	connect(exportAction, SIGNAL(triggered()), receiveCoinsPage, SLOT(exportClicked()));
	}

	void BitcoinGUI::gotoSendCoinsPage()
	{
	sendCoinsAction->setChecked(true);
	centralWidget->setCurrentWidget(sendCoinsPage);

	exportAction->setEnabled(false);
	disconnect(exportAction, SIGNAL(triggered()), 0, 0);
	}

	void BitcoinGUI::gotoSignMessageTab(QString addr)
	{
	// call show() in showTab_SM()
	signVerifyMessageDialog->showTab_SM(true);

	if(!addr.isEmpty())
	signVerifyMessageDialog->setAddress_SM(addr);
	}

	void BitcoinGUI::gotoVerifyMessageTab(QString addr)
	{
	// call show() in showTab_VM()
	signVerifyMessageDialog->showTab_VM(true);

	if(!addr.isEmpty())
	signVerifyMessageDialog->setAddress_VM(addr);
	}

	void BitcoinGUI::dragEnterEvent(QDragEnterEvent *event)
	{
	// Accept only URIs
	if(event->mimeData()->hasUrls())
	event->acceptProposedAction();
	}

	void BitcoinGUI::dropEvent(QDropEvent *event)
	{
	if(event->mimeData()->hasUrls())
	{
	int nValidUrisFound = 0;
	QList<QUrl> uris = event->mimeData()->urls();
	foreach(const QUrl &uri, uris)
	{
	if (sendCoinsPage->handleURI(uri.toString()))
	nValidUrisFound++;
	}

	// if valid URIs were found
	if (nValidUrisFound)
	gotoSendCoinsPage();
	else
	notificator->notify(Notificator::Warning, tr("URI handling"), tr("URI can not be parsed! This can be caused by an invalid Bitcoin address or malformed URI parameters."));
	}

	event->acceptProposedAction();
	}

	bool BitcoinGUI::eventFilter(QObject object, QEvent event)
	{
	// Catch status tip events
	if (event->type() == QEvent::StatusTip)
	{
	// Prevent adding text from setStatusTip(), if we currently use the status bar for displaying other stuff
	if (progressBarLabel->isVisible() && progressBar->isVisible())
	return true;
	}
	return QMainWindow::eventFilter(object, event);
	}

	void BitcoinGUI::handleURI(QString strURI)
	{
	// URI has to be valid
	if (sendCoinsPage->handleURI(strURI))
	{
	showNormalIfMinimized();
	gotoSendCoinsPage();
	}
	else
	notificator->notify(Notificator::Warning, tr("URI handling"), tr("URI can not be parsed! This can be caused by an invalid Bitcoin address or malformed URI parameters."));
	}

	void BitcoinGUI::setEncryptionStatus(int status)
	{
	switch(status)
	{
	case WalletModel::Unencrypted:
	labelEncryptionIcon->hide();
	encryptWalletAction->setChecked(false);
	changePassphraseAction->setEnabled(false);
	encryptWalletAction->setEnabled(true);
	break;
	case WalletModel::Unlocked:
	labelEncryptionIcon->show();
	labelEncryptionIcon->setPixmap(QIcon(":/icons/lock_open").pixmap(STATUSBAR_ICONSIZE,STATUSBAR_ICONSIZE));
	labelEncryptionIcon->setToolTip(tr("Wallet is <b>encrypted</b> and currently <b>unlocked</b>"));
	encryptWalletAction->setChecked(true);
	changePassphraseAction->setEnabled(true);
	encryptWalletAction->setEnabled(false); // TODO: decrypt currently not supported
	break;
	case WalletModel::Locked:
	labelEncryptionIcon->show();
	labelEncryptionIcon->setPixmap(QIcon(":/icons/lock_closed").pixmap(STATUSBAR_ICONSIZE,STATUSBAR_ICONSIZE));
	labelEncryptionIcon->setToolTip(tr("Wallet is <b>encrypted</b> and currently <b>locked</b>"));
	encryptWalletAction->setChecked(true);
	changePassphraseAction->setEnabled(true);
	encryptWalletAction->setEnabled(false); // TODO: decrypt currently not supported
	break;
	}
	}

	void BitcoinGUI::encryptWallet(bool status)
	{
	if(!walletModel)
	return;
	AskPassphraseDialog dlg(status ? AskPassphraseDialog::Encrypt:
	AskPassphraseDialog::Decrypt, this);
	dlg.setModel(walletModel);
	dlg.exec();

	setEncryptionStatus(walletModel->getEncryptionStatus());
	}

	void BitcoinGUI::backupWallet()
	{
	QString saveDir = QDesktopServices::storageLocation(QDesktopServices::DocumentsLocation);
	QString filename = QFileDialog::getSaveFileName(this, tr("Backup Wallet"), saveDir, tr("Wallet Data (*.dat)"));
	if(!filename.isEmpty()) {
	if(!walletModel->backupWallet(filename)) {
	QMessageBox::warning(this, tr("Backup Failed"), tr("There was an error trying to save the wallet data to the new location."));
	}
	}
	}

	void BitcoinGUI::changePassphrase()
	{
	AskPassphraseDialog dlg(AskPassphraseDialog::ChangePass, this);
	dlg.setModel(walletModel);
	dlg.exec();
	}

	void BitcoinGUI::unlockWallet()
	{
	if(!walletModel)
	return;
	// Unlock wallet when requested by wallet model
	if(walletModel->getEncryptionStatus() == WalletModel::Locked)
	{
	AskPassphraseDialog dlg(AskPassphraseDialog::Unlock, this);
	dlg.setModel(walletModel);
	dlg.exec();
	}
	}

	void BitcoinGUI::showNormalIfMinimized(bool fToggleHidden)
	{
	// activateWindow() (sometimes) helps with keyboard focus on Windows
	if (isHidden())
	{
	show();
	activateWindow();
	}
	else if (isMinimized())
	{
	showNormal();
	activateWindow();
	}
	else if (GUIUtil::isObscured(this))
	{
	raise();
	activateWindow();
	}
	else if(fToggleHidden)
	hide();
	}

	void BitcoinGUI::toggleHidden()
	{
	showNormalIfMinimized(true);
	}

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