diff --git a/libs/text/styles/KoParagraphStyle.h b/libs/text/styles/KoParagraphStyle.h
--- a/libs/text/styles/KoParagraphStyle.h
+++ b/libs/text/styles/KoParagraphStyle.h
@@ -721,7 +721,6 @@
 
 
 Q_SIGNALS:
-    void nameChanged(const QString &newName);
     void styleApplied(const KoParagraphStyle*) const;
 
 private:
diff --git a/libs/widgets/KoDialog.cpp b/libs/widgets/KoDialog.cpp
--- a/libs/widgets/KoDialog.cpp
+++ b/libs/widgets/KoDialog.cpp
@@ -157,10 +157,8 @@
     mButtonBox->addButton(button, role);
 
     mButtonList.insert(key, button);
-    mButtonSignalMapper.setMapping(button, key);
 
-    QObject::connect(button, SIGNAL(clicked()),
-                     &mButtonSignalMapper, SLOT(map()));
+    QObject::connect(button, &QPushButton::clicked, [this, key] { q_ptr->slotButtonClicked(key); });
 
     if (key == mDefaultButton) {
         // Now that it exists, set it as default
@@ -177,8 +175,6 @@
     q->setButtons(KoDialog::Ok | KoDialog::Cancel);
     q->setDefaultButton(KoDialog::Ok);
 
-    q->connect(&mButtonSignalMapper, SIGNAL(mapped(int)), q, SLOT(slotButtonClicked(int)));
-
     q->setPlainCaption(qApp->applicationDisplayName()); // set appropriate initial window title for case it gets not set later
 }
 
diff --git a/libs/widgets/KoDialog_p.h b/libs/widgets/KoDialog_p.h
--- a/libs/widgets/KoDialog_p.h
+++ b/libs/widgets/KoDialog_p.h
@@ -22,7 +22,6 @@
 
 #include "KoDialog.h"
 #include <QPointer>
-#include <QSignalMapper>
 #include <QSize>
 #include <QHash>
 
@@ -76,7 +75,6 @@
 
     QDialogButtonBox *mButtonBox;
     QHash<int, QPushButton *> mButtonList;
-    QSignalMapper mButtonSignalMapper;
 
 protected Q_SLOTS:
     void queuedLayoutUpdate();
diff --git a/plugins/formulashape/KoFormulaTool.h b/plugins/formulashape/KoFormulaTool.h
--- a/plugins/formulashape/KoFormulaTool.h
+++ b/plugins/formulashape/KoFormulaTool.h
@@ -26,7 +26,11 @@
 class KoFormulaShape;
 class FormulaEditor;
 class FormulaCommand;
-class QSignalMapper;
+
+struct TemplateAction {
+    QAction *action;
+    QString data;
+};
 
 /**
  * @short The flake tool for a formula
@@ -122,7 +126,7 @@
 
     QList<FormulaEditor*> m_cursorList;
 
-    QSignalMapper* m_signalMapper;
+    std::vector<TemplateAction> m_templateActions;
 };
 
 #endif
diff --git a/plugins/formulashape/KoFormulaTool.cpp b/plugins/formulashape/KoFormulaTool.cpp
--- a/plugins/formulashape/KoFormulaTool.cpp
+++ b/plugins/formulashape/KoFormulaTool.cpp
@@ -38,7 +38,6 @@
 #include <QAction>
 #include <QPainter>
 #include <QFile>
-#include <QSignalMapper>
 #include <QFileDialog>
 
 #include <KoShapeSavingContext.h>
@@ -54,13 +53,16 @@
 #include "FormulaRenderer.h"
 #include <QClipboard>
 
+// this adds const to non-const objects (like std::as_const)
+template <typename T> Q_DECL_CONSTEXPR typename std::add_const<T>::type &koAsConst(T &t) noexcept { return t; }
+// prevent rvalue arguments:
+template <typename T> void koAsConst(const T &&) = delete;
 
 
 KoFormulaTool::KoFormulaTool( KoCanvasBase* canvas ) : KoToolBase( canvas ),
                                                        m_formulaShape( 0 ),
                                                        m_formulaEditor( 0 )
 {
-    m_signalMapper = new QSignalMapper(this);
     setupActions();
     setTextMode(true);
 }
@@ -114,23 +116,25 @@
         m_formulaEditor = new FormulaEditor( m_formulaShape->formulaData());
     }
     connect(m_formulaShape->formulaData(), SIGNAL(dataChanged(FormulaCommand*,bool)), this, SLOT(updateCursor(FormulaCommand*,bool)));
-    connect(m_signalMapper, SIGNAL(mapped(QString)), this, SLOT(insert(QString)));
+    for (const TemplateAction &templateAction : koAsConst(m_templateActions)) {
+        connect(templateAction.action, &QAction::triggered, this, [this, templateAction] { insert(templateAction.data); });
+    }
     //Only for debugging:
     connect(action("write_elementTree"),SIGNAL(triggered(bool)), m_formulaShape->formulaData(), SLOT(writeElementTree()));
 }
 
 void KoFormulaTool::deactivate()
 {
+    for (const TemplateAction &templateAction : koAsConst(m_templateActions)) {
+        disconnect(templateAction.action, &QAction::triggered, this, nullptr);
+    }
     disconnect(m_formulaShape->formulaData(),0,this,0);
-    disconnect(m_signalMapper,0,this,0);
     if (canvas()) {
         m_cursorList.append(m_formulaEditor);
         debugFormula << "Appending cursor";
     }
     if (m_cursorList.count() > 20) { // don't let it grow indefinitely
-        //TODO: is this save?
-        delete m_cursorList[0];
-        m_cursorList.removeAt(0);
+        delete m_cursorList.takeAt(0);
     }
     m_formulaShape = 0;
 }
@@ -481,12 +485,11 @@
 void KoFormulaTool::addTemplateAction(const QString &caption, const QString &name, const QString &data,
                                       const char *iconName)
 {
-    QAction * action;
-    action = new QAction( caption, this );
-    m_signalMapper->setMapping(action, data);
-    addAction( name , action );
+    QAction *action = new QAction( caption, this );
+    addAction(name , action);
     action->setIcon(QIcon::fromTheme(QLatin1String(iconName)));
-    connect( action, SIGNAL(triggered()), m_signalMapper, SLOT(map()));
+    m_templateActions.push_back(TemplateAction { action, data });
+    // the connection takes place when this KoToolBase is activated
 }
 
 
diff --git a/plugins/textediting/spellcheck/SpellCheckMenu.h b/plugins/textediting/spellcheck/SpellCheckMenu.h
--- a/plugins/textediting/spellcheck/SpellCheckMenu.h
+++ b/plugins/textediting/spellcheck/SpellCheckMenu.h
@@ -30,7 +30,6 @@
 class QAction;
 class QAction;
 class QMenu;
-class QSignalMapper;
 class SpellCheck;
 
 class SpellCheckMenu : public QObject
@@ -63,7 +62,6 @@
     QAction *m_addToDictionaryAction;
     QMenu *m_suggestionsMenu;
     int m_lengthMisspelled;
-    QSignalMapper *m_suggestionsSignalMapper;
     int m_currentMisspelledPosition;
     QString m_currentMisspelled;
     QStringList m_suggestions;
diff --git a/plugins/textediting/spellcheck/SpellCheckMenu.cpp b/plugins/textediting/spellcheck/SpellCheckMenu.cpp
--- a/plugins/textediting/spellcheck/SpellCheckMenu.cpp
+++ b/plugins/textediting/spellcheck/SpellCheckMenu.cpp
@@ -27,7 +27,6 @@
 
 #include <QMenu>
 #include <QAction>
-#include <QSignalMapper>
 
 SpellCheckMenu::SpellCheckMenu(const Sonnet::Speller &speller, SpellCheck *spellCheck)
     : QObject(spellCheck),
@@ -37,7 +36,6 @@
     m_ignoreWordAction(0),
     m_addToDictionaryAction(0),
     m_suggestionsMenu(0),
-    m_suggestionsSignalMapper(new QSignalMapper(this)),
     m_currentMisspelledPosition(-1)
 {
     m_suggestionsMenuAction = new KActionMenu(i18n("Spelling"), this);
@@ -55,9 +53,6 @@
     // m_ignoreWordAction = new QAction(i18n("Ignore Word"), this);
     // connect(m_ignoreWordAction, SIGNAL(triggered()), this, SLOT(ignoreWord()));
 
-    connect(m_suggestionsSignalMapper, SIGNAL(mapped(QString)),
-            this, SLOT(replaceWord(QString)));
-
     setEnabled(false);
     setVisible(false);
 }
@@ -85,8 +80,7 @@
         for (int i = 0; i < m_suggestions.count(); ++i) {
             const QString &suggestion = m_suggestions.at(i);
             QAction *action = new QAction(suggestion, m_suggestionsMenu);
-            connect(action, SIGNAL(triggered()), m_suggestionsSignalMapper, SLOT(map()));
-            m_suggestionsSignalMapper->setMapping(action, suggestion);
+            connect(action, &QAction::triggered, [this, suggestion] { replaceWord(suggestion); });
             m_suggestionsMenu->addAction(action);
         }
     }
diff --git a/plugins/textshape/TextTool.cpp b/plugins/textshape/TextTool.cpp
--- a/plugins/textshape/TextTool.cpp
+++ b/plugins/textshape/TextTool.cpp
@@ -91,7 +91,6 @@
 #include <QTabWidget>
 #include <QTextDocumentFragment>
 #include <QToolTip>
-#include <QSignalMapper>
 #include <QGraphicsObject>
 #include <QLinearGradient>
 #include <QBitmap>
@@ -184,16 +183,13 @@
     }
 
     // setup the context list.
-    QSignalMapper *signalMapper = new QSignalMapper(this);
-    connect(signalMapper, SIGNAL(mapped(QString)), this, SLOT(startTextEditingPlugin(QString)));
     QList<QAction*> list;
     list.append(this->action("format_font"));
     foreach (const QString &key, KoTextEditingRegistry::instance()->keys()) {
         KoTextEditingFactory *factory =  KoTextEditingRegistry::instance()->value(key);
         if (factory && factory->showInMenu()) {
             QAction *a = new QAction(factory->title(), this);
-            connect(a, SIGNAL(triggered()), signalMapper, SLOT(map()));
-            signalMapper->setMapping(a, factory->id());
+            connect(a, &QAction::triggered, [this, factory] { startTextEditingPlugin(factory->id()); });
             list.append(a);
             addAction(QString("apply_%1").arg(factory->id()), a);
         }
diff --git a/plugins/textshape/dialogs/SimpleCitationBibliographyWidget.h b/plugins/textshape/dialogs/SimpleCitationBibliographyWidget.h
--- a/plugins/textshape/dialogs/SimpleCitationBibliographyWidget.h
+++ b/plugins/textshape/dialogs/SimpleCitationBibliographyWidget.h
@@ -31,7 +31,6 @@
 class KoBibliographyInfo;
 class BibliographyPreview;
 class BibliographyTemplate;
-class QSignalMapper;
 
 class SimpleCitationBibliographyWidget : public QWidget
 {
@@ -62,7 +61,6 @@
     //each template in the template list will have have a previewGenerator that will be deleted after preview is generated
     QList<BibliographyPreview *> m_previewGenerator;
     ItemChooserAction *m_chooser;
-    QSignalMapper *m_signalMapper;
     BibliographyTemplate *m_templateGenerator;
 };
 
diff --git a/plugins/textshape/dialogs/SimpleCitationBibliographyWidget.cpp b/plugins/textshape/dialogs/SimpleCitationBibliographyWidget.cpp
--- a/plugins/textshape/dialogs/SimpleCitationBibliographyWidget.cpp
+++ b/plugins/textshape/dialogs/SimpleCitationBibliographyWidget.cpp
@@ -28,13 +28,11 @@
 #include <QDebug>
 
 #include <QWidget>
-#include <QSignalMapper>
 
 SimpleCitationBibliographyWidget::SimpleCitationBibliographyWidget(ReferencesTool *tool, QWidget *parent)
         : QWidget(parent),
           m_blockSignals(false),
-          m_referenceTool(tool),
-          m_signalMapper(0)
+          m_referenceTool(tool)
 {
     widget.setupUi(this);
     Q_ASSERT(tool);
@@ -66,29 +64,20 @@
 void SimpleCitationBibliographyWidget::prepareTemplateMenu()
 {
     m_previewGenerator.clear();
-    if (m_signalMapper) {
-        delete m_signalMapper;
-        m_signalMapper = 0;
-    }
     qDeleteAll(m_templateList.begin(), m_templateList.end());
     m_templateList.clear();
 
-    m_signalMapper = new QSignalMapper();
-
     m_templateList = m_templateGenerator->templates();
 
-    connect(m_signalMapper, SIGNAL(mapped(int)), this, SLOT(pixmapReady(int)));
-
     m_chooser = widget.addBibliography->addItemChooser(1);
 
     int index = 0;
     foreach (KoBibliographyInfo *info, m_templateList) {
         BibliographyPreview *preview = new BibliographyPreview();
         preview->setStyleManager(KoTextDocument(m_referenceTool->editor()->document()).styleManager());
         preview->setPreviewSize(QSize(200,120));
         preview->updatePreview(info);
-        connect(preview, SIGNAL(pixmapGenerated()), m_signalMapper, SLOT(map()));
-        m_signalMapper->setMapping(preview, index);
+        connect(preview, &BibliographyPreview::pixmapGenerated, [this, index] { pixmapReady(index); });
         m_previewGenerator.append(preview);
         ++index;
 
@@ -118,7 +107,7 @@
 {
     // +1 to the templateId is because formattingButton does not allow id = 0
     widget.addBibliography->addItem(m_chooser, m_previewGenerator.at(templateId)->previewPixmap(), templateId + 1);
-    disconnect(m_previewGenerator.at(templateId), SIGNAL(pixmapGenerated()), m_signalMapper, SLOT(map()));
+    disconnect(m_previewGenerator.at(templateId), &BibliographyPreview::pixmapGenerated, this, nullptr);
     m_previewGenerator.at(templateId)->deleteLater();
 }
 
diff --git a/plugins/textshape/dialogs/SimpleParagraphWidget.h b/plugins/textshape/dialogs/SimpleParagraphWidget.h
--- a/plugins/textshape/dialogs/SimpleParagraphWidget.h
+++ b/plugins/textshape/dialogs/SimpleParagraphWidget.h
@@ -39,7 +39,6 @@
 class DockerStylesComboModel;
 class StylesDelegate;
 
-class QSignalMapper;
 namespace Lists {class ListStyleItem;};
 
 class SimpleParagraphWidget : public QWidget
diff --git a/plugins/textshape/dialogs/SimpleParagraphWidget.cpp b/plugins/textshape/dialogs/SimpleParagraphWidget.cpp
--- a/plugins/textshape/dialogs/SimpleParagraphWidget.cpp
+++ b/plugins/textshape/dialogs/SimpleParagraphWidget.cpp
@@ -62,7 +62,6 @@
 #include <QFlags>
 #include <QMenu>
 #include <QWidgetAction>
-#include <QSignalMapper>
 
 #include <QDebug>
 
diff --git a/plugins/textshape/dialogs/SimpleTableOfContentsWidget.h b/plugins/textshape/dialogs/SimpleTableOfContentsWidget.h
--- a/plugins/textshape/dialogs/SimpleTableOfContentsWidget.h
+++ b/plugins/textshape/dialogs/SimpleTableOfContentsWidget.h
@@ -30,7 +30,6 @@
 class KoStyleManager;
 class KoTableOfContentsGeneratorInfo;
 class TableOfContentsPreview;
-class QSignalMapper;
 class TableOfContentsTemplate;
 
 class SimpleTableOfContentsWidget : public QWidget
@@ -62,7 +61,6 @@
     QList<TableOfContentsPreview *> m_previewGenerator;
     ItemChooserAction *m_chooser;
     ReferencesTool *m_referenceTool;
-    QSignalMapper *m_signalMapper;
     TableOfContentsTemplate *m_templateGenerator;
 };
 
diff --git a/plugins/textshape/dialogs/SimpleTableOfContentsWidget.cpp b/plugins/textshape/dialogs/SimpleTableOfContentsWidget.cpp
--- a/plugins/textshape/dialogs/SimpleTableOfContentsWidget.cpp
+++ b/plugins/textshape/dialogs/SimpleTableOfContentsWidget.cpp
@@ -32,13 +32,11 @@
 
 #include <QWidget>
 #include <QMenu>
-#include <QSignalMapper>
 
 SimpleTableOfContentsWidget::SimpleTableOfContentsWidget(ReferencesTool *tool, QWidget *parent)
         : QWidget(parent),
         m_blockSignals(false),
-        m_referenceTool(tool),
-        m_signalMapper(0)
+        m_referenceTool(tool)
 {
     widget.setupUi(this);
     Q_ASSERT(tool);
@@ -64,29 +62,20 @@
 void SimpleTableOfContentsWidget::prepareTemplateMenu()
 {
     m_previewGenerator.clear();
-    if (m_signalMapper) {
-        delete m_signalMapper;
-        m_signalMapper = 0;
-    }
     qDeleteAll(m_templateList.begin(), m_templateList.end());
     m_templateList.clear();
 
-    m_signalMapper = new QSignalMapper();
-
     m_templateList = m_templateGenerator->templates();
 
-    connect(m_signalMapper, SIGNAL(mapped(int)), this, SLOT(pixmapReady(int)));
-
     m_chooser = widget.addToC->addItemChooser(1);
 
     int index = 0;
     foreach (KoTableOfContentsGeneratorInfo *info, m_templateList) {
         TableOfContentsPreview *preview = new TableOfContentsPreview();
         preview->setStyleManager(KoTextDocument(m_referenceTool->editor()->document()).styleManager());
         preview->setPreviewSize(QSize(200,120));
         preview->updatePreview(info);
-        connect(preview, SIGNAL(pixmapGenerated()), m_signalMapper, SLOT(map()));
-        m_signalMapper->setMapping(preview, index);
+        connect(preview, &TableOfContentsPreview::pixmapGenerated, this, [this, index] { pixmapReady(index); });
         m_previewGenerator.append(preview);
         ++index;
 
@@ -109,7 +98,7 @@
 {
     // +1 to the templateId is because formattingButton does not allow id = 0
     widget.addToC->addItem(m_chooser, m_previewGenerator.at(templateId)->previewPixmap(), templateId + 1);
-    disconnect(m_previewGenerator.at(templateId), SIGNAL(pixmapGenerated()), m_signalMapper, SLOT(map()));
+    disconnect(m_previewGenerator.at(templateId), &TableOfContentsPreview::pixmapGenerated, this, nullptr);
     m_previewGenerator.at(templateId)->deleteLater();
 }
 
diff --git a/plugins/textshape/dialogs/StylesModel.h b/plugins/textshape/dialogs/StylesModel.h
--- a/plugins/textshape/dialogs/StylesModel.h
+++ b/plugins/textshape/dialogs/StylesModel.h
@@ -34,7 +34,6 @@
 class KoCharacterStyle;
 
 class QImage;
-class QSignalMapper;
 
 /** This class is used to provide widgets (like the @class StylesCombo) the styles available to the document being worked on. The @class StylesModel can be of two types: character styles or paragraph styles type. This allows the widget to ignore the type of style it is handling.
   * Character styles in ODF can be specified in two ways. First, a named character style, specifying character formatting properties. It is meant to be used on a couple of individual characters. Secondly, a paragraph style also specifies character formatting properties, which are to be considered the default for that particular paragraph.
@@ -165,8 +164,6 @@
     KoParagraphStyle *m_currentParagraphStyle;
     KoCharacterStyle *m_defaultCharacterStyle;
 
-    QSignalMapper *m_styleMapper;
-
     bool m_provideStyleNone;
 };
 
diff --git a/plugins/textshape/dialogs/StylesModel.cpp b/plugins/textshape/dialogs/StylesModel.cpp
--- a/plugins/textshape/dialogs/StylesModel.cpp
+++ b/plugins/textshape/dialogs/StylesModel.cpp
@@ -28,7 +28,6 @@
 #include <QImage>
 #include <QList>
 #include <QSharedPointer>
-#include <QSignalMapper>
 #include <QCollator>
 
 #include <klocalizedstring.h>
@@ -41,7 +40,6 @@
       m_styleManager(0),
       m_currentParagraphStyle(0),
       m_defaultCharacterStyle(0),
-      m_styleMapper(new QSignalMapper(this)),
       m_provideStyleNone(false)
 {
     m_modelType = modelType;
@@ -55,8 +53,6 @@
 
         m_provideStyleNone = true;
     }
-
-    connect(m_styleMapper, SIGNAL(mapped(int)), this, SLOT(updateName(int)));
 }
 
 StylesModel::~StylesModel()
@@ -321,9 +317,9 @@
         ++index;
     }
     beginInsertRows(QModelIndex(), index, index);
-    m_styleList.insert(begin, style->styleId());
-    m_styleMapper->setMapping(style, style->styleId());
-    connect(style, SIGNAL(nameChanged(QString)), m_styleMapper, SLOT(map()));
+    int styleId = style->styleId();
+    m_styleList.insert(begin, styleId);
+    connect(style, &KoParagraphStyle::nameChanged, this, [this, styleId] { updateName(styleId); });
     endInsertRows();
 }
 
@@ -346,9 +342,9 @@
 
     foreach(KoParagraphStyle *style, styles) {
         if (style != m_styleManager->defaultParagraphStyle()) { //The default character style is not user selectable. It only provides individual property defaults and is not a style per say.
-            m_styleList.append(style->styleId());
-            m_styleMapper->setMapping(style, style->styleId());
-            connect(style, SIGNAL(nameChanged(QString)), m_styleMapper, SLOT(map()));
+            int styleId = style->styleId();
+            m_styleList.append(styleId);
+            connect(style, &KoParagraphStyle::nameChanged, this, [this, styleId] { updateName(styleId); });
         }
     }
 
@@ -382,8 +378,8 @@
     beginInsertRows(QModelIndex(), index, index);
     m_styleList.insert(index, style->styleId());
     endInsertRows();
-    m_styleMapper->setMapping(style, style->styleId());
-    connect(style, SIGNAL(nameChanged(QString)), m_styleMapper, SLOT(map()));
+    int styleId = style->styleId();
+    connect(style, &KoParagraphStyle::nameChanged, this, [this, styleId] (const QString &) { updateName(styleId); });
 }
 
 bool sortCharacterStyleByName(KoCharacterStyle *style1, KoCharacterStyle *style2)
@@ -409,9 +405,9 @@
 
     foreach(KoCharacterStyle *style, styles) {
         if (style != m_styleManager->defaultCharacterStyle()) { //The default character style is not user selectable. It only provides individual property defaults and is not a style per say.
-            m_styleList.append(style->styleId());
-            m_styleMapper->setMapping(style, style->styleId());
-            connect(style, SIGNAL(nameChanged(QString)), m_styleMapper, SLOT(map()));
+            int styleId = style->styleId();
+            m_styleList.append(styleId);
+            connect(style, &KoParagraphStyle::nameChanged, this, [this, styleId] { updateName(styleId); });
         }
     }
 
@@ -423,8 +419,7 @@
 {
     int row = m_styleList.indexOf(style->styleId());
     beginRemoveRows(QModelIndex(), row, row);
-    m_styleMapper->removeMappings(style);
-    disconnect(style, SIGNAL(nameChanged(QString)), m_styleMapper, SLOT(map()));
+    disconnect(style, &KoParagraphStyle::nameChanged, this, nullptr);
     m_styleList.removeAt(row);
     endRemoveRows();
 }
@@ -434,8 +429,7 @@
 {
     int row = m_styleList.indexOf(style->styleId());
     beginRemoveRows(QModelIndex(), row, row);
-    m_styleMapper->removeMappings(style);
-    disconnect(style, SIGNAL(nameChanged(QString)), m_styleMapper, SLOT(map()));
+    disconnect(style, &KoParagraphStyle::nameChanged, this, nullptr);
     m_styleList.removeAt(row);
     endRemoveRows();
 }
diff --git a/words/plugins/scripting/Tool.h b/words/plugins/scripting/Tool.h
--- a/words/plugins/scripting/Tool.h
+++ b/words/plugins/scripting/Tool.h
@@ -22,7 +22,6 @@
 #ifndef SCRIPTING_TOOL_H
 #define SCRIPTING_TOOL_H
 
-#include <QSignalMapper>
 #include <QAction>
 
 #include <kdebug.h>
@@ -65,13 +64,11 @@
         KoCanvasBase* c = v ? v->canvasBase() : 0;
         m_toolproxy = c ? c->toolProxy() : 0;
 
-        m_signalMapper = new QSignalMapper(this);
         QHash<QString, QAction*> actionhash = actions();
         for (QHash<QString, QAction*>::const_iterator it = actionhash.constBegin(); it != actionhash.constEnd(); ++it) {
-            connect(it.value(), SIGNAL(triggered()), m_signalMapper, SLOT(map()));
-            m_signalMapper->setMapping(it.value() , it.key());
+            QString key = it.key();
+            connect(it.value(), &QAction::triggered, this, [this, key] { actionTriggered(key); });
         }
-        connect(m_signalMapper, SIGNAL(mapped(QString)), this, SIGNAL(actionTriggered(QString)));
 
         connect(KoToolManager::instance(), SIGNAL(changedTool(KoCanvasController*,int)), this, SIGNAL(changedTool()));
     }
@@ -155,7 +152,6 @@
 private:
     Module* m_module;
     KoToolProxy* m_toolproxy;
-    QSignalMapper* m_signalMapper;
 };
 
 }