Minesweeper: Add "Custom game..." difficulty

This adds a dialog window which allows us to customize the size of the
board and the amount of mines that will be placed.
The current max amount of mines is 50% of the total number of cells
due to the fact that the generator algorithm takes too long to create a
board for higher percentages of mines.

Userland/Games/Minesweeper/CMakeLists.txt

@@ -4,7 +4,11 @@ serenity_component(
     TARGETS Minesweeper
 )
 
+compile_gml(MinesweeperCustomGameWindow.gml MinesweeperCustomGameWindowGML.h minesweeper_custom_game_window_gml)
+
 set(SOURCES
+    MinesweeperCustomGameWindowGML.h
+    CustomGameDialog.cpp
     Field.cpp
     main.cpp
 )

Userland/Games/Minesweeper/CustomGameDialog.cpp

@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2021, Pedro Pereira <pmh.pereira@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "CustomGameDialog.h"
+#include "Field.h"
+#include <Games/Minesweeper/MinesweeperCustomGameWindowGML.h>
+
+int CustomGameDialog::show(GUI::Window* parent_window, Field& field)
+{
+    auto dialog = CustomGameDialog::construct(parent_window);
+
+    if (parent_window) {
+        dialog->set_icon(parent_window->icon());
+        dialog->center_within(*parent_window);
+    }
+
+    dialog->m_columns_spinbox->set_value(field.columns());
+    dialog->m_rows_spinbox->set_value(field.rows());
+    dialog->m_mines_spinbox->set_value(field.mine_count());
+
+    auto result = dialog->exec();
+
+    if (result != GUI::Dialog::ExecOK)
+        return result;
+
+    field.set_field_size(dialog->m_rows_spinbox->value(), dialog->m_columns_spinbox->value(), dialog->m_mines_spinbox->value());
+
+    return GUI::Dialog::ExecOK;
+}
+
+void CustomGameDialog::set_max_mines()
+{
+    // Generating a field with > 50% mines takes too long.
+    // FIXME: Allow higher amount of mines to be placed.
+    m_mines_spinbox->set_max((m_rows_spinbox->value() * m_columns_spinbox->value()) / 2);
+}
+
+CustomGameDialog::CustomGameDialog(Window* parent_window)
+    : Dialog(parent_window)
+{
+    resize(305, 90);
+    center_on_screen();
+    set_resizable(false);
+    set_title("Custom game");
+
+    auto& main_widget = set_main_widget<GUI::Widget>();
+    if (!main_widget.load_from_gml(minesweeper_custom_game_window_gml))
+        VERIFY_NOT_REACHED();
+
+    m_columns_spinbox = *main_widget.find_descendant_of_type_named<GUI::SpinBox>("columns_spinbox");
+    m_rows_spinbox = *main_widget.find_descendant_of_type_named<GUI::SpinBox>("rows_spinbox");
+    m_mines_spinbox = *main_widget.find_descendant_of_type_named<GUI::SpinBox>("mines_spinbox");
+    m_ok_button = *main_widget.find_descendant_of_type_named<GUI::Button>("ok_button");
+    m_cancel_button = *main_widget.find_descendant_of_type_named<GUI::Button>("cancel_button");
+
+    m_columns_spinbox->on_change = [this](auto) {
+        set_max_mines();
+    };
+
+    m_rows_spinbox->on_change = [this](auto) {
+        set_max_mines();
+    };
+
+    m_ok_button->on_click = [this](auto) {
+        done(ExecResult::ExecOK);
+    };
+
+    m_cancel_button->on_click = [this](auto) {
+        done(ExecResult::ExecCancel);
+    };
+
+    set_max_mines();
+}
+
+CustomGameDialog::~CustomGameDialog()
+{
+}

Userland/Games/Minesweeper/CustomGameDialog.h

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2021, Pedro Pereira <pmh.pereira@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibGUI/Button.h>
+#include <LibGUI/Dialog.h>
+#include <LibGUI/SpinBox.h>
+
+class Field;
+
+class CustomGameDialog : public GUI::Dialog {
+    C_OBJECT(CustomGameDialog);
+
+public:
+    static int show(GUI::Window* parent_window, Field& field);
+
+private:
+    CustomGameDialog(GUI::Window* parent_window);
+    virtual ~CustomGameDialog() override;
+
+    void set_max_mines();
+
+    RefPtr<GUI::Button> m_ok_button;
+    RefPtr<GUI::Button> m_cancel_button;
+    RefPtr<GUI::SpinBox> m_columns_spinbox;
+    RefPtr<GUI::SpinBox> m_rows_spinbox;
+    RefPtr<GUI::SpinBox> m_mines_spinbox;
+};

Userland/Games/Minesweeper/MinesweeperCustomGameWindow.gml

@@ -0,0 +1,80 @@
+@GUI::Widget {
+    fill_with_background_color: true
+
+    layout: @GUI::VerticalBoxLayout {
+        margins: [4]
+    }
+
+    @GUI::GroupBox {
+        title: "Field"
+        autosize: true
+
+        layout: @GUI::HorizontalBoxLayout {
+            margins: [16, 6, 6]
+        }
+
+        @GUI::Label {
+            text: "Columns: "
+            autosize: true
+        }
+
+        @GUI::SpinBox {
+            name: "columns_spinbox"
+            min: 10
+            max: 50
+            fixed_width: 40
+        }
+
+        @GUI::VerticalSeparator {
+        }
+        
+        @GUI::Label {
+            text: "Rows: "
+            autosize: true
+        }
+
+        @GUI::SpinBox {
+            name: "rows_spinbox"
+            min: 10
+            max: 50
+            fixed_width: 40
+        }
+
+        @GUI::VerticalSeparator {
+        }
+
+        @GUI::Label {
+            text: "Mines: "
+            autosize: true
+        }
+
+        @GUI::SpinBox {
+            name: "mines_spinbox"
+            min: 1
+            max: 2500
+            fixed_width: 50
+        }
+    }
+
+    @GUI::Widget {
+        max_height: 24
+
+        layout: @GUI::HorizontalBoxLayout {
+        }
+
+        @GUI::Widget {
+        }
+
+        @GUI::Button {
+            name: "ok_button"
+            text: "OK"
+            max_width: 75
+        }
+
+        @GUI::Button {
+            name: "cancel_button"
+            text: "Cancel"
+            max_width: 75
+        }
+    }
+}

Userland/Games/Minesweeper/main.cpp

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include "CustomGameDialog.h"
 #include "Field.h"
 #include <LibConfig/Client.h>
 #include <LibGUI/Action.h>
@@ -131,6 +132,10 @@ int main(int argc, char** argv)
     difficulty_menu.add_action(GUI::Action::create("&Madwoman", { Mod_Ctrl, Key_M }, [&](auto&) {
         field.set_field_size(32, 60, 350);
     }));
+    difficulty_menu.add_separator();
+    difficulty_menu.add_action(GUI::Action::create("&Custom game...", { Mod_Ctrl, Key_C }, [&](auto&) {
+        CustomGameDialog::show(window, field);
+    }));
 
     auto& help_menu = window->add_menu("&Help");
     help_menu.add_action(GUI::CommonActions::make_about_action("Minesweeper", app_icon, window));