WindowServer+Keymap+LibGUI: Add widget to display current keymap

Userland/Applets/CMakeLists.txt

@@ -3,3 +3,4 @@ add_subdirectory(ClipboardHistory)
 add_subdirectory(Network)
 add_subdirectory(ResourceGraph)
 add_subdirectory(WorkspacePicker)
+add_subdirectory(Keymap)

Userland/Applets/Keymap/CMakeLists.txt

@@ -0,0 +1,13 @@
+serenity_component(
+    Keymap.Applet
+    REQUIRED
+    TARGETS Keymap.Applet
+)
+
+set(SOURCES
+    KeymapStatusWindow.cpp
+    main.cpp
+)
+
+serenity_bin(Keymap.Applet)
+target_link_libraries(Keymap.Applet LibGUI LibCore LibGfx LibMain LibKeyboard)

Userland/Applets/Keymap/KeymapStatusWindow.cpp

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2021, Timur Sultanov <SultanovTS@yandex.ru>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "KeymapStatusWindow.h"
+#include <LibGUI/Painter.h>
+#include <LibGUI/WindowManagerServerConnection.h>
+#include <LibKeyboard/CharacterMap.h>
+
+KeymapStatusWindow::KeymapStatusWindow()
+{
+    set_window_type(GUI::WindowType::Applet);
+    set_has_alpha_channel(true);
+    m_label = &set_main_widget<GUI::Label>();
+
+    auto current_keymap = MUST(Keyboard::CharacterMap::fetch_system_map());
+    auto current_keymap_name = current_keymap.character_map_name();
+    m_label->set_tooltip(current_keymap_name);
+    m_label->set_text(current_keymap_name.substring(0, 2));
+}
+
+KeymapStatusWindow::~KeymapStatusWindow()
+{
+}
+
+void KeymapStatusWindow::wm_event(GUI::WMEvent& event)
+{
+    if (event.type() == GUI::WMEvent::WM_KeymapChanged) {
+        auto& keymap_event = static_cast<GUI::WMKeymapChangedEvent&>(event);
+        auto keymap = keymap_event.keymap();
+        set_keymap_text(keymap);
+    }
+}
+
+void KeymapStatusWindow::set_keymap_text(const String& keymap)
+{
+    GUI::Painter painter(*m_label);
+    painter.clear_rect(m_label->rect(), Color::from_rgba(0));
+
+    m_label->set_tooltip(keymap);
+    m_label->set_text(keymap.substring(0, 2));
+}

Userland/Applets/Keymap/KeymapStatusWindow.h

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2021, Timur Sultanov <SultanovTS@yandex.ru>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibGUI/Label.h>
+#include <LibGUI/Window.h>
+
+class KeymapStatusWidget;
+
+class KeymapStatusWindow final : public GUI::Window {
+    C_OBJECT(KeymapStatusWindow)
+public:
+    virtual ~KeymapStatusWindow() override;
+
+private:
+    void wm_event(GUI::WMEvent&) override;
+
+    KeymapStatusWindow();
+
+    RefPtr<GUI::Label> m_label;
+
+    void set_keymap_text(String const& keymap);
+};

Userland/Applets/Keymap/main.cpp

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2021, Timur Sultanov <SultanovTS@yandex.ru>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "KeymapStatusWindow.h"
+#include <LibCore/System.h>
+#include <LibGUI/Application.h>
+#include <LibGUI/WindowManagerServerConnection.h>
+#include <LibMain/Main.h>
+#include <WindowServer/Window.h>
+
+ErrorOr<int> serenity_main(Main::Arguments arguments)
+{
+    TRY(Core::System::pledge("stdio recvfd sendfd rpath unix getkeymap"));
+
+    auto app = TRY(GUI::Application::try_create(arguments));
+
+    auto window = TRY(KeymapStatusWindow::try_create());
+    window->set_has_alpha_channel(true);
+    window->set_title("Keymap");
+    window->resize(16, 16);
+    window->show();
+    window->make_window_manager(WindowServer::WMEventMask::KeymapChanged);
+
+    TRY(Core::System::pledge("stdio recvfd sendfd rpath getkeymap"));
+
+    return app->exec();
+}