Qt: Fix some Qt 5.15 deprecation warnings.

Use Qt::ItemFlags() instead of 0.

Use QFileDialog::Options() instead of 0.

Use QComboBox::textActivated instead of QComboBox::activated.

Switch to just using Qt::WindowFlags() in GeometryStateDialog. This
*should* work for Qt 5.5 and earlier, but if it doesn't we can switch
back.

Change-Id: Iaf4e7efa1a11fc7f3325b449eef1be308cd21b45
Reviewed-on: https://code.wireshark.org/review/37349
Petri-Dish: Anders Broman <a.broman58@gmail.com>
Tested-by: Petri Dish Buildbot
Reviewed-by: Anders Broman <a.broman58@gmail.com>

ui/qt/geometry_state_dialog.h

@@ -49,16 +49,11 @@ public:
 //
 // Pass in the parent on macOS and NULL elsewhere so that we have an
 // independent window that un-maximizes correctly.
-#if QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
-#define DEFAULT_WINDOW_FLAGS Qt::WindowFlags()
-#else
-#define DEFAULT_WINDOW_FLAGS 0
-#endif
 
 #ifdef Q_OS_MAC
-    explicit GeometryStateDialog(QWidget *parent, Qt::WindowFlags f = DEFAULT_WINDOW_FLAGS) : QDialog(parent, f) {}
+    explicit GeometryStateDialog(QWidget *parent, Qt::WindowFlags f = Qt::WindowFlags()) : QDialog(parent, f) {}
 #else
-    explicit GeometryStateDialog(QWidget *, Qt::WindowFlags f = DEFAULT_WINDOW_FLAGS) : QDialog(NULL, f) {}
+    explicit GeometryStateDialog(QWidget *, Qt::WindowFlags f = Qt::WindowFlags()) : QDialog(NULL, f) {}
 #endif
     ~GeometryStateDialog();
 

ui/qt/models/decode_as_model.cpp

@@ -50,7 +50,7 @@ DecodeAsModel::DecodeAsModel(QObject *parent, capture_file *cf) :
 Qt::ItemFlags DecodeAsModel::flags(const QModelIndex &index) const
 {
     if (!index.isValid())
-        return 0;
+        return Qt::ItemFlags();
 
     DecodeAsItem* item = decode_as_items_[index.row()];
 

ui/qt/models/enabled_protocols_model.cpp

@@ -189,7 +189,7 @@ QModelIndex EnabledProtocolsModel::index(int row, int column, const QModelIndex&
 Qt::ItemFlags EnabledProtocolsModel::flags(const QModelIndex &index) const
 {
     if (!index.isValid())
-        return 0;
+        return Qt::ItemFlags();
 
     Qt::ItemFlags flags = QAbstractItemModel::flags(index);
     switch(index.column())

ui/qt/models/info_proxy_model.cpp

@@ -72,7 +72,7 @@ Qt::ItemFlags InfoProxyModel::flags(const QModelIndex &index) const
     if (index.row() < sourceModel()->rowCount())
         return sourceModel()->flags(mapToSource(index));
 
-    return 0;
+    return Qt::ItemFlags();
 }
 
 QModelIndex InfoProxyModel::index(int row, int column, const QModelIndex &parent) const

ui/qt/models/interface_tree_cache_model.cpp

@@ -377,7 +377,7 @@ bool InterfaceTreeCacheModel::isAvailableField(const QModelIndex &index) const
 Qt::ItemFlags InterfaceTreeCacheModel::flags(const QModelIndex &index) const
 {
     if (! index.isValid())
-        return 0;
+        return Qt::ItemFlags();
 
     Qt::ItemFlags flags = Qt::ItemIsEnabled | Qt::ItemIsSelectable;
 

ui/qt/models/pref_models.cpp

@@ -536,13 +536,13 @@ bool AdvancedPrefsModel::setData(const QModelIndex &dataindex, const QVariant &v
 Qt::ItemFlags AdvancedPrefsModel::flags(const QModelIndex &index) const
 {
     if (!index.isValid())
-        return 0;
+        return Qt::ItemFlags();
 
     QModelIndex modelIndex = mapToSource(index);
 
     PrefsItem* item = static_cast<PrefsItem*>(modelIndex.internalPointer());
     if (item == NULL)
-        return 0;
+        return Qt::ItemFlags();
 
     Qt::ItemFlags flags = QAbstractItemModel::flags(index);
     if (item->getPref() == NULL) {
@@ -680,7 +680,7 @@ QVariant ModulePrefsModel::data(const QModelIndex &dataindex, int role) const
 Qt::ItemFlags ModulePrefsModel::flags(const QModelIndex &index) const
 {
     if (!index.isValid())
-        return 0;
+        return Qt::ItemFlags();
 
     bool disable_capture = true;
 #ifdef HAVE_LIBPCAP

ui/qt/models/uat_model.cpp

@@ -91,7 +91,7 @@ bool UatModel::revertChanges(QString &error)
 Qt::ItemFlags UatModel::flags(const QModelIndex &index) const
 {
     if (!index.isValid())
-        return 0;
+        return Qt::ItemFlags();
 
     uat_field_t *field = &uat_->fields[index.column()];
 

ui/qt/widgets/capture_filter_edit.cpp

@@ -209,8 +209,13 @@ CaptureFilterEdit::CaptureFilterEdit(QWidget *parent, bool plain) :
 
     QComboBox *cf_combo = qobject_cast<QComboBox *>(parent);
     if (cf_combo) {
+#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
+        connect(cf_combo, static_cast<void (QComboBox::*)(const QString &)>(&QComboBox::textActivated),
+                this, &CaptureFilterEdit::textEdited);
+#else
         connect(cf_combo, static_cast<void (QComboBox::*)(const QString &)>(&QComboBox::activated),
                 this, &CaptureFilterEdit::textEdited);
+#endif
     }
 
     QThread *syntax_thread = new QThread;

ui/qt/widgets/editor_file_dialog.cpp

@@ -25,7 +25,7 @@ EditorFileDialog::EditorFileDialog(const QModelIndex& index, enum FileMode mode,
     , caption_(caption)
     , directory_(directory)
     , filter_(filter)
-    , options_(0)
+    , options_(QFileDialog::Options())
 {
     if (mode_ == Directory)
         options_ = QFileDialog::ShowDirsOnly;