Spreadsheet: Start making a spreadsheet application

Applications/Spreadsheet/SpreadsheetModel.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 "SpreadsheetModel.h"
+
+namespace Spreadsheet {
+
+SheetModel::~SheetModel()
+{
+}
+
+GUI::Variant SheetModel::data(const GUI::ModelIndex& index, GUI::ModelRole role) const
+{
+    if (!index.is_valid())
+        return {};
+
+    if (role == GUI::ModelRole::Display) {
+        if (index.column() == 0)
+            return String::number(index.row());
+
+        const auto* value = m_sheet->at({ m_sheet->column(index.column() - 1), (size_t)index.row() });
+        if (!value)
+            return String::empty();
+
+        if (value->kind == Spreadsheet::Cell::Formula)
+            return value->evaluated_data.is_empty() ? "" : value->evaluated_data.to_string_without_side_effects();
+
+        return value->data;
+    }
+
+    if (role == GUI::ModelRole::TextAlignment) {
+        if (index.column() == 0)
+            return {};
+
+        return {};
+    }
+
+    return {};
+}
+
+String SheetModel::column_name(int index) const
+{
+    if (index < 0)
+        return {};
+
+    if (index == 0)
+        return "";
+
+    return m_sheet->column(index - 1);
+}
+
+bool SheetModel::is_editable(const GUI::ModelIndex& index) const
+{
+    if (!index.is_valid())
+        return false;
+
+    if (index.column() == 0)
+        return false;
+
+    return true;
+}
+
+void SheetModel::set_data(const GUI::ModelIndex& index, const GUI::Variant& value)
+{
+    if (!index.is_valid())
+        return;
+
+    if (index.column() == 0)
+        return;
+
+    auto& cell = m_sheet->ensure({ m_sheet->column(index.column() - 1), (size_t)index.row() });
+    cell.set_data(value.to_string());
+    update();
+}
+
+void SheetModel::update()
+{
+    m_sheet->update();
+}
+
+}