add Open, Save calendar functionality

add path information to window title

#9

src/main_win32.cpp

@@ -22,6 +22,8 @@ static bool                     g_SwapChainOccluded = false;
 static UINT                     g_ResizeWidth = 0, g_ResizeHeight = 0;
 static ID3D11RenderTargetView*  g_mainRenderTargetView = nullptr;
 
+static HWND hwnd;
+
 // Forward declarations of helper functions
 bool CreateDeviceD3D(HWND hWnd);
 void CleanupDeviceD3D();
@@ -32,6 +34,85 @@ LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
 bool should_exit = false;
 bool show_demo_window = false;
 
+void set_window_title(const char *window_title){
+    SetWindowTextA(hwnd, window_title);
+}
+
+char *open_file_dialog() {
+
+    uint32_t file_name_buffer_size = 4096;
+    void *file_name_buffer = calloc(1, file_name_buffer_size);
+
+    OPENFILENAMEA open_info = {
+        .lStructSize = sizeof(OPENFILENAMEA),
+        .hwndOwner = hwnd,
+        .hInstance = NULL, 
+        .lpstrFilter = "Workcalendar (.wcl)\0*.wcl\0\0",
+        .lpstrCustomFilter = NULL,
+        .nMaxCustFilter = 0,
+        .nFilterIndex = 0,
+        .lpstrFile = (char *) file_name_buffer,
+        .nMaxFile = file_name_buffer_size,
+        .lpstrFileTitle = NULL,
+        .nMaxFileTitle = NULL,
+        .lpstrInitialDir = NULL,
+        .lpstrTitle = "Kalender öffnen",
+        .Flags = OFN_FILEMUSTEXIST | OFN_HIDEREADONLY | OFN_LONGNAMES ,
+        .nFileOffset = 0,
+        .nFileExtension = 0,
+        .lpstrDefExt = "wcl",
+        .lCustData = NULL,
+        .lpfnHook = NULL,
+        .lpTemplateName = NULL,
+    }; 
+
+    if(!GetOpenFileNameA(&open_info)) {
+        free(file_name_buffer);
+        return NULL;
+    }
+
+    return (char *) file_name_buffer;
+}
+
+char *save_file_dialog() {
+
+    uint32_t file_name_buffer_size = 4096;
+    void *file_name_buffer = calloc(1, file_name_buffer_size);
+    if (save_file_path) {
+        memcpy(file_name_buffer, save_file_path, strlen(save_file_path));
+    }
+
+    OPENFILENAMEA open_info = {
+        .lStructSize = sizeof(OPENFILENAMEA),
+        .hwndOwner = hwnd,
+        .hInstance = NULL, 
+        .lpstrFilter = "Workcalendar (.wcl)\0*.wcl\0\0",
+        .lpstrCustomFilter = NULL,
+        .nMaxCustFilter = 0,
+        .nFilterIndex = 0,
+        .lpstrFile = (char *) file_name_buffer,
+        .nMaxFile = file_name_buffer_size,
+        .lpstrFileTitle = NULL,
+        .nMaxFileTitle = NULL,
+        .lpstrInitialDir = NULL,
+        .lpstrTitle = "Kalender speichern unter",
+        .Flags = OFN_LONGNAMES | OFN_OVERWRITEPROMPT | OFN_PATHMUSTEXIST,
+        .nFileOffset = 0,
+        .nFileExtension = 0,
+        .lpstrDefExt = "wcl",
+        .lCustData = NULL,
+        .lpfnHook = NULL,
+        .lpTemplateName = NULL,
+    }; 
+
+    if(!GetSaveFileNameA(&open_info)) {
+        free(file_name_buffer);
+        return NULL;
+    }
+
+    return (char *) file_name_buffer;
+}
+
 // Main code
 int main(int, char**)
 {
@@ -42,7 +123,7 @@ int main(int, char**)
     // Create application window
     WNDCLASSEXW wc = { sizeof(wc), CS_CLASSDC, WndProc, 0L, 0L, GetModuleHandle(nullptr), nullptr, nullptr, nullptr, nullptr, L"ImGui Example", nullptr };
     ::RegisterClassExW(&wc);
-    HWND hwnd = ::CreateWindowW(wc.lpszClassName, L"Work Calendar", WS_OVERLAPPEDWINDOW, 100, 100, (int)(1600 * main_scale), (int)(900 * main_scale), nullptr, nullptr, wc.hInstance, nullptr);
+    hwnd = ::CreateWindowW(wc.lpszClassName, L"Work Calendar", WS_OVERLAPPEDWINDOW, 100, 100, (int)(1600 * main_scale), (int)(900 * main_scale), nullptr, nullptr, wc.hInstance, nullptr);
 
     // Initialize Direct3D
     if (!CreateDeviceD3D(hwnd))

src/work-calendar.cpp

@@ -22,6 +22,10 @@ static int current_day = 1;
 static ImFont *inter_regular;
 static ImFont *inter_bold;
 
+char *open_file_dialog();
+char *save_file_dialog();
+void set_window_title(const char *title);
+
 int get_current_year(){
     time_t t = time(NULL);           
     struct tm tm = *localtime(&t);   
@@ -69,7 +73,7 @@ void init(){
     year = get_current_year();
 }
 
-static const char *savefile_path = "./calendar";
+static char *save_file_path = NULL;
 static const char *wiki_url = "https://gitea.ammerhai.com/Ammerhai/work-calendar/wiki";
 
 static const char *month_names[] = {"Januar", "Februar", "März", "April", "Mai", "Juni", "Juli", "August", "September", "Oktober", "November", "Dezember"};
@@ -106,8 +110,10 @@ ImVec4 table_sunday_bg = ImVec4(0.0f, 0.0f, 0.0f, 0.2f);
 ImVec4 table_hover_color = ImVec4(0.0f, 0.3f, 0.6f, 0.2f);
 
 void save(){
+    if(!save_file_path) return;
+
     uint32_t version = 1;
-    FILE *save_file = fopen(savefile_path, "wb");
+    FILE *save_file = fopen(save_file_path, "wb");
     fwrite(&version,              sizeof(version),              1, save_file);
     fwrite(&num_categories,       sizeof(num_categories),       1, save_file);
     fwrite(&num_categorized_days, sizeof(num_categorized_days), 1, save_file);
@@ -128,7 +134,7 @@ void save(){
 }
 
 void load(){
-    FILE *save_file = fopen(savefile_path, "rb");
+    FILE *save_file = fopen(save_file_path, "rb");
     uint32_t version = 0;
     fread(&version, sizeof(version), 1, save_file);
     if(version != 1) {
@@ -184,16 +190,37 @@ void per_frame(){
 
     if (ImGui::BeginMainMenuBar()) {
         if (ImGui::BeginMenu("Datei")) {
-            if (ImGui::MenuItem("Kalender öffnen", NULL)) {
+            if (ImGui::MenuItem("Öffnen", "Ctrl + O")) {
-                //TODO popup + filepicker
+                char *new_save_file_path = open_file_dialog();
-                load();
+                if(new_save_file_path) {
+                    if(save_file_path) free(save_file_path);
+                    save_file_path = new_save_file_path;
+                    load();
+
+                    char *title = (char *)calloc(1, strlen("Work Calendar - ") + strlen(save_file_path) + 1);
+                    memcpy(title, "Work Calendar - ", strlen("Work Calendar - "));
+                    memcpy(title + strlen("Work Calendar - "), save_file_path, strlen(save_file_path));
+
+                    set_window_title(title);
+                    free(title);
+                }
             }
-            if (ImGui::MenuItem("Kalender speichern", NULL)) {
+            if (ImGui::MenuItem("Speichern", "Ctrl + S", false, !!save_file_path)) {
                 save();
             }
 
+            if (ImGui::MenuItem("Speichern unter", "Ctrl + Shift + S")) {
+                char *new_save_file_path = save_file_dialog();
+                if(new_save_file_path) {
+                    if(save_file_path) free(save_file_path);
+                    save_file_path = new_save_file_path;
+                    save();
+                }
+            }
+
+            //TODO
             ImGui::Separator();
-            ImGui::MenuItem("Abmelden", NULL);
+            ImGui::MenuItem("Kalender Schließen", "Ctrl + X");
 
             ImGui::Separator();
             if (ImGui::MenuItem("Beenden", NULL)) {
@@ -213,7 +240,7 @@ void per_frame(){
                 ImGui::GetPlatformIO().Platform_OpenInShellFn(ImGui::GetCurrentContext(), wiki_url);
             }
             ImGui::Separator();
-            ImGui::MenuItem("Über", NULL);
+            ImGui::MenuItem("Über", NULL); //TODO
             ImGui::EndMenu();
         }