Spreadsheet: Start making a spreadsheet application

Applications/Spreadsheet/SpreadsheetWidget.cpp

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+/*
+ * Copyright (c) 2020, the SerenityOS developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "SpreadsheetWidget.h"
+#include <AK/JsonArray.h>
+#include <AK/JsonObject.h>
+#include <AK/JsonObjectSerializer.h>
+#include <LibCore/File.h>
+#include <LibGUI/BoxLayout.h>
+#include <LibGUI/MessageBox.h>
+#include <LibGUI/TabWidget.h>
+#include <string.h>
+
+namespace Spreadsheet {
+
+SpreadsheetWidget::SpreadsheetWidget()
+{
+    set_fill_with_background_color(true);
+    set_layout<GUI::VerticalBoxLayout>().set_margins({ 2, 2, 2, 2 });
+    m_tab_widget = add<GUI::TabWidget>();
+    m_tab_widget->set_tab_position(GUI::TabWidget::TabPosition::Bottom);
+
+    m_sheets.append(Sheet::construct("Sheet 1"));
+    m_tab_widget->add_tab<SpreadsheetView>(m_sheets.first().name(), m_sheets.first());
+}
+
+SpreadsheetWidget::~SpreadsheetWidget()
+{
+}
+
+void SpreadsheetWidget::save(const StringView& filename)
+{
+    JsonArray array;
+    m_tab_widget->for_each_child_of_type<SpreadsheetView>([&](auto& view) {
+        array.append(view.sheet().to_json());
+        return IterationDecision::Continue;
+    });
+
+    auto file_content = array.to_string();
+
+    auto file = Core::File::construct(filename);
+    file->open(Core::IODevice::WriteOnly);
+    if (!file->is_open()) {
+        StringBuilder sb;
+        sb.append("Failed to open ");
+        sb.append(filename);
+        sb.append(" for write. Error: ");
+        sb.append(file->error_string());
+
+        GUI::MessageBox::show(window(), sb.to_string(), "Error", GUI::MessageBox::Type::Error);
+        return;
+    }
+
+    bool result = file->write(file_content);
+    if (!result) {
+        int error_number = errno;
+        StringBuilder sb;
+        sb.append("Unable to save file. Error: ");
+        sb.append(strerror(error_number));
+
+        GUI::MessageBox::show(window(), sb.to_string(), "Error", GUI::MessageBox::Type::Error);
+        return;
+    }
+}
+
+}