Decreased CPU usage dramatically and fixed multiple UI navigation glitches.

Also did some code cleanup.

NEWS.md

@@ -56,6 +56,7 @@ Many bugs have been fixed, and numerous features that were only partially implem
 * Refactoring, cleanup and documentation of the source code, removal of deprecated files etc.
 * All required fonts bundled with the application, no dependencies on the OS to provide them any longer
 * Made pugixml an external dependency instead of bundling it
+* Decreased CPU usage dramatically by only rendering the currently visible view (previously every view were always rendered)
 * Updated the CMake/CPack install and package build script to work as expected (it can now generate .deb, .rpm, .dmg and NSIS installation packages)
 * Added support for Clang/LLVM, made the application build with no errors or warnings using this compiler (Unix and macOS only)
 * License files included for all the libraries and resources that are bundled with the application
@@ -79,6 +80,7 @@ Many bugs have been fixed, and numerous features that were only partially implem
 * The random game selection traversed folders, i.e. a game could be selected inside a subdirectory and vice versa
 * Deleting a game from the metadata editor did not delete the game media files or the entry in the gamelist.xml file
 * SystemView didn't properly loop the systems if only two systems were available
+* When changing to the video view style from inside a gamelist, the view was not initialized
 * Hidden files still showed up if they had a gamelist.xml entry
 * Fixed an annoying gamelist issue that caused the game images and data to be updated and rendered up to six times every time the list was scrolled
 * VRAM statistics overlay was somewhat broken and incorrectly displayed numbers in megabytes instead of mebibytes

es-app/src/animations/MoveCameraAnimation.h

@@ -1,11 +1,11 @@
+//  SPDX-License-Identifier: MIT
 //
+//  EmulationStation Desktop Edition
 //  MoveCameraAnimation.h
 //
-//  Animation to play when moving the camera, used by the slide transition style
+//  Animation to play when moving the camera, used by the slide transition style.
-//  (when moving between gamelists using quick system select).
 //
 
-#pragma once
 #ifndef ES_APP_ANIMATIONS_MOVE_CAMERA_ANIMATION_H
 #define ES_APP_ANIMATIONS_MOVE_CAMERA_ANIMATION_H
 

es-app/src/guis/GuiGamelistOptions.cpp

@@ -1,4 +1,6 @@
+//  SPDX-License-Identifier: MIT
 //
+//  EmulationStation Desktop Edition
 //  GuiGamelistOptions.cpp
 //
 //  Gamelist options menu for the 'Jump to...' quick selector,
@@ -19,8 +21,8 @@
 #include "FileFilterIndex.h"
 #include "FileSorts.h"
 #include "GuiMetaDataEd.h"
-#include "SystemData.h"
 #include "Sound.h"
+#include "SystemData.h"
 
 GuiGamelistOptions::GuiGamelistOptions(
             Window* window,
@@ -177,6 +179,11 @@ GuiGamelistOptions::GuiGamelistOptions(
 
 GuiGamelistOptions::~GuiGamelistOptions()
 {
+    // This is required for the situation where scrolling started just before the menu
+    // was openened. Without this, the scrolling would run until manually stopped after
+    // the menu has been closed.
+    ViewController::get()->stopScrolling();
+
     if (mCancelled)
         return;
 

es-app/src/guis/GuiGamelistOptions.h

@@ -1,4 +1,6 @@
+//  SPDX-License-Identifier: MIT
 //
+//  EmulationStation Desktop Edition
 //  GuiGamelistOptions.h
 //
 //  Gamelist options menu for the 'Jump to...' quick selector,
@@ -8,15 +10,14 @@
 //  metadata edit interface is covered by GuiMetaDataEd.
 //
 
-#pragma once
 #ifndef ES_APP_GUIS_GUI_GAME_LIST_OPTIONS_H
 #define ES_APP_GUIS_GUI_GAME_LIST_OPTIONS_H
 
 #include "components/MenuComponent.h"
 #include "components/OptionListComponent.h"
+#include "utils/StringUtil.h"
 #include "FileData.h"
 #include "GuiComponent.h"
-#include "utils/StringUtil.h"
 
 class IGameListView;
 class SystemData;

es-app/src/guis/GuiMenu.cpp

@@ -1,4 +1,6 @@
+//  SPDX-License-Identifier: MIT
 //
+//  EmulationStation Desktop Edition
 //  GuiMenu.cpp
 //
 //  Main menu.
@@ -17,9 +19,9 @@
 #include "guis/GuiMsgBox.h"
 #include "guis/GuiScraperMenu.h"
 #include "guis/GuiSettings.h"
+#include "views/gamelist/IGameListView.h"
 #include "views/UIModeController.h"
 #include "views/ViewController.h"
-#include "views/gamelist/IGameListView.h"
 #include "CollectionSystemManager.h"
 #include "EmulationStation.h"
 #include "FileSorts.h"
@@ -63,6 +65,14 @@ GuiMenu::GuiMenu(Window* window) : GuiComponent(window),
             Renderer::getScreenHeight() * 0.15f);
 }
 
+GuiMenu::~GuiMenu()
+{
+    // This is required for the situation where scrolling started just before the menu
+    // was openened. Without this, the scrolling would run until manually stopped after
+    // the menu has been closed.
+    ViewController::get()->stopScrolling();
+}
+
 void GuiMenu::openScraperSettings()
 {
     // Open the scrape menu.

es-app/src/guis/GuiMenu.h

@@ -1,11 +1,12 @@
+//  SPDX-License-Identifier: MIT
 //
+//  EmulationStation Desktop Edition
 //  GuiMenu.h
 //
 //  Main menu.
 //  Some submenus are covered in separate source files.
 //
 
-#pragma once
 #ifndef ES_APP_GUIS_GUI_MENU_H
 #define ES_APP_GUIS_GUI_MENU_H
 
@@ -16,6 +17,7 @@ class GuiMenu : public GuiComponent
 {
 public:
     GuiMenu(Window* window);
+    ~GuiMenu();
 
     bool input(InputConfig* config, Input input) override;
     void onSizeChanged() override;

es-app/src/views/SystemView.cpp

@@ -1,4 +1,6 @@
+//  SPDX-License-Identifier: MIT
 //
+//  EmulationStation Desktop Edition
 //  SystemView.cpp
 //
 //  Main system view.
@@ -177,10 +179,12 @@ bool SystemView::input(InputConfig* config, Input input)
         case VERTICAL:
         case VERTICAL_WHEEL:
             if (config->isMappedLike("up", input)) {
+                ViewController::get()->resetMovingCamera();
                 listInput(-1);
                 return true;
             }
             if (config->isMappedLike("down", input)) {
+                ViewController::get()->resetMovingCamera();
                 listInput(1);
                 return true;
             }
@@ -189,10 +193,12 @@ bool SystemView::input(InputConfig* config, Input input)
         case HORIZONTAL_WHEEL:
         default:
             if (config->isMappedLike("left", input)) {
+                ViewController::get()->resetMovingCamera();
                 listInput(-1);
                 return true;
             }
             if (config->isMappedLike("right", input)) {
+                ViewController::get()->resetMovingCamera();
                 listInput(1);
                 return true;
             }

es-app/src/views/SystemView.h

@@ -1,10 +1,11 @@
+//  SPDX-License-Identifier: MIT
 //
+//  EmulationStation Desktop Edition
 //  SystemView.h
 //
 //  Main system view.
 //
 
-#pragma once
 #ifndef ES_APP_VIEWS_SYSTEM_VIEW_H
 #define ES_APP_VIEWS_SYSTEM_VIEW_H
 

es-app/src/views/ViewController.cpp

@@ -1,4 +1,6 @@
+//  SPDX-License-Identifier: MIT
 //
+//  EmulationStation Desktop Edition
 //  ViewController.cpp
 //
 //  Handles overall system navigation including animations and transitions.
@@ -11,14 +13,13 @@
 
 #include "animations/Animation.h"
 #include "animations/LambdaAnimation.h"
-#include "animations/LaunchAnimation.h"
 #include "animations/MoveCameraAnimation.h"
 #include "guis/GuiInfoPopup.h"
 #include "guis/GuiMenu.h"
 #include "guis/GuiMsgBox.h"
 #include "views/gamelist/DetailedGameListView.h"
-#include "views/gamelist/IGameListView.h"
 #include "views/gamelist/GridGameListView.h"
+#include "views/gamelist/IGameListView.h"
 #include "views/gamelist/VideoGameListView.h"
 #include "views/SystemView.h"
 #include "views/UIModeController.h"
@@ -111,28 +112,59 @@ void ViewController::ReloadAndGoToStart()
     ViewController::get()->goToStart();
 }
 
+bool ViewController::isCameraMoving()
+{
+    if (mCurrentView) {
+        if (mCamera.r3().x() != -mCurrentView->getPosition().x() ||
+                mCamera.r3().y() != -mCurrentView->getPosition().y())
+            return true;
+    }
+    return false;
+}
+
+void ViewController::resetMovingCamera()
+{
+    if (isCameraMoving()) {
+        mCamera.r3().x() = -mCurrentView->getPosition().x();
+        mCamera.r3().y() = -mCurrentView->getPosition().y();
+        stopAllAnimations();
+    }
+}
+
+void ViewController::stopScrolling()
+{
+    mSystemListView->stopScrolling();
+    mCurrentView->stopListScrolling();
+
+    if (mSystemListView->isAnimationPlaying(0))
+        mSystemListView->finishAnimation(0);
+}
+
 int ViewController::getSystemId(SystemData* system)
 {
     std::vector<SystemData*>& sysVec = SystemData::sSystemVector;
-    return (int)(std::find(sysVec.cbegin(), sysVec.cend(), system) - sysVec.cbegin());
+    return static_cast<int>(std::find(sysVec.cbegin(), sysVec.cend(), system) - sysVec.cbegin());
 }
 
 void ViewController::goToSystemView(SystemData* system)
 {
-    // Tell any current view it's about to be hidden.
+    // Tell any current view it's about to be hidden and stop its rendering.
-    if (mCurrentView)
+    if (mCurrentView) {
         mCurrentView->onHide();
+        mCurrentView->setRenderView(false);
+    }
 
     mState.viewing = SYSTEM_SELECT;
     mState.system = system;
 
     auto systemList = getSystemListView();
-    systemList->setPosition(getSystemId(system) * (float)Renderer::getScreenWidth(),
+    systemList->setPosition(getSystemId(system) * static_cast<float>(Renderer::getScreenWidth()),
             systemList->getPosition().y());
 
     systemList->goToSystem(system, false);
     mCurrentView = systemList;
     mCurrentView->onShow();
+    mCurrentView->setRenderView(true);
     PowerSaver::setState(true);
 
     playViewTransition();
@@ -158,13 +190,29 @@ void ViewController::goToPrevGameList()
 
 void ViewController::goToGameList(SystemData* system)
 {
+    // Stop any scrolling, animations and camera movements.
+    if (mSystemListView) {
+        mSystemListView->stopScrolling();
+        if (mSystemListView->isAnimationPlaying(0))
+            mSystemListView->finishAnimation(0);
+    }
+    resetMovingCamera();
+
+    // Disable rendering of the system view.
+    if (getSystemListView()->getRenderView())
+        getSystemListView()->setRenderView(false);
+
+    // If switching between gamelists, disable rendering of the current view.
+    if (mCurrentView)
+        mCurrentView->setRenderView(false);
+
     if (mState.viewing == SYSTEM_SELECT) {
         // Move system list.
         auto sysList = getSystemListView();
         float offX = sysList->getPosition().x();
         int sysId = getSystemId(system);
 
-        sysList->setPosition(sysId * (float)Renderer::getScreenWidth(),
+        sysList->setPosition(sysId * static_cast<float>(Renderer::getScreenWidth()),
                 sysList->getPosition().y());
         offX = sysList->getPosition().x() - offX;
         mCamera.translation().x() -= offX;
@@ -178,8 +226,10 @@ void ViewController::goToGameList(SystemData* system)
 
     mCurrentView = getGameListView(system);
 
-    if (mCurrentView)
+    if (mCurrentView) {
         mCurrentView->onShow();
+        mCurrentView->setRenderView(true);
+    }
     playViewTransition();
 }
 
@@ -218,10 +268,10 @@ void ViewController::playViewTransition()
             // Not changing screens, so cancel the first half entirely.
             advanceAnimation(0, FADE_DURATION);
             advanceAnimation(0, FADE_WAIT);
-            advanceAnimation(0, FADE_DURATION - (int)(mFadeOpacity * FADE_DURATION));
+            advanceAnimation(0, FADE_DURATION - static_cast<int>(mFadeOpacity * FADE_DURATION));
         }
         else {
-            advanceAnimation(0, (int)(mFadeOpacity * FADE_DURATION));
+            advanceAnimation(0, static_cast<int>(mFadeOpacity * FADE_DURATION));
         }
     }
     else if (transition_style == "slide") {
@@ -247,90 +297,43 @@ void ViewController::onFileChanged(FileData* file, FileChangeType change)
 void ViewController::launch(FileData* game, Vector3f center)
 {
     if (game->getType() != GAME) {
-        LOG(LogError) << "tried to launch something that isn't a game";
+        LOG(LogError) << "tried to launch something that isn't a game.";
         return;
     }
 
-    // Hide the current view.
+    // If the video view style is used, pause the video currently playing or block the
+    // video from starting to play if the static image is still shown.
     if (mCurrentView)
-        mCurrentView->onHide();
+        mCurrentView->onPauseVideo();
 
-    Transform4x4f origCamera = mCamera;
-    origCamera.translation() = -mCurrentView->getPosition();
-
-    center += mCurrentView->getPosition();
     stopAnimation(1); // Make sure the fade in isn't still playing.
     mWindow->stopInfoPopup(); // Make sure we disable any existing info popup.
     mLockInput = true;
 
-    // TEMPORARY - Until a proper game launch screen is implemented, at least this
+    // Until a proper game launch screen is implemented, at least this will let the
-    // will let the user know that something is actually happening (in addition
+    // user know that something is actually happening (in addition to the launch sound,
-    // to the launch sound, if navigation sounds are enabled).
+    // if navigation sounds are enabled).
     GuiInfoPopup* s = new GuiInfoPopup(mWindow, "LAUNCHING GAME '" +
             Utils::String::toUpper(game->metadata.get("name") + "'"), 10000);
     mWindow->setInfoPopup(s);
 
-    std::string transition_style = Settings::getInstance()->getString("TransitionStyle");
-
     NavigationSounds::getInstance()->playThemeNavigationSound(LAUNCHSOUND);
-    // Let launch sound play to the end before launching game.
-    while (NavigationSounds::getInstance()->isPlayingThemeNavigationSound(LAUNCHSOUND));
 
-    // TEMPORARY - disabled the launch animations as they don't work properly and more
+    // This is just a dummy animation in order for the launch notification popup to be
-    // work is needed to fix them. This has been done in LaunchAnimation.h instead of here,
+    // displayed briefly, and for the navigation sound playing to be able to complete.
-    // as not calling the animation leads to input not being properly consumed. This also
+    // During this time period, all user input is blocked.
-    // needs to be fixed later on.
+    setAnimation(new LambdaAnimation([](float t){}, 1700), 0, [this, game] {
-    setAnimation(new LaunchAnimation(mCamera, mFadeOpacity, center, 1500), 0,
+        while (NavigationSounds::getInstance()->isPlayingThemeNavigationSound(LAUNCHSOUND));
-            [this, origCamera, center, game] {
         game->launchGame(mWindow);
-        mCamera = origCamera;
+        onFileChanged(game, FILE_METADATA_CHANGED);
-        setAnimation(new LaunchAnimation(mCamera, mFadeOpacity, center, 600), 0, [this] {
-                    mLockInput = false; }, true);
-        this->onFileChanged(game, FILE_METADATA_CHANGED);
         if (mCurrentView)
             mCurrentView->onShow();
+        // This is a workaround so that any key or button presses used for exiting the emulator
+        // are not captured upon returning to ES.
+        setAnimation(new LambdaAnimation([](float t){}, 1), 0, [this] {
+            mLockInput = false;
+        });
     });
-
-    // if (transition_style == "fade") {
-    //     // Fade out, launch game, fade back in.
-    //     auto fadeFunc = [this](float t) {
-    //         mFadeOpacity = Math::lerp(0.0f, 1.0f, t);
-    //     };
-    //     setAnimation(new LambdaAnimation(fadeFunc, 800), 0, [this, game, fadeFunc] {
-    //         game->launchGame(mWindow);
-    //         setAnimation(new LambdaAnimation(fadeFunc, 800), 0, [this] {
-    //                     mLockInput = false; }, true);
-    //         this->onFileChanged(game, FILE_METADATA_CHANGED);
-    //         if (mCurrentView)
-    //             mCurrentView->onShow();
-    //     });
-    // }
-    // else if (transition_style == "slide") {
-    //     // Move camera to zoom in on center + fade out, launch game, come back in.
-    //     setAnimation(new LaunchAnimation(mCamera, mFadeOpacity, center, 1500), 0,
-    //             [this, origCamera, center, game] {
-    //         game->launchGame(mWindow);
-    //         mCamera = origCamera;
-    //         setAnimation(new LaunchAnimation(mCamera, mFadeOpacity, center, 600), 0, [this] {
-    //                     mLockInput = false; }, true);
-    //         this->onFileChanged(game, FILE_METADATA_CHANGED);
-    //         if (mCurrentView)
-    //             mCurrentView->onShow();
-    //     });
-    // }
-    // // Instant
-    // else {
-    //     setAnimation(new LaunchAnimation(mCamera, mFadeOpacity, center, 10), 0,
-    //             [this, origCamera, center, game] {
-    //         game->launchGame(mWindow);
-    //         mCamera = origCamera;
-    //         setAnimation(new LaunchAnimation(mCamera, mFadeOpacity, center, 10), 0,
-    //                 [this] { mLockInput = false; }, true);
-    //         this->onFileChanged(game, FILE_METADATA_CHANGED);
-    //         if (mCurrentView)
-    //             mCurrentView->onShow();
-    //     });
-    // }
 }
 
 void ViewController::removeGameListView(SystemData* system)
@@ -344,46 +347,46 @@ void ViewController::removeGameListView(SystemData* system)
 
 std::shared_ptr<IGameListView> ViewController::getGameListView(SystemData* system)
 {
-    // If we already made one, return that one.
+    // If we have already created an entry for this system, then return that one.
     auto exists = mGameListViews.find(system);
     if (exists != mGameListViews.cend())
         return exists->second;
 
     system->getIndex()->setUIModeFilters();
-    // If we didn't, make it, remember it, and return it.
+    // If there's no entry, then create it and return it.
     std::shared_ptr<IGameListView> view;
 
     bool themeHasVideoView = system->getTheme()->hasView("video");
 
-    // Decide type.
+    // Decide which view style to use.
-    GameListViewType selectedViewType = AUTOMATIC;
+    GameListViewType selectedViewStyle = AUTOMATIC;
 
     std::string viewPreference = Settings::getInstance()->getString("GamelistViewStyle");
     if (viewPreference.compare("basic") == 0)
-        selectedViewType = BASIC;
+        selectedViewStyle = BASIC;
     if (viewPreference.compare("detailed") == 0)
-        selectedViewType = DETAILED;
+        selectedViewStyle = DETAILED;
     if (viewPreference.compare("grid") == 0)
-        selectedViewType = GRID;
+        selectedViewStyle = GRID;
     if (viewPreference.compare("video") == 0)
-        selectedViewType = VIDEO;
+        selectedViewStyle = VIDEO;
 
-    if (selectedViewType == AUTOMATIC) {
+    if (selectedViewStyle == AUTOMATIC) {
         std::vector<FileData*> files = system->getRootFolder()->getFilesRecursive(GAME | FOLDER);
         for (auto it = files.cbegin(); it != files.cend(); it++) {
             if (themeHasVideoView && !(*it)->getVideoPath().empty()) {
-                selectedViewType = VIDEO;
+                selectedViewStyle = VIDEO;
                 break;
             }
             else if (!(*it)->getImagePath().empty()) {
-                selectedViewType = DETAILED;
+                selectedViewStyle = DETAILED;
                 // Don't break out in case any subsequent files have videos.
             }
         }
     }
 
     // Create the view.
-    switch (selectedViewType)
+    switch (selectedViewStyle)
     {
         case VIDEO:
             view = std::shared_ptr<IGameListView>(
@@ -407,9 +410,10 @@ std::shared_ptr<IGameListView> ViewController::getGameListView(SystemData* syste
     view->setTheme(system->getTheme());
 
     std::vector<SystemData*>& sysVec = SystemData::sSystemVector;
-    int id = (int)(std::find(sysVec.cbegin(), sysVec.cend(), system) - sysVec.cbegin());
+    int id = static_cast<int>(
-    view->setPosition(id * (float)Renderer::getScreenWidth(),
+            std::find(sysVec.cbegin(), sysVec.cend(), system) - sysVec.cbegin());
-            (float)Renderer::getScreenHeight() * 2);
+    view->setPosition(id * static_cast<float>(Renderer::getScreenWidth()),
+            static_cast<float>(Renderer::getScreenHeight() * 2));
 
     addChild(view.get());
 
@@ -419,13 +423,13 @@ std::shared_ptr<IGameListView> ViewController::getGameListView(SystemData* syste
 
 std::shared_ptr<SystemView> ViewController::getSystemListView()
 {
-    // If we already made one, return that one.
+    // If we have already created a system view entry, then return it.
     if (mSystemListView)
         return mSystemListView;
 
     mSystemListView = std::shared_ptr<SystemView>(new SystemView(mWindow));
     addChild(mSystemListView.get());
-    mSystemListView->setPosition(0, (float)Renderer::getScreenHeight());
+    mSystemListView->setPosition(0, static_cast<float>(Renderer::getScreenHeight()));
     return mSystemListView;
 }
 
@@ -447,7 +451,7 @@ bool ViewController::input(InputConfig* config, Input input)
     }
     #endif
 
-    // Open menu.
+    // Open the main menu.
     if (!(UIModeController::getInstance()->isUIModeKid() &&
             !Settings::getInstance()->getBool("ShowKidStartMenu")) &&
             config->isMappedTo("start", input) && input.value != 0) {
@@ -461,8 +465,9 @@ bool ViewController::input(InputConfig* config, Input input)
             mSystemListView->finishAnimation(0);
         // Stop the gamelist scrolling as well as it would otherwise
         // also continue to run after closing the menu.
-        if (mCurrentView->isListScrolling())
         mCurrentView->stopListScrolling();
+        // Finally, if the camera is currently moving, reset its position.
+        resetMovingCamera();
 
         mWindow->pushGui(new GuiMenu(mWindow));
         return true;
@@ -494,17 +499,23 @@ void ViewController::render(const Transform4x4f& parentTrans)
 
     // Camera position, position + size.
     Vector3f viewStart = transInverse.translation();
-    Vector3f viewEnd = transInverse * Vector3f((float)Renderer::getScreenWidth(),
+    Vector3f viewEnd = transInverse * Vector3f(static_cast<float>(Renderer::getScreenWidth()),
-            (float)Renderer::getScreenHeight(), 0);
+            static_cast<float>(Renderer::getScreenHeight(), 0));
 
     // Keep track of UI mode changes.
     UIModeController::getInstance()->monitorUIMode();
 
-    // Draw system view.
+    // Draw the system view if it's flagged to be rendered.
+    // If the camera is moving, we're transitioning and in that case render it regardless
+    // of whether it's flagged for rendering or not. (Otherwise there will be a black portion
+    // shown on the screen during the animation).
+    if (getSystemListView()->getRenderView() || isCameraMoving())
         getSystemListView()->render(trans);
 
-    // Draw gamelists.
+    // Draw the gamelists.
     for (auto it = mGameListViews.cbegin(); it != mGameListViews.cend(); it++) {
+        // Same thing as for the system view, limit the rendering only to what needs to be drawn.
+        if (it->second->getRenderView() || isCameraMoving()) {
             // Clipping.
             Vector3f guiStart = it->second->getPosition();
             Vector3f guiEnd = it->second->getPosition() + Vector3f(it->second->getSize().x(),
@@ -514,13 +525,14 @@ void ViewController::render(const Transform4x4f& parentTrans)
                     guiStart.x() <= viewEnd.x() && guiStart.y() <= viewEnd.y())
                 it->second->render(trans);
         }
+    }
 
     if (mWindow->peekGui() == this)
         mWindow->renderHelpPromptsEarly();
 
     // Fade out.
     if (mFadeOpacity) {
-        unsigned int fadeColor = 0x00000000 | (unsigned char)(mFadeOpacity * 255);
+        unsigned int fadeColor = 0x00000000 | static_cast<unsigned char>(mFadeOpacity * 255);
         Renderer::setMatrix(parentTrans);
         Renderer::drawRect(0.0f, 0.0f, Renderer::getScreenWidth(),
                 Renderer::getScreenHeight(), fadeColor, fadeColor);
@@ -529,23 +541,21 @@ void ViewController::render(const Transform4x4f& parentTrans)
 
 void ViewController::preload()
 {
-    uint32_t i = 0;
+    unsigned int systemCount = SystemData::sSystemVector.size();
+
     for (auto it = SystemData::sSystemVector.cbegin();
-            it != SystemData::sSystemVector.cend(); it++) {
+            it != SystemData::sSystemVector.cend(); it ++) {
         if (Settings::getInstance()->getBool("SplashScreen") &&
                 Settings::getInstance()->getBool("SplashScreenProgress")) {
-            i++;
+            mWindow->renderLoadingScreen("Loading '" + (*it)->getFullName() + "' (" +
-            char buffer[100];
+                    std::to_string(std::distance(SystemData::sSystemVector.cbegin(), it)+1) +
-            sprintf (buffer, "Loading '%s' (%d/%d)",
+                    "/" + std::to_string(systemCount) + ")");
-                (*it)->getFullName().c_str(), i, (int)SystemData::sSystemVector.size());
-            mWindow->renderLoadingScreen(std::string(buffer));
         }
-
         (*it)->getIndex()->resetFilters();
         getGameListView(*it);
     }
     // Load navigation sounds, but only if at least one system exists.
-    if (SystemData::sSystemVector.size() > 0)
+    if (systemCount > 0)
         NavigationSounds::getInstance()->loadThemeNavigationSounds(
                 SystemData::sSystemVector.front()->getTheme());
 }
@@ -587,8 +597,10 @@ void ViewController::reloadGameListView(IGameListView* view, bool reloadTheme)
     #endif
 
     // Redisplay the current view.
-    if (mCurrentView)
+    if (mCurrentView) {
         mCurrentView->onShow();
+        mCurrentView->setRenderView(true);
+    }
 }
 
 void ViewController::reloadAll()
@@ -630,6 +642,8 @@ void ViewController::reloadAll()
     NavigationSounds::getInstance()->loadThemeNavigationSounds(
             SystemData::sSystemVector.front()->getTheme());
 
+    mCurrentView->onShow();
+    mCurrentView->setRenderView(true);
     updateHelpPrompts();
 }
 

es-app/src/views/ViewController.h

@@ -1,4 +1,6 @@
+//  SPDX-License-Identifier: MIT
 //
+//  EmulationStation Desktop Edition
 //  ViewController.h
 //
 //  Handles overall system navigation including animations and transitions.
@@ -7,13 +9,13 @@
 //  Initiates the launching of games, calling FileData to do the actual launch.
 //
 
-#pragma once
 #ifndef ES_APP_VIEWS_VIEW_CONTROLLER_H
 #define ES_APP_VIEWS_VIEW_CONTROLLER_H
 
 #include "renderers/Renderer.h"
 #include "FileData.h"
 #include "GuiComponent.h"
+
 #include <vector>
 
 class IGameListView;
@@ -51,10 +53,13 @@ public:
     void goToStart();
     void ReloadAndGoToStart();
 
+    // Functions to make the GUI behave properly.
+    bool isCameraMoving();
+    void resetMovingCamera();
+    void stopScrolling();
+
     void onFileChanged(FileData* file, FileChangeType change);
 
-    // Plays a nice launch effect and launches the game at the end of it.
-    // Once the game terminates, plays a return effect.
     void launch(FileData* game, Vector3f centerCameraOn =
             Vector3f(Renderer::getScreenWidth() / 2.0f, Renderer::getScreenHeight() / 2.0f, 0));
 

es-app/src/views/gamelist/IGameListView.cpp

@@ -1,4 +1,6 @@
+//  SPDX-License-Identifier: MIT
 //
+//  EmulationStation Desktop Edition
 //  IGameListView.cpp
 //
 //  Interface that defines the minimum for a GameListView.
@@ -17,7 +19,7 @@ bool IGameListView::input(InputConfig* config, Input input)
     // Select button opens GuiGamelistOptions.
     if (!UIModeController::getInstance()->isUIModeKid() &&
             config->isMappedTo("select", input) && input.value) {
-        if (isListScrolling())
+        ViewController::get()->resetMovingCamera();
         stopListScrolling();
         mWindow->pushGui(new GuiGamelistOptions(mWindow, this->mRoot->getSystem()));
         return true;
@@ -56,10 +58,10 @@ void IGameListView::render(const Transform4x4f& parentTrans)
     float scaleX = trans.r0().x();
     float scaleY = trans.r1().y();
 
-    Vector2i pos((int)Math::round(trans.translation()[0]),
+    Vector2i pos(static_cast<int>(Math::round(trans.translation()[0])),
-            (int)Math::round(trans.translation()[1]));
+            static_cast<int>(Math::round(trans.translation()[1])));
-    Vector2i size((int)Math::round(mSize.x() * scaleX),
+    Vector2i size(static_cast<int>(Math::round(mSize.x() * scaleX)),
-            (int)Math::round(mSize.y() * scaleY));
+            static_cast<int>(Math::round(mSize.y() * scaleY)));
 
     Renderer::pushClipRect(pos, size);
     renderChildren(trans);

es-app/src/views/gamelist/IGameListView.h

@@ -1,10 +1,11 @@
+//  SPDX-License-Identifier: MIT
 //
+//  EmulationStation Desktop Edition
 //  IGameListView.h
 //
 //  Interface that defines the minimum for a GameListView.
 //
 
-#pragma once
 #ifndef ES_APP_VIEWS_GAME_LIST_IGAME_LIST_VIEW_H
 #define ES_APP_VIEWS_GAME_LIST_IGAME_LIST_VIEW_H
 
@@ -24,15 +25,15 @@ public:
             FileData* root)
             : GuiComponent(window),
             mRoot(root)
-            { setSize((float)Renderer::getScreenWidth(),
+            { setSize(static_cast<float>(Renderer::getScreenWidth()),
-            (float)Renderer::getScreenHeight()); }
+            static_cast<float>(Renderer::getScreenHeight())); }
 
     virtual ~IGameListView() {}
 
     // Called when a new file is added, a file is removed, a file's metadata changes,
     // or a file's children are sorted.
-    // NOTE: FILE_SORTED is only reported for the topmost FileData, where the sort started.
+    // Note: FILE_SORTED is only reported for the topmost FileData, where the sort started.
-    //       Since sorts are recursive, that FileData's children probably changed too.
+    // Since sorts are recursive, FileData's children probably changed too.
     virtual void onFileChanged(FileData* file, FileChangeType change) = 0;
 
     // Called whenever the theme changes.

es-app/src/views/gamelist/ISimpleGameListView.cpp

@@ -1,7 +1,9 @@
+//  SPDX-License-Identifier: MIT
 //
+//  EmulationStation Desktop Edition
 //  ISimpleGameListView.cpp
 //
-//  Interface that defines a simple GameListView.
+//  Interface that defines a simple gamelist view.
 //
 
 #include "views/gamelist/ISimpleGameListView.h"
@@ -101,13 +103,14 @@ bool ISimpleGameListView::input(InputConfig* config, Input input)
         if (config->isMappedTo("a", input)) {
             FileData* cursor = getCursor();
             if (cursor->getType() == GAME) {
-                if (isListScrolling())
+                ViewController::get()->resetMovingCamera();
                 stopListScrolling();
                 launch(cursor);
             }
             else {
                 // It's a folder.
                 if (cursor->getChildren().size() > 0) {
+                    ViewController::get()->resetMovingCamera();
                     NavigationSounds::getInstance()->playThemeNavigationSound(SELECTSOUND);
                     mCursorStack.push(cursor);
                     populateList(cursor->getChildrenListToDisplay());
@@ -119,6 +122,7 @@ bool ISimpleGameListView::input(InputConfig* config, Input input)
             return true;
         }
         else if (config->isMappedTo("b", input)) {
+            ViewController::get()->resetMovingCamera();
             if (mCursorStack.size()) {
                 NavigationSounds::getInstance()->playThemeNavigationSound(BACKSOUND);
                 populateList(mCursorStack.top()->getParent()->getChildren());
@@ -128,7 +132,6 @@ bool ISimpleGameListView::input(InputConfig* config, Input input)
             else {
                 NavigationSounds::getInstance()->playThemeNavigationSound(BACKSOUND);
                 onFocusLost();
-                if (isListScrolling())
                 stopListScrolling();
                 SystemData* systemToView = getCursor()->getSystem();
                 if (systemToView->isCollection())
@@ -142,7 +145,6 @@ bool ISimpleGameListView::input(InputConfig* config, Input input)
         else if (config->isMappedLike(getQuickSystemSelectRightButton(), input)) {
             if (Settings::getInstance()->getBool("QuickSystemSelect")) {
                 onFocusLost();
-                if (isListScrolling())
                 stopListScrolling();
                 ViewController::get()->goToNextGameList();
                 return true;
@@ -151,7 +153,6 @@ bool ISimpleGameListView::input(InputConfig* config, Input input)
         else if (config->isMappedLike(getQuickSystemSelectLeftButton(), input)) {
             if (Settings::getInstance()->getBool("QuickSystemSelect")) {
                 onFocusLost();
-                if (isListScrolling())
                 stopListScrolling();
                 ViewController::get()->goToPrevGameList();
                 return true;
@@ -159,7 +160,6 @@ bool ISimpleGameListView::input(InputConfig* config, Input input)
         }
         else if (config->isMappedTo("x", input)) {
             if (mRoot->getSystem()->isGameSystem() && getCursor()->getType() != PLACEHOLDER) {
-                if (isListScrolling())
                 stopListScrolling();
                 // Go to random system game.
                 NavigationSounds::getInstance()->playThemeNavigationSound(SCROLLSOUND);
@@ -182,7 +182,6 @@ bool ISimpleGameListView::input(InputConfig* config, Input input)
             if (mRoot->getSystem()->isGameSystem()) {
                 if (getCursor()->getType() == GAME || getCursor()->getType() == FOLDER)
                     NavigationSounds::getInstance()->playThemeNavigationSound(FAVORITESOUND);
-
                 // Marking folders as favorites is only cosmetic as they're not sorted
                 // differently and they're not part of any collections. So it makes more
                 // sense to do it here than to add the function to CollectionSystemManager.

es-app/src/views/gamelist/ISimpleGameListView.h

@@ -1,16 +1,18 @@
+//  SPDX-License-Identifier: MIT
 //
+//  EmulationStation Desktop Edition
 //  ISimpleGameListView.h
 //
-//  Interface that defines a simple GameListView.
+//  Interface that defines a simple gamelist view.
 //
 
-#pragma once
 #ifndef ES_APP_VIEWS_GAME_LIST_ISIMPLE_GAME_LIST_VIEW_H
 #define ES_APP_VIEWS_GAME_LIST_ISIMPLE_GAME_LIST_VIEW_H
 
 #include "components/ImageComponent.h"
 #include "components/TextComponent.h"
 #include "views/gamelist/IGameListView.h"
+
 #include <stack>
 
 class ISimpleGameListView : public IGameListView
@@ -21,8 +23,8 @@ public:
 
     // Called when a new file is added, a file is removed, a file's metadata changes,
     // or a file's children are sorted.
-    // NOTE: FILE_SORTED is only reported for the topmost FileData, where the sort started.
+    // Note: FILE_SORTED is only reported for the topmost FileData, where the sort started.
-    // Since sorts are recursive, that FileData's children probably changed too.
+    // Since sorts are recursive, FileData's children probably changed too.
     virtual void onFileChanged(FileData* file, FileChangeType change) override;
 
     // Called whenever the theme changes.

es-core/src/GuiComponent.cpp

@@ -1,4 +1,6 @@
+//  SPDX-License-Identifier: MIT
 //
+//  EmulationStation Desktop Edition
 //  GuiComponent.cpp
 //
 //  Basic GUI component handling such as placement, rotation, Z-order, rendering and animation.
@@ -12,6 +14,7 @@
 #include "Log.h"
 #include "ThemeData.h"
 #include "Window.h"
+
 #include <algorithm>
 
 GuiComponent::GuiComponent(Window* window)
@@ -26,7 +29,8 @@ GuiComponent::GuiComponent(Window* window)
         mTransform(Transform4x4f::Identity()),
         mIsProcessing(false),
         mVisible(true),
-        mEnabled(true)
+        mEnabled(true),
+        mRenderView(false)
 {
     for (unsigned char i = 0; i < MAX_ANIMATIONS; i++)
         mAnimationMap[i] = nullptr;
@@ -230,7 +234,7 @@ void GuiComponent::sortChildren()
 
 unsigned int GuiComponent::getChildCount() const
 {
-    return (int)mChildren.size();
+    return static_cast<int>(mChildren.size());
 }
 
 GuiComponent* GuiComponent::getChild(unsigned int i) const
@@ -437,7 +441,8 @@ void GuiComponent::applyTheme(const std::shared_ptr<ThemeData>& theme,
         const std::string& view, const std::string& element, unsigned int properties)
 {
     Vector2f scale = getParent() ? getParent()->getSize()
-            : Vector2f((float)Renderer::getScreenWidth(), (float)Renderer::getScreenHeight());
+            : Vector2f(static_cast<float>(Renderer::getScreenWidth()),
+            static_cast<float>(Renderer::getScreenHeight()));
 
     const ThemeData::ThemeElement* elem = theme->getElement(view, element, "");
     if (!elem)
@@ -511,6 +516,12 @@ void GuiComponent::onHide()
         getChild(i)->onHide();
 }
 
+void GuiComponent::onPauseVideo()
+{
+    for (unsigned int i = 0; i < getChildCount(); i++)
+        getChild(i)->onPauseVideo();
+}
+
 void GuiComponent::onScreenSaverActivate()
 {
     for (unsigned int i = 0; i < getChildCount(); i++)

es-core/src/GuiComponent.h

@@ -1,4 +1,6 @@
+//  SPDX-License-Identifier: MIT
 //
+//  EmulationStation Desktop Edition
 //  GuiComponent.h
 //
 //  Basic GUI component handling such as placement, rotation, Z-order, rendering and animation.
@@ -91,7 +93,8 @@ public:
 
     float getRotation() const;
     void setRotation(float rotation);
-    inline void setRotationDegrees(float rotation) { setRotation((float)ES_DEG_TO_RAD(rotation)); }
+    inline void setRotationDegrees(float rotation) {
+            setRotation(static_cast<float>(ES_DEG_TO_RAD(rotation))); }
 
     float getScale() const;
     void setScale(float scale);
@@ -163,6 +166,9 @@ public:
 
     virtual void onShow();
     virtual void onHide();
+    virtual void onPauseVideo();
+    virtual void setRenderView(bool status) { mRenderView = status; }
+    virtual bool getRenderView() { return mRenderView; };
 
     virtual void onScreenSaverActivate();
     virtual void onScreenSaverDeactivate();
@@ -221,6 +227,7 @@ protected:
     bool mIsProcessing;
     bool mVisible;
     bool mEnabled;
+    bool mRenderView;
 
 private:
     // Don't access this directly! Use getTransform()!

es-core/src/components/VideoComponent.cpp

@@ -1,4 +1,6 @@
+//  SPDX-License-Identifier: MIT
 //
+//  EmulationStation Desktop Edition
 //  VideoComponent.cpp
 //
 //  Base class for playing videos.
@@ -67,10 +69,11 @@ VideoComponent::VideoComponent(
     mIsPlaying(false),
     mPause(false),
     mShowing(false),
-    mScreensaverActive(false),
-    mGameLaunched(false),
     mDisable(false),
+    mScreensaverActive(false),
     mScreensaverMode(false),
+    mGameLaunched(false),
+    mBlockPlayer(false),
     mTargetIsMax(false),
     mTargetSize(0, 0)
 {
@@ -236,6 +239,9 @@ std::vector<HelpPrompt> VideoComponent::getHelpPrompts()
 
 void VideoComponent::handleStartDelay()
 {
+    if (mBlockPlayer)
+        return;
+
     // Only play if any delay has timed out.
     if (mStartDelayed) {
         // If the setting to override the theme-supplied video delay setting has been enabled,
@@ -284,6 +290,11 @@ void VideoComponent::startVideoWithDelay()
 
 void VideoComponent::update(int deltaTime)
 {
+    if (mBlockPlayer) {
+        setImage(mStaticImagePath);
+        return;
+    }
+
     manageState();
 
     // If the video start is delayed and there is less than the fade time, then set
@@ -340,6 +351,8 @@ void VideoComponent::manageState()
 
 void VideoComponent::onShow()
 {
+    mBlockPlayer = false;
+    mPause = false;
     mShowing = true;
     manageState();
 }
@@ -350,6 +363,13 @@ void VideoComponent::onHide()
     manageState();
 }
 
+void VideoComponent::onPauseVideo()
+{
+    mBlockPlayer = true;
+    mPause = true;
+    manageState();
+}
+
 void VideoComponent::onScreenSaverActivate()
 {
     mScreensaverActive = true;

es-core/src/components/VideoComponent.h

@@ -1,10 +1,11 @@
+//  SPDX-License-Identifier: MIT
 //
+//  EmulationStation Desktop Edition
 //  VideoComponent.h
 //
 //  Base class for playing videos.
 //
 
-#pragma once
 #ifndef ES_CORE_COMPONENTS_VIDEO_COMPONENT_H
 #define ES_CORE_COMPONENTS_VIDEO_COMPONENT_H
 
@@ -46,6 +47,7 @@ public:
 
     virtual void onShow() override;
     virtual void onHide() override;
+    virtual void onPauseVideo() override;
     virtual void onScreenSaverActivate() override;
     virtual void onScreenSaverDeactivate() override;
     virtual void onGameLaunchedActivate() override;
@@ -110,8 +112,8 @@ protected:
 
     std::string mVideoPath;
     std::string mPlayingVideoPath;
-    bool mStartDelayed;
     unsigned mStartTime;
+    bool mStartDelayed;
     bool mIsPlaying;
     bool mPause;
     bool mShowing;
@@ -119,6 +121,7 @@ protected:
     bool mScreensaverActive;
     bool mScreensaverMode;
     bool mGameLaunched;
+    bool mBlockPlayer;
     bool mTargetIsMax;
 
     Configuration mConfig;