diff --git a/src/kcmkwin/kwinscreenedges/kwinscreenedge.h b/src/kcmkwin/kwinscreenedges/kwinscreenedge.h
index e56258e1c7..088e05d824 100644
--- a/src/kcmkwin/kwinscreenedges/kwinscreenedge.h
+++ b/src/kcmkwin/kwinscreenedges/kwinscreenedge.h
@@ -7,9 +7,7 @@
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
-
-#ifndef __KWINSCREENEDGE_H__
-#define __KWINSCREENEDGE_H__
+#pragma once
 
 #include <QWidget>
 
@@ -71,5 +69,3 @@ private:
 };
 
 } // namespace
-
-#endif
diff --git a/src/kcmkwin/kwinscreenedges/kwinscreenedgeconfigform.cpp b/src/kcmkwin/kwinscreenedges/kwinscreenedgeconfigform.cpp
index 567cc09b8b..95fcd3486f 100644
--- a/src/kcmkwin/kwinscreenedges/kwinscreenedgeconfigform.cpp
+++ b/src/kcmkwin/kwinscreenedges/kwinscreenedgeconfigform.cpp
@@ -16,7 +16,7 @@ namespace KWin
 
 KWinScreenEdgesConfigForm::KWinScreenEdgesConfigForm(QWidget *parent)
     : KWinScreenEdge(parent)
-    , ui(new Ui::KWinScreenEdgesConfigUI)
+    , ui(std::make_unique<Ui::KWinScreenEdgesConfigUI>())
 {
     ui->setupUi(this);
 
@@ -32,10 +32,7 @@ KWinScreenEdgesConfigForm::KWinScreenEdgesConfigForm(QWidget *parent)
     connect(ui->electricBorderCornerRatioSpin, qOverload<int>(&QSpinBox::valueChanged), this, &KWinScreenEdgesConfigForm::updateDefaultIndicators);
 }
 
-KWinScreenEdgesConfigForm::~KWinScreenEdgesConfigForm()
-{
-    delete ui;
-}
+KWinScreenEdgesConfigForm::~KWinScreenEdgesConfigForm() = default;
 
 void KWinScreenEdgesConfigForm::setElectricBorderCornerRatio(double value)
 {
diff --git a/src/kcmkwin/kwinscreenedges/kwinscreenedgeconfigform.h b/src/kcmkwin/kwinscreenedges/kwinscreenedgeconfigform.h
index 2e93b955c2..0f205da787 100644
--- a/src/kcmkwin/kwinscreenedges/kwinscreenedgeconfigform.h
+++ b/src/kcmkwin/kwinscreenedges/kwinscreenedgeconfigform.h
@@ -66,7 +66,7 @@ private:
 
     bool m_defaultIndicatorVisible = false;
 
-    Ui::KWinScreenEdgesConfigUI *ui;
+    std::unique_ptr<Ui::KWinScreenEdgesConfigUI> ui;
 };
 
 } // namespace
diff --git a/src/kcmkwin/kwinscreenedges/kwintouchscreenedgeconfigform.cpp b/src/kcmkwin/kwinscreenedges/kwintouchscreenedgeconfigform.cpp
index ac8e1f95d2..fa2b6c12f1 100644
--- a/src/kcmkwin/kwinscreenedges/kwintouchscreenedgeconfigform.cpp
+++ b/src/kcmkwin/kwinscreenedges/kwintouchscreenedgeconfigform.cpp
@@ -16,15 +16,12 @@ namespace KWin
 
 KWinTouchScreenEdgeConfigForm::KWinTouchScreenEdgeConfigForm(QWidget *parent)
     : KWinScreenEdge(parent)
-    , ui(new Ui::KWinTouchScreenConfigUi)
+    , ui(std::make_unique<Ui::KWinTouchScreenConfigUi>())
 {
     ui->setupUi(this);
 }
 
-KWinTouchScreenEdgeConfigForm::~KWinTouchScreenEdgeConfigForm()
-{
-    delete ui;
-}
+KWinTouchScreenEdgeConfigForm::~KWinTouchScreenEdgeConfigForm() = default;
 
 Monitor *KWinTouchScreenEdgeConfigForm::monitor() const
 {
diff --git a/src/kcmkwin/kwinscreenedges/kwintouchscreenedgeconfigform.h b/src/kcmkwin/kwinscreenedges/kwintouchscreenedgeconfigform.h
index ff7824aa2d..2fea084c00 100644
--- a/src/kcmkwin/kwinscreenedges/kwintouchscreenedgeconfigform.h
+++ b/src/kcmkwin/kwinscreenedges/kwintouchscreenedgeconfigform.h
@@ -33,7 +33,7 @@ protected:
     Monitor *monitor() const override;
 
 private:
-    Ui::KWinTouchScreenConfigUi *ui;
+    std::unique_ptr<Ui::KWinTouchScreenConfigUi> ui;
 };
 
 } // namespace
diff --git a/src/kcmkwin/kwinscreenedges/monitor.cpp b/src/kcmkwin/kwinscreenedges/monitor.cpp
index 0fa07140d8..a5f0cc8ffa 100644
--- a/src/kcmkwin/kwinscreenedges/monitor.cpp
+++ b/src/kcmkwin/kwinscreenedges/monitor.cpp
@@ -38,41 +38,36 @@ static QScreen *screenFromWidget(const QWidget *widget)
 Monitor::Monitor(QWidget *parent)
     : ScreenPreviewWidget(parent)
 {
-    for (int i = 0;
-         i < 8;
-         ++i) {
-        popups[i] = new QMenu(this);
+    for (auto &popup : m_popups) {
+        popup = std::make_unique<QMenu>(this);
     }
-    scene = new QGraphicsScene(this);
-    view = new QGraphicsView(scene, this);
-    view->setBackgroundBrush(Qt::black);
-    view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
-    view->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
-    view->setFocusPolicy(Qt::NoFocus);
-    view->setFrameShape(QFrame::NoFrame);
-    for (int i = 0;
-         i < 8;
-         ++i) {
-        items[i] = new Corner(this);
-        scene->addItem(items[i]);
-        hidden[i] = false;
-        grp[i] = new QActionGroup(this);
+    m_scene = std::make_unique<QGraphicsScene>(this);
+    m_view = std::make_unique<QGraphicsView>(m_scene.get(), this);
+    m_view->setBackgroundBrush(Qt::black);
+    m_view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    m_view->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    m_view->setFocusPolicy(Qt::NoFocus);
+    m_view->setFrameShape(QFrame::NoFrame);
+    for (size_t i = 0; i < m_items.size(); i++) {
+        m_items[i] = std::make_unique<Corner>(this);
+        m_scene->addItem(m_items[i].get());
+        m_hidden[i] = false;
+        m_actionGroups[i] = std::make_unique<QActionGroup>(this);
     }
     QRect avail = screenFromWidget(this)->geometry();
     setRatio((qreal)avail.width() / (qreal)avail.height());
     checkSize();
 }
 
+Monitor::~Monitor() = default;
+
 void Monitor::clear()
 {
-    for (int i = 0;
-         i < 8;
-         ++i) {
-        popups[i]->clear();
-        setEdge(i, false);
+    for (size_t i = 0; i < m_popups.size(); i++) {
+        m_popups[i]->clear();
+        m_items[i]->setActive(false);
         setEdgeHidden(i, false);
-        delete grp[i];
-        grp[i] = new QActionGroup(this);
+        m_actionGroups[i] = std::make_unique<QActionGroup>(this);
     }
 }
 
@@ -98,90 +93,80 @@ void Monitor::checkSize()
     QRect contentsRect = previewRect();
     // int w = 151;
     // int h = 115;
-    view->setGeometry(contentsRect);
-    scene->setSceneRect(QRect(QPoint(0, 0), contentsRect.size()));
-    int x2 = (contentsRect.width() - 20) / 2;
-    int x3 = contentsRect.width() - 20;
-    int y2 = (contentsRect.height() - 20) / 2;
-    int y3 = contentsRect.height() - 20;
-    items[0]->setRect(0, y2, 20, 20);
-    items[1]->setRect(x3, y2, 20, 20);
-    items[2]->setRect(x2, 0, 20, 20);
-    items[3]->setRect(x2, y3, 20, 20);
-    items[4]->setRect(0, 0, 20, 20);
-    items[5]->setRect(x3, 0, 20, 20);
-    items[6]->setRect(0, y3, 20, 20);
-    items[7]->setRect(x3, y3, 20, 20);
-}
-
-void Monitor::setEdge(int edge, bool set)
-{
-    items[edge]->setActive(set);
-}
-
-bool Monitor::edge(int edge) const
-{
-    return items[edge]->brush() == Qt::green;
+    m_view->setGeometry(contentsRect);
+    m_scene->setSceneRect(QRect(QPoint(0, 0), contentsRect.size()));
+    const int x2 = (contentsRect.width() - 20) / 2;
+    const int x3 = contentsRect.width() - 20;
+    const int y2 = (contentsRect.height() - 20) / 2;
+    const int y3 = contentsRect.height() - 20;
+    m_items[0]->setRect(0, y2, 20, 20);
+    m_items[1]->setRect(x3, y2, 20, 20);
+    m_items[2]->setRect(x2, 0, 20, 20);
+    m_items[3]->setRect(x2, y3, 20, 20);
+    m_items[4]->setRect(0, 0, 20, 20);
+    m_items[5]->setRect(x3, 0, 20, 20);
+    m_items[6]->setRect(0, y3, 20, 20);
+    m_items[7]->setRect(x3, y3, 20, 20);
 }
 
 void Monitor::setEdgeEnabled(int edge, bool enabled)
 {
-    for (QAction *action : std::as_const(popup_actions[edge])) {
+    for (QAction *action : std::as_const(m_popupActions[edge])) {
         action->setEnabled(enabled);
     }
 }
 
 void Monitor::setEdgeHidden(int edge, bool set)
 {
-    hidden[edge] = set;
+    m_hidden[edge] = set;
     if (set) {
-        items[edge]->hide();
+        m_items[edge]->hide();
     } else {
-        items[edge]->show();
+        m_items[edge]->show();
     }
 }
 
 bool Monitor::edgeHidden(int edge) const
 {
-    return hidden[edge];
+    return m_hidden[edge];
 }
 
 void Monitor::addEdgeItem(int edge, const QString &item)
 {
-    QAction *act = popups[edge]->addAction(item);
+    QAction *act = m_popups[edge]->addAction(item);
     act->setCheckable(true);
-    popup_actions[edge].append(act);
-    grp[edge]->addAction(act);
-    if (popup_actions[edge].count() == 1) {
+    m_popupActions[edge].append(act);
+    m_actionGroups[edge]->addAction(act);
+    if (m_popupActions[edge].count() == 1) {
         act->setChecked(true);
-        items[edge]->setToolTip(item);
+        m_items[edge]->setToolTip(item);
     }
-    setEdge(edge, !popup_actions[edge][0]->isChecked());
+    m_items[edge]->setActive(!m_popupActions[edge].front()->isChecked());
 }
 
 void Monitor::setEdgeItemEnabled(int edge, int index, bool enabled)
 {
-    popup_actions[edge][index]->setEnabled(enabled);
+    m_popupActions[edge][index]->setEnabled(enabled);
 }
 
 bool Monitor::edgeItemEnabled(int edge, int index) const
 {
-    return popup_actions[edge][index]->isEnabled();
+    return m_popupActions[edge][index]->isEnabled();
 }
 
 void Monitor::selectEdgeItem(int edge, int index)
 {
-    popup_actions[edge][index]->setChecked(true);
-    setEdge(edge, !popup_actions[edge][0]->isChecked());
-    QString actionText = popup_actions[edge][index]->text();
+    m_popupActions[edge][index]->setChecked(true);
+    m_items[edge]->setActive(!m_popupActions[edge].front()->isChecked());
+    QString actionText = m_popupActions[edge][index]->text();
     // remove accelerators added by KAcceleratorManager
     actionText = KLocalizedString::removeAcceleratorMarker(actionText);
-    items[edge]->setToolTip(actionText);
+    m_items[edge]->setToolTip(actionText);
 }
 
 int Monitor::selectedEdgeItem(int edge) const
 {
-    const auto actions = popup_actions[edge];
+    const auto &actions = m_popupActions[edge];
     for (QAction *act : actions) {
         if (act->isChecked()) {
             return actions.indexOf(act);
@@ -192,17 +177,15 @@ int Monitor::selectedEdgeItem(int edge) const
 
 void Monitor::popup(Corner *c, QPoint pos)
 {
-    for (int i = 0;
-         i < 8;
-         ++i) {
-        if (items[i] == c) {
-            if (popup_actions[i].count() == 0) {
+    for (size_t i = 0; i < m_items.size(); i++) {
+        if (m_items[i].get() == c) {
+            if (m_popupActions[i].empty()) {
                 return;
             }
-            if (QAction *a = popups[i]->exec(pos)) {
-                selectEdgeItem(i, popup_actions[i].indexOf(a));
+            if (QAction *a = m_popups[i]->exec(pos)) {
+                selectEdgeItem(i, m_popupActions[i].indexOf(a));
                 Q_EMIT changed();
-                Q_EMIT edgeSelectionChanged(i, popup_actions[i].indexOf(a));
+                Q_EMIT edgeSelectionChanged(i, m_popupActions[i].indexOf(a));
                 c->setToolTip(KLocalizedString::removeAcceleratorMarker(a->text()));
             }
             return;
@@ -213,12 +196,10 @@ void Monitor::popup(Corner *c, QPoint pos)
 
 void Monitor::flip(Corner *c, QPoint pos)
 {
-    for (int i = 0;
-         i < 8;
-         ++i) {
-        if (items[i] == c) {
-            if (popup_actions[i].count() == 0) {
-                setEdge(i, !edge(i));
+    for (size_t i = 0; i < m_items.size(); i++) {
+        if (m_items[i].get() == c) {
+            if (m_popupActions[i].empty()) {
+                m_items[i]->setActive(m_items[i]->brush() != Qt::green);
             } else {
                 popup(c, pos);
             }
@@ -229,52 +210,47 @@ void Monitor::flip(Corner *c, QPoint pos)
 }
 
 Monitor::Corner::Corner(Monitor *m)
-    : monitor(m)
-    , m_active(false)
-    , m_hover(false)
+    : m_monitor(m)
+    , m_button(std::make_unique<Plasma::FrameSvg>())
 {
-    button = new Plasma::FrameSvg();
-    button->setImagePath("widgets/button");
+    m_button->setImagePath("widgets/button");
     setAcceptHoverEvents(true);
 }
 
-Monitor::Corner::~Corner()
-{
-    delete button;
-}
+Monitor::Corner::~Corner() = default;
 
 void Monitor::Corner::contextMenuEvent(QGraphicsSceneContextMenuEvent *e)
 {
-    monitor->popup(this, e->screenPos());
+    m_monitor->popup(this, e->screenPos());
 }
 
 void Monitor::Corner::mousePressEvent(QGraphicsSceneMouseEvent *e)
 {
-    monitor->flip(this, e->screenPos());
+    m_monitor->flip(this, e->screenPos());
 }
 
 void Monitor::Corner::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
 {
     if (m_hover) {
-        button->setElementPrefix("normal");
+        m_button->setElementPrefix("normal");
 
         qreal left, top, right, bottom;
-        button->getMargins(left, top, right, bottom);
+        m_button->getMargins(left, top, right, bottom);
 
-        button->setElementPrefix("active");
+        m_button->setElementPrefix("active");
         qreal activeLeft, activeTop, activeRight, activeBottom;
-        button->getMargins(activeLeft, activeTop, activeRight, activeBottom);
+        m_button->getMargins(activeLeft, activeTop, activeRight, activeBottom);
 
         QRectF activeRect = QRectF(QPointF(0, 0), rect().size());
         activeRect.adjust(left - activeLeft, top - activeTop,
                           -(right - activeRight), -(bottom - activeBottom));
-        button->setElementPrefix("active");
-        button->resizeFrame(activeRect.size());
-        button->paintFrame(painter, rect().topLeft() + activeRect.topLeft());
+        m_button->setElementPrefix("active");
+        m_button->resizeFrame(activeRect.size());
+        m_button->paintFrame(painter, rect().topLeft() + activeRect.topLeft());
     } else {
-        button->setElementPrefix(m_active ? "pressed" : "normal");
-        button->resizeFrame(rect().size());
-        button->paintFrame(painter, rect().topLeft());
+        m_button->setElementPrefix(m_active ? "pressed" : "normal");
+        m_button->resizeFrame(rect().size());
+        m_button->paintFrame(painter, rect().topLeft());
     }
 
     if (m_active) {
diff --git a/src/kcmkwin/kwinscreenedges/monitor.h b/src/kcmkwin/kwinscreenedges/monitor.h
index 3dc7ee8d44..a8270a5bc9 100644
--- a/src/kcmkwin/kwinscreenedges/monitor.h
+++ b/src/kcmkwin/kwinscreenedges/monitor.h
@@ -16,6 +16,8 @@
 #include <QActionGroup>
 #include <QGraphicsItem>
 #include <QVector>
+#include <array>
+#include <memory>
 
 class QAction;
 class QGraphicsView;
@@ -30,14 +32,13 @@ class FrameSvg;
 namespace KWin
 {
 
-class Monitor
-    : public ScreenPreviewWidget
+class Monitor : public ScreenPreviewWidget
 {
     Q_OBJECT
 public:
     explicit Monitor(QWidget *parent);
-    void setEdge(int edge, bool set);
-    bool edge(int edge) const;
+    ~Monitor();
+
     void setEdgeEnabled(int edge, bool enabled);
     void setEdgeHidden(int edge, bool set);
     bool edgeHidden(int edge) const;
@@ -72,17 +73,16 @@ private:
     void popup(Corner *c, QPoint pos);
     void flip(Corner *c, QPoint pos);
     void checkSize();
-    QGraphicsView *view;
-    QGraphicsScene *scene;
-    Corner *items[8];
-    bool hidden[8];
-    QMenu *popups[8];
-    QVector<QAction *> popup_actions[8];
-    QActionGroup *grp[8];
+    std::unique_ptr<QGraphicsScene> m_scene;
+    std::unique_ptr<QGraphicsView> m_view;
+    std::array<std::unique_ptr<Corner>, 8> m_items;
+    std::array<bool, 8> m_hidden;
+    std::array<std::unique_ptr<QMenu>, 8> m_popups;
+    std::array<QVector<QAction *>, 8> m_popupActions;
+    std::array<std::unique_ptr<QActionGroup>, 8> m_actionGroups;
 };
 
-class Monitor::Corner
-    : public QGraphicsRectItem
+class Monitor::Corner : public QGraphicsRectItem
 {
 public:
     Corner(Monitor *m);
@@ -98,10 +98,10 @@ protected:
     void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = nullptr) override;
 
 private:
-    Monitor *monitor;
-    Plasma::FrameSvg *button;
-    bool m_active;
-    bool m_hover;
+    Monitor *const m_monitor;
+    const std::unique_ptr<Plasma::FrameSvg> m_button;
+    bool m_active = false;
+    bool m_hover = false;
 };
 
 } // namespace
diff --git a/src/kcmkwin/kwinscreenedges/screenpreviewwidget.cpp b/src/kcmkwin/kwinscreenedges/screenpreviewwidget.cpp
index db8aa35313..4599af248b 100644
--- a/src/kcmkwin/kwinscreenedges/screenpreviewwidget.cpp
+++ b/src/kcmkwin/kwinscreenedges/screenpreviewwidget.cpp
@@ -65,17 +65,14 @@ public:
 
 ScreenPreviewWidget::ScreenPreviewWidget(QWidget *parent)
     : QWidget(parent)
-    , d(new ScreenPreviewWidgetPrivate(this))
+    , d(std::make_unique<ScreenPreviewWidgetPrivate>(this))
 {
     d->screenGraphics = new Plasma::FrameSvg(this);
     d->screenGraphics->setImagePath("widgets/monitor");
     d->updateScreenGraphics();
 }
 
-ScreenPreviewWidget::~ScreenPreviewWidget()
-{
-    delete d;
-}
+ScreenPreviewWidget::~ScreenPreviewWidget() = default;
 
 void ScreenPreviewWidget::setPreview(const QPixmap &preview)
 {
diff --git a/src/kcmkwin/kwinscreenedges/screenpreviewwidget.h b/src/kcmkwin/kwinscreenedges/screenpreviewwidget.h
index f13fb3fd45..baa7b076c1 100644
--- a/src/kcmkwin/kwinscreenedges/screenpreviewwidget.h
+++ b/src/kcmkwin/kwinscreenedges/screenpreviewwidget.h
@@ -3,9 +3,7 @@
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
-
-#ifndef SCREENPREVIEWWIDGET_H
-#define SCREENPREVIEWWIDGET_H
+#pragma once
 
 #include <QWidget>
 
@@ -35,9 +33,7 @@ Q_SIGNALS:
     void imageDropped(const QString &);
 
 private:
-    ScreenPreviewWidgetPrivate *const d;
+    void updateRect(const QRectF &rect);
 
-    Q_PRIVATE_SLOT(d, void updateRect(const QRectF &rect))
+    const std::unique_ptr<ScreenPreviewWidgetPrivate> d;
 };
-
-#endif