How can I add “virtual assets” to content browser?
For example, I have a file in content browser with extension .css, how do I tell the content browser about it?
How to display the icon and the name of asset in Editor WITHOUT creating respective .uasset file (this is important).
I know that Content Browser supports uassets and umaps. And I know that assets are shown when they are deserialized and the engine extracts all the information.
I need a solution without compiling the entire engine.
I wrote something, assets appear, but are not deleted if I delete .css files.
FDelegateHandle FCustomAssetManager::WatcherHandle = FDelegateHandle();
void FCustomAssetManager::Initialize()
{
WatchDirectory = FPaths::ProjectContentDir();
FDirectoryWatcherModule& DirectoryWatcher = FModuleManager::LoadModuleChecked<FDirectoryWatcherModule>("DirectoryWatcher");
DirectoryWatcher.Get()->RegisterDirectoryChangedCallback_Handle(
WatchDirectory,
IDirectoryWatcher::FDirectoryChanged::CreateRaw(this, &FCustomAssetManager::ScanForCSSFiles),
FCustomAssetManager::WatcherHandle,
IDirectoryWatcher::WatchOptions::IncludeDirectoryChanges
);
}
void FCustomAssetManager::Shutdown()
{
if (FModuleManager::Get().IsModuleLoaded("DirectoryWatcher"))
{
FDirectoryWatcherModule& DirectoryWatcher = FModuleManager::LoadModuleChecked<FDirectoryWatcherModule>("DirectoryWatcher");
DirectoryWatcher.Get()->UnregisterDirectoryChangedCallback_Handle(WatchDirectory, OnDirectoryChangedHandle);
}
}
void FCustomAssetManager::ScanForCSSFiles(const TArray<FFileChangeData> & Data)
{
if (Data.Num() == 0)
return;
for (FFileChangeData File : Data)
{
if (FPaths::GetExtension(File.Filename) != "css")
continue;
FContentBrowserModule& ContentBrowserModule = FModuleManager::LoadModuleChecked<FContentBrowserModule>("ContentBrowser");
IContentBrowserSingleton& ContentBrowserSingleton = ContentBrowserModule.Get();
IAssetRegistry& AssetRegistry = FModuleManager::LoadModuleChecked<FAssetRegistryModule>("AssetRegistry").Get();
FAssetData VirtualAsset(
FName(FPaths::GetBaseFilename(File.Filename)),
FName("/Game"),
FName(FPaths::GetBaseFilename(File.Filename)),
FName("CSS")
);
FAssetRegistryState AssetRegistryState = FAssetRegistryState();
if (File.Action == FFileChangeData::FCA_Removed)
{
bool bDummy;
AssetRegistryState.RemoveAssetData(&VirtualAsset, false, bDummy, bDummy);
AssetRegistry.AppendState(AssetRegistryState);
}
else if (File.Action == FFileChangeData::FCA_Added)
{
AssetRegistryState.AddAssetData(&VirtualAsset);
AssetRegistry.AppendState(AssetRegistryState);
}
}
}
