FileUtilities.cpp

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// Copyright (c) 2023 FrostBit Software Lab at the Lapland University of Applied Sciences
//
// This work is licensed under the terms of the MIT license.
// For a copy, see <https://opensource.org/licenses/MIT>.
 
#include "FileUtilities.h"
 
#include "DesktopPlatformModule.h"
#include "Misc/Paths.h"
#include "HAL/PlatformProcess.h"
 
#pragma warning (disable : 4702)
 
void UFileUtilities::OpenFileExplorer(FString Path)
{
    FString AbsolutePath = FPaths::ConvertRelativePathToFull(Path);
    if (FPaths::DirectoryExists(AbsolutePath))
    {
        FPlatformProcess::ExploreFolder(*AbsolutePath);
    }
}
 
FString UFileUtilities::OpenFileDialogReturnFirst(const FString& Path)
{
    FString File;
    TArray<FString> Files = OpenFileDialogReturnFiles(Path);
 
    if (!Files.IsEmpty())
    {
        File = Files[0];
    }
 
    return File;
}
 
TArray<FString> UFileUtilities::OpenFileDialogReturnFiles(const FString& Path)
{
    TArray<FString> OutFiles;
 
    // OpenFileDialog doesn't work in packaged builds.
#if !WITH_EDITOR
    return OutFiles;
#endif
 
    IDesktopPlatform* DesktopPlatform = FDesktopPlatformModule::Get();
    if (!DesktopPlatform)
    {
        return OutFiles;
    }
 
    FString DefaultPath = Path.IsEmpty() ? FPaths::ProjectDir() : Path;
 
    // Create a file picker dialog
    bool bOpened = DesktopPlatform->OpenFileDialog(
        nullptr,
        NSLOCTEXT("FileUtilities", "OpenFileDialog", "Choose a file").ToString(),
        DefaultPath,
        FString(),
        TEXT("All Files (*.*)|*.*"),
        EFileDialogFlags::Multiple,
        OutFiles
    );
 
    if (bOpened)
    {
        for (FString& FilePath : OutFiles)
        {
            // Convert relative path to full path
            FilePath = FPaths::ConvertRelativePathToFull(FilePath);
        }
    }
 
    return OutFiles;
}