ProjectExplorer: Avoid accidental changes on spinbox via mouse scroll

- Introduced an Utils::attachWheelBlocker() to disable mouse wheel events on the "Parallel Jobs" field.
- This prevents unintentional modifications when users inadvertently scroll over the input.

Change-Id: Iccb93305fbcf399cae683412078782b5ea9f4ad6
Reviewed-by: <[email protected]>
Reviewed-by: Jarek Kobus <[email protected]>

1 files changed, 34 insertions, 0 deletions

diff --git a/src/libs/utils/guiutils.cpp b/src/libs/utils/guiutils.cpp
new file mode 100644
index 00000000000..bfafff677f7
--- /dev/null
+++ b/src/libs/utils/guiutils.cpp
@@ -0,0 +1,34 @@
+// Copyright (C) 2023 Tasuku Suzuki <[email protected]>
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include "guiutils.h"
+
+#include <QEvent>
+#include <QWidget>
+
+namespace Utils {
+
+namespace Internal {
+
+class WheelEventFilter : public QObject
+{
+public:
+    bool eventFilter(QObject *watched, QEvent *event) override {
+        auto widget = qobject_cast<QWidget *>(watched);
+        return event->type() == QEvent::Wheel
+               && widget
+               && widget->focusPolicy() != Qt::WheelFocus
+               && !widget->hasFocus();
+    }
+};
+
+} // namespace Internal
+
+void QTCREATOR_UTILS_EXPORT attachWheelBlocker(QWidget *widget)
+{
+    static Internal::WheelEventFilter instance;
+    widget->installEventFilter(&instance);
+    widget->setFocusPolicy(Qt::StrongFocus);
+}
+
+} // namespace Utils