text: // Copyright (c) 2011-2013 The Bitcoin developers
  // Copyright (c) 2017-2019 The PIVX developers
  // Distributed under the MIT/X11 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 "askpassphrasedialog.h"
  
  #include <QEvent>
  #include <QHeaderView>
  #include <QMessageBox>
  #include <QObject>
  #include <QProgressBar>
  #include <QString>
  #include <QTableView>
  #include <QTableWidget>
  
  #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
  
  /*
   * General GUI exception
   */
  class GUIException : public std::exception
  {
  public:
      std::string message;
      GUIException(const std::string &message) : message(message) {}
  };
  
  /** Utility functions used by the EZPAY Qt UI.
   */
  namespace GUIUtil
  {
  // Create human-readable string from date
  QString dateTimeStr(const QDateTime& datetime);
  QString dateTimeStrWithSeconds(const QDateTime& date);
  QString dateTimeStr(qint64 nTime);
  
  // Render EZPAY addresses in monospace font
  QFont bitcoinAddressFont();
  
  // Parse string into a CAmount value
  CAmount parseValue(const QString& text, int displayUnit, bool* valid_out = 0);
  
  // Format an amount
  QString formatBalance(CAmount amount, int nDisplayUnit = 0, bool isZpiv = false);
  
  // Set up widgets for address and amounts
  void setupAddressWidget(QValidatedLineEdit* widget, QWidget* parent);
  void setupAmountWidget(QLineEdit* widget, QWidget* parent);
  
  // Update the cursor of the widget after a text change
  void updateWidgetTextAndCursorPosition(QLineEdit* widget, const QString& str);
  
  // Parse "pivx:" 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();
  
  // Activate, show and raise the widget
  void bringToFront(QWidget* w);
  
  // Determine whether a widget is hidden behind other windows
  bool isObscured(QWidget* w);
  
  // Open debug.log
  bool openDebugLogfile();
  
  // Open eazypayza.conf
  bool openConfigfile();
  
  // Open masternode.conf
  bool openMNConfigfile();
  
  // Browse backup folder
  bool 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();
  };
  
  /**
       * Extension to QTableWidgetItem that facilitates proper ordering for "DHMS"
       * strings (primarily used in the masternode's "active" listing).
       */
  class DHMSTableWidgetItem : public QTableWidgetItem
  {
  public:
      DHMSTableWidgetItem(const int64_t seconds);
      virtual bool operator<(QTableWidgetItem const& item) const;
  
  private:
      // Private backing value for DHMS string, used for sorting.
      int64_t value;
  };
  
  bool GetStartOnSystemStartup();
  bool SetStartOnSystemStartup(bool fAutoStart);
  
  /** 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();
  
  /** Check whether a theme is not build-in */
  bool isExternal(QString theme);
  
  /* 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)
      // 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
  