fix: wheel event not propagating to parent in Qt6

include/widgets/dcombobox.h

@@ -23,6 +23,8 @@ class LIBDTKWIDGETSHARED_EXPORT DComboBox : public QComboBox, public DCORE_NAMES
 protected:
     DComboBox(DComboBoxPrivate &dd, QWidget *parent);
 
+    void wheelEvent(QWheelEvent *event) override;
+
     // QComboBox interface
 public:
     virtual void showPopup() override;

include/widgets/dslider.h

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2011 - 2022 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2011 - 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: LGPL-3.0-or-later
 

include/widgets/dspinbox.h

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2015 - 2022 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2015 - 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: LGPL-3.0-or-later
 
@@ -25,6 +25,10 @@ class LIBDTKWIDGETSHARED_EXPORT DSpinBox : public QSpinBox, public DTK_CORE_NAME
 public:
     explicit DSpinBox(QWidget *parent = nullptr);
 
+protected:
+    void wheelEvent(QWheelEvent *event) override;
+
+public:
     QLineEdit *lineEdit() const;
 
     bool isAlert() const;
@@ -65,6 +69,10 @@ class LIBDTKWIDGETSHARED_EXPORT DDoubleSpinBox : public QDoubleSpinBox, public D
 public:
     explicit DDoubleSpinBox(QWidget *parent = nullptr);
 
+protected:
+    void wheelEvent(QWheelEvent *event) override;
+
+public:
     bool isAlert() const;
     void showAlertMessage(const QString &text, int duration = 3000);
     void showAlertMessage(const QString &text, QWidget *follower, int duration = 3000);

src/widgets/dcombobox.cpp

@@ -29,9 +29,10 @@
 #include <QScrollBar>
 #include <QHeaderView>
 #include <QCursor>
 #include <QScreen>
 #include <QStack>
 #include <QWindow>
+#include <QWheelEvent>
 
 DWIDGET_BEGIN_NAMESPACE
 
@@ -109,6 +110,7 @@
 {
     D_D(DComboBox);
     d->init();
+    setFocusPolicy(Qt::StrongFocus);
 }
 
 DComboBox::DComboBox(DComboBoxPrivate &dd, QWidget *parent)
@@ -117,6 +119,16 @@
 {
     D_D(DComboBox);
     d->init();
+    setFocusPolicy(Qt::StrongFocus);
+}
+
+void DComboBox::wheelEvent(QWheelEvent *event)
+{
+    if (hasFocus()) {
+        QComboBox::wheelEvent(event);
+    } else {
+        QWidget::wheelEvent(event);
+    }
 }
 
 /*!

src/widgets/dslider.cpp

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2011 - 2022 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2011 - 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: LGPL-3.0-or-later
 
@@ -136,7 +136,11 @@ bool DSlider::eventFilter(QObject *watched, QEvent *e)
     Q_D(DSlider);
 
     if ((watched == d->slider) && (e->type() == QEvent::Wheel)) {
-        return !d->mouseWheelEnabled;
+        if (d->mouseWheelEnabled && d->slider->hasFocus()) {
+            return false;  // let QSlider::wheelEvent handle it (stepBy + accept)
+        }
+        e->ignore();  // Qt6: un-accept so event propagates to parent (e.g. scrollarea)
+        return true;   // block delivery to the inner QSlider
     }
 
     if (e->type() == QEvent::MouseButtonRelease) {

src/widgets/dspinbox.cpp

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2015 - 2022 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2015 - 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: LGPL-3.0-or-later
 
@@ -6,8 +6,10 @@
 
 #include "dspinbox.h"
 #include "private/dspinbox_p.h"
 #include "dlineedit.h"
 
+#include <QWheelEvent>
+
 DWIDGET_BEGIN_NAMESPACE
 
 DSpinBoxPrivate::DSpinBoxPrivate(DSpinBox *parent) :
@@ -63,6 +65,16 @@
     DObject(*new DSpinBoxPrivate(this))
 {
     d_func()->init();
+    setFocusPolicy(Qt::StrongFocus);
+}
+
+void DSpinBox::wheelEvent(QWheelEvent *event)
+{
+    if (hasFocus()) {
+        QSpinBox::wheelEvent(event);
+    } else {
+        QWidget::wheelEvent(event);
+    }
 }
 
 /*!
@@ -180,6 +192,16 @@
     DObject(*new DDoubleSpinBoxPrivate(this))
 {
     d_func()->init();
+    setFocusPolicy(Qt::StrongFocus);
+}
+
+void DDoubleSpinBox::wheelEvent(QWheelEvent *event)
+{
+    if (hasFocus()) {
+        QDoubleSpinBox::wheelEvent(event);
+    } else {
+        QWidget::wheelEvent(event);
+    }
 }
 
 bool DDoubleSpinBox::isAlert() const