Ken Van Hoeylandt
117 lines
4.0 KiB
C++
117 lines
4.0 KiB
C++
#include "Tactility/app/fileselection/FileSelectionPrivate.h"
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#include "Tactility/app/fileselection/View.h"
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#include "Tactility/app/fileselection/State.h"
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#include <app/event.h>
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#include <app/manager.h>
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#include <app/manifest.h>
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#include <lvgl_window_manager/window_manager.h>
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#include <memory>
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#include <string>
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namespace tt::app::fileselection {
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extern const ::AppManifest manifest;
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constexpr auto* TAG = "FileSelection";
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namespace {
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struct Context {
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uint32_t appInstanceId;
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Mode mode;
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std::shared_ptr<State> state;
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std::unique_ptr<View> view;
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// The eventual appMain() return value - see AlertDialog.cpp's Context::result for why this
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// is a plain (non-atomic) field safely shared between the LVGL thread (writer, before
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// emitting APP_EVENT_CLOSE) and this app's own thread (reader, after waking from it).
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int32_t result = 1; // Cancelled - safety-net default if closed without picking a file
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};
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// The last picked path. Static rather than per-instance: simple, and in practice only one
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// FileSelection dialog is ever open at a time. Written on the LVGL thread (View's select-button
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// callback, before emitting APP_EVENT_CLOSE); read by the parent via getLastPath() after
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// receiving that event - safe without a lock for the same reason Context::result is (see
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// AlertDialog.cpp).
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std::string lastPath;
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void createWidgets(lv_obj_t* parent, void* userData) {
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auto* ctx = static_cast<Context*>(userData);
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ctx->view->init(parent, ctx->mode);
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}
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int32_t appMain(uint32_t appInstanceId, int argc, char* argv[]) {
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// argv layout: [0]="existing" or "existing_or_new".
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Context ctx {};
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ctx.appInstanceId = appInstanceId;
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ctx.mode = (argc > 0 && std::string(argv[0]) == "existing_or_new") ? Mode::ExistingOrNew : Mode::Existing;
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ctx.state = std::make_shared<State>();
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ctx.view = std::make_unique<View>(appInstanceId, ctx.state, [&ctx, appInstanceId](const std::string& path) {
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// Runs on the LVGL task (View::onSelectButtonPressed) - must NOT call app_manager_stop()
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// here: that bound-waits (thread_join) for this app's own thread to finish, which needs
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// the LVGL lock (window_manager_remove()) - but this callback runs ON the LVGL task,
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// which would deadlock against itself. The caller reaps this instance via
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// app_manager_stop() after it receives the APP_EVENT_RESULT instead.
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lastPath = path;
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ctx.result = 0;
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AppEvent closeEvent { .type = APP_EVENT_CLOSE, .timestamp = 0, .result = {} };
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app_event_emit(appInstanceId, &closeEvent);
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});
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AppEventSubscription sub {};
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sub.app_instance_id = appInstanceId;
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app_event_subscribe(&sub);
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WindowId window = window_manager_create(appInstanceId, createWidgets, &ctx);
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while (true) {
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AppEvent event {};
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if (app_event_await(&sub, &event, portMAX_DELAY) != ERROR_NONE) {
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break;
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}
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if (event.type == APP_EVENT_CLOSE) {
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app_manager_finish(appInstanceId); // no-op: modal children never supersede anything
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break;
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}
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}
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window_manager_remove(window);
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app_event_unsubscribe(&sub);
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return ctx.result;
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}
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} // namespace
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std::string getLastPath() {
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return lastPath;
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}
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uint32_t startForExistingFile(uint32_t callerAppInstanceId) {
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const char* argv[] = { "existing" };
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uint32_t instanceId = 0;
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app_manager_start_for_result(manifest.id, callerAppInstanceId, 1, argv, &instanceId);
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return instanceId;
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}
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uint32_t startForExistingOrNewFile(uint32_t callerAppInstanceId) {
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const char* argv[] = { "existing_or_new" };
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uint32_t instanceId = 0;
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app_manager_start_for_result(manifest.id, callerAppInstanceId, 1, argv, &instanceId);
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return instanceId;
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}
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extern const ::AppManifest manifest = {
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.id = "FileSelection",
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.name = "File Selection",
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.category = APP_CATEGORY_SYSTEM,
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.location = { APP_LOCATION_MEMORY, reinterpret_cast<void*>(appMain) },
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.flags = APP_MANIFEST_FLAG_HIDDEN,
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};
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} // namespace
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