text: // Copyright (c) 2011-2015 The Bitcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #ifndef BITCOIN_QT_GUIUTIL_H
  #define BITCOIN_QT_GUIUTIL_H
  
  #include "amount.h"
  
  #include <QEvent>
  #include <QHeaderView>
  #include <QMessageBox>
  #include <QObject>
  #include <QProgressBar>
  #include <QString>
  #include <QTableView>
  
  #include <boost/filesystem.hpp>
  
  class QValidatedLineEdit;
  class SendCoinsRecipient;
  
  QT_BEGIN_NAMESPACE
  class QAbstractItemView;
  class QDateTime;
  class QFont;
  class QLineEdit;
  class QUrl;
  class QWidget;
  QT_END_NAMESPACE
  
  /** Utility functions used by the Gdcoin Qt UI.
   */
  namespace GUIUtil
  {
      // Create human-readable string from date
      QString dateTimeStr(const QDateTime &datetime);
      QString dateTimeStr(qint64 nTime);
  
      // Return a monospace font
      QFont fixedPitchFont();
  
      // Set up widgets for address and amounts
      void setupAddressWidget(QValidatedLineEdit *widget, QWidget *parent);
      void setupAmountWidget(QLineEdit *widget, QWidget *parent);
  
      // Parse "gdcoin:" URI into recipient object, return true on successful parsing
      bool parseBitcoinURI(const QUrl &uri, SendCoinsRecipient *out);
      bool parseBitcoinURI(QString uri, SendCoinsRecipient *out);
      QString formatBitcoinURI(const SendCoinsRecipient &info);
  
      // Returns true if given address+amount meets "dust" definition
      bool isDust(const QString& address, const CAmount& amount);
  
      // HTML escaping for rich text controls
      QString HtmlEscape(const QString& str, bool fMultiLine=false);
      QString HtmlEscape(const std::string& str, bool fMultiLine=false);
  
      /** Copy a field of the currently selected entry of a view to the clipboard. Does nothing if nothing
          is selected.
         @param[in] column  Data column to extract from the model
         @param[in] role    Data role to extract from the model
         @see  TransactionView::copyLabel, TransactionView::copyAmount, TransactionView::copyAddress
       */
      void copyEntryData(QAbstractItemView *view, int column, int role=Qt::EditRole);
  
      /** Return a field of the currently selected entry as a QString. Does nothing if nothing
          is selected.
         @param[in] column  Data column to extract from the model
         @param[in] role    Data role to extract from the model
         @see  TransactionView::copyLabel, TransactionView::copyAmount, TransactionView::copyAddress
       */
      QString getEntryData(QAbstractItemView *view, int column, int role);
  
      void setClipboard(const QString& str);
  
      /** Get save filename, mimics QFileDialog::getSaveFileName, except that it appends a default suffix
          when no suffix is provided by the user.
  
        @param[in] parent  Parent window (or 0)
        @param[in] caption Window caption (or empty, for default)
        @param[in] dir     Starting directory (or empty, to default to documents directory)
        @param[in] filter  Filter specification such as "Comma Separated Files (*.csv)"
        @param[out] selectedSuffixOut  Pointer to return the suffix (file type) that was selected (or 0).
                    Can be useful when choosing the save file format based on suffix.
       */
      QString getSaveFileName(QWidget *parent, const QString &caption, const QString &dir,
          const QString &filter,
          QString *selectedSuffixOut);
  
      /** Get open filename, convenience wrapper for QFileDialog::getOpenFileName.
  
        @param[in] parent  Parent window (or 0)
        @param[in] caption Window caption (or empty, for default)
        @param[in] dir     Starting directory (or empty, to default to documents directory)
        @param[in] filter  Filter specification such as "Comma Separated Files (*.csv)"
        @param[out] selectedSuffixOut  Pointer to return the suffix (file type) that was selected (or 0).
                    Can be useful when choosing the save file format based on suffix.
       */
      QString getOpenFileName(QWidget *parent, const QString &caption, const QString &dir,
          const QString &filter,
          QString *selectedSuffixOut);
  
      /** Get connection type to call object slot in GUI thread with invokeMethod. The call will be blocking.
  
         @returns If called from the GUI thread, return a Qt::DirectConnection.
                  If called from another thread, return a Qt::BlockingQueuedConnection.
      */
      Qt::ConnectionType blockingGUIThreadConnection();
  
      // Determine whether a widget is hidden behind other windows
      bool isObscured(QWidget *w);
  
      // Open debug.log
      void openDebugLogfile();
  	
      // Open gdcoin.conf
      void openConfigfile();	
  
      // Open masternode.conf
      void openMNConfigfile();	
  
      // Browse backup folder
      void showBackups();
  
      // Replace invalid default fonts with known good ones
      void SubstituteFonts(const QString& language);
  
      /** Qt event filter that intercepts ToolTipChange events, and replaces the tooltip with a rich text
        representation if needed. This assures that Qt can word-wrap long tooltip messages.
        Tooltips longer than the provided size threshold (in characters) are wrapped.
       */
      class ToolTipToRichTextFilter : public QObject
      {
          Q_OBJECT
  
      public:
          explicit ToolTipToRichTextFilter(int size_threshold, QObject *parent = 0);
  
      protected:
          bool eventFilter(QObject *obj, QEvent *evt);
  
      private:
          int size_threshold;
      };
  
      /**
       * Makes a QTableView last column feel as if it was being resized from its left border.
       * Also makes sure the column widths are never larger than the table's viewport.
       * In Qt, all columns are resizable from the right, but it's not intuitive resizing the last column from the right.
       * Usually our second to last columns behave as if stretched, and when on strech mode, columns aren't resizable
       * interactively or programatically.
       *
       * This helper object takes care of this issue.
       *
       */
      class TableViewLastColumnResizingFixer: public QObject
      {
          Q_OBJECT
  
          public:
              TableViewLastColumnResizingFixer(QTableView* table, int lastColMinimumWidth, int allColsMinimumWidth);
              void stretchColumnWidth(int column);
  
          private:
              QTableView* tableView;
              int lastColumnMinimumWidth;
              int allColumnsMinimumWidth;
              int lastColumnIndex;
              int columnCount;
              int secondToLastColumnIndex;
  
              void adjustTableColumnsWidth();
              int getAvailableWidthForColumn(int column);
              int getColumnsWidth();
              void connectViewHeadersSignals();
              void disconnectViewHeadersSignals();
              void setViewHeaderResizeMode(int logicalIndex, QHeaderView::ResizeMode resizeMode);
              void resizeColumn(int nColumnIndex, int width);
  
          private Q_SLOTS:
              void on_sectionResized(int logicalIndex, int oldSize, int newSize);
              void on_geometriesChanged();
      };
  
      bool GetStartOnSystemStartup();
      bool SetStartOnSystemStartup(bool fAutoStart);
  
      /** Modify Qt network specific settings on migration */
      void migrateQtSettings();
  
      /** Save window size and position */
      void saveWindowGeometry(const QString& strSetting, QWidget *parent);
      /** Restore window size and position */
      void restoreWindowGeometry(const QString& strSetting, const QSize &defaultSizeIn, QWidget *parent);
  
      /** Load global CSS theme */
      QString loadStyleSheet();
  
      /** Return name of current CSS theme */
      QString getThemeName();
      
      /* Convert QString to OS specific boost path through UTF-8 */
      boost::filesystem::path qstringToBoostPath(const QString &path);
  
      /* Convert OS specific boost path to QString through UTF-8 */
      QString boostPathToQString(const boost::filesystem::path &path);
  
      /* Convert seconds into a QString with days, hours, mins, secs */
      QString formatDurationStr(int secs);
  
      /* Format CNodeStats.nServices bitmask into a user-readable string */
      QString formatServicesStr(quint64 mask);
  
      /* Format a CNodeCombinedStats.dPingTime into a user-readable string or display N/A, if 0*/
      QString formatPingTime(double dPingTime);
  
      /* Format a CNodeCombinedStats.nTimeOffset into a user-readable string. */
      QString formatTimeOffset(int64_t nTimeOffset);
  
  #if defined(Q_OS_MAC) && QT_VERSION >= 0x050000
      // workaround for Qt OSX Bug:
      // https://bugreports.qt-project.org/browse/QTBUG-15631
      // QProgressBar uses around 10% CPU even when app is in background
      class ProgressBar : public QProgressBar
      {
          bool event(QEvent *e) {
              return (e->type() != QEvent::StyleAnimationUpdate) ? QProgressBar::event(e) : false;
          }
      };
  #else
      typedef QProgressBar ProgressBar;
  #endif
  
  } // namespace GUIUtil
  
  #endif // BITCOIN_QT_GUIUTIL_H
  