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179
userland/applications/calculator/ViewController.h
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179
userland/applications/calculator/ViewController.h
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#pragma once
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#include <libui/App.h>
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#include <libui/Button.h>
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#include <libui/Label.h>
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#include <libui/StackView.h>
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#include <libui/View.h>
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#include <libui/ViewController.h>
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#include <libui/Window.h>
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#include <memory>
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#include <sys/types.h>
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#include <sys/utsname.h>
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// TODO: Add enum for colors.
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class ViewController : public UI::ViewController<UI::View> {
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public:
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ViewController(UI::View& view)
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: UI::ViewController<UI::View>(view)
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{
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}
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virtual ~ViewController() = default;
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static constexpr const char* button_titles[20] = {
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"c",
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"+/-",
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"%",
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"/",
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"7",
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"8",
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"9",
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"*",
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"4",
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"5",
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"6",
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"-",
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"1",
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"2",
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"3",
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"+",
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"0",
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"00",
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",",
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"=",
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};
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constexpr size_t button_size() { return 48; }
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constexpr size_t spacing_size() { return 8; }
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bool is_operation(char a) { return a == '*' || a == '/' || a == '+' || a == '-'; }
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void on_button_click(UI::Button* sender)
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{
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// Check if it is a number
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if (sender->title().size() == 1 && '0' <= sender->title()[0] && sender->title()[0] <= '9') {
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m_current_number.push_back(sender->title()[0]);
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m_answer_label_ptr->set_text(m_current_number);
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return;
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}
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// Check if it is an operation
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if (sender->title().size() == 1 && is_operation(sender->title()[0])) {
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var_number1 = std::atoi(m_current_number.c_str());
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m_current_number.clear();
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m_operation = sender->title()[0];
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m_active_operation_button = sender;
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sender->set_background_color(LG::Color(165, 201, 242));
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return;
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}
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if (sender->title().size() == 1 && sender->title()[0] == '=') {
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int var_number2 = std::atoi(m_current_number.c_str());
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switch (m_operation) {
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case '+':
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var_number1 = var_number1 + var_number2;
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m_current_number = std::to_string(var_number1);
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m_answer_label_ptr->set_text(m_current_number);
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m_active_operation_button->set_background_color(LG::Color(231, 240, 250));
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break;
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case '-':
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var_number1 = var_number1 - var_number2;
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m_current_number = std::to_string(var_number1);
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m_answer_label_ptr->set_text(m_current_number);
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m_active_operation_button->set_background_color(LG::Color(231, 240, 250));
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break;
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case '*':
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var_number1 = var_number1 * var_number2;
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m_current_number = std::to_string(var_number1);
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m_answer_label_ptr->set_text(m_current_number);
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m_active_operation_button->set_background_color(LG::Color(231, 240, 250));
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break;
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case '/':
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m_active_operation_button->set_background_color(LG::Color(231, 240, 250));
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if (var_number2 == 0) {
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m_current_number = "";
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m_answer_label_ptr->set_text("Error");
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return;
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}
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var_number1 = var_number1 / var_number2;
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m_current_number = std::to_string(var_number1);
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m_answer_label_ptr->set_text(m_current_number);
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break;
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default:
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m_current_number = "";
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m_answer_label_ptr->set_text("Error");
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}
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return;
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}
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if (sender->title().size() == 1 && sender->title()[0] == 'c') {
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m_operation = ' ';
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m_active_operation_button = nullptr;
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m_answer_label_ptr->set_text("0");
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m_current_number.clear();
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return;
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}
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}
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void view_did_load() override
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{
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view().set_background_color(LG::Color::LightSystemBackground);
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auto& main_stackview = view().add_subview<UI::StackView>(LG::Rect(0, 0, 0, button_size() * 5 + spacing_size() * 4));
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main_stackview.set_background_color(LG::Color::LightSystemBackground);
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main_stackview.set_axis(UI::LayoutConstraints::Axis::Vertical);
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main_stackview.set_spacing(spacing_size());
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view().add_constraint(UI::Constraint(main_stackview, UI::Constraint::Attribute::Left, UI::Constraint::Relation::Equal, UI::SafeArea::Left));
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view().add_constraint(UI::Constraint(main_stackview, UI::Constraint::Attribute::Right, UI::Constraint::Relation::Equal, UI::SafeArea::Right));
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view().add_constraint(UI::Constraint(main_stackview, UI::Constraint::Attribute::Bottom, UI::Constraint::Relation::Equal, UI::SafeArea::Bottom));
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for (int i = 0; i < 5; i++) {
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auto& stackview = main_stackview.add_arranged_subview<UI::StackView>();
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stackview.set_background_color(LG::Color::LightSystemBackground);
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stackview.set_distribution(UI::StackView::Distribution::EqualSpacing);
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main_stackview.add_constraint(UI::Constraint(stackview, UI::Constraint::Attribute::Left, UI::Constraint::Relation::Equal, main_stackview, UI::Constraint::Attribute::Left, 1, 0));
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main_stackview.add_constraint(UI::Constraint(stackview, UI::Constraint::Attribute::Right, UI::Constraint::Relation::Equal, main_stackview, UI::Constraint::Attribute::Right, 1, 0));
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main_stackview.add_constraint(UI::Constraint(stackview, UI::Constraint::Attribute::Height, UI::Constraint::Relation::Equal, button_size()));
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for (int j = 0; j < 4; j++) {
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auto& view1 = stackview.add_arranged_subview<UI::Button>();
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if (j == 3 && i == 4) {
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view1.set_background_color(LG::Color(198, 166, 242));
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view1.set_title_color(LG::Color::White);
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} else if (j == 3 || i == 0) {
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view1.set_background_color(LG::Color(231, 240, 250));
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view1.set_title_color(LG::Color(35, 70, 106));
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} else {
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view1.set_background_color(LG::Color::LightSystemButton);
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view1.set_title_color(LG::Color::DarkSystemText);
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}
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view1.set_font(LG::Font::system_bold_font(14));
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view1.set_title(button_titles[i * 4 + j]);
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view1.set_alignment(UI::Text::Alignment::Center);
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view1.add_target([this](UI::View* sender) { this->on_button_click(static_cast<UI::Button*>(sender)); }, UI::Event::Type::MouseUpEvent);
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view1.layer().set_corner_mask(LG::CornerMask(button_size() / 2));
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stackview.add_constraint(UI::Constraint(view1, UI::Constraint::Attribute::Height, UI::Constraint::Relation::Equal, button_size()));
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stackview.add_constraint(UI::Constraint(view1, UI::Constraint::Attribute::Width, UI::Constraint::Relation::Equal, button_size()));
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}
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}
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auto& answer_label = view().add_subview<UI::Label>(LG::Rect(0, 0, 0, 40));
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answer_label.set_text("0");
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answer_label.set_text_color(LG::Color::DarkSystemText);
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answer_label.set_alignment(UI::Text::Alignment::Right);
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answer_label.set_font(LG::Font::system_font(36));
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m_answer_label_ptr = &answer_label;
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view().add_constraint(UI::Constraint(answer_label, UI::Constraint::Attribute::Left, UI::Constraint::Relation::Equal, UI::SafeArea::Left));
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view().add_constraint(UI::Constraint(answer_label, UI::Constraint::Attribute::Right, UI::Constraint::Relation::Equal, UI::SafeArea::Right));
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view().add_constraint(UI::Constraint(answer_label, UI::Constraint::Attribute::Bottom, UI::Constraint::Relation::Equal, main_stackview, UI::Constraint::Attribute::Top, 1, -8));
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view().set_needs_layout();
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}
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private:
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UI::Label* m_answer_label_ptr { nullptr };
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std::string m_current_number;
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int var_number1 { 0 };
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char m_operation;
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UI::Button* m_active_operation_button { nullptr };
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};
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