Add splash screen to Object Creator (CleverRaven#67965)

* Add splash screen to creator_main

* Add another splash screen to the main window

* Streamline initialization of windows

* Properly show the splashscreen with loading message

- Favor showmessage() instead of QPainter since it's less lines of code
- Remove unnecessary code
- Put in the sleep so it actually works on linux too.

* Apparently the windows version requires the unistd import

* Wrap unistd in a linux condition

* Change sleep to std::this_thread::sleep_for

object_creator/creator_main.cpp

@@ -20,6 +20,8 @@
 
 #include <QtWidgets/qapplication.h>
 #include <QtCore/QSettings>
+#include <QtWidgets/qsplashscreen.h>
+#include <QtGui/qpainter.h>
 
 #ifdef _WIN32
 #include <QtCore/QtPlugin>
@@ -108,10 +110,23 @@ int main( int argc, char *argv[] )
 
     MAP_SHARING::setDefaults();
 
+    QApplication app( argc, argv );
+    //Create a splash screen that tells the user we're loading
+    //First we create a pixmap with the desired size
+    QPixmap splash( QSize(640, 480) );
+    splash.fill(Qt::gray);
+
+    //Then we create the splash screen and show it
+    QSplashScreen splashscreen( splash );
+    splashscreen.show();
+    splashscreen.showMessage( "Initializing Object Creator...", Qt::AlignCenter );
+    //let the thread sleep for two seconds to show the splashscreen
+    std::this_thread::sleep_for( std::chrono::seconds( 2 ) );
+    app.processEvents();
+
     QSettings settings( QSettings::IniFormat, QSettings::UserScope,
                         "CleverRaven", "Cataclysm - DDA" );
 
-
     cli_opts cli;
 
     rng_set_engine_seed( cli.seed );
@@ -138,6 +153,7 @@ int main( int argc, char *argv[] )
 
     world_generator = std::make_unique<worldfactory>();
     world_generator->init();
+
     std::vector<mod_id> mods;
     mods.push_back( mod_id( "dda" ) );
     if( settings.contains( "mods/include" ) ) {
@@ -150,7 +166,8 @@ int main( int argc, char *argv[] )
 
     g->load_core_data( ui );
     g->load_world_modfiles( ui );
+
+    splashscreen.finish( nullptr ); //Destroy the splashscreen
 
-    QApplication app( argc, argv );
     creator::main_window().execute( app );
 }

object_creator/creator_main_window.cpp

@@ -1,13 +1,12 @@
 #include "creator_main_window.h"
-
-#include "spell_window.h"
-#include "item_group_window.h"
 #include "enum_conversions.h"
 #include "translations.h"
 
 #include <QtWidgets/qapplication.h>
 #include <QtWidgets/qmainwindow.h>
 #include <QtWidgets/qtabwidget.h>
+#include <QtWidgets/qsplashscreen.h>
+#include <QtGui/qpainter.h>
 
 
 namespace io
@@ -30,29 +29,39 @@ namespace io
 
 int creator::main_window::execute( QApplication &app )
 {
-
     //Create the main window
     QMainWindow creator_main_window;
+    //Create a splash screen that tells the user we're loading
+    //First we create a pixmap with the desired size
+    QPixmap splash( QSize(640, 480) );
+    splash.fill(Qt::gray);
 
+    //Then we create the splash screen and show it
+    QSplashScreen splashscreen( splash );
+    splashscreen.show();
+    splashscreen.showMessage( "Loading mainwindow...", Qt::AlignCenter );
+    //let the thread sleep for a second to show the splashscreen
+    std::this_thread::sleep_for( std::chrono::seconds( 2 ) );
+    app.processEvents();
 
     //Create a tab widget and add it to the main window
     QTabWidget* tabWidget = new QTabWidget(&creator_main_window);
     creator_main_window.setCentralWidget(tabWidget);
 
     //Create the spell window and add it as a tab
-    spell_window spell_editor;
-    tabWidget->addTab(&spell_editor, "Spell");
+    spell_editor = new spell_window();
+    tabWidget->addTab(spell_editor, "Spell");
 
     //Create the item group window and add it as a tab
-    item_group_window item_group_editor;
-    tabWidget->addTab(&item_group_editor, "Item group");
+    item_group_editor = new item_group_window();
+    tabWidget->addTab(item_group_editor, "Item group");
 
     //Create the mod selection window and add it as a tab
     mod_selection = new mod_selection_window();
     tabWidget->addTab(mod_selection, "Mod selection");
-
-    //Make the main window maximized
-    creator_main_window.showMaximized();
 
+    creator_main_window.showMaximized();
+    splashscreen.finish( &creator_main_window ); //Destroy the splashscreen
+
     return app.exec();
 }

object_creator/creator_main_window.h

@@ -3,6 +3,9 @@
 
 #include "enum_traits.h"
 #include "mod_selection_window.h"
+#include "item_group_window.h"
+#include "spell_window.h"
+#include <thread> //include thread for the sleep_for function
 
 class QApplication;
 
@@ -14,6 +17,8 @@ class main_window
         int execute( QApplication &app );
     private:
         mod_selection_window* mod_selection;
+        item_group_window* item_group_editor;
+        spell_window* spell_editor;
 };
 
 enum class jsobj_type {