add basic save and load

add menu
- save
- load
- demo on/off
- close + popup

#9 #10

src/work-calendar.cpp

@@ -1,9 +1,14 @@
 #include <imgui.h>
 #include <imgui_internal.h>
 #include <time.h>
+#include <stdio.h>
+#include <stdint.h>
 
 #include "inter.h"
 
+extern bool should_exit;
+extern bool show_demo_window;
+
 //standard year
 int year = 2025;
 
@@ -49,6 +54,8 @@ void init(){
     year = get_current_year();
 }
 
+static char* savefile_path = "./calendar";
+
 static const char* month_names[] = {"Januar", "Februar", "März", "April", "Mai", "Juni", "Juli", "August", "September", "Oktober", "November", "Dezember"};
 
 typedef struct Category {
@@ -57,7 +64,7 @@ typedef struct Category {
     char name[64] = "New Category";
 } Category;
 
-static size_t num_categories = 0;
+static uint32_t num_categories = 0;
 static Category categories[128];
 
 static bool legend_visible = true;
@@ -72,7 +79,7 @@ typedef struct Categorized_Day {
 } Categorized_Day;
 
 static int year_min_size = 1;
-static size_t num_categorized_days = 0;
+static uint32_t num_categorized_days = 0;
 static Categorized_Day categorized_days[365*50];
 
 //Colors
@@ -82,6 +89,58 @@ 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(){
+    uint32_t version = 1;
+    FILE *save_file = fopen(savefile_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);
+
+    for (int i = 0; i < num_categories; i++) {
+        fwrite(&categories[i].color, sizeof(categories[i].color), 1, save_file);
+        fwrite(&categories[i].name,  sizeof(categories[i].name),  1, save_file);
+    }
+
+    for (int i = 0; i < num_categorized_days; i++) { 
+        fwrite(&categorized_days[i].year,     sizeof(categorized_days[i].year),     1, save_file);
+        fwrite(&categorized_days[i].month,    sizeof(categorized_days[i].month),    1, save_file);
+        fwrite(&categorized_days[i].day,      sizeof(categorized_days[i].day),      1, save_file);
+        fwrite(&categorized_days[i].category, sizeof(categorized_days[i].category), 1, save_file);
+    }
+
+    fclose (save_file);
+}
+
+void load(){
+    FILE *save_file = fopen(savefile_path, "rb");
+    uint32_t version = 0;
+    fread(&version, sizeof(version), 1, save_file);
+    if(version != 1) {
+        return; //TODO Popup warning
+    }
+
+    fread(&num_categories,       sizeof(num_categories),       1, save_file);
+    fread(&num_categorized_days, sizeof(num_categorized_days), 1, save_file);
+
+    if(num_categories > IM_ARRAYSIZE(categories) || num_categorized_days > IM_ARRAYSIZE(categorized_days)){
+        return; //TODO Popup warning
+    }
+
+    for (int i = 0; i < num_categories; i++) {
+        fread(&categories[i].color, sizeof(categories[i].color), 1, save_file);
+        fread(&categories[i].name,  sizeof(categories[i].name),  1, save_file);
+    }
+
+    for (int i = 0; i < num_categorized_days; i++) { 
+        fread(&categorized_days[i].year,     sizeof(categorized_days[i].year),     1, save_file);
+        fread(&categorized_days[i].month,    sizeof(categorized_days[i].month),    1, save_file);
+        fread(&categorized_days[i].day,      sizeof(categorized_days[i].day),      1, save_file);
+        fread(&categorized_days[i].category, sizeof(categorized_days[i].category), 1, save_file);
+    }
+
+    fclose (save_file);
+}
+
 void per_frame(){
     ImGuiStyle &style = ImGui::GetStyle();
 
@@ -101,8 +160,29 @@ void per_frame(){
     }
     ImGui::DockSpaceOverViewport(main_viewport_dock, ImGui::GetMainViewport(), ImGuiDockNodeFlags_NoTabBar);
 
+    ImGuiID close_popup  = ImGui::GetID("Close");
+    ImGuiID open_popup   = ImGui::GetID("Open");
+    ImGuiID save_popup   = ImGui::GetID("Save");
+    ImGuiID logout_popup = ImGui::GetID("Logout"); //TODO
+    ImGuiID about_popup  = ImGui::GetID("About");
+
     if (ImGui::BeginMainMenuBar()) {
         if (ImGui::BeginMenu("Datei")) {
+            if (ImGui::MenuItem("Kalender öffnen", NULL)) {
+                //TODO popup + filepicker
+                load();
+            }
+            if (ImGui::MenuItem("Kalender speichern", NULL)) {
+                save();
+            }
+
+            ImGui::Separator();
+            ImGui::MenuItem("Abmelden", NULL);
+
+            ImGui::Separator();
+            if (ImGui::MenuItem("Beenden", NULL)) {
+                ImGui::OpenPopup(close_popup);
+            }
             ImGui::EndMenu();
         }
 
@@ -111,9 +191,36 @@ void per_frame(){
             ImGui::EndMenu();
         }
 
+        if (ImGui::BeginMenu("Hilfe")) {
+            ImGui::MenuItem("Demo", NULL, &show_demo_window);
+            ImGui::MenuItem("Wiki", NULL);
+            ImGui::Separator();
+            ImGui::MenuItem("Über", NULL);
+            ImGui::EndMenu();
+        }
+
         ImGui::EndMainMenuBar();
     }
 
+    ImVec2 center = ImGui::GetMainViewport()->GetCenter();
+    ImGui::SetNextWindowPos(center, ImGuiCond_Appearing, ImVec2(0.5f, 0.5f));
+    if (ImGui::BeginPopupModal("Close", NULL, ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_AlwaysAutoResize)) {
+        ImGui::Text("Möchten Sie wirklich beenden?");
+
+        ImGui::SetItemDefaultFocus();
+        if (ImGui::Button("Ja", ImVec2(120, 0))) { 
+            should_exit = true;
+            ImGui::CloseCurrentPopup(); 
+        }
+
+        ImGui::SameLine();
+        if (ImGui::Button("Nein", ImVec2(120, 0))) { 
+            ImGui::CloseCurrentPopup(); 
+        }
+        
+        ImGui::EndPopup();
+    }
+
     if (ImGui::Begin("Work Calendar", 0)) {
         ImGui::PushStyleColor(ImGuiCol_TableHeaderBg, {0,0,0,0});
         ImGui::PushStyleColor(ImGuiCol_HeaderHovered, {0,0,0,0});
@@ -133,6 +240,7 @@ void per_frame(){
             ImGui::TableSetColumnIndex(1);
             if (ImGui::ArrowButton("##left", ImGuiDir_Left)) 
                 year--;
+
             ImGui::TableSetColumnIndex(2);
             ImGui::TextAligned(0.5, -FLT_MIN, "%d", year);