Cache current file path in imgui.ini

Smertig · Nov 13, 2020 · 8727184 · 8727184
1 parent a34fafa
commit 8727184
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Showing 4 changed files with 49 additions and 4 deletions.
diff --git a/source/app.cpp b/source/app.cpp
@@ -12,12 +12,12 @@
 
 app::app(const std::string& app_name)
     : m_window(sf::VideoMode::getFullscreenModes().front(), app_name)
+    , m_imgui_inited((ImGui::SFML::Init(m_window, false), true))
     , m_camera(m_window)
     , m_ui_file_dialog([this](std::filesystem::path replay_path) { open_replay(std::move(replay_path)); })
 {
     m_window.setVerticalSyncEnabled(true);
 
-    ImGui::SFML::Init(m_window, false);
     ::init_fonts();
 }
 

diff --git a/source/app.hpp b/source/app.hpp
@@ -32,6 +32,7 @@ class app {
     };
 
     sf::RenderWindow         m_window;
+    bool                     m_imgui_inited; // small hack to init ImGui just after m_window creation
     scene::camera            m_camera;
     ui::file_dialog          m_ui_file_dialog;
     std::optional<map_state> m_current_map;

diff --git a/source/ui/file_dialog.cpp b/source/ui/file_dialog.cpp
@@ -4,6 +4,7 @@
 
 #include <fmt/format.h>
 #include <imgui.h>
+#include <imgui_internal.h>
 #include <imgui_stdlib.h>
 
 #include <fstream>
@@ -39,18 +40,22 @@ ImColor convert_color(int color_id) {
     }
 }
 
+bool starts_with(std::string_view string, std::string_view prefix) {
+    return string.length() >= prefix.length() && string.substr(0, prefix.length()) == prefix;
+}
+
 } // unnamed namespace
 
 namespace ui {
 
 file_dialog::file_dialog(std::function<void(const std::filesystem::path&)> open_file_callback)
     : m_open_file_callback(std::move(open_file_callback))
 {
-    if (try_set_path(fs::current_path()) || try_set_path(fs::temp_directory_path())) {
-        return;
+    if (!try_set_path(fs::current_path()) && !try_set_path(fs::temp_directory_path())) {
+        throw std::runtime_error("Unable to set default path");
     }
 
-    throw std::runtime_error("Unable to set default path");
+    add_settings_handler();
 }
 
 void file_dialog::update(int dt) {
@@ -208,4 +213,41 @@ void file_dialog::refresh_cache() {
     });
 }
 
+void file_dialog::add_settings_handler() {
+    ImGuiSettingsHandler ini_handler;
+
+    ini_handler.TypeName = "FileDialog";
+    ini_handler.TypeHash = ImHashStr("FileDialog");
+    ini_handler.UserData = this; // TODO:  lifetime
+
+    ini_handler.ReadOpenFn = [](ImGuiContext*, ImGuiSettingsHandler*, const char* name) -> void* {
+        static int dummy_var;
+        return &dummy_var;
+    };
+
+    ini_handler.ReadLineFn = [](ImGuiContext*, ImGuiSettingsHandler* handler, void* entry, const char* line) {
+        auto self = static_cast<file_dialog*>(handler->UserData);
+
+        auto try_extract = [line](std::string_view prefix) -> std::optional<std::string_view> {
+            if (starts_with(line, prefix)) {
+                return line + prefix.length();
+            }
+            return std::nullopt;
+        };
+
+        if (auto saved_path = try_extract("path=")) {
+            self->try_set_path(std::filesystem::path{ *saved_path, std::filesystem::path::format::generic_format });
+        }
+    };
+
+    ini_handler.WriteAllFn = [](ImGuiContext* ctx, ImGuiSettingsHandler* handler, ImGuiTextBuffer* out_buf) {
+        auto self = static_cast<file_dialog*>(handler->UserData);
+
+        out_buf->appendf("[%s][Settings]\n", handler->TypeName);
+        out_buf->appendf("path=%s\n", self->m_current_path.generic_u8string().c_str());
+    };
+
+    ImGui::GetCurrentContext()->SettingsHandlers.push_back(ini_handler);
+}
+
 } // namespace ui
diff --git a/source/ui/file_dialog.hpp b/source/ui/file_dialog.hpp
@@ -38,6 +38,8 @@ class file_dialog {
     bool try_set_path(std::filesystem::path path);
 
     void refresh_cache();
+
+    void add_settings_handler();
 };
 
 } // namespace ui