diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -156,7 +156,6 @@
     thumbnailprovider/thumbnailwriter.cpp
     thumbnailview/abstractthumbnailviewhelper.cpp
     thumbnailview/abstractdocumentinfoprovider.cpp
-    thumbnailview/contextbarbutton.cpp
     thumbnailview/dragpixmapgenerator.cpp
     thumbnailview/itemeditor.cpp
     thumbnailview/previewitemdelegate.cpp
diff --git a/lib/thumbnailview/contextbarbutton.h b/lib/thumbnailview/contextbarbutton.h
deleted file mode 100644
--- a/lib/thumbnailview/contextbarbutton.h
+++ /dev/null
@@ -1,65 +0,0 @@
-// vim: set tabstop=4 shiftwidth=4 expandtab:
-/*
-Gwenview: an image viewer
-Copyright 2011 Aurélien Gâteau <agateau@kde.org>
-
-This program is free software; you can redistribute it and/or
-modify it under the terms of the GNU General Public License
-as published by the Free Software Foundation; either version 2
-of the License, or (at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 51 Franklin Street, Fifth Floor, Cambridge, MA 02110-1301, USA.
-
-*/
-
-/*
-   *****************************************************
-   ******************************************************
-   **** NOTE: This class is deprecated. Do not use it. **
-   ****   It will be removed in the QT 6 timeframe.    **
-   ******************************************************
-   ******************************************************
-*/
-
-
-#ifndef CONTEXTBARBUTTON_H
-#define CONTEXTBARBUTTON_H
-
-// Local
-
-// KDE
-
-// Qt
-#include <QToolButton>
-
-namespace Gwenview
-{
-
-struct ContextBarButtonPrivate;
-/**
- * A button with a special look, appears when hovering over thumbnails
- */
-class ContextBarButton : public QToolButton
-{
-    Q_OBJECT
-public:
-    explicit ContextBarButton(const QString& iconName, QWidget* parent = nullptr);
-    ~ContextBarButton() override;
-
-protected:
-    void paintEvent(QPaintEvent*) override;
-
-private:
-    ContextBarButtonPrivate* const d;
-};
-
-} // namespace
-
-#endif /* CONTEXTBARBUTTON_H */
diff --git a/lib/thumbnailview/contextbarbutton.cpp b/lib/thumbnailview/contextbarbutton.cpp
deleted file mode 100644
--- a/lib/thumbnailview/contextbarbutton.cpp
+++ /dev/null
@@ -1,119 +0,0 @@
-// vim: set tabstop=4 shiftwidth=4 expandtab:
-/*
-Gwenview: an image viewer
-Copyright 2011 Aurélien Gâteau <agateau@kde.org>
-
-This program is free software; you can redistribute it and/or
-modify it under the terms of the GNU General Public License
-as published by the Free Software Foundation; either version 2
-of the License, or (at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 51 Franklin Street, Fifth Floor, Cambridge, MA 02110-1301, USA.
-
-*/
-
-/*
-   *****************************************************
-   ******************************************************
-   **** NOTE: This class is deprecated. Do not use it. **
-   ****   It will be removed in the QT 6 timeframe.    **
-   ******************************************************
-   ******************************************************
-*/
-
-
-// Self
-#include "contextbarbutton.h"
-
-// Local
-#include "paintutils.h"
-
-// KDE
-#include <KIconLoader>
-
-// Qt
-#include <QStyleOptionToolButton>
-#include <QStylePainter>
-
-namespace Gwenview
-{
-
-/** How lighter is the border of context bar buttons */
-const int CONTEXTBAR_BORDER_LIGHTNESS = 140;
-
-/** How darker is the background of context bar buttons */
-const int CONTEXTBAR_BACKGROUND_DARKNESS = 170;
-
-/** How lighter are context bar buttons when under mouse */
-const int CONTEXTBAR_MOUSEOVER_LIGHTNESS = 115;
-
-/** Radius of ContextBarButtons */
-const int CONTEXTBAR_RADIUS = 5;
-
-struct ContextBarButtonPrivate
-{
-};
-
-ContextBarButton::ContextBarButton(const QString& iconName, QWidget* parent)
-: QToolButton(parent)
-, d(new ContextBarButtonPrivate)
-{
-    const int size = KIconLoader::global()->currentSize(KIconLoader::Small);
-    setIconSize(QSize(size, size));
-    setAutoRaise(true);
-    setIcon(SmallIcon(iconName));
-}
-
-ContextBarButton::~ContextBarButton()
-{
-    delete d;
-}
-
-void Gwenview::ContextBarButton::paintEvent(QPaintEvent*)
-{
-    QStylePainter painter(this);
-    painter.setRenderHint(QPainter::Antialiasing);
-    QStyleOptionToolButton opt;
-    initStyleOption(&opt);
-
-    const QColor bgColor = palette().color(backgroundRole());
-    QColor color = bgColor.darker(CONTEXTBAR_BACKGROUND_DARKNESS);
-    QColor borderColor = bgColor.lighter(CONTEXTBAR_BORDER_LIGHTNESS);
-
-    if (opt.state & QStyle::State_MouseOver && opt.state & QStyle::State_Enabled) {
-        color = color.lighter(CONTEXTBAR_MOUSEOVER_LIGHTNESS);
-        borderColor = borderColor.lighter(CONTEXTBAR_MOUSEOVER_LIGHTNESS);
-    }
-
-    const QRectF rectF = QRectF(opt.rect).adjusted(0.5, 0.5, -0.5, -0.5);
-    const QPainterPath path = PaintUtils::roundedRectangle(rectF, CONTEXTBAR_RADIUS);
-
-    // Background
-    painter.fillPath(path, color);
-
-    // Top shadow
-    QLinearGradient gradient(rectF.topLeft(), rectF.topLeft() + QPoint(0, 5));
-    gradient.setColorAt(0, QColor::fromHsvF(0, 0, 0, .3));
-    gradient.setColorAt(1, Qt::transparent);
-    painter.fillPath(path, gradient);
-
-    // Left shadow
-    gradient.setFinalStop(rectF.topLeft() + QPoint(5, 0));
-    painter.fillPath(path, gradient);
-
-    // Border
-    painter.setPen(borderColor);
-    painter.drawPath(path);
-
-    // Content
-    painter.drawControl(QStyle::CE_ToolButtonLabel, opt);
-}
-
-} // namespace