Carla/source/modules/juce_gui_basics/widgets/juce_ProgressBar.cpp

/*
  ==============================================================================

   This file is part of the JUCE 7 technical preview.
   Copyright (c) 2022 - Raw Material Software Limited

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For the technical preview this file cannot be licensed commercially.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

ProgressBar::ProgressBar (double& progress_)
   : progress (progress_),
     displayPercentage (true),
     lastCallbackTime (0)
{
    currentValue = jlimit (0.0, 1.0, progress);
}

ProgressBar::~ProgressBar()
{
}

//==============================================================================
void ProgressBar::setPercentageDisplay (const bool shouldDisplayPercentage)
{
    displayPercentage = shouldDisplayPercentage;
    repaint();
}

void ProgressBar::setTextToDisplay (const String& text)
{
    displayPercentage = false;
    displayedMessage = text;
}

void ProgressBar::lookAndFeelChanged()
{
    setOpaque (getLookAndFeel().isProgressBarOpaque (*this));
}

void ProgressBar::colourChanged()
{
    lookAndFeelChanged();
}

void ProgressBar::paint (Graphics& g)
{
    String text;

    if (displayPercentage)
    {
        if (currentValue >= 0 && currentValue <= 1.0)
            text << roundToInt (currentValue * 100.0) << '%';
    }
    else
    {
        text = displayedMessage;
    }

    getLookAndFeel().drawProgressBar (g, *this,
                                      getWidth(), getHeight(),
                                      currentValue, text);
}

void ProgressBar::visibilityChanged()
{
    if (isVisible())
        startTimer (30);
    else
        stopTimer();
}

void ProgressBar::timerCallback()
{
    double newProgress = progress;

    const uint32 now = Time::getMillisecondCounter();
    const int timeSinceLastCallback = (int) (now - lastCallbackTime);
    lastCallbackTime = now;

    if (currentValue != newProgress
         || newProgress < 0 || newProgress >= 1.0
         || currentMessage != displayedMessage)
    {
        if (currentValue < newProgress
             && newProgress >= 0 && newProgress < 1.0
             && currentValue >= 0 && currentValue < 1.0)
        {
            newProgress = jmin (currentValue + 0.0008 * timeSinceLastCallback,
                                newProgress);
        }

        currentValue = newProgress;
        currentMessage = displayedMessage;
        repaint();

        if (auto* handler = getAccessibilityHandler())
            handler->notifyAccessibilityEvent (AccessibilityEvent::valueChanged);
    }
}

//==============================================================================
std::unique_ptr<AccessibilityHandler> ProgressBar::createAccessibilityHandler()
{
    class ProgressBarAccessibilityHandler  : public AccessibilityHandler
    {
    public:
        explicit ProgressBarAccessibilityHandler (ProgressBar& progressBarToWrap)
            : AccessibilityHandler (progressBarToWrap,
                                    AccessibilityRole::progressBar,
                                    AccessibilityActions{},
                                    AccessibilityHandler::Interfaces { std::make_unique<ValueInterface> (progressBarToWrap) }),
              progressBar (progressBarToWrap)
        {
        }

        String getHelp() const override   { return progressBar.getTooltip(); }

    private:
        class ValueInterface  : public AccessibilityRangedNumericValueInterface
        {
        public:
            explicit ValueInterface (ProgressBar& progressBarToWrap)
                : progressBar (progressBarToWrap)
            {
            }

            bool isReadOnly() const override                { return true; }
            void setValue (double) override                 { jassertfalse; }
            double getCurrentValue() const override         { return progressBar.progress; }
            AccessibleValueRange getRange() const override  { return { { 0.0, 1.0 }, 0.001 }; }

        private:
            ProgressBar& progressBar;

            //==============================================================================
            JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ValueInterface)
        };

        ProgressBar& progressBar;

        //==============================================================================
        JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ProgressBarAccessibilityHandler)
    };

    return std::make_unique<ProgressBarAccessibilityHandler> (*this);
}

} // namespace juce