Plan cloud browse decisions in app core

src/app_cloud.cpp

@@ -83,8 +83,14 @@ void App::cloud_upload_all()
 
 void App::cloud_browse()
 {
-    if (!canvas)
+    const auto browse_plan = pp::app::plan_cloud_browse(canvas != nullptr);
+    switch (browse_plan)
+    {
+    case pp::app::CloudBrowseAction::unavailable_no_canvas:
         return;
+    case pp::app::CloudBrowseAction::show_browser:
+        break;
+    }
 
     // load thumbnail test
     auto dialog = std::make_shared<NodeDialogCloud>();
@@ -97,7 +103,8 @@ void App::cloud_browse()
 
     dialog->btn_ok->on_click = [this, dialog](Node*)
     {
-        if (dialog->selected_file.empty())
+        const auto selection_plan = pp::app::plan_cloud_download_selection(dialog->selected_file);
+        if (selection_plan == pp::app::CloudDownloadSelectionAction::wait_for_selection)
             return;
         dialog->destroy();
         std::thread([this, dialog] {

src/app_core/document_cloud.h

@@ -1,5 +1,7 @@
 #pragma once
 
+#include <string_view>
+
 namespace pp::app {
 
 enum class CloudUploadAction {
@@ -8,6 +10,16 @@ enum class CloudUploadAction {
     prompt_publish,
 };
 
+enum class CloudBrowseAction {
+    unavailable_no_canvas,
+    show_browser,
+};
+
+enum class CloudDownloadSelectionAction {
+    wait_for_selection,
+    start_download,
+};
+
 struct CloudUploadPlan {
     CloudUploadAction action = CloudUploadAction::unavailable_no_canvas;
     bool save_before_upload = false;
@@ -29,4 +41,19 @@ struct CloudUploadPlan {
     return { CloudUploadAction::prompt_publish, has_unsaved_changes };
 }
 
+[[nodiscard]] constexpr CloudBrowseAction plan_cloud_browse(bool has_canvas) noexcept
+{
+    return has_canvas
+        ? CloudBrowseAction::show_browser
+        : CloudBrowseAction::unavailable_no_canvas;
+}
+
+[[nodiscard]] constexpr CloudDownloadSelectionAction plan_cloud_download_selection(
+    std::string_view selected_file) noexcept
+{
+    return selected_file.empty()
+        ? CloudDownloadSelectionAction::wait_for_selection
+        : CloudDownloadSelectionAction::start_download;
+}
+
 }