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KeyboardSettings: Add checkbox to enable Caps Lock mapping to Ctrl
This patch adds an additional control to KeyboardSettings allowing the user to map Caps Lock to Ctrl. Previously, this was only possible by writing to /sys/kernel/variables/caps_lock_to_ctrl. Writing to /sys/kernel/variables/caps_lock_to_ctrl requires root privileges, but KeyboardSettings will not attempt to elevate the privilege of the user if they are not root. Instead, the checkbox is rendered as un-editable.
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4 changed files with 53 additions and 0 deletions
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@ -1,6 +1,7 @@
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/*
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* Copyright (c) 2020, Hüseyin Aslıtürk <asliturk@hotmail.com>
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* Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
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* Copyright (c) 2022, Sam Cohen <sbcohen2000@gmail.com>
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* Copyright (c) 2022, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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@ -255,6 +256,19 @@ KeyboardSettingsWidget::KeyboardSettingsWidget()
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m_num_lock_checkbox->on_checked = [&](auto) {
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set_modified(true);
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};
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m_caps_lock_checkbox = find_descendant_of_type_named<GUI::CheckBox>("caps_lock_remapped_to_ctrl_checkbox");
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auto caps_lock_is_remapped = read_caps_lock_to_ctrl_sys_variable();
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if (caps_lock_is_remapped.is_error()) {
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auto error_message = DeprecatedString::formatted("Could not determine if Caps Lock is remapped to Ctrl: {}", caps_lock_is_remapped.error());
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GUI::MessageBox::show_error(window(), error_message);
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} else {
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m_caps_lock_checkbox->set_checked(caps_lock_is_remapped.value());
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}
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m_caps_lock_checkbox->set_enabled(getuid() == 0);
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m_caps_lock_checkbox->on_checked = [&](auto) {
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set_modified(true);
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};
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}
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KeyboardSettingsWidget::~KeyboardSettingsWidget()
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@ -282,6 +296,7 @@ void KeyboardSettingsWidget::apply_settings()
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}
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m_initial_active_keymap = m_keymaps_list_model.active_keymap();
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Config::write_bool("KeyboardSettings"sv, "StartupEnable"sv, "NumLock"sv, m_num_lock_checkbox->is_checked());
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write_caps_lock_to_ctrl_sys_variable(m_caps_lock_checkbox->is_checked());
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}
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void KeyboardSettingsWidget::set_keymaps(Vector<DeprecatedString> const& keymaps, DeprecatedString const& active_keymap)
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@ -289,3 +304,20 @@ void KeyboardSettingsWidget::set_keymaps(Vector<DeprecatedString> const& keymaps
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auto keymaps_string = DeprecatedString::join(',', keymaps);
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GUI::Process::spawn_or_show_error(window(), "/bin/keymap"sv, Array { "-s", keymaps_string.characters(), "-m", active_keymap.characters() });
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}
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void KeyboardSettingsWidget::write_caps_lock_to_ctrl_sys_variable(bool caps_lock_to_ctrl)
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{
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if (getuid() != 0)
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return;
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auto write_command = DeprecatedString::formatted("caps_lock_to_ctrl={}", caps_lock_to_ctrl ? "1" : "0");
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GUI::Process::spawn_or_show_error(window(), "/bin/sysctl"sv, Array { "-w", write_command.characters() });
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}
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ErrorOr<bool> KeyboardSettingsWidget::read_caps_lock_to_ctrl_sys_variable()
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{
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auto file = TRY(Core::File::open("/sys/kernel/variables/caps_lock_to_ctrl"sv, Core::File::OpenMode::Read));
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auto buffer = TRY(file->read_until_eof());
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StringView contents_string((char const*)buffer.data(), min(1, buffer.size()));
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return contents_string == "1";
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}
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