Calculator: Add a simple calculator app

Closes https://github.com/SerenityOS/serenity/issues/319

1 files changed, 198 insertions, 0 deletions

diff --git a/Applications/Calculator/CalculatorWidget.cpp b/Applications/Calculator/CalculatorWidget.cpp
new file mode 100644
index 0000000000..38070cbe07
--- /dev/null
+++ b/Applications/Calculator/CalculatorWidget.cpp
@@ -0,0 +1,198 @@
+#include "CalculatorWidget.h"
+#include <AK/Assertions.h>
+#include <LibGUI/GButton.h>
+#include <LibGUI/GLabel.h>
+#include <LibGUI/GTextBox.h>
+
+CalculatorWidget::CalculatorWidget(GWidget* parent)
+    : GWidget(parent)
+{
+    set_fill_with_background_color(true);
+
+    m_entry = new GTextBox(this);
+    m_entry->set_relative_rect(5, 5, 244, 26);
+    m_entry->set_text_alignment(TextAlignment::CenterRight);
+
+    m_label = new GLabel(this);
+    m_label->set_relative_rect(12, 42, 27, 27);
+    m_label->set_foreground_color(Color::NamedColor::Red);
+    m_label->set_frame_shadow(FrameShadow::Sunken);
+    m_label->set_frame_shape(FrameShape::Container);
+    m_label->set_frame_thickness(2);
+
+    update_display();
+
+    for (int i = 0; i < 10; i++) {
+        auto& button = *new GButton(this);
+        int p = i ? i + 2 : 0;
+        int x = 55 + (p % 3) * 39;
+        int y = 177 - (p / 3) * 33;
+        button.move_to(x, y);
+        button.set_foreground_color(Color::NamedColor::Blue);
+        add_button(button, i);
+    }
+
+    auto& button_mem_add = *new GButton(this);
+    button_mem_add.move_to(9, 177);
+    button_mem_add.set_foreground_color(Color::NamedColor::Red);
+    button_mem_add.set_text("M+");
+    add_button(button_mem_add, Calculator::Operation::MemAdd);
+
+    auto& button_mem_save = *new GButton(this);
+    button_mem_save.move_to(9, 144);
+    button_mem_save.set_foreground_color(Color::NamedColor::Red);
+    button_mem_save.set_text("MS");
+    add_button(button_mem_save, Calculator::Operation::MemSave);
+
+    auto& button_mem_recall = *new GButton(this);
+    button_mem_recall.move_to(9, 111);
+    button_mem_recall.set_foreground_color(Color::NamedColor::Red);
+    button_mem_recall.set_text("MR");
+    add_button(button_mem_recall, Calculator::Operation::MemRecall);
+
+    auto& button_mem_clear = *new GButton(this);
+    button_mem_clear.move_to(9, 78);
+    button_mem_clear.set_foreground_color(Color::NamedColor::Red);
+    button_mem_clear.set_text("MC");
+    add_button(button_mem_clear, Calculator::Operation::MemClear);
+
+    auto& button_clear = *new GButton(this);
+    button_clear.set_foreground_color(Color::NamedColor::Red);
+    button_clear.set_text("C");
+    button_clear.on_click = [this](GButton&) {
+        m_keypad.set_value(0.0);
+        m_calculator.clear_operation();
+        update_display();
+    };
+    add_button(button_clear);
+    button_clear.set_relative_rect(187, 40, 60, 28);
+
+    auto& button_clear_error = *new GButton(this);
+    button_clear_error.set_foreground_color(Color::NamedColor::Red);
+    button_clear_error.set_text("CE");
+    button_clear_error.on_click = [this](GButton&) {
+        m_calculator.clear_error();
+        update_display();
+    };
+    add_button(button_clear_error);
+    button_clear_error.set_relative_rect(124, 40, 59, 28);
+
+    auto& button_backspace = *new GButton(this);
+    button_backspace.set_foreground_color(Color::NamedColor::Red);
+    button_backspace.set_text("Backspace");
+    button_backspace.on_click = [this](GButton&) {
+        m_keypad.type_backspace();
+        update_display();
+    };
+    add_button(button_backspace);
+    button_backspace.set_relative_rect(55, 40, 65, 28);
+
+    auto& button_decimal_point = *new GButton(this);
+    button_decimal_point.move_to(133, 177);
+    button_decimal_point.set_foreground_color(Color::NamedColor::Blue);
+    button_decimal_point.set_text(".");
+    button_decimal_point.on_click = [this](GButton&) {
+        m_keypad.type_decimal_point();
+        update_display();
+    };
+    add_button(button_decimal_point);
+
+    auto& button_toggle_sign = *new GButton(this);
+    button_toggle_sign.move_to(94, 177);
+    button_toggle_sign.set_foreground_color(Color::NamedColor::Blue);
+    button_toggle_sign.set_text("+/-");
+    add_button(button_toggle_sign, Calculator::Operation::ToggleSign);
+
+    auto& button_add = *new GButton(this);
+    button_add.move_to(172, 177);
+    button_add.set_foreground_color(Color::NamedColor::Red);
+    button_add.set_text("+");
+    add_button(button_add, Calculator::Operation::Add);
+
+    auto& button_subtract = *new GButton(this);
+    button_subtract.move_to(172, 144);
+    button_subtract.set_foreground_color(Color::NamedColor::Red);
+    button_subtract.set_text("-");
+    add_button(button_subtract, Calculator::Operation::Subtract);
+
+    auto& button_multiply = *new GButton(this);
+    button_multiply.move_to(172, 111);
+    button_multiply.set_foreground_color(Color::NamedColor::Red);
+    button_multiply.set_text("*");
+    add_button(button_multiply, Calculator::Operation::Multiply);
+
+    auto& button_divide = *new GButton(this);
+    button_divide.move_to(172, 78);
+    button_divide.set_foreground_color(Color::NamedColor::Red);
+    button_divide.set_text("/");
+    add_button(button_divide, Calculator::Operation::Divide);
+
+    auto& button_sqrt = *new GButton(this);
+    button_sqrt.move_to(211, 78);
+    button_sqrt.set_foreground_color(Color::NamedColor::Blue);
+    button_sqrt.set_text("sqrt");
+    add_button(button_sqrt, Calculator::Operation::Sqrt);
+
+    auto& button_inverse = *new GButton(this);
+    button_inverse.move_to(211, 144);
+    button_inverse.set_foreground_color(Color::NamedColor::Blue);
+    button_inverse.set_text("1/x");
+    add_button(button_inverse, Calculator::Operation::Inverse);
+
+    auto& button_percent = *new GButton(this);
+    button_percent.move_to(211, 111);
+    button_percent.set_foreground_color(Color::NamedColor::Blue);
+    button_percent.set_text("%");
+    add_button(button_percent, Calculator::Operation::Percent);
+
+    auto& button_equals = *new GButton(this);
+    button_equals.move_to(211, 177);
+    button_equals.set_foreground_color(Color::NamedColor::Red);
+    button_equals.set_text("=");
+    button_equals.on_click = [this](GButton&) {
+        double argument = m_keypad.value();
+        double res = m_calculator.finish_operation(argument);
+        m_keypad.set_value(res);
+        update_display();
+    };
+    add_button(button_equals);
+}
+
+CalculatorWidget::~CalculatorWidget()
+{
+}
+
+void CalculatorWidget::add_button(GButton& button, Calculator::Operation operation)
+{
+    add_button(button);
+    button.on_click = [this, operation](GButton&) {
+        double argument = m_keypad.value();
+        double res = m_calculator.begin_operation(operation, argument);
+        m_keypad.set_value(res);
+        update_display();
+    };
+}
+
+void CalculatorWidget::add_button(GButton& button, int digit)
+{
+    add_button(button);
+    button.set_text(String::number(digit));
+    button.on_click = [this, digit](GButton&) {
+        m_keypad.type_digit(digit);
+        update_display();
+    };
+}
+
+void CalculatorWidget::add_button(GButton& button)
+{
+    button.resize(35, 28);
+}
+
+void CalculatorWidget::update_display()
+{
+    m_entry->set_text(m_keypad.to_string());
+    if (m_calculator.has_error())
+        m_label->set_text("E");
+    else
+        m_label->set_text("");
+}