iOS file picker, ImGui drag scroll & more

src/dusk/file_select.cpp

@@ -0,0 +1,91 @@
+#include "file_select.hpp"
+
+#include <memory>
+
+#include <SDL3/SDL_dialog.h>
+#include <SDL3/SDL_error.h>
+
+#if defined(__APPLE__)
+#include <TargetConditionals.h>
+#endif
+
+#if defined(__APPLE__) && TARGET_OS_IOS && !TARGET_OS_MACCATALYST
+#define USE_IOS_DIALOG 1
+#include "ios/FileSelectDialog.h"
+#else
+#define USE_IOS_DIALOG 0
+#endif
+
+namespace dusk {
+namespace {
+
+#if USE_IOS_DIALOG
+struct IOSDialogCallbackState {
+    FileCallback callback;
+    void* userdata;
+};
+
+void onIOSDialogFinished(void* userdata, const char* path, const char* error) {
+    std::unique_ptr<IOSDialogCallbackState> state(static_cast<IOSDialogCallbackState*>(userdata));
+
+    if (error != nullptr) {
+        state->callback(state->userdata, nullptr, error);
+        return;
+    }
+
+    if (path == nullptr) {
+        state->callback(state->userdata, nullptr, nullptr);
+        return;
+    }
+
+    state->callback(state->userdata, path, nullptr);
+}
+#else
+struct SDLDialogCallbackState {
+    FileCallback callback;
+    void* userdata;
+};
+
+void onSDLDialogFinished(void* userdata, const char* const* filelist, [[maybe_unused]] int filter) {
+    std::unique_ptr<SDLDialogCallbackState> state(static_cast<SDLDialogCallbackState*>(userdata));
+
+    if (filelist == nullptr) {
+        state->callback(state->userdata, nullptr, SDL_GetError());
+        return;
+    }
+
+    if (filelist[0] == nullptr) {
+        state->callback(state->userdata, nullptr, nullptr);
+        return;
+    }
+
+    state->callback(state->userdata, filelist[0], nullptr);
+}
+#endif
+
+}  // namespace
+
+void ShowFileSelect(FileCallback callback, void* userdata, SDL_Window* window,
+                    const SDL_DialogFileFilter* filters, int nfilters, const char* default_location,
+                    bool allow_many) {
+    if (callback == nullptr) {
+        return;
+    }
+
+#if USE_IOS_DIALOG
+    auto state = std::make_unique<IOSDialogCallbackState>();
+    state->callback = callback;
+    state->userdata = userdata;
+
+    Dusk_iOS_ShowFileSelect(&onIOSDialogFinished, state.release(), window, filters, nfilters,
+                            default_location, allow_many);
+#else
+    auto state = std::make_unique<SDLDialogCallbackState>();
+    state->callback = callback;
+    state->userdata = userdata;
+
+    SDL_ShowOpenFileDialog(&onSDLDialogFinished, state.release(), window, filters, nfilters,
+                           default_location, allow_many);
+#endif
+}
+}  // namespace dusk