guiutil.cpp

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// Copyright (c) 2011-2013 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include "guiutil.h"

#include "bitcoinaddressvalidator.h"
#include "bitcoinunits.h"
#include "qvalidatedlineedit.h"
#include "walletmodel.h"

#include "core.h"
#include "init.h"
#include "util.h"

#ifdef WIN32
#ifdef _WIN32_WINNT
#undef _WIN32_WINNT
#endif
#define _WIN32_WINNT 0x0501
#ifdef _WIN32_IE
#undef _WIN32_IE
#endif
#define _WIN32_IE 0x0501
#define WIN32_LEAN_AND_MEAN 1
#ifndef NOMINMAX
#define NOMINMAX
#endif
#include "shellapi.h"
#include "shlobj.h"
#include "shlwapi.h"
#endif

#include <boost/filesystem.hpp>
#include <boost/filesystem/fstream.hpp>
#if BOOST_FILESYSTEM_VERSION >= 3
#include <boost/filesystem/detail/utf8_codecvt_facet.hpp>
#endif

#include <QAbstractItemView>
#include <QApplication>
#include <QClipboard>
#include <QDateTime>
#include <QDesktopServices>
#include <QDesktopWidget>
#include <QDoubleValidator>
#include <QFileDialog>
#include <QFont>
#include <QLineEdit>
#include <QSettings>
#include <QTextDocument> // for Qt::mightBeRichText
#include <QThread>

#if QT_VERSION < 0x050000
#include <QUrl>
#else
#include <QUrlQuery>
#endif

#if BOOST_FILESYSTEM_VERSION >= 3
static boost::filesystem::detail::utf8_codecvt_facet utf8;
#endif

#if defined(Q_OS_MAC)
extern double NSAppKitVersionNumber;
#if !defined(NSAppKitVersionNumber10_9)
#define NSAppKitVersionNumber10_9 1265
#endif
#endif

namespace GUIUtil {

QString dateTimeStr(const QDateTime &date)
{
    return date.date().toString(Qt::SystemLocaleShortDate) + QString(" ") + date.toString("hh:mm");
}

QString dateTimeStr(qint64 nTime)
{
    return dateTimeStr(QDateTime::fromTime_t((qint32)nTime));
}

QFont bitcoinAddressFont()
{
    QFont font("Monospace");
#if QT_VERSION >= 0x040800
    font.setStyleHint(QFont::Monospace);
#else
    font.setStyleHint(QFont::TypeWriter);
#endif
    return font;
}

void setupAddressWidget(QValidatedLineEdit *widget, QWidget *parent)
{
    parent->setFocusProxy(widget);

    widget->setFont(bitcoinAddressFont());
#if QT_VERSION >= 0x040700
    widget->setPlaceholderText(QObject::tr("Enter a Bitcoin address (e.g. 1NS17iag9jJgTHD1VXjvLCEnZuQ3rJDE9L)"));
#endif
    widget->setValidator(new BitcoinAddressEntryValidator(parent));
    widget->setCheckValidator(new BitcoinAddressCheckValidator(parent));
}

void setupAmountWidget(QLineEdit *widget, QWidget *parent)
{
    QDoubleValidator *amountValidator = new QDoubleValidator(parent);
    amountValidator->setDecimals(8);
    amountValidator->setBottom(0.0);
    widget->setValidator(amountValidator);
    widget->setAlignment(Qt::AlignRight|Qt::AlignVCenter);
}

bool parseBitcoinURI(const QUrl &uri, SendCoinsRecipient *out)
{
    // return if URI is not valid or is no bitcoin: URI
    if(!uri.isValid() || uri.scheme() != QString("bitcoin"))
        return false;

    SendCoinsRecipient rv;
    rv.address = uri.path();
    rv.amount = 0;

#if QT_VERSION < 0x050000
    QList<QPair<QString, QString> > items = uri.queryItems();
#else
    QUrlQuery uriQuery(uri);
    QList<QPair<QString, QString> > items = uriQuery.queryItems();
#endif
    for (QList<QPair<QString, QString> >::iterator i = items.begin(); i != items.end(); i++)
    {
        bool fShouldReturnFalse = false;
        if (i->first.startsWith("req-"))
        {
            i->first.remove(0, 4);
            fShouldReturnFalse = true;
        }

        if (i->first == "label")
        {
            rv.label = i->second;
            fShouldReturnFalse = false;
        }
        if (i->first == "message")
        {
            rv.message = i->second;
            fShouldReturnFalse = false;
        }
        else if (i->first == "amount")
        {
            if(!i->second.isEmpty())
            {
                if(!BitcoinUnits::parse(BitcoinUnits::BTC, i->second, &rv.amount))
                {
                    return false;
                }
            }
            fShouldReturnFalse = false;
        }

        if (fShouldReturnFalse)
            return false;
    }
    if(out)
    {
        *out = rv;
    }
    return true;
}

bool parseBitcoinURI(QString uri, SendCoinsRecipient *out)
{
    // Convert bitcoin:// to bitcoin:
    //
    //    Cannot handle this later, because bitcoin:// will cause Qt to see the part after // as host,
    //    which will lower-case it (and thus invalidate the address).
    if(uri.startsWith("bitcoin://", Qt::CaseInsensitive))
    {
        uri.replace(0, 10, "bitcoin:");
    }
    QUrl uriInstance(uri);
    return parseBitcoinURI(uriInstance, out);
}

QString formatBitcoinURI(const SendCoinsRecipient &info)
{
    QString ret = QString("bitcoin:%1").arg(info.address);
    int paramCount = 0;

    if (info.amount)
    {
        ret += QString("?amount=%1").arg(BitcoinUnits::format(BitcoinUnits::BTC, info.amount));
        paramCount++;
    }

    if (!info.label.isEmpty())
    {
        QString lbl(QUrl::toPercentEncoding(info.label));
        ret += QString("%1label=%2").arg(paramCount == 0 ? "?" : "&").arg(lbl);
        paramCount++;
    }

    if (!info.message.isEmpty())
    {
        QString msg(QUrl::toPercentEncoding(info.message));;
        ret += QString("%1message=%2").arg(paramCount == 0 ? "?" : "&").arg(msg);
        paramCount++;
    }

    return ret;
}

bool isDust(const QString& address, qint64 amount)
{
    CTxDestination dest = CBitcoinAddress(address.toStdString()).Get();
    CScript script; script.SetDestination(dest);
    CTxOut txOut(amount, script);
    return txOut.IsDust(CTransaction::nMinRelayTxFee);
}

QString HtmlEscape(const QString& str, bool fMultiLine)
{
#if QT_VERSION < 0x050000
    QString escaped = Qt::escape(str);
#else
    QString escaped = str.toHtmlEscaped();
#endif
    if(fMultiLine)
    {
        escaped = escaped.replace("\n", "<br>\n");
    }
    return escaped;
}

QString HtmlEscape(const std::string& str, bool fMultiLine)
{
    return HtmlEscape(QString::fromStdString(str), fMultiLine);
}

void copyEntryData(QAbstractItemView *view, int column, int role)
{
    if(!view || !view->selectionModel())
        return;
    QModelIndexList selection = view->selectionModel()->selectedRows(column);

    if(!selection.isEmpty())
    {
        // Copy first item
        setClipboard(selection.at(0).data(role).toString());
    }
}

QString getSaveFileName(QWidget *parent, const QString &caption, const QString &dir,
    const QString &filter,
    QString *selectedSuffixOut)
{
    QString selectedFilter;
    QString myDir;
    if(dir.isEmpty()) // Default to user documents location
    {
#if QT_VERSION < 0x050000
        myDir = QDesktopServices::storageLocation(QDesktopServices::DocumentsLocation);
#else
        myDir = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
#endif
    }
    else
    {
        myDir = dir;
    }
    /* Directly convert path to native OS path separators */
    QString result = QDir::toNativeSeparators(QFileDialog::getSaveFileName(parent, caption, myDir, filter, &selectedFilter));

    /* Extract first suffix from filter pattern "Description (*.foo)" or "Description (*.foo *.bar ...) */
    QRegExp filter_re(".* \\(\\*\\.(.*)[ \\)]");
    QString selectedSuffix;
    if(filter_re.exactMatch(selectedFilter))
    {
        selectedSuffix = filter_re.cap(1);
    }

    /* Add suffix if needed */
    QFileInfo info(result);
    if(!result.isEmpty())
    {
        if(info.suffix().isEmpty() && !selectedSuffix.isEmpty())
        {
            /* No suffix specified, add selected suffix */
            if(!result.endsWith("."))
                result.append(".");
            result.append(selectedSuffix);
        }
    }

    /* Return selected suffix if asked to */
    if(selectedSuffixOut)
    {
        *selectedSuffixOut = selectedSuffix;
    }
    return result;
}

QString getOpenFileName(QWidget *parent, const QString &caption, const QString &dir,
    const QString &filter,
    QString *selectedSuffixOut)
{
    QString selectedFilter;
    QString myDir;
    if(dir.isEmpty()) // Default to user documents location
    {
#if QT_VERSION < 0x050000
        myDir = QDesktopServices::storageLocation(QDesktopServices::DocumentsLocation);
#else
        myDir = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
#endif
    }
    else
    {
        myDir = dir;
    }
    /* Directly convert path to native OS path separators */
    QString result = QDir::toNativeSeparators(QFileDialog::getOpenFileName(parent, caption, myDir, filter, &selectedFilter));

    if(selectedSuffixOut)
    {
        /* Extract first suffix from filter pattern "Description (*.foo)" or "Description (*.foo *.bar ...) */
        QRegExp filter_re(".* \\(\\*\\.(.*)[ \\)]");
        QString selectedSuffix;
        if(filter_re.exactMatch(selectedFilter))
        {
            selectedSuffix = filter_re.cap(1);
        }
        *selectedSuffixOut = selectedSuffix;
    }
    return result;
}

Qt::ConnectionType blockingGUIThreadConnection()
{
    if(QThread::currentThread() != qApp->thread())
    {
        return Qt::BlockingQueuedConnection;
    }
    else
    {
        return Qt::DirectConnection;
    }
}

bool checkPoint(const QPoint &p, const QWidget *w)
{
    QWidget *atW = QApplication::widgetAt(w->mapToGlobal(p));
    if (!atW) return false;
    return atW->topLevelWidget() == w;
}

bool isObscured(QWidget *w)
{
    return !(checkPoint(QPoint(0, 0), w)
        && checkPoint(QPoint(w->width() - 1, 0), w)
        && checkPoint(QPoint(0, w->height() - 1), w)
        && checkPoint(QPoint(w->width() - 1, w->height() - 1), w)
        && checkPoint(QPoint(w->width() / 2, w->height() / 2), w));
}

void openDebugLogfile()
{
    boost::filesystem::path pathDebug = GetDataDir() / "debug.log";

    /* Open debug.log with the associated application */
    if (boost::filesystem::exists(pathDebug))
        QDesktopServices::openUrl(QUrl::fromLocalFile(boostPathToQString(pathDebug)));
}

ToolTipToRichTextFilter::ToolTipToRichTextFilter(int size_threshold, QObject *parent) :
    QObject(parent), size_threshold(size_threshold)
{

}

void SubstituteFonts()
{
#if defined(Q_OS_MAC)
// Background:
// OSX's default font changed in 10.9 and QT is unable to find it with its
// usual fallback methods when building against the 10.7 sdk or lower.
// The 10.8 SDK added a function to let it find the correct fallback font.
// If this fallback is not properly loaded, some characters may fail to
// render correctly.
//
// Solution: If building with the 10.7 SDK or lower and the user's platform
// is 10.9 or higher at runtime, substitute the correct font. This needs to
// happen before the QApplication is created.
#if defined(MAC_OS_X_VERSION_MAX_ALLOWED) && MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_8
    if (floor(NSAppKitVersionNumber) >= NSAppKitVersionNumber10_9)
        QFont::insertSubstitution(".Lucida Grande UI", "Lucida Grande");
#endif
#endif
}

bool ToolTipToRichTextFilter::eventFilter(QObject *obj, QEvent *evt)
{
    if(evt->type() == QEvent::ToolTipChange)
    {
        QWidget *widget = static_cast<QWidget*>(obj);
        QString tooltip = widget->toolTip();
        if(tooltip.size() > size_threshold && !tooltip.startsWith("<qt") && !Qt::mightBeRichText(tooltip))
        {
            // Envelop with <qt></qt> to make sure Qt detects this as rich text
            // Escape the current message as HTML and replace \n by <br>
            tooltip = "<qt>" + HtmlEscape(tooltip, true) + "</qt>";
            widget->setToolTip(tooltip);
            return true;
        }
    }
    return QObject::eventFilter(obj, evt);
}

void TableViewLastColumnResizingFixer::connectViewHeadersSignals()
{
    connect(tableView->horizontalHeader(), SIGNAL(sectionResized(int,int,int)), this, SLOT(on_sectionResized(int,int,int)));
    connect(tableView->horizontalHeader(), SIGNAL(geometriesChanged()), this, SLOT(on_geometriesChanged()));
}

// We need to disconnect these while handling the resize events, otherwise we can enter infinite loops.
void TableViewLastColumnResizingFixer::disconnectViewHeadersSignals()
{
    disconnect(tableView->horizontalHeader(), SIGNAL(sectionResized(int,int,int)), this, SLOT(on_sectionResized(int,int,int)));
    disconnect(tableView->horizontalHeader(), SIGNAL(geometriesChanged()), this, SLOT(on_geometriesChanged()));
}

// Setup the resize mode, handles compatibility for Qt5 and below as the method signatures changed.
// Refactored here for readability.
void TableViewLastColumnResizingFixer::setViewHeaderResizeMode(int logicalIndex, QHeaderView::ResizeMode resizeMode)
{
#if QT_VERSION < 0x050000
    tableView->horizontalHeader()->setResizeMode(logicalIndex, resizeMode);
#else
    tableView->horizontalHeader()->setSectionResizeMode(logicalIndex, resizeMode);
#endif
}

void TableViewLastColumnResizingFixer::resizeColumn(int nColumnIndex, int width)
{
    tableView->setColumnWidth(nColumnIndex, width);
    tableView->horizontalHeader()->resizeSection(nColumnIndex, width);
}

int TableViewLastColumnResizingFixer::getColumnsWidth()
{
    int nColumnsWidthSum = 0;
    for (int i = 0; i < columnCount; i++)
    {
        nColumnsWidthSum += tableView->horizontalHeader()->sectionSize(i);
    }
    return nColumnsWidthSum;
}

int TableViewLastColumnResizingFixer::getAvailableWidthForColumn(int column)
{
    int nResult = lastColumnMinimumWidth;
    int nTableWidth = tableView->horizontalHeader()->width();

    if (nTableWidth > 0)
    {
        int nOtherColsWidth = getColumnsWidth() - tableView->horizontalHeader()->sectionSize(column);
        nResult = std::max(nResult, nTableWidth - nOtherColsWidth);
    }

    return nResult;
}

// Make sure we don't make the columns wider than the tables viewport width.
void TableViewLastColumnResizingFixer::adjustTableColumnsWidth()
{
    disconnectViewHeadersSignals();
    resizeColumn(lastColumnIndex, getAvailableWidthForColumn(lastColumnIndex));
    connectViewHeadersSignals();

    int nTableWidth = tableView->horizontalHeader()->width();
    int nColsWidth = getColumnsWidth();
    if (nColsWidth > nTableWidth)
    {
        resizeColumn(secondToLastColumnIndex,getAvailableWidthForColumn(secondToLastColumnIndex));
    }
}

// Make column use all the space available, useful during window resizing.
void TableViewLastColumnResizingFixer::stretchColumnWidth(int column)
{
    disconnectViewHeadersSignals();
    resizeColumn(column, getAvailableWidthForColumn(column));
    connectViewHeadersSignals();
}

// When a section is resized this is a slot-proxy for ajustAmountColumnWidth().
void TableViewLastColumnResizingFixer::on_sectionResized(int logicalIndex, int oldSize, int newSize)
{
    adjustTableColumnsWidth();
    int remainingWidth = getAvailableWidthForColumn(logicalIndex);
    if (newSize > remainingWidth)
    {
       resizeColumn(logicalIndex, remainingWidth);
    }
}

// When the tabless geometry is ready, we manually perform the stretch of the "Message" column,
// as the "Stretch" resize mode does not allow for interactive resizing.
void TableViewLastColumnResizingFixer::on_geometriesChanged()
{
    if ((getColumnsWidth() - this->tableView->horizontalHeader()->width()) != 0)
    {
        disconnectViewHeadersSignals();
        resizeColumn(secondToLastColumnIndex, getAvailableWidthForColumn(secondToLastColumnIndex));
        connectViewHeadersSignals();
    }
}

TableViewLastColumnResizingFixer::TableViewLastColumnResizingFixer(QTableView* table, int lastColMinimumWidth, int allColsMinimumWidth) :
    tableView(table),
    lastColumnMinimumWidth(lastColMinimumWidth),
    allColumnsMinimumWidth(allColsMinimumWidth)
{
    columnCount = tableView->horizontalHeader()->count();
    lastColumnIndex = columnCount - 1;
    secondToLastColumnIndex = columnCount - 2;
    tableView->horizontalHeader()->setMinimumSectionSize(allColumnsMinimumWidth);
    setViewHeaderResizeMode(secondToLastColumnIndex, QHeaderView::Interactive);
    setViewHeaderResizeMode(lastColumnIndex, QHeaderView::Interactive);
}

#ifdef WIN32
boost::filesystem::path static StartupShortcutPath()
{
    return GetSpecialFolderPath(CSIDL_STARTUP) / "Bitcoin.lnk";
}

bool GetStartOnSystemStartup()
{
    // check for Bitcoin.lnk
    return boost::filesystem::exists(StartupShortcutPath());
}

bool SetStartOnSystemStartup(bool fAutoStart)
{
    // If the shortcut exists already, remove it for updating
    boost::filesystem::remove(StartupShortcutPath());

    if (fAutoStart)
    {
        CoInitialize(NULL);

        // Get a pointer to the IShellLink interface.
        IShellLink* psl = NULL;
        HRESULT hres = CoCreateInstance(CLSID_ShellLink, NULL,
                                CLSCTX_INPROC_SERVER, IID_IShellLink,
                                reinterpret_cast<void**>(&psl));

        if (SUCCEEDED(hres))
        {
            // Get the current executable path
            TCHAR pszExePath[MAX_PATH];
            GetModuleFileName(NULL, pszExePath, sizeof(pszExePath));

            TCHAR pszArgs[5] = TEXT("-min");

            // Set the path to the shortcut target
            psl->SetPath(pszExePath);
            PathRemoveFileSpec(pszExePath);
            psl->SetWorkingDirectory(pszExePath);
            psl->SetShowCmd(SW_SHOWMINNOACTIVE);
            psl->SetArguments(pszArgs);

            // Query IShellLink for the IPersistFile interface for
            // saving the shortcut in persistent storage.
            IPersistFile* ppf = NULL;
            hres = psl->QueryInterface(IID_IPersistFile,
                                       reinterpret_cast<void**>(&ppf));
            if (SUCCEEDED(hres))
            {
                WCHAR pwsz[MAX_PATH];
                // Ensure that the string is ANSI.
                MultiByteToWideChar(CP_ACP, 0, StartupShortcutPath().string().c_str(), -1, pwsz, MAX_PATH);
                // Save the link by calling IPersistFile::Save.
                hres = ppf->Save(pwsz, TRUE);
                ppf->Release();
                psl->Release();
                CoUninitialize();
                return true;
            }
            psl->Release();
        }
        CoUninitialize();
        return false;
    }
    return true;
}

#elif defined(Q_OS_LINUX)

// Follow the Desktop Application Autostart Spec:
//  http://standards.freedesktop.org/autostart-spec/autostart-spec-latest.html

boost::filesystem::path static GetAutostartDir()
{
    namespace fs = boost::filesystem;

    char* pszConfigHome = getenv("XDG_CONFIG_HOME");
    if (pszConfigHome) return fs::path(pszConfigHome) / "autostart";
    char* pszHome = getenv("HOME");
    if (pszHome) return fs::path(pszHome) / ".config" / "autostart";
    return fs::path();
}

boost::filesystem::path static GetAutostartFilePath()
{
    return GetAutostartDir() / "bitcoin.desktop";
}

bool GetStartOnSystemStartup()
{
    boost::filesystem::ifstream optionFile(GetAutostartFilePath());
    if (!optionFile.good())
        return false;
    // Scan through file for "Hidden=true":
    std::string line;
    while (!optionFile.eof())
    {
        getline(optionFile, line);
        if (line.find("Hidden") != std::string::npos &&
            line.find("true") != std::string::npos)
            return false;
    }
    optionFile.close();

    return true;
}

bool SetStartOnSystemStartup(bool fAutoStart)
{
    if (!fAutoStart)
        boost::filesystem::remove(GetAutostartFilePath());
    else
    {
        char pszExePath[MAX_PATH+1];
        memset(pszExePath, 0, sizeof(pszExePath));
        if (readlink("/proc/self/exe", pszExePath, sizeof(pszExePath)-1) == -1)
            return false;

        boost::filesystem::create_directories(GetAutostartDir());

        boost::filesystem::ofstream optionFile(GetAutostartFilePath(), std::ios_base::out|std::ios_base::trunc);
        if (!optionFile.good())
            return false;
        // Write a bitcoin.desktop file to the autostart directory:
        optionFile << "[Desktop Entry]\n";
        optionFile << "Type=Application\n";
        optionFile << "Name=Bitcoin\n";
        optionFile << "Exec=" << pszExePath << " -min\n";
        optionFile << "Terminal=false\n";
        optionFile << "Hidden=false\n";
        optionFile.close();
    }
    return true;
}


#elif defined(Q_OS_MAC)
// based on: https://github.com/Mozketo/LaunchAtLoginController/blob/master/LaunchAtLoginController.m

#include <CoreFoundation/CoreFoundation.h>
#include <CoreServices/CoreServices.h>

LSSharedFileListItemRef findStartupItemInList(LSSharedFileListRef list, CFURLRef findUrl);
LSSharedFileListItemRef findStartupItemInList(LSSharedFileListRef list, CFURLRef findUrl)
{
    // loop through the list of startup items and try to find the bitcoin app
    CFArrayRef listSnapshot = LSSharedFileListCopySnapshot(list, NULL);
    for(int i = 0; i < CFArrayGetCount(listSnapshot); i++) {
        LSSharedFileListItemRef item = (LSSharedFileListItemRef)CFArrayGetValueAtIndex(listSnapshot, i);
        UInt32 resolutionFlags = kLSSharedFileListNoUserInteraction | kLSSharedFileListDoNotMountVolumes;
        CFURLRef currentItemURL = NULL;
        LSSharedFileListItemResolve(item, resolutionFlags, &currentItemURL, NULL);
        if(currentItemURL && CFEqual(currentItemURL, findUrl)) {
            // found
            CFRelease(currentItemURL);
            return item;
        }
        if(currentItemURL) {
            CFRelease(currentItemURL);
        }
    }
    return NULL;
}

bool GetStartOnSystemStartup()
{
    CFURLRef bitcoinAppUrl = CFBundleCopyBundleURL(CFBundleGetMainBundle());
    LSSharedFileListRef loginItems = LSSharedFileListCreate(NULL, kLSSharedFileListSessionLoginItems, NULL);
    LSSharedFileListItemRef foundItem = findStartupItemInList(loginItems, bitcoinAppUrl);
    return !!foundItem; // return boolified object
}

bool SetStartOnSystemStartup(bool fAutoStart)
{
    CFURLRef bitcoinAppUrl = CFBundleCopyBundleURL(CFBundleGetMainBundle());
    LSSharedFileListRef loginItems = LSSharedFileListCreate(NULL, kLSSharedFileListSessionLoginItems, NULL);
    LSSharedFileListItemRef foundItem = findStartupItemInList(loginItems, bitcoinAppUrl);

    if(fAutoStart && !foundItem) {
        // add bitcoin app to startup item list
        LSSharedFileListInsertItemURL(loginItems, kLSSharedFileListItemBeforeFirst, NULL, NULL, bitcoinAppUrl, NULL, NULL);
    }
    else if(!fAutoStart && foundItem) {
        // remove item
        LSSharedFileListItemRemove(loginItems, foundItem);
    }
    return true;
}
#else

bool GetStartOnSystemStartup() { return false; }
bool SetStartOnSystemStartup(bool fAutoStart) { return false; }

#endif

void saveWindowGeometry(const QString& strSetting, QWidget *parent)
{
    QSettings settings;
    settings.setValue(strSetting + "Pos", parent->pos());
    settings.setValue(strSetting + "Size", parent->size());
}

void restoreWindowGeometry(const QString& strSetting, const QSize& defaultSize, QWidget *parent)
{
    QSettings settings;
    QPoint pos = settings.value(strSetting + "Pos").toPoint();
    QSize size = settings.value(strSetting + "Size", defaultSize).toSize();

    if (!pos.x() && !pos.y()) {
        QRect screen = QApplication::desktop()->screenGeometry();
        pos.setX((screen.width() - size.width()) / 2);
        pos.setY((screen.height() - size.height()) / 2);
    }

    parent->resize(size);
    parent->move(pos);
}

void setClipboard(const QString& str)
{
    QApplication::clipboard()->setText(str, QClipboard::Clipboard);
    QApplication::clipboard()->setText(str, QClipboard::Selection);
}

#if BOOST_FILESYSTEM_VERSION >= 3
boost::filesystem::path qstringToBoostPath(const QString &path)
{
    return boost::filesystem::path(path.toStdString(), utf8);
}

QString boostPathToQString(const boost::filesystem::path &path)
{
    return QString::fromStdString(path.string(utf8));
}
#else
#warning Conversion between boost path and QString can use invalid character encoding with boost_filesystem v2 and older
boost::filesystem::path qstringToBoostPath(const QString &path)
{
    return boost::filesystem::path(path.toStdString());
}

QString boostPathToQString(const boost::filesystem::path &path)
{
    return QString::fromStdString(path.string());
}
#endif

} // namespace GUIUtil