examples/7guis/flight_booker/src/main.cpp

Note

This Source File belongs to 7GUIs Flight Booker Example. Please follow the link for example explanation.

/*
 * AUI Framework - Declarative UI toolkit for modern C++20
 * Copyright (C) 2020-2025 Alex2772 and Contributors
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
 
#include <ctre.hpp>
#include <AUI/Platform/Entry.h>
#include <AUI/Platform/AWindow.h>
#include <AUI/Util/UIBuildingHelpers.h>
#include "AUI/View/ADropdownList.h"
#include "AUI/Model/AListModel.h"
#include "AUI/View/ATextField.h"
#include "AUI/Platform/AMessageBox.h"
 
using namespace declarative;
using namespace std::chrono;
 
constexpr auto REGEX_DATE = ctre::match<"([0-9]+)\\.([0-9]+)\\.([0-9]{4})">;
 
struct DateTextFieldState {
   AProperty<AOptional<system_clock::time_point>> parsed;
};
 
auto formatDate(system_clock::time_point date) {
   return "{0:%d}.{0:%m}.{0:%G}"_format(date);
}
 
auto dateTextField(DateTextFieldState& state) {
   return _new<ATextField>() let {
       AObject::biConnect(
           state.parsed.biProjected(aui::lambda_overloaded {
             [](const AOptional<system_clock::time_point>& v) -> AString {
                 if (!v) {
                     return "";
                 }
                 return formatDate(*v);
             },
             [](const AString& s) -> AOptional<system_clock::time_point> {
                 auto std = s.toStdString();
                 auto match = REGEX_DATE.match(std);
                 if (!match) {
                     return std::nullopt;
                 }
 
                 return sys_days(year_month_day(
                     year(std::stoi(match.get<3>().str())), month(std::stoi(match.get<2>().str())),
                     day(std::stoi(match.get<1>().str()))));
             },
           }),
           it->text());
       it & state.parsed > [](AView& textField, const AOptional<system_clock::time_point>& value) {
           textField.setAssName(".red", !value.hasValue());
       };
   };
}
 
class FlightBookerWindow : public AWindow {
public:
   FlightBookerWindow() : AWindow("AUI - 7GUIs - Book Flight", 150_dp, 50_dp) {
       setExtraStylesheet(AStylesheet { {
         ass::c(".red"),
         ass::BackgroundSolid { AColor::RED },
       } });
       setContents(Centered {
         Vertical {
           _new<ADropdownList>(AListModel<AString>::make({ "one-way flight", "return flight" })) let {
                   connect(it->selectionId().readProjected([](int selectionId) { return selectionId == 1; }),
                           mIsReturnFlight);
               },
           dateTextField(mDepartureDate),
           dateTextField(mReturnDate) let { connect(mIsReturnFlight, slot(it)::setEnabled); },
           _new<AButton>("Book") let {
                   connect(it->clicked, me::book);
                   connect(mIsValid, slot(it)::setEnabled);
               },
         },
       });
   }
 
private:
   DateTextFieldState mDepartureDate { system_clock::now() }, mReturnDate { system_clock::now() };
   AProperty<bool> mIsReturnFlight;
   APropertyPrecomputed<bool> mIsValid = [&] {
       if (!mDepartureDate.parsed->hasValue()) {
           return false;
       }
       if (!mIsReturnFlight) {
           return true;
       }
       if (!mReturnDate.parsed->hasValue()) {
           return false;
       }
       if (mDepartureDate.parsed->value() > mReturnDate.parsed->value()) {
           return false;
       }
       return true;
   };
 
   void book() {
       AString msg = "Departure - {}"_format(formatDate(mDepartureDate.parsed->value()));
       if (mIsReturnFlight) {
           msg += "\nReturn - {}"_format(formatDate(mReturnDate.parsed->value()));
       }
       AMessageBox::show(this, "You've booked the flight", msg);
   }
};
 
AUI_ENTRY {
   _new<FlightBookerWindow>()->show();
   return 0;
}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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