Calculator: Add a Rounding menu

This menu has three actions. Each one of them enable a different level
of rounding: to 0, 2 or 4 digits.

1 files changed, 6 insertions, 3 deletions

diff --git a/Userland/Applications/Calculator/Keypad.cpp b/Userland/Applications/Calculator/Keypad.cpp
index b94fd79e2d..e1624d7a0d 100644
--- a/Userland/Applications/Calculator/Keypad.cpp
+++ b/Userland/Applications/Calculator/Keypad.cpp
@@ -113,10 +113,8 @@ void Keypad::set_to_0()
 
 String Keypad::to_string() const
 {
-    // TODO: Implement custom rounding length in the calculator.
-    constexpr auto maximum_precision = 6;
     if (m_state == State::External)
-        return m_internal_value.to_string(maximum_precision);
+        return m_internal_value.to_string(m_displayed_fraction_length);
 
     StringBuilder builder;
 
@@ -136,3 +134,8 @@ String Keypad::to_string() const
 
     return builder.to_string();
 }
+
+void Keypad::set_rounding_length(unsigned rounding_threshold)
+{
+    m_displayed_fraction_length = rounding_threshold;
+}