Calculator: Add a Shrinking action

This action allow the user to shrink a number to a finite number of
decimal.

7 files changed, 32 insertions, 7 deletions

diff --git a/Userland/Applications/Calculator/CalculatorWidget.cpp b/Userland/Applications/Calculator/CalculatorWidget.cpp
index 10717da2f1..4835797214 100644
--- a/Userland/Applications/Calculator/CalculatorWidget.cpp
+++ b/Userland/Applications/Calculator/CalculatorWidget.cpp
@@ -217,6 +217,12 @@ void CalculatorWidget::keydown_event(GUI::KeyEvent& event)
     update_display();
 }
 
+void CalculatorWidget::shrink(unsigned shrink_threshold)
+{
+    m_keypad.shrink(shrink_threshold);
+    update_display();
+}
+
 unsigned CalculatorWidget::rounding_length() const
 {
     return m_keypad.rounding_length();
diff --git a/Userland/Applications/Calculator/CalculatorWidget.h b/Userland/Applications/Calculator/CalculatorWidget.h
index b74242fc5f..556dadc22b 100644
--- a/Userland/Applications/Calculator/CalculatorWidget.h
+++ b/Userland/Applications/Calculator/CalculatorWidget.h
@@ -22,6 +22,7 @@ public:
     String get_entry();
     void set_entry(Crypto::BigFraction);
 
+    void shrink(unsigned);
     unsigned rounding_length() const;
     void set_rounding_length(unsigned);
 
diff --git a/Userland/Applications/Calculator/Keypad.cpp b/Userland/Applications/Calculator/Keypad.cpp
index 55b685e6fd..c261800043 100644
--- a/Userland/Applications/Calculator/Keypad.cpp
+++ b/Userland/Applications/Calculator/Keypad.cpp
@@ -145,3 +145,8 @@ unsigned Keypad::rounding_length() const
 {
     return m_displayed_fraction_length;
 }
+
+void Keypad::shrink(unsigned shrink_threshold)
+{
+    m_internal_value = m_internal_value.rounded(shrink_threshold);
+}
diff --git a/Userland/Applications/Calculator/Keypad.h b/Userland/Applications/Calculator/Keypad.h
index b658f5e540..ce57847284 100644
--- a/Userland/Applications/Calculator/Keypad.h
+++ b/Userland/Applications/Calculator/Keypad.h
@@ -29,6 +29,7 @@ public:
     void set_value(Crypto::BigFraction);
     void set_to_0();
 
+    void shrink(unsigned);
     void set_rounding_length(unsigned);
     unsigned rounding_length() const;
 
diff --git a/Userland/Applications/Calculator/RoundingDialog.cpp b/Userland/Applications/Calculator/RoundingDialog.cpp
index b968b42cd7..4492404f06 100644
--- a/Userland/Applications/Calculator/RoundingDialog.cpp
+++ b/Userland/Applications/Calculator/RoundingDialog.cpp
@@ -11,9 +11,9 @@
 #include <LibGUI/SpinBox.h>
 #include <LibGUI/TextEditor.h>
 
-RoundingDialog::ExecResult RoundingDialog::show(GUI::Window* parent_window, unsigned& rounding_value)
+RoundingDialog::ExecResult RoundingDialog::show(GUI::Window* parent_window, StringView title, unsigned& rounding_value)
 {
-    auto dialog = RoundingDialog::construct(parent_window);
+    auto dialog = RoundingDialog::construct(parent_window, title);
 
     if (parent_window) {
         dialog->set_icon(parent_window->icon());
@@ -32,12 +32,12 @@ RoundingDialog::ExecResult RoundingDialog::show(GUI::Window* parent_window, unsi
     return GUI::Dialog::ExecResult::OK;
 }
 
-RoundingDialog::RoundingDialog(GUI::Window* parent_window)
+RoundingDialog::RoundingDialog(GUI::Window* parent_window, StringView title)
     : Dialog(parent_window)
 {
     resize(m_dialog_length, m_dialog_height);
     set_resizable(false);
-    set_title("Choose custom rounding");
+    set_title(title);
 
     auto& main_widget = set_main_widget<GUI::Widget>();
 
diff --git a/Userland/Applications/Calculator/RoundingDialog.h b/Userland/Applications/Calculator/RoundingDialog.h
index 24fa8990c3..62828c5f03 100644
--- a/Userland/Applications/Calculator/RoundingDialog.h
+++ b/Userland/Applications/Calculator/RoundingDialog.h
@@ -13,10 +13,10 @@ class RoundingDialog : public GUI::Dialog {
     C_OBJECT(RoundingDialog);
 
 public:
-    static ExecResult show(GUI::Window* parent_window, unsigned& rounding_value);
+    static ExecResult show(GUI::Window* parent_window, StringView title, unsigned& rounding_value);
 
 private:
-    RoundingDialog(GUI::Window* parent_window);
+    RoundingDialog(GUI::Window* parent_window, StringView title);
     virtual ~RoundingDialog() override = default;
 
     RefPtr<GUI::SpinBox> m_rounding_spinbox;
diff --git a/Userland/Applications/Calculator/main.cpp b/Userland/Applications/Calculator/main.cpp
index 3a8750b338..4b6b7802e9 100644
--- a/Userland/Applications/Calculator/main.cpp
+++ b/Userland/Applications/Calculator/main.cpp
@@ -92,7 +92,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     auto round_custom = GUI::Action::create_checkable(String::formatted(format, 0), [&](auto& action) {
         unsigned custom_rounding_length = widget->rounding_length();
 
-        if (RoundingDialog::show(window, custom_rounding_length) == GUI::Dialog::ExecResult::OK) {
+        if (RoundingDialog::show(window, "Choose custom rounding"sv, custom_rounding_length) == GUI::Dialog::ExecResult::OK) {
             action.set_text(String::formatted(format, custom_rounding_length));
             widget->set_rounding_length(custom_rounding_length);
             last_rounding_mode.clear();
@@ -102,9 +102,21 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     widget->set_rounding_custom(round_custom, format);
 
+    auto shrink_action = GUI::Action::create("&Shrink...", TRY(Gfx::Bitmap::try_load_from_file("/res/icons/16x16/edit-cut.png"sv)), [&](auto&) {
+        unsigned shrink_length = widget->rounding_length();
+
+        if (RoundingDialog::show(window, "Choose shrinking length"sv, shrink_length) == GUI::Dialog::ExecResult::OK) {
+            round_custom->set_checked(true);
+            round_custom->set_text(String::formatted(format, shrink_length));
+            widget->set_rounding_length(shrink_length);
+            widget->shrink(shrink_length);
+        }
+    });
+
     preview_actions.add_action(*round_custom);
     preview_actions.set_exclusive(true);
     round_menu.add_action(*round_custom);
+    round_menu.add_action(*shrink_action);
 
     round_menu.action_at(last_rounding_mode.value())->activate();