From f3c697abe71c9847207f5087ef7faea9eea55079 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Fri, 11 Sep 2020 14:10:45 +0200
Subject: [PATCH] Gui: [skip ci] workaround for QWindowsStyle to disable spin
 buttons when it is set read-only

---
 src/Gui/QuantitySpinBox.cpp | 24 +++++++++++++++----
 src/Gui/QuantitySpinBox.h   |  1 +
 src/Gui/SpinBox.cpp         | 48 +++++++++++++++++++++++++++++++++++++
 src/Gui/SpinBox.h           |  4 ++++
 4 files changed, 73 insertions(+), 4 deletions(-)

diff --git a/src/Gui/QuantitySpinBox.cpp b/src/Gui/QuantitySpinBox.cpp
index f2b6f057eb..5bade8721e 100644
--- a/src/Gui/QuantitySpinBox.cpp
+++ b/src/Gui/QuantitySpinBox.cpp
@@ -23,17 +23,19 @@
 
 #include "PreCompiled.h"
 #ifndef _PreComp_
+# include <QApplication>
 # include <QDebug>
-# include <QLineEdit>
 # include <QFocusEvent>
 # include <QFontMetrics>
 # include <QHBoxLayout>
 # include <QLabel>
-# include <QStyle>
-# include <QPixmapCache>
+# include <QLineEdit>
 # include <QMouseEvent>
+# include <QPixmapCache>
+# include <QStyle>
+# include <QStyleOptionSpinBox>
+# include <QStylePainter>
 # include <QToolTip>
-# include <QApplication>
 #endif
 
 #include "QuantitySpinBox.h"
@@ -517,6 +519,20 @@ void Gui::QuantitySpinBox::keyPressEvent(QKeyEvent *event)
         QAbstractSpinBox::keyPressEvent(event);
 }
 
+void Gui::QuantitySpinBox::paintEvent(QPaintEvent*)
+{
+    QStyleOptionSpinBox opt;
+    initStyleOption(&opt);
+    if (hasExpression()) {
+        opt.activeSubControls &= ~QStyle::SC_SpinBoxUp;
+        opt.activeSubControls &= ~QStyle::SC_SpinBoxDown;
+        opt.state &= ~QStyle::State_Active;
+        opt.stepEnabled = StepNone;
+    }
+
+    QStylePainter p(this);
+    p.drawComplexControl(QStyle::CC_SpinBox, opt);
+}
 
 void QuantitySpinBox::updateText(const Quantity &quant)
 {
diff --git a/src/Gui/QuantitySpinBox.h b/src/Gui/QuantitySpinBox.h
index 4c95deb340..61b9719c89 100644
--- a/src/Gui/QuantitySpinBox.h
+++ b/src/Gui/QuantitySpinBox.h
@@ -156,6 +156,7 @@ protected:
     virtual void focusOutEvent(QFocusEvent * event);
     virtual void keyPressEvent(QKeyEvent *event);
     virtual void resizeEvent(QResizeEvent *event);
+    virtual void paintEvent(QPaintEvent *event);
 
 private:
     void updateText(const Base::Quantity&);
diff --git a/src/Gui/SpinBox.cpp b/src/Gui/SpinBox.cpp
index 74d45b7c77..e751c149f7 100644
--- a/src/Gui/SpinBox.cpp
+++ b/src/Gui/SpinBox.cpp
@@ -29,6 +29,9 @@
 # include <QStyle>
 # include <QLineEdit>
 # include <QKeyEvent>
+# include <QStyle>
+# include <QStyleOptionSpinBox>
+# include <QStylePainter>
 #endif
 
 #include "SpinBox.h"
@@ -409,6 +412,21 @@ void UIntSpinBox::keyPressEvent(QKeyEvent *event)
         QAbstractSpinBox::keyPressEvent(event);
 }
 
+void UIntSpinBox::paintEvent(QPaintEvent*)
+{
+    QStyleOptionSpinBox opt;
+    initStyleOption(&opt);
+    if (hasExpression()) {
+        opt.activeSubControls &= ~QStyle::SC_SpinBoxUp;
+        opt.activeSubControls &= ~QStyle::SC_SpinBoxDown;
+        opt.state &= ~QStyle::State_Active;
+        opt.stepEnabled = StepNone;
+    }
+
+    QStylePainter p(this);
+    p.drawComplexControl(QStyle::CC_SpinBox, opt);
+}
+
 // ----------------------------------------------------------------------------
 
 IntSpinBox::IntSpinBox(QWidget* parent) : QSpinBox(parent) {
@@ -587,6 +605,21 @@ void IntSpinBox::keyPressEvent(QKeyEvent *event)
         QAbstractSpinBox::keyPressEvent(event);
 }
 
+void IntSpinBox::paintEvent(QPaintEvent*)
+{
+    QStyleOptionSpinBox opt;
+    initStyleOption(&opt);
+    if (hasExpression()) {
+        opt.activeSubControls &= ~QStyle::SC_SpinBoxUp;
+        opt.activeSubControls &= ~QStyle::SC_SpinBoxDown;
+        opt.state &= ~QStyle::State_Active;
+        opt.stepEnabled = StepNone;
+    }
+
+    QStylePainter p(this);
+    p.drawComplexControl(QStyle::CC_SpinBox, opt);
+}
+
 // ----------------------------------------------------------------------------
 
 DoubleSpinBox::DoubleSpinBox(QWidget* parent): QDoubleSpinBox(parent) {
@@ -764,4 +797,19 @@ void DoubleSpinBox::keyPressEvent(QKeyEvent *event)
         QAbstractSpinBox::keyPressEvent(event);
 }
 
+void DoubleSpinBox::paintEvent(QPaintEvent*)
+{
+    QStyleOptionSpinBox opt;
+    initStyleOption(&opt);
+    if (hasExpression()) {
+        opt.activeSubControls &= ~QStyle::SC_SpinBoxUp;
+        opt.activeSubControls &= ~QStyle::SC_SpinBoxDown;
+        opt.state &= ~QStyle::State_Active;
+        opt.stepEnabled = StepNone;
+    }
+
+    QStylePainter p(this);
+    p.drawComplexControl(QStyle::CC_SpinBox, opt);
+}
+
 #include "moc_SpinBox.cpp"
diff --git a/src/Gui/SpinBox.h b/src/Gui/SpinBox.h
index 14b0dffab3..7369fe08f4 100644
--- a/src/Gui/SpinBox.h
+++ b/src/Gui/SpinBox.h
@@ -91,6 +91,8 @@ public:
 
     void keyPressEvent(QKeyEvent *event);
     void resizeEvent(QResizeEvent *event);
+    void paintEvent(QPaintEvent *event);
+
 Q_SIGNALS:
     void valueChanged( uint value );
 
@@ -131,6 +133,7 @@ public:
 
     void keyPressEvent(QKeyEvent *event);
     void resizeEvent(QResizeEvent *event);
+    void paintEvent(QPaintEvent *event);
 
 private Q_SLOTS:
     void finishFormulaDialog();
@@ -157,6 +160,7 @@ public:
 
     void keyPressEvent(QKeyEvent *event);
     void resizeEvent(QResizeEvent *event);
+    void paintEvent(QPaintEvent *event);
 
 private Q_SLOTS:
     void finishFormulaDialog();