LibGUI: Make it easier to create checkable GUI::Actions

This patch adds GUI::Action::create_checkable() helpers that work just
like the existing create() helpers, but the actions become checkable(!)

Clients are no longer required to manage the checked state of their
actions manually, but instead they will be checked/unchecked as needed
by GUI::Action itself before the activation hook is fired.

1 files changed, 1 insertions, 3 deletions

diff --git a/Applications/SystemMonitor/main.cpp b/Applications/SystemMonitor/main.cpp
index eefd7a4980..ca2a27afce 100644
--- a/Applications/SystemMonitor/main.cpp
+++ b/Applications/SystemMonitor/main.cpp
@@ -200,11 +200,9 @@ int main(int argc, char** argv)
     frequency_action_group.set_exclusive(true);
 
     auto make_frequency_action = [&](auto& title, int interval, bool checked = false) {
-        auto action = GUI::Action::create(title, [&refresh_timer, interval](auto& action) {
+        auto action = GUI::Action::create_checkable(title, [&refresh_timer, interval](auto&) {
             refresh_timer.restart(interval);
-            action.set_checked(true);
         });
-        action->set_checkable(true);
         action->set_checked(checked);
         frequency_action_group.add_action(*action);
         frequency_menu.add_action(*action);