qt: Remove QSignalMapper from TransactionView

The QSignalMapper class is obsolete since Qt 5.10.

Author: hebasto

src/qt/transactionview.cpp

@@ -30,7 +30,6 @@
 #include <QMenu>
 #include <QPoint>
 #include <QScrollBar>
-#include <QSignalMapper>
 #include <QTableView>
 #include <QTimer>
 #include <QUrl>
@@ -176,11 +175,6 @@ TransactionView::TransactionView(const PlatformStyle *platformStyle, QWidget *pa
     contextMenu->addAction(abandonAction);
     contextMenu->addAction(editLabelAction);
 
-    mapperThirdPartyTxUrls = new QSignalMapper(this);
-
-    // Connect actions
-    connect(mapperThirdPartyTxUrls, static_cast<void (QSignalMapper::*)(const QString&)>(&QSignalMapper::mapped), this, &TransactionView::openThirdPartyTxUrl);
-
     connect(dateWidget, static_cast<void (QComboBox::*)(int)>(&QComboBox::activated), this, &TransactionView::chooseDate);
     connect(typeWidget, static_cast<void (QComboBox::*)(int)>(&QComboBox::activated), this, &TransactionView::chooseType);
     connect(watchOnlyWidget, static_cast<void (QComboBox::*)(int)>(&QComboBox::activated), this, &TransactionView::chooseWatchonly);
@@ -246,15 +240,15 @@ void TransactionView::setModel(WalletModel *_model)
             QStringList listUrls = _model->getOptionsModel()->getThirdPartyTxUrls().split("|", QString::SkipEmptyParts);
             for (int i = 0; i < listUrls.size(); ++i)
             {
-                QString host = QUrl(listUrls[i].trimmed(), QUrl::StrictMode).host();
+                QString url = listUrls[i].trimmed();
+                QString host = QUrl(url, QUrl::StrictMode).host();
                 if (!host.isEmpty())
                 {
                     QAction *thirdPartyTxUrlAction = new QAction(host, this); // use host as menu item label
                     if (i == 0)
                         contextMenu->addSeparator();
                     contextMenu->addAction(thirdPartyTxUrlAction);
-                    connect(thirdPartyTxUrlAction, &QAction::triggered, mapperThirdPartyTxUrls, static_cast<void (QSignalMapper::*)()>(&QSignalMapper::map));
-                    mapperThirdPartyTxUrls->setMapping(thirdPartyTxUrlAction, listUrls[i].trimmed());
+                    connect(thirdPartyTxUrlAction, &QAction::triggered, [this, url] { openThirdPartyTxUrl(url); });
                 }
             }
         }

src/qt/transactionview.h

@@ -23,7 +23,6 @@ class QFrame;
 class QLineEdit;
 class QMenu;
 class QModelIndex;
-class QSignalMapper;
 class QTableView;
 QT_END_NAMESPACE
 
@@ -72,7 +71,6 @@ class TransactionView : public QWidget
     QLineEdit *amountWidget;
 
     QMenu *contextMenu;
-    QSignalMapper *mapperThirdPartyTxUrls;
 
     QFrame *dateRangeWidget;
     QDateTimeEdit *dateFrom;