uic: Generate version check macros around newly introduced palette color role

Change ebd3a13b807c6af2684b42d3912549caf7ef82aa introduced a new
QPaletter::PlaceholderText color role which causes the uic-generated
code not to compile when using Qt Designer embedded in Qt Creator with
older (5.9 LTS) kits. Generate a version check macro to fix this.

Change-Id: I6d9f7edb0c6047c2f64ef3357b29f91655c52aac
Fixes: QTBUG-72555
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Christian Ehrlicher <ch.ehrlicher@gmx.de>
Reviewed-by: André Hartmann <aha_1980@gmx.de>

1 files changed, 18 insertions, 1 deletions

diff --git a/src/tools/uic/cpp/cppwriteinitialization.cpp b/src/tools/uic/cpp/cppwriteinitialization.cpp
index 4f6ac1eb97..7ab6c31cb2 100644
--- a/src/tools/uic/cpp/cppwriteinitialization.cpp
+++ b/src/tools/uic/cpp/cppwriteinitialization.cpp
@@ -35,6 +35,7 @@
 #include "globaldefs.h"
 
 #include <qtextstream.h>
+#include <qversionnumber.h>
 #include <qdebug.h>
 
 #include <algorithm>
@@ -1765,6 +1766,13 @@ QString WriteInitialization::domColor2QString(const DomColor *c)
         .arg(c->elementBlue());
 }
 
+static inline QVersionNumber colorRoleVersionAdded(const QString &roleName)
+{
+    if (roleName == QLatin1String("PlaceholderText"))
+        return QVersionNumber(5, 12, 0);
+    return QVersionNumber();
+}
+
 void WriteInitialization::writeColorGroup(DomColorGroup *colorGroup, const QString &group, const QString &paletteName)
 {
     if (!colorGroup)
@@ -1785,10 +1793,19 @@ void WriteInitialization::writeColorGroup(DomColorGroup *colorGroup, const QStri
     const auto &colorRoles = colorGroup->elementColorRole();
     for (const DomColorRole *colorRole : colorRoles) {
         if (colorRole->hasAttributeRole()) {
+            const QString roleName = colorRole->attributeRole();
+            const QVersionNumber versionAdded = colorRoleVersionAdded(roleName);
             const QString brushName = writeBrushInitialization(colorRole->elementBrush());
+            if (!versionAdded.isNull()) {
+                m_output << "#if QT_VERSION >= QT_VERSION_CHECK("
+                    << versionAdded.majorVersion() << ", " << versionAdded.minorVersion()
+                    << ", " << versionAdded.microVersion() << ")\n";
+            }
             m_output << m_indent << paletteName << ".setBrush(" << group
-                << ", " << "QPalette::" << colorRole->attributeRole()
+                << ", " << "QPalette::" << roleName
                 << ", " << brushName << ");\n";
+            if (!versionAdded.isNull())
+                m_output << "#endif\n";
         }
     }
 }