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

Note

This Source File belongs to 7GUIs Timer 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 <AUI/Platform/Entry.h>
#include <AUI/Platform/AWindow.h>
#include <AUI/Util/UIBuildingHelpers.h>
#include "AUI/View/AProgressBar.h"
#include "AUI/View/ASlider.h"
#include "AUI/View/AButton.h"
 
using namespace declarative;
 
using namespace std::chrono;
using namespace std::chrono_literals;
 
static constexpr high_resolution_clock::duration MAX_DURATION = 60s;
 
class TimerWindow : public AWindow {
public:
   TimerWindow() : AWindow("AUI - 7GUIs - Timer", 300_dp, 50_dp) {
       setContents(Centered {
         Vertical::Expanding {
           Horizontal {
             Label { "Elapsed Time:" },
             Centered::Expanding {
               _new<AProgressBar>() let {
                       it & mElapsedTimeRatio;
                       it->setCustomStyle({ Expanding { 1, 0 } });
                   },
             },
           },
           Label {} & mElapsedTime.readProjected([](high_resolution_clock::duration d) {
               return "{:.1f}s"_format(duration_cast<milliseconds>(d).count() / 1000.f);
           }),
           Horizontal {
             Label { "Duration:" },
             _new<ASlider>() let {
                     it&& mDuration.biProjected(aui::lambda_overloaded {
                       [](high_resolution_clock::duration d) -> aui::float_within_0_1 {
                           return float(d.count()) / float(MAX_DURATION.count());
                       },
                       [](aui::float_within_0_1 d) -> high_resolution_clock::duration {
                           return high_resolution_clock::duration(long(float(d) * float(MAX_DURATION.count())));
                       },
                     });
                     it->setCustomStyle({ Expanding {} });
                 },
           },
           _new<AButton>("Reset Timer") with_style {
                 Expanding { 1, 0 },
               } let { connect(it->clicked, me::reset); },
         },
       });
 
       connect(mTimer->fired, me::update);
       mTimer->start();
   }
 
private:
   _<ATimer> mTimer = _new<ATimer>(100ms);
   high_resolution_clock::time_point mStartTime = high_resolution_clock::now();
   AProperty<high_resolution_clock::time_point> mCurrentTime;
   AProperty<high_resolution_clock::duration> mDuration = 30s;
 
   APropertyPrecomputed<high_resolution_clock::duration> mElapsedTime = [&] {
       return std::min(mCurrentTime - mStartTime, *mDuration);
   };
 
   APropertyPrecomputed<aui::float_within_0_1> mElapsedTimeRatio = [&] {
       return float(mElapsedTime->count()) / float(mDuration->count());
   };
 
   void update() { mCurrentTime = high_resolution_clock::now(); }
 
   void reset() { mStartTime = high_resolution_clock::now(); }
};
 
AUI_ENTRY {
   _new<TimerWindow>()->show();
   return 0;
}

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