Services: Move Taskbar and SystemMenu from Applications to Services

Services/SystemMenu/Makefile

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+OBJS = \
+    main.o \
+	PowerDialog.o
+
+PROGRAM = SystemMenu
+
+LIB_DEPS = GUI Gfx IPC Core
+
+include ../../Makefile.common

Services/SystemMenu/PowerDialog.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 <AK/String.h>
+#include <AK/Vector.h>
+#include <LibGUI/BoxLayout.h>
+#include <LibGUI/Button.h>
+#include <LibGUI/Desktop.h>
+#include <LibGUI/Label.h>
+#include <LibGUI/RadioButton.h>
+#include <LibGUI/Widget.h>
+#include <LibGfx/Font.h>
+
+#include "PowerDialog.h"
+
+struct PowerOption {
+    String title;
+    Vector<char const*> cmd;
+    bool enabled;
+    bool default_action;
+};
+
+static const Vector<PowerOption> options = {
+    { "Shut down", { "/bin/shutdown", "--now", nullptr }, true, true },
+    { "Restart", { "/bin/reboot", nullptr }, true, false },
+    { "Log out", {}, false, false },
+    { "Sleep", {}, false, false },
+};
+
+Vector<char const*> PowerDialog::show()
+{
+    auto rc = PowerDialog::construct()->exec();
+    if(rc == ExecResult::ExecOK)
+        return options[rc].cmd;
+
+    return {};
+}
+
+PowerDialog::PowerDialog()
+	: GUI::Dialog(nullptr)
+{
+    Gfx::Rect rect({ 0, 0, 180, 180 + ((static_cast<int>(options.size()) - 3) * 16) });
+    rect.center_within(GUI::Desktop::the().rect());
+    set_rect(rect);
+    set_resizable(false);
+    set_title("SerenityOS");
+    set_icon(Gfx::Bitmap::load_from_file("/res/icons/16x16/power.png"));
+
+    auto& main = set_main_widget<GUI::Widget>();
+    main.set_layout<GUI::VerticalBoxLayout>();
+    main.layout()->set_margins({ 8, 8, 8, 8 });
+    main.layout()->set_spacing(8);
+    main.set_fill_with_background_color(true);
+
+    auto& header = main.add<GUI::Label>();
+    header.set_text("What would you like to do?");
+    header.set_preferred_size(0, 16);
+    header.set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fixed);
+    header.set_font(Gfx::Font::default_bold_font());
+
+    for (size_t i = 0; i < options.size(); i++) {
+        auto action = options[i];
+        auto& radio = main.add<GUI::RadioButton>();
+        radio.set_enabled(action.enabled);
+        radio.set_text(action.title);
+
+        radio.on_checked = [this, i](auto) {
+            m_selected_option = i;
+        };
+
+        if (action.default_action) {
+            radio.set_checked(true);
+            m_selected_option = i;
+        }
+    }
+
+    auto& button_box = main.add<GUI::Widget>();
+    button_box.set_layout<GUI::HorizontalBoxLayout>();
+    button_box.layout()->set_spacing(8);
+
+    auto& ok_button = button_box.add<GUI::Button>();
+    ok_button.on_click = [this] {
+        done(ExecResult::ExecOK);
+    };
+    ok_button.set_text("OK");
+
+    auto& cancel_button = button_box.add<GUI::Button>();
+    cancel_button.on_click = [this] {
+        done(ExecResult::ExecCancel);
+    };
+    cancel_button.set_text("Cancel");
+}
+
+PowerDialog::~PowerDialog()
+{
+}

Services/SystemMenu/PowerDialog.h

@@ -0,0 +1,41 @@
+/*
+ * 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 <AK/Vector.h>
+#include <LibCore/Object.h>
+#include <LibGUI/Dialog.h>
+
+class PowerDialog : public GUI::Dialog {
+    C_OBJECT(PowerDialog)
+public:
+    static Vector<char const*> show();
+
+private:
+    PowerDialog();
+    ~PowerDialog();
+
+    int m_selected_option { -1 };
+};

Services/SystemMenu/main.cpp

@@ -0,0 +1,218 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * 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 "PowerDialog.h"
+#include <AK/FileSystemPath.h>
+#include <AK/QuickSort.h>
+#include <LibCore/ConfigFile.h>
+#include <LibCore/DirIterator.h>
+#include <LibCore/StandardPaths.h>
+#include <LibGUI/Action.h>
+#include <LibGUI/ActionGroup.h>
+#include <LibGUI/Application.h>
+#include <LibGUI/Menu.h>
+#include <LibGUI/WindowServerConnection.h>
+#include <LibGfx/Bitmap.h>
+
+//#define SYSTEM_MENU_DEBUG
+
+struct AppMetadata {
+    String executable;
+    String name;
+    String icon_path;
+    String category;
+};
+Vector<AppMetadata> g_apps;
+
+HashMap<String, NonnullRefPtr<GUI::Menu>> g_app_category_menus;
+
+struct ThemeMetadata {
+    String name;
+    String path;
+};
+
+Color g_menu_selection_color;
+
+Vector<ThemeMetadata> g_themes;
+RefPtr<GUI::Menu> g_themes_menu;
+GUI::ActionGroup g_themes_group;
+
+static NonnullRefPtr<GUI::Menu> build_system_menu();
+
+int main(int argc, char** argv)
+{
+    GUI::Application app(argc, argv);
+
+    auto menu = build_system_menu();
+    menu->realize_menu_if_needed();
+
+    GUI::WindowServerConnection::the().send_sync<Messages::WindowServer::SetSystemMenu>(menu->menu_id());
+
+    if (pledge("stdio shared_buffer accept rpath proc exec", nullptr) < 0) {
+        perror("pledge");
+        return 1;
+    }
+
+    if (chdir(Core::StandardPaths::home_directory().characters()) < 0) {
+        perror("chdir");
+        return 1;
+    }
+
+    if (unveil("/bin", "x")) {
+        perror("unveil");
+        return 1;
+    }
+
+    if (unveil("/res", "r")) {
+        perror("unveil");
+        return 1;
+    }
+
+    unveil(nullptr, nullptr);
+
+    return app.exec();
+}
+
+NonnullRefPtr<GUI::Menu> build_system_menu()
+{
+    HashTable<String> seen_app_categories;
+    {
+        Core::DirIterator dt("/res/apps", Core::DirIterator::SkipDots);
+        while (dt.has_next()) {
+            auto af_name = dt.next_path();
+            auto af_path = String::format("/res/apps/%s", af_name.characters());
+            auto af = Core::ConfigFile::open(af_path);
+            if (!af->has_key("App", "Name") || !af->has_key("App", "Executable"))
+                continue;
+            auto app_name = af->read_entry("App", "Name");
+            auto app_executable = af->read_entry("App", "Executable");
+            auto app_category = af->read_entry("App", "Category");
+            auto app_icon_path = af->read_entry("Icons", "16x16");
+            g_apps.append({ app_executable, app_name, app_icon_path, app_category });
+            seen_app_categories.set(app_category);
+        }
+        quick_sort(g_apps, [](auto& a, auto& b) { return a.name < b.name; });
+    }
+
+    Vector<String> sorted_app_categories;
+    for (auto& category : seen_app_categories)
+        sorted_app_categories.append(category);
+    quick_sort(sorted_app_categories);
+
+    auto system_menu = GUI::Menu::construct("\xE2\x9A\xA1"); // HIGH VOLTAGE SIGN
+
+    // First we construct all the necessary app category submenus.
+    for (const auto& category : sorted_app_categories) {
+
+        if (g_app_category_menus.contains(category))
+            continue;
+        auto& category_menu = system_menu->add_submenu(category);
+        g_app_category_menus.set(category, category_menu);
+    }
+
+    // Then we create and insert all the app menu items into the right place.
+    int app_identifier = 0;
+    for (const auto& app : g_apps) {
+        RefPtr<Gfx::Bitmap> icon;
+        if (!app.icon_path.is_empty())
+            icon = Gfx::Bitmap::load_from_file(app.icon_path);
+
+#ifdef SYSTEM_MENU_DEBUG
+        if (icon)
+            dbg() << "App " << app.name << " has icon with size " << icon->size();
+#endif
+
+        auto parent_menu = g_app_category_menus.get(app.category).value_or(*system_menu);
+        parent_menu->add_action(GUI::Action::create(app.name, icon.ptr(), [app_identifier](auto&) {
+            dbg() << "Activated app with ID " << app_identifier;
+            if (fork() == 0) {
+                const auto& bin = g_apps[app_identifier].executable;
+                if (execl(bin.characters(), bin.characters(), nullptr) < 0)
+                    perror("execl");
+                ASSERT_NOT_REACHED();
+            }
+        }));
+        ++app_identifier;
+    }
+
+    system_menu->add_separator();
+
+    g_themes_group.set_exclusive(true);
+    g_themes_group.set_unchecking_allowed(false);
+
+    g_themes_menu = &system_menu->add_submenu("Themes");
+
+    {
+        Core::DirIterator dt("/res/themes", Core::DirIterator::SkipDots);
+        while (dt.has_next()) {
+            auto theme_name = dt.next_path();
+            auto theme_path = String::format("/res/themes/%s", theme_name.characters());
+            g_themes.append({ FileSystemPath(theme_name).title(), theme_path });
+        }
+        quick_sort(g_themes, [](auto& a, auto& b) { return a.name < b.name; });
+    }
+
+    auto current_theme_name = GUI::WindowServerConnection::the().send_sync<Messages::WindowServer::GetSystemTheme>()->theme_name();
+
+    {
+        int theme_identifier = 0;
+        for (auto& theme : g_themes) {
+            auto action = GUI::Action::create_checkable(theme.name, [theme_identifier](auto&) {
+                auto& theme = g_themes[theme_identifier];
+                dbg() << "Theme switched to " << theme.name << " at path " << theme.path;
+                auto response = GUI::WindowServerConnection::the().send_sync<Messages::WindowServer::SetSystemTheme>(theme.path, theme.name);
+                ASSERT(response->success());
+            });
+            if (theme.name == current_theme_name)
+                action->set_checked(true);
+            g_themes_group.add_action(action);
+            g_themes_menu->add_action(action);
+            ++theme_identifier;
+        }
+    }
+
+    system_menu->add_separator();
+    system_menu->add_action(GUI::Action::create("About...", Gfx::Bitmap::load_from_file("/res/icons/16x16/ladybug.png"), [](auto&) {
+        if (fork() == 0) {
+            execl("/bin/About", "/bin/About", nullptr);
+            ASSERT_NOT_REACHED();
+        }
+    }));
+    system_menu->add_separator();
+    system_menu->add_action(GUI::Action::create("Exit...", [](auto&) {
+        Vector<char const*> command = PowerDialog::show();
+
+        if (command.size() == 0)
+            return;
+
+        if (fork() == 0) {
+            execv(command[0], const_cast<char* const*>(command.data()));
+            ASSERT_NOT_REACHED();
+        }
+    }));
+
+    return system_menu;
+}