text: // Copyright (c) 2011-2016 The Bitcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include "overviewpage.h"
  #include "ui_overviewpage.h"
  
  #include "bitcoinunits.h"
  #include "clientmodel.h"
  #include "guiconstants.h"
  #include "guiutil.h"
  #include "optionsmodel.h"
  #include "platformstyle.h"
  #include "transactionfilterproxy.h"
  #include "transactiontablemodel.h"
  #include "walletmodel.h"
  
  #include <QAbstractItemDelegate>
  #include <QPainter>
  
  #define DECORATION_SIZE 54
  #define NUM_ITEMS 5
  
  class TxViewDelegate : public QAbstractItemDelegate
  {
      Q_OBJECT
  public:
      TxViewDelegate(const PlatformStyle *_platformStyle, QObject *parent=nullptr):
          QAbstractItemDelegate(parent), unit(BitcoinUnits::BTC),
          platformStyle(_platformStyle)
      {
  
      }
  
      inline void paint(QPainter *painter, const QStyleOptionViewItem &option,
                        const QModelIndex &index ) const
      {
          painter->save();
  
          QIcon icon = qvariant_cast<QIcon>(index.data(TransactionTableModel::RawDecorationRole));
          QRect mainRect = option.rect;
          QRect decorationRect(mainRect.topLeft(), QSize(DECORATION_SIZE, DECORATION_SIZE));
          int xspace = DECORATION_SIZE + 8;
          int ypad = 6;
          int halfheight = (mainRect.height() - 2*ypad)/2;
          QRect amountRect(mainRect.left() + xspace, mainRect.top()+ypad, mainRect.width() - xspace, halfheight);
          QRect addressRect(mainRect.left() + xspace, mainRect.top()+ypad+halfheight, mainRect.width() - xspace, halfheight);
          icon = platformStyle->SingleColorIcon(icon);
          icon.paint(painter, decorationRect);
  
          QDateTime date = index.data(TransactionTableModel::DateRole).toDateTime();
          QString address = index.data(Qt::DisplayRole).toString();
          qint64 amount = index.data(TransactionTableModel::AmountRole).toLongLong();
          bool confirmed = index.data(TransactionTableModel::ConfirmedRole).toBool();
          QVariant value = index.data(Qt::ForegroundRole);
          QColor foreground = option.palette.color(QPalette::Text);
          if(value.canConvert<QBrush>())
          {
              QBrush brush = qvariant_cast<QBrush>(value);
              foreground = brush.color();
          }
  
          painter->setPen(foreground);
          QRect boundingRect;
          painter->drawText(addressRect, Qt::AlignLeft|Qt::AlignVCenter, address, &boundingRect);
  
          if (index.data(TransactionTableModel::WatchonlyRole).toBool())
          {
              QIcon iconWatchonly = qvariant_cast<QIcon>(index.data(TransactionTableModel::WatchonlyDecorationRole));
              QRect watchonlyRect(boundingRect.right() + 5, mainRect.top()+ypad+halfheight, 16, halfheight);
              iconWatchonly.paint(painter, watchonlyRect);
          }
  
          if(amount < 0)
          {
              foreground = COLOR_NEGATIVE;
          }
          else if(!confirmed)
          {
              foreground = COLOR_UNCONFIRMED;
          }
          else
          {
              foreground = option.palette.color(QPalette::Text);
          }
          painter->setPen(foreground);
          QString amountText = BitcoinUnits::formatWithUnit(unit, amount, true, BitcoinUnits::separatorAlways);
          if(!confirmed)
          {
              amountText = QString("[") + amountText + QString("]");
          }
          painter->drawText(amountRect, Qt::AlignRight|Qt::AlignVCenter, amountText);
  
          painter->setPen(option.palette.color(QPalette::Text));
          painter->drawText(amountRect, Qt::AlignLeft|Qt::AlignVCenter, GUIUtil::dateTimeStr(date));
  
          painter->restore();
      }
  
      inline QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
      {
          return QSize(DECORATION_SIZE, DECORATION_SIZE);
      }
  
      int unit;
      const PlatformStyle *platformStyle;
  
  };
  #include "overviewpage.moc"
  
  OverviewPage::OverviewPage(const PlatformStyle *platformStyle, QWidget *parent) :
      QWidget(parent),
      ui(new Ui::OverviewPage),
      clientModel(0),
      walletModel(0),
      currentBalance(-1),
      currentStake(-1),
      currentUnconfirmedBalance(-1),
      currentImmatureBalance(-1),
      currentWatchOnlyBalance(-1),
      currentWatchOnlyStake(-1),
      currentWatchUnconfBalance(-1),
      currentWatchImmatureBalance(-1),
      txdelegate(new TxViewDelegate(platformStyle, this))
  {
      ui->setupUi(this);
  
      // use a SingleColorIcon for the "out of sync warning" icon
      QIcon icon = platformStyle->SingleColorIcon(":/icons/warning");
      icon.addPixmap(icon.pixmap(QSize(64,64), QIcon::Normal), QIcon::Disabled); // also set the disabled icon because we are using a disabled QPushButton to work around missing HiDPI support of QLabel (https://bugreports.qt.io/browse/QTBUG-42503)
      ui->labelTransactionsStatus->setIcon(icon);
      ui->labelWalletStatus->setIcon(icon);
  
      // Recent transactions
      ui->listTransactions->setItemDelegate(txdelegate);
      ui->listTransactions->setIconSize(QSize(DECORATION_SIZE, DECORATION_SIZE));
      ui->listTransactions->setMinimumHeight(NUM_ITEMS * (DECORATION_SIZE + 2));
      ui->listTransactions->setAttribute(Qt::WA_MacShowFocusRect, false);
  
      connect(ui->listTransactions, SIGNAL(clicked(QModelIndex)), this, SLOT(handleTransactionClicked(QModelIndex)));
  
      // start with displaying the "out of sync" warnings
      showOutOfSyncWarning(true);
      connect(ui->labelWalletStatus, SIGNAL(clicked()), this, SLOT(handleOutOfSyncWarningClicks()));
      connect(ui->labelTransactionsStatus, SIGNAL(clicked()), this, SLOT(handleOutOfSyncWarningClicks()));
  }
  
  void OverviewPage::handleTransactionClicked(const QModelIndex &index)
  {
      if(filter)
          Q_EMIT transactionClicked(filter->mapToSource(index));
  }
  
  void OverviewPage::handleOutOfSyncWarningClicks()
  {
      Q_EMIT outOfSyncWarningClicked();
  }
  
  OverviewPage::~OverviewPage()
  {
      delete ui;
  }
  
  void OverviewPage::setBalance(const CAmount& balance, const CAmount& stake, const CAmount& unconfirmedBalance, const CAmount& immatureBalance, const CAmount& watchOnlyBalance, const CAmount& watchOnlyStake, const CAmount& watchUnconfBalance, const CAmount& watchImmatureBalance)
  {
      int unit = walletModel->getOptionsModel()->getDisplayUnit();
      currentBalance = balance;
      currentStake = stake;
      currentUnconfirmedBalance = unconfirmedBalance;
      currentImmatureBalance = immatureBalance;
      currentWatchOnlyBalance = watchOnlyBalance;
      currentWatchOnlyStake = watchOnlyStake;
      currentWatchUnconfBalance = watchUnconfBalance;
      currentWatchImmatureBalance = watchImmatureBalance;
      ui->labelBalance->setText(BitcoinUnits::formatWithUnit(unit, balance, false, BitcoinUnits::separatorAlways));
      ui->labelStake->setText(BitcoinUnits::formatWithUnit(unit, stake));
      ui->labelUnconfirmed->setText(BitcoinUnits::formatWithUnit(unit, unconfirmedBalance, false, BitcoinUnits::separatorAlways));
      ui->labelImmature->setText(BitcoinUnits::formatWithUnit(unit, immatureBalance, false, BitcoinUnits::separatorAlways));
      ui->labelTotal->setText(BitcoinUnits::formatWithUnit(unit, balance + stake + unconfirmedBalance + immatureBalance, false, BitcoinUnits::separatorAlways));
      ui->labelWatchAvailable->setText(BitcoinUnits::formatWithUnit(unit, watchOnlyBalance, false, BitcoinUnits::separatorAlways));
      ui->labelWatchStake->setText(BitcoinUnits::formatWithUnit(unit, watchOnlyStake, false, BitcoinUnits::separatorAlways));
      ui->labelWatchPending->setText(BitcoinUnits::formatWithUnit(unit, watchUnconfBalance, false, BitcoinUnits::separatorAlways));
      ui->labelWatchImmature->setText(BitcoinUnits::formatWithUnit(unit, watchImmatureBalance, false, BitcoinUnits::separatorAlways));
      ui->labelWatchTotal->setText(BitcoinUnits::formatWithUnit(unit, watchOnlyBalance + watchOnlyStake + watchUnconfBalance + watchImmatureBalance, false, BitcoinUnits::separatorAlways));
  
      // only show immature (newly mined) balance if it's non-zero, so as not to complicate things
      // for the non-mining users
      bool showImmature = immatureBalance != 0;
      bool showWatchOnlyImmature = watchImmatureBalance != 0;
  
      // for symmetry reasons also show immature label when the watch-only one is shown
      ui->labelImmature->setVisible(showImmature || showWatchOnlyImmature);
      ui->labelImmatureText->setVisible(showImmature || showWatchOnlyImmature);
      ui->labelWatchImmature->setVisible(showWatchOnlyImmature); // show watch-only immature balance
  }
  
  // show/hide watch-only labels
  void OverviewPage::updateWatchOnlyLabels(bool showWatchOnly)
  {
      ui->labelSpendable->setVisible(showWatchOnly);      // show spendable label (only when watch-only is active)
      ui->labelWatchonly->setVisible(showWatchOnly);      // show watch-only label
      ui->lineWatchBalance->setVisible(showWatchOnly);    // show watch-only balance separator line
      ui->labelWatchAvailable->setVisible(showWatchOnly); // show watch-only available balance
      ui->labelWatchStake->setVisible(showWatchOnly); // show watch-only available balance
      ui->labelWatchPending->setVisible(showWatchOnly);   // show watch-only pending balance
      ui->labelWatchTotal->setVisible(showWatchOnly);     // show watch-only total balance
  
      if (!showWatchOnly)
          ui->labelWatchImmature->hide();
  }
  
  void OverviewPage::setClientModel(ClientModel *model)
  {
      this->clientModel = model;
      if(model)
      {
          // Show warning if this is a prerelease version
          connect(model, SIGNAL(alertsChanged(QString)), this, SLOT(updateAlerts(QString)));
          updateAlerts(model->getStatusBarWarnings());
      }
  }
  
  void OverviewPage::setWalletModel(WalletModel *model)
  {
      this->walletModel = model;
      if(model && model->getOptionsModel())
      {
          // Set up transaction list
          filter.reset(new TransactionFilterProxy());
          filter->setSourceModel(model->getTransactionTableModel());
          filter->setLimit(NUM_ITEMS);
          filter->setDynamicSortFilter(true);
          filter->setSortRole(Qt::EditRole);
          filter->setShowInactive(false);
          filter->sort(TransactionTableModel::Date, Qt::DescendingOrder);
  
          ui->listTransactions->setModel(filter.get());
          ui->listTransactions->setModelColumn(TransactionTableModel::ToAddress);
  
          // Keep up to date with wallet
          setBalance(model->getBalance(), 
                      model->getStake(), 
                      model->getUnconfirmedBalance(), 
                      model->getImmatureBalance(),
                      model->getWatchBalance(), 
                      model->getWatchStake(), 
                      model->getWatchUnconfirmedBalance(), 
                      model->getWatchImmatureBalance());
          connect(model, SIGNAL(balanceChanged(CAmount,CAmount,CAmount,CAmount,CAmount,CAmount,CAmount,CAmount)), this, SLOT(setBalance(CAmount,CAmount,CAmount,CAmount,CAmount,CAmount,CAmount,CAmount)));
  
          connect(model->getOptionsModel(), SIGNAL(displayUnitChanged(int)), this, SLOT(updateDisplayUnit()));
  
          updateWatchOnlyLabels(model->haveWatchOnly());
          connect(model, SIGNAL(notifyWatchonlyChanged(bool)), this, SLOT(updateWatchOnlyLabels(bool)));
      }
  
      // update the display unit, to not use the default ("BTC")
      updateDisplayUnit();
  }
  
  void OverviewPage::updateDisplayUnit()
  {
      if(walletModel && walletModel->getOptionsModel())
      {
          if(currentBalance != -1)
              setBalance(currentBalance, 
                          currentStake, 
                          currentUnconfirmedBalance, 
                          currentImmatureBalance,
                          currentWatchOnlyBalance, 
                          currentWatchOnlyStake, 
                          currentWatchUnconfBalance, 
                          currentWatchImmatureBalance);
  
          // Update txdelegate->unit with the current unit
          txdelegate->unit = walletModel->getOptionsModel()->getDisplayUnit();
  
          ui->listTransactions->update();
      }
  }
  
  void OverviewPage::updateAlerts(const QString &warnings)
  {
      this->ui->labelAlerts->setVisible(!warnings.isEmpty());
      this->ui->labelAlerts->setText(warnings);
  }
  
  void OverviewPage::showOutOfSyncWarning(bool fShow)
  {
      ui->labelWalletStatus->setVisible(fShow);
      ui->labelTransactionsStatus->setVisible(fShow);
  }
  