From 6e2c17b8c1013bb3ea55a7d3f6657d10360657db Mon Sep 17 00:00:00 2001
From: Matthias Koefferlein <matthias@koefferlein.de>
Date: Sun, 16 Oct 2022 21:53:17 +0200
Subject: [PATCH] [consider merging] Qt4 compatibility

---
 src/ant/ant/antPropertiesPage.cc      |  1 +
 src/lay/lay/layMacroEditorDialog.cc   | 28 +++++++++++++++++++++++++--
 src/layui/layui/layPropertiesDialog.h |  1 +
 3 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/src/ant/ant/antPropertiesPage.cc b/src/ant/ant/antPropertiesPage.cc
index b381c9c11..63bb9406b 100644
--- a/src/ant/ant/antPropertiesPage.cc
+++ b/src/ant/ant/antPropertiesPage.cc
@@ -25,6 +25,7 @@
 #include "antPropertiesPage.h"
 #include "layLayoutViewBase.h"
 #include "layQtTools.h"
+#include "tlException.h"
 
 namespace ant
 {
diff --git a/src/lay/lay/layMacroEditorDialog.cc b/src/lay/lay/layMacroEditorDialog.cc
index 8b50c5cd9..62640266a 100644
--- a/src/lay/lay/layMacroEditorDialog.cc
+++ b/src/lay/lay/layMacroEditorDialog.cc
@@ -82,6 +82,23 @@ const std::string cfg_macro_editor_watch_expressions ("macro-editor-watch-expres
 const std::string cfg_macro_editor_debugging_enabled ("macro-editor-debugging-enabled");
 const std::string cfg_macro_editor_ignore_exception_list ("macro-editor-ignore-exception-list");
 
+// -----------------------------------------------------------------------------------------
+
+/**
+ *  @brief Finds the tab bar widget for a QTabWidget
+ */
+static QTabBar *tab_bar_of (QTabWidget *tab)
+{
+#if QT_VERSION >= 0x50000
+  return tab->tabBar ();
+#else
+  //  Qt 4 does not have a public method for getting the QTabBar
+  QTabBar *tb = tab->findChild<QTabBar *> ();
+  tl_assert (tb != 0);
+  return tb;
+#endif
+}
+
 // -----------------------------------------------------------------------------------------
 //  Implementation of the macro template selection dialog
 
@@ -322,6 +339,13 @@ MacroEditorDialog::MacroEditorDialog (lay::Dispatcher *pr, lym::MacroCollection
     macro_tree->addAction (actionSaveAs);
 
     macro_tree->header ()->hide ();
+    //  TODO: that is supposed to enable the horizontal scroll bar, but it doesn't:
+    macro_tree->header ()->setStretchLastSection (false);
+#if QT_VERSION >= 0x50000
+    macro_tree->header ()->setSectionResizeMode (QHeaderView::ResizeToContents);
+#else
+    macro_tree->header ()->setResizeMode (QHeaderView::ResizeToContents);
+#endif
 
     macro_tree->setItemDelegate (new EditRoleDelegate (macro_tree));
 
@@ -1543,7 +1567,7 @@ MacroEditorDialog::eventFilter (QObject *obj, QEvent *event)
 
     }
 
-  } else if (obj == tabWidget->tabBar () && dynamic_cast<QMouseEvent *> (event) != 0) {
+  } else if (obj == tab_bar_of (tabWidget) && dynamic_cast<QMouseEvent *> (event) != 0) {
 
     //  just spy on the events, don't eat them
     QMouseEvent *mouse_event = dynamic_cast<QMouseEvent *> (event);
@@ -2303,7 +2327,7 @@ MacroEditorDialog::close_many (int r2c)
 
 BEGIN_PROTECTED
 
-  int ci = tabWidget->tabBar ()->tabAt (m_mouse_pos);
+  int ci = tab_bar_of (tabWidget)->tabAt (m_mouse_pos);
   if (ci < 0) {
     return;
   }
diff --git a/src/layui/layui/layPropertiesDialog.h b/src/layui/layui/layPropertiesDialog.h
index 94fab9db2..c59f3975b 100644
--- a/src/layui/layui/layPropertiesDialog.h
+++ b/src/layui/layui/layPropertiesDialog.h
@@ -40,6 +40,7 @@
 #include <memory>
 
 class QStackedLayout;
+class QModelIndex;
 
 namespace Ui
 {