Gui: Fix black tooltip

src/Gui/DlgPreferencesImp.cpp

@@ -48,7 +48,7 @@
 #include <Base/Tools.h>
 
 #include "DlgPreferencesImp.h"
 #include "ui_DlgPreferences.h"
 #include "BitmapFactory.h"
 #include "MainWindow.h"
 #include "Tools.h"
@@ -56,7 +56,7 @@
 
 using namespace Gui::Dialog;
 
 bool isParentOf(const QModelIndex& parent, const QModelIndex& child)
 {
     for (auto it = child; it.isValid(); it = it.parent()) {
         if (it == parent) {
@@ -78,6 +78,29 @@
     return root;
 }
 
+// ----------------------------------------------------------------------------
+
+PreferencesDelegate::PreferencesDelegate(QObject* parent)
+    : QStyledItemDelegate(parent)
+{}
+
+bool PreferencesDelegate::helpEvent(QHelpEvent *event,
+                                    QAbstractItemView *view,
+                                    const QStyleOptionViewItem &option,
+                                    const QModelIndex &index)
+{
+    if (event->type() == QEvent::ToolTip) {
+        QHelpEvent* he = static_cast<QHelpEvent*>(event);
+        QString tooltip = index.isValid() ? index.data(Qt::ToolTipRole).toString() : QString();
+        QToolTip::showText(he->globalPos(), tooltip);
+        event->setAccepted(!tooltip.isEmpty());
+        return true;
+    }
+    return QStyledItemDelegate::helpEvent(event, view, option, index);
+}
+
+// ----------------------------------------------------------------------------
+
 QWidget* PreferencesPageItem::getWidget() const
 {
     return _widget;
@@ -136,6 +159,7 @@
     setupConnections();
 
     ui->groupsTreeView->setModel(&_model);
+    ui->groupsTreeView->setItemDelegate(new PreferencesDelegate(this));
 
     setupPages();
 
@@ -203,7 +227,7 @@
     updatePageDependentWidgets();
 }
 
 QPixmap DlgPreferencesImp::loadIconForGroup(const std::string &name) const
 {
     // normalize file name
     auto normalizeName = [](std::string str) {
@@ -248,7 +272,7 @@
     QString tooltip;
     getGroupData(groupName, iconName, tooltip);
 
     auto groupPages = new QStackedWidget;
     groupPages->setProperty(GroupNameProperty, QVariant(groupNameQString));
 
     connect(groupPages,
@@ -262,7 +286,7 @@
     }
     ui->groupWidgetStack->addWidget(groupPages);
 
     auto item = new PreferencesPageItem;
 
     item->setData(QVariant(groupNameQString), GroupNameRole);
     item->setText(QObject::tr(groupNameQString.toLatin1()));
@@ -310,7 +334,7 @@
             return;
         }
 
         auto pageItem = new PreferencesPageItem;
 
         pageItem->setText(page->windowTitle());
         pageItem->setEditable(false);
@@ -382,7 +406,7 @@
  * @see WidgetFactory
  * @see PrefPageProducer
  */
 void DlgPreferencesImp::addPage(const std::string& className, const std::string& group)
 {
     auto groupToAddTo = _pages.end();
     for (auto it = _pages.begin(); it != _pages.end(); ++it) {

src/Gui/DlgPreferencesImp.h

@@ -27,6 +27,7 @@
 #define GUI_DIALOG_DLGPREFERENCESIMP_H
 
 #include <QDialog>
+#include <QStyledItemDelegate>
 #include <QStandardItemModel>
 #include <QStackedWidget>
 #include <memory>
@@ -56,6 +57,19 @@ class PreferencesPageItem : public QStandardItem
     bool _expanded = false;
 };
 
+class PreferencesDelegate : public QStyledItemDelegate
+{
+    Q_OBJECT
+
+public:
+    explicit PreferencesDelegate(QObject *parent = nullptr);
+
+    bool helpEvent(QHelpEvent *event,
+                   QAbstractItemView *view,
+                   const QStyleOptionViewItem &option,
+                   const QModelIndex &index) override;
+};
+
 /**
  * This class implements a dialog containing several preference pages.
  *