ui: on windows, use native menus

Minor UI improvement for Windows users.

app/widget/footagecombobox/footagecombobox.cpp

@@ -2,9 +2,9 @@
 
 #include <QAction>
 #include <QDebug>
-#include <QMenu>
 
 #include "ui/icons/icons.h"
+#include "widget/menu/menu.h"
 
 FootageComboBox::FootageComboBox(QWidget *parent) :
   QComboBox(parent),
@@ -20,7 +20,7 @@ void FootageComboBox::showPopup()
     return;
   }
 
-  QMenu menu;
+  Menu menu;
 
   menu.setMinimumWidth(width());
 

app/widget/menu/menu.cpp

@@ -25,6 +25,8 @@
 Menu::Menu(QMenuBar *bar, const QObject* receiver, const char* member) :
   QMenu(bar)
 {
+  StyleManager::UseNativeWindowsStyling(this);
+
   bar->addMenu(this);
 
   if (receiver != nullptr) {
@@ -35,6 +37,8 @@ Menu::Menu(QMenuBar *bar, const QObject* receiver, const char* member) :
 Menu::Menu(Menu *menu, const QObject *receiver, const char *member) :
   QMenu(menu)
 {
+  StyleManager::UseNativeWindowsStyling(this);
+
   menu->addMenu(this);
 
   if (receiver != nullptr) {
@@ -45,11 +49,13 @@ Menu::Menu(Menu *menu, const QObject *receiver, const char *member) :
 Menu::Menu(QWidget *parent) :
   QMenu(parent)
 {
+  StyleManager::UseNativeWindowsStyling(this);
 }
 
 Menu::Menu(const QString &s, QWidget *parent) :
   QMenu(s, parent)
 {
+  StyleManager::UseNativeWindowsStyling(this);
 }
 
 QAction *Menu::AddItem(const QString &id,

app/widget/projectexplorer/projectexplorer.cpp

@@ -23,7 +23,6 @@
 #include <QDebug>
 #include <QDesktopServices>
 #include <QDir>
-#include <QMenu>
 #include <QProcess>
 #include <QUrl>
 #include <QVBoxLayout>
@@ -32,6 +31,7 @@
 #include "core.h"
 #include "dialog/footageproperties/footageproperties.h"
 #include "dialog/sequence/sequence.h"
+#include "widget/menu/menu.h"
 
 ProjectExplorer::ProjectExplorer(QWidget *parent) :
   QWidget(parent),
@@ -231,7 +231,7 @@ void ProjectExplorer::RenameTimerSlot()
 
 void ProjectExplorer::ShowContextMenu()
 {
-  QMenu menu;
+  Menu menu;
 
   // FIXME: Support for multiple items and items other than Footage
   QList<Item*> selected_items = SelectedItems();

app/widget/toolbar/toolbar.cpp

@@ -167,7 +167,7 @@ void Toolbar::SnappingButtonClicked(bool b)
 
 void Toolbar::AddButtonClicked()
 {
-  QMenu m(this);
+  Menu m(this);
 
   for (int i=0;i<Tool::kAddableCount;i++) {
     QAction* action = m.addAction(Tool::GetAddableObjectName(static_cast<Tool::AddableObject>(i)));

app/widget/viewer/viewer.cpp

@@ -455,7 +455,7 @@ void ViewerWidget::UpdateRendererParameters()
 
 void ViewerWidget::ShowContextMenu(const QPoint &pos)
 {
-  QMenu menu(static_cast<QWidget*>(sender()));
+  Menu menu(static_cast<QWidget*>(sender()));
 
   context_menu_widget_ = static_cast<ViewerGLWidget*>(sender());