JUCE/modules/juce_gui_basics/windows/juce_ThreadWithProgressWindow.cpp

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

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2020 - Raw Material Software Limited

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

   For this technical preview, this file is not subject to commercial licensing.

   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
{

ThreadWithProgressWindow::ThreadWithProgressWindow (const String& title,
                                                    const bool hasProgressBar,
                                                    const bool hasCancelButton,
                                                    const int cancellingTimeOutMs,
                                                    const String& cancelButtonText,
                                                    Component* componentToCentreAround)
   : Thread ("ThreadWithProgressWindow"),
     progress (0.0),
     timeOutMsWhenCancelling (cancellingTimeOutMs),
     wasCancelledByUser (false)
{
    alertWindow.reset (LookAndFeel::getDefaultLookAndFeel()
                           .createAlertWindow (title, {},
                                               cancelButtonText.isEmpty() ? TRANS("Cancel")
                                                                          : cancelButtonText,
                                               {}, {}, AlertWindow::NoIcon, hasCancelButton ? 1 : 0,
                                               componentToCentreAround));

    // if there are no buttons, we won't allow the user to interrupt the thread.
    alertWindow->setEscapeKeyCancels (false);

    if (hasProgressBar)
        alertWindow->addProgressBarComponent (progress);
}

ThreadWithProgressWindow::~ThreadWithProgressWindow()
{
    stopThread (timeOutMsWhenCancelling);
}

void ThreadWithProgressWindow::launchThread (int priority)
{
    JUCE_ASSERT_MESSAGE_THREAD

    startThread (priority);
    startTimer (100);

    {
        const ScopedLock sl (messageLock);
        alertWindow->setMessage (message);
    }

    alertWindow->enterModalState();
}

void ThreadWithProgressWindow::setProgress (const double newProgress)
{
    progress = newProgress;
}

void ThreadWithProgressWindow::setStatusMessage (const String& newStatusMessage)
{
    const ScopedLock sl (messageLock);
    message = newStatusMessage;
}

void ThreadWithProgressWindow::timerCallback()
{
    bool threadStillRunning = isThreadRunning();

    if (! (threadStillRunning && alertWindow->isCurrentlyModal (false)))
    {
        stopTimer();
        stopThread (timeOutMsWhenCancelling);
        alertWindow->exitModalState (1);
        alertWindow->setVisible (false);

        wasCancelledByUser = threadStillRunning;
        threadComplete (threadStillRunning);
        return; // (this may be deleted now)
    }

    const ScopedLock sl (messageLock);
    alertWindow->setMessage (message);
}

void ThreadWithProgressWindow::threadComplete (bool) {}

#if JUCE_MODAL_LOOPS_PERMITTED
bool ThreadWithProgressWindow::runThread (const int priority)
{
    launchThread (priority);

    while (isTimerRunning())
        MessageManager::getInstance()->runDispatchLoopUntil (5);

    return ! wasCancelledByUser;
}
#endif

} // namespace juce