Spreadsheet: Prompt user before closing with unsaved changes

Applications/Spreadsheet/Spreadsheet.cpp

@@ -163,8 +163,10 @@ void Sheet::update()
 
     // Grab a copy as updates might insert cells into the table.
     for (auto& it : m_cells) {
-        if (it.value->dirty())
+        if (it.value->dirty()) {
             cells_copy.append(it.value);
+            m_workbook.set_dirty(true);
+        }
     }
 
     for (auto& cell : cells_copy)

Applications/Spreadsheet/SpreadsheetWidget.cpp

@@ -31,6 +31,7 @@
 #include <LibCore/File.h>
 #include <LibGUI/BoxLayout.h>
 #include <LibGUI/Button.h>
+#include <LibGUI/FilePicker.h>
 #include <LibGUI/Label.h>
 #include <LibGUI/Menu.h>
 #include <LibGUI/MessageBox.h>
@@ -216,6 +217,33 @@ void SpreadsheetWidget::load(const StringView& filename)
     setup_tabs(m_workbook->sheets());
 }
 
+bool SpreadsheetWidget::request_close()
+{
+    if (!m_workbook->dirty())
+        return true;
+
+    auto result = GUI::MessageBox::show(window(), "The spreadsheet has been modified. Would you like to save?", "Unsaved changes", GUI::MessageBox::Type::Warning, GUI::MessageBox::InputType::YesNoCancel);
+
+    if (result == GUI::MessageBox::ExecYes) {
+        if (current_filename().is_empty()) {
+            String name = "workbook";
+            Optional<String> save_path = GUI::FilePicker::get_save_filepath(window(), name, "sheets");
+            if (!save_path.has_value())
+                return false;
+
+            save(save_path.value());
+        } else {
+            save(current_filename());
+        }
+        return true;
+    }
+
+    if (result == GUI::MessageBox::ExecNo)
+        return true;
+
+    return false;
+}
+
 void SpreadsheetWidget::add_sheet()
 {
     StringBuilder name;

Applications/Spreadsheet/SpreadsheetWidget.h

@@ -41,6 +41,7 @@ public:
 
     void save(const StringView& filename);
     void load(const StringView& filename);
+    bool request_close();
     void add_sheet();
     void add_sheet(NonnullRefPtr<Sheet>&&);
 

Applications/Spreadsheet/Workbook.cpp

@@ -183,6 +183,7 @@ Result<bool, String> Workbook::save(const StringView& filename)
     }
 
     set_filename(filename);
+    set_dirty(false);
     return true;
 }
 

Applications/Spreadsheet/Workbook.h

@@ -42,6 +42,8 @@ public:
 
     const String& current_filename() const { return m_current_filename; }
     bool set_filename(const String& filename);
+    bool dirty() { return m_dirty; }
+    void set_dirty(bool dirty) { m_dirty = dirty; }
 
     bool has_sheets() const { return !m_sheets.is_empty(); }
 
@@ -70,6 +72,7 @@ private:
     WorkbookObject* m_workbook_object { nullptr };
 
     String m_current_filename;
+    bool m_dirty { false };
 };
 
 }

Applications/Spreadsheet/main.cpp

@@ -114,9 +114,17 @@ int main(int argc, char* argv[])
     app_menu.add_separator();
 
     app_menu.add_action(GUI::CommonActions::make_quit_action([&](auto&) {
+        if (!spreadsheet_widget.request_close())
+            return;
         app->quit(0);
     }));
 
+    window->on_close_request = [&]() -> GUI::Window::CloseRequestDecision {
+        if (spreadsheet_widget.request_close())
+            return GUI::Window::CloseRequestDecision::Close;
+        return GUI::Window::CloseRequestDecision::StayOpen;
+    };
+
     auto& file_menu = menubar->add_menu("File");
     file_menu.add_action(GUI::CommonActions::make_open_action([&](auto&) {
         Optional<String> load_path = GUI::FilePicker::get_open_filepath(window);